BTS5241-2L
Smart High-Side Power Switch
PROFET
Data Sheet, Rev. 1.4, Mai 2008
Automotive Power
Data Sheet 2 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
1Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Pin Assignment BTS5241-2L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Block Description and Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Power Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.1 Output On-State Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.2 Input Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.3 Inductive Output Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1.4 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Protection Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.1 Over-Load Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.2 Reverse Polarity Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.3 Overvoltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.4 Loss of Ground Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.5 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3 Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3.1 ON-State Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.2 OFF-State Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.3 Sense Enable Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.4 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5 Package Outlines BTS5241-2L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table of Contents
PG-DSO-12-9
Type Package Marking
BTS5241-2L PG-DSO-12-9 BTS5241-2L
Data Sheet 3 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
PROFET
BTS5241-2L
Overview
Basic Features
• Very low standby current
• 3.3 V and 5 V compatible logic pins
• Improved Electromagnetic Compatibility (EMC)
• Stable behavior at Undervoltage
• Logic ground independent from load ground
• Secure load turn-off while logic ground disconnected
• Optimized inverse current capability
• Green Product (RoHS compliant)
•AEC Qualified
Description
The BTS5241-2L is a dual channel high-side power switch (two times 25 mΩ) in PG-DSO-12-9 power package
providing embedded protective functions.
The Enhanced IntelliSense pins IS1 and IS2 provide a sophisticated diagnostic feedback signal including current
sense function and open load in off state. The diagnosis signals can be switched on and off by the sense enable
pin SEN.
An integrated ground resistor as well as integrated resistors at each input pin (IN1, IN2, SEN) reduce external
components to a minimum.
The power transistor is built by a N-channel vertical power MOSFET with charge pump. The inputs are ground
referenced CMOS compatible. The device is monolithically integrated in Smart SIPMOS technology.
Product Summary
Operating voltage Vbb(on) 4.5..28V
Overvoltage protection Vbb(AZ) 41 V
On-State resistance (Tj = 150 °C) RDS(ON) 50 mΩ
Nominal load current (one channel active) IL(nom) 5.7 A
Current limitation IL(LIM) 40 A
Current limitation repetitive IL(SCr) 9.5 A
Stand-by current for whole device with load Ibb(OFF) 7.5 µA
Smart High-Side Power Switch
BTS5241-2L
Data Sheet 4 Rev. 1.4, 2008-05-05
Protective Functions
• Reverse battery protection without external components
• Short circuit protection
• Over-load protection
• Multi-step current limitation
• Thermal shutdown with restart
• Thermal restart at reduced current limitation
• Overvoltage protection without external resistor
• Loss of ground protection
• Electrostatic discharge protection (ESD)
Diagnostic Functions
• Enable function for diagnosis pins (IS1 and IS2)
• Proportional load current sense signal by current source
• Open load detection in ON-state by load current sense
• Open load detection in OFF-state by voltage source
• Feedback on Overtemperature and current limitation in ON-state
Applications
• µC compatible high-side power switch with diagnostic feedback for 12 V grounded loads
• All types of resistive, inductive and capacitive loads
• Most suitable for loads with high inrush currents, so as lamps
• Replaces electromechanical relays, fuses and discrete circuits
Data Sheet 5 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
Block DiagramTerms
1 Block Diagram
Figure 1 Block Diagram
1.1 Terms
Following figure shows all terms used in this data sheet.
Figure 2 Terms
Channel related symbols without channel number are valid for each channel separately.
channel 1
internal
power
supply
ESD
protection
OUT2
channel 2
control and protection circuit
equivalent to
channel 1
IN1
IS1
SEN
GND
R
GND
IS2
IN2
logic
gate control
&
charge pump
VBB
OUT1multi step
load current
limitation
load current
sense
open load
detection
temperature
sensor
clamp for
inductive
load
Terms2ch.emf
I
IN1
V
IN1
OUT1
I
IN2
V
IN2
V
IS1
I
IS1
V
IS2
I
IS2
V
bb
V
SEN
I
SEN
I
L1
V
OUT2
V
OUT1
V
DS2
V
DS1
I
L2
GND
I
GND
I
bb
IN1
IN2
IS1
IS2
SEN
VBB
OUT2
BTS5241-2L
Smart High-Side Power Switch
BTS5241-2L
Pin ConfigurationPin Assignment BTS5241-2L
Data Sheet 6 Rev. 1.4, 2008-05-05
2 Pin Configuration
2.1 Pin Assignment BTS5241-2L
Figure 3 Pin Configuration PG-DSO-12-9
2.2 Pin Definitions and Functions
Pin Symbol I/O Function
2 IN1 I Input signal for channel 1
5 IN2 I Input signal for channel 2
3 IS1 O Diagnosis output signal channel 1
4 IS2 O Diagnosis output signal channel 2
7 SEN I Sense Enable input for channel 1&2
10,11 OUT1 O Protected high-side power output channel 11)
1) All output pins of a channel have to be connected together on the PCB. PCB traces have to be designed to withstand the
maximum current which can flow
8, 9 OUT2 O Protected high-side power output channel 21)
1 GND – Ground connection
6,12,
heat slug
VBB – Positive power supply for logic supply as well as output power supply
(top view)
OUT1
OUT1
OUT2
OUT2
VBB
SEN
12
11
10
9
8
7
IN1
IS1
IS2
IN2
GND
VBB
1
2
3
4
5
6
heat slug (VBB)
Data Sheet 7 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
Electrical CharacteristicsMaximum Ratings
3 Electrical Characteristics
3.1 Maximum Ratings
Stresses above the ones listed here may cause permanent damage to the device. Exposure to maximum rating
conditions for extended periods may affect device reliability.
Tj = 25 °C (unless otherwise specified)
Pos. Parameter Symbol Limit Values Unit Test Conditions
min. max.
Supply Voltage
3.1.1 Supply voltage Vbb -16 28 V
3.1.2 Supply voltage for short circuit protection (single
pulse)
(Tj = -40°C .. 150°C)
Vbb(SC) 028VL = 8 µH
R = 0.2 Ω 1)
3.1.3 Voltage at power transistor VDS –52V
3.1.4 Supply Voltage for Load Dump protection Vbb(LD) –53VRI = 2 Ω 2)
RL = 6.8 Ω
Power Stages
3.1.5 Load current IL–IL(LIM) A3)
3.1.6 Maximum energy dissipation per channel
(single pulse)
EAS –0.13J
4)
IL(0) = 5.5 A
Tj(0) = 150°C
Vbb=12V
3.1.7 Total power dissipation (DC) for whole device Ptot –2.0 W
5)
Ta = 85 °C
Tj ≤150 °C
Logic Pins
3.1.8 Voltage at input pin VIN -5
-16
19 V
t ≤2min.
3.1.9 Current through input pin IIN -2.0
-8.0
2.0 mA
t ≤2min.
3.1.10 Voltage at sense enable pin VSEN -5
-16
19 V
t ≤2min.
3.1.11 Current through sense enable pin ISEN -2.0
-8.0
2.0 mA
t ≤2min.
3.1.12 Current through sense pin IIS -25 10 mA
Temperatures
3.1.13 Junction temperature Tj-40 150 °C
3.1.14 Dynamic temperature increase while switching ∆Tj–60°C
3.1.15 Storage temperature Tstg -55 150 °C
ESD Susceptibility
3.1.16 ESD susceptibility HBM
IN, SEN
IS
OUT
VESD
-1
-2
-4
1
2
4
kV according to
EIA/JESD 22-A
114B
Smart High-Side Power Switch
BTS5241-2L
Electrical CharacteristicsMaximum Ratings
Data Sheet 8 Rev. 1.4, 2008-05-05
1) R and L describe the complete circuit impedance including line, contact and generator impedances
2) Load Dump is specified in ISO 7637, RI is the internal resistance of the Load Dump pulse generator
3) Current limitation is a protection feature. Operation in current limitation is considered as “outside” normal operating range.
Protection features are not designed for continuous repetitive operation.
4) Pulse shape represents inductive switch off: IL(t) = IL(0) * (1 - t /tpeak); 0 < t < tpeak
5) Device mounted on PCB (50 mm x 50 mm x 1.5mm epoxy, FR4) with 6 cm2 copper heatsinking area (one layer, 70 µm
thick) for Vbb connection. PCB is vertical without blown air.
Data Sheet 9 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
Block Description and Electrical CharacteristicsPower Stages
4 Block Description and Electrical Characteristics
4.1 Power Stages
The power stages are built by a N-channel vertical power MOSFET (DMOS) with charge pump.
4.1.1 Output On-State Resistance
The On-state resistance RDS(ON) depends on the supply voltage as well as the junction temperature Tj. Figure 4
shows these dependencies for the typical On-state resistance. The On-state resistance in reverse polarity mode
is described in Section 4.2.2.
Figure 4 Typical On-State Resistance
4.1.2 Input Circuit
Figure 5 shows the input circuit of the BTS5241-2L. There is an integrated input resistor that makes external
components obsolete. The current source to ground ensures that the device switches off in case of open input pin.
The zener diode protects the input circuit against ESD pulses.
Figure 5 Input Circuit (IN1 and IN2)
A high signal at the input pin causes the power DMOS to switch on with a dedicated slope, which is optimized in
terms of EMC emission.
Figure 6 Switching a Load (resistive)
10
15
20
25
30
35
-50 -25 0 25 50 75 100 125 150
RDS(ON) /mΩ
T /°C
20
40
60
80
100
120
140
0 5 10 15 20 25
RDS(ON) /mΩ
V
bb
/V
Vbb = Tj =
IN R
IN
I
IN
GND
R
GND
I nput . emf
internal ground
IN
V
OUT
t
SwitchOn.emf
t
ON
t
OFF
t
90%
10%
70%
dV/
dt
ON
30%
70%
dV/
dt
OFF
30%
Smart High-Side Power Switch
BTS5241-2L
Block Description and Electrical CharacteristicsPower Stages
Data Sheet 10 Rev. 1.4, 2008-05-05
4.1.3 Inductive Output Clamp
When switching off inductive loads with high-side switches, the potential at pin OUT drops below ground potential,
because the inductance intends to continue driving the current.
Figure 7 Output Clamp (OUT1 and OUT2)
To prevent destruction of the device, there is a voltage clamp mechanism implemented that keeps that negative
output voltage at a certain level (VOUT(CL)). See Figure 7 and Figure 8 for details. Nevertheless, the maximum
allowed load inductance is limited.
Figure 8 Switching an Inductance
Maximum Load Inductance
While demagnetization of inductive loads, energy has to be dissipated in the BTS5241-2L. This energy can be
calculated with following equation:
Following equation simplifies under the assumption of RL = 0:
The energy, which is converted into heat, is limited by the thermal design of the component. See Figure 9 for the
maximum allowed energy dissipation.
Output Clam p . em f
OUT
GND
V
bb
VBB
L,
R
L
V
OUT
I
L
V
OUT
I nduct iveLoad. em f
t
I
L
t
V
OUT(CL)
V
bb
IN = 5V IN = 0V
EV
bb VOUT(CL)
+()
VOUT(CL)
–
RL
-----------------------------ln⋅1RLIL
⋅
VOUT(CL)
-------------------------+
IL
+L
RL
-------
⋅⋅=
E1
2
---LIL
21Vbb
VOUT(CL)
-------------------------+
⋅=
Data Sheet 11 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
Block Description and Electrical CharacteristicsPower Stages
Figure 9 Maximum energy dissipation single pulse, Tj,Start = 150°C; VBB = 12V
100
1000
10000
0246810
I
L
(A)
E
AS
(mJ)
EAS.vsd
Smart High-Side Power Switch
BTS5241-2L
Block Description and Electrical CharacteristicsPower Stages
Data Sheet 12 Rev. 1.4, 2008-05-05
4.1.4 Electrical Characteristics
Vbb = 9 V to 16 V, Tj = -40 °C to +150 °C (unless otherwise specified)
typical values: Vbb = 13.5 V, Tj = 25 °C
Pos. Parameter Symbol Limit Values Unit Test Conditions
min. typ. max.
General
4.1.1 Operating voltage Vbb 4.5 – 28 V VIN = 4.5 V
RL = 12 Ω
VDS < 0.5 V
4.1.2 Operating current
one channel
all channels
IGND
–
–
1.5
2.8
4
8
mA VIN = 5 V
4.1.3 Stand-by current for whole device with
load
Ibb(OFF)
–
–
–
5
–
–
7.5
7.5
19
µA VIN = 0 V
VSEN = 0 V
VOUT < VOUT(OL)
Tj = 25°C
Tj = 105°C 1)
Tj = 150°C
Output characteristics
4.1.4 On-State resistance per channel RDS(ON)
–
–
19
35
25
48
mΩIL = 5 A
Tj = 25 °C
Tj = 150 °C
4.1.5 Output voltage drop limitation at small
load currents
VDS(NL) –40–mVIL < 0.5 A
4.1.6 Nominal load current per channel
one channel active
two channels active
IL(nom)
5.7
4.4
–
–
–
–
ATa = 85 °C
Tj ≤150 °C 2) 3)
ISO load current per channel
one channel active
two channels active
IL(ISO)
12.7
12.7
–
–
–
–
ATc = 85 °C
VDS = 0.5 V 3)
4.1.7 Output clamp VOUT(CL) -24 -20 -17 V IL = 40 mA
4.1.8 Output leakage current per channel IL(OFF) –1.58µAVIN = 0 V
4.1.9 Inverse current capability -IL(inv) –3–A
1)
Thermal Resistance
4.1.10 Junction to case Rthjc --2.2K/W
4.1.11 Junction to ambient
one channel active
all channels active
Rthja -
-
40
33
-
-
2)
Input characteristics
4.1.12 Input resistance RIN 2.3 3.6 5.3 kΩ
4.1.13 L-input level VIN(L) -0.3 1.0 V
4.1.14 H-input level VIN(H) 2.6 17 V
4.1.15 Input hysteresis
∆
VIN 0.4 V 1)
4.1.16 L-input current IIN(L) 375µAVIN = 0.4 V
4.1.17 H-input current IIN(H) 10 38 75 µA VIN = 5 V
Data Sheet 13 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
Block Description and Electrical CharacteristicsPower Stages
Note: Characteristics show the deviation of parameter at the given supply voltage and junction temperature.
Typical values show the typical parameters expected from manufacturing.
Note: This thermal data was generated in accordance with JEDEC JESD51 standards. For more information, go
to www.jedec.org.
Timings
4.1.18 Turn-on time to
90% Vbb
tON 120 250 µs RL = 12 Ω
Vbb = 13.5 V
4.1.19 Turn-off time to
10% Vbb
tOFF 135 250 µs RL = 12 Ω
Vbb = 13.5 V
4.1.20 slew rate
30% to 70% Vbb
dV/ dtON 0.1 0.25 0.5 V/µs RL = 12 Ω
Vbb = 13.5 V
4.1.21 slew rate
70% to 30% Vbb
-dV/ dtOFF 0.1 0.25 0.5 V/µs RL = 12 Ω
Vbb = 13.5 V
1) Not subject to production test, specified by design
2) Device mounted on PCB (50 mm x 50 mm x 1.5mm epoxy, FR4) with 6 cm2 copper heatsinking area (one layer, 70 µm
thick) for Vbb connection. PCB is vertical without blown air.
3) Not subject to production test, parameters are calculated from RDS(ON) and Rth
Vbb = 9 V to 16 V, Tj = -40 °C to +150 °C (unless otherwise specified)
typical values: Vbb = 13.5 V, Tj = 25 °C
Pos. Parameter Symbol Limit Values Unit Test Conditions
min. typ. max.
Smart High-Side Power Switch
BTS5241-2L
Protection Functions
Data Sheet 14 Rev. 1.4, 2008-05-05
4.2 Protection Functions
The device provides embedded protective functions. Integrated protection functions are designed to prevent IC
destruction under fault conditions described in the data sheet. Fault conditions are considered as “outside” normal
operating range. Protection functions are neither designed for continuous nor repetitive operation.
4.2.1 Over-Load Protection
The load current IOUT is limited by the device itself in case of over-load or short circuit to ground. There are two
steps of current limitation which are selected automatically depending on the voltage VDS across the power DMOS.
Please note that the voltage at the OUT pin is Vbb -VDS. Please refer to the following figure for details.
Figure 10 Current Limitation (minimum values)
Current limitation is realized by increasing the resistance of the device which leads to rapid temperature rise inside.
A temperature sensor for each channel causes an over-heated channel to switch off to prevent destruction. After
cooling down with thermal hysteresis, the channel switches on again. Please refer to Figure 11 for details.
Figure 11 Shut Down by Overtemperature
In short circuit condition, the load current is initially limited to IL(LIM). After thermal restart, the current limitation level
is reduced to IL(SCr). The current limitation level is reset to IL(LIM) by switching off the device (VIN = 0 V).
4.2.2 Reverse Polarity Protection
The reverse current through the power transistors has to be limited by the connected loads. Additional power is
dissipated by the integrated ground resistor. The current trough sense pins IS1 and IS2 has to be limited (please
refer to maximum ratings on Page 7). The temperature protection is not active during reverse polarity.
4.2.3 Overvoltage Protection
In addition to the output clamp for inductive loads as described in Section 4.1.3, there is a clamp mechanism for
overvoltage protection. Because of the integrated ground resistor, overvoltage protection does not require external
components.
As shown in Figure 12, in case of supply voltages greater than Vbb(AZ), the power transistors switch on, and the
voltage across logic part is clamped. As a result, the internal ground potential rises to Vbb - Vbb(AZ). Due to the ESD
zener diodes, the potential at pin IN1, IN2 and SEN rises almost to that potential, depending on the impedance of
the connected circuitry.
I
L
Cur rent Lim it at ion. emf
V
DS
5 1015202530
10
20
30
40
IN
I
L
I
IS
t
I
L(LIM)
I
L(SCr)
t
t
Over Load . emf
t
OFF( SC)
Data Sheet 15 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
Protection Functions
Figure 12 Overvoltage Protection
4.2.4 Loss of Ground Protection
In case of complete loss of the device ground connections, but connected load ground, the BTS5241-2L securely
changes to or keeps in off state.
OUT
VBB
Ov erV olt age . em f
V
OUT
R
GND
logic
GND
IN
IS
SEN R
SEN
R
IN
ZD
ESD
ZD
AZ
internal ground
Smart High-Side Power Switch
BTS5241-2L
Protection Functions
Data Sheet 16 Rev. 1.4, 2008-05-05
4.2.5 Electrical Characteristics
Vbb = 9 V to 16 V, Tj = -40 °C to +150 °C (unless otherwise specified)
typical values: Vbb = 13.5 V, Tj = 25 °C
Pos. Parameter Symbol Limit Values Unit Test Conditions
min. typ. max.
Over-Load Protection
4.2.1 Load current limitation IL(LIM) 40 – 55 A
4.2.2 Repetitive short circuit current limitation IL(SCr) –9.5–ATj = Tj(SC)
1)
1) Not subject to production test, specified by design
4.2.3 Initial short circuit shut down time tOFF(SC) –0.7–msTjStart = 25 °C 1)
4.2.4 Thermal shut down temperature Tj(SC) 150 1701) –°C
4.2.5 Thermal hysteresis ∆Tj–7–K
1)
Reverse Battery
4.2.6
Drain source voltage during reverse polarity
-VDS(REV) – – 800 mV IL = -3.5 A
4.2.7
Reverse current through GND pin
-IGND –70–mAVbb = -13.5 V
1)
Ground Circuit
4.2.8 Integrated Resistor in GND line RGND 120 175 260 Ω–
Overvoltage
4.2.9 Overvoltage protection Vbb(AZ) 41 47 53 V Ibb = 150µA
Loss of GND
4.2.10 Output current while GND disconnected IL(GND) ––1mAIIN = 0 1) 2)
ISEN = 0
IGND = 0
IIS = 0
2) no connection at these pins
Data Sheet 17 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
Diagnosis
4.3 Diagnosis
For diagnosis purpose, the BTS5241-2L provides an Enhanced IntelliSense signal at pins IS1 and IS2 that is
enabled by pin SEN. The current sense signal IIS, a proportional signal to the load current (ratio kILIS = IL / IIS), is
provided as long as no failure mode occurs. In case of open load in OFF-state, the voltage VIS(fault) is fed to the
diagnosis pin.
Figure 13 Block Diagram: Diagnosis
Table 1 Truth Table
Operation Mode Input
Level
Output Level Diagnostic Output
SEN = H SEN = L
Normal Operation (OFF) L Z Z Z
Short Circuit to GND GND Z Z
Overtemperature Z Z Z
Short Circuit to Vbb Vbb VIS =VIS(fault) Z
Open Load < VOUT(OL)
>VOUT(OL)
Z
VIS =VIS(fault)
Z
Z
Normal Operation (ON) H ~Vbb IIS =IL/kILIS Z
Current Limitation < Vbb ZZ
Short Circuit to GND ~GND Z Z
Overtemperature Z Z Z
Short Circuit to Vbb Vbb IIS <IL/kILIS Z
Open Load ~Vbb ZZ
L = Low Level, H = High Level, Z = high impedance, potential depends on leakage currents and external circuit
channel 1
channel 2
gate control
I
IS2
OUT2
I
IS1
OUT1
SEN
IS1
µC
IN1
V
OUT(OL)
0
1
0
10
1
V
IS(fa u lt)
R
IN1
R
SEN
gate control
IN2
IS2
0
1
R
IN2
diagnosis
GND
R
OL
S
OL
load
VBB
Sens e. emf
R
IS1
R
IS2
R
lim
R
lim
I
L(PD)
Smart High-Side Power Switch
BTS5241-2L
Diagnosis
Data Sheet 18 Rev. 1.4, 2008-05-05
4.3.1 ON-State Diagnosis
The standard diagnosis signal is a current sense signal proportional to the load current. The accuracy of the ratio
(kILIS = IL / IIS) depends on the temperature. Please refer to Figure 14 for details. Usually a resistor RIS is connected
to the current sense pin. It is recommended to use sense resistors RIS > 500 Ω. A typical value is 4.7 kΩ
Figure 14 Current sense ratio kILIS
1)
In case of over-current as well as overtemperature, the current sense signal is switched off. As a result, one
threshold is enough to distinguish between normal and faulty operation. Open load and over-load can be
differentiated by switching off the channel and using open-load detection in off-state.
Details about timings between the diagnosis signal IIS and the output voltage VOUT and the load current IL in ON-
state can be found in Figure 15.
Figure 15 Timing of Diagnosis Signal in ON-state
4.3.2 OFF-State Diagnosis
Details about timings between the diagnosis signal IIS and the output voltage VOUT and the load current IL in OFF-
state can be found in Figure 16.
1) The curves show the behavior based on characterization data. The marked points are guaranteed in this Data Sheet in
Section 4.3.4 (Position 4.3.7).
4000
4500
5000
5500
6000
6500
7000
0 1 2 3 4 5 6
kILIS
I
L
/A
dummy
Tj = 150°C
dummy
Tj = -40°C
SwitchOn .emf
IN
V
OUT
I
IS
t
t
t
I
L
t
ON
t
ON
t
sIS( O N)
t
sIS( L C)
OFF
Data Sheet 19 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
Diagnosis
Figure 16 Timing of Diagnosis Signal in OFF-state
For open load diagnosis in off-state an external output pull-up resistor (ROL) is necessary, because the integrated
pull-down current IL(PD) causes secure suppression of the open load condition as long as no pull-up resistor is
activated. For calculation of the pull-up resistor, the pull-down current IL(PD) and the open load threshold voltage
VOUT(OL) has to be taken into account.
Ileakage defines the leakage current in the complete system e.g. caused by humidity. Vbb(min) is the minimum supply
voltage at which the open load diagnosis in off-state must be ensured.
To reduce the stand-by current of the system, an open load resistor switch (SOL) is recommended.
4.3.3 Sense Enable Function
The diagnosis signals can be switched off by a low signal at sense enable pin (SEN). See Figure 17 for details on
the timing between SEN pin and diagnosis signal IIS. Please note that the diagnosis is enabled, when no signal is
provided at pin SEN.
Figure 17 Timing of Sense Enable Signal
The SEN pin circuit is designed equal to the input pin. Please refer to Figure 5 for details. The resistors Rlim are
recommended to limit the current through the sense pins IS1 and IS2 in case of reverse polarity and overvoltage.
The stand-by current of the BTS5241-2L is minimized, when both input pins (IN1 and IN2) and the sense enable
pin (SEN) are on low level or left open and VOUT <VOUT(OL). In case of open load in off-state (VOUT >VOUT(OL) and
VIN = 0 V), diagnosis tries to switch on automatically which causes an increase in supply current. To reduce the
stand-by current to a minimum, the open load condition has to be suppressed by opening SOL.
SwitchOff. emf
IN
VOUT
IIS
t
t
t
Open Load, pull-up resistor active
VIS(fault)
/ RS
ON OFF
td(fault) t
s( fa u l t)
pull-up resistor
inactive
ROL
Vbb(min) VOUT(OL,max)
–
IL(PD,max) Ileakage
+
---------------------------------------------------------=
t
d IS( SEN)
t
sIS( S EN)
t
SEN.emf
t
sIS( SEN)
t
t
d IS( SEN)
I
IS
SEN
Smart High-Side Power Switch
BTS5241-2L
Diagnosis
Data Sheet 20 Rev. 1.4, 2008-05-05
4.3.4 Electrical Characteristics
Vbb = 9 V to 16 V, Tj = -40 °C to +150 °C, VSEN = 5 V (unless otherwise specified)
typical values: Vbb = 13.5 V, Tj = 25 °C
Pos. Parameter Symbol Limit Values Unit Test Conditions
min. typ. max.
Open Load at OFF state
4.3.1 Open load detection threshold voltage VOUT(
OL)
2.0 3.2 4.4 V
4.3.2 Integrated output pull-down current -IL(PD) 200 300 400 µA VOUT > VOUT(OL)
4.3.3 Sense signal in case of open load VIS(fault) 5.0 6.4 8 V VIN = 0 V
VOUT = Vbb
IIS = 1 mA
4.3.4 Sense signal current limitation IIS(LIM) 4– – mAVIN = 0 V
VOUT = Vbb
4.3.5 Sense signal invalid after negative input
slope
td(fault) –– 1.2msVIN = 5 V to 0 V
VOUT = Vbb
4.3.6 Fault signal settling time ts(fault) – – 200 µs VIN = 0 V
VOUT = 0 V to
> VOUT(OL)
IIS = 1 mA
Load Current Sense
4.3.7 Current sense ratio kILIS ––––VIN = 5 V
IL = 0.5 A
IL = 3.0 A
IL = 6.0 A
4170
4300
4350
5420
4850
4850
6670
5400
5350
–Tj = -40 °C
IL = 0.5 A
IL = 3.0 A
IL = 6.0 A
4450
4500
4550
5250
4950
4950
6050
5400
5350
–Tj = 150 °C
4.3.8 Current sense voltage limitation VIS(LIM) 5.0 6.3 7.5 V IIS = 0.5 mA
IL = 5 A
4.3.9 Current sense leakage/offset current IIS(LH) –– 5µAVIN = 5 V
IL = 0 A
4.3.10 Current sense leakage, while diagnosis
disabled
IIS(dis) –– 2µAVSEN = 0 V
IL = 5 A
4.3.11 Current sense settling time to IIS static
±10% after positive input slope
tsIS(ON) – – 300 µs VIN = 0 V to 5 V
IL = 5 A 1)
4.3.12 Current sense settling time to IIS static
±10% after change of load current
tsIS(LC) –– 50µsVIN
= 5 V
IL
= 3 A to 5 A
1)
Sense Enable
4.3.13 Input resistance RSEN 2.3 3.6 5.3 kΩ–
4.3.14 L-input level VSEN(L) -0.3 – 1.0 V –
4.3.15 H-input level VSEN(H) 2.6 – 17 V –
4.3.16 L-input current ISEN(L) 3– 75µA VSEN = 0.4 V
4.3.17 H-input current ISEN(H) 10 38 75 µA VSEN = 5 V
Data Sheet 21 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
Diagnosis
4.3.18 Current sense settling time tsIS(SEN) –310µsVSEN = 0 V to 5 V
VIN = 0 V
VOUT > VOUT(OL)
4.3.19 Current sense deactivation time tdIS(SEN) –– 10µsVSEN = 5 V to 0 V
IIS = 1 mA
RIS = 5 kΩ 1)
1) Not subject to production test, specified by design
Vbb = 9 V to 16 V, Tj = -40 °C to +150 °C, VSEN = 5 V (unless otherwise specified)
typical values: Vbb = 13.5 V, Tj = 25 °C
Pos. Parameter Symbol Limit Values Unit Test Conditions
min. typ. max.
Smart High-Side Power Switch
BTS5241-2L
Package Outlines BTS5241-2L
Data Sheet 22 Rev. 1.4, 2008-05-05
5 Package Outlines BTS5241-2L
Figure 18 PG-DSO-12-9 (Plastic Dual Small Outline Package)
Green Product (RoHS compliant)
To meet the world-wide customer requirements for environmentally friendly products and to be compliant with
government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e
Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020).
16
712
0.8
(1.55)
2.35
±0.1
0.1
±0.05 3)
2.6 MAX.
C
0.1
±0.3
10.3
(4.4)
4.2
±0.1
(1.8)
±0.1
1.6
ø0.8 x 0.1
-0.05
Depth
4)
+0.13
0.4
1
5 x 1=5
C
0.25
M
AB
±0.1
5.1
6.4
A
±0.1
7.5
B
±0.1
7.8
±0.1
(Heatslug)
0.25 B
(0.2)
0.7
±0.15
+0.075
0.25
-0.035
5˚
±3˚
8˚ 8˚
0.1 12x
1)
Seating Plane
+0.1
0
2)
Does not include plastic or metal protrusion of 0.15 max. per side
Stand OFF
Pin 1 Index Marking; Polish finish
Stand OUT
All package corners max. R 0.25
1)
2)
3)
4)
1)
C
For further information on alternative packages, please visit our website:
http://www.infineon.com/packages.Dimensions in mm
Data Sheet 23 Rev. 1.4, 2008-05-05
Smart High-Side Power Switch
BTS5241-2L
Revision History
6 Revision History
Revision Date Changes
1.4 2008-05-05 Initial version of RoHS-compliant derivate of BTS5241-2L
Page 3: AEC certified statement added
Page 3 and Page 20: RoHS compliance statement and Green product feature
added
Page 3 and Page 20: Package changed to RoHS compliant version
Legal Disclaimer updated
reversesave feature removed. Modification of the parameter 4.2.6 from 35mΩ
resistance to 800mV voltage drop. Change of the Parameter name
Page 6 : adding the footnote for output. Connection of the two pins necessary.
Edition 2008-05-05
Published by
Infineon Technologies AG
81726 Munich, Germany
© 5/5/08 Infineon Technologies AG
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any
information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties
and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights
of any third party.
Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements, components may contain dangerous substances. For information on the types in
question, please contact the nearest Infineon Technologies Office.
Infineon Technologies components may be used in life-support devices or systems only with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure
of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support
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