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BTS737S3
Smart High Side Switches
Datasheet BTS737S3 Smart High-Side Power Switch
Four Channels: 4 x 35mΩ
Advanced Current Sense
Product Summary Package
General Description N channel vertical power MOSFET with charge pump, ground referenced CMOS compatible input and
diagnostic feedback, monolithically integrated in Smart SIPMOS technology. Providing embedded protective functions
Applications µC compatible high-side power switch with diagnostic feedback for 12V and 24V grounded loads All types of resistive and capacitve loads Most suitable for loads with high inrush currents, so as lamps Replaces electromechanical relays, fuses and discrete circuits
Basic Functions Very low standby current Improved electromagnetic compatibility (EMC)
• CMOS compatible input Stable behaviour at undervoltage Wide operating voltage range
Protection Functions Short circuit protection
• Overload protection
• Current limitation
• Thermal shutdown Reverse battery protection with external resistor Overvoltage protection with external resistor (incl. load dump) Loss of ground protection Electrostatic discharge protection (ESD)
Diagnostic Function Proportional load current sense (with defined fault signal
during thermal shutdown and current limit)
Block Diagram
Datasheet BTS737S3
Functional diagram Datasheet BTS737S3
Pin Definitions and Functions
Pin configuration Datasheet BTS737S3
Maximum Ratings at Tj = 25°C unless otherwise specified Single pulse ) Current limit is a protection function. Operation in current limitation is considered as "outside" normal
operating range. Protection functions are not designed for continuous repetitive operation. Supply voltages higher than Vbb(AZ) require an external current limit for the GND and status pins (a 75Ω
resistor for the GND connection is recommended.
4) RI = internal resistance of the load dump test pulse generator
5) VLoad dump is setup without the DUT connected to the generator per ISO 7637-1 and DIN 40839 Device on 50mm*50mm*1.5mm epoxy PCB FR4 with 6cm2 (one layer, 70µm thick) copper area for Vbb
Datasheet BTS737S3
Thermal Characteristics
Electrical Characteristics
Load Switching Capabilities and Characteristics Soldering point: upper side of solder edge of device pin 7,8. See page 16. Device on 50mm*50mm*1.5mm epoxy PCB FR4 with 6cm2 (one layer, 70µm thick) copper area for Vbb
connection. PCB is vertical without blown air. See page 15
Datasheet BTS737S3
Operating Parameters
Protection Functions12)
Reverse Battery (not subject to production test - specified by design) 10) Supply voltages higher than Vbb(AZ) require an external current limit for the GND and status pins (a 75Ω
resistor for the GND connection is recommended). See also VON(CL) in table of protection functions and
circuit diagram on page 9.
11) Measured with load; for the whole device; all channels off.
12) 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 not designed for continuous repetitive operation.
13) If channels are connected in parallel, output clamp is usually accomplished by the channel with the lowest ON(CL).
14) The temperature protection and sense functionality is not active during reverse current operation! Input and
Status currents have to be limited (see max. ratings page 4 and circuit page 9). ) The reverse load current through the intrinsic drain-source diode has to be limited by the connected load.
Datasheet BTS737S3
Input16)
Diagnostic Characteristics 16) If ground resistors RGND are used, add the voltage drop across these resistors.
17) In the case of current limitation or thermal shutdown the sense signal is no longer a current proportional to
the load current, but a fixed voltage of typ. 6 V.
18) In the case of thermal shutdown the V signal remains for t longer than the restart of the switch (see
Datasheet BTS737S3
Truth Table L = "Low" Level X = don't care Z = high impedance, potential depends on external circuit
H = "High" Level Vfault = 6V typ, constant voltage independent of external used sense resistor.
Parallel switching of channels is possible by connecting the inputs and outputs in parallel. The current sense
outputs have to be connected with a single sense resistor.
Terms
PROFETOUT2
GND1/2
OUT1
Chip 1
Vbb
PROFETOUT4
GND3/4
OUT3
Chip 2
Vbb
LeadframeIN1
IIN1
IN25IIN2
IS12IIS1
IS26IIS2
VIN1
Vbb
IIGND1/2
Ibb
VON1VON2
IL1
IL2
VOUT1VOUT2
VIS1VIS2
VIN2
LeadframeIN3
IIN3
IN412IIN4
IS39IIS3
IS413IIS4
VIN3
Vbb
IIGND3/4
VON3VON4
IL3
IL4
VOUT3VOUT4
VIS3VIS4
VIN4
Leadframe (Vbb) is connected to pin 1, 7, 8, 14, 15, 28.
19) Current limitation is only possible while the device is switched on.
20) Low ohmic short to Vbb may reduce the output current IL and therefore also the sense current IIS.
