SNOSDE0A February 2022 – May 2022 LM74502-Q1 , LM74502H-Q1
PRODUCTION DATA
The LM74502-Q1, LM74502H-Q1 is an automotive AEC-Q100 qualified controller which operates in conjunction with an external back-to-back connected N-channel MOSFETs as a low loss reverse polarity protection and load disconnect solution. The wide supply input range of 3.2 V to 65 V allows control of many popular DC bus voltages such as 12-V, 24-V and 48-V automotive battery systems. The 3.2-V input voltage support is particularly well suited for severe cold crank requirements in automotive systems. The device can withstand and protect the loads from negative supply voltages down to –65 V. The LM74502-Q1, LM74502H-Q1 does not have reverse current blocking and is suitable for input reverse polarity protection of loads that can potentially deliver energy back to the input supply such as automotive body control module motor loads.
The LM74502-Q1 controller provides a charge pump gate drive for an external N-channel MOSFET. The high voltage rating of LM74502-Q1 helps to simplify the system designs for automotive ISO7637 protection. With the enable pin low, the controller is off and draws approximately 1 µA of current, thus offering low system current when put into sleep mode. LM74502-Q1 offers programmable overvoltage and undervoltage protection which cuts off the load from the input source in case of these faults.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM74502-Q1 LM74502H-Q1 | SOT-23 (8) | 2.90 mm × 1.60 mm |
Changes from Revision * (February 2022) to Revision A (May 2022)
Parameter | LM74502-Q1 | LM74502H-Q1 |
---|---|---|
Gate drive strength | 60 μA | 11 mA |
PIN | I/O(1) | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | EN/UVLO | I | EN/UVLO input. Connect to VS pin for always ON operation. Can be driven externally from a micro controller I/O. Pulling this pin low below V(ENF) makes the device enter into low Iq shutdown mode. For UVLO, connect an external resistor ladder from input supply to EN/UVLO to GND. |
2 | GND | G | Ground pin |
3 | N.C | — | No connection |
4 | VCAP | O | Charge pump output. Connect to external charge pump capacitor. |
5 | VS | I | Input power supply pin to the controller. Connect a 100-nF capacitor across VS and GND pins. |
6 | GATE | O | Gate drive output. Connect to gate of the external N-channel MOSFET. |
7 | OV | I | Adjustable overvoltage threshold input. Connect a resistor ladder across input and output. When the voltage at OV pin exceeds the overvoltage cutoff threshold, then the GATE is pulled low. GATE turns ON when the OV pin voltage goes below the OV protection falling threshold. Connect OV pin to GND if OV feature is not used. |
8 | SRC | I | Source pin. Connect to common source point of external back-to-back connected N-channel MOSFETs or the source pin of the high side switch MOSFET. |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Input Pins | VS to GND | –65 | 65 | V |
EN/UVLO, OV to GND, V(VS) > 0 V | –0.3 | 65 | V | |
EN/UVLO, OV, V(VS) ≤ 0 V | V(VS) | (65 + V(VS)) | ||
SRC to GND, V(VS) ≤ 0 V | (V(VS) + 0.3) | V | ||
Input Pins | SRC to GND, V(VS) > 0 V | –(70 – V(VS)) | V(VS) | V |
Output Pins | GATE to SRC | 0 | 15 | V |
VCAP to VS | –0.3 | 15 | V | |
Operating junction temperature(2) | –40 | 150 | °C | |
Storage temperature, Tstg | –40 | 150 | °C |