parameter：
|
Vin (Min) (V) |
3.2 |
|
Vin (Max) (V) |
65 |
|
Features |
Enable, Reverse polarity protection |
|
Iq (Typ) (mA) |
0.06 |
|
Iq (Max) (mA) |
0.110 |
|
IGate source (Typ) (uA) |
60 |
|
IGate sink (Typ) (mA) |
2370 |
|
IGate pulsed (Typ) (A) |
2.37 |
|
Operating temperature range (C) |
-40 to 125 |
|
Design support |
EVM |
|
Rating |
Automotive |
|
Channel(s) controlled (#) |
1 |
|
FET |
External |
Package | pin | size：
|
SOT-23-THN (DDF) |
8 |
8 mm² 2.9 x 2.8 |
characteristic：
It has the following characteristics according to aec-q100 standard
Device temperature class 1: – 40 ° C to +125 ° C ambient operating temperature range
Device HBM ESD class 2
Device CDM ESD classification class C4B
3.2V to 65V input range (3.9v start)
-65V input reverse voltage rating
Integrated charge pump for driving
External back-to-back n-channel MOSFET
External high side switch MOSFET
External reverse polarity protection MOSFET
Grid driver model
Lm74502-q1:60 µ a peak grid drive pull current capability
Lm74502h-q1:11ma peak grid drive pull current capability
2A peak grid current filling capacity
1 µ a off current (en/uvlo = low level)
45 µ a typical operating quiescent current (en/uvlo = high level)
Adjustable overvoltage and undervoltage protection
Additional TVs diodes are used to meet the transient requirements of automotive ISO7637 pulse 1
2.90mm in 8-pin SOT-23 package × 1.60mm
explain：
Lm74502-q1 and lm74502h-q1 are controllers that comply with the automotive aec-q100 standard. They work together with external back-to-back connected n-channel MOSFETs to achieve low loss reverse polarity protection and load disconnection solutions. The wide power input range from 3.2V to 65V can control many common DC bus voltages (such as 12V, 24V and 48V automotive battery systems). The 3.2V input voltage support is applicable to the harsh cold start requirements in automotive systems. The device can withstand and protect the load from negative supply voltage as low as – 65V. Lm74502-q1 and lm74502h-q1 have no reverse current blocking function and are applicable to providing input reverse polarity protection for loads that may transmit energy back to the input power supply (such as motor load of automobile body control module).
Lm74502-q1 controller can provide charge pump gate driver for external n-channel MOSFET. The high voltage rating of lm74502-q1 helps to simplify the system design that meets the ISO7637 automotive protection test standard. When the enable pin is at low level, the controller turns off and consumes about 1 µ a of current, thus providing low system current when entering sleep mode. Lm74502-q1 has programmable overvoltage and undervoltage protection functions, which can cut off the load from the input source in case of these faults.
Picture display：
