LM74700-Q1 Low Iq, ideal diode controller | TI.com

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Low Iq, ideal diode controller



The LM74700-Q1 is an automotive AEC Q100 qualified ideal diode controller which operates in conjunction with an external N-channel MOSFET as an ideal diode rectifier for low loss reverse polarity protection with a 20-mV forward voltage drop. 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 device controls the GATE of the MOSFET to regulate the forward voltage drop at 20-mV. The regulation scheme enables graceful turn off of the MOSFET during a reverse current event and ensures zero DC reverse current flow. Fast response (< 0.75 µs) to Reverse Current Blocking makes the device suitable for systems with output voltage holdup requirements during ISO7637 pulse testing as well as power fail and input micro-short conditions.

The LM74700-Q1 controller provides a charge pump gate drive for an external N-channel MOSFET. The high voltage rating of LM74700-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.


  • AEC-Q100 Qualified with the following results
    • Device temperature grade 1:
      –40°C to +125°C Ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • Functional safety capable
    • Documentation available to aid functional safety system design
  • 3.2-V to 65-V Input range (3.9-V start up)
  • –65-V Reverse voltage rating
  • Charge pump for external N-Channel MOSFET
  • 20-mV ANODE to CATHODE forward voltage drop regulation
  • Enable pin feature
  • 1-µA Shutdown current (EN=Low)
  • 80-µA Operating quiescent current (EN=High)
  • 2.3-A Peak gate turnoff current
  • Fast response to reverse current blocking:
    < 0.75 µs
  • Meets automotive ISO7637 transient requirements with a suitable TVS Diode
  • 6-Pin SOT-23 Package 2.90 mm × 1.60 mm

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Part number Order Vin (Min) (V) Vabsmin (Min) (V) Vin (Max) (V) Vabsmax (Max) (V) Iq (Typ) (mA) Iq (Max) (mA) FET IGate source (Typ) (uA) IGate source (Max) (uA) IGate sink (Typ) (mA) IGate pulsed (Typ) (A) Features Operating temperature range (C) Package Group Approx. price (US$) IReverse (Typ) (uA) VSense reverse (Typ) (mV) Design support Rating Package size: mm2:W x L (PKG) Channel(s) controlled (#) VGS (Max) (V)
LM74700-Q1 Order now 3.2     -65     65     65     0.08     0.13     External     11000         2.3     Linear Control     -40 to 125     SOT-23 | 6     0.71 | 1ku       -11       Automotive     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)     1      
LM5050-1-Q1 Order now 5     -0.3     75     100     0.4     0.79     External     31     41     2.8     2.8     AUX Input
Linear Control    
-40 to 125
-40 to 150    
SOT-23-THIN | 6     1.00 | 1ku         -28 /-41     EVM
Simulation Model    
Automotive     6SOT-23-THIN: 5 mm2: 1.6 x 2.9 (SOT-23-THIN | 6)     1     14    
LM74202-Q1 Order now 4.2     -42     40     42     0.3     0.4     Internal             Integrated FET, Analog Current Monitor, Adjustable Current Limit
ON/OFF Control    
-40 to 125     HTSSOP | 16     1.39 | 1ku           Automotive     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)     1      
LM74610-Q1 Order now 0.48     -45     42     42     0     0     External     10     9.4     0.01     0.1     Linear Control     -40 to 125     VSSOP | 8     0.90 | 1ku     110     20     Calculation Tool
Reference Design
Simulation Model    
Automotive     8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)     1     2.5    
LM76202-Q1 Order now 4.2