3.2-V to 65-V, 80-uA IQ automotive ideal diode controller
Product details
Parameters
Package | Pins | Size
Features
- 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
- 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
- Available in 6-pin and 8-pin SOT-23 Package 2.90 mm × 1.60 mm
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Description
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.
Same functionality and pinout but is not an equivalent to the compared device:
Similar but not functionally equivalent to the compared device:
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | LM74700-Q1 Low IQ Reverse Battery Protection Ideal Diode Controller datasheet (Rev. G) | Dec. 21, 2020 |
| Application note | Basics of Ideal Diodes (Rev. A) | Feb. 17, 2021 | |
| Application note | Multibattery management in medical ultrasound systems (Rev. A) | Jan. 21, 2021 | |
| User guide | LM74700DDFEVM: Evaluation Module for LM74700-Q1 | Dec. 10, 2020 | |
| Technical article | Meet airline restrictions with power-path control for dual batteries | Jul. 21, 2020 | |
| White paper | Streamlining Functional Safety Certification in Automotive and Industrial | Jun. 09, 2020 | |
| White paper | 簡化汽車及工業領域的功 能安全認證 | Jun. 09, 2020 | |
| White paper | 자동차 및 산업 분야의 기능적 안전성 인증 간소화 | Jun. 09, 2020 | |
| Functional safety information | LM74700-Q1 Functional Safety FIT Rate and Failure Mode Distribution | Dec. 16, 2019 | |
| E-book | 11 Ways to Protect Your Power Path white paper | Jul. 03, 2019 | |
| Application note | Basics of Power Switches (Rev. A) | Apr. 26, 2019 | |
| User guide | LM74700 Evaluation Module (Rev. A) | Feb. 11, 2019 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The LM74700DDFEVM helps designers evaluate the operation and performance of the LM74700-Q1 3.2-V to 65-V, 80-μA IQ automotive ideal diode controller (DDF package). This evaluation module demonstrates how an N-channel power MOSFET can emulate a very-low forward voltage diode with low IQ and (...)
Features
- Reverse battery protection
- Very low shutdown current
- Meets automotive ISO 7637-2 standard
- Fast response to reverse current blocking
Description
Features
- Reverse battery protection
- Very low shutdown current
- Meets sutomotive ISO 7637-2 standard
- Fast response to reverse current blocking
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Reference designs
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| SOT-23 (DBV) | 6 | View options |
| SOT-23-THIN (DDF) | 8 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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Support & training
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