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LM74700-Q1 PDF预览

LM74700-Q1

更新时间： 2024-11-05 11:06:19
品牌 Logo 应用领域
德州仪器 - TI 控制器二极管
页数 文件大小 规格书
36页 3196K
描述
3.2V 至 65V、80uA IQ 汽车理想二极管控制器

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LM74700-Q1 数据手册

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LM74700-Q1
SNOSD17G – OCTOBER 2017 – REVISED DECEMBER 2020  
LM74700-Q1 Low IQ Reverse Battery Protection Ideal Diode Controller  
1 Features  
3 Description  
•
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  
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.  
•
•
•
•
•
Charge pump for external N-Channel MOSFET  
20-mV ANODE to CATHODE forward voltage drop  
regulation  
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.  
•
•
•
•
•
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  
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.  
2 Applications  
•
•
Automotive ADAS systems - camera  
Automotive infotainment systems - digital cluster,  
head unit  
Industrial factory automation - PLC  
Enterprise power supplies  
Device Information (1)  
PART NUMBER  
PACKAGE  
SOT-23 (6)  
SOT-23 (8)  
BODY SIZE (NOM)  
2.90 mm × 1.60 mm  
2.90 mm × 1.60 mm  
LM74700-Q1  
•
•
•
LM74700-Q1  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
Active ORing for redundant power  
VOUT  
VBATT  
TVS  
VOUT  
VGATE  
VBATT  
Voltage  
Regulator  
GATE CATHODE  
LM74700  
ANODE  
VCAP  
EN  
IBATT  
GND  
ON OFF  
Typical Application Schematic  
Reverse Current Blocking During Input Short  
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION  
DATA.  
 
 
 
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