LM74700-Q1 Low IQ Reverse Battery Protection Ideal Diode
Controller
1 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
– 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
• Available in 6-pin and 8-pin SOT-23 Package
2.90
mm × 1.60 mm
2 Applications
• Automotive ADAS systems -
camera
• Automotive infotainment systems - digital
cluster,
head unit
• Industrial factory automation -
PLC
• Enterprise power supplies
• Active ORing for redundant power
3 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.
Active |
N+1 ORing Controller |
N-Channel |
Output |
No |
1.4 µs |
450 ns |
5A |
3.2V ~ 65V |
Automotive |
-40°C ~ 125°C (TJ) |
Surface Mount |
SOT-23-6 |
SOT-23-6 |
LM74700 |
ROHS3 Compliant |
2 (1 Year) |
EAR99 |
8542.39.0001 |
REACH Unaffected |
Room 1202-1203, East Building, Shengtang Building, Tairan 9th Road, Futian District, Shenzhen