LM53625-Q1, LM53635-Q1
SNVSAA7B – DECEMBER 2015 – REVISED JULY 2021
LM53625/35-Q1, 2.5-A or 3.5-A, 36-V Synchronous, 2.1-MHz, Step-Down DC-DC
Converter
1 Features
3 Description
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AEC-Q100 automotive qualified:
The LM53625-Q1/LM53635-Q1 synchronous buck
regulator is optimized for automotive applications,
providing an output voltage of 5 V, 3.3 V, or
an adjustable output. Advanced high-speed circuitry
allows the LM53625-Q1/LM53635-Q1 to regulate from
an input of 18 V to an output of 3.3 V at a fixed
frequency of 2.1 MHz. Innovative architecture allows
this device to regulate a 3.3-V output from an input
voltage of only 3.55 V. All aspects of the LM53625-
Q1/LM53635-Q1 are optimized for automotive and
performance-driven industrial customers. An input
voltage range up to 36 V, with transient tolerance
up to 42 V, eases input surge protection design.
The automotive-qualified Hotrod QFN package with
wettable flanks reduces parasitic inductance and
resistance while increasing efficiency, minimizing
switch node ringing, and dramatically lowering
electromagnetic interference (EMI). An open-drain
reset output, with built-in filtering and delay, provides
a true indication of system status. This feature
negates the requirement for an additional supervisory
component, saving cost and board space. Seamless
transition between PWM and PFM modes and
low quiescent current (only 15 µA for the 3.3 V
option) ensure high efficiency and superior transient
responses at all loads.
– Device temperature grade 1: –40°C to +125°C
ambient operating temperature range
– Device HBM classification level 2
– Device CDM classification level C6
–40°C to +150°C junction temperature range
15-µA quiescent urrent at no load (typical) with
3.3-V output
5.0-mm × 4.0-mm VQFN package with or without
wettable flanks and 0.6-mm VIN spacing
Low EMI and switch noise
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Spread spectrum option
External frequency synchronization
RESET output with internal filter and 3-ms release
timer
Pin-selectable forced PWM mode
Built-in compensation, soft start, current limit,
thermal shutdown, and UVLO
0.6-V dropout at 3.5 A at 105°C TA
±1% output voltage tolerance (–40°C to 125°C TJ)
Available with fixed 5-V, 3.3-V or adjustable output
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2 Applications
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Telematics
Head unit
Instrumentation cluster
Battery-powered applications
Device Information
DEVICE NAME
LM53625-Q1
PACKAGE(1)
BODY SIZE
VQFN-HR (22)
5.00 mm × 4.00 mm
LM53635-Q1
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Automotive Layout (22 mm x 12.5 mm)
Typical Application Circuit
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. PRODUCTION DATA.