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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.
LM53625-Q1, LM53635-Q1
SNVSAA7A – DECEMBER 2015 – REVISED MAY 2016
LM53625/35-Q1, 2.5-A or 3.5-A, 36-V Synchronous, 2.1-MHz, Step-Down DC-DC Converter
1
1 Features
1
AEC-Q100 Automotive Qualified:
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 Current at no Load (Typical) with
3.3-V Output
4 mm × 5 mm, 0.5-mm Pitch VQFN Package With
Wettable Flanks and 0.6-mm VIN Spacing
Low EMI and Switch Noise
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
2 Applications
Automotive Telematics
Navigation Systems
In-Dash Instrumentation
Battery-Powered Applications
3 Description
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 Information(1)
DEVICE NAME
PACKAGE
BODY SIZE
LM53625-Q1
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 Application Circuit
Typical Automotive Layout (22 mm x 12.5 mm)


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