1 Features

• AEC-Q100-qualified for automotive applications

– Device temperature grade 1: –40°C to +125°C

ambient operating temperature

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Supports automotive system requirements

– Input voltage range: 3.5 V to 36 V

– Short 50-ns minimum on time

– Good EMI performance

Pseudo-random spread spectrum

Compatible with CISPR 25

– 23-μA low operating quiescent current

– –40°C to +150°C junction temperature range

• High design flexibility

– Pin selectable VOUT: 3.3 V, 5 V, adjustable

1 V to 20 V

– Pin compatible with the LM63610 and LM63635

(1 A, 3.25 A)

– Pin selectable frequency: 400 kHz, 2.1 MHz,

adjustable 250 kHz to 2200 kHz

– Pin selectable FPWM, auto, sync modes

– TSSOP: thermally enhanced package

– WSON: for space-constrained applications

• Small solution size

– As small as 10 mm × 10 mm for 2.5 A, 2.2 MHz

with WSON package

– Highly integrated solution

– Low component count

2 Applications

• Automotive infotainment and cluster

• Automotive body electronics and lighting

• Automotive ADAS

3 Description

The LM636x5-Q1 is an easy-to-use, synchronous,

step-down DC/DC converter designed for rugged

automotive applications. The LM636x5-Q1 can drive

up to 1.5-A or 2.5-A of load current from an

input of up to 36 V. The converter has high light

load efficiency and output accuracy in a small

solution size. Features such as a RESET flag and

precision enable provide both flexible and easy-to-use

solutions for a wide range of applications. Automatic

frequency foldback at light load improves efficiency

while maintaining tight load regulation. Integration

eliminates many external components and provides

a pinout designed for simple PCB layout. Protection

features include thermal shutdown, input undervoltage

lockout, cycle-by-cycle current limit, and hiccup shortcircuit

protection. The LM636x5-Q1 is available in the

HTSSOP 16-pin power package, with PowerPAD™ ,

and the WSON 12-pin power package.