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

• Functional Safety-Compliant options – ASIL B and

ASIL D – available through request (LM5137F-Q1)

• Versatile dual synchronous buck DC/DC controller

– Wide input voltage range of 4V to 80V

– 1% accurate, fixed 3.3V, 5V, 12V, or adjustable

outputs from 0.8V to 60V

– 150°C maximum junction temperature

– Charge-pump gate drivers for 100% duty cycle

• Two interleaved synchronous buck channels

– Dual channel or single-output multiphase

– Stackable up to four phases

– SYNC in and SYNC out capability

• Inherent protection features for robust design

– Internal hiccup-mode overcurrent protection

– Independent ENABLE and PGOOD functions

– Adjustable output voltage soft start

– VCC and gate-drive UVLO protection

– Thermal shutdown protection with hysteresis

• Designed for ultra-low EMI requirements

– Dual Random Spread Spectrum (DRSS)

– Switching frequency from 100kHz to 2.5MHz

• VQFN-36 package with wettable flanks

• Create a custom design using the LM5137-Q1 with

WEBENCH® Power Designer

2 Applications

• Automotive electronic systems

• Infotainment systems, instrument clusters, ADAS

• Body electronics and lighting

• High-voltage battery-operated systems

3 Description

The LM5137-Q1 is an 80V synchronous buck DC/DC

controller offered from a family with three options for

functional safety: Capable, ASIL B, or ASIL D. The

device uses an interleaved, stackable, peak currentmode

architecture for easy loop compensation, fast

transient response, excellent load and line regulation,

and accurate current sharing with paralleled phases

for high output current.

A high-side switch minimum on-time of 15ns facilitates

large step-down ratios, enabling the direct conversion

from 12V, 24V or 48V automotive inputs to lowvoltage

rails for reduced system design cost and

complexity. The LM5137-Q1 continues to operate

during input voltage dips as low as 4V, at 100% duty

cycle if needed. The 12.7μA no-load quiescent current

with the output voltage in regulation extends operating

run-time in battery-powered automotive systems.