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
• Dual-channel synchronous buck DC/DC controller
– Wide input voltage range of 4V to 42V
– 1% accurate, fixed 3.3V, 5V, 12V, or adjustable
outputs from 0.8V to 36V
– 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 LM25137-Q1
with WEBENCH® Power Designer

2 Applications
• Automotive electronic systems
• Infotainment systems, instrument clusters
• Advanced driver assistance systems (ADAS)
• Body electronics and lighting

3 Description
The LM25137-Q1 is a 42V synchronous buck DC/DC
controller offered from a family with three options for
functional safety: Capable, ASIL B, and 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 22ns facilitates
large step-down ratios, enabling the direct conversion
from 12V and 24V automotive inputs to low-voltage
rails for reduced system design cost and complexity.
The LM25137-Q1 continues to operate during input
voltage dips as low as 4V, at 100% duty cycle if
needed. The 9μA no-load quiescent current with the
output voltage in regulation extends operating runtime
in battery-powered automotive systems.