1 Features
• AEC-Q100 qualified for automotive applications:
– Device temperature grade 1: –40°C to 125°C
ambient operating temperature
• Versatile synchronous buck DC/DC controller
– Wide input voltage range of 4V to 42V
– Fixed 3.3V, 5V or adjustable output voltage
from 0.8V to 36V
– –40°C to 150°C junction temperature range
– Integrated high-current MOSFET gate drivers
with 1.65A source and 2.4A sink capability
– Lossless inductor DCR or shunt current sensing
– 25ns tON(min) for high VIN to VOUT conversion
– 80ns tOFF(min) for high duty-cycle applications
– No-load sleep quiescent current of 10μA
– Shutdown quiescent current of 2.3μA
• Optimized for CISPR 25 Class 5 EMI requirements
– Dual Random Spread Spectrum (DRSS) with
5% or 10% frequency modulation
– Switching frequency from 100kHz to 3.2MHz
– Optional synchronization to an external clock
– Selectable PFM or FPWM operation
• Inherent protection features for robust design
– Hiccup-mode overcurrent protection
– Precision enable input and open-drain PGOOD
indicator for sequencing and control
– VCC and gate-drive UVLO protection
– Fixed 3ms output voltage soft start
– Thermal shutdown protection with hysteresis
• 16-pin, 3mm × 3mm package with wettable flanks
• Create a custom design using the LM25139-Q1
with WEBENCH® Power Designer

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

3 Description
The LM25139-Q1 is a 42V, synchronous, buck DC/DC
controller with ultra-low IQ for single-output, highcurrent
regulator circuits. Deriving from a family of
wide-VIN range automotive controllers, the device
uses a peak current-mode control architecture for fast
transient response, convenient loop compensation,
and excellent load and line regulation performance.
A high-side switch minimum on time of 25ns provides
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 LM25139-Q1 continues to operate during input
voltage dips as low as 4V, at nearly 100% duty cycle
if needed, making the device an excellent choice for
high-performance, automotive battery applications.
The LM25139-Q1 comes in a thermally enhanced, 16-
pin VQFN package with wettable flank pins and an
exposed pad to aid in thermal dissipation.