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

? Versatile synchronous buck DC/DC controller

– Wide input voltage range of 3.5 V to 42 V

– 1 accurate, fixed 3.3-V, 5-V, or adjustable

outputs from 0.6 V to 36 V

– 150°C maximum junction temperature

– 3.3-μA typical shutdown mode current

– 15-μA typical no-load standby current

? Two interleaved synchronous buck channels

– Dual channel or single-output multiphase

– 65-ns tON(min) for high VIN/VOUT ratio

– 60-ns tOFF(min) for low dropout

? Inherent protection features for robust design

– Hiccup mode overcurrent protection

– Independent ENABLE and PGOOD functions

– Adjustable output voltage soft start

– VCC, VDDA, and gate-drive UVLO protection

– Thermal shutdown protection with hysteresis

? Optimized for CISPR 25 class 5 EMI requirements

– Slew-rate controlled adaptive gate drivers

– Spread spectrum reduces peak emissions

? 100-kHz to 2.2-MHz switching frequency

– SYNC in and SYNC out capability

– Selectable diode emulation or FPWM modes

? VQFN-40 package with wettable flank pins

? Create a custom design using the LM25143-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 LM25143-Q1 is a 42-V DC/DC synchronous

buck controller for high-current single or dual outputs.

Deriving from a family of wide-VIN range controllers,

the device uses an interleaved, stackable, peak

current-mode control architecture for easy loop

compensation, fast transient response, excellent load

and line regulation, and accurate current sharing with

paralleled phases for higher output current. A highside

switch minimum on time of 65 ns provides large

step-down ratios, enabling the direct conversion from

12-V or 24-V automotive inputs to low-voltage rails for

reduced system complexity and cost. The LM25143-

Q1 continues to operate during input voltage dips as

low as 3.5 V, at nearly 100 duty cycle if needed.

The 15-μA no-load quiescent current with the

output voltage in regulation extends operating runtime

in battery-powered automotive systems. Power

the LM25143-Q1 from the output of the switching

regulator or another available source for even lower

input quiescent current and power loss.