1 Features

? Functional Safety-Capable

– Documentation available to aid functional safety

system design

? Synchronous DC/DC converter with a versatile

buck controller and robust power MOSFETs

– Wide input voltage range: 4.5V to 80V

– Shutdown mode current: 2.3μA

– No-load IQ regulating 48V to 5V: 8.2μA

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

outputs from 0.8V to 55V

– Dual-phase operation enabling output currents

up to 16A

? Designed for low EMI requirements

– Facilitates CISPR 11 Class B compliance

– Pin-selectable ±8% dual-random spread

spectrum reduces peak emissions

– Switching frequency: 200kHz to 2.2MHz

– Pin-configurable AUTO or FPWM operation

? Inherent protection features for robust design

– Internal hiccup-mode overcurrent protection

– Enable, power good, and thermal shutdown

– Internal or external loop compensation

? 6mm × 6mm thermally optimized, RoHS compliant,

QFN-29 package with Pb-free plating

? Create a custom design using the LM708x0 with

the WEBENCH? Power Designer

2 Applications

? Industrial: motor drives (Servo/AC), factory

automation, off-highway vehicles and eBikes

? Communications: WLAN, AAS and RRU

3 Description

The LM708x0 is a family of low-IQ, wide-VIN

synchronous buck converters designed for an input

voltage range of 4.5V to 80V and delivering up to 8A

of output current at fixed output voltages of 3.3V, 5V,

12V, or an adjustable output.

The LM708x0 uses a peak current-mode control

architecture for easy loop compensation, fast transient

response, and excellent load and line regulation. A

pair of LM708x0 converters can be set up in an

interleaved mode (paralleled outputs) with accurate

current sharing for applications requiring up to 16A of

output current.

The LM708x0 features a unique Dual Random

Spread Spectrum (DRSS) function that combines

low-frequency triangular and high-frequency cycleby-

cycle random modulations for improved EMI

performance across a wide range of frequency bands.