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.