1 Features

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Designed for reliability in rugged applications

– Wide input voltage range of 6V to 120V

absolute maximum

– Junction temperature range: –40°C to +150°C

– Fixed 3ms internal soft-start timer

– Peak and valley current-limit protection

– Input UVLO and thermal shutdown protection

• Designed for scalable industrial power supplies

and battery packs

– Low minimum on and off times of 50ns

– Adjustable switching frequency up to 1MHz

– Diode emulation for high light-load efficiency

– Auto mode with low quiescent current (< 10μA)

– FPWM for Fly-Buck converter capability

– 3μA shutdown quiescent current

– Pin-to-pin compatible with LM5164-Q1,

LM5163-Q1, and LM5013-Q1

– Similar pinout and functionality to LM5017 and

LM34927.

• Integration reduces design size and cost

– COT mode control architecture

– Integrated 1.9Ω NFET buck switch

– Integrated 0.71Ω NFET synchronous rectifier

– 1.2V internal voltage reference

– No loop compensation components

– Internal VCC bias regulator and boot diode

– Open-drain power-good indicator

– Package options: SOIC PowerPAD™-8

integrated circuit package or WSON-8 package

2 Applications

• Communications – brick power module

• Industrial battery pack (≥ 10 S)

• Battery pack – e-bike, e-scooter, LEV

3 Description

The LM5169 and LM5168 synchronous buck

converters are designed to regulate over a wide input

voltage range, minimizing the need for external surge

suppression components. A minimum controllable on

time of 50ns facilitates large step-down conversion

ratios, enabling the direct step-down from a 48V

nominal input to low-voltage rails for reduced system

complexity and design cost. The LM516x operates

during input voltage dips as low as 6V, at nearly 100%

duty cycle if needed, making the device an excellent

choice for wide input supply range industrial and high

cell count battery pack applications.

With integrated high-side and low-side power

MOSFETs, the LM5169 delivers up to 0.65A of output

current and the LM5168 delivers up to 0.3A of output

current. A constant on-time (COT) control architecture

provides nearly constant switching frequency with

excellent load and line transient response. The

LM516x is available in FPWM or auto mode versions.

FPWM mode provides forced CCM operation across

the entire load range supporting isolated Fly-Buck

converter applications. Auto mode enables ultra-low

IQ and diode emulation mode operation for high lightload

efficiency.