LM5166 datasheet(13/53 Pages) TI1

13 / 53 page

HI ILIM

DETECT

VDD UVLO

ON-TIME

ONE SHOT

LDO BIAS

REGULATOR

VIN

ENABLE

THERMAL

SHUTDOWN

VIN UVLO

ZC / LS ILIM

DETECT

VDD

I-LIMIT

SELECT

Control

Logic

VIN

OUT

HYSTERETIC

MODE

REFERENCE

SOFT-START

ENABLE

VOLTAGE

REFERENCE

1.223V

VIN

1.22V

1.144V

HYS

ILIM

VOUT

GND

PGOOD

1.137V

1.088V

LM5166

www.ti.com

SNVSA67A – DECEMBER 2016 – REVISED DECEMBER 2016

Product Folder Links: LM5166

Submit Documentation Feedback

7 Detailed Description

7.1 Overview

The LM5166 regulator is an easy-to-use synchronous buck DC/DC converter that operates from a 3-V to 65-V

supply voltage. The device is intended for step-down conversions from 5-V, 12-V, 24-V, and 48-V unregulated,

semi-regulated and fully-regulated supply rails. With integrated high-side and low-side power MOSFETs, the

LM5166 delivers up to 500-mA DC load current with exceptional efficiency and ultra-low input quiescent current

in a very small solution size.

Designed for simple implementation, a choice of operating modes offers flexibility to optimize its usage according

to the target application. Fixed-frequency, constant on-time (COT) operation with discontinuous conduction mode

(DCM) at light loads is ideal for low-noise, high current, fast transient load requirements. Alternatively, pulse

frequency modulation (PFM) mode achieves ultra-high light-load efficiency performance. Control loop

compensation is not required with either operating mode which reduces design time and external component

count.

The LM5166 incorporates other features for comprehensive system requirements, including an open-drain Power

Good circuit for power-rail sequencing and fault reporting, internally-fixed or externally-adjustable soft-start,

monotonic startup into pre-biased loads, precision enable with customizable hysteresis for programmable line

undervoltage lockout (UVLO), and thermal shutdown with automatic recovery. These features enable a flexible

and easy-to-use platform for a wide range of applications. The pin arrangement is designed for simple and

optimized PCB layout, requiring only a few external components.

7.2 Functional Block Diagram

LM5166 Datasheet(PDF) 13 Page - Texas Instruments

LM5166 Datasheet(HTML) 13 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

Datasheet Download

Link URL