LM43602 datasheet(12/44 Pages) TI2

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Precision

Enable

VCC

Enable

Slope

Comp

LDO

HICCUP

Detector

PFM

Detector

TSD

Oscillator

PWM CONTROL LOGIC

Freq

Foldback

Zero

Cross

UVLO

CBOOT

VIN

BIAS

PGOOD

ENABLE

AGND

PGND

SYNC

VCC

HS I Sense

ISSC

LS I Sense

PGood

SS/TRK

OV/UV

Detector

REF

Internal

+ ±

LM43602-Q1

SNVSA83C – APRIL 2015 – REVISED OCTOBER 2017

www.ti.com

Product Folder Links: LM43602-Q1

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7 Detailed Description

7.1 Overview

The LM43602-Q1 regulator is an easy-to-use synchronous step-down DC-DC converter that operates from 3.5-V

to 36-V supply voltage. The device delivers up to 2-A DC load current with exceptional efficiency and thermal

performance in a very small solution size. An extended family is available in 0.5-A, 1-A, and 3-A load options in

pin-to-pin compatible packages.

The LM43602-Q1 employs fixed frequency peak current mode control with discontinuous conduction mode

(DCM) and pulse frequency modulation (PFM) mode at light load to achieve high efficiency across the load

range. The device is internally compensated, which reduces design time, and requires fewer external

components. The switching frequency is programmable from 200 kHz to 2.2 MHz by an external resistor RT. It is

default at 500 kHz without RT resistor. The LM43602-Q1 is also capable of synchronization to an external clock

within the 200-kHz to 2.2-MHz frequency range. The wide switching frequency range allows the device to be

optimized to fit small board space at higher frequency, or high efficient power conversion at lower frequency.

Optional features are included for more comprehensive system requirements, including power-good (PGOOD)

flag, precision enable, synchronization to external clock, extendable soft-start time, and output voltage tracking.

These features provide a flexible and easy to use platform for a wide range of applications. Protection features

include overtemperature shutdown, VCC undervoltage lockout (UVLO), cycle-by-cycle current limit, and short-

circuit protection with hiccup mode.

The family requires few external components and the pin arrangement was designed for simple, optimum PCB

layout. The LM43602-Q1 device is available in the HTSSOP / PWP 16-pin leaded package.

7.2 Functional Block Diagram

LM43602 Datasheet(PDF) 12 Page - Texas Instruments

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