LM46002PWPR datasheet(14/52 Pages) TI

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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

+ ±

LM46002

SNVSA13B – APRIL 2014 – REVISED SEPTEMBER 2014

www.ti.com

8 Detailed Description

8.1 Overview

The LM46002 SIMPLE SWITCHER® regulator is an easy to use synchronous step-down DC-DC converter that

operates from 3.5 V to 60 V supply voltage. It is capable of delivering 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 and 1.0

A load options in pin-to-pin compatible packages.

The LM46002 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 defaults at 500 kHz

without RT. The LM46002 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 over temperature shutdown, VCC under-voltage 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 LM46002 device is available in the HTSSOP / PWP 16 pin leaded package (5.1 mm x 6.6 mm x 1.2

mm) with 0.65 mm lead pitch.

8.2 Functional Block Diagram

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LM46002PWPR Datasheet(PDF) 14 Page - Texas Instruments

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