LM76002 datasheet(12/59 Pages) TI2

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REF

PVIN

BIAS

PGOOD

CONTROL LOGIC

AGND

PGND

Oscillator

LDO

SYNC/

MODE

VCC

HS I Sense

UVLO

HICCUP

Detector

Internal

OV/UV

Detector

PFM

Detector

Slope Comp

Precision

Enable

LS I Sense

PGood

ISSC

ICMD

VCC

CLK

FPWM

TSD

VBOOT

UVLO

SS/TRK

BOOT

LM76002, LM76003

SNVSAK0A – OCTOBER 2017 – REVISED OCTOBER 2019

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Product Folder Links: LM76002 LM76003

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7 Detailed Description

7.1 Overview

The LM76002/LM76003 regulator is an easy-to-use synchronous step-down DC-DC converter that operates from

3.5-V to 60-V supply voltage. The device is capable of delivering up to 2.5-A or 3.5-A DC load current with

exceptional efficiency and thermal performance in a very small solution size.

The LM76002/LM76003 employs fixed-frequency peak-current-mode control with configurable discontinuous

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

across the load range. The device can also be configured as forced-PWM (FPWM) operation to keep constant

switching frequency over the load range. The device is internally compensated, which reduces design time and

requires fewer external components. The switching frequency is programmable from 300 kHz to 2.2 MHz by an

external resistor. The LM76002/LM76003 is also capable of synchronization to an external clock operating within

the 300-kHz to 2.2-MHz frequency range. The wide switching frequency range allows the device to meet a wide

range of design requirements. It can be optimized to very small solution size with higher frequency or to very

high efficiency with lower switching frequency. It has very small minimum HS MOSFET on-time (tON-MIN) and

minimum off-time (tOFF-MIN) to provide wide range of voltage conversion. Automated frequency foldback is

employed under tON-MIN or tOFF-MIN condition to further extend the operation range.

The LM76002/LM76003 also features a power-good (PGOOD) flag, precision enable, internal or adjustable soft-

start rate, start-up with pre-bias voltage, and output voltage tracking. It provides a both flexible and easy-to-use

solution for wide range of applications. Protection features include thermal shutdown, VCC undervoltage lockout,

cycle-by-cycle current limiting, and short-circuit hiccup protection.

The family requires very few external components and has a pinout designed for simple, optimum PCB layout for

EMI and thermal performance. The LM76002/LM76003 device is available in a 30-pin WQFN lead-less package.

7.2 Functional Block Diagram

LM76002 Datasheet(PDF) 12 Page - Texas Instruments

LM76002 Datasheet(HTML) 12 Page - Texas Instruments

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