LM76002 datasheet(12/54 Pages) TI1

12 / 54 page

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-Q1, LM76003-Q1

SNVSAU3 – DECEMBER 2017

www.ti.com

Product Folder Links: LM76002-Q1 LM76003-Q1

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7 Detailed Description

7.1 Overview

The LM76002-Q1/LM76003-Q1 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-Q1/LM76003-Q1

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-Q1/LM76003-Q1 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-Q1/LM76003-Q1 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-Q1/LM76003-Q1 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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