LM76005 datasheet(11/51 Pages) TI2

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7 Detailed Description

7.1 Overview

The LM76005 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 5-A DC load current with exceptional efficiency

and thermal performance in a very small solution size.

The LM76005 employs fixed-frequency peak-current-mode control with configurable discontinuous conduction

mode (DCM) and pulse frequency modulation (PFM) mode at light loads 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 200 kHz to 500 kHz by an external

resistor. The LM76005 is also capable of synchronization to an external clock operating within the 200-kHz to

500-kHz frequency range. The wide switching frequency range allows the device to meet a wide range of design

requirements. It can be optimized for a very small solution size with higher frequency or for 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 LM76005 also features the following:

• A power-good (PGOOD) flag

• Precision enable

• Internal or adjustable soft-start rate

• Start-up with pre-bias voltage

• Output voltage tracking

It provides a 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 LM76005 device is available in a 30-pin WQFN lead-less package.

7.2 Functional Block Diagram

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

www.ti.com

LM76005

SNVSBK5A – FEBRUARY 2020 – REVISED JULY 2020

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