6 Detailed Description

6.1 Overview

The TPS61371 is a highly-integrated, synchronous boost converter to support 16V output with load disconnect

and short protection built-in. The TPS61371 supports input voltage ranging from 2.7V to 5.5V. The TPS61371

uses the peak current mode with adaptive off-time control topology to regulate the output voltage. The

TPS61371 operates at a quasi-constant frequency pulse width modulation (PWM) at moderate to heavy load

current. At the beginning of each cycle, the low-side FET turns on and the inductor current ramps up to reach

a peak current determined by the output of the error amplifier (EA). When the peak current preset value

determined by the output trips of the EA, the low-side FET turns off. As long as the low-side FET turns off, the

high-side FET turns on after a short delay time to avoid the shoot through. The duration of low-side FET off state

is determined by the VIN / VOUT ratio.

High efficiency is achieved at light load as the TPS61371 operates in PFM operation. The device can be also

configured at forced PWM mode to keep the frequency constant across the whole load range and to have more

immunity against noise sensitive applications. The work mode depends on the FPWM bit in the CONTROL

register. See also the FPWM bit in Table 7-3 for detailed I2C settings.

6.2 Functional Block Diagram

VIN

EN

SW

FB

GND

L

RUP

RDOWN

OFF

ON

CIN

VOUT

COUT

BST

CBST

RC

Cc

COMP

VCC

VREF

+

+

Gm

S

Q

R

VOUT

Q

Hiccup

VOUT

Control

Fault

Proteciton

UVLO

OVP

Thermal

BOOT

REG

VOUT

VOUT

VIN

VOUT

VIN

PWM

Comparator

REF

Soft

start

Current limit

trigger

TOFF

MODE

VIN

LS Driver

HS Driver

VBIAS

SCL

SDA

ADDR

I

2C Control

I

2C Control

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TPS61371

SLVSI31 – APRIL 2026

Copyright © 2026 Texas Instruments Incorporated

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