8 Detailed Description

8.1 Overview

The TPS61376 is a high voltage non-synchronous boost converter with input average current limit and load

disconnect functions. The input average current limit threshold can be programmed through the ILIM pin from

0.1 A to 3.0 A. The isolation FET between the VP and SW pin will completely cut off the path between input

and output when the device is disabled. The TPS61376 has a wide input voltage range from 2.9 V to 23 V and

output voltage covers up to 25 V. The TPS61376 implements the peak current mode with the adaptive off-time

control topology. When the ISEL pin is logic high, the peak switching current limit is 4.5 A(typ). When the ISEL

pin is logic low, the peak switching current limit will change form 4.5 A(typ) to 2.5 A(typ). The device works in

PWM mode at moderate to heavy load conditions. At the light load conditions, the device enters PFM mode

to maintain high efficiency over the entire load current range. The TPS61376 also integrates robust protection

features including output overvoltage protection, cycle-by-cycle overcurrent protection and thermal shutdown.

8.2 Functional Block Diagram

ILIM

VIN UVLO

FB

L1

VCC

Regulator

VIN

BST

VCC

Thermal

VIN

COMP

ISEL

VIN

VOUT

EN/UVLO

VOUT

RUVLOB

RUVLOT

VCC

+

–

GM

VREF

R

Q

Q

S

VSENSE

PWM

Comparator

PWM

PWM

CCOMP

RCOMP

CIN

CVCC

COUT

RFBB

RFBT

TSD

SW

1/K

VIN

Input Current

Limit

Soft

Start

ILIM

SW

VP

VCC

CBST

BST

TOFF

TOFF

TOFF

VOUT

OVP

ILIM

VREF

PGND

AGND

Level

Shi

Input Current

Limit

Logic Core

8.3 Feature Description

8.3.1 VCC Power Supply

The internal LDO of TPS61376 outputs a regulated voltage of 4.8 V with 10-mA output current capability. When

the input voltage at the VIN pin is below 5.25 V, the internal LDO is powered by the VOUT pin, when the input

voltage at the VIN pin is above 5.5 V, the internal LDO is powered by the VIN pin. A ceramic capacitor is

connected between the VCC pin and AGND pin to stabilize the VCC voltage and also decouple the noise on the

VCC pin. The value of this ceramic capacitor should be above 1 µF. A ceramic capacitor with an X7R or X5R

grade dielectric with a voltage rating higher than 10 V is recommended.

TPS61376

SLVSGQ1A – JANUARY 2022 – REVISED SEPTEMBER 2022

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