8 Detailed Description

8.1 Overview

The TPS61033 is a fully-integrated synchronous boost converter and operates from an input voltage supply

range from 1.8 V to 5.5 V with 5.5-A (typical) valley switch current limit. The TPS61033 operates at 2.4-MHz

switching frequency. There are two optional modes at light load by configuring the MODE pin: auto PFM mode

and forced PWM to balance the efficiency and noise immunity in light load. The TPS61033 consumes an 20-μA

quiescent current from VIN at light load condition. During shutdown, the TPS61033 is completely disconnected

from the input power and only consumes a 0.1-μA current to achieve long battery life. During PWM operation,

the converter uses adaptive constant on-time valley current mode control scheme to achieve excellent line

regulation and load regulation and allows the use of a small inductor and ceramic capacitors. Internal loop

compensation simplifies the design process while minimizing the number of external components.

8.2 Functional Block Diagram

8

7

1

2

SW

EN

FB

VOUT

VIN

VREF

5

6

GND

VOUT

VOUT

VIN

3

MODE

4

PG

Valley Current

Sense

So Startup

PWM Control

Gate Driver

Undervoltage

Lockout

Logic

Thermal

Shutdown

Over Voltage

and Short

Circuit

Protec on

PGOOD

+

–

EA

TPS61033

SLVSGI6 – OCTOBER 2022

www.ti.com

10

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