9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The TPS61033 is a synchronous boost converter designed to operate from an input voltage supply range

between 1.8 V and 5.5 V with a 5.5-A (typical) valley switch current limit. The TPS61033 typically operates

at a quasi-constant 2.4-MHz frequency PWM at moderate-to-heavy load currents. At light load currents, the

TPS61033 converter operates in power-save mode with PFM to achieve high efficiency over the entire load

current range.

9.2 Typical Application

The TPS61033 provides a power supply solution for portable devices powered by batteries. With 5.5-A (typical)

switch current capability, the TPS61033 can output 5 V and 2 A from a single-cell Li-ion battery.

VIN

EN

SW

VOUT

FB

GND

L1

OFF

ON

C1

C2

1 µH

MODE

PFM

PWM

PG

FB connected to VIN

Fixed 5V Vout

VIN

Figure 9-1. Li-ion Battery to 5-V Boost Converter

9.2.1 Design Requirements

The design parameters are listed in Table 9-1.

Table 9-1. Design Parameters

PARAMETERS

VALUES

Input voltage

3.0 V to 4.35 V

Output voltage

5 V

Output current

2.0 A

9.2.2 Detailed Design Procedure

9.2.2.1 Setting the Output Voltage

The output voltage is set by an external resistor divider (R1, R2 in Figure 9-1). When the output voltage is

regulated, the typical voltage at the FB pin is VREF. Thus the resistor divider is determined by Equation 5.

TPS61033

SLVSGI6 – OCTOBER 2022

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