APPLICATION INFORMATION

APPLICATION OVERVIEW

VBUS

GND

CP-

VIN

VOUT

GND

CP+

ENA

USB

Transceiver

Controller

Comparator

D+

ID

D-

VIN=2.7V-5.5V

C3

2.2 F

m

C1

2.2 F

m

C2

1 F

m

5V

50mA (VIN>2.7V)

140mA (VIN>3.3V)

CP-

VIN

VOUT

GND

CP+

ENA

ENABLE

VIN=2.7V~5.5V

C3

2.2 F

m

C1

2.2 F

m

C2

1 F

m

50mA (VIN>2.7V)

140mA (VIN>3.3V)

BASIC OPERATION PRINCIPLE

TPS60151

Most of today’s battery-powered portable electronics allow and/or require data transfer with a PC. One of the

fastest data transfer protocols is via USB On the Go (OTG). As Figure 20 shows, the USB OTG circuitry in the

portable device requires a 5-V power rail and up to 140mA of current. The HDMI specification calls for a 5-V

power rail that can source 55mA or more current. The TPS60151 may be utilized to provide a 5-V power rail in a

battery powered system.

Alternatively, low-cost portable electronics with small LCD displays require a low-cost solution for providing the

WLED backlight. As shown in Figure 21, the TPS60151 can also be used to drive several WLEDs in parallel, with

the help of ballast resistors.

Figure 20. Application Circuit for OTG System

Figure 21. Application Circuit for Driving White LEDs

The TPS60151, regulated charge pump, provides a regulated output voltage for various input voltages. The

TPS60151 regulates the voltage across the flying capacitor to 2.5V and controls the voltage drop of Q1 and Q2

while a conversion clock with 50% duty cycle drives the FETs.

Copyright © 2009, Texas Instruments Incorporated

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