Datasheet

APPLICATION INFORMATION
APPLICATION OVERVIEW
VBUS
GND
CP-
VIN
VOUT
GND
CP+
ENA
USB
Transceiver
Controller
Comparator
D+
ID
D-
VIN=2.7V-5.5V
C3
2.2 Fm
C1
2.2 Fm
C2
1 Fm
5V
50mA (VIN>2.7V)
140mA (VIN>3.3V)
CP-VIN
VOUT
GND
CP+
ENA
ENABLE
VIN=2.7V~5.5V
C3
2.2 Fm
C1
2.2 Fm
C2
1 Fm
50mA (VIN>2.7V)
140mA (VIN>3.3V)
BASIC OPERATION PRINCIPLE
TPS60151
www.ti.com ......................................................................................................................................................................................... SLVSA02 – SEPTEMBER 2009
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.
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