TPS61160A Datasheet, PDF (1/20 Pages) Texas Instruments – White LED Driver With PWM Brightness Control in 2mm x 2mm QFN Package for up to 10 LEDs in Series

TPS61160A
TPS61161A
www.ti.com................................................................................................................................................................................................... SLVS937 – MARCH 2009
White LED Driver With PWM Brightness Control in 2mm x 2mm
QFN Package for up to 10 LEDs in Series
FEATURES
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• 2.7V to 18V Input Voltage Range
• 26V Open LED Protection for 6 LEDs
(TPS61160A)
38V Open LED Protection for 10 LEDs
(TPS61161A)
• 200mV Reference Voltage With ±2% Accuracy
• PWM Interface for Brightness Control
• Built-in Soft Start
• Up to 90% Efficiency
• 2mm × 2mm × 0.8mm 6-pin QFN Package With
Thermal Pad
APPLICATIONS
• Cellular Phones
• Portable Media Players
• Ultra Mobile Devices
• GPS Receivers
• White LED Backlighting for Media Form Factor
Display
DESCRIPTION
With a 40-V rated integrated switch FET, the
TPS61160A/61A is a boost converter that drives up
to 10 LEDs in series. The boost converter runs at
600kHz fixed switching frequency to reduce output
ripple, improve conversion efficiency, and allows for
the use of small external components.
The default white LED current is set with the external
sensor resistor Rset, and the feedback voltage is
regulated to 200mV, as shown in the typical
application. During the operation, the LED current can
be controlled by a pulse width modulation (PWM)
signal applied to the CTRL pin through which the duty
cycle determines the feedback reference voltage. In
PWM dimming mode, the TPS61160A/61A does not
burst the LED current; therefore, it does not generate
audible noises on the output capacitor. For maximum
protection, the device features integrated open LED
protection that disables the TPS61160A/61A to
prevent the output from exceeding the absolute
maximum ratings during open LED conditions.
The TPS61160A/61A is available in a space-saving,
2mm × 2mm QFN package with thermal pad.
V_I 3 V to 18 V
L1
22 mH
D1
C1
1 mF
ON/OFF
DIMMING
CONTROL
C3
220 nF
TPS61161A
VIN SW
CTRL FB
COMP GND
C2
1 mF
R_set
10 W
L1: TDK VLCF5020T-220MR75-1
C1: Murata GRM188R61E105K
C2: Murata GRM21BR71H105K
D1: ONsemi MBR0540T1
20 mA
Figure 1. Typical Application of TPS61161A
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated