TPS61160 Datasheet, PDF (1/21 Pages) Texas Instruments – White LED Driver With Digital and PWM Brightness Control in 2mm x 2mm QFN Package for up to 10 LEDs in Series

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TPS61160
TPS61161
SLVS791 – NOVEMBER 2007
White LED Driver With Digital and PWM Brightness Control in 2mm x 2mm
QFN Package for up to 10 LEDs in Series
FEATURES
1
• 2.7V to 18V Input Voltage Range
• 26V Open LED Protection for 6 LEDs
(TPS61160)
38V Open LED Protection for 10 LEDs
(TPS61161)
• 200mV Reference Voltage With ±2% Accuracy
• Flexible Digital and PWM 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
TPS61160/1 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 using the 1 wire digital interface
(Easyscale™ protocol) through the CTRL pin.
Alternatively, a pulse width modulation (PWM) signal
can be applied to the CTRL pin through which the
duty cycle determines the feedback reference
voltage. In either digital or PWM mode, the
TPS61160/1 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 TPS61160/1 to prevent the output from exceeding
the absolute maximum ratings during open LED
conditions.
The TPS61160/1 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
TPS61161
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 TPS61161
1
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 © 2007, Texas Instruments Incorporated