TPS61061 Datasheet, PDF (1/22 Pages) Texas Instruments – CONSTANT CURRENT LED DRIVER WITH DIGITAL AND PWM BRIGHTNESS CONTROL

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TPS61060
TPS61061
TPS61062
SLVS538 – NOVEMBER 2004
CONSTANT CURRENT LED DRIVER WITH DIGITAL AND PWM BRIGHTNESS CONTROL
FEATURES
• LED Driver With Integrated Overvoltage and
Short-Circuit Protection
• 2.7-V to 6.0-V Input Voltage Range
• 500-mV/250-mV Feedback Voltage
• TPS61060 Powers Up to 3 LEDs
• TPS61061 Powers Up to 4 LEDs
• TPS61062 Powers Up to 5 LEDs
• PWM Brightness Control on Enable
• Digital Brightness Control on ILED
• 1.0-MHz Fixed Switching Frequency
• 400-mA Internal Power MOSFET Switch
• LEDs Disconnected During Shutdown
• Operates With Small-Output Capacitors
Down to 220 nF
• Up to 80% Efficiency
• 8-Pin NanoFree™Package (Chipscale, CSP)
• 3 × 3-mm QFN Package
APPLICATIONS
• White LED Driver
• Cellular Phones
• PDA, Pocket PC, and Smart Phones
• Digital Still Camera
• Handheld Devices
DESCRIPTION
The TPS61060/61/62 is a high-frequency, synchronous boost converter with constant current output to drive up
to 5 white LEDs. For maximum safety, the device features integrated overvoltage and an advanced short-circuit
protection when the output is shorted to ground. The device operates with 1-MHz fixed switching frequency to
allow small external components and to simplify possible EMI problems. The device comes with three different
overvoltage protection thresholds (14 V/18 V/23 V) to allow inexpensive and small-output capacitors with lower
voltage ratings. The LED current is initially set with the external sense resistor Rs, and the feedback voltage is
regulated to 500 mV or 250 mV, depending on the ILED pin configuration. Digital brightness control is
implemented by applying a simple digital signal to the ILED pin. Alternatively, a PWM signal up to 1 kHz can be
applied to the enable pin to control the LED brightness. During shutdown, the output is disconnected from the
input to avoid leakage current through the LEDs.
TYPICAL APPLICATION
VIN
2.7 V to 6 V
C1
1 mF
L1
22 mH
VIN
SW
EN OUT
ILED FB
GND PGND
C2
220 nF
R_S
12 W
Figure 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.
NanoFree, PowerPAD are trademarks of Texas Instruments.
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 © 2004, Texas Instruments Incorporated