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TPS61042DRBR Datasheet(PDF) 1 Page - Texas Instruments

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Part # TPS61042DRBR
Description  CONSTANT CURRENT LED DRIVER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS61042DRBR Datasheet(HTML) 1 Page - Texas Instruments

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FEATURES
DESCRIPTION
APPLICATIONS
VIN
CTRL
SW
OVP
GND
L1
4.7 mH
Rs
13 W
D1
Vin
1.8 V to 6 V
FB
LED
RS
Enable/PWM Brightness Control
100 Hz to 50 kHz
CO†
100 nF
Cin
4.7 mF
3
5
6
4
8
7
1
2
TPS61042
SLVS441C – DECEMBER 2002 – REVISED MARCH 2007
CONSTANT CURRENT LED DRIVER
• Current Source With Overvoltage Protection
The TPS61042 is a high frequency boost converter
with constant current output that drives white LEDs
• Input Voltage Range . . 1.8 V to 6 V
or similar. The LED current is set with the external
• Internal 30 V Switch
sense resistor (RS) and is directly regulated by the
• Up to 85% Efficiency
feedback pin (FB) that regulates the voltage across
• Precise Brightness Control Using PWM Signal
the sense resistor RS to 252 mV (typ). To control
LED brightness, the LED current can be pulsed by
or Analog Signal
applying a PWM (pulse width modulated) signal with
• Switching Frequency . . Up to 1 MHz
a frequency range of 100 Hz to 50 kHz to the control
• Internal Power MOSFET Switch . . 500 mA
pin (CTRL). To allow higher flexibility, the device can
be configured where the brightness can be controlled
• Operates With Small Output Capacitors Down
by an analog signal as well, as described in the
to 100 nF
application information section. To avoid possible
• Disconnects LEDs During Shutdown
leakage currents through the LEDs during shutdown,
• No Load Quiescent Current . . 38 µA Typ
the control pin (CTRL) disables the device and
disconnects the LEDs from ground. For maximum
• Shutdown Current . . 0.1 µA Typ
safety during operation, the output has integrated
• Available in a Small 3 mm × 3 mm QFN
overvoltage protection that prevents damage to the
Package
device in case of a high impedance output (e.g.
faulty LED).
• White LED Supply for Backlight/Sidelight
Displays
PDA, Pocket PC, Smart Phones
Handheld Devices
Cellular Phones
† Larger output capacitor values like 1 µF and larger, reduce the LED ripple current and improve line regulation.
Figure 1. Typical Application
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.
Copyright © 2002–2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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