TPS61158 Datasheet, PDF (1/27 Pages) Texas Instruments – 30V WLED Driver with Integrated Power Diode

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30V WLED Driver with Integrated Power Diode
Check for Samples: TPS61158
TPS61158
SLVSBR3 – MAY 2013
FEATURES
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• 2.7V to 5.5V Input Voltage Range
• 28V Open LED Protection (up to 8 LEDs)
• Integrated 0.6A 30V Internal Switch FET and
Power Diode
• 750kHz Switching Frequency
• Flexible Digital and PWM Brightness Control
– 1-Wire Control Interface (EasyScale)
– PWM Dimming Control Interface
• Up to 100:1 PWM Dimming Ratio
• Integrated Loop Compensation
• Built-in Soft Start
• Built-in WLED Open protection
• Thermal Shutdown
• 2mm x 2mm x 0.8mm 6-pin QFN Package with
Thermal Pad
APPLICATIONS
• Feature Phones
• Smart Phones
• Portable Media Players
• Ultra Mobile Devices
• GPS Receivers
• Backlight for Small and Media Form Factor
LCD Display
DESCRIPTION
With 30V rated integrated switch FET and power
diode, the TPS61158 is a boost converter that drives
LEDs in series. The boost converter runs at 750kHz
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 RFB, 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
TPS61158 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 TPS61158 to prevent the output voltage from
exceeding the IC's absolute maximum voltage ratings
during open LED conditions. The TPS61158 is
available in a space-saving, 2mm × 2mm QFN
package with thermal pad.
TYPICAL APPLICATION
2.7V ~ 5.5V
VBAT
Cin
2.2µF
L
22µH
TPS61158
VIN
LX
Up to 8 LEDs
Cout
1µF
PWM or 1-wire
dimming control
CTRL VOUT
GND
FB
RFB
10
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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 © 2013, Texas Instruments Incorporated