TPS61169 Datasheet, PDF (1/24 Pages) Texas Instruments – High Current-Boost WLED Driver

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TPS61169
SNVSA40A – OCTOBER 2014 – REVISED MARCH 2016
TPS61169 38-V High Current-Boost WLED Driver
With PWM Control
1 Features
•1 2.7-V to 5.5-V Input Voltage
• Integrated 40-V, 1.8-A MOSFET
• Drives LED String up to 38 V
• 1.2-A Minimum Switch Current Limit
• 1.2-MHz Switching Frequency
• 204-mV Reference Voltage
• Internal Compensation
• PWM Brightness Control
• Open LED Protection
• Undervoltage Protection
• Built-in Soft-Start
• Thermal Shutdown
• Up to 90% Efficiency
2 Applications
• Smartphone Backlighting
• Tablet Backlighting
• PDAs, Handheld Computers, GPS Receivers
• Portable Media Players, Portable TVs
• White LED Backlighting for Small and Media
Form-Factor Displays
• Handheld Data Terminals (EPOS)
• Handheld Medical Equipment
• Thermostat Display
• Blood Glucose Meters
• Flashlights
• Refrigerators and Ovens
3 Description
With a 40-V rated integrated switch FET, the
TPS61169 is a boost converter that drives LEDs in
series. The boost converter has a 40-V, 1.8-A internal
MOSFET with minimum 1.2-A current limit; thus it can
drive single or parallel LED strings for small- to large-
size panel backlighting. The default white LED current
is set with the external sensor resistor, R_SET, and the
feedback voltage is regulated to 204 mV, as shown in
the Simplified Schematic. During the operation, the
LED current can be controlled by using a pulse width
modulation (PWM) signal applied to the CTRL pin,
through which the duty cycle determines the feedback
reference voltage. The TPS61169 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 TPS61169 to prevent the
output voltage from exceeding the absolute maximum
voltage ratings of the device during open LED
conditions.
The TPS61169 is available in a space-saving 5-pin
SC70 package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61169
SOT (5)
2.00 mm × 1.25 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Schematic
VBAT
L
D
CIN
TPS61169
COUT
VIN
SW
PWM DIMMING
CONTROL
CTRL
GND
FB
RSET
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.