SW

PGND

OVP

VIN

ISET

L1

4.7uH

D1

IFB1

IFB2

IFB3

IFB4

IFB5

IFB6

GND

C1

2.2uF

C2

4.7uF

R1

51k

VIN

C3

1uF

2.7V ~ 6.5V

Up to 38V

COMP

C4

0.47uF

PWM / EN

PWM

MODE / FAULT

R2

1.3M

VLDO

TPS61176

R3

1M

R4

43k

TPS61176

www.ti.com

SLVSBM5 – DECEMBER 2012

High-Efficiency 6-Channel WLED Driver Supporting Single-Cell Li-Ion Battery Input

Check for Samples: TPS61176

1

FEATURES

DESCRIPTION

The TPS61176 is a highly integrated multi-channel

•

2.7V to 6.5V VIN Voltage Range

WLED backlight driver for tablet or notebook PCs,

•

2.7V to 24V Boost Input Voltage Range

which can support single-cell battery input directly. It

•

Integrated 2A/40V MOSFET

comprises a high efficient boost converter with an

integrated 2A/40V power MOSFET and six current

•

1MHz Switching Frequency

sink regulators. In total, the device can drive up to 60

•

Adaptive Boost Output to WLED Voltages

WLEDs with high current matching performance. In

•

Six Current Sinks of 35mA Capability Each

addition, the boost automatically adjusts its output

voltage to the WLED forward voltage to improve

•

±2% (Max) Current Accuracy

efficiency.

•

1.3% (Typ) Current Matching

TPS61176

adopts

mixed

dimming

mode.

The

•

Wide PWM Dimming Frequency Range

automatic switch between PWM dimming at low

–

from 100Hz to 22kHz

dimming duty cycle and analog dimming at high

•

Mixed Dimming Mode: Automatic Switch

dimming duty cycle increases the overall electrical-to-

between Analog Dimming and PWM Dimming

optical efficiency, reducing the power budget for

backlight remarkably. The switch point can be

–

Programmable Switch Point: 25% / 12.5%

programmed to 12.5% or 25% and the PWM dimming

–

Programmable PWM Dimming Mode: 22kHz

mode

can

be

programmed

to

fixed

frequency

PWM Dimming / Direct PWM Dimming

dimming or direct PWM dimming. TPS61176 supports

•

Up to 14-bit Dimming Resolution

up

to

14-bit

dimming

resolution,

which

avoids

potential

flickering

perception

during

the

low

•

Support down to 1% Dimming Duty Cycle

brightness dimming.

•

Input PWM Glitch Filter

By providing a driver for an external isolation P-

•

Up to 90% Efficiency

channel

MOSFET,

TPS61176

can

support

true

•

Driver for Input / Output Isolation PFET for

shutdown. When the IC is disabled or the boost

True Shutdown

output is short to ground, the isolation PFET can be

•

Built-in Soft Start

turned off to cut off the power path from battery to the

WLEDs, preventing any leakage current from the

•

Built-in WLED Open / Short Protection

battery. TPS61176 also integrates soft start, WLED

•

Thermal Shutdown

open and short protection and thermal shut down.

•

Support 4.7µH Inductor

TPS61176 is in a 16 pin 3mm x 3mm QFN package,

•

16L 3 mm x 3 mm QFN package

providing

a

space-saving

and

high-performance

WLED driver solution.

APPLICATIONS

TYPICAL APPLICATION

•

Tablet Backlight

•

Notebook Backlight

•

Backlight for Small and Media Form Factor

LCD Display with Single-Cell or Multi-Cell

Battery Input

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.

Copyright © 2012, 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.