TPS61176_15 Datasheet, PDF (1/34 Pages) Texas Instruments – High-Efficiency 6-Channel WLED Driver Supporting Single-Cell Li-Ion Battery Input

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TPS61176
SLVSBM5B – DECEMBER 2012 – REVISED AUGUST 2015
TPS61176 High-Efficiency 6-Channel WLED Driver
Supporting Single-Cell Li-Ion Battery Input
1 Features
•1 2.7-V to 6.5-V V_IN Voltage Range
• 2.7-V to 24-V Boost Input Voltage Range
• Integrated 2-A/40-V MOSFET
• 1-MHz Switching Frequency
• Adaptive Boost Output to WLED Voltages
• Six Current Sinks of 35 mA Capability Each
• ±2% (Maximum) Current Accuracy
• 1.3% (Typical) Current Matching
• 100-Hz to 22-kHz Input PWM Frequency
• Mixed Dimming Mode: Automatic Switch Between
Analog Dimming and PWM Dimming
– Programmable Switch Point: 25% or 12.5%
– Programmable PWM Dimming Mode: 22-kHz
PWM Dimming, Direct PWM Dimming
• Up to 14-bit Dimming Resolution
• Support Down to 1% Dimming Duty Cycle
• Input PWM Glitch Filter
• Up to 90% Efficiency
• Driver for Input and Output Isolation PFET for
True Shutdown
• Built-in WLED Open and Short Protection
• Thermal Shutdown
2 Applications
Backlight for Small and Media Form Factor LCD
Display with Single-Cell or Multi-Cell Battery Input
3 Description
The TPS61176 is an integrated WLED backlight
driver for tablets or notebook PCs using single-cell
batteries. It comprises a high-efficiency boost
converter with an integrated 2-A, 40-V power
MOSFET, and six current sink regulators. The device
can drive up to 60 WLEDs. The boost output voltage
automatically adjusts to the WLED forward voltage to
improve efficiency.
The TPS61176 supports mixed dimming mode. The
automatic switch between PWM dimming and analog
dimming increases the overall electrical-to-optical
efficiency, reducing power of the backlight
significantly. The switch point can be programmed to
12.5% or 25%. PWM dimming mode can also be
programmed to fixed frequency dimming or direct
PWM dimming. The device supports up to 14-bit
dimming resolution to avoid potential flickering during
low brightness dimming.
True shutdown is supported with a driver for an
external isolation P-channel MOSFET. When the
device is disabled or the boost output is shorted to
ground, the isolation PFET is turned off to cut off the
power path from battery preventing any leakage
current from the battery. The device also integrates
soft start, thermal shutdown, WLED open and short
protection. Its 16-pin WQFN package provides a
space-saving and high-performance WLED driver
solution.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61176
WQFN (16)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
2.7V ~ 6.5V
VIN
C1
2.2uF
R2
1.3M
C3
1uF
PWM
R1
51k
Typical Application
L1
4.7uH
D1
Up to 38V
C2
SW 4.7uF
MODE / FAULT
PGND
R3
1M
OVP
VIN
R4
TPS61176
43k
VLDO
PWM / EN
ISET
GND
IFB1
IFB2
IFB3
IFB4
IFB5
IFB6
COMP
C4
0.47uF
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.