IW7023 Datasheet, PDF (1/35 Pages) Dialog Semiconductor – 16-Channel LED Driver for LCD Panel Backlighting

iW7023
16-Channel LED Driver for LCD Panel Backlighting
1.0 Features
2.0 Description
●● 16-channel LED driver, 60V (max) per channel
●● V_IN: 9V to 28V
●● Fully-integrated current-sink FETs with minimum
external components
●● Two dynamic external boost or buck controller interfaces
to optimize system power efficiency
●● Patented BroadLED™ digital adaptive switch mode
technology for high current matching at maximum
efficiency
xx Channel-to-channel matching accuracy ±2%
xx Enables use of cheaper, loosely binned LED arrays
for lower BOM cost
●● High-speed PWM dimming via SPI interface
xx High-bandwidth PWM-based dynamic local dimming
xx PLL-locked VSYNC synchronized PWM
xx Dimming range: 1% to 99.9%, 12-bit resolution
xx Dimming frequency support for NTSC, PAL and 3D
game modes with 5-bit programmability in normal
mode (controlled by SPI dimming interface)
●● Direct and unsynchronized dimming via external PWM
●● Per-channel current
xx Up to 150mA average
xx Up to 240mA peak
●● Comprehensive protection features:
xx LED open and short-circuit fault protection
The iW7023 is a high efficiency driver for LEDs. It is designed
for use with mid-size LCD panels that use arrays of LEDs as
a backlight source. It is able to communicate with up to one
external step-up or step-down PWM DC-DC converter to
drive up to 16 separate strings of multiple series-connected
LEDs.
The iW7023 features dynamic output voltage control, which
automatically chooses the lowest active LED source voltage
to adjust the feedback voltage of a step-up or step-down
converter. Through this function, the iW7023 is able to
dynamically adjust the output voltage of up to two external
step-up or step-down converters to optimize the system
power efficiency.
The iW7023 also provides 16 constant current sinks with
maximum ±2% current matching. The LED PWM dimming
can be adjusted dynamically through a high bandwidth SPI
interface, which provides users flexibility to control the light
intensity of LEDs. In addition, users can provide versatile
configurations of the iW7023 through SPI interface registers.
The iW7023 can maintain very high efficiency even with the
existence of LED channel total forward voltage mismatch,
with the proprietary digital power management and patent
pending adaptive switch mode LED current regulation
technology.
The iW7023 has multiple features to protect the LED
channels from fault conditions, and these protections are
LED PWM cycle-by-cycle based to ensure system reliability
and provide consistent operation.
3.0 Applications
xx Over-temperature shutdown
●● Direct & Segment-Edge LED Backlit LCD TV
●● 48-lead QFN-7m-48L package
●● Edge Type global dimming LED backlit LCD TV
●● Medical, Industrial Monitors and Public Displays
iW7023
Datasheet
Rev. 1.0
1 of 35
© 2015 Dialog Semiconductor (UK) Ltd.