LM3535 Datasheet, PDF (1/34 Pages) National Semiconductor (TI) – Multi-Display LED Driver with Ambient Light Sensing and Dynamic Backlight Control Compatibility

LM3535
www.ti.com
SNVS598A – AUGUST 2010 – REVISED MAY 2013
LM3535 Multi-Display LED Driver with Ambient Light Sensing and Dynamic Backlight
Control Compatibility
Check for Samples: LM3535
FEATURES
1
•2 Drives Up to 8 LEDs With Up to 25mA of Diode
Current Each
• External PWM Input For Dynamic Backlight
Control
• Multi-Zone Ambient Light Sensing (ALS)
• Dual-ALS Sensor Inputs (LM3535-2ALS Only)
• ALS Interrupt Reporting
• Independent On/Off Control for All Current
Sinks
• 128 Exponential Dimming Steps with 600:1
Dimming Ratio for Group A (Up to 6 LEDs)
• 8 Linear Dimming States for Groups B (Up to 3
LEDs) and D1C (1 LED)
• Programmable Auto-Dimming Function
• Up to 90% Efficiency
• 0.55% Accurate Current Matching
• Internal Soft-Start Limits Inrush Current
• True Shutdown Isolation for LEDs
• Wide Input Voltage Range (2.7V to 5.5V)
• Active High Hardware Enable
• Total Solution Size < 16mm²
• Low Profile 20 Bump DSBGA Package
(1.650mm × 2.055mm × 0.6mm)
APPLICATIONS
• Smart-Phone LED Backlighting
• Large Format LCD Backlighting
• General LED Lighting
DESCRIPTION
The LM3535 is a highly integrated LED driver
capable of driving 8 LEDs in parallel for large display
applications. Independent LED control allows for a
subset of the 6 main display LEDs to be selected for
partial illumination applications. In addition to the
main bank of 6, the LM3535 is capable of driving an
additional 2 independently controlled LEDs to support
Indicator applications.
The LED driver current sinks are split into three
independently controlled groups. The primary group
can be configured to drive up to six LEDs for use in
the main phone display. Groups B and C are
provided for driving secondary displays, keypads and
indicator LEDs. All of the LED current sources can be
independently turned on and off providing flexibility to
address different application requirements.
Typical Application Circuit
GROUP A
GROUP B
GROUP C
VIO
1 µF
1 µF
1 µF
OR
VIO
D1A D2A D3A D4A
D53
D62 D1B/ D1C/
VIN
INT
ALSA
ALSB
C1+
LM3535-2ALS
VOUT
C1-
C2+
1 µF
GND
C2-
HWEN SDIO SCL PWM
I²C Control
Signals
Figure 1.
Figure 2. Minimum Layout
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2
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.
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