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LM3535
Multi-Display LED Driver with Ambient Light Sensing and Dynamic Backlight Control Compatibility
D1A
D2AD3AD4A
INT
GROUP A GROUP C
VIO
VIN
VOUT
Diode Current External PWM Inputfor Dynamic Backlight Control Multi-Zone Ambient Light Sensing (ALS) ALS Interrupt Reporting Independent On/Off ControlforAll Current Sinks 128 Exponential Dimming Steps With 600:1
Dimming Ratio for GroupA (Upto6 LEDs) 8 Linear Dimming Statesfor GroupsB (Upto3
LEDs) and D1C(1 LED) Programmable Auto-Dimming Function Upto 90% Efficiency 0.55% Accurate Current Matching Wide Input Voltage Range (2.7Vto 5.5V) Active High Hardware Enable Total Solution Size<16 mm2 Low Profile 20-Pin DSBGA Package
Applications Smart-Phone LED Backlighting Large Format LCD Backlighting General LED Lighting
applications. Independent LED control allows
selectionofa subsetof the6 main display LEDs
partial-illumination applications. In addition to
main bankof6, the LM3535is capableof driving
additional2 independently controlled LEDsto support
Indicator applications.
The LED driver current sinks are split into three
independently controlled groups. The primary group
can be configuredto drive upto six LEDs for usein
the main phone display. Groups B and
provided for driving secondary displays, keypads
indicator LEDs.Allof the LED current sources
independently turned on andoff providing
address different application requirements.
The LM3535 provides multi-zone ambient light
sensing allowing autonomous backlight intensity
control in the event of changing ambient light
conditions.A PWM inputis also providedto give the
user the means to adjust the backlight intensity
dynamically based upon the contentof the display.
The LM3535 provides excellent efficiency without the
useof an inductorby operating the charge pumpina
gainof 3/2orin pass mode. The proper gain for
maintaining current regulationis chosen, based on
LED forward voltage, so that efficiencyis maximized
over the input voltage range.
The LM3535is availableina tiny 20-pin, 0.4-mm
pitch, thin DSBGA package.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Typical Application
