LM3537_13 Datasheet, PDF (1/33 Pages) Texas Instruments – 8-Channel WLED Driver with Four Integrated LDOs

LM3537
www.ti.com
SNVS634B – JUNE 2011 – REVISED MAY 2013
LM3537 8-Channel WLED Driver with Four Integrated LDOs
Check for Samples: LM3537
FEATURES
1
2Lighting:
• 8-channel Backlight Capability
• Internal ALS Engine; PWM Input to Support
CABC
• Built-In Power Supply and Gain Control for
Ambient Light Sensor
• Up to 90% Efficiency
• Adaptive Charge Pump with 1x and 1.5x
Ggains for Maximum Efficiency
• 128 Dimming Steps for Group A, Exponential
or Linear Dimming Selectable by Register
Setup
• 8 Linear Dimming States for Group B
LDOs:
• 4 Programmable LDOs (300 mA/150 mA Output
Currents)
• Default Startup Voltage States
• Low Dropout Voltage: 100 mV typ. at 150 mA
Load Current
• LDO Input Voltage = 1.8V to V_{IN_A}
• Overload Protection
Combined Common Features:
• Wide Input Voltage Range: 2.7V to 5.5V
• I²C-Compatible Serial Interface
• 2 General-Purpose Outputs
APPLICATIONS
• Smartphone Lighting
• MP3 Players, Gaming Devices
• Digital Cameras
DESCRIPTION
The LM3537 is a highly integrated LED driver
capable of driving 8 LEDs in parallel for single display
backlighting applications. Independent LED control
allows for a subset of the main display LEDs to be
selected for partial illumination applications.
Typical Application Circuit
V_IN = 2.7 to 5.5V
C_{IN_A}
1 PF
C_{IN_B}
100 nF
C_{IN_C}
2.2 PF
MCU
C_SEN
AMBIENT 1 PF
+- _LIGHT
SENSOR
C₁
1 PF
C₂
1 PF
C1+ C1- C2+ C2- VOUT
VIN_A
D1
D2
VIN_B
D3
C_OUT
1 PF
D4
VIN_C
D5
SCL
SDA
HWEN
LM3537
PWM
SBIAS
GPO1
GPO2
ALS
GNDs
D6
D7/
INT
D8
LDO1
LDO2
LDO3
LDO4
C_LDO1 1 PF
C_LDO2 1 PF
C_LDO3 1 PF
C_LDO4 1 PF
1
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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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