LM3537_13 Datasheet, PDF (12/33 Pages) Texas Instruments – 8-Channel WLED Driver with Four Integrated LDOs

LM3537
SNVS634B – JUNE 2011 – REVISED MAY 2013
BLOCK DIAGRAM
V_IN
2.7V to 5.5V
V_{IN_A}
C_IN
1 PF
SCL
SDA
HWEN
PWM
2.4V or
3.0V
SBIAS
C_SEN
1 PF
GPO1
AMBIENT
+-
LIGHT _GPO2
SENSOR
ALS
SERIAL
DATA
SENSOR
POWER
INT
ALS ENGINE
R_ALS
1 PF
C1+ C1-
1 PF
C2+ C2-
SOFT-
START
VREF
1.25V
CHARGE PUMP
1X/1.5X
1.3 MHz
OSC
GAIN
CONTROL
GROUP B
BRIGHTNESS
CTRL = 8 STEPS
REGISTERS
POR
CONTROL
GROUP A
BRIGHTNESS
CTRL = 128 STEPS
PWM
THERMAL
SHUTDOWN
LDO 1
V_{IN_B}
C_{IN_B}
100 nF
V_{IN_C}
C_{IN_C}
2.2 PF
VOLTAGE REFERENCE
WITH NOISE
SUPPRESSION FILTER
LDO 2
LDO 3
LDO 4
GNDs
www.ti.com
V_OUT
C_OUT
1 PF
D1
D2
D3
D4
D5
D6
D7/
INT
D8
LDO1
C_LDO1
1 PF
LDO2
C_LDO2
1 PF
LDO3
C_LDO3
1 PF
LDO4
C_LDO4
1 PF
12
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