LM3538_13 Datasheet, PDF (3/31 Pages) Texas Instruments – 6-Channel WLED Driver with Four Integrated LDOs

LM3538
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C5
E5
F5
B1
B3
A1
B2
E4
E3
E2
D5
F3
A2
F2
F4
E1
F1
C3
C4
D4
D3
D2
D1
C1
C2
B5
B4
A4
A3
A5
Name
V_{IN_A}
V_{IN_B}
V_{IN_C}
SCL
SDA
HWEN
PWM
SBIAS
GPO1
GPO2
ALS
GND
PGND
LDO4
LDO3
LDO2
LDO1
NC
INT
D6
D5
D4
D3
D2
D1
V_OUT
C2-
C2+
C1-
C1+
SNVS674A – JUNE 2011 – REVISED MAY 2013
PIN DESCRIPTIONS
Description
Input voltage for LED driver and sensor interface. Input range: 2.7V to 5.5V.
Input voltage for the regulators. This must be connected to the same voltage supply as
V_{IN_A}
Input voltage (power rail) for the LDO regulators. 1.8V ≤ V_{IN_C} ≤ V_{IN_A}
Serial interface clock
Serial interface data
Hardware enable pin. High = normal operation, low = RESET
External PWM Input - Allows the current sinks to be turned on and off at a frequency and
duty cycle externally controlled. Minimum on-time pulse width = 15µsec.
Power supply for a light sensor. Leave unconnected if not used.
General purpose output. Can be used as a sensor gain control signal. When functioning
as a general purpose output, it is open drain and requires an external pullup. Leave
unconnected if not used.
General purpose output. Can be used as a sensor gain control signal. When functioning
as a general purpose output, it is open drain and requires an external pullup. Leave
unconnected if not used.
Ambient Light Sensor input. Connect to ground if not used.
Regulator ground
LED driver and charge pump ground
Programmable V_OUT of 1.2-3.3 V. Max load = 150mA.
Programmable V_OUT of 1.2-3.3 V. Max load = 150mA.
Programmable V_OUT of 1.2-3.3 V. Max load = 150mA.
Programmable V_OUT of 1.2-3.3 V. Max load = 300mA.
Not Connected, keep floating.
ALS interrupt. A pullup resistor is required. A '0’ means a change has occurred, while a ‘1’
means no ALS adjustment has been made.
LED driver
LED driver
LED driver
LED driver
LED driver
LED driver
Charge pump output
Flying capacitor 2 negative terminal
Flying capacitor 2 positive terminal
Flying capacitor 1 negative terminal
Flying capacitor 1 positive terminal
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Copyright © 2011–2013, Texas Instruments Incorporated
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