LM3556_15 Datasheet, PDF (3/39 Pages) Texas Instruments – Synchronous Boost LED Flash Driver With High-Side Current Source

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5 Pin Configuration And Functions
YFQ Package
16-Pin DSBGA
Top View
A1
A2
A3
A4
B1
B2
B3
B4
C1
C2
C3
C4
D1
D2
D3
D4
LM3556
SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015
NUMBER
A1, B1
PIN
NAME
LED
B2, A2
B3, A3
A4, B4
C1
OUT
SW
GND
TEMP
C2
TORCH
C3
STROBE
C4
IN
D1
TX
D2
SDA
D3
SCL
D4
ENABLE
TYPE
Power
Power
Power
Ground
Power
Power
I/O
Input
I/O
I/O
Input
Power
Pin Functions
DESCRIPTION
High-side current source output for flash LED. Both pins must be connected for proper
operation.
Step-up DC-DC converter output. Connect a 10-µF ceramic capacitor between this pin
and GND.
Drain connection for internal NMOS and synchronous PMOS switches.
Ground
Threshold detector for LED temperature sensing and current scale back.
Active high hardware torch enable. Drive TORCH high to turn on Torch or Movie mode.
Used for external PWM Mode. Has an internal pulldown resistor of 300 kΩ between
TORCH and GND.
Active high hardware flash enable. Drive STROBE high to turn on flash pulse. STROBE
overrides TORCH. Has an internal pulldown resistor of 300 kΩ between STROBE and
GND.
Input voltage connection. Connect IN to the input supply, and bypass to GND with a 10-
µF or larger ceramic capacitor.
Configurable dual polarity power amplifier synchronization input. Has an internal pulldown
resistor of 300 kΩ between TX and GND.
Serial data input/output.
Serial clock input.
Active high enable pin. High = standby, low = shutdown/reset. There is no internal
pulldown resistor on this pin.
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