LM3556 datasheet(3/38 Pages) TI2

3 / 38 page

LM3556

www.ti.com

SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015

5 Pin Configuration And Functions

YFQ Package

16-Pin DSBGA

Top View

Pin Functions

TYPE

DESCRIPTION

NUMBER

NAME

High-side current source output for flash LED. Both pins must be connected for proper

A1, B1

LED

Power

operation.

Step-up DC-DC converter output. Connect a 10-µF ceramic capacitor between this pin

B2, A2

OUT

Power

and GND.

B3, A3

Power

Drain connection for internal NMOS and synchronous PMOS switches.

A4, B4

GND

Ground

TEMP

Power

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.

TORCH

Power

Used for external PWM Mode. Has an internal pulldown resistor of 300 k

Ω between

TORCH and GND.

Active high hardware flash enable. Drive STROBE high to turn on flash pulse. STROBE

STROBE

I/O

overrides TORCH. Has an internal pulldown resistor of 300 k

Ω between STROBE and

GND.

Input voltage connection. Connect IN to the input supply, and bypass to GND with a 10-

Input

µF or larger ceramic capacitor.

Configurable dual polarity power amplifier synchronization input. Has an internal pulldown

I/O

resistor of 300 k

Ω between TX and GND.

SDA

I/O

Serial data input/output.

SCL

Input

Serial clock input.

Active high enable pin. High = standby, low = shutdown/reset. There is no internal

ENABLE

Power

pulldown resistor on this pin.

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