LM3559TLX National Semiconductor Corporation, LM3559TLX Datasheet - Page 3

• Manufacturer Part Number: LM3559TLX
• Description: Synchronous Boost Flash Driver With Dual 900 Ma High Side Current Sources 1.8a Total Flash Current
• Manufacturer: National Semiconductor Corporation

Pin Descriptions
A2, B2
A3, B3
A4, B4
Pin
A1
B1
C1
C2
C3
C4
D1
D2
D3
D4
TX2/INT/GPIO2
TX1/TORCH/
LEDI/NTC
STROBE
GPIO1
HWEN
Name
LED1
LED2
GND
OUT
SDA
SCL
SW
IN
High Side Current Source Output for Flash LED1.
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
High-Side Current Source Output for Flash LED2.
Configureable as a High-Side Current Source Output for Indicator LED or Comparator Input for
LED Temperature Sensing.
Configureable as a Dual-Polarity RF Power Amplifier Synchronization Input, a hardware Torch
mode enable, or as a General Purpose Logic I/O. This pin has an internal 300 kΩ pulldown to
GND.
Active High Hardware Flash Enable. Drive STROBE high to turn on the Flash current pulse. This
pin has an internal 300 kΩ pulldown to GND.
Input Voltage Connection. Connect IN to the input supply, and bypass to GND with a minimum 10
µF or larger ceramic capacitor.
Configurable as a Dual-Polarity Power Amplifier Synchronization Input, an Interrupt Output, or as
a General Purpose Logic I/O. This pin has an internal 300 kΩ pulldown to GND.
Serial Data Input/Output. High impedance in shutdown or in power down.
Serial Clock Input. High impedance in shutdown or in power down.
Logic High Hardware Enable. HWEN is a high impedance input and is normally connected with
an external pull up resistor to a logic high voltage.
3
Function
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