FAN5645 Datasheet, PDF (1/10 Pages) Fairchild Semiconductor – Indicator LED Blinker with Single-Wire Interface

September 2007
FAN5645
Indicator LED Blinker with Single-Wire Interface
Features
ƒ Records and plays back blink patterns
ƒ Single-wire digital control of LED blink rate and intensity
ƒ Resistor-programmable LED maximum current
ƒ High-side constant-current driver topology:
- 20mA maximum output
- 40mV typical dropout at 20mA
ƒ 33µA operating current
ƒ Standard 1.8V logic
ƒ Short-circuit protection
ƒ Thermal Shutdown Protection
ƒ Under-Voltage Lockout Protection
ƒ 6-pin 3.0 x 3.0mm MLP package
Applications
ƒ Cell Phones, Smart-Phones
ƒ Pocket PCs, Bluetooth^® Headsets
ƒ PDA, DSC, PMP, and MP3 Players
ƒ Laptop Computers
Description
The FAN5645 is a flexible and compact solution for a
blinking LED indicator. The internal programmable blink
algorithm eliminates any need for continual system
processor control. This means longer battery life for the
hand-held system because the system processor is not
awakened from sleep mode just to blink an LED.
Very low dropout of 40mV allows driving an LED without
any inductors or switch capacitors.
An external resistor sets the LED output current level.
LED blink rate and intensity is controlled by a simple
one-wire interface. In shutdown mode, the supply
current is reduced to 0.3µA (typical).
The FAN5645 is available in 6-pin molded leadless
package (MLP).
Typical Application
2.7 to 5.5V
V_BAT
C_IN
0.1µF
Control
VIN
GND
CTRL
LED+
ISET
GND
Figure 1. Typical Application for the FAN5645
Ordering Information
Part Number
Package
FAN5645MPX MLP-6 3.0 x 3.0mm
Bluetooth® is a registered trademark of Motorola, Inc.
Pb-Free Operating Temperature Range Packing Method
-40°C to 85°C
Tape and Reel
© 2006 Fairchild Semiconductor Corporation
FAN5645 • Rev. 1.0.0
www.fairchildsemi.com