Fairchild Semiconductor FAN5645MPX, FAN5645 Datasheet

September 2007

FAN5645 Indicator LED Blinker with Single-Wire Interface

FAN5645 — Indicator LED Blinker with Single-Wire Interface

Features

 Records and plays back blink patterns  Single-wire digital control of LED blink rate and intensity  Resistor-programmable LED maximum current  High-side constant-current driver topology:

- 20mA maximum output

- 40mV typical dropout at 20mA

 33µA operating current  Standard 1.8V logic  Short-circuit protection  Thermal Shutdown Protection  Under-Voltage Lockout Protection  6-pin 3.0 x 3.0mm MLP package

Applications

 Cell Phones, Smart-Phones  Pocket PCs, Bluetooth

Headsets

 PDA, DSC, PMP, and MP3 Players  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

2.7to5.5V

BAT

0.1µF

Control

VIN

GND

CTRL

LED+

ISET

GND

SET

Figure 1. Typical Application for the FAN5645

Ordering Information

Part Number Package Pb-Free Operating Temperature Range Packing Method

FAN5645MPX MLP-6 3.0 x 3.0mm

Bluetooth® is a registered trademark of Motorola, Inc.

-40°C to 85°C Tape and Reel

Block Diagram

FAN5645 — Indicator LED Blinker with Single-Wire Interface

CTRL

VIN

GND

Under-Voltage

Lockout

Input edge

detector

&timer

Bandgap

reference

UVLO TSD

Ref. current

Thermal Shutdown

Oscillator

DATA

generator

Protection

Control logic

&memory

Output current mirror

ISET

SET

Figure 2. Block Diagram

LED ON

LED+

Pin Configuration

1 6

LED+

ISET

2 5

3 4

(GND)

Top View

Figure 3. MLP Pin Assignments

VINGND

GND

CTRL

Pin Definitions

Pin # Name Description

1 GND

2 LED+

3 ISET

4 CTRL Digital single wire interface. Program STOP/TRAIN/RUN sequences.

5 GND

6 VIN

Ground. 0V reference for all voltages. LED output. Connect to anode of LED. Current Set. Resistor to GND sets maximum LED current 1:400.

Ground. 0V reference for all voltages. Power input.

FAN5645 — Indicator LED Blinker with Single-Wire Interface

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.

Symbol Parameter Min. Max. Unit

VIN, LED+, CTRL Voltage -0.3 +6.0 V

ISET Voltage -0.3 VIN+0.2 V

TJ Junction Temperature -40 150 °C

Storage Temperature -65 150 °C

STG

TL Lead Soldering Temperature, 10 seconds 260 °C

HBM 7

ESD Electrostatic Discharge Protection Level

CDM 2

HBM (on LED+ pin) 8

Recommended Operating Conditions

The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings.

Symbol Parameter Min. Max. Units

VIN Power Supply Voltage Range 2.7 5.5 V

Output Current 1 20 mA

OUT

Resistor Used to Set LED Current 24.7 494.0 kΩ

SET

TA Operating Ambient Temperature Range -40 +85 °C

TJ Operating Junction Temperature Range -40 +125 °C

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