LTC1697 - High Efficiency Low Power 1W CCFL Switching Regulator

The LTC1697 is designed to control a single 1W cold cathode fluorescent lamp (CCFL). An internal PWM dimming system maximizes efficiency and dimming range. Accurate lamp currents can be set with a single external resistor.

The LTC1697 includes a synchronous current mode PWM controller with internal 1A MOSFET switches. It contains a 300kHz oscillator, 0.8V reference, and internal current sense. It operates from a 2.8V to 5.5V input voltage. The LTC1697 also has a thermal limit and a shutdown that reduces supply current to <2µA.

The LTC1697 is available in the MSOP-10 package.

Features

Operates from Single Li-Ion Battery
2.8V to 5.5V Input Voltage Range
Very Low Shutdown Current: <2µA
Synchronous Buck Architecture for High Efficiency
PWM Dimming Frequency Adjustable with a Single Capacitor
Accurate Lamp Current Maximizes Lamp Lifetime
Fixed Frequency Operation at 300kHz
Internal or External PWM Dimming
Small 10-Pin MSOP Package

Typical Application

Applications

PDAs
Handheld Computers
Portable Instruments
Handheld GPS with Map Display
Handheld TV/Video Monitor

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC1697EMS#PBF	MS-10	E	$2.79	$1.95
LTC1697EMS#TRPBF	MS-10	E		$2.00

Demo Boards

Part Number	Description	Price
DC510A	LTC1697EMS \| 1 Watt CCFL Controller, Vin = 2.7V - 5.5V, VDim = 1V(0%) - 2V(100%)	$150.00