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LTC1697 fiches techniques PDF

Linear - High Efficiency Low Power 1W CCFL Switching Regulator

Numéro de référence LTC1697
Description High Efficiency Low Power 1W CCFL Switching Regulator
Fabricant Linear 
Logo Linear 





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LTC1697 fiche technique
LTC1697
High Efficiency Low Power
1W CCFL Switching Regulator
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
U
APPLICATIO S
PDAs
Handheld Computers
Portable Instruments
Handheld GPS with Map Display
Handheld TV/Video Monitor
DESCRIPTIO
The LTC®1697 is designed to control a single 1W cold
cathode fluorescent lamp (CCFL). An internal PWM dim-
ming 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Protected by U.S. Patent 6522116.
TYPICAL APPLICATIO
65
1 10 2 3 4
27pF
1kV
VIN
2.8V TO 5.5V
330
0.15µF
CCFL
LAMP
+
Li-Ion
CELL
33µH
200k
10µF
OFF ON
DIMMING INPUT
1V(0%) – 2V(100%)
0.022µF
VIN SW 0VSEN
SHDN
LTC1697
VDIM LAMP
CDIM
RPROG
VC
GND
8.25k
0.1µF
1697 TA01
ICCFL vs RPROG
10
9
8
7
6
5
4
3
2
4k 6k 8k 10k
RPROG ()
20k
1967 TA01b
1697f
1

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