鈻?/div>
DESCRIPTIO
Operates from Single Li-Ion Battery
2.8V to 5.5V Input Voltage Range
Very Low Shutdown Current: <2碌A
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
The LTC
廬
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 <2碌A.
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.
APPLICATIO S
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
PDAs
Handheld Computers
Portable Instruments
Handheld GPS with Map Display
Handheld TV/Video Monitor
TYPICAL APPLICATIO
6
1
10
2
3
5
4
27pF
1kV
V
IN
2.8V TO 5.5V
330鈩?/div>
0.15碌F
CCFL
LAMP
10
9
8
7
6
I
CCFL
(mA)
33碌H
200k
5
4
3
Li-Ion
CELL
+
OFF ON
DIMMING INPUT
1V(0%) 鈥?2V(100%)
V
IN
SW 0V
SEN
SHDN
LTC1697
V
DIM
LAMP
C
DIM
R
PROG
GND
8.25k
V
C
0.1碌F
2
4k
10碌F
0.022碌F
1697 TA01
U
I
CCFL
vs R
PROG
6k
8k 10k
R
PROG
(鈩?
20k
1967 TA01b
U
U
1697f
1
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