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LTC1697 Datasheet

High Efficiency Low Power 1W CCFL Switching Regulator

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LTC1697 pdf
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


Linear Technology Electronic Components Datasheet

LTC1697 Datasheet

High Efficiency Low Power 1W CCFL Switching Regulator

No Preview Available !

LTC1697 pdf
LTC1697
ABSOLUTE AXI U RATI GS
(Notes 1, 2)
VIN Voltage .................................................. –0.5V to 6V
VC, OVSEN, CDIM, RPROG, SW
Voltages ................................... –0.5V to (VIN + 0.3V)
SHDN, VDIM Pins ......................................... –0.5V to 6V
LAMP Pin ................................................. –0.5V to 0.5V
Operating Temperature Range (Note 5) ...–40°C to 85°C
Storage Temperature Range ..................–65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
CDIM 1
VDIM 2
0VSEN 3
SW 4
GND 5
TOP VIEW
10 SHDN
9 RPROG
8 VC
7 VIN
6 LAMP
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C,
θJA = 160°C/W 1 LAYER BOARD
ORDER PART
NUMBER
LTC1697EMS
MS PART MARKING
LTZR
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. 2.8V < VIN 5.5V unless otherwise specified.
SYMBOL
VIN
VUVLO
IQ-SHDN
IQ-Active
ILEAK
RON
IMAX
% DC
fSWITCH
fDIM
VDIM
IDIM
RLAMP
IL(ERROR)
RP(RANGE)
VSHDN-H
VSHDN-L
ISHDN
IOVSEN
VOVSEN
VDIM(SD-I)
VDIM(SD-H)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Operating Supply Voltage Range
(Note 2)
2.8
5.5 V
Undervoltage Lockout
2.77 V
Quiescent Current - SHDN
Quiescent Current - Active
Switch Leakage
SHDN = 0V; VDIM = 0V
VC = 0V, SHDN = VIN = VDIM = 4.2V (Note 4)
12
0.9 1.5
0.1 1
µA
mA
µA
Switch On Resistance
Switch Current Limit
VIN = 4V
0.9
0.18
1.6
A
Duty Cycle
0
95 %
Switching Frequency
240 300 370
kHz
Dimming PWM Frequency
VDIM Input Voltage
CDIM = 0.022µF (Note 3)
Dimming PWM Duty Cycle = 0%
Dimming PWM Duty Cycle = 100%
190 250 310
1.0
2.0
Hz
V
V
VDIM Input Bias Current
Internal RLAMP Resistance
Lamp Current Accuracy
Programming Resistor Range
VDIM = 2V
LAMP Pin to GND
±1
50 60
|1– ILAMP(AVG)/(32/6.4k)| • 100% (Note 6)
ILAMP = 5mA
26
(Note 10)
6.4
16
µA
%
k
SHDN Input High
1.2 V
SHDN Input Low (Note 9)
0.4 V
SHDN Input Current
Overvoltage Sense Protect Current (Note 7)
Overvoltage Sense Pin Voltage
VSHDN = VIN
ILAMP = 5mA, RPROG = 6.4k
0.1 1
16.65 21.5 26.35
0.95
1.2
1.5
µA
µA
V
Passive Shutdown Voltage (Note 8)
0.4 V
Not in Passive Shutdown
1.05
V
1697f


Part Number LTC1697
Description High Efficiency Low Power 1W CCFL Switching Regulator
Maker Linear
Total Page 8 Pages
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