
8
LTC1427-50
142750f LT/TP 0398 4K PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1998
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417q (408)432-1900
FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
TYPICAL APPLICATIONS
U
SMBus-Controlled Floating CCFL Power Supply
PART NUMBER
DESCRIPTION
COMMENTS
LTC1329-10/LTC1329-50
Micropower 8-Bit Current Source DAC
1-Wire, 2-Wire or Standard 3-Wire SPI Control
LTC1380/LTC1393
SMBus Single-Ended 8-Channel/Differential
Single 2.7V to
±5V Supply, Low Power
4-Channel Multiplexers
LTC1426
Micropower Dual 6-Bit PWM DAC
Pulse Mode and Push-Button Mode Interface
LTC1428
Micropower 8-Bit Current Sink DAC
1-Wire, 2-Wire or Standard 3-Wire SPI Control
LTC1623
SMBus Dual High Side Switch Controller
Regulated Onboard Charge Pump Drives External N-Channel MOSFETs
RELATED PARTS
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
16
15
14
13
12
11
10
9
BAT
8V TO 28V
1
2
3
4
5
6
7
8
1
2
3
4
8
7
6
5
ICCFL
DIO
CCFL VC
AGND
SHDN
NC
CCFL VSW
BULB
BAT
ROYER
VIN
REF
NC
CCFL
PGND
NC
LT1184F
LAMP
UP TO 6mA
10
6
L1
R1
750
L2
100
H
3
21
5
4
+
C7, 1
F
SHDN
C6
0.1
F
TO
SMBUS
HOST
C1*
0.1
F
D1
1N5818
C5
1000pF
R2
220k
R3
100k
C3A
2.2
F
35V
C4
2.2
F
1427 TA01
VIN
3.3V
C3B
2.2
F
35V
C2
27pF
3kV
+
Q2*
Q1*
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3B WITH AN
ESR
≥ 0.5 TO PREVENT DAMAGE TO THE LT1184F HIGH-SIDE
SENSE RESISTOR DUE TO SURGE CURRENTS AT TURN-ON.
C1 MUST BE A LOW LOSS CAPACITOR, C1 = WIMA MKP-20
Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001
L1 = COILTRONICS CTX210605
L2 = COILTRONICS CTX100-4
*DO NOT SUBSTITUTE COMPONENTS
COILTRONICS (407) 241-7876
0
A TO 50A ICCFL CURRENT GIVES
0mA TO 6mA LAMP CURRENT FOR A
TYPICAL DISPLAY.
D5
BAT85
VCC
3.3V
LTC1427-50
NC
SHDN
AD1
AD0
GND
VCC
IOUT
SCL
SDA
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
U
0.016 – 0.050
0.406 – 1.270
0.010 – 0.020
(0.254 – 0.508)
× 45°
0
°– 8° TYP
0.008 – 0.010
(0.203 – 0.254)
SO8 0996
0.053 – 0.069
(1.346 – 1.752)
0.014 – 0.019
(0.355 – 0.483)
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
1
2
3
4
0.150 – 0.157**
(3.810 – 3.988)
8
7
6
5
0.189 – 0.197*
(4.801 – 5.004)
0.228 – 0.244
(5.791 – 6.197)
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**