LT1946 Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LT1946 Datasheet PDF : 12 Pages
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LT1946
TYPICAL APPLICATIO
Low Profile, Triple Output TFT Supply (8V, – 8V, 23V)
D2
D3
D4
D5
VON
23V
5mA
C5
0.1µF
C6
0.1µF
C7
0.1µF
VIN
3.3V
+
L1
5.4µH
6
5
3 VIN
SW
OFF ON SHDN
C1
4.7µF
8
SS LT1946
7
COMP
2
FB
VC
GND
CSS
100nF
1
4
RC
49.9k
CC
470pF
C1 TO C8: X5R OR X7R
C1: 4.7µF, 6.3V
C2: 2 × 10µF, 10V
C3: 2.2µF, 10V
C4: 1µF, 25V
C5, C6, C8: 0.1µF, 10V
C7: 0.1µF, 16V
D1: MICROSEMI UPS120 OR EQUIVALENT
D2 TO D5: ZETEX BAT54S OR EQUIVALENT
L1: SUMIDA CDRH5D18-5R4
D1
R2
28.7k
R3
5.23k
C8
0.1µF
D7
D6
AVDD
8V
375mA
C2
C4
20µF
1µF
C3
2.2µF
VOFF
–8V
1946 TA03 10mA
Efficiency
85
80
75
70
65
60
55 VON LOAD = 5mA
VOFF LOAD = 10mA
50
0
100
200
300
400
AVDD LOAD CURRENT (mA)
1946 TA03a
AVDD
2V/DIV
VON
10V/DIV
VOFF
5V/DIV
IIN
200mA/V
Start-Up Waveforms
1ms/DIV
1946 TA04
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PART NUMBER DESCRIPTION
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1.4MHz Switching Regulator in 5-Lead ThinSOTTM
LT1615
Micropower Constant Off-Time DC/DC Converter in 5-Lead ThinSOT
LT1930/LT1930A 1.2MHz/2.2MHz, 1A Switching Regulator in 5-Lead ThinSOT
LT1944/LT1944-1 Dual 350mA Boost Converter
LT1945
Dual ±250mA Boost Converter
LT1946A
2.7MHz, 1.5A Boost DC/DC Converter
LT1947
3MHz, Dual Switching Regulator
ThinSOT is a trademark of Linear Technology Corporation.
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
COMMENTS
5V at 200mA from 3.3V Input, ThinSOT Package
20V at 12mA from 2.5V, ThinSOT Package
12V at 300mA from 5V Input, ThinSOT Package
VIN = 1.2V to 15V, VOUT to 34V, MS10 Package
VIN = 1.2V to 15V, VOUT to ±34V, MS10 Package
VIN = 2.45V to 16V, VOUT to 34V, MS8E Package
8V at 200mA from 3.3V Input, 10-Lead MSOP Package
1946fb
LT 0207 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001
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