LT1946A Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LT1946A Datasheet PDF : 12 Pages
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LT1946A
TYPICAL APPLICATIO S
Low Profile (< 1.1mm Tall) Triple Output TFT Supply (8V, – 8V, 24V)
D2
D3
D4
D5
VON
23V
5mA
C5
0.1µF
C6
0.1µF
C7
0.1µF
L1
VIN
1.2µH
D1
3.3V
6
5
3 VIN
SW
OFF ON SHDN
+
C1
8
SS LT1946A
7
COMP
2
FB
4.7µF
VC
GND*
CSS
100nF
1
4
C1–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–D7: ZETEX BAT54S OR EQUIVALENT
L1: COILCRAFT LP01704-122MC
* EXPOSED PAD MUST ALSO BE GROUNDED
C8
0.1µF
Transient Response
R2
28.7k
R3
5.23k
D7
D6
AVDD
8V
375mA
C2
C4
20µF
1µF
C3
2.2µF
VOFF
–8V
10mA
1946A TA05
Efficiency
90
85
80
75
70
65
60
55
VON LOAD = 5mA
VOFF LOAD = 10mA
50
0
100
200
300
400
AVDD LOAD CURRENT (mA)
1946A TA06
Start-Up Waveforms
AVDD
50mV/DIV
AC COUPLED
ILI
0.5A/DIV
ILOAD
350mA
200mA
50µs/DIV
1946A TA07
AVDD
5V/DIV
VON
10V/DIV
VOFF
5V/DIV
IIN
0.5A/DIV
1ms/DIV
1946A TA08
RELATED PARTS
PART NUMBER
DESCRIPTION
LT1613
LT1615/LT1615-1
550mA (ISW), 1.4MHz, Step-Up DC/DC Converter
300mA/0.75mA (ISW), Constant Off-Time Step-Up
DC/DC Converter
LT1930/LT1930A
1A (ISW), 1.2MHz/2.2MHz, Step-Up DC/DC Converter
LT1946
1.5A (ISW), 1.2MHz, Step-Up DC/DC Converter
LT1961
1.5A (ISW), 1.25MHz, Step-Up DC/DC Converter
ThinSOT is a trademark of Linear Technology Corporation.
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507 q www.linear.com
COMMENTS
VIN = 0.9V to 10V, VOUT to 34V, IQ = 3mA, ISD < 1µA, ThinSOTTM
VIN = 1V to 15V, VOUT to 34V, IQ = 20µA, ISD < 1µA, ThinSOT
VIN = 2.6V to 16V, VOUT to 34V, IQ = 4.2mA/5.5mA, ISD < 1µA, ThinSOT
VIN = 2.45V to 16V, VOUT to 34V, IQ = 3.2mA, ISD < 1µA, MS8
VIN = 3V to 25V, VOUT to 35V, IQ = 0.9mA, ISD < 6µA, MS8E
sn1946a 1946afs
LT/TP 1102 2K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001
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