LT1946 LINER [Linear Technology], LT1946 Datasheet - Page 12

• Manufacturer Part Number: LT1946
• Description: 1.2MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
• Manufacturer: LINER [Linear Technology]

TYPICAL APPLICATIO
LT1946
RELATED PARTS
PART NUMBER
LT1613
LT1615
LT1930/LT1930A
LT1944/LT1944-1
LT1945
LT1946A
LT1947
Burst Mode and ThinSOT are trademarks of Linear Technology Corporation.
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone]
85
80
70
60
55
50
75
65
0
V
V
DESCRIPTION
1.4MHz Switching Regulator in 5-Lead ThinSOT
Micropower Constant Off-Time DC/DC Converter in 5-Lead ThinSOT
1.2MHz/2.2MHz, 1A Switching Regulator in 5-Lead ThinSOT
Dual 350mA Boost Converter
Dual 250mA Boost Converter
12.7MHz, 1.5A Boost DC/DC Converter
3MHz, Dual Switching Regulator
ON
OFF
LOAD = 5mA
LOAD = 10mA
100
AV
DD
LOAD CURRENT (mA)
Efficiency
3.3V
V
200
IN
+
C1 TO C8: X5R OR X7R
C1: 4.7 F, 6.3V
C2: 2 10 F, 10V
C3: 2.2 F, 10V
C4: 1 F, 25V
C5, C6, C8: 0.1 F, 10V
C7: 0.1 F, 16V
D1: MICROSEMI UPS120 OR EQUIVALENT
D2 TO D5: ZETEX BAT54S OR EQUIVALENT
L1: SUMIDA CDRH5D18-5R4
100nF
C1
4.7 F
U
C
300
SS
Low Profile, Triple Output TFT Supply (8V, – 8V, 23V)
OFF ON
1946 TA03a
www.linear.com
400
3
8
7
SHDN
SS
COMP
V
V
IN
C
6
1
R
49.9k
C
LT1946
C
470pF
5.4 H
C
L1
TM
GND
SW
FB
5
4
2
D2
0.1 F
D3
C5
0.1 F
C8
D1
200mA/V
10V/DIV
2V/DIV
5V/DIV
AV
R2
28.7k
V
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
V
V
V
8V at 200mA from 3.3V Input, 10-Lead MSOP Package
R3
5.23k
V
D7
D6
OFF
DD
ON
I
C6
0.1 F
IN
IN
IN
IN
= 1.2V to 15V, V
= 1.2V to 15V, V
= 2.45V to 16V, V
D4
D5
C7
0.1 F
C2
20 F
C3
2.2 F
Start-Up Waveforms
1946 TA03
OUT
OUT
C4
1 F
OUT
V
–8V
10mA
V
23V
5mA
AV
8V
375mA
ON
OFF
to 34V, MS10 Package
to 34V, MS10 Package
1ms/DIV
DD
to 34V, MS8E Package
LINEAR TECHNOLOGY CORPORATION 2001
LT/TP 1002 2K • PRINTED IN USA
1946 TA04
sn1946 1946fs