LT1931/LT1931A
U
TYPICAL APPLICATIO
2.2MHz, 12V to –5V Converter Uses Low Profile Coupled Inductor
C2
0.1µF
L1A
4.7µH
L1B
4.7µH
V
IN
12V
D1
V
V
SW
OUT
IN
–5V
SHDN
450mA
R1
28.7k
LT1931A
C1
2.2µF
C3
4.7µF
NFB
GND
R2
10k
C1: TAIYO YUDEN Y5V EMK212F225ZG
C2: 0.1µF 25V X5R
1931 TA07a
C3: TAIYO YUDEN X5R JMK212BJ475MG
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CLQ4D10-4R7 DRAWING #5382-T039
Efficiency
80
75
70
65
60
55
50
0
100
200
300
400
500
LOAD CURRENT (mA)
1931 TA07b
RELATED PARTS
PART NUMBER
LT1307
DESCRIPTION
COMMENTS
Single Cell Micropower 600kHz PWM DC/DC Converter
3.3V at 75mA from One Cell, MSOP Package
1.5V Minimum, Precise Control of Peak Current Limit
3.3V at 200mA from Two Cells, 600kHz Fixed Frequency
3V at 30mA from 1V, 1.7MHz Fixed Frequency
–5V at 150mA from 5V Input. Tiny SOT-23 Package
5V at 200mA from 3.3V Input. Tiny SOT-23 Package
20V at 12mA from 2.5V. Tiny SOT-23 Package
–15V at 12mA from 2.5V. Tiny SOT-23 Package
5V at 450mA from 3.3V Input. Tiny SOT-23 Package
LT1316
Burst ModeTM Operation DC/DC with Programmable Current Limit
2-Cell Micropower DC/DC with Low-Battery Detector
Single Cell Micropower DC/DC Converter
LT1317
LT1610
LT1611
Inverting 1.4MHz Switching Regulator in 5-Lead ThinSOT
1.4MHz Switching Regulator in 5-Lead ThinSOT
LT1613
LT1615
Micropower Constant Off-Time DC/DC Converter in 5-Lead ThinSOT
Micropower Inverting DC/DC Converter in 5-Lead ThinSOT
1.2MHz/2.2MHz, 1A Switching Regulators in 5-Lead ThinSOT
LT1617
LT1930/LT1930A
Burst Mode operation is a trademark of Linear Technology Corporation.
1931fa
LT/LT 1005 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
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(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
© LINEAR TECHNOLOGY CORPORATION 2000
Linear [ Linear ]
