lt1931a Linear Technology Corporation, lt1931a Datasheet - Page 12

• Manufacturer Part Number: lt1931a
• Description: Lt1931a - 1.2mhz/2.2mhz Inverting Dc/dc Converters In Thinsot
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIO
LT1931/LT1931A
RELATED PARTS
PART NUMBER
LT1307
LT1316
LT1317
LT1610
LT1611
LT1613
LT1615
LT1617
LT1930/LT1930A
Burst Mode operation is a trademark of Linear Technology Corporation.
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
DESCRIPTION
Single Cell Micropower 600kHz PWM DC/DC Converter
Burst Mode
2-Cell Micropower DC/DC with Low-Battery Detector
Single Cell Micropower DC/DC Converter
Inverting 1.4MHz Switching Regulator in 5-Lead ThinSOT
1.4MHz Switching Regulator in 5-Lead ThinSOT
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
●
FAX: [phone]
TM
Operation DC/DC with Programmable Current Limit
2.2MHz, 12V to – 5V Converter Uses Low Profile Coupled Inductor
12V
V
IN
U
●
www.linear-tech.com
C1: TAIYO YUDEN Y5V EMK212F225ZG
C2: 0.1µF 25V X5R
C3: TAIYO YUDEN X5R JMK212BJ475MG
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CLQ4D10-4R7 DRAWING #5382-T039
C1
2.2µF
80
75
70
65
60
55
50
0
V
SHDN
IN
LT1931A
100
4.7µH
L1A
GND
LOAD CURRENT (mA)
NFB
SW
Efficiency
200
300
0.1µF
R1
28.7k
R2
10k
C2
400
1931 TA07b
D1
4.7µH
500
COMMENTS
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
L1B
1931 TA07a
C3
4.7µF
V
–5V
450mA
OUT
© LINEAR TECHNOLOGY CORPORATION 2000
LT/LT 1005 REV A • PRINTED IN USA
1931fa