LT1939
24
1939f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2008
LT 0108 • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT1766 60V, 1.2A (I
OUT
), 200kHz High Effi ciency Step-Down DC/DC
Converter
V
IN
: 5.5V to 60V, V
OUT(MIN)
= 1.20V, I
Q
= 2.5mA, I
SD
= 25µA,
16-Lead TSSOPE Package
LT1933 36V, 500mA (I
OUT
), 500kHz Step-Down Switching Regulator in
SOT-23
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 1.2V, I
Q
= 1.6mA, I
SD
< 1µA,
ThinSOT
TM
Package
LT1936 36V, 1.4A (I
OUT
), 500kHz High Effi ciency Step-Down DC/DC
Converter
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 1.2V, I
Q
= 1.9mA, I
SD
< 1µA,
8-Lead MS8E Package
LT1940 Dual 25V, 1.4A (I
OUT
), 1.1MHz High Effi ciency Step-Down DC/DC
Converter
V
IN
: 3.6V to 25V, V
OUT(MIN)
= 1.20V, I
Q
= 3.8mA, I
SD
< 30µA,
16-Lead TSSOPE Package
LTC3407/LTC3407-2 Dual 600mA/800mA, 1.5MHz/2.25MHz Synchronous Step-Down
DC/DC Converter
V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 40µA, I
SD
< 1µA,
3mm × 3mm DFN and 10-Lead MS10E Packages
LT3434/LT3435 60V, 2.4A (I
OUT
), 200kHz/500kHz High Effi ciency Step-Down DC/DC
Converters with Burst Mode Operation
V
IN
: 3.3V to 60V, V
OUT(MIN)
= 1.20V, I
Q
= 100µA, I
SD
< 1µA,
16-Lead TSSOPE Package
LT3437 60V, 400mA (I
OUT
), Micropower Step-Down DC/DC Converter with
Burst Mode Operation
V
IN
: 3.3V to 60V, V
OUT(MIN)
= 1.25V, I
Q
= 100µA, I
SD
< 1µA,
10-Lead 3mm × 3mm DFN, 16-Lead TSSOPE Package
LT3493 36V, 1.4A (I
OUT
), 750kHz High Effi ciency Step-Down DC/DC
Converter
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 1.9mA, I
SD
< 1µA,
6-Lead 2mm × 3mm DFN Package
LT3501 Dual 25V, 3A (I
OUT
), 1.5MHz High Effi ciency Step-Down DC/DC
Converter
V
IN
: 3.3V to 25V, V
OUT(MIN)
= 0.8V, I
Q
= 3.7mA, I
SD
< 10µA,
20-Lead TSSOPE Package
LT3502/LT3502A 40V, 500mA (I
OUT
), 1.1MHz/2.2MHz High Effi ciency Step-Down
DC/DC Converter
V
IN
: 3V to 40V, V
OUT(MIN)
= 0.8V, I
Q
= 1.5mA, I
SD
< 2µA,
8-Lead 2mm × 2mm DFN Package
LT3503 20V, 1A (I
OUT
), 2.2MHz High Effi ciency Step-Down DC/DC Converter V
IN
: 3.6V to 20V, V
OUT(MIN)
= 0.78V, I
Q
= 1.9mA, I
SD
< 1µA,
6-Lead 2mm × 3mm DFN Package
LT3505 36V, 1.2A (I
OUT
), 3MHz High Effi ciency Step-Down DC/DC Converter V
IN
: 3.6V to 36V, V
OUT(MIN)
= 0.78V, I
Q
= 2mA, I
SD
< 2µA,
8-Lead 3mm × 3mm DFN and MSE Packages
LT3506/LT3506A Dual 25V, 1.6A (I
OUT
), 575kHz/1.1MHz High Effi ciency Step-Down
DC/DC Converters
V
IN
: 3.6V to 25V, V
OUT(MIN)
= 0.8V, I
Q
= 3.8mA, I
SD
< 30µA,
16-Lead 4mm × 5mm DFN and TSSOPE Packages
LT3508 Dual 36V, 1.4A (I
OUT
), 2.5MHz High Effi ciency Step-Down DC/DC
Converter
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 4.3mA, I
SD
< 1µA,
24-Lead 4mm × 4mm QFN and 16-Lead TSSOPE Packages
LT3510 Dual 25V, 2A (I
OUT
), 1.5MHz High Effi ciency Step-Down DC/DC
Converter
V
IN
: 3.3V to 25V, V
OUT(MIN)
= 0.8V, I
Q
= 3.7mA, I
SD
< 10µA,
20-Lead TSSOPE Package
LTC3548 Dual 400mA/800mA, 2.25MHz Synchronous Step-Down DC/DC
Converter
V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 40µA, I
SD
< 1µA,
3mm × 3mm DFN and 10-Lead MSE Packages
LT3680 36V, 3.5A (I
OUT
), 2.4MHz High Effi ciency Step-Down DC/DC
Converter
V
IN
: 3.6V to 36V, V
OUT(MIN)
= 0.79V, I
Q
= 75µA, I
SD
< 1µA,
3mm × 3mm DFN and MS10E Packages
LT3500 40V, 2A (I
OUT
), 2.2MHz High Effi ciency Step-Down DC/DC Converter V
IN
: 28V to 36V, V
OUT(MIN)
= 0.8V, I
Q
= 75µA, I
SD
< 12µA,
3mm × 3mm DFN
1.8V/2A Step-Down Regulator
L1
2.2µH
D1
D2
C1
2.2µF
C2
0.47µF
C5
0.47µF
C7
22µF
C3
220pF
R5
40.2k
R2
8.06k
R6
49.9k
R1
10k
R3
24.9k
R4
8.06k
4.5V TO 25V
C6
1µF
1939 TA05
V
OUT1
1.8V
2A
V
OUT2
3.3V
10mA
LDRVV
IN
LFB
BST
SHDN
SS
LT1939
R
T
/SYNC
V
C
SW
FB
PG
PG
