LT3508
TYPICAL APPLICATION
5V, 1.8V Output from PCI Express
V
V
IN
IN2
12V
R9
3.3V
C1
4.7ꢀF
C2
4.7ꢀF
40.2k
V
V
IN2
IN1
D2
SHDN
D1
R10
14.7k
BOOST1
BOOST2
SW2
L2
3.3ꢀH
C3
C4
0.1ꢀF
L1 6.8ꢀH
OUT1
0.1ꢀF
OUT2
1.8V
1.4A
5V
SW1
0.9A
D3
D4
LT3508
R1
52.3k
R2
18.7k
FB1
FB2
V
V
C2
C1
R3
R5
R4
15.0k
R6
47k
C5
47ꢀF
TRACK/SS1
TRACK/SS2
PG1
PG2
10k
43k
C8
0.047ꢀF
R7
100k
C9
100pF
C6
10ꢀF
GND R /SYNC
T
C7
330pF
R8
33.2k
C10
0.047ꢀF
POWER
GOOD
f
= 1MHz
C1 TO C6: X5R OR X7R
D1, D2: MMSD4148
SW
3508 TA05
D3: DIODES INC. B140
D4: DIODES INC. B120
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1765
25V, 2.75A (I ), 1.25MHz, High Efficiency Step-Down V : 3V to 25V, V
= 1.2V, I = 1mA, S8, TSSOP16E Packages
OUT(MIN) Q
OUT
IN
DC/DC Converter
LT1766
LT1767
60V, 1.2A (I ), 200kHz, High Efficiency Step-Down
V : 5.5V to 60V, V
= 1.2V, I = 2.5mA, TSSOP16/TSSOP16E
OUT
IN
OUT(MIN) Q
DC/DC Converter
Packages
25V, 1.2A (I ), 1.25MHz, High Efficiency Step-Down
V : 3V to 25V, V
= 1.2V, I = 1mA, MS8, MS8E Packages
OUT
IN
OUT(MIN) Q
DC/DC Converter
LT1940/LT1940L Dual Monolithic 1.4A, 1.1MHz Step-Down Switching
Regulators
V : 3.6V to 25V, V
= 1.25V, I = 3.8mA, TSSOP16E Packages
OUT(MIN) Q
IN
LTC3407
Dual 600mA, 1.5MHz, Synchronous Step-Down
Regulator
V : 2.5V to 5.5V, V
= 0.6V, I = 40ꢀA, MSE Package
OUT(MIN) Q
IN
LT3493
1.2A, 750kHz Step-Down Switching Regulator in
2mm × 3mm DFN
V : 3.6V to 36V, V
= 0.78V, I = 1.9mA, 2mm × 3mm DFN Package
Q
IN
OUT(MIN)
LT3501/LT3510
Dual 3A/2A, 1.5MHz High Efficiency Step-Down
Switching Regulators
V : 3.6V to 25V, V
= 0.8V, I = 3.7mA, I < 10ꢀA,
Q SD
IN
OUT(MIN)
TSSOP20E Package
LT3506/LT3506A Dual Monolithic 1.6A, 1.1MHz Step-Down Switching
Regulators
V : 3.6V to 25V, V
= 0.8V, I = 3.8mA, 16-Lead DFN and 16-Lead
Q
IN
OUT(MIN)
TSSOPE Packages
LTC3701
LTC3736
LTC3737
Two Phase, Dual, 500kHz, Constant Frequency, Current V : 2.5V to 10V, V
= 0.8V, I = 460ꢀA, SSOP-16 Package
IN
OUT(MIN)
Q
Mode, High Efficiency Step-Down DC/DC Controller
Dual Two Phase, No R
with Output Tracking
™, Synchronous Controller
DC/DC Controller with
V : 2.75V to 9.8V, V
= 0.6V, I = 300ꢀA, 4mm × 4mm QFN or
SENSE
IN
OUT(MIN)
Q
SSOP-24 Packages
Dual Two Phase, No R
Output Tracking
V : 2.75V to 9.8V, V
= 0.6V, I = 220ꢀA, 4mm × 4mm QFN or
SENSE
IN
OUT(MIN)
Q
SSOP-24 Packages
No R
is a trademark of Linear Technology Corporation.
SENSE
3508fb
LT 0208 REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
24
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© LINEAR TECHNOLOGY CORPORATION 2007
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
Linear [ Linear ]
