LTC3642
TYPICAL APPLICATION
5V, 50mA Regulator for Automotive Applications
L1
220ꢀH
V
OUT
V
BATT
12V
V
SW
LTC3642
RUN
5V
IN
C
R1
50mA
C
OUT
10ꢀF
IN
1ꢀF
470k
V
FB
R2
88.7k
I
SET
SS
HYST
GND
3642 TA06a
C
C
: TDK C3225X7R2A105M
IN
: KEMET C1210C106K4RAC
OUT
L1: COILTRONICS DRA73-221-R
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
V : 3V to 18V, V
LTC1474
LT®1766
18V, 250mA (I ), High Efficiency Step-Down DC/DC Converter
= 1.2V, I = 10ꢀA, I = 6ꢀA, MSOP8
OUT(MIN) Q SD
OUT
IN
60V, 1.2A (I ), 200kHz, High Efficiency Step-Down DC/DC
V : 5.5V to 60V, V
= 1.2V, I = 2.5mA, I = 25ꢀA,
Q SD
OUT
IN
OUT(MIN)
Converter
TSSOP16/E
LT1934/LT1934-1 36V, 250mA (I ), Micropower Step-Down DC/DC Converter with
V : 3.2V to 34V, V
= 1.25V, I = 12ꢀA, I < 1ꢀA,
Q SD
OUT
IN
OUT(MIN)
™ Package
Burst Mode Operation
ThinSOT
LT1936
36V, 1.4A (I ), 500kHz High Efficiency Step-Down DC/DC
V : 3.6V to 36V, V
= 1.2V, I = 1.9mA, I < 1ꢀA, MS8E
Q SD
OUT
IN
OUT(MIN)
OUT(MIN)
Converter
LT1939
25V, 2A, 2.5MHz High Efficiency DC/DC Converter and LDO
Controller
V : 3.6V to 25V, V
= 0.8V, I = 2.5mA, I < 10ꢀA,
Q SD
IN
3mm × 3mm DFN10
LT1976/LT1977
LT3434/LT3435
LT3437
60V, 1.2A (I ), 200kHz/500kHz, High Efficiency Step-Down DC/DC V : 3.3V to 60V, V
= 1.2V, I = 100ꢀA, I < 1ꢀA,
Q SD
OUT
IN
OUT(MIN)
OUT(MIN)
OUT(MIN)
Converter with Burst Mode Operation
TSSOP16E
60V, 2.4A (I ), 200kHz/500kHz, High Efficiency Step-Down DC/DC V : 3.3V to 60V, V
= 1.2V, I = 100ꢀA, I < 1ꢀA,
Q SD
OUT
IN
Converter with Burst Mode Operation
TSSOP16E
60V, 400mA (I ), Micropower Step-Down DC/DC Converter with
V : 3.3V to 60V, V
= 1.25V, I = 100ꢀA, I < 1ꢀA,
Q SD
OUT
IN
Burst Mode Operation
3mm × 3mm DFN10, TSSOP16E
V : 4V to 40V, V = 1.2V, I = 26ꢀA, I < 1ꢀA,
LT3470
40V, 250mA (I ), High Efficiency Step-Down DC/DC Converter
OUT
IN
OUT(MIN)
Q
SD
with Burst Mode Operation
2mm × 3mm DFN8, ThinSOT
V : 3.6V to 38V, V = 0.78V, I = 70ꢀA, I < 1ꢀA,
LT3480
36V with Transient Protection to 60V, 2A (I ), 2.4MHz, High
OUT
IN
OUT(MIN)
Q
SD
Efficiency Step-Down DC/DC Converter with Burst Mode Operation
3mm × 3mm DFN10, MSOP10E
V : 3.6V to 34V, V = 1.26V, I = 50ꢀA, I < 1ꢀA,
LT3481
34V with Transient Protection to 36V, 2A (I ), 2.8MHz, High
OUT
IN
OUT(MIN)
Q
SD
Efficiency Step-Down DC/DC Converter with Burst Mode Operation
3mm × 3mm DFN10, MSOP10E
V : 3.6V to 36V, V = 0.8V, I = 1.9mA, I < 1ꢀA,
LT3493
36V, 1.4A (I ), 750kHz High Efficiency Step-Down DC/DC
OUT
IN
OUT(MIN)
Q
SD
Converter
2mm × 3mm DFN6
LT3500
36V, 40V
, 2A, 2.5MHz High Efficiency DC/DC Converter and LDO V : 3.6V to 36V, V
= 0.8V, I = 2.5mA, I < 10ꢀA,
MAX
Controller
IN
OUT(MIN) Q SD
3mm × 3mm DFN10
V : 3.6V to 34V, V
LT3505
36V with Transient Protection to 40V, 1.4A (I ), 3MHz, High
Efficiency Step-Down DC/DC Converter
= 0.78V, I = 2mA, I = 2ꢀA,
OUT(MIN) Q SD
OUT
IN
3mm × 3mm DFN8, MSOP8E
V : 3.6V to 25V, V = 0.8V, I = 3.8mA, I = 30ꢀA,
LT3506/LT3506A 25V, Dual 1.6A (I ), 575kHz/1.1MHz High Efficiency Step-Down
OUT
IN
OUT(MIN)
Q
SD
DC/DC Converter
5mm × 4mm DFN16, TSSOP16E
36V with Transient Protection to 40V, Dual 1.4A (I ), 3MHz, High V : 3.7V to 37V, V = 0.8V, I = 4.6mA, I = 1ꢀA,
OUT IN OUT(MIN)
LT3508
LT3684
LT3685
Q
SD
Efficiency Step-Down DC/DC Converter
4mm × 4mm QFN24, TSSOP16E
V : 3.6V to 34V, V = 1.26V, I = 850ꢀA, I < 1ꢀA,
34V with Transient Protection to 36V, 2A (I ), 2.8MHz, High
Efficiency Step-Down DC/DC Converter
OUT
IN
OUT(MIN)
Q
SD
3mm × 3mm DFN10, MSOP10E
V : 3.6V to 38V, V = 0.78V, I = 70ꢀA, I < 1ꢀA,
36V with Transient Protection to 60V, 2A (I ), 2.4MHz, High
Efficiency Step-Down DC/DC Converter
OUT
IN
OUT(MIN)
Q
SD
3mm × 3mm DFN10, MSOP10E
ThinSOT is a trademark of Linear Technology Corporation.
3642f
LT 1108 • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
20
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© LINEAR TECHNOLOGY CORPORATION 2008
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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