20
LTC3701
3701fa
PART NUMBER DESCRIPTION COMMENTS
LTC1622 Synchronizable Low Input Voltage Current Mode V
IN
2V to 10V, Burst Mode Operation, 8-Lead MSOP
Step-Down DC/DC Controller
LTC1628/ Dual High Efficiency, 2-Phase Synchronous Constant Frequency, Standby, 5V and 3.3V LDOs, V
IN
to 36V,
LTC1628-PG Step Down Controllers 28-Lead SSOP
LTC1629/ 20A TO 200A PolyPhase
TM
High Efficiency Controllers Expandable Up to 12 Phases, No Heat Sinks, V
IN
to 36V,
LTC1629-PG 28-Lead SSOP
LTC1702A No R
SENSE
TM
2-Phase Dual Synchronous Controller 550kHz, No Sense Resistor, GN24, V
IN
to 7V
LTC1708-PG Dual High Efficiency, 2-Phase Synchronous 1.3V≤ V
OUT
≤ 3.5V, Current Mode, 3.5V ≤ V
IN
≤ 36V
Step-Down Switching Regulators
LTC1735 High Efficiency Synchronous Step-Down Controller Burst Mode Operation, 16-Pin Narrow SSOP, Fault Protection,
3.5V ≤ V
IN
≤ 36V
LTC1767 1.2A I
OUT
, 1.25MHz, High Efficiency Step-Down DC/DC Converter 90% Efficiency, V
IN
: 3V to 25V, V
OUT
= 1.2V, I
Q
= 1mA,
I
SD
= 6µA, MS8E Package
LTC1772 Constant Frequency Current Mode Step-Down 2.5V ≤ V
IN
≤ 9.8V, I
OUT
Up to 4A, SOT-23 Package, 550kHz
DC/DC Controller
LTC1773 Synchronous Step-Down Controller 2.65V ≤ V
IN
≤ 8.5V, I
OUT
Up to 4A, 10-Lead MSOP
LTC1778 No R
SENSE
Synchronous Step-Down Controller Current Mode Operation Without Sense Resistor,
Fast Transient Response, 4V ≤ V
IN
≤ 36V
LTC1872 Constant Frequency Current Mode Step-Up Controller 2.5V ≤ V
IN
≤ 9.8V, SOT-23 Package, 550kHz
LTC1929 Constant Frequency Current Mode 2-Phase Up to 42A, No Heat Sink, 3.5V ≤ V
IN
≤ 36V
Synchronous Controller
LTC3411 1.25A (I
OUT
), 4MHz, Synchronous Step-Down DC/DC Converter 95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT
= 0.8V, I
Q
= 60µA,
I
SD
= <1µA, MS Package
LTC3412 2.5A (I
OUT
), 4MHz, Synchronous Step-Down DC/DC Converter 95% Efficiency, V
IN
: 2.5V to 5.5V, V
OUT
= 0.8V, I
Q
= 60µA,
I
SD
= <1µA, TSSOP-16E Package
LTC3700 Constant Frequency Step-Down Controller with LDO Regulator 2.65≤ V
IN
␣ ≤␣ 9.8V, 550kHz, 10-Lead SSOP
LTC3728/LTC3728L Dual, 550kHz, 2-Phase Synchronous Step-Down Constant Frequency, V
IN
to 36V, 5V and 3.3V LDOs,
Switching Regulator 5mm × 5mm QFN or 28-Lead SSOP
PolyPhase and No R
SENSE
are trademarks of Linear Technology Corporation.
LINEAR TECHNOLOGY CORPORATION 2002
LT/TP 0403 1K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
TYPICAL APPLICATIO
U
RELATED PARTS
Dual Input Voltage Single Output, 2-Phase, 550kHz, Step-Down DC/DC Converter
+
SENSE1
–
I
TH
/RUN1
V
FB1
SGND
V
FB2
I
TH
/RUN2
PLLLPF
SENSE2
–
SENSE1
+
V
IN
PGATE1
PGND
PGATE2
PGOOD
EXTCLK/MODE
SENSE2
+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC3701
C5
220pF
R8
10k
R6
78.7k
R7
169k
R1
0.03Ω
L1
4.7µH
C1
47µF
C2
10µF
R2
0.03Ω
L2
4.7µH
D1
M1
M2
D2
V
IN2
2.5V TO 9.8V
V
IN1
2.5V TO 9.8V
V
IN1
≥ V
IN2
V
OUT
2.5V
2A
3701 TA04
C3
10µF
C1: SANYO 6TPA47M
C2, C3: TAIYO YUDEN LMK325BJ106K-T
D1, D2: IR10BQ015
L1, L2: MURATA LQN6C-4R7
M1, M2: Si3443DV
R1, R2: DALE 0.25W
