Datasheet
LTC3773
32
3773fb
SENSE2
+
SENSE2
–
TRACK3
TRACK2
V
FB3
V
FB2
I
TH3
I
TH2
SGND
LTC3773
I
TH1
V
FB1
TRACK1
PGOOD
10k
10Ω
10Ω
PGND
SDB3
V
DR
BG2
BG1
SW3
TG3
BOOST3
BOOST2
TG2
SW2
SW1
TG1
BOOST1
39
POWER DOWN V
OUT1
L1:
TDK RLF7030T-2R2M5R4
L2, L3:
TDK RLF7030T-1R5M5R4
C
OUT1
C
OUT2
C
OUT3
,:
SANYO POSCAP 4TPE220MF
POWER DOWN V
OUT2
POWER DOWN V
OUT3
SDB2
38
SDB1
37
SENSE1
–
36
SENSE1
+
35
1000pF
PHASEMD
34
PGOOD
SENSE3
–
SENSE3
+
V
CC
PLLFLTR
PLLIN/FC
CLKOUT
BG3
33 32
13 14 15 16 17 18 19
31
30
29
28
27
26
25
24
23
22
21
20
1
2
3
4
5
6
7
8
9
10
11
12
+
3773 TA02
1
8 Si4816BDY
22μF
X5R
0.1μF
0.1μF
CMDSH-3
CMDSH-3
CMDSH-3
0.1μF
V
IN
4.5V TO 14V
47μF
16V
C
OUT1
220μF
4V
V
OUT1
3.3V/5A
7mΩ
L1
2.2μH
5
4
2, 3
6, 7
+
4.7μF
4.7μF
16V
+
+
1
8 Si4816BDY
22μF
X5R
V
IN
4.7μF
16V
C
OUT2
220μF
4V
V
OUT2
2.5V/5A
7mΩ
L2
1.5μH
5
4
2, 3
6, 7
+
1
8 Si4816BDY
22μF
X5R
V
IN
4.7μF
16V
C
OUT3
220μF
4V
V
OUT3
1.8V/5A
7mΩ
L3
1.5μH
5
4
2, 3
6, 7
+
10k
20k
20k
10Ω
10Ω
10Ω
10Ω
10Ω
31.6k
8.2k
5.9k
10k
0.01μF
1nF
0.01μF
150pF
150pF
150pF
1nF
1nF
1000pF
1000pF
68.1k
0.01μF
2.2μF
0.1μF
15k
V
CC
4.5V TO 6V
TYPICAL APPLICATION
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2006
LT 0907 REV B • PRINTED IN USA
PART NUMBER DESCRIPTION COMMENTS
LTC3407-2 Dual Synchronous, 800mA, 2.25MHz Step-Down Monolithic
DC/DC Regulator
V
IN
: 2.5V to 5.5V, V
OUT
: 0.6V to 5V, 100% Maximum Duty Cycle
LTC3417A Dual Synchronous Step-Down Monolithic 1.5A/1A V
IN
: 2.25V to 5.5V, V
OUT
: 0.8V to 5V, 100% Maximum Duty Cycle
LTC3703 High Input Synchronous Step-Down Controller V
IN
≤ 100V
LTC3708 No R
SENSE
TM
, Dual, 2-Phase Synchronous Step-Down Controller
with Output Tracking
Very Low Duty Factor Operation, Programmable Output Voltage
Voltage Up/Down Tracking
LTC3727 Dual Output 2-Phase Current Mode Synchronous DC/DC Step-
Down Switching Regulator Controller
V
IN
: 4V to 36V, V
OUT
: 0.8V to 14V, 99% Maximum Duty Cycle,
Selectable Burst Mode Operation
LTC3728 Dual PolyPhase
®
Synchronous Step-Down Switching Regulator Dual Output, Current Mode
LTC3729 20A to 200A, 500kHz PolyPhase Synchronous Controller Expandable from 2-Phase, Uses All Surface Mount Components,
V
IN
up to 36V
LTC3731 3- to 12-Phase Step-Down Synchronous Controller Single Output, 60A to 240A Output Current, 0.6V ≤ V
OUT
≤ 6V,
4.5V ≤ V
IN
≤ 32V
LTC3778 Wide Operating Range, No R
SENSE
Step-Down Controller Single Channel, Separate V
ON
Programming
LTC3802 Dual PolyPhase Voltage Mode Synchronous Step-Down
Switching Regulator with Output Tracking
Very Low Duty Factor Operation, Programmable Output Voltage
Up/Down Tracking, V
IN
Up to 30V
LTC3827 Low I
Q
, Dual, 2-Phase Synchronous Step-Down Controller Low 80μA I
Q
, 0.8V ≤ V
OUT
≤ 10V, 4V ≤ V
IN
≤ 36V
No R
SENSE
is a trademark of Linear Technology Corporation. PolyPhase is a registered trademark of Linear Technology Corporation.
RELATED PARTS
Figure 12. High Effi ciency, Small Footprint Triple Output Step-Down Converter