LTC3770
24
3770fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2004
LT 0209 REV C • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LTC1622 550kHz Step-Down Controller 8-Pin MSOP; Synchronizable; Soft-Start; Current Mode
LTC1625/LTC1775 No R
SENSE
Current Mode Synchronous Step-Down Controller 97% Effi ciency; No Sense Resistor; 16-Pin SSOP
LTC1628/LTC3728 Dual, 2-Phase Synchronous Step-Down Controller Power Good Output; Minimum Input/Output Capacitors;
3.5V ≤ V
IN
≤ 36V
LTC1735 High Effi ciency, Synchronous Step-Down Controller Burst Mode
®
Operation; 16-Pin Narrow SSOP;
3.5V ≤ V
IN
≤ 36V
LTC1736 High Effi ciency, Synchronous Step-Down Controller with 5-Bit VID Mobile VID; 0.925V ≤ V
OUT
≤ 2V; 3.5V ≤ V
IN
≤ 36V
LTC1772 SOT-23 Step-Down Controller Current Mode; 550kHz; Very Small Solution Size
LTC1773 Synchronous Step-Down Controller Up to 95% Effi ciency, 550kHz, 2.65V ≤ V
IN
≤ 8.5V,
0.8V ≤ V
OUT
≤ V
IN
, Synchronizable to 750kHz
LTC1778 Wide Range, No R
SENSE
Synchronous Step-Down Controller GN16-Pin, 0.8V
FB
Reference
LTC1876 2-Phase, Dual Synchronous Step-Down Controller with
Step-Up Regulator
3.5V ≤ V
IN
≤ 36V, Power Good Output, 300kHz Operation
LTC3708 Dual, 2-Phase, No R
SENSE
Synchronous Step-Down Controller with
Output Tracking
Fast Transient Response Reduces C
OUT
; 4V ≤ V
IN
≤ 36V,
0.6V ≤ V
OUT
≤ 6V; 2-Phase Operation Reduces C
IN
LTC3713 Low V
IN
High Current Synchronous Step-Down Controller 1.5V ≤ V
IN
≤ 36V, 0.8V ≤ V
OUT
≤ (0.9)V
IN
, I
OUT
Up to 20A
LTC3731 3-Phase Synchronous Step-Down Controller 600kHz; Up to 60A Output
LTC3778 Low V
OUT
, No R
SENSE
Synchronous Step-Down Controller 0.6V ≤ V
OUT
≤ (0.9)V
IN
, 4V ≤ V
IN
≤ 36V, I
OUT
Up to 20A
Burst Mode is a trademark of Linear Technology Corporation.
Typical Application 2.5V/10A Synchronized at 450kHz
R8
51k
R7
47k
INTV
CC
24
23
22
21
20
19
18
17
91011 1213141516
32 31 30 29 28 27 26 25
1
2
3
4
5
6
7
8
PLLFLTR PLLIN
PLLIN
V
IN
V
INSNS
ZV
IN
LTC3770EUH
3770 TA02b
PGOOD V
ON
RUN FCB
FCB
V
REFOUT
MPGM TRACK/SS
Z0 BOOST TG SW
SENSE+
SENSE–
PGND
BG
DRV
CC
INTV
CC
Z2
Z1
V
RNG
V
FB
I
TH
SGND
R1
30.1k
R2
95.3k
CC1
1000pF
MARGIN1
V
REFIN
I
ON
MARGIN0
MARGIN1
RUN
PGOOD
MARGIN0
R
ON
75k
R5
10k
R
C
10k
R6
82k
R
PL
10k
RV
IN
10Ω
R
RUN
51k
R4
39k
R3
11k
R
PG
100k
CC2
100pF
C
F
220pF
CV
IN
0.01μF
0.1μF
C
SS
0.1μF
M1
PH3230
CV
CC
4.7μF
DB
CMDSH-3
D1
B340A
C
IN
10μF
50V
x3
V
OUT
2.5V
10A
V
IN
5V TO 28V
CB
0.22μF
M2
PH3230
L1
1.8μH
C
OUT3
22μF
X5R
x2
C
OUT
180μF
4V
x2
+
C
P
1000pF
C
PL
0.01μF
C
IN
: TDK C4532X5R1H685M
C
OUT
: PANASONIC EEFUE0G181R
L1: BI TECH 1.8μH HM65-H1R8-TB
M1, M2: PHILIPS PH3230
1000pF
