Datasheet

LTC3775
34
3775fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2009
LT 0810 REV A • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC3854 Small Footprint Wide V
IN
Range Synchronous Step-Down
DC/DC Controller
Fixed 400kHz Operating Frequency, 4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 5.25V,
2mm × 3mm QFN-12
LTC3851A/
LTC3851A-1
Wide V
IN
Range Synchronous Step-Down DC/DC Controller Phase-Lockable Fixed Operating Frequency 250kHz to 750kHz, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 5.25V, MSOP-16E, 3mm × 3mm QFN-16, SSOP-16
LTC3878/
LTC3879
No R
SENSE
™ Constant On-Time Synchronous Step-Down
DC/DC Controller
Very Fast Transient Response, t
ON(MIN)
= 43ns, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 0.9V
IN
, SSOP-16, MSOP-16E, 3mm × 3mm QFN-16
LTC3850/
LTC3850-1/
LTC3850-2
Dual 2-Phase, High Effi ciency Synchronous Step-Down
DC/DC Controllers, R
SENSE
or DCR Current Sensing and
Tracking
Phase-Lockable Fixed Operating Frequency 250kHz to 780kHz,
4V ≤ V
IN
≤ 30V, 0.8V ≤ V
OUT
≤ 5.25V
LTC3860 Dual, Multiphase Synchronous Step-Down DC/DC
Controller with Diff Amp and 3-State Output Drive
Operates with Power Blocks, DRMOS Devices or External MOSFETs
3V ≤ V
IN
≤ 24V, t
ON(MIN)
= 20ns
LTC3853 Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R
SENSE
or DCR Current Sensing and Tracking
Phase-Lockable Fixed Operating Frequency 250kHz to 750kHz,
4V ≤ V
IN
≤ 24V, V
OUT
Up to 13.5V
TYPICAL APPLICATION
Wide Input Range CPU Power Supply (Refer to Demo Board DC1290A-B)
TG
V
IN
V
IN
LTC3775
PGND
SENSE
I
LIMT
I
LIMB
INTV
CC
INTV
CC
CMDSH-4E
R
S1
(OPT)
BSC016NO4LSG
Q2
D1
(OPT)
L1
WURTH
744314110
1.1μH
Q4
(OPT)
Q3
(OPT)
1
4
23
5
Q1
INFINEON
BSC093NO4LSG
V
OUT
INTV
CC
RUNRUN
MODE
SS
C6
10nF
R16
(OPT)
R9
56.2k
BG
MODE/
SYNC
COMP
BOOST
SW
FREQ
FB
1
2
16
C3
330pF
C2
0.022μF
C8 100pF
C
IN5
0.1μF
50V
C1
0.1μF
R6
10k
1%
R1
1.62k
R15
0Ω
R5
2k
C4
4700pF
R2
31.6k
R
S2
0Ω
R
SNS2
(OPT)
R
SNS1
0.004Ω
R3 4.7
R8
0Ω
R7
1.82k
5
SGND
7
15
4
6
3
11
14
10
17
9
12
8
13
R4
10k
1%
C5
4.7μF
10V
1
4
23
5
3775 TA05
C
OUT4
100μF
6.3V
C
OUT1
470μF
4V
SANYO
POSCAP
4TPF470MU
V
OUT
V
OUT
+
V
OUT
1.2V/10A
GND
V
OUT
–
C
OUT2
470μF
4V
C
OUT5
(OPT)
E3
J3
J4
E4
C
OUT3
1μF
6.3V
X5R
+
+
+
C
IN2
4.7μF
50V
C
IN3
4.7μF
50V
V
IN
+
V
IN
5V TO 36V
GND
V
IN
–
C
IN4
(OPT)
E1
J1
J2
E2
C
IN1
100μF
50V
+
V
IN
= 5V TO 36V
V
OUT
= 1.2V/10A
F
S
= 350kHz
INTV
CC
1
2
3
4
JP1
MODE
R13 1k
MODE
PULSE-SKIPPING
SYNC
FCC
SGND
SYNC
E8
E6
V
OUT
V
IN
1
2
3
JP2
C7
(OPT)
R12
(OPT)
R14
(OPT)
ON
OFF
RUN
RUN
E7
D2