28
LTC1709-85
170985f
PART NUMBER DESCRIPTION COMMENTS
LTC1438/LTC1439 Dual High Efficiency Low Noise Synchronous Step-Down Switching Regulators POR, Auxiliary Regulator
LTC1628/LTC1628-PG Dual High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator Constant Frequency, Standby, 5V and 3.3V LDOs
LTC1629/LTC1629-PG PolyPhase High Efficiency Controller Expandable Up to 12 Phases, G-28, Up to 120A
LTC1929/LTC1929-PG 2-Phase High Efficiency Controller Adjustable Output Up to 40A, G-28
LTC1702/LTC1703 Dual High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator 500kHz, 25MHz GBW
LTC1708-PG Dual High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator 1.3V ≤ V
OUT
≤ 3.5V, Current Mode Ensures
with 5-Bit VID and Power Good Indication Accurate Current Sharing, 3.5V ≤ V
IN
≤ 36V
LTC1709-7/LTC1709-8 2-Phase High Efficiency Controller with 5-Bit VID and Power Good VID Tables; Mobile, VRM 8.4 and VRM 9.0
LTC1709-9
LTC1735 High Efficiency Synchronous Step-Down Controller Burst Mode Operation, 16-Pin Narrow SSOP,
Fault Protection, 3.5V ≤ V
IN
≤ 36V
LTC1736 High Efficiency Synchronous Step-Down Controller with 5-Bit VID Output Fault Protection, Power Good, GN-24,
3.5V ≤ V
IN
≤ 36V, 0.925V ≤ V
OUT
≤ 2V
LTC1778 No R
SENSE
TM
Step-Down Synchronous Controller 4V ≤ V
IN
≤ 36V, 0.8V ≤ V
OUT
≤ V
IN
, SSOP-16
LTC3729 550kHz PolyPhase Step-Down Synchronous Controller 550kHz per Phase, Up to 12-Phase Operation,
I
OUT
= 20A per Phase
LTC3730 3-Phase, 5-Bit Intel Mobile VID Synchronous Step-Down Controller 600kHz per Phase, 0.6V ≤ V
OUT
≤ 1.75V,
IMVP-3, Integrated MOSFET Drivers
LTC3732 3-Phase Step-Down Synchronous Controller (VRM 9.0/9.1) 600kHz per Phase, 5-Bit VID, ±5% Accurate
Current Sharing, I
OUT
≤ 60A
Adaptive Power and No R
SENSE
are trademarks of Linear Technology Corporation.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2001
LT/TP 1202 2K • PRINTED IN USA
TYPICAL APPLICATIO
U
RELATED PARTS
Figure 10. 5V to 15V Input, 1.05V to 1.825V/30A Pentium
®
III Processor Power Supply with Active Voltage Positioning
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
RUN/SS
SENSE1
+
SENSE1
–
EAIN
PLLFLTR
PLLIN
FCB
I
TH
SGND
V
DIFFOUT
V
OS
–
V
OS
+
SENSE2
–
SENSE2
+
ATTENOUT
ATTENIN
VID25mV
VID0
NC
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
PGOOD
V
BIAS
VID3
VID2
VID1
1000pF
10Ω10Ω
0.22µF
LTC1709-85
M1 M2
D1
MBRS140T3
D2
MBRS140T3
V
IN
5V TO 15V
V
OUT
1.05V TO 1.825V
30A MAX
SWITCHING FREQUENCY = 200kHz
C
IN
: 5A RIPPLE CURRENT RATING REQUIRED
C
OUT
: 5 × 270µF/2V PANASONIC SP
L1 TO L2: SUMIDA CEP125-1R0MC-H 1µH
M1, M3: IRF7811W OR Si7860DP
M2, M4: IRF7811W ×2 OR Si7856DP
PENTIUM IS A REGISTERED TRADEMARK OF
INTEL CORPORATION
10µF
0.1µF
5V (OPT)
470pF
VID INPUTS
1000pF
100pF
INTV
CC
470pF
INTV
CC
0.1µF
6.98k
6.81k
10k
2.7k
26.8k
0.22µF
0.1µF
PGOOD
10Ω
100k
10Ω
C
IN
0.002Ω
0.002Ω
M3
L2
M4
170985 F11
C
OUT
+
+
L1
10Ω10Ω
