MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
22 ______________________________________________________________________________________
CONTROL
LOGIC
ON-TIME
COMPUTE
CURRENT
BALANCE
CURRENT
LIMIT
UVLO/
OVLO
VCC
CS1
CS2
CS1
CS2
FB
VLG
BST1
DH1
LX1
VLG
DL1
PGND
BST2
DH2
LX2
DL2
DL2
DL2
ON-TIME
ONE-SHOT
BIAS
ENABLE/
SHUTDOWN
MIN OFF
TIME
ONE-SHOT
VDD
PWRGD
VPOS
REF
FB
2V
GNDS
ERROR AMP
VID DAC
GND VID0–VID4 TIME ILIM
REF - 12.5%
REF + 12.5%
EN
g
m
Functional Diagram
MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
______________________________________________________________________________________ 23
R2
100kΩ
V
CC
V
DD
VID4
EN
GNDS
TIME
VPOS
GND
REF
BF
PWRGD
LX2
DH2
ILIM
GNDS
10 × 10μF CERAMIC CAPACITORS
TAIYO YUDEN TMK432BJ106MM
AND 4 × 330μF
SANYO 25MV330WX
6 × 560μF/4V OS-CAN CAPACITORS
SANYO SP560M
AND 2 × 1μF CERAMIC CAPACITORS
TAIYO YUDEN: LMK212BJ105MG
CVLG
1μF
C3
2.2μF
C
VDD
0.01μF
VID4
EN
N2
N3
L2
0.5μH
BI TECHNOLOGIES HM73-40R50
IR: 2 × 1RLR7811W
FAIRCHILD
2 × 1SL9N303AS3ST
D2
CENTRAL CMPSH-3A
FAIRCHILD
2 × 1SL9N303AS3ST
R5
10kΩ
R4
82.5kΩ
C
REF
0.47μF
C
VPOS
47pF
R3
200kΩ
R1
10Ω
PWRGD
V
OUT
FB
VDD
L1
0.5μH
BI TECHNOLOGIES HM73-40R50
C1
2.2μF
R
VPOS
51.1kΩ
R
TIME
120kΩ
U1
MAX1938
R6
10kΩ
28
8
6
13
VID2
VID3
VID2
VID1
VID0
D1
GND
U2
KA78M06
CENTRAL
CMHD4448
2
3
2
OUTIN
11
VID3
4
5
VID0
VID1
1
2
3
7
12
9
10
11
18
17
14
1
2
2
2
C
BST2
0.22μF
CBST1
0.22μF
3
DL2
N4
20
CS2
19
PGND
21
VLG
CS1
22
24
DL1
23
BST1
27
LX1
25
DH1
26
BST2
16
1
1
1
1
3
3
N3
2
3
N1
C
IN
INPUT: 8V TO 14V
OUTPUT
0.8V TO 1.55V
60A
3
2
13
V
IN
VDD
1mΩ
R
CS2
1mΩ
R
CS1
C2
2.2μF
V
IN
IR: 3X1RLR7811W
IR: 3 × 1RLR7811W
MAX1938 Typical Application Circuit
MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
QSOP.EPS
F
1
1
21-0055
PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH

MAX1937EEI+

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
Switching Controllers 2-Phase Desktop CPU Core Supply Ctlr
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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