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MAX1937EEI+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
General Description
The MAX1937/MAX1938/MAX1939 comprise a family of
synchronous, two-phase, step-down controllers capable
of delivering load currents up to 60A. The controllers uti-
lize Quick-PWM™ control architecture in conjunction with
active load-current voltage positioning. Quick-PWM con-
trol provides instantaneous load-step response, while
programmable voltage positioning allows the converter
to utilize full transient regulation limits, reducing the out-
put capacitance requirement. The two phases operate
180° out-of-phase with an effective 500kHz switching fre-
quency, thus reducing input and output current ripple, as
well as reducing input filter capacitor requirements.
The MAX1937/MAX1938/MAX1939 are compliant with
AMD Hammer, Intel
®
‚ Voltage-Regulator Module (VRM)
9.0/9.1, and AMD Athlon™ Mobile VID code specifica-
tions (see Table 1 for VID codes). The internal DAC pro-
vides ultra-high accuracy of ±0.75%. A controlled VID
voltage transition is implemented to minimize both
undervoltage and overvoltage overshoot during VID
input change.
Remote sensing is available for high output-voltage
accuracy. The MOSFET switches are driven by a 6V
gate-drive circuit to minimize switching and crossover
conduction losses to achieve efficiency as high as
90%. The MAX1937/MAX1938/MAX1939 feature cycle-
by-cycle current limit to ensure that the current limit is
not exceeded. Crowbar protection is available to pro-
tect against output overvoltage.
Applications
Notebook and Desktop Computers
Servers and Workstations
Blade Servers
High-End Switches
High-End Routers
Macro Base Stations
Features
♦ ±0.75% Output Voltage Accuracy
♦ Instant Load-Transient Response
♦ Up to 90% Efficiency Eliminates Heatsinks
♦ Up to 60A Output Current
♦ 8V to 24V Input Range
♦ User-Programmable Voltage Positioning
♦ Controlled VID Voltage Transition
♦ 500kHz Effective Switching Frequency
♦ MAX1937: AMD Hammer Compatible
♦ MAX1938: Intel VRM 9.0/9.1 Compatible
♦ MAX1939: AMD Athlon Mobile Compatible
♦ Soft-Start
♦ Power-Good (PWRGD) Output
♦ Cycle-by-Cycle Current Limit
♦ Output Overvoltage Protection (OVP)
♦ R
DS(ON)
or R
SENSE
Current Sensing
♦ Remote Voltage Sensing
♦ 28-Pin QSOP Package
MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
________________________________________________________________ Maxim Integrated Products 1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V
CC
BST1
DH1
LX1
CS1
DL1
PWRGD
VLG
PGND
DL2
CS2
LX2
DH2
BST2
FB
EN
REF
GNDS
GND
ILIM
V
DD
VPOS
VID4
VID3
VID2
TIME
VID1
VID0
QSOP
TOP VIEW
MAX1937
MAX1938
MAX1939
Pin Configuration
Ordering Information
19-2498; Rev 1; 10/02
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX1937EEI -40°C to +85°C 28 QSOP
MAX1938EEI -40°C to +85°C 28 QSOP
MAX1939EEI -40°C to +85°C 28 QSOP
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Athlon is a trademark of Advanced Micro Devices, Inc.
Intel is a registered trademark of Intel Corp.
Typical Application Circuits and Functional Diagram appear
at end of data sheet.
MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
CC
to GND............................................................-0.3V to +28V
V
DD
, PWRGD, ILIM, FB to GND ...............................-0.3V to +6V
EN, GNDS, VPOS, REF, VID_,
TIME to GND ............................................0.3V to V
VDD
+ 0.3V
PGND to GND .......................................................-0.3V to +0.3V
CS1, CS2 to GND ......................................................-2V to +28V
VLG to GND..............................................................-0.3V to +7V
BST1, BST2 to GND ...............................................-0.3V to +35V
LX1 to BST1..............................................................-7V to +0.3V
LX2 to BST2..............................................................-7V to +0.3V
DH1 to LX1.................................................-0.3V to V
BST1
+ 0.3V
DH2 to LX2.................................................-0.3V to V
BST2
+ 0.3V
DL1, DL2 to PGND ......................................-0.3V to V
VLG
+ 0.3V
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QSOP (derate 20.8mW/°C above +70°C)......860.2mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
CC
= 12V, V
EN
= V
VDD
= 5V, PGND = GNDS = GND = 0, VID_ = GND, C
VPOS
= 47pF, C
REF
= 0.1µF, V
ILIM
= 1V, T
A
= 0°C to
+85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
GENERAL
MAX1937 6 24
V
CC
Operating Range
MAX1938/MAX1939 8 24
V
V
DD
Operating Range 4.5 5 5.5 V
VLG Operating Range V
VLG
> V
VDD
4.5 6.5 V
V
CC
Operating Supply Current FB above threshold (no switching) 20 40 µA
V
DD
Operating Supply Current FB above threshold (no switching) 1.4 2.5 mA
VLG Operating Supply Current FB above threshold (no switching) 20 60 µA
V
CC
Shutdown Current EN = GND <1 5 µA
V
DD
Shutdown Current EN = GND, VID_ not connected 50
100
µA
VLG Shutdown Current EN = GND <1 5 µA
TIME Output Voltage
1.96 2.00 2.04
V
ILIM Input Bias V
ILIM
= 1.5V
-250
+250
nA
VPOS Output Voltage
CS_= GND, VPOS connected to REF through a 75kΩ
resistor
1.96
2.0
2.04
V
REFERENCE
Reference Voltage -50µA ≤ I
REF
≤ 50µA
1.987 2.000 2.013
V
SOFT-START
MAX1937 1.1 5.5
MAX1938 1.5 6.2 Ramp Period
MAX1939 1.3 6.5
ms
Soft-Start Voltage Step 25 mV
ERROR AMPLIFIER
FB Input Resistance Resistance from FB to GND
180
kΩ
GNDS Input Bias Current -5 +5 µA
Output Regulation Voltage
Accuracy
-0.75
+0.75
%
MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 12V, V
EN
= V
VDD
= 5V, PGND = GNDS = GND = 0, VID_ = GND, C
VPOS
= 47pF, C
REF
= 0.1µF, V
ILIM
= 1V, T
A
= 0°C to
+85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
FAULT PROTECTION
V
DD
Undervoltage Lockout
(UVLO) Threshold
Rising or falling V
DD
4.00 4.25 4.45
V
V
DD
UVLO Hysteresis 80 mV
VLG UVLO Threshold Rising or falling VLG
4.00 4.25 4.45
V
VLG UVLO Hysteresis 40 mV
Thermal Shutdown Rising temperature, typical hysteresis = 15°C
160
°C
Rising edge
1.600
Reference UVLO Threshold
Falling edge
1.584
V
MAX1937/MAX1938
1.97 2.00 2.03
Output Overvoltage Fault
Threshold
Rising and falling
MAX1939
2.215 2.250 2.285
V
Output UVLO Threshold
Rising and falling percentage of the nominal
regulation voltage
65 70 75 %
CURRENT LIMIT
PGND to CS_, V
ILIM
= 1.5V
135 150 165
PGND to CS_, V
ILIM
= 1V 90
100 110
Current-Limit Threshold
PGND to CS_, V
ILIM
= 0.5V 45 50 55
mV
CS Input Offset Voltage CS_ = GND -3 +3 mV
CS_ Input Bias Current CS_ = GND -5 +5 µA
VOLTAGE POSITIONING
VPOS Input Offset Voltage -3 +3 mV
VPOS Gain
From CS_ to FB; V
CS1
, V
CS2
= 0, -100mV; R
VPOS
= 75kΩ 72.5 75.0 77.5
%/V
VPOS Gain
From CS1, CS2 to FB; V
CS1
, V
CS2
= +13mV, -113mV;
R
VPOS
= 75kΩ
68 75 82 %/V
TIMER AND DRIVERS
On-Time LX1 = LX2 = CS1 = CS2 = GND, V
FB
= 1.5V
420 525 630
ns
Minimum Off-Time DH1 low to DH2 high, and DH2 low to DH1 high
260 325 390
ns
MAX1937/MAX1938 60
DH_ low to DL_ high
MAX1939
60
MAX1937/MAX1938 85
Break-Before-Make Time
DL_ low to DH_ high
MAX1939
70
ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

MAX1937EEI+

Mfr. #:
Buy MAX1937EEI+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers 2-Phase Desktop CPU Core Supply Ctlr
Lifecycle:
New from this manufacturer.
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