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PDF MAX1937 Data sheet ( Hoja de datos )
| Número de pieza | MAX1937 | |
| Descripción | Two-Phase Desktop CPU Core Supply Controllers with Controlled VID Change | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2498; Rev 1; 10/02
Two-Phase Desktop CPU Core Supply Controllers
with Controlled VID Change
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
Typical Application Circuits and Functional Diagram appear
at end of data sheet.
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.
Features
o ±0.75% Output Voltage Accuracy
o Instant Load-Transient Response
o Up to 90% Efficiency Eliminates Heatsinks
o Up to 60A Output Current
o 8V to 24V Input Range
o User-Programmable Voltage Positioning
o Controlled VID Voltage Transition
o 500kHz Effective Switching Frequency
o MAX1937: AMD Hammer Compatible
o MAX1938: Intel VRM 9.0/9.1 Compatible
o MAX1939: AMD Athlon Mobile Compatible
o Soft-Start
o Power-Good (PWRGD) Output
o Cycle-by-Cycle Current Limit
o Output Overvoltage Protection (OVP)
o RDS(ON) or RSENSE Current Sensing
o Remote Voltage Sensing
o 28-Pin QSOP Package
Ordering Information
PART
MAX1937EEI
MAX1938EEI
MAX1939EEI
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
28 QSOP
28 QSOP
Pin Configuration
TOP VIEW
VID0 1
VID1 2
TIME 3
VID2 4
VID3 5
VID4 6
VPOS 7
VDD 8
ILIM 9
GND 10
GNDS 11
REF 12
EN 13
FB 14
MAX1937
MAX1938
MAX1939
QSOP
28 VCC
27 BST1
26 DH1
25 LX1
24 CS1
23 DL1
22 VLG
21 PGND
20 DL2
19 CS2
18 LX2
17 DH2
16 BST2
15 PWRGD
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Two-Phase Desktop CPU Core Supply Controllers
with Controlled VID Change
ELECTRICAL CHARACTERISTICS
(VVCC = 12V, VEN = VVDD = 5V, PGND = GNDS = GND, VID_= GND, CVPOS = 47pF, CREF = 0.1µF, VILIM = 1V, TA = -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
GENERAL
VCC Operating Range
VDD Operating Range
VLG Operating Range
VCC Operating Supply Current
VDD Operating Supply Current
VLG Operating Supply Current
VCC Shutdown Current
VDD Shutdown Current
VLG Shutdown Current
TIME Output Voltage
ILIM Input Bias
VPOS Output Voltage
REFERENCE
Reference Voltage
SOFT-START
Ramp Period
ERROR AMPLIFIER
GNDS Input Bias Current
CONDITIONS
MAX1937
MAX1938/MAX1939
VVLG ≥ VVDD
FB above threshold (no switching)
FB above threshold (no switching)
FB above threshold (no switching)
EN = GND
EN = GND, VID_ not connected
EN = GND
VILIM = 1V
CS_ = GND, VPOS connected to REF through a 75kΩ
resistor
-50µA ≤ IREF ≤ 50µA
MAX1937
MAX1938
MAX1939
MIN TYP MAX UNITS
6
8
4.5
4.5
20
1.96
-250
1.96
24
24
5.5
6.5
40
2.5
60
5
100
5
2.04
+250
2.04
V
V
V
µA
mA
µA
µA
µA
µA
V
nA
V
1.98 2.02 V
1.1 5.5
1.5 6.6 ms
1.3 7.0
-5 +5 µA
Output Regulation Voltage
Accuracy
FAULT PROTECTION
-1 +1 %
VDD UVLO Threshold
Rising or falling VDD
4.00 4.45 V
VLG UVLO Threshold
Output Overvoltage Fault
Threshold
Output UVLO Threshold
CURRENT LIMIT
Current-Limit Threshold
Rising or falling VLG
MAX1937/MAX1938
Rising and falling
MAX1939
Rising and falling percentage of the nominal
regulation voltage
PGND to CS_, VILIM = 1.5V
PGND to CS_, VILIM = 1V
PGND to CS_, VILIM = 0.5V
4.00
1.97
2.215
65
135
90
45
4.45
2.03
2.285
75
V
V
%
165
110 mV
55
_______________________________________________________________________________________ 5
5 Page 
Two-Phase Desktop CPU Core Supply Controllers
with Controlled VID Change
Pin Description
PIN NAME
FUNCTION
1
VID0
Voltage Identification Input Bit 0. See Table 1. Internal 100kΩ pullup resistor to VDD.
2
VID1
Voltage Identification Input Bit 1. See Table 1. Internal 100kΩ pullup resistor to VDD.
3
TIME
Connect to an external resistor (47kΩ to 470kΩ) for VID change slew-rate control.
4
VID2
Voltage Identification Input Bit 2. See Table 1. Internal 100kΩ pullup resistor to VDD.
5
VID3
Voltage Identification Input Bit 3. See Table 1. Internal 100kΩ pullup resistor to VDD.
6
VID4
Voltage Identification Input Bit 4. See Table 1. Internal 100kΩ pullup resistor to VDD.
Voltage Positioning. Connect a resistor between VPOS and REF to set the output voltage-positioning
7
VPOS
droop, or connect directly to REF for no output voltage positioning. Connect a 47pF capacitor from
VPOS to GND.
8 VDD IC Analog Power-Supply Input. Connect a 5V supply to VDD.
Current-Limit Threshold per Phase. Connect ILIM to VDD to set a default current limit of 120mV, or
9 ILIM connect to a voltage-divider from REF to GND to adjust the current limit. See the Setting the Current
Limit section.
10
GND
Ground
11
GNDS
Remote Ground Sense. Connect GNDS to the output ground at the load. For VRM applications, also
connect a 100Ω resistor from GNDS to PGND locally.
12 REF Reference Output. Connect a 0.1µF capacitor from REF to GND.
13 EN Enable Input. Leave unconnected or drive high for normal operation. Drive low for shutdown.
14
FB
Remote Feedback Sense. Connect FB to the output at the load. For VRM applications, also connect
a 100Ω resistor from FB to the output locally.
Power-Good Output. Open-drain output is high impedance when the output is in regulation and
15
PWRGD
pulled low when the output deviates more than 12.5% from the voltage set by the VID code. PWRGD
is also low in shutdown or during any fault condition. To use as a logic output, connect a pullup
resistor from PWRGD to the logic supply.
High-Side MOSFET Gate-Driver Bootstrap Input. Connect 0.22µF or higher value bypass capacitor
16
BST2
from BST2 to LX2. Keep trace length as short as possible. Connect a Schottky diode between BST2
and VLG. See the Selecting a BST Capacitor section.
17
DH2
High-Side MOSFET Gate-Drive Output. Connect to the high-side MOSFET gate. DH2 is pulled low in
shutdown.
18 LX2 Inductor Connection. Connect to the switched side of the inductor.
19
CS2
Negative Current-Sense Input. Connect to a current-sense resistor in series with the low-side
MOSFET, or connect to LX2 to use the low-side MOSFET’s on-resistance for current sensing.
20
DL2
Low-Side MOSFET Gate-Driver Output. Connect to the low-side MOSFET gate. DL2 is pulled low in
shutdown.
21
PGND
Power Ground. Connect to power ground at the point where the current-sense resistors or low-side
MOSFET sources connect. PGND is used as the positive current-sense connection.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX1937.PDF ] | |
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