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MAX1937EEI+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
4 _______________________________________________________________________________________
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
DH_ On-Resistance in Low State
V
BST1
= V
BST2
= 6V, LX1 = LX2 = GND 1.5 3.0 Ω
DH_ On-Resistance in High State
V
BST_
= 6V, LX_ = GND 1.5 3.0 Ω
DL_ On-Resistance in Low State
0.5 1.7 Ω
DL_ On-Resistance in High State
1.5 3.0 Ω
BST_ Leakage Current V
BST_
= 30V, V
LX_
= 24V 50 µA
LX_ Leakage Current V
BST_
= 30V, V
LX_
= 24V 50 µA
EN AND VID
Low Level Threshold 0.8 V
High Level Threshold 1.6 V
Pullup Resistance Internally pulled up to V
DD
50
100 200
kΩ
PWRGD
PWRGD Upper Trip Level
10.0 12.5 15.0
%
PWRGD Lower Trip Level -15
-12.5
-10 %
Output Low Level 0.4 V
Output High Leakage 1 µA
CONTROLLED VID CHANGE
R
TIME
= 120kΩ
6.17 6.67 7.25
R
TIME
= 47kΩ
2.35 2.63 2.99
On-the-Fly VID Change Slew
Rate
25mV per step
R
TIME
= 470kΩ
23.5 26.3 29.9
µs
VID_ Change Frequency Range
38
380
kHz
PWRGD Blanking Time V
VDD
= 4.5V to 5.5V
125 200 350
µs
MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS
(V
VCC
= 12V, V
EN
= V
VDD
= 5V, PGND = GNDS = GND, VID_= GND, C
VPOS
= 47pF, C
REF
= 0.1µF, V
ILIM
= 1V, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
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 V
VLG Operating Range V
VLG
≥ V
VDD
4.5 6.5 V
V
CC
Operating Supply Current FB above threshold (no switching) 40 µA
V
DD
Operating Supply Current FB above threshold (no switching) 2.5 mA
VLG Operating Supply Current FB above threshold (no switching) 20 60 µA
V
CC
Shutdown Current EN = GND 5 µA
V
DD
Shutdown Current EN = GND, VID_ not connected
100
µA
VLG Shutdown Current EN = GND 5 µA
TIME Output Voltage
1.96
2.04
V
ILIM Input Bias V
ILIM
= 1V
-250
+250
nA
VPOS Output Voltage
CS_ = GND, VPOS connected to REF through a 75kΩ
resistor
1.96
2.04
V
REFERENCE
Reference Voltage -50µA ≤ I
REF
≤ 50µA
1.98
2.02
V
SOFT-START
MAX1937 1.1 5.5
MAX1938 1.5 6.6 Ramp Period
MAX1939 1.3 7.0
ms
ERROR AMPLIFIER
GNDS Input Bias Current -5 +5 µA
Output Regulation Voltage
Accuracy
-1 +1 %
FAULT PROTECTION
V
DD
UVLO Threshold Rising or falling V
DD
4.00
4.45
V
VLG UVLO Threshold Rising or falling VLG
4.00
4.45
V
MAX1937/MAX1938
1.97
2.03
Output Overvoltage Fault
Threshold
Rising and falling
MAX1939
2.215
2.285
V
Output UVLO Threshold
Rising and falling percentage of the nominal
regulation voltage
65 75 %
CURRENT LIMIT
PGND to CS_, V
ILIM
= 1.5V
135
165
PGND to CS_, V
ILIM
= 1V 90
110
Current-Limit Threshold
PGND to CS_, V
ILIM
= 0.5V 45 55
mV
MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
VCC
= 12V, V
EN
= V
VDD
= 5V, PGND = GNDS = GND, VID_= GND, C
VPOS
= 47pF, C
REF
= 0.1µF, V
ILIM
= 1V, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
CS Input Offset Voltage CS_ = GND -5 +5 mV
CS_ Input Bias Current CS_ = GND -5 +5 µA
VOLTAGE POSITIONING
VPOS Input Offset Voltage -5 +5 mV
VPOS Gain
From CS_ to FB; V
CS1
, V
CS2
= 0, -100mV; R
VPOS
= 75kΩ 72.5
77.5
%/V
VPOS Gain
From CS1, CS2 to FB; V
CS1
, V
CS2
= +13mV, -113mV;
R
VPOS
= 75kΩ
68 82 %/V
TIMER AND DRIVERS
On-Time LX1 = LX2 = CS1 = CS2 = GND, V
FB
= 1.5V
420
630
ns
Minimum Off-Time DH1 low to DH2 high, and DH2 low to DH1 high
260
390
ns
DH_ On-Resistance in Low State
V
BST1
= V
BST2
= 6V, LX1 = LX2 = GND 3 Ω
DH_ On-Resistance in High State
V
BST_
= 6V, LX_ = GND 3 Ω
DL_ On-Resistance in Low State
1.7 Ω
DL_ On-Resistance in High State
3 Ω
BST_ Leakage Current V
BST_
= 30V, V
LX_
= 24V 50 µA
LX_ Leakage Current V
BST_
= 30V, V
LX_
= 24V 50 µA
EN AND VID_
Low Level Threshold 0.8 V
High Level Threshold 1.6 V
Pullup Resistance Internally pulled up to V
DD
50
200
kΩ
PWRGD
PWRGD Upper Trip Level 10 15 %
PWRGD Lower Trip Level -15 -10 %
Output Low Level 0.4 V
Output High Leakage 1 µA
CONTROLLED VID CHANGE
R
TIME
= 120kΩ
6.17
7.25
R
TIME
= 47kΩ
2.35
2.99
On-the-Fly VID Change Slew
Rate
25mV per step
R
TIME
= 470kΩ
23.5
29.9
µs
VID_ Change Frequency Range
38
380
kHz
PWRGD Blanking Time V
VDD
= 4.5V to 5.5V
125
350
µs
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
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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