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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
_______________________________________________________________________________________ 7
EFFICIENCY vs. LOAD CURRENT
AT 1.45V OUTPUT
MAX1937 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
10
60
70
80
90
50
1 100
V
IN
= 8V
V
IN
= 14V
V
IN
= 12V
V
OUT
= 1.45V
50
60
70
80
90
1 10 100
EFFICIENCY vs. LOAD CURRENT
AT 1.85V OUTPUT
MAX1937 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
V
IN
= 12V
V
IN
= 14V
V
OUT
= 1.85V
V
IN
= 8V
FREQUENCY vs. LOAD CURRENT
MAX1937 toc03
LOAD CURRENT (A)
FREQUENCY (kHz)
5040302010
50
100
150
200
250
300
350
0
060
V
IN
= 12V
V
OUT
= 1.45V
FREQUENCY vs. INPUT VOLTAGE
MAX1937 toc04
INPUT VOLTAGE (V)
FREQUENCY (kHz)
131211109
175
200
225
250
275
300
325
150
814
I
LOAD
= 46A
V
OUT
= 1.45V
I
LOAD
= 1A
FREQUENCY vs. TEMPERATURE
MAX1937 toc05
TEMPERATURE (
°
C)
FREQUENCY (kHz)
8060-20 0 20 40
225
230
235
240
245
250
255
260
220
-40 100
V
IN
= 12V
V
OUT
= 1.45V
I
LOAD
= 10A
V
CC
INPUT CURRENT
vs. INPUT VOLTAGE
MAX1937 toc06
INPUT VOLTAGE (V)
V
CC
INPUT CURRENT (μA)
131211109
5
10
15
20
25
0
814
V
OUT
= 1.45V
V
DD
CURRENT vs. V
DD
VOLTAGE
MAX1937 toc07
V
DD
VOLTAGE (V)
V
DD
CURRENT (mA)
5.35.14.94.7
1.55
1.60
1.65
1.70
1.75
1.80
1.50
4.5 5.5
Typical Operating Characteristics
(V
IN
= 12V, V
OUT
= 1.45V, T
A
= +25°C, unless otherwise noted.)
MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
IN
= 12V, V
OUT
= 1.45V, T
A
= +25°C, unless otherwise noted.)
CURRENT SHARING
MAX1937 toc10
LOAD CURRENT (A)
INDUCTOR CURRENTS (A)
40302010
0
5
10
15
20
25
30
-5
050
V
IN
= 12V
V
OUT
= 1.45V
T
A
= +25
°
C
CURRENT SHARING
MAX1937 toc11
LOAD CURRENT (A)
INDUCTOR CURRENTS (A)
40302010
0
5
10
15
20
25
30
-5
050
V
IN
= 12V
V
OUT
= 1.45V
T
A
= +80
°
C
V
IN
= 12V
V
OUT
= 1.45V
I
OUT
= 0A
0A
OUTPUT INDUCTOR
CURRENTS:
10A/div
OUTPUT RIPPLE
VOLTAGE:
20mV/div
2μs/div
MAX1937 toc12
INDUCTOR CURRENT WAVEFORMS
WITH 0A LOAD
V
IN
= 12V
V
OUT
= 1.45V
I
OUT
= 40A
OUTPUT INDUCTOR
CURRENTS:
10A/div
OUTPUT RIPPLE
VOLTAGE:
20mV/div
2μs/div
MAX1937 toc13
INDUCTOR CURRENT WAVEFORMS
WITH 40A LOAD
0A
OUTPUT VOLTAGE vs. LOAD CURRENT
AT 1.45V OUTPUT
MAX1937 toc09
LOAD CURRENT (A)
V
OUT
40302010
1.375
1.400
1.425
1.450
1.350
050
R
VPOS
= 90.9k
Ω
V
IN
= 12V
R
VPOS
= 120k
Ω
V
DD
CURRENT vs. V
DD
VOLTAGE
IN SHUTDOWN
MAX1937 toc08
V
DD
VOLTAGE (V)
V
DD
CURRENT (mA)
5.35.14.94.7
35
40
45
50
55
65
60
70
30
4.5 5.5
VID_ NOT CONNECTED
ENABLE SIGNAL
OUTPUT VOLTAGE:
0.5V/div
POK SIGNAL
20ms/div
MAX1937 toc18
SHUTDOWN WAVEFORM
WITH 40A LOAD
INDUCTOR CURRENT:
10A/div
MAX1937/MAX1938/MAX1939
Two-Phase Desktop CPU Core Supply
Controllers with Controlled VID Change
_______________________________________________________________________________________ 9
CURRENT-SENSE THRESHOLD vs. V
ILIM
MAX1937 toc19
V
ILIM
(V)
CURRENT-SENSE THRESHOLD (mV)
1.31.10.90.7
60
80
100
120
140
160
40
0.5 1.5
V
IN
= 12V
V
OUT
= 1.45V
T
A
= +25
°
C
T
A
= +80
°
C
Typical Operating Characteristics (continued)
(V
IN
= 12V, V
OUT
= 1.45V, T
A
= +25°C, unless otherwise noted.)
ENABLE SIGNAL
OUTPUT VOLTAGE:
0.5V/div
POK SIGNAL
1ms/div
MAX1937 toc16
SOFT-START WAVEFORMS
WITH 40A LOAD
INDUCTOR CURRENT:
10A/div
ENABLE SIGNAL
OUTPUT VOLTAGE:
0.5V/div
POK SIGNAL
20ms/div
MAX1937 toc17
SHUTDOWN WAVEFORM
WITH NO LOAD
INDUCTOR CURRENT:
10A/div
40μs/div
MAX1937 toc14
LOAD TRANSIENT
1A TO 40A TO 1A
TRANSIENT CONTROL
SIGNAL:
C6
= 47pF
R2
= 91.1kΩ
INDUCTOR CURRENTS:
10A/div
OUTPUT VOLTAGE:
50mV/div
ENABLE SIGNAL
OUTPUT VOLTAGE:
0.5V/div
POK SIGNAL
1ms/div
MAX1937 toc15
SOFT-START WAVEFORMS
WITH NO LOAD
INDUCTOR CURRENT:
10A/div
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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