Two-Phase Desktop CPU Core Supply Controllers
with Controlled VID Change
Typical Operating Characteristics
(V
IN
= 12V, V
OUT
= 1.45V, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
AT 1.45V OUTPUT
MAX1937 toc01
MAX1937/MAX1938/MAX1939
EFFICIENCY vs. LOAD CURRENT
AT 1.85V OUTPUT
90
MAX1937 toc02
FREQUENCY vs. LOAD CURRENT
MAX1937 toc03
90
350
300
FREQUENCY (kHz)
250
200
150
100
80
EFFICIENCY (%)
V
IN
= 12V
70
EFFICIENCY (%)
V
IN
= 8V
V
IN
= 14V
80
V
IN
= 12V
V
IN
= 14V
70
V
IN
= 8V
60
60
V
OUT
= 1.45V
50
1
10
LOAD CURRENT (A)
100
V
OUT
= 1.85V
50
1
10
LOAD CURRENT (A)
100
50
0
0
V
IN
= 12V
V
OUT
= 1.45V
10
20
30
40
50
60
LOAD CURRENT (A)
FREQUENCY vs. INPUT VOLTAGE
MAX1937 toc04
FREQUENCY vs. TEMPERATURE
255
250
FREQUENCY (kHz)
245
240
235
230
V
IN
= 12V
V
OUT
= 1.45V
I
LOAD
= 10A
-40
-20
0
20
40
60
80
100
MAX1937 toc05
325
300
FREQUENCY (kHz)
275
250
225
200
175
150
8
9
10
11
12
13
I
LOAD
= 1A
I
LOAD
= 46A
260
V
OUT
= 1.45V
14
225
220
INPUT VOLTAGE (V)
TEMPERATURE (°C)
V
CC
INPUT CURRENT
vs. INPUT VOLTAGE
MAX1937 toc06
V
DD
CURRENT vs. V
DD
VOLTAGE
MAX1937 toc07
25
1.80
1.75
V
DD
CURRENT (mA)
1.70
1.65
1.60
1.55
V
CC
INPUT CURRENT (µA)
20
15
10
5
V
OUT
= 1.45V
0
8
9
10
11
12
13
14
INPUT VOLTAGE (V)
1.50
4.5
4.7
4.9
5.1
5.3
5.5
V
DD
VOLTAGE (V)
_______________________________________________________________________________________
7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
