MAX1981A Maxim Integrated Products, MAX1981A Datasheet - Page 10

• Manufacturer Part Number: MAX1981A
• Description: (MAX1907A / MAX1981A) Quick-PWM Master Controllers
• Manufacturer: Maxim Integrated Products

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Quick-PWM Master Controllers for Voltage-
Positioned CPU Core Power Supplies (IMVP-IV)
(Circuit of Figure 1, V+ = 12V, V
10
350
330
310
290
270
250
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
______________________________________________________________________________________
25
20
15
10
0
5
0
1.995
-40
0
vs. INPUT VOLTAGE (PULSE SKIPPING)
REFERENCE VOLTAGE DISTRIBUTION
MAX1907A/MAX1981A ONLY
DPSLP = GND
SINGLE PHASE
V
OUT
FREQUENCY vs. TEMPERATURE
-20
NO-LOAD SUPPLY CURRENT
1.997
= 1.436V
5
REFERENCE VOLTAGE (V)
0
TEMPERATURE (°C)
INPUT VOLTAGE (V)
10
1.999
20
15
40
2.001
I+
I
CC
20
60
CC
+ I
DD
2.003
20A LOAD
NO LOAD
= V
25
80
DD
2.005
100
30
= 5V, B0–B2 set to 1.276V, S0–S2 set to 0.748V.)
Typical Operating Characteristics (continued)
-200
-400
-600
600
400
200
25
24
23
22
21
20
60
50
40
30
20
10
0
0
-600
-40
0.98
OUTPUT CURRENT AT CURRENT LIMIT
vs. POS-NEG DIFFERENTIAL VOLTAGE
POS-NEG OFFSET GAIN DISTRIBUTION
POS-NEG DIFFERENTIAL VOLTAGE (mV)
-20
-400
OUTPUT OFFSET VOLTAGE
0.99
vs. TEMPERATURE
POS-NEG OFFSET GAIN
0
-200
TEMPERATURE (°C)
20
1.00
0
40
200
SINGLE PHASE
60
1.01
400
80
600
100
1.02
-10
-20
-30
-40
35
30
25
20
15
10
50
40
30
20
10
50
40
30
20
10
60
5
0
0
0
1.250
vs. INPUT VOLTAGE (FORCED-PWM MODE)
0.1
1.260V OUTPUT VOLTAGE DISTRIBUTION
0
MAX1907A/MAX1981A ONLY
VOLTAGE-POSITIONING AMPLIFIER
GAIN AND PHASE vs. FREQUENCY
NO-LOAD SUPPLY CURRENT
5
1
1.255
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
10
PHASE
FREQUENCY (kHz)
10
GAIN
1.260
15
100
I
CC
20
1.265
I+
= I
MAX1907A/81A toc18
1000
DD
25
10,000
1.270
30
-108
-144
-180
180
144
108
-36
-72
72
36
0