MAX1544 Datasheet, PDF (10/42 Pages) Maxim Integrated Products – Dual-Phase, Quick-PWM Controller for AMD Hammer CPU Core Power Supplies

Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V_IN = 12V, V_CC = V_DD = 5V, SHDN = SKIP = V_CC, D0–D4 set for 1.5V (SUS = GND), S0–S1 set for 1V
(SUS = V_CC), OFS = GND, T_A = +25°C, unless otherwise specified.)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (PULSE SKIPPING)
3.0
SKIP = REF
2.5
2.0
1.5
I_CC + I_DD
1.0
0.5
0
0
I_IN
5 10 15 20 25 30
INPUT VOLTAGE (V)
150
100
50
0
-50
-100
-150
0
OUTPUT OFFSET VOLTAGE
vs. OFS VOLTAGE
UNDEFINED
REGION
0.5
1.0
1.5
2.0
OFS VOLTAGE (V)
REFERENCE VOLTAGE
DISTRIBUTION
50
SAMPLE SIZE = 100
40
30
20
10
0
1.990
1.995 2.000 2.005
REFERENCE VOLTAGE (V)
2.010
CURRENT-BALANCE OFFSET
VOLTAGE DISTRIBUTION
50
SAMPLE SIZE = 100
40
30
20
10
0
-2.50
-1.25
0
1.25
2.50
OFFSET VOLTAGE (mV)
CURRENT-LIMIT THRESHOLD
DISTRIBUTION
50
V_ILIM = 0.20V
SAMPLE SIZE = 100
40
30
20
10
0
9.0
9.5
10.0
10.5
11.0
CURRENT LIMIT (mV)
VOLTAGE-POSITIONING AMPLIFIER
GAIN AND PHASE vs. FREQUENCY
60
180 ^{MAX1544 toc15}
50
144
40
108
30
72
GAIN
20
36
10
0
0
-36
-10
-72
-20
PHASE
-108
-30
-144
-40
0.1
1
10
100
1k
FREQUENCY (Hz)
-180
10k
VPS AMPLIFIER OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
180
INDUCTOR CURRENT DIFFERENCE
vs. LOAD CURRENT
1.0
160
140
0.8
SKIP = REF
120
0.6
100
80
60
40
VPS AMPLIFIER
20
DISABLED
0
0
1
2
3
4
5
COMMON-MODE VOLTAGE (V)
0.4
SKIP = V_CC
0.2
0
0
R_SENSE = 1mΩ
10
20 30
40
50
LOAD CURRENT (A)
10 ______________________________________________________________________________________