User Manual

MAX1519/MAX1545
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
_______________________________________________________________________________________ 9
OUTPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 1.50V)
MAX1519 toc01
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
40 503010 20
1.40
1.42
1.44
1.46
1.48
1.50
1.52
1.38
060
100
90
80
70
60
50
0.1 1 10 100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.50V)
MAX1519 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
V
IN
= 20V
V
IN
= 12V
V
IN
= 8V
SKIP = REF
SKIP = V
CC
OUTPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 1.00V)
MAX1519 toc03
LOAD CURRENT
(
A
)
OUTPUT VOLTAGE (V)
5010 3020 40
0.92
0.94
0.96
0.98
1.00
1.02
0.90
060
Typical Operating Characteristics
(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.)
100
90
80
50
0.1 10 100
70
60
LOAD CURRENT (A)
EFFICIENCY (%)
1
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.00V)
MAX1519 toc04
V
IN
= 20V
V
IN
= 12V
V
IN
= 8V
SKIP = REF
SKIP = V
CC
OUTPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 0.80V)
MAX1519 toc05
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
30
SUS = V
CC
10 20
0.74
0.76
0.78
0.80
0.82
0.72
040
100
90
80
50
0.1 10 100
70
60
LOAD CURRENT (A)
EFFICIENCY (%)
1
DUAL-PHASE EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 0.80V)
MAX1519 toc06
V
IN
= 20V
V
IN
= 8V
V
IN
= 12V
SKIP = REF
100
90
80
50
0.1 10 100
70
60
LOAD CURRENT (A)
EFFICIENCY (%)
1
SINGLE-PHASE EFFICIENCY
vs. LOAD CURRENT
(V
OUT
= 0.80V)
MAX1519 toc07
V
IN
= 20V
V
IN
= 8V
V
IN
= 12V
SKIP = GND
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX1532toc08
LOAD CURRENT (A)
SWITCHING FREQUENCY (kHz)
3010 20
100
200
300
400
0
040
V
OUT
= 1V (NO LOAD)
SKIP MODE (SKIP = REF)
FORCED-PWM (SKIP = V
CC
)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (FORCED-PWM MODE)
MAX1519 toc09
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
20 255 1510
30
60
90
120
150
0
030
I
IN
SKIP = V
CC
I
CC
+ I
DD