Typical operating characteristics – Rainbow Electronics MAX1717 User Manual
Page 6
MAX1717
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
6
_______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, components of Table 1, V+ = +12V, V
DD
= V
CC
= SKP/SDN = +5V, V
OUT
= 1.6V, T
A
= +25°C, unless otherwise noted.)
50
0.01
10
1
0.1
EFFICIENCY vs. LOAD CURRENT
300kHz STANDARD APPLICATION,
CIRCUIT 1
100
70
60
90
80
MAX1717 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
SKIP MODE, V+ = 7V
SKIP MODE, V+ = 12V
SKIP MODE,
V+ = 20V
PWM MODE,
V+ = 7V
PWM MODE, V+ = 12V
PWM MODE, V+ = 20V
50
0.01
10
1
0.1
EFFICIENCY vs. LOAD CURRENT
300kHz VOLTAGE POSITIONED, CIRCUIT 2
100
70
60
90
80
MAX1717 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
SKIP MODE, V+ = 7V
SKIP MODE, V+ = 12V
SKIP MODE,
V+ = 20V
PWM MODE,
V+ = 12V
PWM MODE,
V+ = 20V
PWM
MODE,
V+ = 7V
50
0.01
10
1
0.1
EFFECTIVE EFFICIENCY vs. LOAD CURRENT
300kHz VOLTAGE POSITIONED, CIRCUIT 2
100
70
60
90
80
MAX1717 toc03
NONPOSITIONED LOAD CURRENT (A)
EFFECTIVE EFFICIENCY (%)
SKIP MODE, V+ = 7V
SKIP MODE, V+ = 12V
SKIP MODE,
V+ = 20V
PWM MODE,
V+ = 7V
PWM MODE, V+ = 12V
PWM MODE, V+ = 20V
50
0.01
10
1
0.1
EFFICIENCY vs. LOAD CURRENT
550kHz VOLTAGE POSITIONED, CIRCUIT 3
100
70
60
90
80
MAX1717 toc04
LOAD CURRENT (A)
EFFICIENCY (%)
SKIP MODE, V+ = 7V
SKIP MODE, V+ = 12V
SKIP MODE,
V+ = 20V
PWM MODE,
V+ = 12V
PWM MODE,
V+ = 7V
PWM MODE, V+ = 20V
50
0.01
10
1
0.1
EFFECTIVE EFFICIENCY vs. LOAD CURRENT
550kHz VOLTAGE POSITIONED, CIRCUIT 3
100
70
60
90
80
MAX1717 toc05
NONPOSITIONED LOAD CURRENT (A)
EFFECTIVE EFFICIENCY (%)
SKIP MODE, V+ = 7V
SKIP MODE, V+ = 12V
SKIP MODE,
V+ = 20V
PWM MODE,
V+ = 12V
PWM MODE,
V+ = 7V
PWM MODE, V+ = 20V
50
0.01
10
1
0.1
EFFICIENCY vs. LOAD CURRENT
1000kHz, +5V, CIRCUIT 4
100
70
60
90
80
MAX1717 toc06
LOAD CURRENT (A)
EFFICIENCY (%)
SKIP MODE
PWM MODE
50
0.01
10
1
0.1
EFFECTIVE EFFICIENCY vs. LOAD CURRENT
1000kHz, +5V, CIRCUIT 4
100
70
60
90
80
MAX1717 toc07
NONPOSITIONED LOAD CURRENT (A)
EFFECTIVE EFFICIENCY (%)
SKIP MODE
PWM MODE
50
0.01
10
1
0.1
EFFICIENCY vs. LOAD CURRENT
1000kHz VOLTAGE POSITIONED,
CIRCUIT 5
100
70
60
90
80
MAX1717 toc08
LOAD CURRENT (A)
EFFICIENCY (%)
SKIP MODE, V+ = 7V
SKIP MODE, V+ = 12V
SKIP MODE,
V+ = 20V
PWM MODE,
V+ = 20V
PWM MODE,
V+ = 12V
PWM MODE,
V+ = 7V
50
0.01
10
1
0.1
EFFECTIVE EFFICIENCY vs. LOAD CURRENT
1000kHz VOLTAGE POSITIONED,
CIRCUIT 5
100
70
60
90
80
MAX1717 toc09
NONPOSITIONED LOAD CURRENT (A)
EFFECTIVE EFFICIENCY (%)
SKIP MODE, V+ = 7V
SKIP MODE, V+ = 12V
SKIP MODE,
V+ = 20V
PWM MODE,
V+ = 20V
PWM MODE,
V+ = 12V
PWM MODE,
V+ = 7V