Typical operating characteristics – Rainbow Electronics MAX1791 User Manual
Page 6
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX, Step-Down
Controllers for Notebooks
6
_______________________________________________________________________________________
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
100
0
0.1
1
10
100
1000
10,000
MAX1762
EFFICIENCY vs. LOAD (2.5V)
20
MAX1762/91 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
10
30
50
70
90
V
VP
= 5V
V
VP
= 12V
V
VP
= 7V
V
VP
= 18V
100
0
0.1
1
10
100
1000
10,000
MAX1791
EFFICIENCY vs. LOAD (3.3V)
20
MAX1762/91 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
10
30
50
70
90
V
VP
= 18V
V
VP
= 12V
V
VP
= 7V
V
VP
= 5V
100
0
0.1
1
10
100
1000
10,000
MAX1791
EFFICIENCY vs. LOAD (3.0V)
20
MAX1762/91 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
10
30
50
70
90
V
VP
= 7V
V
VP
= 18V
V
VP
= 12V
V
VP
= 5V
-0.6
-0.4
-0.5
-0.2
-0.3
0
-0.1
0.1
0
10
5
15
20
25
VL VOLTAGE ERROR vs. OUTPUT CURRENT
MAX1762/91 toc08
VL CURRENT (mA)
VL VOLTAGE ERROR (%)
V
VP
= 12V
V
OUT
= 2.5V
100
0
0.1
1
10
100
1000
10,000
MAX1791
EFFICIENCY vs. LOAD (5V)
20
MAX1762/91 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
10
30
50
70
90
V
VP
= 7V
V
VP
= 18V
V
VP
= 12V
250
275
325
300
350
375
FREQUENCY vs. SUPPLY VOLTAGE
MAX1762/91 toc07
SUPPLY VOLTAGE (V)
FREQUENCY (kHz)
5
11
8
14
17
V
OUT
= 3.3V
V
OUT
= 5.0V
V
OUT
= 2.5V
V
OUT
= 1.8V
LOAD = 1A
100
0
0.1
1
10
100
1000
10,000
MAX1762
EFFICIENCY vs. LOAD (1.8V)
20
MAX1762/91 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
10
30
50
70
90
V
VP
= 18V
V
VP
= 12V
V
VP
= 5V
V
VP
= 7V
100
0
0.1
1
10
100
1000
10,000
MAX1762
EFFICIENCY vs. LOAD (1V)
20
MAX1762/91 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
10
30
50
70
90
V
VP
= 7V
V
VP
= 12V
V
VP
= 5V
V
VP
= 18V