Datasheet

MAX1761
Small, Dual, High-Efficiency
Buck Controller for Notebooks
6 _______________________________________________________________________________________
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 2.5V, SKIP MODE)
20
MAX1761 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +5V = VL
V+ = +18V
V+ = +7V
V+ = +12V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(3.3V, SKIP MODE)
20
MAX1761 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +5V = VL
V+ = +7V
V+ = +12V
V+ = +18V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(3.3V, PWM MODE)
20
MAX1761 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +5V = VL
V+ = +7V
V+ = +12V
V+ = +18V
0
100
50
200
150
300
250
350
0 800400 1200 1600 2000
FREQUENCY vs. LOAD CURRENT
MAX1761 toc08
LOAD CURRENT (mA)
FREQUENCY (kHz)
SKIP MODE
PWN MODE
V
OUT
= + 2.5V
V
OUT
= + 1.8V
V
OUT
= + 2.5V
V
OUT
= + 1.8V
-0.45
-0.35
-0.40
-0.20
-0.25
-0.30
-0.05
-0.10
-0.15
0
010155 20253035
VL VOLTAGE vs. OUTPUT CURRENT
MAX1761 toc09
VL CURRENT (mA)
VL ERROR (%)
V
OUT1
= 2.5V, I
OUT1
= 2A,
V
OUT2
= 1.8V, I
OUT2
= 2A
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(1.8V, PWM MODE)
20
MAX1761 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +5V = VL
V+ = +7V
V+ = +12V
V+ = +18V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(2.5V, SKIP MODE, 3.5A COMPONENTS)
20
MAX1761 toc07
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +5V
V+ = +7V
V+ = +12V
V+ = +18V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(2.5V, PWM MODE)
20
MAX1761 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +12V
V+ = +5V = VL
V+ = +7V
V+ = +18V
100
0
1 10 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
(1.8V, SKIP MODE)
20
MAX1761 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V+ = +18V
V+ = +12V
V+ = +7V
V+ = +5V = VL