Datasheet

Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
4 _______________________________________________________________________________________
MAX1954
EFFICIENCY vs. LOAD CURRENT
MAX1953 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
1
50
60
70
80
90
100
40
0.1 10
V
OUT
= 2.5V
V
OUT
= 1.7V
V
IN
= 5V
CIRCUIT OF FIGURE 2
MAX1953
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX1953 toc05
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
2.52.01.51.00.5
2.45
2.50
2.55
2.60
2.40
03.0
V
IN
= 5V
V
IN
= 3.3V
CIRCUIT OF FIGURE 1
MAX1954
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX1953 toc06
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
54321
2.40
2.45
2.50
2.55
2.60
2.35
06
V
HSD
= V
IN
= 5V
CIRCUIT OF FIGURE 2
MAX1953
EFFICIENCY vs. LOAD CURRENT
MAX1953 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
1
55
60
65
70
75
80
85
90
95
100
50
0.1 10
V
IN
= 3.3V
V
IN
= 5V
V
OUT
= 2.5V
CIRCUIT OF FIGURE 1
MAX1957
EFFICIENCY vs. LOAD CURRENT
MAX1953 toc03
LOAD CURRENT (A)
EFFICIENCY (%)
1
50
60
70
80
90
100
40
0.1 10
V
OUT
= 1.25V
V
IN
= 5V
CIRCUIT OF FIGURE 3
MAX1954
EFFICIENCY vs. LOAD CURRENT
MAX1953 toc04
LOAD CURRENT (A)
EFFICIENCY (%)
2015105
55
60
65
70
75
80
85
90
95
100
50
025
V
OUT
= 1.8V
V
IN
= 12V
CIRCUIT OF FIGURE 4
MAX1954
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX1953 toc07
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
54321
1.60
1.65
1.70
1.75
1.80
1.55
06
V
HSD
= V
IN
= 5V
CIRCUIT OF FIGURE 2