Typical operating characteristics – Rainbow Electronics MAX1745 User Manual
Page 5
MAX1744/MAX1745
High-Voltage, Step-Down DC-DC
Controller in µMAX
_______________________________________________________________________________________
5
100
0
0.0001
0.001
0.01
0.1
1
10
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +3.3V)
20
MAX1744/5toc01
LOAD CURRENT (A)
EFFICIENCY (%)
40
60
80
A: V
IN
= +5.5V
B: V
IN
= +12.0V
C: V
IN
= +24.0V
D: V
IN
= +36.0V
C
D
B
A
100
0
0.0001
0.001
0.01
0.1
1
10
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +5.0V)
20
MAX1744/5toc02
LOAD CURRENT (A)
EFFICIENCY
(%)
40
60
80
A: V
IN
= +7.2V
B: V
IN
= +12.0V
C: V
IN
= +24.0V
D: V
IN
= +36.0V
B
A
D
C
80
85
90
95
100
105
110
0
10
20
30
40
IN PIN QUIESCENT CURRENT
vs. INPUT VOLTAGE (5.5V TO 36V)
MAX1744/5toc03
INPUT VOLTAGE (V)
QUIESCENT CURRENT (
µ
A)
0
1
4
5
6
3.5
4.5
5.5
IN PIN QUIESCENT CURRENT
vs. INPUT VOLTAGE (3.5V TO 5.5V)
MAX1744/5toc04
INPUT VOLTAGE (V)
QUIESCENT CURRENT (mA)
2
3
V
OUT
= 3.3V
0
60
40
20
80
120
100
140
0
10
20
30
40
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX1744/5toc05
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
V
OUT
= 3.3V
I
OUT
= 2.0A
IN PIN QUIESCENT CURRENT
vs. TEMPERATURE
MAX1744/5toc06
TEMPERATURE (
°C)
QUIESCENT CURRENT (
µ
A)
100
75
25
50
0
-25
86
87
88
89
90
91
92
93
94
95
85
-50
125
0
40
20
60
100
80
120
0
1000
2000
3000
4000
5000
EXT RISE AND FALL TIMES
vs. CAPACITANCE
MAX1744/5toc07
CAPACITANCE (pF)
t
RISE
AND t
FALL
(ns)
V
IN
= +5V
t
FALL
t
RISE
EXT RISE AND FALL TIMES
vs. TEMPERATURE
MAX1744/5toc08
TEMPERATURE (
°C)
t
RISE
AND t
FALL
(ns)
100
75
25
50
0
-25
5
10
15
20
25
30
35
40
45
50
0
-50
125
t
RISE
t
FALL
V
IN
= +5V
C
L
= 1000pF
CURRENT-SENSE TRIP LEVEL
vs. TEMPERATURE
MAX1744/5toc09
TEMPERATURE (
°C)
CURRENT-SENSE TRIP LEVEL (mV)
100
75
50
25
0
-25
90
95
100
105
110
115
85
-50
125
Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise specified.)