Rainbow Electronics MAX744A - Manual (Page 4)

100
90
80
60
0 200 600 800 1000
OUTPUT CURRENT (mA)
EFFICIENCY (%)
MAX730A
EFFICIENCY vs. OUTPUT CURRENT
70
400
V+ = 5.5V
V+ = 7V
V+ = 9V
V+ = 11V
(NOTES 3, 6)
100
90
80
60
0 200 600 800 1000
OUTPUT CURRENT (mA)
EFFICIENCY (%)
MAX738A
EFFICIENCY vs. OUTPUT CURRENT
70
400
V+ = 6V
V+ = 8V
V+ = 12V
V+ = 16V
(NOTES 3, 6)
2.5
2.0
1.5
0
0 2 6 8 10
QUIESCENT SUPPLY CURRENT (mA)
MAX738A/MAX744A
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
0.5
4
1.0
12 14 16
UNDERVOLTAGE
LOCKOUT HYSTERESIS
UNDERVOLTAGE
LOCKOUT ENABLED
1000
800
600
0
0 100 300 400 500
PEAK INDUCTOR CURRENT (mA)
MAX738A/MAX744A
PEAK INDUCTOR CURRENT
vs. OUTPUT CURRENT
200
200
400
600 700 800
L1 = 100 µ H
C4 = 150 µ F
V+ = 6.6V
V+ = 8.0V TO 16.0V
MAX730A/MAX738A/MAX744A
5V, Step-Down,
Current-Mode PWM DC-DC Converters
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(Circuit of Figure 3, T
A
= +25°C, unless otherwise noted.)
100
90
80
60
0 200 600 800 1000
OUTPUT CURRENT (mA)
EFFICIENCY (%)
MAX744A
EFFICIENCY vs. OUTPUT CURRENT
70
400
V+ = 6.0V
V+ = 9.0V
V+ = 12.0V
V+ = 16.0V
(NOTE 3)
-60 0 60 80 100
STANDBY SUPPLY CURRENT (
µ
A)
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
16
10
6
2
18
14
12
8
4
0
-40 -20 20 40 120 140 160
V+ = 16V
MAX738A/MAX744A
ONLY
V+ = 9V
V+ = 6V
(NOTES 4, 5)
20
V+ = 12V
MAX738A/MAX744A
ONLY
3.0
2.5
1.5
1.0
0.5
-60 20 40 80 120
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (mA)
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
2.0
0
-40 -20 0 60 100 140 160
MAX730A, V+ = 9.0V
MAX738A, V+ = 12.0V
MAX744A, V+ = 12.0V
(NOTES 4, 5)
1400
1000
4 8 10 12 14
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
MAXIMUM OUTPUT CURRENT vs.
SUPPLY VOLTAGE
1200
800
6 16
MAX738A
MAX730A
MAX744A
(NOTES 3, 6)
1400
1000
800
4 8 10 12 14
SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
MAXIMUM OUTPUT CURRENT vs.
SUPPLY VOLTAGE, NO R1
1200
6 16
600
400
200
(NOTES 3, 6)
MAX738A
MAX730A
MAX744A