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MAX744ACWE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
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
02 6810
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 = 100µH
C4 = 150µF
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
0 200 600 800 100
0
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 (µA)
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
616
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
616
600
400
200
(NOTES 3, 6)
MAX738A
MAX730A
MAX744A
MAX730A/MAX738A/MAX744A
5V, Step-Down,
Current-Mode PWM DC-DC Converters
_______________________________________________________________________________________
5
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 3, T
A
= +25°C, unless otherwise noted.)
46810 14
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
OSCILLATOR FREQUENCY vs.
SUPPLY VOLTAGE
12 16
MAX744A
MAX738A
MAX730A
(NOTE 3)
220
170
160
150
180
190
200
210
210
190
180
-60 20 40 80 120
TEMPERATURE (°C)
OSCILLATOR FREQUENCY (kHz)
MAX744A
OSCILLATOR FREQUENCY 
vs. TEMPERATURE
200
170
-40 -20 0 60 100 140 160
V+ = 6.0V
V+ = 16.0V
V+ = 9.0V
V+ = 12.0V
(NOTE 4)
200
180
170
160
-60 20 40 80 120
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
MAX738A
OSCILLATOR FREQUENCY
vs. TEMPERATURE
190
140
-40 -20 0 60 100 140 160
150
130
120
V+ = 6.0V
V+ = 16.0V
V+ = 12.0V
V+ = 9.0V
(NOTE 4)
-60 20 40 80 120
TEMPERATURE (°C)
OSCILLATOR FREQUENCY (kHz)
MAX730A
OSCILLATOR FREQUENCY 
vs. TEMPERATURE
-40 -20 0 60 100 140 160
240
200
180
160
220
0
140
V+ = 9.0V
V+ = 7.0V
(NOTE 4)
V+ = 5.5V
V+ = 11.0V
Note 3: Commercial temperature range external component values in Table 3.
Note 4: Wide temperature range external component values in Table 3.
Note 5: Standby and shutdown current includes all external component leakage currents. Capacitor leakage currents dominate at T
A
> +85°C,
Sanyo OS-CON capacitors were used.
Note 6: Operation beyond the specifications listed in the electrical characteristics may exceed the power dissipation ratings of the device.
MAX730A/MAX738A/MAX744A
5V, Step-Down,
Current-Mode PWM DC-DC Converters
6 _______________________________________________________________________________________
MAX738A/MAX744A
SWITCHING WAVEFORMS,
CONTINUOUS CONDITION
2µs/div
A: SWITCH VOLTAGE (LX PIN), 5V/div, 0V TO +12V
B: INDUCTOR CURRENT, 200mA/div
C: OUTPUT VOLTAGE RIPPLE, 50mV/div, AC-COUPLED
C
OUT
= 390µF,
V+ = 12V, I
OUT
= 150µA,
MAX738A/MAX744A
SWITCHING WAVEFORMS,
DISCONTINUOUS CONDITION
2µs/div
A: SWITCH VOLTAGE (LX PIN), 5V/div, 0V TO +12V
B: INDUCTOR CURRENT, 200mA/div
C: OUTPUT VOLTAGE RIPPLE, 50mV/div, AC-COUPLED
C
OUT
= 390µF,
V+ = 12V, I
OUT
= 150µA
12V
0V
200mA
0mA
A
B
C
0V
200mA
0mA
A
B
C
MAX730A LINE-TRANSIENT RESPONSE
100ms/div
A: V
OUT
, 50mV/div, DC-COUPLED
B: V+, 5V/div, 6.0V TO 11.0V
I
OUT
= 300mA
MAX738A/MAX744A LINE-TRANSIENT RESPONSE
100ms/div
A: V
OUT
, 50mV/div, DC-COUPLED
B: V+, 5V/div, 10.2V TO 16.0V
I
OUT
= 750mA
11V
6V
0V
A
B
16V
10.2V
A
B
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 3, T
A
= +25°C, unless otherwise noted.)
12V
0V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX744ACWE+

Mfr. #:
Buy MAX744ACWE+
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 5V Step-Down DC/DC Converter
Lifecycle:
New from this manufacturer.
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