
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.
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