5V, Step-Down,
Current-Mode PWM DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 3, V+ = 9V for the MAX730A, V+ = 12V for the MAX738A/MAX744A, I
LOAD
= 0mA, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
PARAMETER
Load Regulation
Efficiency
CONDITIONS
I
LOAD
= 0mA to 300mA
I
LOAD
= 0mA to 750mA
V+ = 9.0V, I
LOAD
= 300mA
V+ = 12V, I
LOAD
= 750mA
1.7
V+ = 6.0V
to 9.0V
Supply Current
(includes switch
current)
V+ = 9.0V
to 12.0V
V+ = 12.0V
to 16.0V
Standby Current
Shutdown Input
Threshold
Shutdown Input
Leakage Current
Short-Circuit Current
Undervoltage
Lockout
LX On Resistance
LX Leakage Current
Reference Voltage
Reference Drift
130
Oscillator Frequency
Compensation Pin
Impedance
V+ = 6.0V
to 16.0V
MAX744AC/AE
MAX744AM
7500
7500
V+ rising
V+ falling
I
LX
= 500mA
V+ = 12V, LX = 0V
V+ = 12V, T
A
= +25°C
0.5
1.0
1.15 1.23
50
170
210
130
1.30
0.5
1.0
1.15 1.23
50
160
190
159.0 185.0 212.5
159.0
7500
216.5
Ω
kHz
1.30
1.5
4.7
5.2
MAX744AC/AE
MAX744AM
MAX744AC/AE
MAX744AM
MAX744AC
MAX744AE
MAX744AM
SHDN
= 0V (Note 1)
V
IH
V
IL
2.0
0.25
1.0
1.5
5.7
6.0
5.0
0.5
1.0
1.15 1.23
50
1.30
6.0
100.0
2.0
0.25
1.0
1.5
5.7
6.0
5.7
6.0
100.0
2.0
0.25
1.0
6.0
3.0
92
MAX730A
MIN TYP MAX
0.0005
0.0005
90
87
1.7
3.0
0.0005
90
87
1.7
1.2
3.0
2.5
3.0
3.0
3.5
4.0
4.3
4.5
100.0
µA
V
µA
A
V
Ω
µA
V
ppm/°C
mA
MAX738A
MIN TYP MAX
MAX744A
MIN TYP MAX
UNITS
%/mA
%
MAX730A/MAX738A/MAX744A
Note 1:
The standby current typically settles to 25µA (over temperature) within 2 seconds; however, to decrease test time, the part
is guaranteed at a 100µA maximum value.
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
