Rainbow Electronics MAX744A - Manual (Page 3)

MAX730A/MAX738A/MAX744A
5V, Step-Down,
Current-Mode PWM DC-DC Converters
_______________________________________________________________________________________ 3
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.
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
I LOAD = 0mA to 300mA
MAX730A
MIN TYP MAX
Supply Current
(includes switch
current)
I LOAD = 0mA to 750mA
UNITS
V+ = 9.0V, I LOAD = 300mA
MAX738A
MIN TYP MAX
4.3
mA
MAX744AE
I LX = 500mA
6.0 100.0 6.0 100.0 6.0 100.0 µA Standby Current
V IH
0.0005
LX On Resistance
2.0 2.0 2.0
MAX744AC/AE
0.5
V IL
MAX744A
MIN TYP MAX
0.25 0.25 0.25
V
0.5
0.0005
Shutdown Input
Threshold
%/mA
Shutdown Input
Leakage Current
V+ = 12V, I LOAD = 750mA
Load Regulation
0.0005
SHDN = 0V (Note 1)
0.5
1.7 3.0 1.7 3.0 1.7 3.0
159.0 185.0 212.5
Ω
MAX744AC/AE 1.2 2.5
V+ = 12V, LX = 0V
MAX744AM
1.0
3.0
1.0 1.0
V+ = 6.0V
to 9.0V
MAX744AC/AE 3.0
1.0 µA
Reference Drift
1.0 1.0
MAX744AM
µA
3.5
1.5
MAX744AM
V+ = 9.0V
to 12.0V
MAX744AC 4.0
50 50
LX Leakage Current
1.5
87
1.5
CONDITIONS
A Short-Circuit Current
V+ rising
159.0 216.5
5.7 6.0 5.7 6.0 4.7 5.2
V+ falling 5.0 5.7
V
kHz
Undervoltage
Lockout
90
87
90
% Efficiency
92
V+ = 6.0V
to 16.0V
V+ = 12V, T A = +25°C Reference Voltage 1.15 1.23 1.30 1.15 1.23 1.30 1.15 1.23 1.30 V
50
130 160 190 130 170 210
ppm/°C
Oscillator Frequency
7500 7500 7500
Ω
Compensation Pin
Impedance
4.5
V+ = 12.0V
to 16.0V
MAX744AM