Rainbow Electronics MAX744A User Manual
Page 2
MAX730A/MAX738A/MAX744A
5V, Step-Down,
Current-Mode PWM DC-DC Converters
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PARAMETER
MAX730A
MIN
TYP
MAX
UNITS
4.75
5.00
5.25
CONDITIONS
Pin Voltages
V+ (MAX730A) ......................................................+12V, -0.3V
V+ (MAX738A/MAX744A) .....................................+18V, -0.3V
LX (MAX730A) .................................(V+ - 12V) to (V+ + 0.3V)
LX (MAX738A/MAX744A) ................(V+ - 21V) to (V+ + 0.3V)
OUT .................................................................................±25V
SS, CC,
SHDN .........................................-0.3V to (V+ + 0.3V)
Peak Switch Current (I
LX
) ........................................................2A
Reference Current (I
REF
) ...................................................2.5mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)...727mW
8-Pin SO (derate 5.88mW/°C above +70°C) ...............471mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C) .......640mW
Operating Temperature Ranges:
MAX7_ _AC_ _....................................................0°C to +70°C
MAX7_ _AE_ _ .................................................-40°C to +85°C
MAX7_ _AMJA ..............................................-55°C to +125°C
Junction Temperatures:
MAX7_ _AC_ _/AE_ _...................................................+150°C
MAX7_ _AMJA.............................................................+175°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
0mA < I
LOAD
< 450mA,
MAX730AC
0mA < I
LOAD
< 450mA,
MAX730AE
0mA < I
LOAD
< 300mA,
MAX730AM
0mA < I
LOAD
< 450mA,
MAX738AC/AE
0mA < I
LOAD
< 350mA,
MAX738AM
0mA < I
LOAD
< 500mA,
MAX744AC/AE
0mA < I
LOAD
< 375mA,
MAX744AM
MAX738A
MIN
TYP
MAX
4.75
5.00
5.25
4.75
5.00
5.25
MAX744A
MIN
TYP
MAX
4.75
5.00
5.25
4.75
5.00
5.25
Output Voltage
V
V+ = 9.0V
to 16.0V
6.0
16.0
6.0
16.0
5.2
11.0
V
V+ = 5.2V to 11.0V
0.15
V+ = 6.0V to 16.0V
0.15
0.15
%/V
Line Regulation
V+ = 6.0V
to 16.0V
V+ = 6.0V
to 11.0V
V+ = 10.2V to 16.0V,
0mA < I
LOAD
< 750mA
0mA < I
LOAD
< 750mA,
MAX744AC/AE
0mA < I
LOAD
< 600mA,
MAX744AM
Input Voltage
Range