MAX727/MAX728/MAX729
5V/3.3V/3V 2A Step-Down, PWM,
Switch-Mode DC-DC Regulators
2 _______________________________________________________________________________________
Input Voltage..................................................45V
Switch Voltage with Respect to Input Voltage................50V
Switch Voltage with Respect to GND Pin (V
SW
negative)
(Note 1) .....................................................35V
SENSE Pin Voltage...................................-0.3V, +10V
Operating Temperature Ranges
MAX72_CCK .....................................0°C to +70°C
MAX72_ECK....................................-40°C to +85°C
Junction Temperature Ranges:
MAX72_CCK ....................................0°C to +125°C
MAX72_ECK ..................................-40°C to +125°C
Storage Temperature Range ...................-65°C to +160°C
Lead Temperature (soldering, 10sec)....................+300°C
ELECTRICAL CHARACTERISTICS
(V
IN
= 25V, T
j
= 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.
ABSOLUTE MAXIMUM RATINGS
mA
3.5 4.8
Start-Up Mode (Note 4)
V
7.3 8.0Normal Mode
Minimum Supply Voltage
8.5 11V
IN
≤ 40V, V
SENSE
= 5.5V
T
j
= +25°C
µA
250
T
j
= +25°C
T
j
= +25°C
V
IN
= 40V, V
SW
= 0V
Switch-Off Leakage
T
j
= +25°C
T
j
= +25°C
mA
T
j
≤ +125°C
150
0.6 1.0 1.7V
SENSE
= V
OUT
+ 10%
V
IN
= 25V, V
SW
= 0V
Error-Amplifier Sink Current
µA
T
j
= +25°C
100 140 225V
SENSE
= V
OUT
- 10%Error-Amplifier Source Current
µmho
1.7
3000 5000 9000
I
SW
= 2A
Error-Amplifier Transconductance
V/V
V
1.2
20001V ≤ V
C
≤ 4V
I
SW
= 0.5A
Error-Amplifier Voltage Gain
Switch-On Voltage (Note 2)
%/V0.03 0.10
kHzSwitching Frequency
20V
OUT
= V
SENSE
= 0V (Note 5)
85 120
T
j
= +25°C
90 100 110
T
j
= +25°C
%85 90Maximum Duty Cycle
8V ≤ V
IN
≤ 40VSwitching Frequency Line Regulation
UNITSMIN TYP MAX
3.5 5.0
CONDITIONSPARAMETER
Supply Current (Note 3)
2.0 2.6 3.2 ASwitch-Current Limit (Note 5)
V8.0 40.0Input Supply Voltage Range
T
j
≥ 0°C
T
j
< 0°C
(29 paginas)
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