8V ≤ V
IN
≤ 40V
MAX724/MAX726
5A/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 Ground Pin (V
SW
Negative)
(Note 1) .....................................................35V
Feedback 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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch-On Voltage (Note 2)
MAX724
T
j
≥ 0°C
1.85
T
j
< 0°C
2.10
T
j
≥ 0°C
T
j
< 0°C
2.50
MAX726
1.2
1.7
Switch-Off Leakage
MAX724
T
j
= +25°C
5 300
µA
T
j
= +25°C
10 500
ABSOLUTE MAXIMUM RATINGS
I
SW
= 1A
I
SW
= 5A
I
SW
= 0.5A
I
SW
= 2A
V
IN
≤ 25V, V
SW
= 0V
V
IN
= 40V, V
SW
= 0V
V
IN
≤ 25V, V
SW
= 0V
V
IN
= 40V, V
SW
= 0V
MAX726
T
j
= +25°C
150
T
j
= +25°C
250
2.30
V
V
FB
= 2.5V, V
IN
≤ 40V 8.5 11Supply Current (Note 3) mA
85 90Maximum Duty Cycle %
T
j
= +25°C
90 100 110
T
j
= +25°C
20
Switching Frequency kHz
V
FB
= grounded through 2kΩ (Note 5)
T
j
≤ +125°C
85 120
MAX724 5.5 6.5 8.5
Switch-Current Limit (Note 5) A
MAX726 2.0 2.6 3.2
0.03 0.1Switching Frequency Line Regulation %/V
Input Supply Voltage Range 8.0 40.0 V
T
j
≥ 0°C
3.5 4.8
V
Normal Mode 7.3 8.0
Start-Up Mode (Note 4)
T
j
< 0°C
3.5 5.0
Minimum Supply Voltage
V
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