MAX787/MAX788/MAX789
5V/3.3V/3V 5A 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
MAX78_CCK .....................................0°C to +70°C
MAX78_ECK....................................-40°C to +85°C
Junction Temperature Ranges
MAX78_CCK ...................................0°C to +125°C
MAX78_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
PARAMETER CONDITIONS
Start-Up Mode (Note 4)
3.5 5.0
MIN TYP MAX UNITS
Switching Frequency Line Regulation 8V ≤ V
IN
≤ 40V
Switch-Current Limit (Note 5) 5.5 6.5 8.5 A
T
j
< 0°C
90 100 110
T
j
≥ 0°C
85 120
V
OUT
= V
SENSE
= 0V (Note 5) 20
Switching Frequency kHz
0.03 0.10 %/V
Error-Amplifier Voltage Gain 1V ≤ V
C
≤ 4V 2000 V/V
Error-Amplifier Transconductance 3000 5000 9000 µmho
Error-Amplifier Source Current V
SENSE
= V
OUT
- 10% 100 140 225
T
j
= +25°C
µA
Error-Amplifier Sink Current
I
SW
= 1A
V
SENSE
= V
OUT
+ 10% 0.6 1.0 1.7
1.85
T
j
≤ +125°C
mA
T
j
= +25°C
T
j
= +25°C
Switch-On Voltage (Note 1)
T
j
= +25°C
T
j
= +25°C
2.10
V
T
j
= +25°C
Supply Current (Note 3) mAV
IN
≤ 40V, V
SENSE
= 5.5V 8.5 11
Minimum Supply Voltage
Normal Mode 7.3 8.0
V
3.5 4.8
T
j
= +25°C
T
j
= +25°CV
IN
= ≤ 25V, V
SW
= 0V 5 300
Switch-Off Leakage
V
IN
= 40V, V
SW
= 0V 10 500
µA
T
j
< 0°C
T
j
≥ 0°C
I
SW
= 5A
2.30
2.50
Input Supply Voltage Range 8.0 40.0 V
Maximum Duty Cycle 85 90 %
T
j
≥ 0°C
T
j
< 0°C
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