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

(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

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

Switch-Current Limit (Note 5)

5.5

6.5

8.5

A

90

100

110

85

120

20

Switching Frequency

kHz

0.03

0.10

%/V

Error-Amplifier Voltage Gain

1V

2000

V/V

Error-Amplifier Transconductance

3000

5000

9000

µmho

Error-Amplifier Source Current

100

140

225

µA

Error-Amplifier Sink Current

0.6

1.0

1.7

1.85

mA

Switch-On Voltage (Note 1)

2.10

V

Supply Current (Note 3)

mA

8.5

11

Minimum Supply Voltage

Normal Mode

7.3

8.0

V

3.5

4.8

5

300

Switch-Off Leakage

10

500

µA

2.30

2.50

Input Supply Voltage Range

8.0

40.0

V

Maximum Duty Cycle

85

90

%