5V/3.3V/3V/Adjustable-Output, 1A,

Step-Down, PWM, Switch-Mode DC-DC Regulators

2

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Input Voltage .................................................. 40V

Switch Voltage with Respect to Input Voltage................ 50V

Switch Voltage with Respect to GND

FB/SENSE Voltage ................................... -0.3V, +10V

Operating Temperature Range..................... 0°C to +70°C

Junction Temperature Range ..................... 0°C to +125°C

Storage Temperature Range ................... -65°C to +160°C

Lead Temperature (soldering, 10sec).................... +300°C

ELECTRICAL CHARACTERISTICS

Note 1: Do not exceed switch-to-input voltage limitation.

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

Error-Amplifier Source Current

(MAX831/832/833)

MIN

TYP

MAX

UNITS

100

140

225

Supply Current (Note 3)

mA

µA

Error-Amplifier Sink Current

(MAX831/832/833)

1.2

1.7

2.2

Input Supply Voltage Range

830

V

0.6

1.0

1.7

mA

150

Switch-Off Leakage

250

µA

811

Minimum Supply Voltage (Note 5)

Normal mode

V

Startup mode

3.5

4.8

7.3

8.0

140

500

µA

1.2

Maximum Duty Cycle

Switch-Current Limit (Note 6)

85

90

%

0.8

A

Switching-Frequency Line Regulation

8V

0.03

0.10

%/V

Error-Amplifier Transconductance

Error-Amplifier Voltage Gain

1V

2000

V/V

3000

5000

9000

µmho

Switch-On Voltage (Note 2)

1.1

V

1.4

90

100

110

Switching Frequency

85

120

20

kHz