MAX640 datasheet(2/12 Pages) MAXIM

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5V/3.3V/3V/Adjustable, High-Efficiency,

Low IQ, Step-Down DC-DC Converters

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, ILOAD = 0mA, TA = TMIN to TMAX, typical values are at TA = +25°C,

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

MIN

TYP

MAX

UNITS

Dropout Voltage

0.5

Output Voltage (Note 2)

2.88

3.00

3.12

3.17

3.30

3.43

Supply Current

Supply Voltage

4.0

11.5

µA

4.80

5.00

5.20

Efficiency

CONDITIONS

MAX653

IOUT = 100mA, L = 100µH

MAX653, V+ = 4.0V to 11.5V, 0mA < IOUT < 100mA

MAX640, V+ = 4.0V to 11.5V, 0mA < IOUT < 100mA

MAX639

MAX640

SHDN = V+, no load

MAX639, V+ = 6.0V to 11.5V, 0mA < IOUT < 100mA

V+...........................................................................................12V

LX .........................................................(V+ - 12V) to (V+ + 0.3V)

LBI, LBO, VFB, SHDN, VOUT........................-0.3V to (V+ + 0.3V)

LX Output Current (Note 1) ......................................................1A

LBO Output Current ............................................................10mA

Continuous Power Dissipation (TA = +70°C)

Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW

SO (derate 5.88mW/°C above +70°C) ..........................471mW

CERDIP (derate 8.00mW/°C above +70°C) ..................640mW

Operating Temperature Ranges:

MAX639C_ _ .......................................................0°C to +70°C

MAX639E_ _ ....................................................-40°C to +85°C

MAX639MJA ..................................................-55°C to +125°C

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

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

IOUT = 100mA, L = 100µH

IOUT = 25mA, L = 470µH

IOUT = 100mA, L = 100µH

IOUT = 25mA, L = 470µH

IOUT = 100mA, L = 100µH

IOUT = 25mA, L = 470µH

Switch On-Time

V+ = 9V, VOUT = 5V

V+ = 6V, VOUT = 3V

42.5

50.0

57.5

V+ = 9V, VOUT = 3.3V

V+ = 4V, VOUT = 3.3V

µs

10.6

12.5

14.4

V+ = 9V, VOUT = 3V

V+ = 4V, VOUT = 3V

14.2

16.7

19.2

7.5

8.8

10.1

60.7

71.4

82.1

7.1

8.3

9.5

MAX653

MAX639

MAX640

Switch Off-Time

V+ = 9V, VOUT = 5V

V+ = 6V, VOUT = 3V

14.6

17.2

19.8

V+ = 9V, VOUT = 3.3V

V+ = 4V, VOUT = 3.3V

µs

9.0

11.7

13.5

V+ = 9V, VOUT = 3V

V+ = 4V, VOUT = 3V

16.6

19.5

22.4

13.3

15.6

17.9

13.3

15.6

17.9

14.6

17.2

19.8

MAX653

MAX639

MAX640

Note 1: Peak inductor current must be limited to 600mA by using an inductor of 100µH or greater.

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