MIC4680

Micrel

MIC4680

4

June 2000

Parameter

Condition

Min

Typ

Max

Units

MIC4680/-3.3/-5.0

Frequency Fold Back

30

50

100

kHz

Oscillator Frequency

180

200

220

kHz

Saturation Voltage

I

1.4

1.8

V

V

Short Circuit Current Limit

V

1.3

1.8

2.5

A

Standby Quiescent Current

V

1.5

µA

V

30

100

µA

Shutdown Input Logic Level

regulator off

2

1.6

V

regulator on

1.0

0.8

V

Shutdown Input Current

V

–10

–0.5

10

µA

V

–10

–1.5

10

µA

Thermal Shutdown

160

°C

Note 1.

Exceeding the absolute maximum rating may damage the device.

Note 2.

The device is not guaranteed to function outside its operating rating.

Note 3.

Absolute maximum rating is intended for voltage transients only, prolonged dc operation is not recommended.

Note 4.

V

Note 5.

Devices are ESD sensitive. Handling precautions recommended.

Note 6.

Measured on 1" square of 1 oz. copper FR4 printed circuit board connected to the device ground leads.

Note 7.

Test at T

Test Circuit

SW

68

µH

IN

FB

GND

SHDN

Device Under Test

+12V

SHUTDOWN

ENABLE

SOP-8

5–8

4

3

2

1

I

Current Limit Test Circuit

Shutdown Input Behavior

OFF

ON

GUARANTEED

OFF

TYPICAL

OFF

GUARANTEED

ON

TYPICAL

ON

0.8V

1V

0V

1.6V

2V

Shutodwn Hysteresis