June 2005

3

M9999-062105

MIC4574

Micrel, Inc.

V

Parameter

Condition

Min

Typ

Max

Units

MIC4574 [Adjustable]

Feedback Voltage

1.217

1.230

1.243

V

Feedback Voltage

1.193

1.230

1.267

V

1.180

1.280

V

Efficiency

I

77

%

Feedback Bias Current

50

100

nA

500

nA

MIC4574-3.3

Output Voltage

3.234

3.3

3.366

V

Output Voltage

3.168

3.3

3.432

V

3.135

3.465

V

Efficiency

72

%

MIC4574-5.0

Output Voltage

4.900

5.0

5.100

V

Output Voltage

4.800

5.0

5.200

V

4.750

5.250

V

Efficiency

77

%

MIC4574 / -3.3 / -5.0

Oscillator Frequency

180

200

220

kHz

Saturation Voltage

I

1

1.3

V

1.5

V

Maximum Duty Cycle (On)

FB connected to 0V

90

95

%

Current Limit

Peak Current, t

0.7

1.0

1.6

A

0.65

1.8

A

Output Leakage Current

V

Output = 0V

0

2

mA

Output = –1V

7.5

35

mA

Quiescent Current

510

mA

Standby Quiescent Current

SHDN = 5V (regulator off)

50

200

µA

SHDN Input Logic Level

V

2.2

1.4

V

2.4

V

V

1.2

1.0

V

0.8

V

SHDN Input Current

SHDN = 5V (regulator off)

4

30

µA

SHDN = 0V (regulator on)

–10

0.01

10

µA

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.

Devices are ESD sensitive. Handling precautions recommended.

Note 4.

Specification for packaged product only.

Note 5.

The MIC4574 is not guaranteed to survive a short circuit to ground for input voltage above 24V.

Supply Voltage (V

Shutdown (V

Output Switch (V

Junction Temperature (T

Storage Temperature ............................... –65°C to +150°C

ESD Rating, Note 3

Supply Voltage (V

Package Thermal Resistance