July 2001

3

MIC4684

MIC4684

Micrel

Electrical Characteristics

V

Parameter

Condition

Min

Typ

Max

Units

Feedback Voltage

(

±2%)

1.210

1.235

1.260

V

(

±3%)

1.198

1.272

V

8V

≤ V

1.186

1.235

1.284

V

1.173

1.297

V

Feedback Bias Current

50

nA

Maximum Duty Cycle

V

94

%

Output Leakage Current

V

5

500

µA

V

1.4

20

mA

Quiescent Current

V

6

12

mA

Bootstrap Drive Current

V

250

380

mA

Bootstrap Voltage

I

5.5

6.2

V

Frequency Fold Back

V

30

50

120

kHz

Oscillator Frequency

180

200

225

kHz

Saturation Voltage

I

0.59

V

Short Circuit Current Limit

V

2.2

A

Shutdown Current

V

150

µA

Enable Input Logic Level

regulator on

2

V

regulator off

0.8

V

Enable Pin Input Current

V

16

50

µA

V

–1

–0.83

mA

Thermal Shutdown @ T

J

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.

Devices are ESD sensitive. Handling precautions recommended.

Note 4.

2.5V of headroom is required between V

to 3.3V circuit on page 1.

Note 5.

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

Supply Voltage (V

Enable Voltage (V

Steady-State Output Switch Voltage (V

Feedback Voltage (V

Storage Temperature (T

ESD Rating .............................................................. Note 3

Supply Voltage (V

Ambient Temperature (T

Junction Temperature (T

Package Thermal Resistance

θ

θ