MIC2172/3172

Micrel

4-16

1997

Parameter

Conditions

Min

Typ

Max

Units

Oscillator Section

Frequency (f

88

100

112

kHz

85

115

kHz

Duty Cycle [

δ(max)]

80

89

95

%

Sync Coupling Capacitor

V

22

51

120

pF

Required for Frequency Lock

V

2.2

4.7

10

pF

Peak-to-Peak Voltage

C

2.2

12

30

V

Required for Frequency Lock

Input Supply Voltage Section

Minimum Operating Voltage

2.7

3.0

V

Quiescent Current (I

3V

≤ V

7

9

mA

Supply Current Increase (

∆I

∆I

9

20

mA

Bold type denotes specifications applicable to the full operating temperature range.

Note 1

Devices are ESD sensitive. Handling precautions required.

Note 2

For duty cycles (

δ) between 50% and 95%, minimum guaranteed switch current is given by I

Absolute Maximum Ratings MIC3172

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

Switch Voltage .............................................................. 65V

Enable Voltage .............................................................. 40V

Feedback Voltage (Transient, 1ms) ...........................

±15V

Operating Temperature Range

8-pin PDIP ................................................. –40 to +85

°C

8-pin SOIC ................................................ –40 to +85

°C

8-pin CerDIP ........................................... –55 to +125

°C

Junction Temperature ................................ –55

°C to 150°C

Thermal Resistance

θ

θ

θ

Storage Temperature ................................. –65

°C to 150°C

Soldering (10 sec.) .................................................... 300

°C

Parameter

Conditions

Min

Typ

Max

Units

Reference Section

Pin 2 tied to pin 3

Feedback Voltage (V

1.224

1.240

1.264

V

1.214

1.274

V

Feedback Voltage

3V

≤ V

0.07

%/V

Line Regulation

Feedback Bias Current (I

310

750

nA

1100

nA