MIC2172 datasheet(4/16 Pages) MICREL

4 / 16 page

MIC2172/3172

Micrel

4-16

1997

Parameter

Conditions

Min

Typ

Max

Units

Oscillator Section

Frequency (f

100

112

kHz

115

kHz

Duty Cycle [

δ(max)]

Sync Coupling Capacitor

PP = 3.0V

120

Required for Frequency Lock

PP = 40V

2.2

4.7

Peak-to-Peak Voltage

COUPLING = 12pF

2.2

Required for Frequency Lock

Input Supply Voltage Section

Minimum Operating Voltage

2.7

3.0

Quiescent Current (I

≤ V

IN ≤ 40V, VCOMP = 0.6V, ISW = 0

Supply Current Increase (

∆I

IN)

∆I

SW = 1A, VCOMP = 1.5V

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

CL = 0.833 (2-δ) for the MIC3172.

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

JA 8-pin PDIP ................................................. 130°C/W

JA 8-pin SOIC ................................................. 120°C/W

JA 8-pin CerDIP .............................................. 100°C/W

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

°C to 150°C

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

°C

Electrical Characteristics MIC3172 Note 1. Unless otherwise specified, V

IN = 5V.

Parameter

Conditions

Min

Typ

Max

Units

Reference Section

Pin 2 tied to pin 3

Feedback Voltage (V

FB)

1.224

1.240

1.264

1.214

1.274

Feedback Voltage

≤ V

IN ≤ 40V

0.07

%/V

Line Regulation

Feedback Bias Current (I

FB)

310

750

1100

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