Micrel

MIC2172/3172

April 2006

4

M9999-041806

(408) 955-1690

Absolute Maximum Ratings MIC2172

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

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

Sync Current............................................................... 50mA

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

±15V

Operating Temperature Range

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

°C

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

°C

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

°C to +150°C

Thermal Resistance

θ

θ

°C/W

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

°C to +150°C

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

°C

Electrical Characteristics MIC2172

Parameter

Condition

Min

Typ

Max

Units

Reference Section

Pin 2 tied to pin 3

1.220

1.214

1.240

1.264

1.274

V

V

Feedback Voltage Line

Regulation

3V

0.03

%/V

Feedback Bias Current

310

750

1100

nA

nA

Error Amplifier Section

Transconductance

(

3.0

2.4

3.9

6.0

7.0

µA/mV

µA/mV

Voltage Gain

(

0.9V

500

800

2000

V/V

Output Current

125

100

175

350

400

µA

µA

Output Swing

1.8

0.25

2.1

0.35

2.3

0.52

V

V

Compensation Pin

Threshold

Duty Cycle = 0

0.8

0.6

0.9

1.08

1.25

V

V

Output Switch Section

ON Resistance

0.76

1

1.1

Ω

Ω

Current Limit

Duty Cycle = 80%, Note 2

1.25

1.25

1

3

3.5

2.5

A

A

A

Breakdown Voltage (BV)

3V

65

75

V

Notes:

1. Exceeding the absolute maximum rating may damage the device.

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

3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.

4. Specification for packaged product only.