MIC2172 datasheet(5/20 Pages) MICREL

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Micrel

MIC2172/3172

April 2006

M9999-041806

(408) 955-1690

Typical Characteristics MIC2172 (cont)

Parameter

Condition

Min

Typ

Max

Units

Oscillator Section

Frequency (fO)

100

112

115

kHz

Duty Cycle [

δ(max)]

Sync Coupling Capacitor

Required for Frequency

Lock

VPP = 3.0V

VPP = 40V

2.2

4.7

120

Input Supply Voltage Section

Minimum Operating

Voltage

2.7

3.0

Quiescent Current (IQ)

≤ VIN ≤ 40V, VCOMP = 0.6V, ISW = 0

Supply Current Increase

(

∆IIN)

∆ISW = 1A, VCOMP = 1.5V

Electrical Characteristics MIC3172

Note 1, 3. Unless otherwise specified, VIN = 5V.

Parameter

Condition

Min

Typ

Max

Units

Reference Section

Pin 2 tied to pin 3

Feedback Voltage (VFB)

1.224

1.214

1.240

1.264

1.274

Feedback Voltage Line

Regulation

≤ VIN ≤ 40V

0.07

%/V

Feedback Bias Current

(IFB)

310

750

1100

Error Amplifier Section

Transconductance

(

∆ICOMP/∆VFB)

∆ICOMP = ±25µA

3.0

2.4

3.9

6.0

7.0

µA/mV

Voltage Gain

(

∆VCOMP/∆VFB)

0.9V

≤ VCOMP ≤ 1.4V

500

800

2000

V/V

Output Current

VCOMP = 1.5V

125

100

175

350

400

µA

Output Swing

High Clamp, VFB = 1V

Low Clamp, VFB = 1.5V

1.8

0.25

2.1

0.35

2.3

0.52

Compensation Pin

Threshold

Duty Cycle = 0

0.8

0.6

0.9

1.08

1.25

Output Switch Section

ON Resistance

ISW = 1A, VFB = 0.8V

0.76

1.1

Ω

Current Limit

Duty Cycle = 50%, TJ ≥ 25°C

Duty Cycle = 50%, TJ < 25°C

Duty Cycle = 80%, Note 2

1.25

3.5

2.5

Breakdown Voltage (BV)

≤ VIN ≤ 40V

ISW = 5mA

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