MIC2179_09 datasheet(5/13 Pages) MICREL

Part #	MIC2179

Description	1.5A Synchronous Buck Regulator

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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5 / 13 page

June 2009

5

M9999-063009

Micrel, Inc.

MIC2179

Typical Characteristics

175

180

185

190

195

200

205

-60 -30 0

30 60 90 120 150

TEMPERATURE (°C)

Oscillator Frequency

vs. Temperature

1.238

1.240

1.242

1.244

1.246

1.248

1.250

1.252

-60 -30 0

30 60 90 120 150

TEMPERATURE (°C)

Reference Voltage

vs. Temperature

MIC2179 [adj.]

3.280

3.285

3.290

3.295

3.300

3.305

3.310

3.315

3.320

-60 -30 0

30 60 90 120 150

TEMPERATURE (°C)

Reference Voltage

vs. Temperature

MIC2179-3.3

4.970

4.980

4.990

5.000

5.010

5.020

5.030

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

Reference Voltage

vs. Temperature

MIC2179-5.0

16.0

16.5

17.0

17.5

18.0

18.5

19.0

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

Error-Amplifier Gain

vs. Temperature

0

20

40

60

80

100

120

-60 -30 0

30 60 90 120 150

TEMPERATURE (°C)

Feedback Input Bias Current

vs. Temperature

3.5

3.7

3.9

4.1

4.3

4.5

4.7

4.9

5.1

5.3

5.5

-60 -30 0 30 60 90 120 150

TEMPERATURE (°C)

Current Limit

vs. Temperature

0

50

100

150

200

250

300

350

2

10 12 14 16 18

INPUT VOLTAGE (V)

High-Side Switch

On-Resistance

125°C

85°C

25°C

0°C

4 6 8

0

50

100

150

200

250

300

350

400

2

10 12 14 16 18

INPUT VOLTAGE (V)

Low-Side Switch

On-Resistance

125°C

85°C

25°C

0°C

4

6

8

0

2

4

6

8

10

12

2

10 12 14 16 18

INPUT VOLTAGE (V)

PWM-Mode

Supply-Current

OUTPUT

SWITCHING

4

6

8

60

65

70

75

80

85

90

95

10

100

600

OUTPUT CURRENT (mA)

5.4V

PWM

8.4V

PWM

8.4V

Skip

5.4V

Skip

Skip- and PWM-Mode

Efficiency

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