MIC5281 datasheet(4/21 Pages) MICREL

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Micrel, Inc.

MIC5281

June 2011

M9999-062411-A

Absolute Maximum Ratings

(1)

VIN to GND................................................... –0.3V to +125V

VCPSRR to GND..................................................–0.3 to +14V

VFB, VSNS, VOUT to GND ................................... –0.3V to +6V

Lead Temperature (soldering, 10s).......................... +260°C

Junction Temperature ......................... –40°C ≤ TJ ≤ +125°C

Storage Temperature .........................–65°C ≤ TA ≤ +150°C

ESD Ratings

(4)

HBM ......................................................................... 2kV

MM .........................................................................200V

Operating Ratings

(2)

VIN ................................................................. +6V to +120V

VOUT Adjust Range ..................................... +1.27V to +5.5V

Junction Temperature ......................... –40°C ≤ TJ ≤ +125°C

Power Dissipation (PD)........................... Internally Limited

(3)

Junction Thermal Resistance (

JA)

8-pin ePad MSOP..............................................64°C/W

8-pin MSOP .....................................................160°C/W

Electrical Characteristics

(5)

VIN = 12V, CIN = 1.0µF, CPSRR = 0.1µF, COUT = 10µF, VOUT = 5.0V or 3.3V, IOUT = 100µA, TA = 25°C, bold values indicate

–40

°C ≤ T

J ≤ +125°C, unless noted.

Parameter

Condition

Min.

Typ.

Max.

Units

Power Supply Input

Input Voltage Range

(6)

120

Quiescent Supply Current

IOUT = 0

µA

Output Voltage

Adjustable

1.27

5.5

3.2

3.3

3.4

Fixed 3.3V

3.13

3.3

3.47

4.85

5.0

5.15

Output Voltage

Fixed 5.0V

4.75

5.0

5.25

−3

Output Voltage Accuracy

Variation from nominal VOUT

−5

Load Regulation

IOUT = 100µA to 25mA

−0.5

0.2

+0.5

Line Regulation

(7)

VIN = 10V to 120V

−0.5

0.04

+0.5

%/V

Feedback Input (Adjustable)

1.232

1.270

1.308

FB Voltage

1.206

1.270

1.333

FB Current

VFB = 1.27V

3.2

Current Limit

VOUT = 0V

130

Ripple Rejection

Power Supply Rejection Ratio

f = 20kHz to 2MHz

>90

Notes:

Exceeding an absolute maximum rating may damage the device.

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

The maximum allowable power dissipation at any TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable power

dissipation results in excessive die temperature, and causes the regulator to enter thermal shutdown.

Devices are ESD sensitive; use proper handling precautions.

Specifications are for packaged products only.

Assure that VIN ≥ (VOUT + 3V) and VIN ≥ 6V.

Line regulation is a percentage of VOUT.

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