MIC4682 datasheet(3/15 Pages) MICREL

3 / 15 page

Micrel, Inc.

MIC4682

June 2007

M9999-061507

Absolute Maximum Ratings

(1)

Supply Voltage (VIN)

(3) ....................................................38V

Shutdown Voltage (VSHDN)............................. –0.3V to +38V

Steady-State Output Switch Voltage (VSW) ....................–1V

Feedback Voltage (VFB) .................................................12V

Current Limit Set Voltage (VISET) ....................... 1.23V to 7V

Ambient Storage Temperature (Ts) ...........–65°C to +150°C

ESD Rating

(5).................................................................. 2kV

Operating Ratings

(2)

Supply Voltage (VIN)

(4, 7) ....................................... 4V to 34V

Junction Temperature Range (TJ)............. –40°C to +125°C

Thermal Resistance Impedance

SOIC (

JA)

(6) .......................................................63°C/W

SOIC (

JC)

(6) .......................................................20°C/W

Electrical Characteristics

VIN = 12V; IOUT = 500mA; RISET = 16.2k (1A current limit); TJ = 25°C, bold values indicate –40°C< TJ < +125°C, unless noted.

Symbol

Parameter

Condition

Min

Typ

Max

Units

VIN

Supply Voltage Range

Note 4

Quiescent Current

VFB = 1.5V

VSHDN = 5V (Regulator off)

100

µA

IIN

Standby Quiescent Current

VSHDN = VIN

µA

(±1%)

(±2%)

1.217

1.205

1.230

1.243

1.255

VFB

Feedback Voltage

≤ VIN ≤ 34V, 0.1A ≤ ILOAD ≤ 0.8A

1.193

1.180

1.230

1.267

1.280

ILIM

Current Limit Accuracy,

Note 7

See Test Circuit, VOUT = 3.6V

0.9

1.1

fSW

Oscillator Frequency

180

200

220

kHz

DMAX

Maximum Duty Cycle

VFB = 1.0V

VSW

Switch Saturation Voltage

IOUT = 1A

1.4

1.8

VIN = 34V, VSHDN = 5V, VSW = 0V

100

µA

ISW

Switch Leakage Current

VIN = 34V, VSHDN = 5V, VSW = –1V

Regulator Off

1.4

VSHDN

Shutdown Input Logic Level

Regulator On

1.25

0.8

VSHDN = 5V (Regulator Off)

–10

–0.5

µA

ISHDN

Shutdown Input Current

VSHDN = 0V (Regulator On)

–10

–0.5

µA

Thermal Shutdown

160

°C

Notes:

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

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

3. Absolute maximum rating is intended for voltage transients only; prolonged DC operation is not recommended.

4. VIN(MIN) = VOUT + 2.5V or 4V whichever is greater.

5. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k

Ω in series with 100pF.

6. Measured on 1.5” square of 1oz. copper FR4 printed circuit board connected to the device ground leads.

7. Short circuit protection is guaranteed to VIN = 30V max.

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