MIC2298 datasheet(3/13 Pages) MICREL

3 / 13 page

Micrel, Inc.

MIC2298

October 2007

M9999-101707-B

Absolute Maximum Ratings

(1)

Supply Voltage (VIN).......................................................12V

Switch Voltage (VSW)....................................... –0.3V to 34V

BRT Voltage (VBRT) ........................................... –0.3V to 6V

SS/DIM Voltage (VSS)........................................ –0.3V to 6V

Enable Voltage (VEN)....................................... –0.3V to 12V

FB Voltage (VFB)...............................................................6V

Switch Current (ISW) .........................................................6A

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

ESD Rating

(3).................................................................. 2kV

Operating Ratings

(2)

Supply Voltage (VIN).......................................... 2.5V to 10V

BRT Voltage (VBRT) ........................................... 0V to 0.6VIN

Enable Voltage (VEN).............................................. 0V to VIN

Output Voltage (VOUT) ................................... VIN + 1 to VOVP

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

Package Thermal Impedance

3x3 MLF-12 (

θJA) ...............................................60°C/W

Electrical Characteristics

(4)

TA = 25°C; VIN = VEN = 3.6V; VOUT = 7V; IOUT = 1A, unless otherwise noted. Bold values indicate –40°C< TJ < +125°C.

Symbol

Parameter

Condition

Min

Typ

Max

Units

VIN

Supply Voltage Range

2.5

VUVLO

Under-Voltage Lockout

1.8

2.1

2.4

VOVP

Over-Voltage Protection

13.5

IVIN

Quiescent Current

VFB >200mV, Not Switching

ISD

Shutdown Current

VEN = 0V (Note 5)

0.1

µA

VFB

Feedback Voltage

(+/-8%)

(+/-10%) (Over Temp)

184

180

200

216

220

IFB

Feedback Input Current

VFB = 200mV

-650

Line Regulation

2.5V

≤ VIN ≤ 4.5V

0.5

ILED

BRT accuracy (Note 6)

RBRT = GND

RBRT = 50K

DMAX

Maximum Duty Cycle

ISW

Switch Current Limit

VIN = 3V

3.5

4.75

VSW

Switch Saturation Voltage

VIN = 3.6V, ISW = 3.5 A

350

500

ISW

Switch Leakage Current

VEN = 0V, VSW = 15V

0.01

µA

VEN

Enable Threshold

TURN ON

TURN OFF

1.5

0.4

IEN

Enable Pin Current

VEN = 10V

µA

fSW

Oscillator Frequency

0.8

1.2

MHz

ISS

Soft start / DIM current

DIM = 0V

µA

150

°C

Over-Temperature Threshold

Shutdown

Hysteresis

°C

Notes:

1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating

the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(Max), the

junction-to-ambient thermal resistance,

θ JA, and the ambient temperature, TA. The maximum allowable power dissipation will result in excessive die

temperature, and the regulator will go into thermal shutdown.

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

3. Devices are ESD sensitive. Handling precautions recommended.

4. Specification for packaged product only.

5. ISD = IVIN

6. As percentage of full brightness where VIN = VBRT = 3.6V (100% brightness)

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