MIC2297 datasheet(3/11 Pages) MICREL

3 / 11 page

Micrel, Inc.

MIC2297

Mach 2008

M9999-032708

Absolute Maximum Rating

(1)

Supply voltage (VIN)........................................................12V

Switch voltage (VSW) ........................................ -0.3V to 50V

Enable pin voltage (VEN)....................................... -0.3 to VIN

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

VBRT ..................................................................................6V

Switch Current (ISW) .........................................................3A

Ambient Storage Temperature (TS)............-65°C to +150°C

ESD Rating

(3)................................................................ 2KV

Operating Range

(2)

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

Maximum Output Voltage (VOUT)....................................40V

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

Package Thermal Impedance

MLF

®-10 (θJA).....................................................65°C/W

Electrical Characteristics

TA=25

oC, V

IN =VEN = 3.6V, VOUT = 30V, IOUT = 20mA, 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

IVIN

Quiescent Current

VFB = 200mV (not switching)

mA

ISD

Shutdown Current

VEN = 0V

(4)

0.1

µA

(+/-5%)

190

200

210

VFB

Feedback Voltage

(+/±6.5%) (Over Temp)

187

213

IFB

Feedback Input Current

VFB = 200mV

-450

Line Regulation

(5)

2.5V

≤ VIN ≤ 4.5V

0.5

Load Regulation

(5)

5mA

≤ IOUT ≤ 20mA

0.5

DMAX

Maximum Duty Cycle

ISW

Switch Current Limit

VIN 2.5V

1.2

1.7

2.5

VSW

Switch Saturation Voltage

VIN = 2.5V, ISW = 0.5A

220

ISW

Switch Leakage Current

VEN = 0V, VIN = 10V

0.01

µA

VEN

Enable Threshold

TURN ON

TURN OFF

1.5

0.4

IEN

Enable Pin Current

VEN = 10V

µA

VREF

Brightness Control Accuracy

VBRT = 0V

VBRT = 1V

VBRT = 5V

VBRT = OPEN

0.185

0.93

0.19

0.2

1.0

0.2

0.015

0.215

1.05

0.21

fSW

Oscillator Frequency

525

600

675

KHz

VOVP

Over Voltage protection

MIC2297-42BML (nominal voltage)

MIC2297-15BML (nominal voltage)

40.5

150

°C

Over-Temperature Threshold

Shutdown

Hysteresis

°C

Notes:

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, θJA, and the ambient temperature, TA. The maximum allowable power

dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.

This device is not guaranteed to operate beyond its specified operating rating.

IC devices are inherently ESD sensitive. Handling precautions required. Human body model.

ISD = IVIN.

Guaranteed by design.

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