RT9270 datasheet(4/13 Pages) RICHTEK

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RT9270

Preliminary

DS9270-09 March 2007

www.richtek.com

Absolute Maximum Ratings

(Note 1)

Supply Voltage, VIN ---------------------------------------------------------------------------------------------------

−0.3 to 6V

LX to GND ---------------------------------------------------------------------------------------------------------------

−0.3V to 16V

The other pins ----------------------------------------------------------------------------------------------------------

−0.3V to 6V

Power Dissipation, PD @ TA = 70

°C

MSOP-8 ----------------------------------------------------------------------------------------------------------------- 300mW

Junction Temperature ------------------------------------------------------------------------------------------------- 150

°C

Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260

°C

Operation Temperature Range --------------------------------------------------------------------------------------

−40°C to 85°C

Storage Temperature Range ----------------------------------------------------------------------------------------

−65°C to 150°C

ESD Susceptibility (Note 2)

HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV

MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V

Electrical Characteristics

(VIN = 3V, FREQ left floating, TA = 25

°C, Unless Otherwise specification)

Recommended Operating Conditions

(Note 3)

Ambient Temperature Range ---------------------------------------------------------------------------------------- 0

°C to 70°C

Junction Temperature Range ---------------------------------------------------------------------------------------- 0

°C to 125°C

Parameter

Symbol

Test Condition

Min

Typ

Max

Units

System Supply Input

FREQ = GND

2.3

5.5

Operation voltage Range

VIN

FREQ = VIN

2.5

5.5

Under Voltage Lock Out

UVLO

2.2

2.3

Power On Reset Hysteresis

200

IIN

VFB=1.3V, No switching

270

600

Quiescent Current

IIN

VFB=1.0V, Switching, No load

1.76

Shut Down Current

IIN

EN = GND

Soft start Current

ISS

Switching Regulator Oscillator

FREQ=GND

520

670

850

kHz

Free Run Frequency

fOSC

FREQ= VIN

960

1300

1500

kHz

FREQ = GND

Maximum Duty Cycle (Note 4)

FREQ = VIN

Reference Voltage

Feedback Voltage

VFB

1.216

1.24

1.264

Error Amplifier

(Note 4)

1.1

Feedback Voltage Line Regulation

2.3V<VIN<5.5V

0.12

0.3

%/V

To be continued

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