RT9277APF datasheet(5/12 Pages) RICHTEK

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RT9277A/B

Preliminary

DS9277A/B-02 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 ----------------------------------------------------------------------------------------------------------------- 625mW

Package Thermal Resistance (Note 4)

MSOP-8,

θJA------------------------------------------------------------------------------------------------------------ 160°C/W

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

°C

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

°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)

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

−40°C to 125°C

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

−40°C to 85°C

Parameter

Symbol

Test Condition

Min

Typ

Max

Units

System Supply Input

Operation voltage Range

VIN

2.5

5.5

Under Voltage Lock Out

UVLO

1.9

2.1

Power On Reset Hysteresis

100

VFB = 1.3V, No switching

250

350

μA

Quiescent Current

VFB = 1.0V, Switching, No load

Shut Down Current

ISHDN

EN = GND

μA

Soft start Current (RT9277B)

ISS

VSS = 1.2V

1.5

μA

Switching Regulator Oscillator

FREQ = GND

540

640

740

kHz

Free Run Frequency

fOSC

FREQ = VIN

1200

kHz

Maximum Duty Cycle

Reference Voltage

Feedback Reference Voltage

VREF

VCOMP = 1.24V

1.222

1.24

1.258

Error Amplifier

Transconductance

140

240

μΩ

Voltage Gain

700

V/V

To be continued

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