RT9261 datasheet(2/14 Pages) RICHTEK

2 / 14 page

RT9261/A

Preliminary

www.richtek-ic.com.tw

DS9261/A-03 January 2002

Absolute Maximum Ratings

Output Voltage

LX Pin Voltage

(1)

EXT Pin Voltage

(2)

-0.3 to VOUT +0.3V

CE Pin Voltage

(3)

-0.3 to VOUT +0.3V

LX Pin Output Current

(1)

250mA

EXT Pin Current

(2)

±50mA

Power Dissipation, PD @ TA = 25

°C

SOT-89

0.5W

SOT-25

0.25W

Package Thermal Resistance

SOT-89,

θJC

100

°C/W

SOT-89,

θJA

300

°C/W

SOT-25,

θJA

250

°C/W

Operating Temperature Range

-20 to +85

°C

Storage Temperature Range

165

°C

Lead Temperature (Soldering, 10 sec.)

260

°C

Notes:

(1) Applicable to RT9261-

CX and RT9261-

(2) Applicable to RT9261A-

CX and RT9261A-

(3) Applicable to RT9261-

CB and RT9261A-

Electrical Characteristics (Refer to Fig. 1)

Parameter

Symbol

Test Conditions

Min

Typ

Max Units

Output Voltage Accuracy

∆VOUT

-2

Input Voltage

VIN

Start-up Voltage

VST

IOUT = 1mA, VIN: 0

→ 2V

0.85

1.0

Hold-on Voltage

VHO

IOUT = 1mA, VIN: 2

→ 0V

0.7

VOUT

≤ 3.5V

(1)

Input Current 1

3.5V

< VOUT ≤ 5V

(2)

To be measured at VIN at

no load

µA

Input Current 2

To be measured at VOUT

in switch off condition

µA

VOUT

≤ 3.5V

(1)

LX Switching Current

3.5V

< VOUT ≤ 5V

(2)

ISWITCHING VLX = 0.4V

LX Leakage Current

ILEAKAGE

VLX = 6V

0.5

µA

Maximum Oscillator

FMAX

120

160

KHz

Oscillator Duty Cycle

DOSC

On ( VLX ” L ” ) side

Efficiency

VLX Voltage Limit

LX switch on

0.65

0.8

1.0

Notes:

(1) VIN = 1.8V, VSS = 0V, IOUT = 10mA, TOPT = 25

°C, and External Circuit of Typical Application

(2) VIN = 3V, VSS = 0V, IOUT = 10mA, TOPT = 25

°C, and External Circuit of Typical Application

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