RT9261 datasheet(5/12 Pages) RICHTEK

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RT9261/A

Preliminary

DS9261/A-12 March 2007

www.richtek.com

Electrical Characteristics (Refer to Figure 1)

Parameter

Symbol

Test Conditions

Min

Typ

Max Units

Output Voltage Accuracy

ΔVOUT

-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)Unless otherwise provided, VIN = 1.8V, VSS = 0V, IOUT = 10mA, TOPT = 25°C, and External Circuit of Typical Application

(2)Unless otherwise provided, VIN = 3V, VSS = 0V, IOUT = 10mA, TOPT = 25° C, and External Circuit of Typical Application

Absolute Maximum Ratings

Output Voltage -------------------------------------------------------------------------------------------------------- 8V

LX Pin Voltage (1)

------------------------------------------------------------------------------------ 8V

EXT Pin Voltage (2) ---------------------------------------------------------------------------------------------------

− 0.3 to VOUT +0.3V

EN 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-23-5 --------------------------------------------------------------------------------------------------------------- 0.25W

Package Thermal Resistance

SOT-89,

θJC ------------------------------------------------------------------------------------------------------------ 100°C/W

SOT-89,

θJA ------------------------------------------------------------------------------------------------------------ 300°C/W

SOT-23-5,

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-

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