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RT9261

VFM Step-Up DC/DC Converter

Richtek Technology 

Preliminary

RT9261/A

Absolute Maximum Ratings

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

z LX Pin Voltage (1) ------------------------------------------------------------------------------------ 8V

z EXT Pin Voltage (2) --------------------------------------------------------------------------------------------------- − 0.3 to VOUT +0.3V

z EN Pin Voltage (3) ---------------------------------------------------------------------------------------------------- − 0.3 to VOUT +0.3V

z LX Pin Output Current (1) -------------------------------------------------------------------------------------------- 250mA

z EXT Pin Current (2) --------------------------------------------------------------------------------------------------- ± 50mA

z Power Dissipation, PD @ TA = 25°C

SOT-89 ------------------------------------------------------------------------------------------------------------------ 0.5W

SOT-23-5 --------------------------------------------------------------------------------------------------------------- 0.25W

z Package Thermal Resistance

SOT-89, θJC ------------------------------------------------------------------------------------------------------------ 100° C/W

SOT-89, θJA ------------------------------------------------------------------------------------------------------------ 300° C/W

SOT-23-5, θJA ---------------------------------------------------------------------------------------------------------- 250° C/W

z Operating Temperature Range ------------------------------------------------------------------------------------- − 20 to +85°C

z Storage Temperature Range --------------------------------------------------------------------------------------- 165°C

z Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------- 260°C

Notes:

(1) Applicable to RT9261- CX and RT9261- CB

(2) Applicable to RT9261A- CX and RT9261A- CB

(3) Applicable to RT9261- CB and RT9261A- CB

Electrical Characteristics (Refer to Figure 1)

Parameter

Symbol

Test Conditions

Min Typ Max Units

Output Voltage Accuracy

ΔVOUT

-2 -- +2 %

Input Voltage

VIN

-- -- 7 V

Start-up Voltage

VST

IOUT = 1mA, VIN: 0 → 2V

-- 0.85 1.0 V

Hold-on Voltage

VHO

IOUT = 1mA, VIN: 2 → 0V 0.7 --

--

V

Input Current 1

VOUT ≤ 3.5V (1)

3.5V < VOUT ≤ 5V (2)

To be measured at VIN at

no load

-- 15 18

μA

-- 18 24

Input Current 2

To be measured at VOUT in

switch off condition

--

5

8 μA

LX Switching Current VOUT ≤ 3.5V (1)

3.5V < VOUT ≤ 5V (2)

ISWITCHING

VLX = 0.4V

60 -- --

mA

80 -- --

LX Leakage Current

ILEAKAGE VLX = 6V

-- -- 0.5 μA

Maximum Oscillator

FMAX

80 120 160 kHz

Oscillator Duty Cycle

DOSC

On ( VLX ” L ” ) side

65 75 85 %

Efficiency

-- 75 -- %

VLX Voltage Limit

LX switch on

0.65 0.8 1.0 V

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

DS9261/A-12 March 2007

www.richtek.com

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