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RT9261-27CX

VFM Step-up DC/DC Converter

Richtek Technology 

Preliminary

RT9261/A

Electrical Characteristics (Refer to Fig. 2)

Parameter

Symbol

Test Conditions

Min Typ Max Units

Output Voltage Accuracy

∆VOUT

-2 -- +2 %

Input Voltage

VIN

--

--

7

V

Start-up Voltage

Input Current 1

Input Current 2

EXT “H” Output

Current

EXT “L” Output

Current

VST

VOUT ≤ 3.5V (1)

3.5V < VOUT ≤ 5V (2)

VOUT ≤ 3.5V (1)

3.5V < VOUT ≤ 5V (2)

VOUT ≤ 3.5V (1)

3.5V < VOUT ≤ 5V (2)

VOUT ≤ 3.5V (1)

3.5V < VOUT ≤ 5V (2)

IOUT = 1mA, VIN : 0 → 2V

To be measured at VIN at no

load

To be measured at VOUT in

switch off condition

VEXT = VOUT – 0.4V

VEXT = 0.4V

-- 0.85 1.0 V

-- 30 50

--

60 90 µA

--

6 10 µA

-1.5 --

-2 --

1.5 --

2

--

--

mA

--

--

mA

--

Maximum Oscillator Frequency

FMAX

80 120 160 KHz

Oscillator Duty Cycle

DOSC VEXT ” H ” side

65 75 85 %

Notes:

(1) Unless otherwise provided, VIN = 1.8V, VSS = 0V, IOUT = 10mA, TOPT = 25°C, and use 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-03 January 2002

www.richtek-ic.com.tw

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