RT9261B-12CX Просмотр технического описания (PDF) - Richtek Technology

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RT9261B-12CX

VFM Step-up DC/DC Converter

Richtek Technology 

Preliminary

RT9261B

Absolute Maximum Ratings

z Output Voltage

z LX Pin Voltage

z CE Pin Voltage(1)

z LX Pin Output Current

z Power Dissipation, PD @ TA = 25°C

SOT-89

SOT-25

z Package Thermal Resistance

SOT-89, θJC

SOT-89, θJA

SOT-25, θJA

z Operating Temperature Range

z Storage Temperature Range

z Lead Temperature (Soldering, 10 sec.)

Notes: (1) Applicable to RT9261B-xxCB

8V

8V

-0.3 to VOUT +0.3V

400mA

0.5W

0.25W

100°C/W

300°C/W

250°C/W

-20 to +85°C

-65°C to 150°C

260°C

Electrical Characteristics (Refer to Fig. 1)

Parameter

Symbol

Test Conditions

Min Typ

Output Voltage Accuracy

∆VOUT

Input Voltage

VIN

Start-up Voltage

VST

Hold-on Voltage

Input Current 1

VHO

VOUT ≤ 3.5V (1)

3.5V < VOUT ≤ 5V (2)

IOUT = 1mA, VIN: 0 → 2V

IOUT = 1mA, VIN: 2 → 0V

To be measured at VIN in

continuous switching

-2 --

--

--

-- 0.8

0.7 --

-- 24

-- 36

Input Current 2 (1) (2)

To be measured at VOUT in

switch off condition

--

6.5

Input Current 3

VOUT ≤ 3.5V (1)

3.5V < VOUT ≤ 5V (2)

To be measured at VIN in

no load (guaranteed by I1

and I2)

LX Switching Current

VOUT ≤ 3.5V (1)

3.5V < VOUT ≤ 5V (2)

ISWITCHING

VLX = 0.4V

LX Leakage Current

ILEAKAGE VLX = 6V

Maximum Oscillator Frequency

FMAX

Oscillator Duty Cycle

DOSC

On (VLX “L”) side

Efficiency

-- 18

-- 20

120 --

160 --

--

--

140 190

65 75

-- 80

VLX Voltage Limit

LX switch on

0.65 0.8

Notes:

(1) VIN = 1.8V, VSS = 0V, IOUT = 1mA, Topt = 25°C, and External Circuit of Typical Application

(2) VIN = 3V, VSS = 0V, IOUT = 1mA, Topt = 25°C, and External Circuit of Typical Application

Max Units

+2 %

7

V

1

V

--

V

36

45 µA

10 µA

36

µA

45

--

mA

--

0.5 µA

240 KHz

85 %

-- %

1.0 V

DS9261B-03 September 2001

www.richtek-ic.com.tw

3

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