RH5RI251B 데이터 시트보기 (PDF) - RICOH Co.,Ltd.

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RH5RI251B

VFM STEP-UP DC/DC CONVERTER

RICOH Co.,Ltd. 

RH5RI

• RH5RI303B

Symbol

VOUT

VIN

Vstart

Vhold

η

Item

Output Voltage

Input Voltage

Start-up Voltage

Hold-on Voltage

Efficiency

IIN1

Input Current 1

IIN2

Input Current 2

ILX

ILXleak

IEXTH

IEXTL

VCEH1

VCEL1

VCEH2

VCEL2

ICEH

ICEL

fosc

Maxdty

VLXlim

Lx Switching Current

Lx Leakage Current

EXT “H” Output Current

EXT “L” Output Current

CE “H” Level 1

CE “L” Level 1

CE “H” Level 2

CE “L” Level 2

CE “H” Input Current

CE “L” Input Current

Maximum Oscillator

Frequency

Oscillator Duty Cycle

VLX Voltage Limit

Conditions

IOUT=1mA,VIN:0→2V

IOUT=1mA,VIN:2→0V

To be measured at VIN

at no load

VOUT=3.0V

MIN. TYP. MAX. Unit Note

2.925 3.000 3.075 V

8

V

0.8 0.9

V

0.7

V

70 80

%

4

8

µA

To be measured at VIN

VIN=3.5V

VLX=0.4V

VLX=6V,VIN=3.5V

VEXT=VOUT–0.4V

VEXT=0.4V

VOUT≥1.5V

VOUT≥1.5V

0.8V≤VOUT<1.5V

0.8V≤VOUT<1.5V

CE=3V

CE=0V

2

60

1.5

VOUT–0.4

VOUT–0.1

– 0.5

5

µA

mA

0.5 µA

–1.5 mA

mA

V

0.4

V

V

0.1

V

0.5 µA

µA

80 100 120 kHz

on (VLX “L” )side

Lx Switch on

65

75

85

0.65 0.8 1.0

%

V Note

Unless otherwise provided, VIN=1.8V, VSS=0V, IOUT=10mA, Topt=25˚C, and use External Circuit of Typical

Application (FIG. 3).

(Note) ILX is gradually increased by the external inductor after Lx Switch is turned ON. In accordance with the increase of ILX, VLX is also increased.

When VLX reaches VLXlim, Lx Switch is turned OFF by Lx Switch Protection Circuit. The time period from the time at which VLX reaches VLXlim to

the time at which Lx Switch is turned OFF is about 3µs.

8

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