R1234D321B 데이터 시트보기 (PDF) - RICOH Co.,Ltd.

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R1234D321B

PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier

RICOH Co.,Ltd. 

• R1234DxxxC

Symbol

VIN

VFB

∆VFB/∆Topt

fosc

IDD

Istandby

RONP

RONN

ILXleak

IVFBleak

ICE

IMODE

VCEH

VCEL

VMODEH

VMODEL

Maxduty

tstart

VLXlim

Tprot

VUVLO1

VUVLO2

VFMduty

Item

Operating Input Voltage

Feedback Voltage

Feedback Voltage

Temperature Coefficient

Oscillator Frequency

Supply Current

Standby Current

ON Resistance of Pch Transistor

ON Resistance of Nch Transistor

LX Leakage Current

VFB Leakage Current

CE Input Current

MODE Pin Input Current

CE "H" Input Voltage

CE "L" Input Voltage

MODE "H" Input Voltage

MODE "L" Input Voltage

Oscillator Maximum Duty Cycle

LX Limit Voltage

Delay Time by Soft-Start function

Delay Time for protection circuit

UVLO Threshold Voltage

UVLO Released Voltage

VFM Duty Cycle

Conditions

VIN=VCE=VSET+1.5V,

VMODE=0V, IOUT=10mA

−40°C <= Topt <= 85°C

VIN=VCE=VSET+1.5V

VIN=VCE=VSET+1.5V,

VFB =VMODE=0V

VIN=5.5V, VCE=VFB=0V

VIN=5.0V

VIN=5.0V

VIN=5.5V, VCE=0V,

VLX=0V or 5.5V

VIN=5.5V, VCE=0V,

VFB=0V or 5.5V

VIN=5.5V, VMODE=0V,

VCE=5.5V or 0V

VIN=5.5V, VCE=0V,

VMODE=5.5V or 0V

VIN=5.5V, VFB=0V

VIN=2.4V, VFB=0V

VIN=VCE=5.5V, VFB=0V

VIN=VCE=2.4V, VFB=0V

VMODE=0V

at no load,

VIN=VCE=VSET+1.5V

VMODE=VFB=0V,

VIN=VCE=3.0V

VIN=VCE=3.6V,

VMODE=0V

VIN=VCE=2.5V→1.5V,

VMODE=0V

VIN=VCE=1.5V→2.7V,

VFB=0V

VIN=VCE=VMODE=2.4V,

VFB=0V

R1234D

Min.

2.7

Typ.

Topt=25°C

Max. Unit

5.5

V

0.776 0.800 0.824 V

±300

ppm/

°C

425 500 575 kHz

230 300 µA

0

5

µA

0.2 0.4 0.9 Ω

0.2 0.6 0.9 Ω

−5.0 0.0 5.0 µA

−0.1 0.0 0.1 µA

−0.1 0.0 0.1 µA

−0.1

0.1 µA

1.5

V

0.3

V

1.5

V

0.3

V

100

%

0.5 1.5 2.5 ms

VIN

VIN

VIN

−0.15 −0.35 −0.65

V

0.5 1.5 2.5 ms

1.95 2.20 2.45 V

2.20 2.40 2.65 V

55

65

85

%

7

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