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. 

R1234D

• R1234DxxxB

Symbol

VIN

Item

Operating Input Voltage

Conditions

VOUT

Step-down Output Voltage

VIN=VCE=VSET+1.5V,

VMODE=0V, IOUT=10mA

∆VOUT/∆Topt

fosc

IDD

Istandby

RONP

RONN

ILXleak

IVOUTleak

ICE

IMODE

VCEH

VCEL

VMODEH

VMODEL

Maxduty

tstart

VLXlim

Tprot

VUVLO1

VUVLO2

VFMduty

Step-down Output Voltage

Temperature Coefficient

Oscillator Frequency

Supply Current

Standby Current

ON Resistance of Pch Transistor

ON Resistance of Nch Transistor

LX Leakage Current

VOUT 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

Delay Time by Soft-Start function

LX Limit Voltage

Delay Time for protection circuit

UVLO Threshold Voltage

UVLO Released Voltage

VFM Duty Cycle

−40°C <= Topt <= 85°C

VIN=VCE=VSET+1.5V

VIN=VCE=VSET+1.5V,

VOUT=VMODE=0V

VIN=5.5V, VCE=VOUT=0V

VIN=5.0V

VIN=5.0V

VIN=5.5V, VCE=0V,

VLX=0V or 5.5V

VIN=5.5V, VCE=0V,

VLX =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, VOUT=0V

VIN=2.4V, VOUT=0V

VIN=VCE=5.5V, VOUT=0V

VIN=VCE=2.4V, VOUT=0V

VMODE=0V

at no load,

VIN=VCE=VSET+1.5V

VMODE=VOUT=0V,

VIN=VCE=3.0V

VIN=VCE=VSET+1.5V,

VMODE=0V

VIN=VCE=2.5V→1.5V,

VOUT =0V

VIN=VCE=1.5V→2.5V,

VOUT=0V

VIN=VCE=VMODE=2.4V,

VOUT=0V

Topt=25°C

Min. Typ. Max. Unit

2.4

5.5 V

Typ.

×0.98

680

VSET

±150

800

Typ.

×1.02

920

V

ppm/

°C

kHz

250 450 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

1.8 2.1 2.2 V

1.9 2.2 2.3 V

55

65

85

%

6

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