R1234D311A データシートの表示（PDF） - RICOH Co.,Ltd.

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R1234D311A

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

RICOH Co.,Ltd. 

R1234D

ELECTRICAL CHARACTERISTICS

• R1234DxxxA

Symbol

VIN

Item

Operating Input Voltage

VOUT

Step-down Output Voltage

∆VOUT/∆Topt

Step-down Output Voltage

Temperature Coefficient

fosc

Oscillator Frequency

IDD

Supply Current

Istandby

RONP

RONN

Standby Current

ON Resistance of Pch Transistor

ON Resistance of Nch Transistor

ILXleak

LX Leakage Current

IVOUTleak

VOUT Leakage Current

ICE

CE Input Current

IMODE

VCEH

VCEL

VMODEH

VMODEL

Maxduty

tstart

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

VLXlim

LX Limit Voltage

Tprot

Delay Time for protection circuit

VUVLO1

UVLO Threshold Voltage

VUVLO2

UVLO Released Voltage

VFMduty 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,

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.

Typ.

×0.98 VSET ×1.02 V

±150

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

1.8 2.1 2.2

V

1.9 2.2 2.3

V

55

65

85

%

5

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