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R1234D291B Datasheet(PDF) 8 Page - RICOH electronics devices division

Part # R1234D291B
Description  PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier
Download  26 Pages
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

R1234D291B Datasheet(HTML) 8 Page - RICOH electronics devices division

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R1234D
8
R1234DxxxD
Topt
=25°C
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
VIN
Operating Input Voltage
2.7
5.5
V
VFB
Feedback Voltage
VIN
=VCE=VSET+1.5V,
VMODE
=0V, IOUT=10mA
0.776
0.800
0.824
V
∆VFB/∆Topt
Feedback Voltage
Temperature Coefficient
−40°C <
= Topt <
= 85°C
±300
ppm/
°C
fosc
Oscillator Frequency
VIN
=VCE=VSET+1.5V
680
800
920
kHz
IDD
Supply Current
VIN
=VCE=VSET+1.5V,
VFB
=VMODE=0V
250
400
µA
Istandby
Standby Current
VIN
=5.5V, VCE=VFB=0V
0
5
µA
RONP
ON Resistance of Pch Transistor
VIN
=5.0V
0.2
0.4
0.9
RONN
ON Resistance of Nch Transistor
VIN
=5.0V
0.2
0.6
0.9
ILXleak
LX Leakage Current
VIN
=5.5V, VCE=0V,
VLX
=0V or 5.5V
−5.0
0.0
5.0
µA
IVFBleak
VFB Leakage Current
VIN
=5.5V, VCE=0V,
VFB
=0V or 5.5V
−0.1
0.0
0.1
µA
ICE
CE Input Current
VIN
=5.5V, VMODE=0V,
VCE
=5.5V or 0V
−0.1
0.0
0.1
µA
IMODE
MODE Pin Input Current
VIN
=5.5V, VCE=0V,
VMODE
=5.5V or 0V
−0.1
0.1
µA
VCEH
CE "H" Input Voltage
VIN
=5.5V, VFB=0V
1.5
V
VCEL
CE "L" Input Voltage
VIN
=2.4V, VFB=0V
0.3
V
VMODEH
MODE "H" Input Voltage
VIN
=VCE=5.5V, VFB=0V
1.5
V
VMODEL
MODE "L" Input Voltage
VIN
=VCE=2.4V, VFB=0V
0.3
V
Maxduty
Oscillator Maximum Duty Cycle
VMODE
=0V
100
%
tstart
LX Limit Voltage
at no load,
VIN
=VCE=VSET+1.5V
0.5
1.5
2.5
ms
VLXlim
Delay Time by Soft-Start function
VMODE
=VFB=0V,
VIN
=VCE=3.0V
VIN
−0.15
VIN
−0.35
VIN
−0.65
V
Tprot
Delay Time for protection circuit
VIN
=VCE=3.6V,
VMODE
=0V
0.5
1.5
2.5
ms
VUVLO1
UVLO Threshold Voltage
VIN
=VCE=2.5V→1.5V,
VMODE
=0V
1.95
2.20
2.45
V
VUVLO2
UVLO Released Voltage
VIN
=VCE=1.5V→2.7V,
VFB
=0V
2.20
2.40
2.65
V
VFMduty
VFM Duty Cycle
VIN
=VCE=VMODE=2.4V,
VFB
=0V
55
65
85
%


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