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Номер в каталоге
Компоненты Описание
R1234D311A Просмотр технического описания (PDF) - RICOH Co.,Ltd.
Номер в каталоге
Компоненты Описание
производитель
R1234D311A
PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier
RICOH Co.,Ltd.
R1234D311A Datasheet PDF : 26 Pages
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R1234DxxxC
Symbol
V
IN
V
FB
∆
V
FB
/
∆
Topt
fosc
I
DD
Istandby
R
ONP
R
ONN
I
LXleak
I
VFBleak
I
CE
I
MODE
V
CEH
V
CEL
V
MODEH
V
MODEL
Maxduty
tstart
V
LXlim
Tprot
V
UVLO1
V
UVLO2
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
L
X
Leakage Current
V
FB
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
L
X
Limit Voltage
Delay Time by Soft-Start function
Delay Time for protection circuit
UVLO Threshold Voltage
UVLO Released Voltage
VFM Duty Cycle
Conditions
V
IN
=
V
CE
=
V
SET
+
1.5V,
V
MODE
=
0V, I
OUT
=
10mA
−
40
°
C
<=
Topt
<=
85
°
C
V
IN
=
V
CE
=
V
SET
+
1.5V
V
IN
=
V
CE
=
V
SET
+
1.5V,
V
FB
=
V
MODE
=
0V
V
IN
=
5.5V, V
CE
=
V
FB
=
0V
V
IN
=
5.0V
V
IN
=
5.0V
V
IN
=
5.5V, V
CE
=
0V,
V
LX
=
0V or 5.5V
V
IN
=
5.5V, V
CE
=
0V,
V
FB
=
0V or 5.5V
V
IN
=
5.5V, V
MODE
=
0V,
V
CE
=
5.5V or 0V
V
IN
=
5.5V, V
CE
=
0V,
V
MODE
=
5.5V or 0V
V
IN
=
5.5V, V
FB
=
0V
V
IN
=
2.4V, V
FB
=
0V
V
IN
=
V
CE
=
5.5V, V
FB
=
0V
V
IN
=
V
CE
=
2.4V, V
FB
=
0V
V
MODE
=
0V
at no load,
V
IN
=
V
CE
=
V
SET
+
1.5V
V
MODE
=
V
FB
=
0V,
V
IN
=
V
CE
=
3.0V
V
IN
=
V
CE
=
3.6V,
V
MODE
=
0V
V
IN
=
V
CE
=
2.5V
→
1.5V,
V
MODE
=
0V
V
IN
=
V
CE
=
1.5V
→
2.7V,
V
FB
=
0V
V
IN
=
V
CE
=
V
MODE
=
2.4V,
V
FB
=
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
µ
A
0
5
µ
A
0.2 0.4 0.9
Ω
0.2 0.6 0.9
Ω
−
5.0 0.0 5.0
µ
A
−
0.1 0.0 0.1
µ
A
−
0.1 0.0 0.1
µ
A
−
0.1
0.1
µ
A
1.5
V
0.3
V
1.5
V
0.3
V
100
%
0.5 1.5 2.5 ms
V
IN
V
IN
V
IN
−
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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