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參數(shù)資料
| 型號： | R1234D261B |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
| 中文描述： | 脈寬調(diào)制/ VFM的降壓型DC / DC同步整流變換器 |
| 文件頁數(shù)： | 7/26頁 |
| 文件大小： | 876K |
| 代理商： | R1234D261B |
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R1234D
R1234DxxxC
7
Topt
=
25
°
C
Unit
V
Symbol
V
IN
Item
Conditions
Min.
2.7
Typ.
Max.
5.5
Operating Input Voltage
V
IN
=
V
CE
=
V
SET
+
1.5V,
V
MODE
=
0V, I
OUT
=
10mA
V
FB
Feedback Voltage
0.776 0.800 0.824
V
V
FB
/
Topt
Feedback Voltage
Temperature Coefficient
Oscillator Frequency
40
°
C
<
=
Topt
<
=
85
°
C
±
300
ppm/
°
C
kHz
fosc
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
425
500
575
I
DD
Supply Current
230
300
μ
A
Istandby
Standby Current
0
5
μ
A
R
ONP
ON Resistance of Pch Transistor
0.2
0.4
0.9
R
ONN
ON Resistance of Nch Transistor
0.2
0.6
0.9
I
LXleak
L
X
Leakage Current
5.0
0.0
5.0
μ
A
I
VFBleak
V
FB
Leakage Current
0.1
0.0
0.1
μ
A
I
CE
CE Input Current
0.1
0.0
0.1
μ
A
I
MODE
MODE Pin Input Current
0.1
0.1
μ
A
V
CEH
CE "H" Input Voltage
1.5
V
V
CEL
CE "L" Input Voltage
0.3
V
V
MODEH
MODE "H" Input Voltage
1.5
V
V
MODEL
MODE "L" Input Voltage
0.3
V
Maxduty
Oscillator Maximum Duty Cycle
100
%
tstart
L
X
Limit Voltage
0.5
1.5
2.5
ms
V
LXlim
Delay Time by Soft-Start function
V
IN
0.15
V
IN
0.35
V
IN
0.65
V
Tprot
Delay Time for protection circuit
0.5
1.5
2.5
ms
V
UVLO1
UVLO Threshold Voltage
1.95
2.20
2.45
V
V
UVLO2
UVLO Released Voltage
2.20
2.40
2.65
V
VFMduty
VFM Duty Cycle
55
65
85
%
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