R1230D251B-TL RICOH [RICOH electronics devices division], R1230D251B-TL Datasheet - Page 6

• Manufacturer Part Number: R1230D251B-TL
• Description: PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier
• Manufacturer: RICOH [RICOH electronics devices division]

V
Symbol
V
V
VFMdty VFM Duty Cycle
Maxdty Oscillator Maximum Duty Cycle V
I
V
Rev. 1.12
I
R
R
LX
V
V
T
MODE
MODEL
T
UVLO1
UVLO2
fosc
fosc
I
V
MODE
R1230D001C/D
V
V
I
I
I
V
I
VFB
ONN
ONP
CEH
start
DD
DD
CE
CEL
stb
prot
leak Lx Leakage Current
FB
LX
IN
FB
T
/
ON Resistance of
Pch Transistor
ON Resistance of
Nch Transistor
V
UVLO Threshold Voltage
UVLO Released Voltage
MODE Pin Input Current
MODE ”H” Input Voltage
MODE ”L” Input Voltage
Operating Input Voltage
Feedback Voltage
Feedback Voltage
Temperature Coefficient
Oscillator Frequency(xx1C)
Oscillator Frequency(xx1D)
Supply Current(xx1C)
Supply Current(xx1D)
Standby Current
CE Input Current
CE "H" Input Voltage
CE "L" Input Voltage
Lx Limit Voltage
Delay Time by Soft-Start function
Delay Time for protection circuit
FB
Leakage Current
Item
V
I
V
V
V
V
V
V
V
V
V
V
V
V
V
at no load, V
V
V
V
V
V
V
V
OUT
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
MODE
IN
IN
IN
IN
IN
IN
IN
IN
-40 C
=V
=V
=V
=V
=V
=5.5V, V
=5.0V
=5.0V
=5.5V, V
=5.5V, V
=5.5V, V
=5.5V, V
=2.4V, V
=V
=V
=V
=V
=5.5V, V
=V
=V
=V
=10mA
CE
CE
CE
CE
CE
CE
CE
CE
CE
CE
CE
CE
=0V
=V
=V
=V
=5.5V, V
=5.5V, V
=3.0V, V
=3.6V, V
=2.5V->1.5V, V
=1.5V->2.5V, V
=5.5V, V
=2.4V, V
=V
Topt
SET
SET
SET
MODE
CE
CE
CE
FB
MODE
FB
MODE
IN
- 6 -
Conditions
=0V
=V
=0V, V
=0V, V
=0V
=V
+1.5V, V
+1.5V
+1.5V
=2.4V, V
FB
MODE
MODE
CE
85 C
FB
FB
FB
FB
=0V, V
=5.5V/0V, V
=0V
=V
=V
=V
=0V
=0V
LX
FB
MODE
MODE
=0V, V
SET
=0V
=0V/5.5V
=0V/5.5V
MODE
FB
FB
CE
FB
+1.5V
=0V
=0V
=5.5V/0V
=0V
=0V
=0V
=0V,
FB
CE
=0V
=0V
V
0.776
IN
MIN.
0.20
0.20
425
680
-0.1
-0.1
-0.1
100
-0.1
2.4
1.5
0.5
1.8
1.9
1.5
55
-0.15
0.800
TYP.
0.35
0.45
0.35
V
500
800
230
250
0.0
0.0
0.0
1.5
1.5
2.1
2.2
150
65
0
IN
-
(Topt=25 C)
0.824
MAX. Unit
0.60
0.70
0.55
V
575
920
300
350
5.5
0.1
0.1
0.1
0.3
2.5
2.2
2.3
0.1
0.3
85
5
IN
-
ppm
kHz
kHz
/ C
ms
ms
%
%
V
V
V
V
V
V
V
V
V
A
A
A
A
A
A
A