r1230d RICOH Co.,Ltd., r1230d Datasheet - Page 5

• Manufacturer Part Number: r1230d
• Description: Pwm/vfm Step-down Dc/dc Converter With Synchronous Rectifier
• Manufacturer: RICOH Co.,Ltd.

V
V
Symbol
V
V
VFMdty VFM Duty Cycle
Maxdty
I
Rev. 1.12
I
R
LX
I
R
V
V
MODEH
V
T
MODEL
V
MODE
VOUT
T
UVLO1
UVLO2
fosc
fosc
V
V
I
I
I
I
OUT
ONP
ONN
CEH
DD
DD
CEL
start
stb
CE
prot
OUT
ELECTRICAL CHARACTERISTICS
R1230D**1A/B
leak Lx Leakage Current
LX
IN
T
/
ON Resistance of
Pch Transistor
ON Resistance of
Nch Transistor
V
Oscillator Maximum Duty Cycle
Delay Time by Soft-Start function
Delay Time for protection circuit
UVLO Threshold Voltage
UVLO Released Voltage
MODE Pin Input Current
MODE ”H” Input Voltage
MODE ”L” Input Voltage
Operating Input Voltage
Step-down Output Voltage
Step-down Output Voltage
Temperature Coefficient
Oscillator Frequency(xx1A)
Oscillator Frequency(xx1B)
Supply Current(xx1A)
Supply Current(xx1B)
Standby Current
CE Input Current
CE "H" Input Voltage
CE "L" Input Voltage
Lx Limit Voltage
OUT
Leakage Current
Item
V
I
V
V
V
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
OUT
IN
OUT
IN
IN
IN
IN
IN
IN
IN
IN
MODE
MODE
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
=5.5V, V
=V
=V
=V
=10mA
=V
=V
CE
CE
CE
CE
CE
CE
CE
CE
CE
CE
CE
=0V
= V
MODE
MODE
=V
=V
=V
=V
=V
=V
=2.5V->1.5V, V
=1.5V->2.5V, V
=5.5V, V
=2.4V, V
= V
- 5 -
OUT
Topt
SET
SET
SET
SET
SET
SET
CE
CE
CE
MODE
OUT
CE
OUT
MODE
IN
=0V
=0V
=0V, V
=V
=0V, V
=0V, V
=0V, V
Conditions
=V
+1.5V, V
+1.5V
+1.5V
+1.5V,
+1.5V,
+1.5V, V
=0V
=0V
OUT
85 C
=0V, V
CE
OUT
OUT
=2.4V, V
=V
IN
=0V
LX
LX
MODE
=0V
=0V
=V
SET
=0V/5.5V
=0V/5.5V
MODE
MODE
CE
OUT
OUT
CE
+1.5V
OUT
=5.5V/0V
=5.5V/0V
=0V
=0V
=3.0V
=0V,
=0V
=0V
V
TYP.
0.980
IN
MIN.
0.20
0.20
-0.1
-0.1
-0.1
-0.1
425
680
100
2.4
1.5
0.5
0.5
1.8
1.9
1.5
55
-0.15 V
IN
V
TYP.
0.35
0.45
500
800
230
250
0.0
0.0
0.0
1.5
1.5
2.1
2.2
150
65
SET
-0.35 V
0
(Topt=25 C)
TYP.
MAX. Unit
1.020
0.60
0.70
0.55
575
920
300
350
5.5
0.1
0.1
0.1
0.3
2.5
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