R1218K021A RICOH [RICOH electronics devices division], R1218K021A Datasheet - Page 5

• Manufacturer Part Number: R1218K021A
• Description: Step-up DC/DC converter for White LED Backlight
• Manufacturer: RICOH [RICOH electronics devices division]

•
ELECTRICAL CHARACTERISTICS
Maxduty Maximum Duty Cycle
Symbol
I
R1218xxxxA
I
tshtdn
DIODEleak
V
V
standby
∆V
∆T
V
V
I
V
V
I
fosc
R
R
LXleak
V
UVLO1
UVLO2
V
LXlim
I
I
Vf
OVP1
OVP2
CEH
DD
CEL
FB
ON
CE
FB
IN
opt
FB
/
Operating Input Voltage
Supply Current
Standby Current
UVLO Detector Threshold
UVLO Released Voltage
CE Input Voltage "H"
CE Input Voltage "L"
CE Pull Down Resistance
CE Shutdown Delay Time
V
V
Coefficient
V
Switch On Resistance
Switch Leakage Current
Switch Current Limit
Oscillator Frequency
OVP Detector Threshold
OVP Released Voltage
Diode Forward Voltage
Diode Leakage Current
FB
FB
FB
Voltage
Voltage Temperature
Input Current
Item
V
V
V
V
V
V
V
V
V
V
V
V
R1218xxx1A
V
V
V
V
V
V
V
R1218xxx2A
R1218xxx1A I
R1218xxx1A V
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
OUT
IN
OUT
=5.5V, V
=5.5V, V
=5.5V
=1.8V
=3.6V
=3.6V
=3.6V
=3.6V, −40°C
=5.5V, V
=3.6V, I
=3.6V
=3.6V, V
=3.6V, V
=3.6V,
=3.6V,
falling
rising
rising
falling
SW
Conditions
FB
CE
FB
OUT
OUT
=100mA
=0V, Lx at no load
=0V or 5.5V
=0V
=V
=V
V
V
DIODE
OUT
< =
FB
FB
LX
LX
R1218x021A
R1218x031A
R1218x041A
R1218x052A
R1218x062A
R1218x021A
R1218x031A
R1218x041A
R1218x052A
R1218x062A
=20V
=0V
=0V
=29V
T
=20V, V
=100mA
opt < =
85°C
LX
=0V
Min.
0.19
−0.1
13.0
17.0
21.5
26.0
600
400
1.8
1.5
1.5
1.0
8.5
86
V
−0.75
−1.25
1200
±150
V
V
V
V
V
Typ.
0.20
14.0
18.5
23.0
27.5
+0.1
−0.5
−1.0
−1.5
700
0.5
1.6
1.5
0.8
1.2
9.5
UVLO1
10
10
91
OVP1
OVP1
OVP1
OVP1
OVP1
0
0
0
Max.
2200
1000
0.21
10.5
15.0
20.0
24.5
29.0
5.5
1.0
3.0
1.7
1.8
0.5
0.1
3.0
3.0
1.4
Topt=25°C
R1218x
Unit
ppm
MHz
mA
mA
/°C
kΩ
ms
µA
µA
µA
µA
µA
%
V
V
V
V
V
V
Ω
V
V
V
5