R1218N021A Datasheet, PDF (5/21 Pages) RICOH electronics devices division – Step-up DC/DC converter for White LED Backlight

R1218x
ELECTRICAL CHARACTERISTICS
• R1218xxxxA
Symbol
Item
VIN Operating Input Voltage
IDD Supply Current
Istandby Standby Current
VUVLO1 UVLO Detector Threshold
Conditions
VIN=5.5V, VFB=0V, Lx at no load
VIN=5.5V, VCE=0V
VIN falling
Min.
1.8
1.5
VUVLO2 UVLO Released Voltage
VIN rising
VCEH
VCEL
RCE
tshtdn
VFB
∆VFB/
∆Topt
IFB
RON
CE Input Voltage "H"
CE Input Voltage "L"
CE Pull Down Resistance
CE Shutdown Delay Time
VFB Voltage
VFB Voltage Temperature
Coefficient
VFB Input Current
Switch On Resistance
ILXleak Switch Leakage Current
ILXlim Switch Current Limit
Vf
Diode Forward Voltage
IDIODEleak Diode Leakage Current
fosc Oscillator Frequency
Maxduty Maximum Duty Cycle
VOVP1 OVP Detector Threshold
VIN=5.5V
VIN=1.8V
VIN=3.6V
VIN=3.6V
VIN=3.6V
1.5
600
0.19
VIN=3.6V, −40°C ^<= Topt ^<= 85°C
VIN=5.5V, VFB=0V or 5.5V
VIN=3.6V, ISW=100mA
R1218xxx1A VLX=20V
R1218xxx2A VLX=29V
VIN=3.6V
R1218xxx1A IDIODE=100mA
R1218xxx1A VOUT=20V, VLX=0V
VIN=3.6V, VOUT=VFB=0V
VIN=3.6V, VOUT=VFB=0V
R1218x021A
VIN=3.6V,
VOUT rising
R1218x031A
R1218x041A
R1218x052A
R1218x062A
−0.1
400
1.0
86
8.5
13.0
17.0
21.5
26.0
R1218x021A
VOVP2 OVP Released Voltage
VIN=3.6V,
VOUT falling
R1218x031A
R1218x041A
R1218x052A
R1218x062A
Typ.
0.5
0
1.6
VUVLO1
+0.1
1200
10
0.20
±150
1.5
0
0
700
0.8
10
1.2
91
9.5
14.0
18.5
23.0
27.5
VOVP1
−0.5
VOVP1
−0.75
VOVP1
−1.0
VOVP1
−1.25
VOVP1
−1.5
Topt=25°C
Max. Unit
5.5 V
1.0 mA
3.0 µA
1.7 V
1.8 V
0.5
2200
0.21
0.1
3.0
3.0
1000
1.4
10.5
15.0
20.0
24.5
29.0
V
V
kΩ
ms
V
ppm
/°C
µA
Ω
µA
µA
mA
V
µA
MHz
%
V
V
5