RH5RH
• RH5RH303B
Symbol
VOUT=3.0V
Item
Output Voltage
Input Voltage
Start-up Voltage
Hold-on Voltage
Efficiency
Conditions
MIN.
TYP.
MAX.
Unit
V
Note
VOUT
VIN
2.925 3.000 3.075
8
V
→
Vstart
Vhold
η
IOUT=1mA,VIN : 0 2V
0.8
0.9
V
→
IOUT=1mA,VIN : 2 0V
0.7
70
V
85
30
%
IDD1
IDD2
Supply Current 1
To be measured at OUT pin
50
5
µA
To be measured at OUT pin
VIN=3.5V
2
µA
Supply Current 2
ILX
Lx Switching Current
Lx Leakage Current
EXT “H” Output Current
EXT “L” Output Current
CE “H” Level 1
VLX=0.4V
VLX=6V,VIN=3.5V
VEXT=VOUT–0.4V
VEXT=0.4V
60
mA
µA
mA
mA
V
0.5
ILXleak
IEXTH
IEXTL
VCEH1
VCEL1
VCEH2
VCEL2
ICEH
–1.5
1.5
VOUT≥1.5V
VOUT–0.4
CE “L” Level 1
VOUT≥1.5V
0.4
V
CE “H” Level 2
0.8V≤VOUT<1.5V
0.8V≤VOUT<1.5V
CE=3V
V
OUT–0.1
V
CE “L” Level 2
0.1
0.5
V
CE “H” Input Current
CE “L” Input Current
Oscillator Frequency
µA
µA
kHz
ICEL
CE=0V
–0.5
80
fosc
100
80
120
90
Oscillator Maximum Duty
Cycle
Maxdty
on (VLX “L” )side
70
%
Time required for the rising
of VOUT up to 3V.
0.5
2.0
0.8
ms
V
Note1
Note2
tstart
Soft-Start Time
VLXlim
VLX Voltage Limit
Lx Switch ON
0.65
1.0
Unless otherwise provided, VIN=1.8V, VSS=0V, IOUT=10mA, Topt=25˚C, and use External Circuit of Typical
Application (FIG. 3).
(Note 1) Soft-Start Circuit is operated in the following sequence :
(1) VIN is applied.
(2) The voltage (Vref) of the reference voltage unit is maintained at 0V for about 200µs after the application of VIN.
(3) The output of Error Amp. is raised to “H” level during the maintenance of the voltage (Vref) of the reference voltage unit.
(4) After the rise of Vref, the output of Internal Error Amp. is gradually decreased to an appropriate value by the function of Internal Phase Com
pensation Circuit, and the Output Voltage is gradually increased in accordance with the gradual decrease of the output of Internal Error Amp.
(Note 2) ILX is gradually increased after Lx Switch is turned ON. In accordance with the increase of ILX, VLX is also increased. When VLX reaches VLXlim,
Lx Switch is turned OFF by an Lx Switch Protection Circuit.
8
RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
