RH5RH301A Datasheet, PDF (10/29 Pages) RICOH electronics devices division – PWM STEP-UP DC/DC CONVERTER

RH5RH
• RH5RH503B
Symbol
VOUT
VIN
Vstart
Vhold
η
IDD1
Item
Output Voltage
Input Voltage
Start-up Voltage
Hold-on Voltage
Efficiency
Supply Current 1
IDD2
Supply Current 2
ILX
ILXleak
IEXTH
IEXTL
VCEH1
VCEL1
VCEH2
VCEL2
ICEH
ICEL
fosc
Maxdty
Lx Switching Current
Lx Leakage Current
EXT “H” Output Current
EXT “L” Output Current
CE “H” Level 1
CE “L” Level 1
CE “H” Level 2
CE “L” Level 2
CE “H” Input Current
CE “L” Input Current
Oscillator Frequency
Oscillator Maximum Duty
Cycle
tstart
Soft-Start Time
VLXlim
VLX Voltage Limit
Conditions
MIN. TYP. MAX.
4.875 5.000 5.125
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IOUT=1mA,VIN : 0→2V
IOUT=1mA,VIN : 2→0V
0.8 0.9
0.7
70 85
To be measured at OUT pin
60
90
VOUT=5.0V
Unit Note
V
V
V
V
%
µA
To be measured at OUT pin
VIN=5.5V
2
5
µA
VLX=0.4V
VLX=6V,VIN=5.5V
VEXT=VOUT–0.4V
VEXT=0.4V
VOUT≥1.5V
VOUT≥1.5V
0.8V≤VOUT<1.5V
0.8V≤VOUT<1.5V
CE=5V
CE=0V
80
mA
0.5 µA
–2.0 mA
2.0
mA
VOUT–0.4
V
0.4
V
VOUT–0.1
V
0.1
V
0.5 µA
–0.5
µA
80 100 120 kHz
on (VLX “L” )side
70 80
90
%
Time required for the rising _{0.5 2.0}
of VOUT up to 5V.
ms Note1
Lx Switch ON
0.65 0.8 1.0
V Note2
Unless otherwise provided, VIN=3V, 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.
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