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參數(shù)資料
| 型號(hào)： | RH5RH451B-T2 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PSSO3 |
| 封裝： | SOT-89, 3 PIN |
| 文件頁數(shù)： | 2/29頁 |
| 文件大?。?/td> | 199K |
| 代理商： | RH5RH451B-T2 |
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9
RH5RH503B
VOUT=5.0V
RH5RH
Unless otherwise provided, VIN=3V, VSS=0V, IOUT=10mA, Topt=25C, 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 200s 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.
Symbol
Item
VOUT
Output Voltage
VIN
Input Voltage
Vstart
Start-up Voltage
Vhold
Hold-on Voltage
η
Efficiency
IDD1
Supply Current 1
IDD2
Supply Current 2
ILX
Lx Switching Current
ILXleak
Lx Leakage Current
IEXTH
EXT “H” Output Current
IEXTL
EXT “L” Output Current
VCEH1
CE “H” Level 1
VCEL1
CE “L” Level 1
VCEH2
CE “H” Level 2
VCEL2
CE “L” Level 2
ICEH
CE “H” Input Current
ICEL
CE “L” Input Current
fosc
Oscillator Frequency
Maxdty
Oscillator Maximum Duty
Cycle
tstart
Soft-Start Time
VLXlim
VLX Voltage Limit
Conditions
MIN.
TYP.
MAX.
Unit
Note
4.875
5.000
5.125
V
8V
IOUT=1mA,VIN : 0
→2V
0.8
0.9
V
IOUT=1mA,VIN : 2
→0V
0.7
V
70
85
%
To be measured at OUT pin
60
90
A
To be measured at OUT pin
25
A
VIN=5.5V
VLX=0.4V
80
mA
VLX=6V,VIN=5.5V
0.5
A
VEXT=VOUT–0.4V
–2.0
mA
VEXT=0.4V
2.0
mA
VOUT
≥1.5V
VOUT–0.4
V
VOUT
≥1.5V
0.4
V
0.8V
≤VOUT<1.5V
VOUT–0.1
V
0.8V
≤VOUT<1.5V
0.1
V
CE=5V
0.5
A
CE=0V
–0.5
A
80
100
120
kHz
on (VLX “L” )side
70
80
90
%
Time required for the rising
0.5
2.0
ms
Note1
of VOUT up to 5V.
Lx Switch ON
0.65
0.8
1.0
V
Note2
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