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參數(shù)資料
| 型號： | R3117K283A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封裝： | 1 X 1 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-4 |
| 文件頁數(shù)： | 3/22頁 |
| 文件大?。?/td> | 494K |
| 代理商： | R3117K283A-TR |
R3117xxx3/4
11
Power supply injection order
The R3117xxxxA/C Series supervise the voltage of the SENSE pin. VDD pin and SENSE pin can be used at the
same voltage level. Likewise, VDD pin and SENSE pin can be used at the different voltage level. If the VDD pin and
SENSE pin are used at different voltage level, regarding the start-up sequence, force the voltage level to VDD pin
prior to the SENSE pin. Please note that if the VDD voltage enters the shaded area in the Fig.2 after the power
activation, it may cause the malfunction.
The vertical axis in the Fig.2 shows the fluctuating magnification of VDD.
For example, when VDD is 1.5V with the released state and if VDD increase to 5.25V (3.5 times) within 100ns, it
may cause the malfunction.
If the SENSE pin voltage is equal or more than the released voltage (+VDET), DOUT pin becomes "H". Besides, a
voltage beyond VDD pin is also acceptable to SENSE pin. Concerning the R3117xxxxA series (Nch open drain
output type), DOUT pin must be pulled-up with an external resister.
t
VDD
VOUT
VSENSE
+VDET
1.0
2.0
3.0
4.0
5.0
6.0
0.01
0.1
1
10
100
1000
Input Voltage Rising Time TR (μs)
In
put
V
o
lta
ge
Cha
ngi
ng
Ra
tio
V
IN
H
ig
h
/V
IN
Lo
TR
VIN Lo
VIN High
Operations in this area
may cause malfunction.
VDD
Fig.1
Turn on sequence
Fig.2
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