參數(shù)資料
型號(hào)： S-8261ACAMD-G4AT2G
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6
封裝： LEAD FREE, SOT-23, 6 PIN
文件頁數(shù)： 17/33頁
文件大?。?/td> 384K
代理商： S-8261ACAMD-G4AT2G
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-8261 Series
Rev.5.0_00
Seiko Instruments Inc.
24
Battery Protection IC Connection Example
R1 : 470
Ω
Battery C1 :
0.1
μF
VSS
DO
VDD
CO
VM
S-8261 Series
FET1
FET2
EB
EB
+
R2 : 2 k
Ω
DP
Figure 10
Table 17 Constant for External Components
Symbol
Part
Purpose
Typ.
Min.
Max.
Remarks
FET1
N-channel
MOS FET
Discharge control
Threshold voltage
≤ Overdischarge detection voltage*1
Gate to source withstanding voltage
≥ Charger voltage*2
FET2
N-channel
MOS FET
Charge control
Threshold voltage
≤ Overdischarge detection voltage*1
Gate to source withstanding voltage
≥ Charger voltage*2
R1
Resistor
ESD protection,
For power fluctuation
470
Ω
300
Ω
1 k
Ω
Resistance should be as small as possible to avoid lowering of
the overcharge detection accuracy caused by VDD pin current.
*3
C1
Capacitor
For power fluctuation
0.1
μF
0.022
μF
1.0
μF
Install a capacitor of 0.022
μF or higher between VDD and
VSS.
*4
R2
Resistor
Protection for reverse
connection of a charger
2 k
Ω
300
Ω
4 k
Ω
Select a resistance as large as possible to prevent large current
when a charger is connected in reverse.
*5
*1. If the threshold voltage of an FET is low, the FET may not cut the charging current.
If an FET with a threshold voltage equal to or higher than the overdischarge detection voltage is used, discharging
may be stopped before overdischarge is detected.
**2.
If the withstanding voltage between the gate and source is lower than the charger voltage, the FET may be destroyed.
*3. If R1 has a high resistance, the voltage between VDD and VSS may exceed the absolute maximum rating when a
charger is connected in reverse since the current flows from the charger to the IC. Insert a resistor of 300
Ω or higher
to R1 for ESD protection.
*4. If a capacitor of less than 0.022
μF is connected to C1, DO may oscillate when load short-circuiting is detected. Be
sure to connect a capacitor of 0.022
μF or higher to C1.
*5. If R2 has a resistance higher than 4 k
Ω, the charging current may not be cut when a high-voltage charger is
connected.
Caution 1. The above constants may be changed without notice.
2. The DP pin should be open.
3. It has not been confirmed whether the operation is normal or not in circuits other than the above
example of connection. In addition, the example of connection shown above and the constant do not
guarantee proper operation.
Perform through evaluation using the actual application to set the
constant.
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