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參數(shù)資料
| 型號： | AS8863M5-1.8 |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 1.8 V FIXED POSITIVE LDO REGULATOR, 0.26 V DROPOUT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 165K |
| 代理商： | AS8863M5-1.8 |
Rev. 10/6/00
V
OUT
GND
AS8863
Top View
EN
BYP
(Optn)
V
IN
+
Fig. 1
Hi-ON
Lo-OFF
3
2
1
4
5
AS8863
Application Hints
The AS8863 requires an output capacitor for device stability.
The value required varies greatly depending upon the
application circuit and other factors.
The high frequency
characteristics of electrolytic capacitors depend greatly on the
type and also on the manufacturer. Sometimes bench testing is
the only means to determine the proper capacitor type and
value. The high quality 2.2
F aluminum electrolytic capacitor
covers all general application circuits, this stability can be
obtained with a tantalum electrolytic value of 1
F.
In general, linear regulator stability decreases with higher
output currents. In some applications the AS8863 may
operate at few milliamps. In these applications the output
capacitance can be further reduced. For example, when the
regulator is running at 10mA output current the output
capacitance value is half compared to the same regulator
that is running at 150mA.
With the AS8863 adjustable regulator, the minimum value
of output capacitance is a function of the output voltage.
The value decreases with higher output voltages, since the
closed loop gain is increased.
Typical Applications Circuits
The AS8863 provides access to the internal reference. A 10
F capacitor on the BYP pin will provide a significant reduction in output
noise. This pin may be left unconnected if the output noise is not a major concern. The AS8863 start-up speed is inversely
proportional to the size of its capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of
CBYP. If the rapid turn-ON is necessary, omit bypass capacitor.
Figure 1 shows AS8863 standard application circuit. The EN (enable) pin is pulled high (>2.0V) to enable the regulator. To disable
the regulator, EN < 0.6V.
The AS8863 in figure 2 shows adjustable output voltage configuration. Two resistors set the output voltage. The formula for output
voltage is:
VOUT = 1.235V x (1+ R1)
Resistor values are not critical as the Adj. pin has high input impedance, for best results use resistors of 47k
or less. A capacitor for
Adj to ground will provide improved noise performance.
R2
V
IN
V
OUT
GND
Top View
EN
Byp
(Optn)
+
ADJ
R1
R2
Fig. 2
Hi-ON
Lo-OFF
AS8863
1
2
34
5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AS8863M5-2.5 | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.26 V DROPOUT, PDSO5 |
| AS8863M5-2.8 | 2.8 V FIXED POSITIVE LDO REGULATOR, 0.26 V DROPOUT, PDSO5 |
| AS8863M5-3.0 | 3 V FIXED POSITIVE LDO REGULATOR, 0.26 V DROPOUT, PDSO5 |
| AS8863M5-3.3 | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.26 V DROPOUT, PDSO5 |
| AS8863M5-4.5 | 4.5 V FIXED POSITIVE LDO REGULATOR, 0.26 V DROPOUT, PDSO5 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS8867-01 | 制造商:QP Semiconductor 功能描述:100325/M NSC DIE - FP |
| AS888 | 制造商:Coilcraft Inc 功能描述:DSL transformer, CO driver transformer, SMT, not RoHS |
| AS8886- | 制造商:Coilcraft Inc 功能描述:DSL transformer, CO driver transformer, SMT, not RoHS |
| AS8886-B | 制造商:Coilcraft Inc 功能描述:DSL transformer, CO driver transformer, SMT, not RoHS |
| AS89000 | 功能描述:4 CHANNEL AMPLIFIER 制造商:ams 系列:- 零件狀態(tài):在售 放大器類型:模擬輸出 輸出類型:模擬 安裝類型:表面貼裝 標準包裝:100 |
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