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參數(shù)資料
| 型號： | S-817A22ANB-CUL-T2 |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 2.2 V FIXED POSITIVE LDO REGULATOR, 0.67 V DROPOUT, PDSO4 |
| 封裝： | SC-82AB, 4 PIN |
| 文件頁數(shù)： | 7/50頁 |
| 文件大小： | 882K |
| 代理商： | S-817A22ANB-CUL-T2 |
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SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
Rev.3.0_00
S-817 Series
Seiko Instruments Inc.
15
Selection of Output Capacitor (CL)
To stabilize operation against variation in output load, a capacitor (CL) must be mounted between VOUT
and VSS in the S-817 series because the phase is compensated with the help of the internal phase
compensation circuit and the ESR of the output capacitor.
When selecting a ceramic or an OS capacitor, capacitance should be 0.1
F or more, and when selecting a
tantalum or an aluminum electrolytic capacitor, capacitance should be 0.1
F or more and ESR 30 or
less.
When an aluminum electrolytic capacitor is used attention should be especially paid to since the ESR of the
aluminum electrolytic capacitor increases at low temperature and possibility of oscillation becomes large.
Sufficient evaluation including temperature characteristics is indispensable.
Overshoot and undershoot
characteristics differ depending upon the type of the output capacitor.
Refer to CL dependencies in “
Reference Data 1. Transient Response Characteristics”.
Application Circuits
1. Output Current Boosting Circuit
R2
R1
Tr1
GND
VOUT
VIN
VSS
VIN
VOUT
CL
S-817
series
CIN
Figure 14
As shown in Figure 14, the output current can be boosted by externally attaching a PNP transistor. The
base current of the PNP transistor is controlled so that output voltage (VOUT) goes the voltage specified
in the S-817 Series when base-emitter voltage (VBE) necessary to turn on the PNP transistor is obtained
between input voltage (VIN) and S-817 Series power source pin (VIN).
The following are tips and hints for selecting and ensuring optimum use of external parts
PNP transistor (Tr1):
1. Set hFE to approx. 100 to 400.
2. Confirm that no problem occurs due to power dissipation under normal operation conditions.
Resistor (R1):
Generally set R1 to 1 k
÷ VOUT (S) (the voltage specified in the S-817 Series) or more.
Output capacitor (CL):
Output capacitor (CL) is effective in minimizing output fluctuation at powering on or due to power
or load fluctuation, but oscillation might occur. Always connect resistor R2 in series to output
capacitor CL.
Resistor (R2): Set R2 to 2 × VOUT(S) or more.
DO NOT attach a capacitor between the S-817 Series power source (VIN) and GND pins or
between base and emitter of the PNP transistor to avoid oscillation.
To improve transient response characteristics of the output current boosting circuit shown in
Figure 14, check that no problem occurs due to output fluctuation at powering on or due to
power or load fluctuation under normal operating conditions.
Pay attention to the short current limit circuit incorporated into the S-817 Series because it does
not function as a shortcircuiting protection circuit for this boosting circuit.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-817A22ANB-CULT2G | 功能描述:低壓差穩(wěn)壓器 - LDO 2.2V 1.2uA 2.0% RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| S-817A22ANB-CULT2U | 功能描述:IC REG LINEAR 35MA SC82AB 制造商:ablic u.s.a. inc. 系列:* 包裝:剪切帶（CT） 零件狀態(tài):在售 穩(wěn)壓器數(shù):1 電流 - 輸出:35mA 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:SC-82A，SOT-343 供應(yīng)商器件封裝:SC-82AB 標(biāo)準(zhǔn)包裝:1 |
| S-817A22APF-CULTFG | 功能描述:低壓差穩(wěn)壓器 - LDO Linear LDO regulator 1.2uA Iq 75mA Iout RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| S-817A23ANB-CUM-T2 | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR |
| S-817A23ANB-CUMT2G | 功能描述:低壓差穩(wěn)壓器 - LDO Linear LDO regulator 1.2uA Iq 75mA Iout RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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