參數(shù)資料
型號(hào)： S-816A33
廠商： Seiko Instruments Inc.
英文描述： 3.3V±2.0% External Transistor Type Voltage Regulators(輸出電壓3.3V±2.0%，外部晶體管型穩(wěn)壓器)
中文描述： 3.3 ± 2.0％外部晶體管式電壓調(diào)節(jié)器（輸出電壓為3.3V ± 2.0％，外部晶體管型穩(wěn)壓器）
文件頁(yè)數(shù)： 6/21頁(yè)
文件大?。?/td> 200K
代理商： S-816A33
External Transistor Type Voltage Regulators
Rev.3.0
S-816 Series
Seiko Instruments Inc.
5
2. Internal Circuits
2.1 Power-Off Terminal (ON/OFF Terminal)
This terminal activates and deactivates the regulating operation.
When the power-off terminal is set to "L", the VIN voltage appears through the EXT terminal, prodding the external
PNP transistor to off. All the internal circuits stop working, and substantial savings in current consumption are achieved
accordingly. In this condition, the EXT terminal is pulled up to VIN by a pull-up resistance (approx. 0.5M
W
) inside the IC in
order to ensure you power cut off of the external PNP transistor.
The power-off terminal is configured as shown in Figure 5. Since neither pull-up or pull-down is performed internally,
please avoid using the terminal in a floating state. Also, be sure to refrain from applying a voltage of 0.3V to 2.4V to this
terminal lest the current consumption increase. When this power-off terminal is not used, leave it coupled to the V
IN
terminal.
2.2 Overcurrent Protection Circuit
The overcurrent protection function of the S-816 Series monitors the EXT terminal sink current (base current of the
external PNP transistor) with an overcurrent protection circuit incorporated in the IC, and limits that current (EXT terminal
sink current).
As the load current increases, the EXT terminal sink current (base current of the external PNP transistor) also grows
larger to maintain the output voltage. The overcurrent protection circuit clamps and limits the EXT terminal sink current to
the EXT output sink overcurrent set value (Imax) in order to prevent it from increasing beyond that value.
The load current at which the overcurrent protection function works is represented by the following equation:
Iout_max = Imax
′
hfe
In this case, hfe is the DC amplification factor of the external PNP transistor.
Iout_max represents the maximum output current of this regulator. If it is attempted to obtain a higher load current, the
output voltage will fall.
Note that within the overcurrent protection function of this IC, the external PNP transistor may not be able to be
protected from collector overcurrents produced by an EXT-GND short-circuiting or other phenomenon occurring outside
the IC. To protect the external PNP transistor from such collector overcurrents, it will be necessary to choose a transistor
with a larger power dissipation than Iout_max
′
VIN, or to add an external overcurrent protection circuit. With regard to this
external overcurrent protection circuit, please refer to "Application Circuits and Overcurrent Protection Circuit" on page 8.
2.3
Phase Compensation Circuit
The S-816 Series performs phase compensation with a phase compensation circuit, incorporated in the IC, and the
ESR (Equivalent Series Resistance) of an output capacitor, to secure stable operation even in the presence of output load
variation. A uniquely devised phase compensation circuit has resulted in improved transient response characteristics of
the IC, while preserving the same feature of low current consumption. This feature allows the IC to be used in applications
where the input variation or load variation is heavy.
Because the S-816 Series is designed to perform the phase compensation, utilizing the ESR of an output capacitor,
such output capacitor (CL) should always be placed between V
OUT
and V
SS
. Since each capacitor to be employed has an
optimum range of their own characteristics, be sure to choose components for the IC with your all attention. For details,
refer to "Selection of Associated External Components."
Power-Off
Terminal
Internal
Circuit
EXT Terminal
Voltage
V
OUT
Terminal
Voltage
"H"
Activated
VIN-VBE
Set value
"L"
Deactivated
VIN
Hi-z
Figure 5
ON/OFF
V
IN
V
SS
相關(guān)PDF資料
PDF描述
S-816A37 3.7V±2.0% External Transistor Type Voltage Regulators(輸出電壓3.7V±2.0%，外部晶體管型穩(wěn)壓器)
S-816A40 4.0V±2.0% External Transistor Type Voltage Regulators(輸出電壓4.0V±2.0%，外部晶體管型穩(wěn)壓器)
S-816A50 5.0V±2.0% External Transistor Type Voltage Regulators(輸出電壓5.0V±2.0%，外部晶體管型穩(wěn)壓器)
S-817A15 1.5V±2.0% Ultra Compact 3-Pin Positive Voltage Regulator(輸出電壓1.5V±2.0%,緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器)
S-817A20 2.0V±2.0% Ultra Compact 3-Pin Positive Voltage Regulator(輸出電壓2.0V±2.0%,緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S-816A33AMC-BAI-T2 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 1uA 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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-816A33AMC-BAIT2G 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 1uA 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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-816A33AMC-BAIT2U 功能描述:IC REG LINEAR 1A SOT23-5 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:1A 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商器件封裝:SOT-23-5 標(biāo)準(zhǔn)包裝:1
S-816A34AMC-BAI-T2 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 1uA 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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-816A34AMC-BAIT2G 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 1uA 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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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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