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| 型号： | S-817A29APF-CUSTFU |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.9 V FIXED POSITIVE LDO REGULATOR, 0.51 V DROPOUT, PDSO4 |
| 封装： | HALOGEN FREE NAD LEAD FREE, SNT-4 |
| 文件页数： | 7/53页 |
| 文件大小： | 826K |
| 代理商： | S-817A29APF-CUSTFU |
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SUPER-SMALL PACKAGE CMOS VOLTAGE REGULATOR
Rev.5.0_00
S-817 Series
Seiko Instruments Inc.
15
Operation
1. Basic Operation
Figure 14 shows the block diagram of the S-817 Series.
The error amplifier compares the reference voltage (Vref) with Vfb, which is the output voltage resistance-
divided by feedback resistors Rs and Rf. It supplies the output transistor with the gate voltage necessary
to ensure a certain output voltage free of any fluctuations of input voltage and temperature.
Reference voltage
circuit
VOUT
*1
VSS
VIN
Rs
Rf
Error
amplifier
Current
supply
Vref
+
Vfb
*1. Parasitic diode
Figure 14
2. Output Transistor
The S-817 series uses a P-channel MOS FET as the output transistor.
Be sure that VOUT does not exceed VIN+0.3 V to prevent the voltage regulator from being damaged due to
inverse current flowing from VOUT pin through a parastic diode to VIN pin.
3. Short Circuit Protection
The S-817A series incorporates a short circuit protection to protect the output transistor against short
circuit between VOUT pin and VSS pin. Installation of the short-circuit protection which protects the
output transistor against short-circuit between VOUT and VSS can be selected in the S-817A series. The
short-circuit protection controls output current as shown in the “Typical Characteristics 1.”. Output
Voltage versus Output Current, and suppresses output current at about 40 mA even if VOUT and VSS
pins are short-circuited.
The short-circuit protection can not be a thermal protection at the same time. Attention should be paid to
the Input voltage and the load current under the actual condition so as not to exceed the power
dissipation of the package including the case for short-circuit.
When the output current is large and the difference between input and output voltage is large even if not
shorted, the short-circuit protection may work and the output current is suppressed to the specified value.
For details, refer to “
Characteristics (Typical Data) 3. Maximum Output Current vs. Input
Voltage”.
In addition, S-817B series is removing a short-circuit protection, and is the product which enabled it to
pass large current.
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| S-817A59ANB-CVWT2U | 5.9 V FIXED POSITIVE LDO REGULATOR, 0.23 V DROPOUT, PDSO4 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-817A30ANB-CUT-T2 | 功能描述:低压差稳压器 - LDO 3.0V 1.2uA 2.0% RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| S-817A30ANB-CUTT2G | 功能描述:低压差稳压器 - LDO 3.0V 1.2uA 2.0% RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| S-817A30ANB-CUTT2U | 功能描述:IC REG LINEAR 50MA SC82AB 制造商:ablic u.s.a. inc. 系列:* 包装:剪切带（CT） 零件状态:在售 稳压器数:1 电流 - 输出:50mA 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:SC-82A，SOT-343 供应商器件封装:SC-82AB 标准包装:1 |
| S-817A30APF-CUTTFG | 功能描述:低压差稳压器 - LDO Linear LDO regulator 1.2uA Iq 75mA Iout RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| S-817A30APF-CUTTFU | 功能描述:IC REG LIN 3V 50MA SNT4A 制造商:ablic u.s.a. inc. 系列:- 包装:剪切带（CT） 零件状态:在售 输出配置:正 输出类型:固定 稳压器数:1 电压 - 输入（最大值）:10V 电压 - 输出（最小值/固定）:3V 电压 - 输出（最大值）:- 压降（最大值）:0.41V @ 10mA 电流 - 输出:50mA 电流 - 静态（Iq):2.5μA PSRR:- 控制特性:- 保护功能:短路 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:4-SMD，扁平引线 供应商器件封装:SNT-4A 标准包装:1 |
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