UCC281_TI 具有 -40°C 至 +85°C 工作温度范围和反向电流保护功能的 1A、低压降稳压器

UCC281的基本参数

制造厂商：TI
产品类别：电源管理
技术类目：线性和低压降 (LDO) 稳压器
功能描述：具有 -40°C 至 +85°C 工作温度范围和反向电流保护功能的 1A、低压降稳压器
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UCC281的产品详情：

The UCC381-3/-5/-ADJ family of positive linear series pass regulators is tailored for low drop out applications where low quiescent power is important. Fabricated with a BiCMOS technology ideally suited for low input to output differential applications, the UCC381 will pass 1A while requiring only 0.5V of input voltage headroom. Dropout voltage decreases linearly with output current, so that dropout at 200mA is less than 100mV. Quiescent current is always less than 650uA. To prevent reverse current conduction, on-chip circuitry limits the minimum forward voltage to typically 50mV. Once the forward voltage limit is reached, the input-output differential voltage is maintained as the input voltage drops until undervoltage lockout disables the regulator.

UCC381-3 and UCC381-5 versions have on-chip resistor networks preset to regulate either 3.3V or 5.0V, respectively. Furthermore, remote sensing of the load voltage is possible by connecting the VOUTS pin directly at the load. The output voltage is then regulated to 1.5% at room temperature and better than 2.5% over temperature. The UCC381-ADJ version has a regulated output voltage programmed by an external user-definable resistor ratio.

Short circuit current is internally limited. The device responds to a sustained overcurrent condition by turning off after a T_ON delay. The device then stays off for a period, T_OFF, that is 32 times the T_ON delay. The device then begins pulsing on and off at the T_ON/(T_ON +T_OFF) duty cycle of 3%. This drastically reduces the power dissipation during short circuit such that heat sinking, if at all required, must only accommodate normal operation. On the fixed output versions of the device TON is fixed at 400us - a guaranteed minimum. On the adjustable version an external capacitor sets the on time. The off time is always 32 times T_ON.

The UCC381 can be shutdown to 25uA (max) by pulling the CT pin low.

Internal power dissipation is further controlled with thermal overload protection circuitry. Thermal shutdown occurs if the junction temperature exceeds 165°C. The chip will remain off until the temperature has dropped 20°C.

The UCC281 series is specified for operation over the industrial range of -40°C to +85°C, and the UCC381 series is specified from 0°C to +70°C. These devices are available in the 8 pin DP surface mount power package. For other packaging options consult the factory.

UCC281的优势和特性：

Precision Positive Linear Voltage Regulation
0.5V Dropout at 1A
Guaranteed Reverse Input/ Output Voltage Isolation with Low Leakage
Low Quiescent Current Irrespective of Load
Adjustable Output Voltage Version
Fixed Versions for 3.3V and 5V Outputs
Logic Shutdown Capability
Short Circuit Power Limit of 3% \x95 VIN \x95 Current Limit
Remote Load Voltage for Accurate Load Regulation

UCC281的参数（英文）：

Output options
Adjustable Output, Fixed Output
Iout (Max) (A)
1
Vin (Max) (V)
9
Vin (Min) (V)
1.8
Vout (Max) (V)
8.8
Vout (Min) (V)
1.2
Fixed output options (V)
5
Iq (Typ) (mA)
0.4
Thermal resistance θJA (°C/W)
70
Rating
Catalog
Load capacitance (Min) (μF)
1
Regulated outputs (#)
1
Features
Reverse current protection
Accuracy (%)
2.5
PSRR @ 100 KHz (dB)
22
Dropout voltage (Vdo) (Typ) (mV)
500
Operating temperature range (C)
0 to 70

UCC281具体的完整产品型号参数及价格（美元）：

UCC281的完整型号有：UCC281DP-5、UCC281DP-ADJ，以下是这些产品的关键参数及官网采购报价：

UCC281DP-5，工作温度：0 to 70，封装：SOIC (D)-8，包装数量MPQ：75个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UCC281DP-5的批量USD价格：2.134（1000+）

UCC281DP-ADJ，工作温度：0 to 70，封装：SOIC (D)-8，包装数量MPQ：75个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UCC281DP-ADJ的批量USD价格：2.134（1000+）

UCC281的评估套件：

UCC281的电路图解：

UCC281的评估套件：