UCC281-ADJ - 单输出 LDO、1.0A、可调节电压（1.22 至 8.85V）、低静态电流

UCC281-ADJ是TI德州仪器公司的一款单通道LDO产品，UCC281-ADJ是单输出 LDO、1.0A、可调节电压（1.22 至 8.85V）、低静态电流，本站介绍了UCC281-ADJ的封装应用图解、特点和优点、功能等，并给出了与UCC281-ADJ相关的TI元器件型号供参考。

UCC281-ADJ - 单输出 LDO、1.0A、可调节电压（1.22 至 8.85V）、低静态电流 - 单通道LDO - 线性稳压器(LDO) - 德州仪器

产品描述

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 TON delay. The device then stays off for a period, TOFF, that is 32 times the TON delay. The device then begins pulsing on and off at the TON/(TON +TOFF) 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 TON.

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.

产品特性

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

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