UCC284-EP - 增强型产品单路输出 LDO、500mA、固定电压 (5V)、低静态电流、宽输入电压范围

UCC284-EP是TI德州仪器公司的一款单通道LDO产品，UCC284-EP是增强型产品单路输出 LDO、500mA、固定电压 (5V)、低静态电流、宽输入电压范围，本站介绍了UCC284-EP的封装应用图解、特点和优点、功能等，并给出了与UCC284-EP相关的TI元器件型号供参考。

UCC284-EP - 增强型产品单路输出 LDO、500mA、固定电压 (5V)、低静态电流、宽输入电压范围 - 单通道LDO - 线性稳压器(LDO) - 德州仪器

产品描述

The UCC284-x family of negative linear-series pass regulators is tailored for low-dropout applications where low-quiescent power is important. Fabricated with a BCDMOS technology ideally suited for low input-to-output differential applications, the UCC284-x passes 0.5 A while requiring only 0.2 V of input-voltage headroom. Dropout voltage decreases linearly with output current, so that dropout at 50 mA is less than 20 mV.

Quiescent current consumption for the device under normal (non-dropout) conditions is typically 200 µA. An integrated charge pump is internally enabled only when the device is operating near dropout with low VIN. This ensured that the device meets the dropout specifications even for maximum load current and a VIN of –3.2 V with only a modest increase in quiescent current. Quiescent current is always less than 360 –A, with the charge pump enabled. The quiescent current of the UCC284 does not increase with load current.

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 40 times the tON delay. The device then begins pulsing on and off at the tON/tOFF duty cycle of 2.5%. This drastically reduces the power dissipation during short circuit such that heat sinking, if at all required, must only accommodate normal operation. An external capacitor sets the on time. The off time is always 40 times tON.

The UCC284-x can be shutdown to 45 µA (maximum) by pulling the SD/CT pin more positive than –0.7 V. To allow for simpler interfacing, the SD/CT pin may be pulled up to 6 V above the ground pin without turning on clamping diodes.

Internal power dissipation is further controlled with thermal-overload protection circuitry. Thermal shutdown occurs if the junction temperature exceeds 140°C. The chip remains off until the temperature has dropped 20°C (TJ = 120°C).

产品特性

Precision Negative Series Pass Voltage Regulation
0.2-V Dropout at 0.5 A
Wide Input Voltage Range –3.2 V to –15 V
Low Quiescent Current Irrespective of Load D Simple Logic Shutdown Interfacing
–5 V, –12 V, and Adjustable Output
2.5% Duty Cycle Short Circuit Protection
SUPPORTS DEFENSE, AEROSPACE AND MEDICAL APPLICATIONS
- Controlled Baseline
- One Assembly/Test Site
- One Fabrication Site
- Available in S-Temp (–55°C/100°C) Temperature Range(1)
- Extended Product Life Cycle
- Extended Product-Change Notification
- Product Traceability

(1) Additional temperature ranges are available – contact factory.

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UCC284-EP - 增强型产品单路输出 LDO、500mA、固定电压 (5V)、低静态电流、宽输入电压 范围

UCC284-EP - 增强型产品单路输出 LDO、500mA、固定电压 (5V)、低静态电流、宽输入电压范围