The UCC283–3/–5/–ADJ family of positive linear series pass voltage regulators are 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 UCC283–5 passes 3 A while requiring only 0.45 V of typical input voltage headroom (ensured 0.6-V dropout).

These regulators include reverse voltage sensing that prevents current in the reverse direction. Quiescent current is always less than 650 µA. These devices have been internally compensated in such a way that the need for a minimum output capacitor has been eliminated.

UCC283–3 and UCC283–5 versions are in 3-lead packages and have preset outputs at 3.3 V and 5.0 V respectively. The output voltage is regulated to 1.5% at room temperature. The UCC283–ADJ version, in a 5-lead package, regulates the output voltage programmed by an external resistor ratio.

Short-circuit current is internally limited. The device responds to a sustained overcurrent condition by turning off after a tON time 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 and means heat sinks need only accommodate normal operation. On the 3-leaded versions of the device tON is fixed at 750 µs, on the adjustable 5-leaded versions an external capacitor sets the on time. The off time is always 32 × tON. The external timing control pin, CT, on the 5-leaded versions also serves as a shutdown input when pulled low.

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

The UCC283 series is specified for operation over the industrial range of –40°C to 85°C, and the UCC383 series is specified from 0°C to 70°C. These devices are available in 3- and 5-pin TO–220 and TO–263 power packages.

• Precision Positive Linear Series Pass Voltage Regulation
• 0.45 V Dropout at 3 A
• 50 mV Dropout at 10 mA
• Quiescent Current Under 650 µA Irrespective of Load
• Adjustable (5-Lead) Output Voltage Version
• Fixed (3-Lead) Versions for 3.3-V and 5-V Outputs
• Logic Shutdown Capability
• Short-Circuit Power Limit of (3% × VIN × ISHORT)
• Low VOUT to VIN Reverse Leakage
• Thermal Shutdown

All trademarks are the property of their respective owners.

• TRF37D73 - 具有断电引脚的 40 至 4000 MHz 20dB RF 增益块
• TLC5957 - 具有预充电 FET、LED 开路检测和 Caterpillar Cancelling 的 48 通道、16 位 ES-PWM LED 驱动器
• BQ24350 - 具有 FET、6.17 输入 OVP 的过压和过流充电器前端保护 IC
• MSP430F6723A - MSP430F673xA、MSP430F672xA 混合信号微控制器
• CD40103B-MIL - CMOS 8 级可预置 8 位二进制同步递减计数器
• MSP430FR68721 - MSP430FR687x、MSP430FR682x 、MSP430FR587x 混合信号微控制器
• MSP430F6748A - MSP430F677xA、MSP430F676xA 、MSP430F674xA 混合信号微控制器
• UCC39002 - 高级 8 引脚负载共享控制器
• TL16C754C - 具有 64 字节 FIFO 的四路 UART
• UCC27425-Q1 - 具有使能端的汽车类双路 4A MOSFET 驱动器