Greater Tulsa Area Classifieds Moderated Newsgroup > Sand Springs
> UCC283 ldo regulator 3A adjustable 1.2-8.5V TO220 (X10
UCC283 ldo regulator 3A adjustable 1.2-8.5V TO220 (X10
3A Low Dropout Voltage Rgulator
* Precision Positive Linear Series Pass Voltage Regulation
* 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
* Short-Circuit Power Limit of (3% × VIN × ISHORT)
* Low VOUT to VIN Reverse Leakage
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.
US: $3.75 Canada: $4.50 International: $5.50 Lowest cost option.
2-nd item: S&H 75% less than first (or 25% of first)
items 3-5: S&H 80% less than first (or 20% of first)
items 6-10: S&H 90% less than first (or 10% of first)
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