TL499A Datasheet | Texas Instruments

Product Folder Sample & Buy Technical Documents Tools & Software Support & munity SLVS029H - JANUARY 1984 - REVISED NOVEMBER 2015 TL499A Wide-Range Power-Supply Controllers 1 Features - 1 Internal Series-Pass and Step-Up Switching Regulator - Output Adjustable From 2.9 V to 30 V - 1-V to 10-V Input for Switching Regulator - 4.5-V to 32-V Input for Series Regulator - Externally Controlled Switching Current - No External Rectifier Required 2 Applications - Voltage Boosting - Dual-Supply Voltage Reglation - Battery Back-Ups - Microprocessor Memory Power 3 Description The TL499A device is an integrated circuit designed to provide a wide range of adjustable regulated supply voltages. The regulated output voltage can be varied from 2.9 V to 30 V by adjusting two external resistors. When the TL499A is ac-coupled to line power through a step-down transformer, it operates as a series DC voltage regulator to maintain the regulated output voltage. With the addition of a battery from 1.1 V to 10 V, an inductor, a filter capacitor, and two resistors, the TL499A operates as a step-up switching regulator during an AC-line failure. The adjustable regulated output voltage makes the TL499A useful for a wide range of applications. Providing backup power during an ACline failure makes the TL499A extremely useful in microprocessor memory applications. The TL499AC is characterized for operation from - 20°C to +85°C. Device Information(1) PART NUMBER PACKAGE (PIN) BODY SIZE (NOM) SO (8) PDIP (8) 6.20 mm × 5.30 mm 9.81 mm × 6.35 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical...