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 AC-line failure makes the TL499A extremely useful in microprocessor memory applications. The TL499AC is characterized for operation from –20°C to +85°C.
| Type | Title | Date | |
|---|---|---|---|
| * | Data sheet | TL499A Wide-Range Power-Supply Controllers datasheet (Rev. H) | 30 Nov 2015 |
| Application note | Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) | 12 Mar 2019 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | |
| Application note | Designing Switching Voltage Regulators With the TL499A | 08 Aug 2003 | |
| Application note | Understanding Boost Power Stages In Switchmode Power Supplies | 04 Mar 1999 | |
| Application note | Understanding Buck Power Stages In Switchmode Power Supplies | 04 Mar 1999 |
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| Package | Pins | Download |
|---|---|---|
| PDIP (P) | 8 | View options |
| SO (PS) | 8 | View options |
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