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Product details

Parameters

Vin (Min) (V) 1.1 Vin (Max) (V) 10 Vout (Min) (V) 2.9 Vout (Max) (V) 30 Switch current limit (Typ) (A) 0.5 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 0.8 Features Adjustable Current Limit Duty cycle (Max) (%) 70 Operating temperature range (C) -20 to 85 Rating Catalog open-in-new Find other Boost converters (integrated switch)

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOP (PS) 8 48 mm² 6.2 x 7.8 open-in-new Find other Boost converters (integrated switch)

Features

  • 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
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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 AC-line failure makes the TL499A extremely useful in microprocessor memory applications. The TL499AC is characterized for operation from –20°C to +85°C.

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Technical documentation

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Type Title Date
* Datasheet TL499A Wide-Range Power-Supply Controllers datasheet (Rev. H) Nov. 30, 2015
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) Mar. 12, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Designing Switching Voltage Regulators With the TL499A Aug. 08, 2003
Application note Understanding Boost Power Stages In Switchmode Power Supplies Mar. 04, 1999
Application note Understanding Buck Power Stages In Switchmode Power Supplies Mar. 04, 1999

Design & development

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CAD/CAE symbols

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PDIP (P) 8 View options
SO (PS) 8 View options

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