TL499A Datasheet, PDF (1/8 Pages) Texas Instruments – WIDE-RANGE POWER-SUPPLY CONTROLLERS

TL499A
WIDE-RANGE POWER-SUPPLY CONTROLLERS
D Internal Series-Pass and Step-Up Switching
Regulator
D Output Adjustable From 2.9 V to 30 V
D 1-V to 10-V Input for Switching Regulator
D 4.5-V to 32-V Input for Series Regulator
D Externally Controlled Switching Current
D No External Rectifier Required
SLVS029F – JANUARY 1984 – REVISED MAY 2000
P OR PS PACKAGE
(TOP VIEW)
SERIES IN1 1
REF 2
SW REG IN2 3
SW CURRENT CTRL 4
8 OUTPUT
7 GND (PWR)
6 SW IN
5 GND
description
The TL499A 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.
AVAILABLE OPTIONS
TA
PLASTIC DIP
(P)
PLASTIC
SMALL-OUTLINE
(PS)
CHIP FORM
(Y)
–20°C to 85°C TL499ACP
TL499ACPS
TL499AY
The PS package is available taped and reeled. Add the suffix R to device
type (e.g., TL499ACPSR). Chip forms are tested at 25°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright © 2000, Texas Instruments Incorporated
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