TL499A
WIDE-RANGE POWER-SUPPLY CONTROLLERS
SLVS029G – JANUARY 1984 – REVISED SEPTEMBER 2001
D
D
D
D
D
D
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
P OR PS PACKAGE
(TOP VIEW)
SERIES IN1
REF
SW REG IN2
SW CURRENT CTRL
1
2
3
4
8
7
6
5
OUTPUT
GND (PWR)
SW IN
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
–20°C to 85°C
PLASTIC DIP
(P)
TL499ACP
PLASTIC
SMALL-OUTLINE
(PS)
TL499ACPS
The PS package is available taped and reeled. Add the
suffix R to device type (e.g., TL499ACPSR).
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.
Copyright
2001, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
1
TI [ TEXAS INSTRUMENTS ]
