TL499A

L = 50 µH

SERIES IN1

SW REG IN2

RCL = 500 Ω

OUTPUT

CF = 470 µF

RE1

RE2 = 4.7 kΩ

CP = 0.01 µF

SERIES IN1

SW REG IN2

REF

SW CURRENT

CTRL

OUTPUT

SW IN

GND (PWR)

GND

+

1

3

8

7

6

5

8

1

2

3

4

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TL499A

SLVS029H – JANUARY 1984 – REVISED NOVEMBER 2015

TL499A Wide-Range Power-Supply Controllers

1 Features

3 Description

The TL499A device is an integrated circuit designed

1

•

Internal Series-Pass and Step-Up Switching

to provide a wide range of adjustable regulated

Regulator

supply voltages. The regulated output voltage can be

•

Output Adjustable From 2.9 V to 30 V

varied from 2.9 V to 30 V by adjusting two external

•

1-V to 10-V Input for Switching Regulator

resistors. When the TL499A is ac-coupled to line

power through a step-down transformer, it operates

•

4.5-V to 32-V Input for Series Regulator

as a series DC voltage regulator to maintain the

•

Externally Controlled Switching Current

regulated output voltage. With the addition of a

•

No External Rectifier Required

battery from 1.1 V to 10 V, an inductor, a filter

capacitor, and two resistors, the TL499A operates as

2 Applications

a step-up switching regulator during an AC-line

failure. The adjustable regulated output voltage

•

Voltage Boosting

makes the TL499A useful for a wide range of

•

Dual-Supply Voltage Reglation

applications. Providing backup power during an AC-

line failure makes the TL499A extremely useful in

•

Battery Back-Ups

microprocessor memory applications. The TL499AC

•

Microprocessor Memory Power

is characterized for operation from –20°C to +85°C.

Device Information(1)

PART NUMBER

PACKAGE (PIN)

BODY SIZE (NOM)

SO (8)

6.20 mm × 5.30 mm

TL499A

PDIP (8)

9.81 mm × 6.35 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.