SG29085 Microsemi Corporation, SG29085 Datasheet

SG29085

Manufacturer Part Number

SG29085

Description

LOW DROPOUT DUAL REGULATOR

Manufacturer

Microsemi Corporation

Datasheet

1.SG29085.pdf (4 pages)

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Download datasheet (42Kb)

12/90 Rev 1.1 2/94

DESCRIPTION

The SG29085/85A is a dual 8.2V/5V positive voltage regulator. One output is a high

current (up to 1000 mA) regulator that can be turned on or off by a high impedance low

current TTL compatible switch. The second or standby output remains on regardless.

The on/off switch not only shuts off the high current output but actually puts the IC in a

micropower mode making possible a low quiescent current. This unique characteristic

coupled with an extremely low dropout, (.55V for output current of 10mA) makes the

SG29085/85A well suited for power systems that require standby memory.

SG29085/85A includes other features which were originally designed for automotive

applications. These include protection from reverse battery installations and double

battery jumps. The high current regulator has overvoltage shutdown to protect both the

internal circuitry and the load during line transients, such as load dump (60V). In addition,

the high current regulator design also has built-in protection for short circuit and thermal

overload. During these fault conditions of the primary regulator the standby regulator will

continue to power its load.

The SG29085 is the 8.2 volt, ±5% version of a family of dual regulators with a standby

output voltage of 5V. Other high current outputs of 5 and 12 volts are available. Also

available is the SG28085A which offers an improved output voltage tolerance of ±2%.

They are available in the plastic TO-220 power package and are designed to function

over the automotive ambient temperature range of -40 C to 85 C.

TYPICAL APPLICATION CIRCUIT

(for output voltage only)

1994

ON/OFF SWITCH

0.1 F

INPUT VOLTAGE

OVERVOLTAGE

SHUTDOWN

THERMAL

SG29085/85A

LOW DROPOUT DUAL REGULATOR

5V STANDBY

REGULATOR

REFERENCE

GROUND

1.23V

BIAS

5.6V

* Required if regulator is located far from power

** Required for stability. May be increased without

The

supply filter.

bound. Capacitor must be rated to operate at the

minimum temperature expected for the regulator

system.

FEATURES

2% Internally Trimmed Output

Two regulated outputs

Output current in excess of

1000mA

Low quiescent current standby

regulator

Input-output differential less than

0.6V at 0.5A

60V load dump protection

Short circuit protection

Internal thermal overload protec-

tion

Available in plastic TO-220

ON/OFF switch for high current

output

Reverse battery protection

-50V reverse transient protection

11861 Western Avenue

10 F

INFINITY Microelectronics Inc.

(714) 898-8121

SG29085/85A

OUTPUT VOLTAGE

STANDBY OUTPUT

(8.2V, 1000mA)

(5V, 50mA)

Garden Grove, CA 92841

FAX: (714) 893-2570

Related parts for SG29085

SG29085 Summary of contents

Page 1

... During these fault conditions of the primary regulator the standby regulator will continue to power its load. The SG29085 is the 8.2 volt, ±5% version of a family of dual regulators with a standby output voltage of 5V. Other high current outputs of 5 and 12 volts are available. Also available is the SG28085A which offers an improved output voltage tolerance of ± ...

Page 2

... Output Capacitor with ESR ....... 60V max OUT 0.1 F min. Operating Ambient Temperature Range - (T SG29085/85A ................................................. = 10mA. OUT (Unless otherwise specified, these specifications apply for the operating ambient temperature of T and are for DC characteristics only. Low duty cycle pulse testing techniques are used which SB Test Conditions 9V ...

Page 3

... ON APPLICATION NOTES The advantages of using a low-dropout regulator such as the SG29085/85A are the need for less “headroom” for full regula- tion, and the inherent reverse polarity protection provided by the PNP output device. A typical NPN regulator design requires an input to output differential of approximately two volts minimum. ...

Page 4

... Tantalum capacitors satisfy this requirement. STANDBY OUTPUT The SG29085/85A differs from most fixed voltage regulators in that it is equipped with two regulator outputs instead of one. The additional output is intended for use in systems requiring standby memory circuits ...

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