SG29085AP Microsemi Corporation, SG29085AP Datasheet

SG29085AP

Manufacturer Part Number

SG29085AP

Description

Low Dropout Dual Regulator

Manufacturer

Microsemi Corporation

Datasheet

1.SG29085AP.pdf (4 pages)

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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)

ON/OFF SWITCH

1994

0.1 F

INPUT VOLTAGE

OVERVOLTAGE

SHUTDOWN

THERMAL

SG29085/85A

LOW DROPOUT DUAL REGULATOR

REGULATOR

REFERENCE

5V STANDBY

REGULATOR

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

regulator

Input-output differential less than

0.6V at 0.5A

60V load dump protection

Short circuit protection

tion

ON/OFF switch for high current

output

Low quiescent current standby

Reverse battery protection

-50V reverse transient protection

Internal thermal overload protec-

Available in plastic TO-220

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

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SG29085AP Summary of contents

Page 1

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 ...

Page 2

ABSOLUTE MAXIMUM RATINGS Input Voltage (V ) Operating .............................................. IN Input Voltage (V ) Overvoltage Transient .............. IN ON/OFF Switch ...................................................... THERMAL DATA P Package: Thermal Resistance- Junction to Case Thermal Resistance- Junction to Ambient * = (Junction to Tab) ...

Page 3

ELECTRICAL CHARACTERISTICS Parameter Standby Output (V ) Section SB Output Voltage (Note 4) Line Regulation Load Regulation Output Impedance Quiescent Current Output Noise Voltage Long Term Stability Ripple Rejection Dropout Voltage Current Limit Maximum Operational Input Voltage Note 4. The ...

Page 4

... CONNECTION DIAGRAM & ORDERING INFORMATION Package Part No. SG29085P 5-PIN TO-220 PLASTIC P - PACKAGE SG29085AP Note: 1. All packages are viewed from the top. 12/90 Rev 1.1 2/94 Copyright 1994 the current through the external resistor should be sufficient to bias internal resistors up to this point. Approximately 60 A will suffice, resulting in a 10k external resistor for most applications (Figure 1) ...

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