SG29125A Microsemi Corporation, SG29125A Datasheet

SG29125A

Manufacturer Part Number

SG29125A

Description

LOW DROPOUT DUAL REGULATOR

Manufacturer

Microsemi Corporation

Datasheet

1.SG29125A.pdf (4 pages)

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12/90 Rev 1.1 2/94

DESCRIPTION

The SG29125/125A is a dual 12V/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 character-

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

the SG29125/125A well suited for power systems that require standby memory. The

SG29125/125A 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 SG29125 is the 12 volt, ±5% version of a family of dual regulators with a standby

output voltage of 5V. Other high current outputs of 5 and 8.2 volts are available. Also

available is the SG29125A 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

SG29125/125A

LOW DROPOUT DUAL REGULATOR

REGULATOR

REFERENCE

5V STANDBY

GROUND

1.23V

BIAS

5.6V

* Required if regulator is located far from power

** Required for stability. May be increased without

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

SG29125/125A

INFINITY Microelectronics Inc.

(714) 898-8121

OUTPUT VOLTAGE

STANDBY OUTPUT

(12V, 1000mA)

(5V, 50mA)

Garden Grove, CA 92841

FAX: (714) 893-2570

Related parts for SG29125A

SG29125A Summary of contents

Page 1

... The SG29125 is the 12 volt, ±5% version of a family of dual regulators with a standby output voltage of 5V. Other high current outputs of 5 and 8.2 volts are available. Also available is the SG29125A 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 - ...

Page 2

... V and are for DC characteristics only. Low duty cycle pulse testing techniques are used which SB Test Conditions 13V V 26V, I 1000mA, - SG29125 SG29125A 13V V 16V 5mA IN O 13V V 26V 5mA IN ...

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. SG29125P 5-PIN TO-220 PLASTIC P - PACKAGE SG29125AP Note: 1. All parts 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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