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SG7815AG-DESC

Positive Fixed Voltage Regulator

Microsemi Corporation 

SG78xxA/78xx

Positive Fixed Voltage Regulator

Description

The SG78xxA/SG78xx series of positive regulators offer

self-contained, fixed-voltage capability with up to 1.5 A of

load current and input voltage up to 50 V (SG78xxA series

only). These units feature a unique on-chip trimming system

to set the output voltages to within ±1.5% of nominal on the

SG78xxA series with ±2.0% on the SG78xx series. The

SG78xxA versions also offer much improved line and load

regulation characteristics. Utilizing an improved bandgap

reference design, problems such as drift in output voltage

and large changes in the line and load regulation, that are

normally associated with the Zener diode references have

been eliminated.

All protective features of thermal shutdown, current limiting,

and safe-area control have been designed into these units

and since these regulators require only a small output

capacitor for satisfactory performance, ease of application is

assured. Although designed as fixed-voltage regulators, the

output voltage can be increased through the use of a simple

voltage divider. The low quiescent drain current of the device

ensures good regulation when this method is used. Product

is available in hermetically sealed TO-257 (both case

grounded ‘G’ and isolated ‘IG’), TO-3, TO-39 and leadless

chip carrier (LCC) packages.

Circuit Schematic

Features

 Output Voltage Set Internally to ±1.5% on SG78xxA

 Input Voltage Range to 50 V max on SG78xxA

 2 V Input-Output Differential

 Excellent Line and Load Regulation

 Fold back Current Limiting

 Thermal Overload Protection

 Voltages Available: 5 V, 12 V, 15 V

 Contact Factory for Other Voltage Options

 Available in Surface Mount Package

High Reliability Features

 Available to MIL-STD - 883, ¶ 1.2.1

 MIL-M38510/10702BXA - SG7805T-JAN

 MIL-M38510/10703BXA - SG7812T-JAN

 MIL-M38510/10704BXA - SG7815T-JAN

 MIL-M38510/10706BYA - SG7805K-JAN

 MIL-M38510/10707BYA - SG7812K-JAN

 MIL-M38510/10708BYA - SG7815K-JAN

 MSC-AMSG level “S” Processing Available

 Available to DSCC

-Standard Microcircuit Drawing (SMD)

VIN 1

Q1

CURRENT REF

R1

Q9

R2

Q10

R3

Q11

Q2

Q3 THERMAL

SHUTDOWN

R4

Q6

R5

REMOTE

SHUTDOWN

Q19A

Q19B

ENABLE

R7

Q28

R26

R10

Q12

Q13

Output stage and SOA circuit

Z2

Z3

BANDGAP

REFERENCE

R8

Q22

Q24

R19

R20

R12

Q17

Q18

Q27

Q16

Q14

R11

Q15

R13

Q23

R14

R15

R28

R25

Q25

Q26

R27

R18 VOUT

2

R23

*VOS

R22A

Q4

Z1

Q7

F4

Q8

C2

C1

R22B

F1

R9

R22C

F2

R24

GND 3

Q5

R6

R22D

F3

R22E

F4

* For normal operation, the (VOS) sense pin must be externally connected to the load

Figure 1 · Circuit Schematic

January 2015 Rev. 1.5

www.microsemi.com

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© 2015 Microsemi Corporation

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