Microsemi Corporation SG7812AK, SG7812AR, SG7812AT, SG7805K, SG7805R Datasheet

SG7800A/SG7800 SERIES

SG7800A/SG7800

POSITIVE FIXED VOLTAGE REGULATOR

DESCRIPTION

The SG7800A/SG7800 series of positive regulators offer self contained, fixed-voltage capability with up to 1.5A of load current and input voltage up to 50V (SG7800A series only). These units feature a unique on-chip trimming system to set the output voltages to within±1.5% of nominal on the SG7800A series,±2.0% on the SG7800 series. The SG7800A versions also offer much improved line and load regulation characteristics. Utilizing an improved Bandgap reference design, problems have been eliminated that are normally associated with the Zener diode references, such as drift in output voltage and large changes in the line and load regulation.

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 insures good regulation when this method is used.

Product is available in hermetically sealed TO-257, TO-3, TO39 and LCC packages.

FEATURES

∙Output voltage set internally to ±1.5% on SG7800A

∙Input voltage range to 50V max. on SG7800A

∙Two volt input-output differential

∙Excellent line and load regulation

∙Foldback current limiting

∙Thermal overload protection

∙Voltages available: 5V, 12V, 15V

∙Available in surface mount package

HIGH RELIABILITY FEATURES

- SG7800A/7800

♦Available to MIL-STD - 883

♦MIL-M38510/10702BXA - JAN7805T

♦MIL-M38510/10703BXA - JAN7812T

♦MIL-M38510/10704BXA - JAN7815T

♦MIL-M38510/10706BYA - JAN7805K

♦MIL-M38510/10707BYA - JAN7812K

♦MIL-M38510/10708BYA - JAN7815K

♦Radiation data available

♦LMI level "S" processing available

SCHEMATIC DIAGRAM

*

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

12/91 Rev 1.3 10/97

LINFINITY Microelectronics Inc.

Copyright ã 1997	11861 Western Avenue ∞ Garden Grove, CA 92841
1	[phone] ∞ FAX: [phone]

SG7800A/SG7800 SERIES		POSITIVE REGULATOR
ABSOLUTE MAXIMUM RATINGS (Note 1)
Device		Input Voltage		Input Voltage Differential
Output Voltage	Input Voltage	(transient) (Note 3)	(Output shorted to ground)
5V	35V	50V		35V
12V	35V	50V		35V
15V	35V	50V		35V
Operating Junction Temperature		Storage Temperature Range		..........................	-65°C to 150°C
Hermetic (K, T, IG & L - Packages) .........................		150°C Lead Temperature (Soldering, 10 Seconds) .................			300°C

Note 1. Values beyond which damage may occur.

THERMAL DATA

K Package:
Thermal Resistance-Junction to Case, θJC .................	3.0°C/W
Thermal Resistance-Junction to Ambient, θJA ...............	35°C/W
T Package:
Thermal Resistance-Junction to Case, θJC ..................	15°C/W
Thermal Resistance-Junction to Ambient, θJA ............	120°C/W
IG Package:
Thermal Resistance-Junction to Case, θJC .................	3.5°C/W
Thermal Resistance-Junction to Ambient, θJA ..............	42°C/W
L Package:
Thermal Resistance-Junction to Case, θJC ..................	35°C/W
Thermal Resistance-Junction to Ambient, θJA ............	120°C/W

Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).

Note B. The above numbers forθJC are maximums for the limiting thermal resistance of the package in a standard mounting configuration. The θJA numbers are meant to be guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.

RECOMMENDED OPERATING CONDITIONS (Note 2)

Operating Junction Temperature Range:	-55°C to 150°C
SG7800A/SG7800 ........................................

Note 2. Range over which the device is functional.

CHARACTERISTIC CURVES

Note 3. Operation at high input voltages is dependent upon load current. When load current is less than 5mA, output will rise out of regulation as inputoiutput differential icreases beyond 30V. Note also from Figure 1, that maximum load current is reduced at high voltages. The 50V input rating of the SG140A series refers to ability to withstnd high line or transient conditions without damage. Since the regulator's maximum current capability is reduced, the output may fall out of regulation at high input voltages under nominal loading.

FIGURE 1.

PEAK OUTPUT CURRENT

VS. INPUT - OUTPUT DIFFERENTIAL

12/91 Rev 1.3 10/97

LINFINITY Microelectronics Inc.

Copyright ã 1997	11861 Western Avenue ∞ Garden Grove, CA 92841
2	[phone] ∞ FAX: [phone]

SG7800A/SG7800 SERIES		POSITIVE REGULATOR
CHARACTERISTIC CURVES (continued)
FIGURE 2.	FIGURE 3.	FIGURE 4.
MINIMUM INPUT - OUTPUT VOLTAGE	RIPPLE REJECTION VS. FREQUENCY	TEMPERATURE COEFFICIENT OF OUTPUT VOLTAGE
VS. LOAD CURRENT
APPLICATIONS
FIGURE 5 - FIXED OUTPUT REGULATOR		FIGURE 6 - CIRCUIT FOR INCREASING OUTPUT VOLTAGE
FIGURE 7 - HIGH OUTPUT CURRENT, SHORT CIRCUIT PROTECTED		FIGURE 8 - ADJUSTABLE OUTPUT REGULATOR, 7V to 30V

12/91 Rev 1.3 10/97

LINFINITY Microelectronics Inc.

Copyright ã 1997	11861 Western Avenue ∞ Garden Grove, CA 92841
3	[phone] ∞ FAX: [phone]