Document
SG140A/SG140
POSITIVE FIXED VOLTAGE REGULATOR
DESCRIPTION
The SG140A/140 series of positive regulators offer self contained, fixed-voltage capability with up to 1.5A of load current and input voltage up to 50V (SG140A series only). These units feature a unique on-chip trimming system to set the output voltages to within ±1.5% of nominal on the SG140A series and ±2.0% on the SG140 series. The SG140A 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 (isolated), TO-3, TO-66, and TO-39 power packages.
FEATURES
• Output voltage set internally to ±1.5% on SG140A • Input voltage reange to 50V max. on SG140A • Two volt input-output differential • Bandgap reference voltage • Excellent line and load regulation • Foldback current limiting • Thermal overload protection • Voltages available - 5V, 12V, 15V • Voltages Not Recommended For New Designs - 6V, 8V, 18V, 24V
HIGH RELIABILITY FEATURES - SG140A/140
♦ Available to MIL-STD - 883 ♦ Radiation data available ♦ LMI level "S" processing available
SCHEMATIC DIAGRAM
2/90 Rev 1.4 6/97
Copyright 1997
1
11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG140A/SG140 SERIES
ABSOLUTE MAXIMUM RATINGS (Note 1)
Device Output Voltage 5V 6V 8V 12V 15V 18V 24V Input Voltage 35V 35V 35V 35V 35V 35V 40V
POSITIVE REGULATOR
Input Voltage (transient) (Note 3) 50V 50V 50V 50V 50V 50V 50V Input Voltage Differential (Output shorted to ground) 35V 35V 35V 35V 35V 35V 35V
Operating Junction Temperature Hermetic (K, R, IG - Packages) ................................... 150°C
Note 1. Values beyond which damage may occur.
Storage Temperature Range ............................ -65°C to 150°C Lead Temperature (Soldering, 10 Seconds) ................... 300°C
THERMAL DATA
K Package: Thermal Resistance-Junction to Case, θJC ................. 3.0°C/W Thermal Resistance-Junction to Ambient, θJA ............... 35°C/W R Package: Thermal Resistance-Junction to Case, θJC ................. 5.0°C/W Thermal Resistance-Junction to Ambient, θJA .............. 40°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 for θJC 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: SG140A/140 .................................................. -55°C to 150°C
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
2/90 Rev 1.4 6/97
Copyright 1997
2
11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG140A/SG140 SERIES
CHARACTERISTIC CURVES
(continued)
POSITIVE REGULATOR
FIGURE 2. MINIMUM INPUT - OUTPUT VOLTAGE VS. LOAD CURRENT
FIGURE 3. RIPPLE REJECTION VS. FREQUENCY
FIGURE 4. TEMPERATURE COEFFICIENT OF OUTPUT VOLTAGE
APPLICATIONS
FIGURE 5 - FIXED OUITPUT REGULATOR
FIGURE 6 - CIRCUIT FOR INCREASING OUITPUT VOLTAGE
FIGURE 7 - HIGH OUTPUT CIRRENT, SHORT CIRCU.