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SG29125A Datasheet(PDF) 3 Page - Microsemi Corporation |
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SG29125A Datasheet(HTML) 3 Page - Microsemi Corporation |
3 / 4 page SG29125/125A 12/90 Rev 1.1 2/94 LINFINITY Microelectronics Inc. Copyright © 1994 11861 Western Avenue ∞ ∞ ∞ ∞ ∞ Garden Grove, CA 92841 3 (714) 898-8121 ∞ ∞ ∞ ∞ ∞ FAX: (714) 893-2570 ELECTRICAL CHARACTERISTICS (continued) Test Conditions Parameter Standby Output (V SB ) Section Units 6V ≤ V IN ≤ 26V, IO ≤ 50mA, -40°C ≤ TA ≤ 85°C 6V ≤ V IN ≤ 26V 1mA ≤ I O ≤ 35mA 1mA ≤ I O ≤ 50mA 1mA DC and 1mARMS, 100Hz - 10kHz I O ≤ 10mA, VOUTOFF 10Hz - 100kHz F O = 120Hz I O ≤ 50mA 4.75V ≤ V O ≤ 6V SG29125/125A Min. Max. 4.75 50 60 5.0 4 10 25 1 1.2 300 20 66 0.55 100 70 5.25 50 25 50 3 0.7 Typ. V mV mV mV Ω mA µV RMS mV/1000hr dB V mA V 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 TYPICAL CIRCUIT WAVEFORM 14V 0V 2V 0.8V 5V 0V 5V INPUT VOLTAGE PIN 1 (V) ON/OFF SWITCH OUTPUT VOLTAGE PIN 2 (V) STANDBY VOLTAGE PIN 5 (V) TURN ON SYSTEM CONDITION LOAD DUMP LOW V IN 3.7V 3.5V 12V 12V 12V 60V 33V 4V 26V 14V 0.8V 0V 12V 12V 5.0V TURN OFF THERMAL SHUTDOWN V OUT SHORT CIRCUIT LINE NOISE, ETC. Note 4. The temperature extremes are guaranteed but not 100% production tested. APPLICATION NOTES regulator enters a micropower mode. Here all but the most essential circuitry to power the standby output is deactivated. This allows the lowest possible quiescent current (typical around 1.2mA), a vital factor when used in a battery powered system. In some applications the regulator output voltage is used not only as a power supply but also as a voltage reference for control systems. In such cases not just the temperature stability of the output is important but also the initial accuracy. The SG29125/ 125A fills this need as the internal bandgap reference is trimmed allowing a typical output voltage tolerance of ±1%. The advantages of using a low-dropout regulator such as the SG29125/125A are the need for less “headroom” for full regula- tion, and the inherent reverse polarity protection provided by the PNP output device. A typical NPN regulator design requires an input to output differential of approximately two volts minimum. This is due to the 2Vbe + Vcesat of the NPN Darlington used in the output, coupled with the voltage drop across the current limit resistor. In contrast, the “PNP Regulator” uses a single series pass transistor with its single Vcesat, thus the lower input to output voltage differential or dropout voltage. In addition to a low dropout voltage, an important advantage of the SG29125/125A series is low quiescent current in the standby mode. When the high current or primary regulator is shut off, the |
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