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| LIN D O C #: 3546 SG3546 3 . 3 V U N D E R V O LTA G E S E N S I N G C I R C U I T T HE I NFINITE P OWER OF I N N O VAT I O N P RODUCTION D ATA S HEET DESCRIPTION The SG3546 is an undervoltage sensing circuit specifically designed for use as a reset controller in 3.3V microprocessor-based applications. Its micropower operation makes this device ideal for portable applications where extended battery life is required. The device offers a 1.2V temperature compensated bandgap reference, a precision comparator with hysteresis and a high-current open collector output. This device operates from 1 to 10V input supply and drains <10A in the non-fault condition. The SG3546 is available in an 8-pin 150mil SOIC package or a 3-pin TO-92 package and is rated for an ambient temperature of 0C to 70C. K E Y F E AT U R E S s LOW STANDBY CURRENT s INTERNAL VOLTAGE THRESHOLD AT 2.95V s TEMPERATURE COMPENSATED BANDGAP REFERENCE s PRECISION COMPARATOR WITH 40MV OF HYSTERESIS s CLAMP DIODE FOR DISCHARGING DELAY CAPACITOR s OUTPUT CURRENT SINK CAPABILITY (typ 5mA) s 1-10V INPUT SUPPLY RANGE s AVAILABLE IN 150MIL, 8-PIN SOIC AND 3-PIN TO-92 PACKAGES PRODUCT HIGHLIGHT LOW-VOLTAGE MICROPROCESSOR RESET 2 1 POWER SUPPLY R RESET CDLY MICROPROCESSOR CIRCUIT 1.2 VREF 3 PA C K A G E O R D E R I N F O R M AT I O N T A (C) 0 to 70 DM Plastic SOIC 8-pin SG3546DM LP Plastic TO-92 3-pin SG3546LP Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. SG3546DMT) F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1 Copyright (c) 1994 Rev. 1.3 1/96 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841 1 PRODUCT DATABOOK 1996/1997 SG3546 3 . 3 V U N D E R V O LT A G E S E N S I N G C I R C U I T P RODUCTION D ATA S HEET A B S O L U T E M A X I M U M R AT I N G S (Note 1) PACKAGE PIN OUTS RESET INPUT N.C. GROUND 1 2 3 4 8 7 6 5 N.C. N.C. N.C. N.C. Input Supply Voltage (VIN)............................................................................... -1V to 12V RESET Output Voltage (VOUT) .......................................................................... -1V to 12V Clamp Diode Forward Current .............................................................................. 100mA Operating Junction Temperature Plastic (DM - Package) ......................................................................................... 150C Storage Temperature Range ...................................................................... -65C to 150C Lead Temperature (Soldering, 10 seconds) ............................................................ 300C Note 1. Values beyond which damage may occur. All voltages are specified with respect to ground, and all currents are positive into the specified terminal. DM PACKAGE (Top View) 3. GROUND T H E R M A L D ATA DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA LP PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 156C/W Junction Temperature Calculation: TJ = T A + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. 165C/W 2. INPUT 1. RESET LP PACKAGE (Top View) BLOCK DIAGRAM INPUT 2 RESET 1 1.2 VREF 4 GROUND 2 Copyright (c) 1994 Rev. 1.3 2/96 PRODUCT DATABOOK 1996/1997 SG3546 3 . 3 V U N D E R V O LTA G E S E N S I N G C I R C U I T P RODUCTION D ATA S HEET R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S Parameter Input Supply Voltage RESET Output Voltage Clamp Diode Forward Current Operating Ambient Temperature Range: SG3546 Note 2. Range over which the device is guaranteed functional. (Note 2) Symbol Recommended Operating Conditions Min. Typ. Max. 1 10 10 50 70 Units V V mA C TA 0 ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0C T A 70C for the SG3546. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter Total Device Operating Input Voltage Range Quiescent Input Current Symbol Test Conditions Min. 1.0 SG3546 Typ. Max. 10 20 50 Units V A A VIN IIN VIN = 3.3V VIN = 10V 10 19 Comparator Section Threshold Voltage High-State Output Low-State Output Hysteresis VIH VIL VH VOL ISINK VIN Increasing VIN Decreasing 2.75 2.75 2.81 2.86 40 0.05 0.06 3.0 3.0 V V mV V V mA A A V RESET Output Section Output Sink Saturation Output Sink Current Output Off-State Leakage Clamp Diode Forward Voltage VIN = 2.6V, ISINK = 1mA VIN = 1.0V, ISINK = 100A VIN , RESET = 2.6V VIN , RESET = 3.6V VIN , RESET = 10V Pin 1 to pin 2, (IF = 5.0mA) 0.40 0.30 20 0.5 2.0 1.2 VF 0.5 Copyright (c) 1994 Rev. 1.3 2/96 3 PRODUCT DATABOOK 1996/1997 SG3546 3 . 3 V U N D E R V O LT A G E S E N S I N G C I R C U I T P RODUCTION D ATA S HEET GRAPH / CURVE INDEX FIGURE INDEX Characteristic Curves FIGURE # 1. 2. 3. 4. 5. 6. COMPARATOR THRESHOLD VOLTAGE vs. TEMPERATURE RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE RESET OUTPUT SATURATION vs. SINK CURRENT INPUT CURRENT vs. INPUT VOLTAGE RESET DELAY TIME (LOW to HIGH) RESET DELAY TIME (HIGH to LOW) FIGURE # 7. 8. 9. Application Circuits SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW VTH LOW VOLTAGE MICROPROCESSOR RESET VOLTAGE MONITOR 4 Copyright (c) 1994 Rev. 1.3 2/96 PRODUCT DATABOOK 1996/1997 SG3546 3 . 3 V U N D E R V O LTA G E S E N S I N G C I R C U I T P RODUCTION D ATA S HEET C H A R A C T E R I S T I C C U RV E S FIGURE 1. -- COMPARATOR THRESHOLD VOLTAGE vs. TEMPERATURE RL = 43K to VIN 3.050 FIGURE 2. -- RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE 4 Threshold Voltage - (V) 3.000 2.950 2.900 2.850 2.800 2.750 0 -50 -25 0 25 50 75 100 125 0 RL = 82K to VIN TA = 25C Output Voltage - (V) 3 2 1 1 2 3 4 5 Junction Temperature - (C) Input Voltage - (V) FIGURE 3. -- RESET OUTPUT SATURATION vs. SINK CURRENT FIGURE 4. -- INPUT CURRENT vs. INPUT VOLTAGE 70 RL = TA = 25C (VOL) Output Saturation - (mV) 300 Input Current - (A) 6 9 12 14 VIN = 3V TA = 25C 60 50 40 30 20 10 200 100 0 0 3 0 0 0.5 1 1.5 2 2.5 3 3.5 4 (ISINK) Sink Current - (mA) Input Voltage - (V) Copyright (c) 1994 Rev. 1.3 2/96 5 PRODUCT DATABOOK 1996/1997 SG3546 3 . 3 V U N D E R V O LT A G E S E N S I N G C I R C U I T P RODUCTION D ATA S HEET CHARACTERISTIC CURVES FIGURE 5. -- RESET DELAY TIME (LOW TO HIGH) FIGURE 6. -- RESET DELAY TIME (HIGH TO LOW) VIN VIN 3.3V 2.7V 43K RESET 3.3V 2.7V 43K RESET REF REF 100% 3.3V 100% 3.3V 2.7V 2.7V 0% VIN = 3.3V to 2.6V RL = 43K TA = 25C 0% VIN = 4.0V to 5.0V RL = 43K TA = 25C 2s/DIV. 0.5s/DIV. 6 Copyright (c) 1994 Rev. 1.3 2/96 PRODUCT DATABOOK 1996/1997 SG3546 3 . 3 V U N D E R V O LTA G E S E N S I N G C I R C U I T P RODUCTION D ATA S HEET T Y P I C A L A P P L I C AT I O N C I R C U I T S 2 1 POWER SUPPLY R RESET CDLY MICROPROCESSOR CIRCUIT 2 1 RESET LOAD 1.2 VREF 3 1.2 VREF 4 A time-delayed reset can be accomplished with the addition of C DLY. For systems with extremely fast power supply rise times (< 500ns), it is recommended that the RCDLY time constant be greater than 5.0s. VTH(MPU) is the microprocessor reset input threshold. tDLY = R CDLY In 1 VTH(MPU) 1- V IN FIGURE 7. -- SWITCHING THE LOAD OFF WHEN BATTERY VOLTAGE REACHES BELOW VTH FIGURE 8. -- LOW VOLTAGE MICROPROCESSOR RESET 1.0k 2 1 POWER SUPPLY RESET 1.2 VREF 3 FIGURE 9. -- VOLTAGE MONITOR Copyright (c) 1994 Rev. 1.3 2/96 7 |
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