MC33064DM 5 UNDERVOLTAGE SENSING CIRCUIT

Transcription

1 Order this document by MC3464/D The MC3464 is an undervoltage sensing circuit specifically designed for use as a reset controller in microprocessor-based systems. It offers the designer an economical solution for low voltage detection with a single external resistor. The MC3464 features a trimmed-in-package bandgap reference, and a comparator with precise thresholds and built-in hysteresis to prevent erratic reset operation. The open collector reset output is capable of sinking in excess of ma, and operation is guaranteed down to. V input with low standby current. These devices are packaged in 3-pin TO-226AA, 8-pin SO8 and Micro8 surface mount packages. Applications include direct monitoring of the 5. V MPU/logic power supply used in appliance, automotive, consumer and industrial equipment. Trimmed-In-Package Temperature Compensated Reference Comparator Threshold of 4.6 V at 25 C Precise Comparator Thresholds Guaranteed Over Temperature Comparator Hysteresis Prevents Erratic Output Capable of Sinking in Excess of ma Internal Clamp Diode for Discharging Delay Capacitor Guaranteed Operation with. V Input Low Standby Current Economical TO226AA, SO8 and Micro8 Surface Mount Packages UNDERVOLTAGE SENSING CIRCUIT P SUFFIX CASE 29 (TO226AA) SEMICONDUCTOR TECHNICAL DATA 2 3 D SUFFIX CASE 75 (SO8) Pin Input 3. Ground Input Representative Block Diagram DM SUFFIX CASE 846A (Micro8) 8 () Input N.C. Ground 8 N.C. 2 7 N.C. 3 6 N.C. 4 5 N.C. (Top View).2 Vref ORDERING INFORMATION Gnd = Sink Only Positive True Logic Pin numbers adjacent to terminals are for the 3pin TO226AA package. Pin numbers in parenthesis are for the 8lead packages. This device contains 2 active transistors. Device MC3464D5 MC3464DM5 MC3464P5 MC3364D5 MC3364DM5 MC3364P5 Operating Temperature Range TA = to 7 C TA = 4 to 85 C Package SO8 Micro8 TO226AA SO8 Micro8 TO226AA MOTOROLA ANALOG IC DEVICE DATA Motorola, Inc. 996 Rev 2

2 MAXIMUM RATINGS MC3464 MC3364 Rating Symbol Value Unit Power Input Supply Voltage Vin. to V Output Voltage VO V Output Sink Current (Note ) ISink Internally Limited Clamp Diode Forward Current, Pin to 2 (Note ) IF ma Power Dissipation and Thermal Characteristics P Suffix, Plastic Package Maximum Power Thermal Resistance, JunctiontoAir D Suffix, Plastic Package Maximum Power Thermal Resistance, JunctiontoAir DM Suffix, Plastic Package Maximum Power Thermal Resistance, JunctiontoAir PD RθJA PD RθJA PD RθJA ma mw C/W mw C/W mw C/W Operating Junction Temperature TJ 5 C Operating Ambient Temperature MC3464 MC3364 TA to 7 4 to 85 Storage Temperature Range Tstg 65 to 5 C C NOTE: ESD data available upon request. ELECTRICAL CHARACTERISTICS (For typical values, for min/max values TA is the operating ambient temperature range that applies [Notes 2 and 3] unless otherwise noted.) Characteristics Symbol Min Typ Max Unit COMPARATOR Threshold Voltage High State Output (Vin Increasing) Low State Output (Vin Decreasing) Hysteresis VIH VIL VH V RESET OUTPUT Output Sink Saturation (Vin = 4. V, ISink = 8. ma) (Vin = 4. V, ISink = 2. ma) (Vin =. V, ISink =. ma) Output Sink Current (Vin, = 4. V) ISink 27 6 ma Output Off-State Leakage (Vin, = 5. V) IOH.2.5 µa Clamp Diode Forward Voltage, Pin to 2 (IF = ma) VF V TOTAL DEVICE Operating Input Voltage Range Vin. to 6.5 V Quiescent Input Current (Vin = 5. V) Iin 39 5 µa NOTES:. Maximum package power dissipation limits must be observed. 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 3. T low = C for MC3464 T high = 7 C for MC C for MC C for MC3364 VOL V 2 MOTOROLA ANALOG IC DEVICE DATA

3 I MC3464 MC3364 V O, OUTPUT VOLTAGE (V) Figure. Output Voltage versus Input Voltage RL = k to Vin V O, OUTPUT VOLTAGE (V) Figure 2. Output Voltage versus Input Voltage RL = k to Vin Vin, INPUT VOLTAGE (V) Vin, INPUT VOLTAGE (V) th, THRESHOLD VOLTAGE (V) V Figure 3. Comparator Threshold Voltage versus Temperature RL = k to Vin Upper Threshold High State Output Lower Threshold Low State Output in, INPUT CURRENT (ma) Figure 4. Input Current versus Input Voltage 4 C 85 C 85 C 4 C TA, AMBIENT TEMPERATURE ( C) Vin, INPUT VOLTAGE (V) V OL, OUTPUT SATURATION (V) Figure 5. Output Saturation versus Sink Current Vin = 4. V TA = 85 C TA = 4 C 9% 5. V 4. V % 5.V 4.V V in Vin Figure 6. Delay Time k Vin = 5. V to 4. V RL = k REF ISink, SINK CURRENT (ma) 2 ns/div MOTOROLA ANALOG IC DEVICE DATA 3

4 I F, FORWARD CURRENT (ma) Figure 7. Clamp Diode Forward Current versus Voltage Vin = V MC3464 MC VF, FORWARD VOLTAGE (V) Figure 8. Low Voltage Microprocessor Power Supply.2 Vref () R CDLY A time delayed reset can be accomplished with the addition of CDLY. For systems with extremely fast power supply rise times (<5 ns) it is recommended that the RCDLY time constant be greater than 5. µs. Vth(MPU) is the microprocessor reset input threshold. tdly = RCDLY In Microprocessor Circuit V th(mpu) Vin Figure 9. Low Voltage Microprocessor with Additional Hysteresis Power Supply Iin RH.2Vref RL () VH 4.6 R H.2 RL Vth(lower) 34 RH x 6 Where: RH 5 Ω Where: RL.5 Ω, kω Microprocessor Circuit Comparator hysteresis can be increased with the addition of resistor RH. The hysteresis equation has been simplified and does not account for the change of input current Iin as VCC crosses the comparator threshold (Figure 4). An increase of the lower threshold Vth(lower) will be observed due to Iin which is typically 34 µa at 4.59 V. The equations are accurate to ±% with RH less than 5 Ω and RL between.5 kω and kω. V H (mv) Test Data V th (mv) R H (Ω) R L (kω) MOTOROLA ANALOG IC DEVICE DATA

5 Figure. Voltage Monitor MC3464 MC3364 Figure. Solar Powered Battery Charger Power Supply ().k () Solar Cells.2Vref.2Vref Figure 2. Low Power Switching Regulator 25µH Vin =.5 to 4.5V 4.7k 47 MPSW5A 47 N k VO = 5. V IO = 5 ma 33 N756 ().2Vref Test Conditions Results Line Regulation Vin =.5 V to 4.5 V, IO = 5 ma 35 mv Load Regulation Vin = 2.6 V, IO = ma to 5 ma 2 mv Output Ripple Vin = 2.6 V, IO = 5 ma 6 mvpp Efficiency Vin = 2.6 V, IO = 5 ma 77% Figure 3. MOSFET Low Voltage Gate Drive Protection VCC RL 4.6V 27 MTP355EL ().2Vref Overheating of the logic level power MOSFET due to insufficient gate voltage can be prevented with the above circuit. When the input signal is below the 4.6 V threshold of the MC3464, its output grounds the gate of the L2 MOSFET. MOTOROLA ANALOG IC DEVICE DATA 5

6 MC3464 MC3364 OUTLINE DIMENSIONS SEATING PLANE R A X X H V N F G P N B L K C P SUFFIX CASE 294 (TO226AA) ISSUE AD D J SECTION XX NOTES:. DIMENSIONING AND TOLERANCING PER ANSI Y4.5M, CONTROLLING DIMENSION: INCH. 3. CONTOUR OF PACKAGE BEYOND DIMENSION R IS UNCONTROLLED. 4. DIMENSION F APPLIES BETWEEN P AND L. DIMENSION D AND J APPLY BETWEEN L AND K MINIMUM. LEAD DIMENSION IS UNCONTROLLED IN P AND BEYOND DIMENSION K MINIMUM. INCHES MILLIMETERS DIM MIN MAX MIN MAX A B C D F G H J K L N P R V B 8 A 5 4 4X P.25 (.) M B M D SUFFIX CASE 755 (SO8) ISSUE P X 45 R J NOTES:. DIMENSIONS A AND B ARE DATUMS AND T IS A DATUM SURFACE. 2. DIMENSIONING AND TOLERANCING PER ANSI Y4.5M, DIMENSIONS ARE IN MILLIMETER. 4. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 5. MAXIMUM MOLD PROTRUSION.5 PER SIDE. 6. DIMENSION D DOES NOT INCLUDE MOLD PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE.27 TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. T K G 8X D C SEATING PLANE.25 (.) M T B S A S M F MILLIMETERS DIM MIN MAX A B C D F.4.25 G.27 BSC J.8.25 K..25 M 7 P R MOTOROLA ANALOG IC DEVICE DATA

7 MC3464 MC3364 PIN ID K T SEATING PLANE.38 (.5) G A B OUTLINE DIMENSIONS DM SUFFIX CASE 846A2 (Micro8) ISSUE B NOTES:. DIMENSIONING AND TOLERANCING PER ANSI Y4.5M, CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED.5 (.6) PER SIDE. 4. DIMENSION D DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED.25 (.) PER SIDE. D 8 PL MILLIMETERS INCHES.8 (.3) M T B S A S DIM MIN MAX MIN MAX A B C..43 D G.65 BSC.26 BSC C H J K L H J L MOTOROLA ANALOG IC DEVICE DATA 7

8 MC3464 MC3364 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Typical parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customer s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; JAPAN: Nippon Motorola Ltd.; TatsumiSPDJLDC, 6F SeibuButsuryuCenter, P.O. Box 292; Phoenix, Arizona or Tatsumi KotoKu, Tokyo 35, Japan MFAX: RMFAX@ .sps.mot.com TOUCHTONE ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, INTERNET: 5 Ting Kok Road, Tai Po, N.T., Hong Kong MOTOROLA ANALOG IC DEVICE MC3464/D DATA

9 This datasheet has been download from: Datasheets for electronics components.