LM3812MX-7.0

LM3812, LM3813 www.ti.com SNOS028D – JUNE 1999 – REVISED APRIL 2013 LM3812/LM3813 Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output Check for Samples: LM3812, LM3813 FEATURES DESCRIPTION • • The LM3812/LM3813 Current Gauges provide easy to use precision current measurement with virtually zero insertion loss (typically 0.004Ω). The LM3812 is used for high-side sensing and the LM3813 is used for low-side sensing. 1 2 • • • • • No External Sense Element Required PWM Output Indicates the Current Magnitude and Direction PWM Output can be Interfaced with Microprocessors Precision ΔΣ Current-Sense Technique Low Temperature Sensitivity Internal Filtering Rejects False Trips Internal Power-On-Reset (POR) APPLICATIONS • • • • Battery Charge/Discharge Gauge Motion Control Diagnostics Power Supply Load Monitoring and Management Resettable Smart Fuse A Delta Sigma analog to digital converter is incorporated to precisely measure the current and to provide a current averaging function. Current is averaged over 50 msec time periods in order to provide immunity to current spikes. The ICs have a pulse-width modulated (PWM) output which indicates the current magnitude and direction. The shutdown pin can be used to inhibit false triggering during startup, or to enter a low quiescent current mode. The LM3812 and LM3813 are factory-set in two different current options. The sense range is −1A to +1A or −7A to +7A. The sampling interval for these parts is 50ms. If faster sampling is desired, please refer to the data sheets for the part numbers LM3814 and LM3815. KEY SPECIFICATIONS • • • • • Ultra Low Insertion Loss (Typically 0.004Ω) 2V to 5.25V Supply Range ±2% Accuracy at Room Temperature (Includes Accuracy of the Internal Sense Element) ( LM3812-1.0, LM3813-1.0) Low Quiescent Current In Shutdown Mode (Typically 2.5 µA) 50 msec Sampling Interval Connection Diagrams Figure 1. LM3812 (Top View) for High-Side Sensing Figure 2. LM3813 (Top View) for Low-Side Sensing 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 1999–2013, Texas Instruments Incorporated LM3812, LM3813 SNOS028D – JUNE 1999 – REVISED APRIL 2013 www.ti.com PIN DESCRIPTIONS (High-Side, LM3812) Pin Name Function 1 SENSE+, VDD High side of internal current sense, also supply voltage. 2 SENSE− Low side of internal current sense. 3 FLTR+ Filter input — provides anti-aliasing for delta sigma modulator. 4 FLTR− Filter input. 5 SD Shutdown pin. Connected to VDD through a pull up resistor for normal operation. When low, the IC goes into a low current mode (typically 3 µA). 6 PWM PWM output indicates the current magnitude and direction. 7 GND Ground 8 GND Ground PIN DESCRIPTIONS (Low-Side, LM3813) Pin Name Function 1 SENSE+, GND High side of internal current sense, also ground. 2 SENSE− Low side of internal current sense. 3 FLTR+ Filter input – provides anti-aliasing for delta sigma modulator. 4 FLTR− Filter input. 5 SD Shutdown pin. Connected to VDD through a pull up resistor for normal operation. When low, the IC goes into a low current mode (typically 3 µA). 6 PWM PWM output indicates the current magnitude and direction. 7 GND Ground 8 VDD VDD (supply) These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 2 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 LM3812, LM3813 www.ti.com SNOS028D – JUNE 1999 – REVISED APRIL 2013 ABSOLUTE MAXIMUM RATINGS (1) (2) Absolute Maximum Supply Voltage 5.5V Power Dissipation ESD Susceptibility (3) See (4) 1.5 kV Sense Current (peak, for 200 msec) (5) 10A Sink Current for PWM pin 1mA Voltage on Pin 5 5.25V Maximum Junction Temperature 150°C −65°C to +150°C Storage Temperature Lead Temperature (Soldering, 10 sec) (1) (2) (3) (4) (5) 260°C If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specification Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. At elevated temperatures, devices must be derated based on package thermal resistance. The device in the surface-mount package must be derated at θJA= 150°C/W (typically), junction-to-ambient. The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The absolute maximum peak and continuous currents specified are not tested. These specifications are dependent on the θJA, which is 150°C/W for the D0008A package. OPERATING RATINGS (1) Input Voltage 2.0V to 5.25V Sense Current (continuous) (2) 7A −40°C to +125°C Junction Temperature Range (1) (2) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. The absolute maximum peak and continuous currents specified are not tested. These specifications are dependent on the θJA, which is 150°C/W for the D0008A package. ELECTRICAL CHARACTERISTICS LM3812-1.0, LM3813-1.0 VDD = 5.0V for the following specifications. Supply bypass capacitor is 1 µF and filter capacitor is 0.1 µF. Symbol IACC en (1) (2) (3) Parameter Average Current Accuracy Conditions (3) at 0.9A current Effective Output Noise (rms) Typ (1) Limit (2) Units 0.882 / 0.864 0.918 / 0.936 A A (min) A (max) 0.9 2 mA Typical numbers are at 25°C and represent the most likely parametric norm. Specifications in standard type face are for TJ= 25°C and those with boldface type apply over full operating temperature ranges. Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate Averaging Outgoing Quality Level (AOQL). There is a variation in accuracy over time due to thermal effects. Please refer to the PWM OUTPUT AND CURRENT ACCURACY section for more information. Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 3 LM3812, LM3813 SNOS028D – JUNE 1999 – REVISED APRIL 2013 www.ti.com LM3812-7.0, LM3813-7.0 VDD = 5.0V for the following specifications. Supply bypass capacitor is 1 µF and filter capacitor is 0.1 µF. Symbol IACC Average Current Accuracy en (1) (2) (3) (4) Parameter Conditions (3) at 2.5A current (4) Effective Output Noise (rms) Typ (1) Limit (2) Units 2.400 / 2.350 2.600 / 2.650 A A (min) A (max) 2.5 20 mA Typical numbers are at 25°C and represent the most likely parametric norm. Specifications in standard type face are for TJ= 25°C and those with boldface type apply over full operating temperature ranges. Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate Averaging Outgoing Quality Level (AOQL). There is a variation in accuracy over time due to thermal effects. Please refer to the PWM OUTPUT AND CURRENT ACCURACY section for more information. The PWM accuracy for LM3812-7.0 and LM3813-7.0 depends on the amount of copper area under pins 1 and 2, and the layout. Please refer to the PWM OUTPUT AND CURRENT ACCURACY section for more information. COMMON DEVICE PARAMETERS Unless otherwise specified, VDD = 5.0V for the following specifications. Supply bypass capacitor is 1 µF and filter capacitor is 0.1 µF. Symbol Parameter Conditions IQ1 Quiescent Current Normal Mode, SD = high IQ2 Quiescent Current Shutdown Mode, SD = low DRES PWM Resolution tS Sampling Time fP Frequency of PWM Waveform VTH Threshold High Level for SD VTL Threshold Low Level for SD VOH Logic High Level for PWM Load current = 1 mA, 2V ≤ VDD ≤ 5.25V VOL Logic Low Level for PWM Sink current = 1 mA, 2V ≤ VDD ≤ 5.25V PI Insertion Loss ISENSE = 1A Typ (1) Limit (2) Units 160 µA µA (max) 10 µA µA (max) 0.1 % 52 40 80 ms ms (min) ms (max) 12.5 25 Hz Hz (min) Hz (max) 1.8 V V (min) 0.7 V V (max) 100 2.5 20 (1) (2) (3) 4 1.2 1.3 (3) VDD − 0.05 VDD − 0.2 0.04 0.2 0.004 V V (min) V V (max) Ω Typical numbers are at 25°C and represent the most likely parametric norm. Specifications in standard type face are for TJ= 25°C and those with boldface type apply over full operating temperature ranges. Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate Averaging Outgoing Quality Level (AOQL). The tolerance of the internal lead frame resistor is corrected internally. The temperature coefficient of this resistor is 2600 ppm/°C. Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 LM3812, LM3813 www.ti.com SNOS028D – JUNE 1999 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS Supply bypass capacitor is 0.1 µF and filter capacitor is 0.1 µF. Measured Current vs Actual Current (LM3812-1.0 and LM3813-1.0) Measured Current vs Actual Current (LM3812-7.0 and LM3813-7.0) Figure 3. Figure 4. PWM Frequency vs Supply Voltage PWM Frequency vs Temperature Figure 5. Figure 6. Operating Current vs Supply Voltage Shutdown Current vs Supply Voltage Figure 7. Figure 8. Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 5 LM3812, LM3813 SNOS028D – JUNE 1999 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Supply bypass capacitor is 0.1 µF and filter capacitor is 0.1 µF. 6 Operating Current vs Temperature Shutdown Current vs Temperature Figure 9. Figure 10. Current vs Duty Cycle Accuracy vs Supply Voltage Figure 11. Figure 12. Accuracy vs Temperature (LM3812-1.0 and LM3813-1.0) Accuracy vs Temperature (LM3812-7.0 and LM3813-7.0) Figure 13. Figure 14. Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 LM3812, LM3813 www.ti.com SNOS028D – JUNE 1999 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Supply bypass capacitor is 0.1 µF and filter capacitor is 0.1 µF. Error vs Current (LM3812-1.0 and LM3813-1.0) Error vs Current (LM3812-7.0 and LM3813-7.0) Figure 15. Figure 16. These curves represent a statistical average such that the noise is insignificant. Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 7 LM3812, LM3813 SNOS028D – JUNE 1999 – REVISED APRIL 2013 www.ti.com TYPICAL APPLICATION CIRCUITS In the application circuits, the 0.1 µF ceramic capacitor between pins 1 and 8 is used for bypassing, and the 0.1 µF ceramic capacitor between pins 3 and 4 is used for filtering. Shutdown (SD) is tied to VDD through a 10 kΩ resistor. Figure 17. High Side Sense Figure 18. Low Side Sense 8 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 LM3812, LM3813 www.ti.com SNOS028D – JUNE 1999 – REVISED APRIL 2013 ITOTAL = 2.2(D1−0.5)IMAX + 2.2(D2−0.5)IMAX where D1 is the duty cycle of PWM1 and D2 is the duty cycle of PWM2. Figure 19. Paralleling LM3812 for Higher Load Current Please refer to the PRODUCT OPERATION section for more information. Figure 20. High Voltage Operation — VIN Greater Than 5.25V (High Side Sense) (PWM output is referred to Pin 7) Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 9 LM3812, LM3813 SNOS028D – JUNE 1999 – REVISED APRIL 2013 www.ti.com Figure 21. High Voltage Operation — VIN Greater Than 5.25V (Low Side Sense) 10 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 LM3812, LM3813 www.ti.com SNOS028D – JUNE 1999 – REVISED APRIL 2013 PRODUCT OPERATION The current is sampled by the delta-sigma modulator, as illustrated in Figure 22. The pulse density output of the delta-sigma modulator is digitally filtered. The digital output is then compared to the output of a digital ramp generator. This produces a PWM output. The duty cycle of the PWM output is proportional to the amount of current flowing. A duty cycle of 50% indicates zero current flow. If the current is flowing in positive direction, the duty cycle will be greater than 50%. Conversely, the duty cycle will be less than 50% for currents flowing in the negative direction. A duty cycle of 95.5% (4.5%) indicates the current is at IMAX (−IMAX). The IC can sense currents from −IMAX to +IMAX. Options for IMAX are 1A or 10A. The sense current is given by: ISENSE = 2.2 (D−0.5)(IMAX) where • • D is the duty cycle of the PWM waveform. IMAX is the full scale current (1A or 10A). (1) Similarly, the duty cycle is given by: D = [ISENSE/(2.2 IMAX)] + 0.5 (2) For quick reference, see the Conversion Tables in Table 1 and Table 2. The user should note that, while the LM3812-7.0/ LM3813-7.0 will read 10A full scale, it is rated for 10A operation for a duration of no more than 200 msec, and 7A operation continuously. In this IC, the current is averaged over 50 msec time slots. Hence, momentary current surges of less than 50 msec are tolerated. This is a sampled data system which requires an anti-aliasing filter, provided by the filter capacitor. The delta-sigma modulator converts the sensed current to the digital domain. This allows digital filtering, and provides immunity to current and noise spikes. This type of filtering would be difficult or impossible to accomplish on an IC with analog components. When ordering, the user has to specify whether the part is being used for low-side or high-side sense. The user also needs to specify the full scale value. Figure 22. Functional Block Diagram of LM3812 and LM3813 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 11 LM3812, LM3813 SNOS028D – JUNE 1999 – REVISED APRIL 2013 www.ti.com PWM OUTPUT AND CURRENT ACCURACY Offset The PWM output is quantized to 1024 levels. Therefore, the duty cycle can change only in increments of 1/1024. There is a one-half (0.5) quantization cycle delay in the output of the PWM circuitry. That is to say that instead of a duty cycle of N/1024, the duty cycle actually is (N+½)/1024. The quantization error can be corrected for if a more precise result is desired. To correct for this error, simply subtract 1/2048 from the measured duty cycle. The extra half cycle delay will show up as a DC offset of ½ bit if it is not corrected for. This is approximately 1.1 mA for 1 Amp parts, and 11 mA for 7 Amp parts. Jitter In addition to quantization, the duty cycle will contain some jitter. The jitter is quite small (for example, the standard deviation of jitter is only 0.1% for the LM3812/13-1.0). Statistically the jitter can cause an error in a current sample. Because the jitter is a random variable, the mean and standard deviation are used. The mean, or average value, of the jitter is zero. The standard deviation (0.1%) can be used to define the peak error caused from jitter. The “crest factor” has often been used to define the maximum error caused by jitter. The crest factor defines a limit within which 99.7% of the samples fall. The crest factor is defined as ±0.3% error in the duty cycle. Since the jitter is a random variable, averaging multiple outputs will reduce the effective jitter. Obeying statistical laws, the jitter is reduced by the square root of the number of readings that are averaged. For example, if four readings of the duty cycle are averaged, the resulting jitter (and crest factor) are reduced by a factor of two. Jitter and Noise Jitter in the PWM output appears as noise in the current measurement. The Electrical Characteristics show noise measured in current RMS (root mean square). Arbitrarily one could specify PWM jitter, as opposed to noise. In either case the effect results in a random error in an individual current measurement. Noise, just like jitter, can be reduced by averaging many readings. The RMS value of the noise corresponds to one standard deviation. The “crest factor” can be calculated in terms of current, and is equal to ±3 sigma (RMS value of the noise). Noise will also be reduced by averaging multiple readings, and follows the statistical laws of a random variable. Accuracy of 7A Versions The graph of Figure 23 shows two possible responses to a 7A current step. The flat response shows basically a 7A level with some noise. This is what is possible with a good thick trace and a good thermal connection to the IC on the sense pins. The second trace that asymptotically approaches a higher value shows what can happen under extremely poor thermal conditions. Here a very small wire connects the IC to the current source. The very small wire does not allow heat in the sense resistor to dissipate. Hence, as the sense resistor heats up, a temperature difference between the sense element and the die gets larger, and an error develops. Eventually the temperature difference reaches steady state, which accounts for the under-damped exponential response. 12 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 LM3812, LM3813 www.ti.com SNOS028D – JUNE 1999 – REVISED APRIL 2013 Figure 23. Transient Response to 7 Amp Step Current Accuracy Versus Noise The graph shown in Figure 24 illustrates the typical response of ±1 Ampere current gauges. In this graph, the horizontal axis indicates time, and the vertical axis indicates measured current (the PWM duty cycle has been converted to current). The graph was generated for an actual current of 500 mA. The difference between successive readings manifests itself as jitter in the PWM output or noise in the current measurement (when duty cycle of the PWM output is converted to current). The accuracy of the measurement depends on the noise in the current waveform. The accuracy can be improved by averaging several outputs. Although there is variation in successive readings, a very accurate measurement can be obtained by averaging the readings. For example, on averaging the readings shown in this example, the average current measurement is 502.3 mA (Figure 24). This value is very close to the actual value of 500 mA. Moreover, the accuracy depends on the number of readings that are averaged. Figure 24. Typical Response of LM3812-1.0/LM3813-1.0 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 13 LM3812, LM3813 SNOS028D – JUNE 1999 – REVISED APRIL 2013 www.ti.com LOOK-UP TABLES The following tables show how to convert the duty cycle of the PWM output to a current value, and vice versa. The quantization error of ½ bit is not shown in these tables. Please see the PWM OUTPUT AND CURRENT ACCURACY section for more details. Table 1. Current to Duty Cycle Conversion Table (1) 14 Sense Current (Amps) (1) Duty Cycle (%) Sense Current (Amps) (1) Duty Cycle (%) 1.00 95.5 -1.00 4.5 0.95 93.2 -0.95 6.8 0.90 90.9 -0.90 9.1 0.85 88.6 -0.85 11.4 0.80 86.4 -0.80 13.6 0.75 84.1 -0.75 15.9 0.70 81.8 -0.70 18.2 0.65 79.5 -0.65 20.5 0.60 77.3 -0.60 22.7 0.55 75.0 -0.55 25.0 0.50 72.7 -0.50 27.3 0.45 70.5 -0.45 29.5 0.40 68.2 -0.40 31.8 0.35 65.9 -0.35 34.1 0.30 63.6 -0.30 36.4 0.25 61.4 -0.25 38.6 0.20 59.1 -0.20 40.9 0.15 56.8 -0.15 43.2 0.10 54.5 -0.10 45.5 0.05 52.3 -0.05 47.7 0.00 50.0 -0.00 50.0 Maximum Sense Current = 1.0 Amps for LM3812-1.0 and LM3813-1.0. The sense current should be multiplied by 10 for LM3812-7.0 and LM3813-7.0. Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 LM3812, LM3813 www.ti.com SNOS028D – JUNE 1999 – REVISED APRIL 2013 Table 2. Duty Cycle to Current Conversion Table (1) Duty Cycle (%) Sense Current (Amps) (1) Duty Cycle (%) Sense Current (Amps) (1) 95.5 0.990 50.0 -0.000 92.5 0.935 47.5 -0.055 90.0 0.880 45.0 -0.110 87.5 0.825 42.5 -0.165 85.0 0.770 40.0 -0.220 82.5 0.715 37.5 -0.275 80.0 0.660 35.0 -0.330 77.5 0.605 32.5 -0.385 75.0 0.550 30.0 -0.440 72.5 0.495 27.5 -0.495 70.0 0.440 25.0 -0.550 67.5 0.385 22.5 -0.605 65.0 0.330 20.0 -0.660 62.5 0.275 17.5 -0.715 60.0 0.220 15.0 -0.770 57.5 0.165 12.5 -0.825 55.0 0.110 10.0 -0.880 52.5 0.055 7.5 -0.935 50.0 0.000 5.0 -0.990 Maximum Sense Current = 1.0 Amps for LM3812-1.0 and LM3813-1.0. The sense current should be multiplied by 10 for LM3812-7.0 and LM3813-7.0. TIMING DIAGRAM Duty cycle of the PWM waveform during any sampling interval indicates the current magnitude (average) and direction during the previous sampling interval. Figure 25. Typical Timing Diagram for Mostly Positive Current Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 15 LM3812, LM3813 SNOS028D – JUNE 1999 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision C (April 2013) to Revision D • 16 Page Changed layout of National Data Sheet to TI format .......................................................................................................... 15 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM3812 LM3813 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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