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MAX4080TASA+

MAX4080TASA+

  • 厂商:

    AD(亚德诺)

  • 封装:

    SOIC-8_4.9X3.9MM

  • 描述:

    电流检测 放大器 1 电路 8-SOIC

  • 数据手册
  • 价格&库存
MAX4080TASA+ 数据手册
EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output General Description The MAX4080/MAX4081 are high-side, current-sense amplifiers with an input voltage range that extends from 4.5V to 76V making them ideal for telecom, automotive, backplane, and other systems where high-voltage current monitoring is critical. The MAX4080 is designed for unidirectional current-sense applications and the MAX4081 allows bidirectional current sensing. The MAX4081 single output pin continuously monitors the transition from charge to discharge and avoids the need for a separate polarity output. The MAX4081 requires an external reference to set the zero-current output level (VSENSE = 0V). The charging current is represented by an output voltage from VREF to VCC, while discharge current is given from VREF to GND. For maximum versatility, the 76V input voltage range applies independently to both supply voltage (VCC) and common-mode input voltage (VRS+). High-side current monitoring does not interfere with the ground path of the load being measured, making the MAX4080/MAX4081 particularly useful in a wide range of high-voltage systems. The combination of three gain versions (5V/V, 20V/V, 60V/V = F, T, S suffix) and a user-selectable, external sense resistor sets the full-scale current reading and its proportional output voltage. The MAX4080/MAX4081 offer a high level of integration, resulting in a simple, accurate, and compact current-sense solution. The MAX4080/MAX4081 operate from a 4.5V to 76V single supply and draw only 75µA of supply current. These devices are specified over the automotive operating temperature range (-40°C to +125°C) and are available in a space-saving 8-pin µMAX® or SO package. Applications ● Automotive (12V, 24V, or 42V Batteries) ● 48V Telecom and Backplane Current Measurement ● Bidirectional Motor Control ● Power-Management Systems ● Avalanche Photodiode and PIN-Diode Current Monitoring ● General System/Board-Level Current Sensing ● Precision High-Voltage Current Sources µMAX is a registered trademark of Maxim Integrated Products, Inc. 19-2562; Rev 6; 12/20 Benefits and Features ● Ideal for High-Voltage Current Monitoring Applications • Wide 4.5V to 76V Input Common-Mode Range • Independent Operating Supply Voltage ● High Accuracy and Low Quiescent Current Support Precision Application Requirements • ±0.1% Full-Scale Accuracy • Low 100μV Input Offset Voltage • Three Gain Versions Available - 5V/V (MAX4080F/MAX4081F) - 20V/V (MAX4080T/MAX4081T) - 60V/V (MAX4080S/MAX4081S) • 75μA Supply Current (MAX4080) ● Flexible Current Sensing Supports Monitoring of Charge and Discharge of Batteries • Bidirectional (MAX4081) or Unidirectional (MAX4080) ISENSE • Reference Input for Bidirectional OUT (MAX4081) ● Minimizes Required Board Space • 8-Pin μMAX Package Ordering Information TEMP RANGE PIN-PACKAGE MAX4080FAUA+ PART -40°C to +125°C 8 µMAX MAX4080FAUA/V+ -40°C to +125°C 8 µMAX MAX4080FASA+ -40°C to +125°C 8 SO MAX4080TAUA+ -40°C to +125°C 8 µMAX MAX4080TAUA/V+ -40°C to +125°C 8 µMAX +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. Ordering Information continued at end of data sheet. Selector Guide appears at end of data sheet. Pin Configurations TOP VIEW RS+ 1 VCC 2 + 8 RS- RS+ 1 + 8 RS- 7 N.C. VCC 2 7 REF1A 3 6 N.C. N.C. 3 6 REF1B GND 4 5 OUT GND 4 5 OUT N.C. MAX4080 µMAX/SO MAX4081 µMAX/SO MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output Absolute Maximum Ratings VCC to GND...........................................................-0.3V to +80V RS+, RS- to GND...................................................-0.3V to +80V OUT to GND........... -0.3V to the lesser of +18V or (VCC + 0.3V) REF1A, REF1B to GND (MAX4081 Only).-0.3V to the lesser of +18V or (VCC + 0.3V) Output Short Circuit to GND......................................Continuous Differential Input Voltage (VRS+ - VRS-)...............................±80V Current into Any Pin..........................................................±20mA Continuous Power Dissipation (TA = +70°C) 8-Pin ?MAX (derate 4.5mW/°C above +70°C).............362mW 8-Pin SO (derate 5.88mW/°C above +70°C)................471mW Operating Temperature Range.......................... -40°C to +125°C Junction Temperature.......................................................+150°C Storage Temperature Range............................. -65°C to +150°C Lead Temperature (soldering, 10s).................................. +300°C Soldering Temperature (reflow)........................................+260°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC Electrical Characteristics (VCC = VRS+ = 4.5V to 76V, VREF1A = VREF1B = 5V (MAX4081 only), VSENSE = (VRS+ - VRS-) = 0V, RLOAD = 100kΩ, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2) PARAMETER Operating Voltage Range Common-Mode Range Supply Current SYMBOL MAX UNITS Inferred from PSRR test 4.5 76 V CMVR Inferred from CMRR test (Note 3) 4.5 76 V ICC VCC = VRS+ = 76V, MAX4080 no load MAX4081 75 190 103 190 0.01 2 µA 5 12 µA VCC CONDITIONS Leakage Current IRS+, IRS- VCC = 0V, VRS+ = 76V Input Bias Current IRS+, IRS- VCC = VRS+ = 76V Full-Scale Sense Voltage (Note 4) Gain Gain Accuracy Input Offset Voltage VSENSE AV DAV VOS MIN TYP MAX4080F/MAX4081F ±1000 MAX4080T/MAX4081T ±250 MAX4080S/MAX4081S ±100 MAX4080F/MAX4081F 5 MAX4080T/MAX4081T 20 MAX4080S/MAX4081S 60 VCC = VRS+ = 48V (Note 5) VCC = VRS+ = 48V (Note 6) TA = +25°C µA mV V/V ±0.1 TA = -40°C to +85°C ±0.6 ±1 TA = TMIN to TMAX % ±1.2 TA = +25°C ±0.1 TA = -40°C to +85°C ±0.6 ±1 TA = TMIN to TMAX mV ±1.2 Common-Mode Rejection Ratio (Note 7) CMRR VCC = 48V, VRS+ = 4.5V to 76V 100 124 dB Power-Supply Rejection Ratio (Note 7) PSRR VRS+ = 48V, VCC = 4.5V to 76V 100 122 dB (VCC – VOH) VCC = 4.5V, VRS+ = 48V, VREF1A = VREF1B = 2.5V, IOUT (sourcing) = +500µA (Note 8) OUT High Voltage www.maximintegrated.com MAX4080F/MAX4081F, VSENSE = 1000mV MAX4080T/MAX4081T, VSENSE = 250mV 0.15 0.27 V MAX4080S/MAX4081S, VSENSE = 100mV Maxim Integrated │  2 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output DC Electrical Characteristics (continued) (VCC = VRS+ = 4.5V to 76V, VREF1A = VREF1B = 5V (MAX4081 only), VSENSE = (VRS+ - VRS-) = 0V, RLOAD = 100kΩ, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2) PARAMETER OUT Low Voltage REF1A = REF1B Input Voltage Range (MAX4081 Only) REF1A Input Voltage Range (MAX4081 Only) SYMBOL CONDITIONS VOL VCC = VRS+ = 48V, IOUT (sinking) = 10µA VREF1A = VREF1B = 2.5V, VSENSE = -1000mV (for IOUT (sinking) = 100µA MAX4081 only) (VREF – VGND) Inferred from REF1A rejection ratio, VREF1A = VREF1B (VREF1A – Inferred from REF1A rejection ratio, VGND) VREF1B = VGND MIN TYP MAX 4 15 23 55 1.5 6 V 3 12 V REF1A Rejection Ratio (MAX4081 Only) VCC = VRS+ = 48V, VSENSE = 0V, VREF1A = VREF1B = 1.5V to 6V 80 108 REF/REF1A Ratio (MAX4081 Only) VREF1A = 10V, VREF1B = VGND, VCC = VRS+ = 48V (Note 2) 0.497 0.500 REF1A Input Impedance (MAX4081 Only) VREF1B = VGND www.maximintegrated.com UNITS 250 dB 0.503 kW Maxim Integrated │  3 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output AC Electrical Characteristics (VCC = VRS+ = 4.5V to 76V, VREF1A = VREF1B = 5V (MAX4081 only), VSENSE = (VRS+ - VRS-) = 0V, RLOAD = 100kΩ, CLOAD = 20pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS VCC = VRS+ = 48V, MAX4080F/T/S VOUT = 2.5V MAX4081F/T/S 250 VSENSE = 10mV to 100mV 20 VSENSE = 100mV to 10mV 20 No sustained oscillations 500 pF VSENSE = 100mV 0.1 W Power-Up Time VCC = VRS+ = 48V, VSENSE = 100mV (Note 9) 50 µs Saturation Recovery Time (Notes 9,10) 50 µs Bandwidth BW OUT Settling Time to 1% of Final Value Capacitive-Load Stability Output Resistance ROUT 150 kHz µs Note 1: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design. Note 2: VREF is defined as the average voltage of VREF1A and VREF1B. REF1B is usually connected to REF1A or GND. VSENSE is defined as VRS+ - VRS-. Note 3: The common-mode range at the low end of 4.5V applies to the most positive potential at RS+ or RS-. Depending on the polarity of VSENSE and the device’s gain, either RS+ or RS- can extend below 4.5V by the device’s typical full-scale value of VSENSE. Note 4: Negative VSENSE applies to MAX4081 only. Note 5: VSENSE is: MAX4080F, 10mV to 1000mV MAX4080T, 10mV to 250mV MAX4080S, 10mV to 100mV MAX4081F, -500mV to +500mV MAX4081T, -125mV to +125mV MAX4081S, -50mV to +50mV Note 6: VOS is extrapolated from the gain accuracy test for the MAX4080 and measured as (VOUT - VREF)/AV at VSENSE = 0V, for the MAX4081. Note 7: VSENSE is: MAX4080F, 500mV MAX4080T, 125mV MAX4080S, 50mV MAX4081F/T/S, 0V VREF1B = VREF1A = 2.5V Note 8: Output voltage is internally clamped not to exceed 18V. Note 9: Output settles to within 1% of final value. Note 10: The device will not experience phase reversal when overdriven. www.maximintegrated.com Maxim Integrated │  4 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output Typical Operating Characteristics (VCC = VRS+ = 48V, VSENSE = 0V, CLOAD = 20pF, RLOAD = ∞, TA = +25°C, unless otherwise noted.) 5 -250 -300 -125 -100 -75 -50 -25 0 25 50 75 100 125 -50 -25 0 T VERSION -0.10 -0.15 F VERSION 4 28 40 52 64 76 10 100 1k 10k 100k MAX4080 toc03 0 25 50 75 100 125 1M 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 MAX4081F/T/S POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) MAX4081F/T/S REFERENCE REJECTION RATIO vs. FREQUENCY MAX4080F/T/S SMALL-SIGNAL GAIN vs. FREQUENCY MAX4081F/T/S SMALL-SIGNAL GAIN vs. FREQUENCY -20 50 VSENSE = 10mV 45 40 -30 -40 MAX4080S 35 GAIN (dB) -50 -60 -70 -80 -90 30 20 MAX4080F 10 100 1k FREQUENCY (Hz) www.maximintegrated.com 10k 100k VOUT = 100mVP-P 45 40 MAX4081S 30 MAX4081T 25 20 MAX4081F 15 10 -100 -110 50 35 MAX4080T 25 15 1 -25 TEMPERATURE (°C) MAX4081F/T/S COMMON-MODE REJECTION RATIO vs. FREQUENCY 1 -50 FREQUENCY (Hz) -10 -120 75 100 125 150 TEMPERATURE (°C) VCC (V) MAX4080 toc07 REFERENCE REJECTION RATIO (dB) 0 16 -0.2 MAX4080 toc09 -0.20 0 -0.1 -0.5 50 GAIN (dB) GAIN ACCURACY (%) S VERSION -0.05 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 25 MAX4080 toc05 VRS+ = 48V COMMON-MODE REJECTION RATIO (dB) MAX4080 toc04 GAIN ACCURACY vs. VCC 0.1 -0.4 INPUT OFFSET VOLTAGE (µV) 0 0.2 -0.3 MAX4080 toc08 0 50 0 -50 -100 -150 -200 10 0.3 MAX4080 toc06 15 0.4 GAIN ACCURACY (%) 20 200 150 100 POWER-SUPPLY REJECTION RATIO (dB) 25 0.5 MAX4080 toc02 30 GAIN ACCURACY vs. TEMPERATURE 300 250 INPUT OFFSET VOLTAGE (V) MAX4080 toc01 35 PERCENTAGE (%) INPUT OFFSET VOLTAGE vs. TEMPERATURE INPUT OFFSET VOLTAGE HISTOGRAM 10 5 5 0 0 0.1 1 10 FREQUENCY (kHz) 100 1000 0.1 1 10 100 1000 FREQUENCY (kHz) Maxim Integrated │  5 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output Typical Operating Characteristics (continued) (VCC = VRS+ = 48V, VSENSE = 0V, CLOAD = 20pF, RLOAD = ∞, TA = +25°C, unless otherwise noted.) 70 65 110 105 100 95 28 40 52 64 4 16 28 40 52 VCC (V) MAX4081 SUPPLY CURRENT vs. TEMPERATURE VOUT HIGH VOLTAGE vs. IOUT (SOURCING) 105 100 95 90 85 80 75 70 -50 -25 0 25 50 75 100 125 0.50 VOUT HIGH VOLTAGE (VCC - VOH) (V) MAX4080 toc13 VCC (V) VREF1A = VREF1B = 2.5V 110 76 64 0.40 95 90 85 80 0.30 TA = +85°C 0.25 TA = +25°C 0.20 0.15 TA = 0°C TA = -40°C 0.05 0 25 50 0 75 100 125 VOUT LOW VOLTAGE vs. IOUT (SINKING) 300 VCC = 4.5V 250 200 TA = +125°C 150 TA = +85°C 100 TA = +25°C 0 TA = -40°C 0 TA = 0°C 50 100 150 200 250 300 350 400 450 500 IOUT (SINKING) (µA) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 IOUT (SOURCING) (mA) MAX4080T SMALL-SIGNAL TRANSIENT RESPONSE MAX4080 toc16 MAX4080S SMALL-SIGNAL TRANSIENT RESPONSE MAX4080 toc17 MAX4080 toc18 INPUT 5mV/div INPUT 5mV/div INPUT 5mV/div OUTPUT 25mV/div OUTPUT 100mV/div OUTPUT 300mV/div www.maximintegrated.com -25 50 0.10 MAX4080F SMALL-SIGNAL TRANSIENT RESPONSE 20µs/div -50 TEMPERATURE (°C) TA = +125°C 0.35 TEMPERATURE (°C) 100 65 76 VCC = 4.5V 0.45 0 105 70 VOUT LOW VOLTAGE (mV) 16 85 MAX4080 toc12 110 75 MAX4080 toc14 4 115 SUPPLY CURRENT (µA) 115 115 90 60 65 VREF = 2.5V NO LOAD VSENSE = 0V 120 MAX4080 toc15 75 MAX4080 SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT (µA) 80 125 MAX4080 toc10 NO LOAD VSENSE = 0V SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 85 MAX4081 SUPPLY CURRENT vs. VCC MAX4080 toc11 MAX4080 SUPPLY CURRENT vs. VCC 20µs/div 20µs/div Maxim Integrated │  6 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output Typical Operating Characteristics (continued) (VCC = VRS+ = 48V, VSENSE = 0V, CLOAD = 20pF, RLOAD = ∞, TA = +25°C, unless otherwise noted.) MAX4081F SMALL-SIGNAL TRANSIENT RESPONSE MAX4081S SMALL-SIGNAL TRANSIENT RESPONSE MAX4081T SMALL-SIGNAL TRANSIENT RESPONSE MAX4080 toc19 MAX4080 toc21 MAX4080 toc20 INPUT 10mV/div INPUT 2.5mV/div INPUT 1mV/div OUTPUT 50mV/div OUTPUT 50mV/div OUTPUT 50mV/div 20µs/div 20µs/div 20µs/div MAX4080F LARGE-SIGNAL TRANSIENT RESPONSE MAX4080T LARGE-SIGNAL TRANSIENT RESPONSE MAX4080 toc22 MAX4080S LARGE-SIGNAL TRANSIENT RESPONSE MAX4080 toc23 MAX4080 toc24 INPUT 400mV/div INPUT 100mV/div INPUT 33mV/div OUTPUT 2V/div OUTPUT 2V/div OUTPUT 2V/div 20µs/div 20µs/div MAX4081F LARGE-SIGNAL TRANSIENT RESPONSE 20µs/div MAX4081S LARGE-SIGNAL TRANSIENT RESPONSE MAX4081T LARGE-SIGNAL TRANSIENT RESPONSE MAX4080 toc25 MAX4080 toc27 MAX4080 toc26 INPUT 400mV/div INPUT 100mV/div INPUT 33mV/div OUTPUT 2V/div OUTPUT 2V/div OUTPUT 2V/div 20µs/div www.maximintegrated.com 20µs/div 20µs/div Maxim Integrated │  7 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output Typical Operating Characteristics (continued) (VCC = VRS+ = 48V, VSENSE = 0V, CLOAD = 20pF, RLOAD = ∞, TA = +25°C, unless otherwise noted.) MAX4080F SATURATION RECOVERY RESPONSE (VCC = 4.5V) VCC-TRANSIENT RESPONSE MAX4080 toc28 VRS+ = 20V VCC = 40V VCC = 20V STEP VREF1 = VREF2 = 2.5V MAX4080 toc29 VCC 5V/div INPUT 500mV/div VCC (0 TO 10V) 5V/div OUTPUT 2V/div OUTPUT 2.5V/div VCC = 20V VOUT 1V/div 4µs/div www.maximintegrated.com MAX4080T STARTUP DELAY (VSENSE = 250mV) 20µs/div MAX4080 toc30 100µs/div Maxim Integrated │  8 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output Pin Description PIN NAME FUNCTION MAX4080 MAX4081 1 1 RS+ Power connection to the external-sense resistor. 2 2 VCC Supply Voltage Input. Decouple VCC to GND with at least a 0.1µF capacitor to bypass line transients. 3, 6, 7 3 N.C. No Connection. No internal connection. Leave open or connect to ground. 4 4 GND Ground 5 5 OUT Voltage Output. For the unidirectional MAX4080, VOUT is proportional to VSENSE. For the bidirectional MAX4081, the difference voltage (VOUT - VREF) is proportional to VSENSE and indicates the correct polarity. 8 8 RS- Load connection to the external sense resistor. — 6 REF1B Reference Voltage Input: Connect REF1B to REF1A or to GND (see the External Reference section). — 7 REF1A Reference Voltage Input: Connect REF1A and REF1B to a fixed reference voltage (VREF). VOUT is equal to VREF when VSENSE is zero (see the External Reference section). Detailed Description The MAX4080/MAX4081 unidirectional and bidirectional high-side, current-sense amplifiers feature a 4.5V to 76V input common-mode range that is independent of supply voltage. This feature allows the monitoring of current out of a battery as low as 4.5V and also enables high-side current sensing at voltages greater than the supply voltage (VCC). The MAX4080/MAX4081 monitors current through a current-sense resistor and amplifies the voltage across the resistor. The MAX4080 senses current unidirectionally, while the MAX4081 senses current bidirectionally. The 76V input voltage range of the MAX4080/MAX4081 applies independently to both supply voltage (VCC) and common-mode, input-sense voltage (VRS+). High-side current monitoring does not interfere with the ground path of the load being measured, making the MAX4080/ MAX4081 particularly useful in a wide range of high-voltage systems. Battery-powered systems require a precise bidirectional current-sense amplifier to accurately monitor the battery’s charge and discharge. The MAX4081 charging current is represented by an output voltage from VREF to VCC, while discharge current is given from VREF to GND. Measurements of OUT with respect to VREF yield a positive and negative voltage during charge and discharge, as illustrated in Figure 1 for the MAX4081T. www.maximintegrated.com Current Monitoring The MAX4080 operates as follows: current from the source flows through RSENSE to the load (Figure 2), creating a sense voltage, VSENSE. Since the internal-sense amplifier’s inverting input has high impedance, negligible current flows through RG2 (neglecting the input bias current). Therefore, the sense amplifier’s inverting input voltage equals VSOURCE - (ILOAD)(RSENSE). The amplifier’s open-loop gain forces its noninverting input to the same voltage as the inverting input. Therefore, the drop across RG1 equals VSENSE. The internal current mirror multiplies IRG1 by a current gain factor, β, to give IA2 = β × IRG1. Amplifier A2 is used to convert the output current to a voltage and then sent through amplifier A3. Total gain = 5V/V for MAX4080F, 20V/V for the MAX4080T, and 60V/V for the MAX4080S. The MAX4081 input stage differs slightly from the MAX4080 (Figure 3). Its topology allows for monitoring of bidirectional currents through the sense resistor. When current flows from RS+ to RS-, the MAX4081 matches the voltage drop across the external sense resistor, RSENSE, by increasing the current through the Q1 and RG1. In this way, the voltages at the input terminals of the internal amplifier A1 are kept constant and an accurate measurement of the sense voltage is achieved. In the following amplifier stages of the MAX4081, the output signal of amplifier A2 is level- shifted to the reference voltage (VREF = VREF1A = VREF1B), resulting in a voltage at the output pin (OUT) Maxim Integrated │  9 MAX4080/MAX4081 ILOAD ICHARGE VSENSE RSENSE RS- 10V SYSTEM LOAD AND CHARGER 5V RS+ CHARGE CURRENT VOUT - VREF 4.5V TO 76V BATTERY 76V, High-Side, Current-Sense Amplifiers with Voltage Output VOUT = 10V VCC VSENSE MAX4081T REF1A -250mV 250mV 5V REF1B GND OUT -5V VOUT = VGND VREF1A = VREF1B = 5V DISCHARGE CURRENT Figure 1. MAX4081T OUT Transfer Curve VSENSE VSENSE ILOAD RS+ RS- RG1 RG2 RSENSE RS+ RS- RG1 RG2 MAX4081 RF A1 MAX4080 A1 Q1 Q2 CURRENT MIRROR CURRENT MIRROR Q1 CURRENT MIRROR IA2 A2 A3 OUT A2 125kΩ OUT REF1B 125kΩ REF1A VREF GND Figure 2. MAX4080 Functional Diagram Figure 3. MAX4081 Functional Diagram that swings above VREF voltage for positive-sense voltages and below VREF for negative-sense voltages. VOUT is equal to VREF when VSENSE is equal to zero. Note: For Gain = 5 (F), RG1 = RG2 = 160k. For Gain = 20 (T), RG1 = RG2 = 60k. For Gain = 60 (S), RG1 = RG2 = 20k. Set the full-scale output range by selecting RSENSE and the appropriate gain version of the MAX4080/ MAX4081. www.maximintegrated.com Maxim Integrated │  10 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output Table 1. Typical Component Values FULL-SCALE LOAD CURRENT, ILOAD (A) CURRENT-SENSE RESISTOR (mW) GAIN (V/V) FULL-SCALE VSENSE (mV) MAX4081 FULL-SCALE OUTPUT VOLTAGE (VOUT - VREF, V) 0.500 1000 5 ±500 ±2.5 0.125 1000 20 ±125 ±2.5 0.050 1000 60 ±50 ±3.0 5.000 100 5 ±500 ±2.5 1.250 100 20 ±125 ±2.5 0.500 100 60 ±50 ±3.0 50.000 10 5 ±500 ±2.5 12.500 10 20 ±125 ±2.5 5.000 10 60 ±50 ±3.0 FULL-SCALE LOAD CURRENT, ILOAD (A) CURRENT-SENSE RESISTOR (mW) GAIN (V/V) FULL-SCALE VSENSE (mV) MAX4080 FULL-SCALE OUTPUT VOLTAGE (V) 1.000 1000 5 1000 5.0 0.250 1000 20 250 5.0 0.100 1000 60 100 6.0 10.000 100 5 1000 5.0 2.500 100 20 250 5.0 1.000 100 60 100 6.0 50.000 10 5 500 2.5 25.000 10 20 250 5.0 10.000 10 60 100 6.0 External References (MAX4081) For the bidirectional MAX4081, the VOUT reference level is controlled by REF1A and REF1B. VREF is defined as the average voltage of VREF1A and VREF1B. Connect REF1A and REF1B to a low-noise, regulated voltage source to set the output reference level. In this mode, VOUT equals VREF1A when VSENSE equals zero (see Figure 4). Alternatively, connect REF1B to ground, and REF1A to a low-noise, regulated voltage source. In this case, the output reference level (VREF) is equal to VREF1A divided by two. VOUT equals VREF1A/2 when VSENSE equals zero. In either mode, the output swings above the reference voltage for positive current-sensing (VRS+ > VRS-). The output swings below the reference voltage for negative current-sensing (VRS+ < VRS-). www.maximintegrated.com Applications Information Recommended Component Values Ideally, the maximum load current develops the full-scale sense voltage across the current-sense resistor. Choose the gain needed to yield the maximum output voltage required for the application: VOUT = VSENSE 5 AV where VSENSE is the full-scale sense voltage, 1000mV for gain of 5V/V, 250mV for gain of 20V/V, 100mV for gain of 60V/V, and AV is the gain of the device. In applications monitoring a high current, ensure that RSENSE is able to dissipate its own I2R loss. If the resistor’s power dissipation is exceeded, its value may drift or it may fail altogether. The MAX4080/MAX4081 sense a wide variety of currents with different sense-resistor values. Table 1 lists common resistor values for typical operation. Maxim Integrated │  11 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output ILOAD = 0 ILOAD = 0 RSENSE RS+ VCC RS- RSENSE LOAD RS+ VCC REF1A MAX4081 5V OUT LOAD REF1A 10V MAX4081 REF1B REF1B GND RS- 5V GND OUT 5V Figure 4. MAX4081 Reference Inputs The full-scale output voltage is VOUT = RSENSE × ILOAD (MAX) × AV, for the MAX4080 and VOUT = VREF ± RSENSE × ILOAD(MAX) × AV for the MAX4081. VSENSE(MAX) is 1000mV for the 5V/V gain version, 250mV for the 20V/V gain version, and 100mV for the 60V/V gain version. Because of the high currents that flow through RSENSE, take care to eliminate parasitic trace resistance from causing errors in the sense voltage. Either use a four-terminal current-sense resistor or use Kelvin (force and sense) PC board layout techniques. Choosing the Sense Resistor Dynamic Range Consideration Choose RSENSE based on the following criteria: Voltage Loss: A high RSENSE value causes the power-source voltage to degrade through IR loss. For minimal voltage loss, use the lowest RSENSE value. ● Accuracy: A high RSENSE value allows lower currents to be measured more accurately. This is due to offsets becoming less significant when the sense voltage is larger. For best performance, select RSENSE to provide approximately 1000mV (gain of 5V/V), 250mV (gain of 20V/V), or 100mV (gain of 60V/V) of sense voltage for the full-scale current in each application. ● Efficiency and Power Dissipation: At high current levels, the I2R losses in RSENSE can be significant. Take this into consideration when choosing the resistor value and its power dissipation (wattage) rating. Also, the sense resistor’s value might drift if it is allowed to heat up excessively. ● Inductance: Keep inductance low if ISENSE has a large high-frequency component. Wire-wound resistors have the highest inductance, while metal film is somewhat better. Low-inductance, metal-film resistors are also available. Instead of being spiral- wrapped around a core, as in metal-film or wire-wound resistors, they are a straight band of metal and are available in values under 1Ω. www.maximintegrated.com Although the MAX4081 have fully symmetrical bidirectional VSENSE input capability, the output voltage range is usually higher from REF to VCC and lower from REF to GND (unless the supply voltage is at the lowest end of the operating range). Therefore, the user must consider the dynamic range of current monitored in both directions and choose the supply voltage and the reference voltage (REF) to make sure the output swing above and below REF is adequate to handle the swings without clipping or running out of headroom. Power-Supply Bypassing and Grounding For most applications, bypass VCC to GND with a 0.1µF ceramic capacitor. In many applications, VCC can be connected to one of the current monitor terminals (RS+ or RS-). Because VCC is independent of the monitored voltage, VCC can be connected to a separate regulated supply. If VCC will be subject to fast-line transients, a series resistor can be added to the power-supply line of the MAX4080/MAX4081 to minimize output disturbance. This resistance and the decoupling capacitor reduce the rise time of the transient. For most applications, 1kΩ in conjunction with a 0.1µF bypass capacitor work well. The MAX4080/MAX4081 require no special considerations with respect to layout or grounding. Consideration should be given to minimizing errors due to the large charge and discharge currents in the system. Maxim Integrated │  12 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output Power Management The bidirectional capability of the MAX4081 makes it an excellent candidate for use in smart battery packs. In the application diagram (Figure 5), the MAX4081 monitors the charging current into the battery as well as the discharge current out of the battery. The microcontroller stores this information, allowing the system to query the battery’s status as needed to make system power-management decisions. Typical Operating Circuit ISENSE VCC = 4.5V TO 76V RS+ RS- VCC MAX4080 OUT GND RSENSE RS+ SYSTEM LOAD RSENSE RS- VCC MAX4081 REF1A Chip Information GND REF1B SYSTEM POWER MANAGEMENT AND CHARGER CIRCUITRY OUT PROCESS: Bipolar 1.8V BATTERY Ordering Information (continued) PART PIN-PACKAGE -40°C to +125°C 8 SO MAX4080SAUA+ -40°C to +125°C 8 µMAX MAX4080SAUA/V+ -40°C to +125°C 8 µMAX MAX4080SASA+ -40°C to +125°C 8 SO Figure 5. MAX4081 Used In Smart-Battery Application MAX4081FAUA+ -40°C to +125°C 8 µMAX MAX4081FASA+ -40°C to +125°C 8 SO Selector Guide MAX4081TAUA+ -40°C to +125°C 8 µMAX MAX4081TASA+ -40°C to +125°C 8 SO MAX4081SAUA+ -40°C to +125°C 8 µMAX MAX1243 ADC TEMP RANGE MAX4080TASA+ SERIAL INTERFACE µC PART GAIN (V/V) I SENSE MAX4080FAUA 5 Unidirectional MAX4080FASA 5 Unidirectional MAX4080TAUA 20 Unidirectional MAX4080TASA 20 Unidirectional MAX4080SAUA 60 Unidirectional MAX4080SASA 60 Unidirectional MAX4081FAUA 5 Bidirectional MAX4081FASA 5 Bidirectional MAX4081TAUA 20 Bidirectional MAX4081TASA 20 Bidirectional MAX4081SAUA 60 Bidirectional MAX4081SASA 60 Bidirectional www.maximintegrated.com MAX4081SASA+ -40°C to +125°C 8 SO +Denotes a lead(Pb)-free/RoHS-compliant package. Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 8 µMAX U8+1 21-0036 90-0092 8 SO S8+2 21-0041 90-0096 Maxim Integrated │  13 MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 10/02 Initial release — 1 11/08 Added values for RG1 and RG2 10 2 5/09 Added lead-free and automotive parts to Ordering Information 1 3 5/10 Removed automotive part and added soldering temperature 4 7/11 Added automotive part designation 1 5 5/15 Updated Benefits and Features section 1 6 12/20 Updated Package Information section 13 DESCRIPTION 1, 2 For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2020 Maxim Integrated Products, Inc. │ 14
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MAX4080TASA+
  •  国内价格
  • 1+43.23606
  • 10+26.92169
  • 25+25.29618
  • 100+23.67068
  • 300+20.94173
  • 500+19.66031
  • 2500+19.00773
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库存:208

MAX4080TASA+
  •  国内价格 香港价格
  • 1+46.333801+5.56660
  • 10+28.1716010+3.38460
  • 100+25.01070100+3.00480
  • 200+22.12590200+2.65830
  • 500+20.77120500+2.49550
  • 1000+18.513501000+2.22430
  • 2000+18.237502000+2.19110
  • 5000+17.786005000+2.13690

库存:11844