TP199A1T 3PEAK | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 9

Technical content

Features

 VOLTAGE OFFSET: ±100uV (MAX)  WIDE COMMON MODE VOLTAGE:-0.3V to +36V  SUPPLY VOLTAGE: 2.7V to +36V  ACCURACY and ZERO-DRIFT PERFORMANCE  ±1% Gain Error (Max over temperature)  0.5μV/°C Offset Drift (Max)  10ppm/° C Gain Drift (Max)  TWO GAIN OPTIONS for VOLTAGE OUTPUT  TP199A1T: 50V/V  TP199A2T: 100V/V  LOW SUPPLY CURRENT: 120uA (TYP)  Rail-to-Rail Output  PACKAGE: SC70-6  Industrial –40° C to 125° C Operation Range  ESD Rating: Robust 3KV – HBM, 2KV – CDM  Higher performance Drop -In Compatible With INA213, INA214, INA199, NCS199 Products

Applications

 CURRENT SENSING (High−Side/Low−Side)  BATTERY CHARGERS  POWER MANAGEMENT  CELL PHONE CHARGER  ELECTRICAL CIGIRATE  WIRELESS CHARGER  TELECOM EQUIPMENT

Description

The TP199 series of zero-drift, bi-directional current sense amplifier can sense voltage drops across shunts at common-mode voltages from –0.3V to 36V, independent of the supply voltage. Two fixed gains are available: 50V/V, and 100V/V. The low offset of the zero -drift architecture enables current sensing with maximum drops across the shunt as low as 10mV full-scale. TP199 devices operate from a single +2.7V to 36V power supply, with drawing a typical of 120uA of supply current. All versions are specified from –40° C +125° C, and offered in SC70-6 packages. GAIN OPTIONS TABLE PRODUCT GAIN R3 and R4 R1 and R2 TP199A1T 50 20kΩ 1MΩ TP199A2T 100 10kΩ 1MΩ 𝑉𝑂𝑈𝑇 = (𝐼𝐿𝑂𝐴𝐷 × 𝑅𝑆𝐻𝑈𝑁𝑇)𝐺𝐴𝐼𝑁 + 𝑉𝑅𝐸𝐹 Application schematic Supply Reference voltage REF GND V++2.7V to +36V CBYPASS 0.01µF to 0.1µF OUT IN- IN+ RSHUNT Load Output Pin Configuration TP199 6-Pin SC70 (-C Suffix) 1REF GND V+ IN+ OUT

5 IN-

Zero-Drift, Bi-directional Current Sense Amplifier Order Information Model Name Order Number Gain Package Transport Media, Quantity Package Marking TP199 TP199A1T-CR 50V/V 6-Pin SC70 Tape and Reel, 3,000 9A1 TP199A2T-CR 100V/V 6-Pin SC70 Tape and Reel, 3,000 9A2 Absolute Maximum Ratings Note 1 Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The op amp supplies must be established simultaneously, with, or before, the application of any input signals. Note 3: The inputs are protected by ESD protection diodes to each power supply. If the input extends more than 500mV beyond the power supply, the input current should be limited to less than 10mA. Note 4: A heat sink may be required to keep the junction t emperature below the absolute maximum. This depends on the power supply voltage and how many amplifiers are shorted. Thermal resistance varies with the amount of PC board metal connected to the package. The specified values are for short traces connected to the leads. ESD, Electrostatic Discharge Protection Thermal Resistance Package Type θJA θJC Unit 6-Pin SC70 227 80 ° C/W Symbol Parameter Condition Minimum Level Unit HBM Human Body Model ESD MIL-STD-883H Method 3015.8 ±3 kV CDM Charged Device Model ESD JEDEC-EIA/JESD22-C101E ±2 kV

Zero-Drift, Bi-directional Current Sense Amplifier

Electrical Characteristics

The specifications are at TA = 25° C, VSENSE = VIN+ – VIN–, VS = 5 V, VIN+ = 12V, and VREF = VS / 2, unless otherwise noted Symbol Parameter Conditions Min Typ Max Unit INPUT VOS Input Offset Voltage VSENSE = 0 mV ±5 ±100 uV VOS TC Input Offset Voltage Drift VSENSE = 0 mV, -40° C to 125° C 0.1 0.5 μV/° C VCM Common-mode Input Range -40° C to 125° C -0.3 36 V CMRR Common Mode Rejection Ratio VIN+ = 5~26 V, VSENSE = 0 mV, -40° C to 125° C 95 120 dB IB Input Bias Current VSENSE = 0 mV 35 uA IOS Input Offset Current VSENSE = 0 mV 0.4 uA PSRR Power Supply Rejection Ratio Vs = +2.7~18V, VIN+ = +18V, VSENSE = 0 mV ±1 uV/V NOISE RTINote 5 en Input Voltage Noise Density f = 1kHz 30 nV/√Hz OUTPUT G Gain TP199A1T 50 V/V TP199A2T 100 V/V EG Gain Error VSENSE = -5~5mV, -40° C to 125° C ± 0.1% ±1% EG TC Gain Error Vs Temperature -40° C to 125° C 3 10 ppm CLOAD Maxim capacitive load No oscillation 1 nF VOH Output Swing from Supply Rail RLOAD = 10kΩ to REF, -40° C to 125° C 0.02 0.05 V VOL Output Swing from Supply Rail RLOAD = 10kΩ to REF, -40° C to 125° C 0.01 0.05 V FREQUENCY RESPONSE BW Bandwidth CLOAD = 10pF, TP199A1T 48 kHz CLOAD = 10pF, TP199A2T 30 kHz SR Slew Rate 0.6 V/μs POWER SUPPLY V+ Supply Voltage 2.7 36 V IQ Quiescent Current VSENSE = 0 mV 120 145 μA TEMPERATURE RANGE Specified range -40 125 °C Operating range -55 150 °C Note 5: RTI = referred to input

Zero-Drift, Bi-directional Current Sense Amplifier measured on input voltage rails as high as 36 V while the device can be powered from supply voltages as low as 2.7 V. The zero -drift topology enables high -precision measurements with maximum input offset voltages as low as 60 μV with a maximum temperature contribution of 0.5 μV/°C over the full temperature range of –40° C to 125° C. Applications Information Application schematic Supply Reference voltage REF GND V++2.7V to +36V CBYPASS 0.01µF to 0.1µF OUT IN- IN+ RSHUNT Load Output Above figure shows the basic connections of the TP199. The input pins, IN+ and IN –, should be connected as closely as possible to the shunt resistor to minimize any resistance in series with the shunt resistor. Power-supply by pass capacitors are required for stability. Applications with noisy or high -impedance power supplies may require additional decoupling capacitors to reject power-supply noise. Connect bypass capacitors close to the device pins. Selecting RSHUNT The zero -drift offset performance of the TP199 offers several benefits. Most often, the primary advantage of the low offset characteristic enables lower full-scale drops across the shunt. For example, nonzero -drift current shunt monitors typically require a full-scale range of 100 mV. The TP199 family gives equivalent accuracy at a full -scale range on the order of 10 mV. This accuracy reduces shunt dissipation by an order of magnitude with many additional benefits. Alternatively, there are applications that must mea sure current over a wide dynamic range that can take advantage of the low offset on the low end of the measurement. Most often, these applications can use the lower gains of the TP199 to accommodate larger shunt drops on the upper end of the scale. For ins tance, an TP199A1 T operating on a 3.3 -V supply could easily handle a full-scale shunt drop of 60 mV, with only 100 uV of offset. REF Input Impedance Effects As with any difference amplifier, the TP199 family common -mode rejection ratio is affected by any i mpedance present at the REF input. This concern is not a problem when the REF pin is connected directly to most references or power supplies. When using resistive dividers from the power supply or a reference voltage, the REF pin should be buffered by an op amp. Power Supply Recommendation The input circuitry of the TP199 can accurately measure beyond its power -supply voltage, V+. For example, the V+ power

Zero-Drift, Bi-directional Current Sense Amplifier supply can be 5 V, whereas the load power-supply voltage can be as high as 36 V. However, the output voltage range of the OUT pin is limited by the voltages on the power-supply pin. Note also that the TP199 can withstand the full input signal range up to 36 V at the input pins, regardless of whether the device has power applied or not. Input Capacitance To ensure better performance about TP199, recommend to add 100nF capacitance between IN+ with GND and it should be close to the IN+ pin in PCB layout. Proper Board Layout To ensure optimum performance at the PCB level, care must be taken in the design of the board layout. To avoid leakage currents, the surface of the board should be kept clean and free of moisture. Coating the surface creates a barrier to moistu re accumulation and helps reduce parasitic resistance on the board. Keeping supply traces short and properly bypassing the power supplies minimizes power supply disturbances due to output current variation, such as when driving an ac signal into a heavy load. Bypass capacitors should be connected as closely as possible to the device supply pins. Stra y capacitances are a concern at the outputs and the inputs of the amplifier. It is recommended that signal traces be kept at least 5mm from supply lines to minimize coupling. A variation in temperature across the PCB can cause a mismatch in the Seebeck vol tages at solder joints and other points where dissimilar metals are in contact, resulting in thermal voltage errors. To minimize these thermocouple effects, orient resistors so heat sources warm both ends equally. Input signal paths should contain matching numbers and types of components, where possible to match the number and type of thermocouple junctions. For example, dummy components such as zero value resistors can be used to match real resistors in the opposite input path. Matching components should be located in close proximity and should be oriented in the same manner. Ensure leads are of equal length so that thermal conduction is in equilibrium. Keep heat sources on the PCB as far away from amplifier input circuitry as is practical. The use of a gro und plane is highly recommended. A ground plane reduces EMI noise and also helps to maintain a constant temperature across the circuit board.

Zero-Drift, Bi-directional Current Sense Amplifier Package Outline Dimensions SC70-6 /SOT-363 3PEAK and the 3PEAK logo are registered trademarks of 3PEAK INCORPORATED. All other trademarks are the property of their respective owners. Symbol Inches Millimeters MIN MAX MIN MAX A 0.031 0.039 0.80 1.00 A1 0.001 0.004 0.025 0.10 A2 0.034 0.036 0.85 0.90 b 0.006 0.012 0.15 0.30 b1 0.006 0.010 0.15 0.25 c 0.004 0.008 0.10 0.20 c1 0.004 0.006 0.10 0.15 D 0.073 0.085 1.85 2.15 E 0.084BSC 2.1BSC - E1 0.045 0.053 1.15 1.35 e 0.0256Ref 0.65 Ref e1 0.0512Ref 1.30 Ref L 0.010 0.018 0.26 0.46 L1 0.016 Ref 04.00 Ref - L2 0.006 BSC 0.15 BSC - N 6 6 R 0.04 - 0.10 -  0o 8o 0o 8o