FAN4010 High-Side Current Sensor Features at +5V Description ■ Low cost, accurate, high-side current sensing The FAN4010 is a high-side current sense amplifier designed for battery-powered systems. Using the FAN4010 for high-side power-line monitoring does not interfere with the battery charger’s ground path. The FAN4010 is designed for portable PC’s, cellular phones, and other portable systems where battery/DC power-line monitoring is critical. ■ Output voltage scaling ■ Up to 2.5V sense voltage ■ 2V to 6V supply range ■ 2μA typical offset current ■ 3.5μA quiescent current ■ -0.2% accuracy To provide a high level of flexibility, the FAN4010 functions with an external sense resistor to set the range of load current to be monitored. It has a current output that can be converted to a ground-referred voltage with a single resistor, accommodating a wide range of battery voltages and currents. The FAN4010 features allow it to be used for gas gauging as well as uni-directional or bi-directional current monitoring. ■ SOT23-5 package ■ 6-lead MicroPak™ future package option Applications ■ Battery chargers ■ Smart battery packs ■ DC motor control ■ Over-current monitor ■ Power management ■ Programmable current source Functional Block Diagram and Typical Circuit Load VIN RLoad 1007 1 NC 2 GND 3 IOUT Load 5 RSENSE VIN 4 VIN VOUT ROUT IOUT Figure 1. Functional Block Diagram and Typical Circuit Ordering Information Part Number FAN4010IS5X FAN4010IL6X* Package Pb-Free Operating Temperature Range Packaging Method SOT23-5 MicroPak-6 Yes Yes -40°C to +85°C -40°C to +85°C Reel Reel Moisture sensitivity level for all parts is MSL-1. MicroPak™ is a trademark of Fairchild Semiconductor Corporation. *Future package option. © 2007 Fairchild Semiconductor Corporation FAN4010 Rev. 1.0.1 www.fairchildsemi.com FAN4010 High-Side Current Sensor March 2007 MicroPak SOT23-5 NC 1 GND 2 IOUT 3 5 4 Load VIN GND 1 6 Load NC 2 5 VIN NC 3 4 IOUT top view Figure 2. SOT23-5 Pin Configuration Figure 3. MicroPak™-5 Pin Configuration Pin Assignments SOT Pin # MicroPak™ Pin # Name 1 2, 3 NC 2 1 GND Ground 3 4 IOUT Output current, proportional to VIN - VLoad 4 5 VIN Input voltage (supply voltage) 5 6 Load Connection to load or battery © 2007 Fairchild Semiconductor Corporation FAN4010 Rev. 1.0.1 Description No Connect; leave pin floating www.fairchildsemi.com 2 FAN4010 High-Side Current Sensor Pin Configurations Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Min. Max. Unit Vs Supply Voltage Parameter 0 6.3 V VIN Input Voltage Range 0 6.3 V Reliability Information Symbol TJ TSTG TL θJA Parameter Min. Typ. Max. Unit 150 °C 150 °C 260 °C Junction Temperature Storage Temperature Range -65 Reflow Temperature (Soldering) Package Thermal Resistance MicroPak™-5 271 °C/W SOC23-5 191 °C/W Note: 1. Package thermal resistance (θJA), JEDEC standard, multi-layer test boards, still air. ESD Protection Symbol Electrostatic Discharge Standard Value HBM Human Body Model 5kV CDM Charged Device Model 1kV Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Symbol Parameter Min. Typ. Max. Unit TA Operating Temperature Range -40 +85 °C Vs Supply Voltage Range 2 6 V VIN Input Voltage Range 2 6 V Sensor Voltage Range, VSENSE = VIN - VLoad; ROUT = 0Ω 0 2.5 V VSENSE © 2007 Fairchild Semiconductor Corporation FAN4010 Rev. 1.0.1 www.fairchildsemi.com 3 FAN4010 High-Side Current Sensor Absolute Maximum Ratings TA = 25°C, Vs = VIN = 5V, ROUT = 100Ω, RSENSE = 100Ω, unless otherwise noted. Symbol Parameter Conditions Min. Typ. Max. Units Frequency Domain Response BWss Small Signal Bandwidth PIN = -40dBm(2), VSENSE = 10mV 600 kHz BWLs Large Signal Bandwidth PIN = -20dBm(3), VSENSE = 100mV 2 MHz Input Voltage Range VIN = Vs 2 VSENSE = 0V 0 VIN IOUT Is ISENSE Output Current (1,4) Supply Current (1) 1 6 V 4 μA VSENSE = 10mV 93 100 107 μA VSENSE = 100mV 0.975 1.000 1.025 mA VSENSE = 200mV 1.95 2.00 2.05 mA VSENSE = 1V 9.7 10.0 10.3 mA 3.5 5.0 μA VSENSE = 0V, GND pin current 2 Load Pin Input Current ACY Accuracy RSENSE = 100Ω, RSENSE = 200mV(1) Gm Transconductance IOUT /VSENSE -2.5 -0.2 10000 nA 2.5 % μA/V Notes: 1. 100% tested at 25˚C. 2. -40dBm = 6.3mVpp into 50Ω. 3. -20dBm = 63mVpp into 50Ω. 4. Includes input offset voltage contribution. © 2007 Fairchild Semiconductor Corporation FAN4010 Rev. 1.0.1 www.fairchildsemi.com 4 FAN4010 High-Side Current Sensor Electrical Characteristics at +5V TA = 25°C, Vs = VIN = 5V, ROUT = 100Ω, RSENSE = 100Ω, unless otherwise noted. 10 250 Output Current Error (%) VS = 5V IOUT (mA) ROUT = 0Ω ROUT = 100Ω 1 VIN = 5V ROUT = 0Ω Average of 100 parts 200 150 100 +1 SIGMA 50 Average 0 -50 -1 SIGMA -100 -150 0.1 0.1 0.01 1 0.1m 1m 10m VSENSE (V) Figure 4. VSENSE vs. Output Current 10.4 Normalized Gain (dB) IOUT (mA) 3 10.0 9.8 9.6 9.4 Vs = 5V ROUT = 100Ω -20 0 20 40 60 VSENSE = 1V VSENSE = 0.1V -3 VSENSE = 0.01V -6 -9 PIN = -20dBm of VSENSE = 0.1V & 1V PIN = -40dBm of VSENSE = 0.01V 80 0.01 0.1 Temperature (°C) 1 10 Frequency (MHz) Figure 6. Output Current vs. Temperature Figure7. Frequency Response 12 12 ROUT = 0Ω ROUT = 100Ω VSENSE = 1V 10 IOUT (mA) VSENSE = 0.4V 4 VSENSE = 0.2V 2 VSENSE = 0.8V 8 VSENSE = 0.6V 6 VSENSE = 1V 10 VSENSE = 0.8V 8 IOUT (mA) 10 0 -12 -40 1 Figure 5. Output Current Error vs. VSENSE VSENSE = 1V VIN = 5V RL= 0Ω 10.2 100m VSENSE (V) VSENSE = 0.6V 6 VSENSE = 0.4V 4 VSENSE = 0.2V 2 0 0 -2 -2 0 1 2 3 4 0 5 VIN (V) 2 3 4 5 VIN (V) Figure 8. Transfer Characteristics © 2007 Fairchild Semiconductor Corporation FAN4010 Rev. 1.0.1 1 Figure 9. Transfer Characteristics www.fairchildsemi.com 5 FAN4010 High-Side Current Sensor Typical Performance Characteristics TA = 25°C, Vs = VIN = 5V, ROUT = 100Ω, RSENSE = 100Ω, unless otherwise noted. 0 2.5 CMRR (dB) -20 Output Current Error (%) VIN = 5V PIN = -20dBm ROUT = 100Ω -10 -30 -40 VSENSE = 100mV -50 -60 VSENSE = 10mV -70 VSENSE = 1mV -80 -90 0.00001 0.0001 VSENSE = 200mV ROUT = 0Ω Average of 100 parts 2.0 1.5 +1 SIGMA 1.0 Average 0.5 0 -0.5 -1 SIGMA -1.0 -1.5 -2.0 -2.5 0.001 0.01 0.1 1 10 2.0 Frequency (MHz) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 VIN (V) Figure 10. CMRR vs. Frequency Figure 11. VIN vs. Output Current Error 6.0 VIN = 5V ROUT = 100Ω 5.5 5.0 Is (μA) 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 VSENSE (V) Figure 12. Supply Current vs. VSENSE © 2007 Fairchild Semiconductor Corporation FAN4010 Rev. 1.0.1 www.fairchildsemi.com 6 FAN4010 High-Side Current Sensor Typical Performance Characteristics (Continued) Detailed Description The FAN4010 measures the voltage drop (V SENSE) across an external sense resistor located in the high voltage side of the circuit. V SENSE is converted to a linear current via an internal operational amplifier and precision 100Ω resistor. The value of this current is V SENSE/100Ω (internal). Output current flows from the IOUT pin to an external resistor R OUT to generate an output voltage proportional to the current flowing to the load. INPUT 0.3in Copper Use the following equations to scale a load current to an output voltage: VSENSE = ILoad * R SENSE EQ.1 V OUT = 0.01 x VSENSE x ROUT EQ.2 NC 2 GND 3 IOUT Load 4 ROUT Figure 13. Functional Circuit Selecting RSENSE Selection of RSENSE is a balance between desired accuracy and allowable voltage loss. Although the FAN4010 is optimized for high accuracy with low VSENSE values, a larger RSENSE value provides additional accuracy. However, larger values of RSENSE create a larger voltage drop, reducing the effective voltage available to the load. This can be troublesome in low-voltage applications. Because of this, the maximum expected load current and allowable load voltage should be well understood. Although higher values of VSENSE can be used, RSENSE should be chosen to satisfy the following condition: 3 IOUT VIN 4 The input voltage and full-scale output current (IOUT_ needs to be taken into account when setting up the output range. To ensure sufficient operating headroom, choose: FS) (R OUT * IOUT_FS) such that VIN - VSENSE - (ROUT * IOUT_FS) > 1.2V EQ. 4 Output current accuracy for the recommended V SENSE levels between 10mV and 200mV are typically much better than 1%. As a result, the absolute output voltage accuracy is dependent upon the precision of the output resistor. EQ. 3 For low-cost applications where accuracy is not as important, a portion of the printed circuit board (PCB) trace can be used as an R SENSE resistor. Figure 14 shows an example of this configuration. The resistivity of a 0.1 inch wide trace of two-ounce copper is about 30mΩ/ft. Unfortunately, the resistance temperature coefficient is relatively large (approximately 0.4% / C), so systems with a wide temperature range may need © 2007 Fairchild Semiconductor Corporation FAN4010 Rev. 1.0.1 GND 5 R OUT can be chosen to obtain the output voltage range required for the particular downstream application. For example, if the output of the FAN4010 is intended to drive an analog-to-digital convertor (ADC), R OUT should be chosen such that the expected full-scale output current produces an input voltage that matches the input range of the ADC. For instance, if expected loading current ranges from 0 to 1A, a R SENSE resistor of 1Ω produces an output current that ranges from 0 to 10mA. If the input voltage range of the ADC is 0 to 2V, a R OUT value of 200Ω should be used. VIN VOUT 10mV < VSENSE < 200mV 2 Load Selecting ROUT VSENSE + VIN NC Figure 14. Using PCB Trace for RSENSE – 1007 1 0.3in Copper ROUT 5 RSENSE 0.1in Copper VOUT RLoad 1 LOAD RSENSE Make sure the input impedance of the circuit connected to VOUT is much higher than ROUT to ensure accurate V OUT values. Since the FAN4010 provides a trans-impedance function, it is ideal for applications involving current rather than voltage sensing. www.fairchildsemi.com 7 FAN4010 High-Side Current Sensor to compensate for this effect. Additionally, self heating due to load currents introduces a nonlinearity error. Care must be taken not to exceed the maximum power dissipation of the copper trace. Application Information FAN4010 High-Side Current Sensor Mechanical Dimensions Dimensions are in millimeters unless otherwise noted. Figure 15. 5-Lead SOT23 Package © 2007 Fairchild Semiconductor Corporation FAN4010 Rev. 1.0.1 www.fairchildsemi.com 8 Dimensions are in millimeters unless otherwise noted. 2X 0.05 C 1.45 B 2X (1) 0.05 C (0.49) 5X 1.00 (0.75) (0.52) 1X A TOP VIEW 0.55MAX (0.30) 6X PIN 1 0.05 C 0.05 0.00 RECOMMENED LAND PATTERN 0.05 C C DETAIL A 0.25 0.15 6X 1.0 0.10 0.05 0.45 0.35 0.10 0.00 6X C B A C 0.40 0.30 0.35 5X 0.25 0.40 5X 0.30 (0.05) 6X Notes: 0.5 BOTTOM VIEW (0.13) 4X 0.075 X 45 CHAMFER DETAIL A PIN 1 TERMINAL 1. CONFORMS TO JEDEC STANDARD M0-252 VARIATION UAAD 2. DIMENSIONS ARE IN MILLIMETERS 3. DRAWING CONFORMS TO ASME Y14.5M-1994 MAC06AREVC Figure 16. 6-Lead MicroPak™ Package © 2007 Fairchild Semiconductor Corporation FAN4010 Rev. 1.0.1 www.fairchildsemi.com 9 FAN4010 High-Side Current Sensor Mechanical Dimensions FAN4010 High-Side Current Sensor www.fairchildsemi.com ©2007 Fairchild Semiconductor Corporation