TM MP8100 Precision High-Side Current-Sense Amplifier The Future of Analog IC Technology TM INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE DESCRIPTION FEATURES The MP8100 is a low-cost, precision, high-side current-sense amplifier. This device operates from a single 2.5V to 18V supply and typically consumes 17µA. It is ideal for today’s notebook computers, cell phones and other systems where battery/DC current monitoring is critical. • • • • • • • • • High-side current monitoring is especially useful in battery-powered systems since it does not interfere with the ground path of the battery charger. The input common-mode range of 1.5V to 18V is independent of the supply voltage and ensures that the current-sense feedback remains viable even when connected to a 2-cell battery pack in deep discharge. Low-Cost, Compact Current-Sense Solution 17µA Typical Supply Current 2.5V to 18V Operating Supply Voltage 1.5V to 18V Input Common Mode Range 1µA Typical Shutdown Current 250µV Input Offset Voltage High Current Sensing Capability Low 100mΩ Output Impedance (Optional) Available in an 8-Pin SOIC Package APPLICATIONS • • • • • • • Portable PCs PDA’s Smart Battery Packs Cell Phones Portable Test/Measurement Systems Battery-Operated Systems Energy Management Systems “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION VIN LOAD + -- 3 7 1 SHUTDOWN VOLTAGE + -- 4 RG2 RG1 VCC MP8100 SHDN OUT2 GND OUT1 6 8 5 COUT1 Opt. COUT2 100pF ROUT2 Opt. MP8100_TAC_S01 MP8100 Rev. 0.91 4/14/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 1 TM MP8100 – PRECISION HIGH-SIDE CURRENT-SENSE AMPLIFIER INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE ABSOLUTE MAXIMUM RATINGS (1) PACKAGE REFERENCE VCC, RG1, RG2 to GND ............. –0.3V to +20V Maximum Differential Input Voltage, RG1 to RG2 ............................................................... 5V Storage Temperature .............–65°C to +150°C TOP VIEW SHDN 1 8 OUT2 NC 2 7 VCC RG1 3 6 RG2 GND 4 5 OUT1 Recommended Operating Conditions VCC, RG1, RG2 to GND ................... 2.5V to 18V Operating Temperature .............–40°C to +85°C Thermal Resistance (3) θJA θJC SOIC8..................................... 90 ...... 42... °C/W Continuous Power Dissipation (TA=70°C) ...............................................800mW MP8100_PD01_SOIC8 Part Number* Package Temperature MP8100DS SOIC8 –40°C to +85°C * (2) For Tape & Reel, add suffix –Z (eg. MP8100DS–Z) For Lead Free, add suffix –LF (eg. MP8100DS–LF–Z) Notes: 1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its operating conditions. 3) Measured on approximately 1” square of 1 oz copper. ELECTRICAL CHARACTERISTICS VCC = 10V, VSHDN = 0V, TA = +25°C, unless otherwise noted. Parameter Symbol Supply Voltage VCC Supply Current ICC Conditions Min Typ Max Units 18 V 17 30 µA 2.5 ILOAD = 0A; VCC = 18V OUT1 Input Offset Voltage VOS1 0.25 1.20 mV OUT2 Input Offset Voltage VOS2 0.25 1.20 mV Input Bias Current IRG1, IRG2 4 nA OUT1 Current Accuracy No-Load OUT1 Error Low-Level OUT1 Error No-Load OUT2 Error Low-Level OUT2 Error Power Supply Rejection Ratio IRG1/IOUT1 ±1 1 2 1 2 % µA µA µA µA 0.05 %/V Shutdown Supply Current ICC(SHDN) SHDN Threshold Voltage VTH_SHUTDOWN SHDN Input Low Current IIL SHDN Input High Current IIH OUT1 Output Voltage Range OUT2 Output Voltage Range MP8100 Rev. 0.91 4/14/2006 PSRR VSENSE = 100mV VSENSE = 0V VSENSE = 5mV VSENSE = 0V VSENSE = 5mV 2.5V < VCC < 18V, VSENSE = 100mV VSHDN = Float; VCC = 18V 0.7 1 5 µA 1.0 1.8 V –300 nA +500 nA VOUT1 VCC – 0.15 V VOUT2 VCC – 1 V VSHDN = 3V www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 2 TM MP8100 – PRECISION HIGH-SIDE CURRENT-SENSE AMPLIFIER INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE ELECTRICAL CHARACTERISTICS (continued) VCC = 10V, VSHDN = 0V, TA = +25°C, unless otherwise noted. Parameter Symbol (4) tR, tF OUT2 Rise, Fall Time (4) tR, tF OUT1 Rise, Fall Time Conditions VSENSE = 10mV to 150mV, ROUT1 = 10kΩ, RG1 = RG2 = 2kΩ, COUT1 = 50pF, 10% to 90% VSENSE = 10mV to 150mV, R OUT2 = 100kΩ, RG1 = RG2 = 2kΩ, COUT2 = 100pF, 10% to 90% Min Typ Max Units TBD µs TBD µs Maximum OUT1 Current (4) IOUT1 500 µA (4) IOUT2 5 mA Maximum OUT2 Current Notes: 4) Guaranteed by design. 5) Input common mode range cannot exceed the supply voltage. PIN FUNCTIONS Pin # Name 1 SHDN 2 3 4 5 6 7 8 NC RG1 GND OUT1 RG2 VCC OUT2 MP8100 Rev. 0.91 4/14/2006 Description Shutdown. Connect to ground for normal operation. When high, supply current is less than 5µA. Not Connected. Gain Resistor. Connect to battery side of current-sense resistor through the gain resistor. Ground or Battery Negative Terminal. Output For Driving Resistive Loads. Gain Resistor. Connect to load side of current-sense resistor through the gain resistor. Power Input. Connect to Battery Input. Output For Driving Capacitive Loads. www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 3 TM MP8100 – PRECISION HIGH-SIDE CURRENT-SENSE AMPLIFIER INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE OPERATION The MP8100 is a current-sense amplifier with a wide operating input voltage range of 2.5V to 18V. SHDN 1 -- BIAS + ENABLE 8 OUT2 BUFFER + 7 VCC NC 2 6 RG2 RG1 3 -+ GND 4 ERROR AMPLIFIER 5 OUT1 MP8100_F01_BD Figure 1—Functional Block Diagram APPLICATION INFORMATION COMPONENT SELECTION Table 1—Suggested Component Values Full-Scale Load Current, ISENSE (A) Current Sense Resistor (mΩ) Gain Setting Resistor (kΩ) (RG1 = RG2) ROUT1 (kΩ) Gain 0.1 1 5 10 500 50 10 5 2 2 2 2 20 20 20 20 10 10 10 10 The value of VOUT1 can be obtained with the equation: VOUT = IL × R S × R OUT1 = IL × R S × Gain R G1 Where RG1 is the sense resistor and IL is the load current. MP8100 Rev. 0.91 4/14/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 4 TM MP8100 – PRECISION HIGH-SIDE CURRENT-SENSE AMPLIFIER INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE PACKAGE INFORMATION SOIC8 NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP8100 Rev. 0.91 4/14/2006 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. 5