19-4342; Rev 0; 10/08 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier The MAX9610 high-side current-sense amplifier offers precision accuracy specifications of V OS less than 500μV (max) and gain error less than 0.5% (max). This device features an ultra-low 1μA quiescent supply current. The MAX9610 fits in a tiny, 1mm x 1.5mm μDFN package or a 5-pin SC70 package, making this part ideal for applications in notebook computers, cell phones, cameras, PDAs, and all lithium-ion batteryoperated portable devices where accuracy, low quiescent current, and small size are critical. The MAX9610 features an input voltage range (common mode) from 1.6V to 5.5V. This input range is excellent for monitoring the current of a single-cell, lithium-ion battery (Li+), which at full charge is 4.2V, typically 3.6V in normal use, and less than 2.9V when ready to be recharged. These current-sense amplifiers have a voltage output and are offered in three gain versions: 25V/V (MAX9610T), 50V/V (MAX9610F), and 100V/V (MAX9610H). The three gain versions offer flexibility in the choice of the external current-sense resistor. The very low 500μV (max) input offset voltage allows small 25mV to 50mV full-scale VSENSE voltage for very low voltage drop at full-load current measurement. The MAX9610 is offered in tiny 6-pin μDFN, (1mm x 1.5mm x 0.8mm footprint) and 5-pin SC70 packages, specified for operation over the -40°C to +85°C temperature range. For a very similar 1.6V to 28V input voltage device in a 4-bump UCSP™ package (1mm x 1mm x 0.6mm), refer to the MAX9938 data sheet. Features ♦ Ultra-Low Supply Current of 1µA (max) ♦ Low 500µV (max) Input Offset Voltage ♦ Low < 0.5% (max) Gain Error ♦ Input Common Mode: +1.6V to +5.5V ♦ Voltage Output ♦ Three Gain Versions Available 25V/V (MAX9610T) 50V/V (MAX9610F) 100V/V (MAX9610H) ♦ Tiny µDFN (1mm x 1.5mm x 0.8mm) and SC70 Packages Ordering Information PINPACKAGE PART* GAIN (V/V) TOP MARK MAX9610TELT+T 6 μDFN 25 OU MAX9610FELT+T 6 μDFN 50 OS MAX9610HELT+T 6 μDFN 100 OT MAX9610TEXK+T 5 SC70 25 ATG MAX9610FEXK+T 5 SC70 50 ATE MAX9610HEXK+T 5 SC70 100 ATF *All devices are specified over the -40°C to +85°C extended temperature range. +Denotes a lead-free/RoHS-compliant package. T = Tape and reel. Typical Operating Circuit Applications ILOAD RSENSE Cell Phones RS+ Cameras RSLOAD Portable Li+ Battery Powered Systems 3.3V and 5V Power Management Systems PDAs R1 R1 VBATT = 1.6V to 5.5V USB Ports VDD = 3.3V P μC OUT Pin Configurations appear at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. ROUT 10kΩ ADC MAX9610 GND ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX9610 General Description MAX9610 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier ABSOLUTE MAXIMUM RATINGS RS+, RS- to GND......................................................-0.3V to +6V OUT to GND .............................................................-0.3V to +6V RS+ to RS- .............................................................................±6V Short-Circuit Duration: OUT to GND or RS+ ..............Continuous Continuous Input Current (Any Pin)..................................±20mA Continuous Power Dissipation (TA = +70°C) 5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............247mW 6-Pin μDFN (derate 2.1mW/°C above +70°C) .............168mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Package Reflow Soldering Temperature .........................+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. ELECTRICAL CHARACTERISTICS (VRS+ = VRS- = 3.6V, VSENSE = (VRS+ - VRS-) = 0, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN VRS+ = 3.6V, TA = +25°C Supply Current (Note 2) ICC TYP MAX 0.6 1.0 VRS+ = 3.6V, -40°C < TA < +85°C 1.4 VRS+ = 5.5V, TA = +25°C 0.75 VRS+ = 5.5V, -40°C < TA < +85°C Common-Mode Input Range Common-Mode Rejection Ratio VCM CMRR VOS Guaranteed by CMRR, -40°C < TA < +85°C 1.6 1.6V < VRS+ < 5.5V, -40°C < TA < +85°C 80 -40°C < TA < +85°C Gain Error G GE Output Resistance ROUT OUT Low Voltage VOL OUT High Voltage 2 VOH 5.5 104 ±100 dB ±600 Gain = 100 ±700 μV 25 MAX9610F 50 MAX9610H 100 TA = +25°C, gain = 25, 50, 100 (Note 4) ±0.1 -40°C < TA < +85°C V ±500 Gain = 25, 50 MAX9610T Gain μA 1.6 TA = +25°C, gain = 25, 50, 100 (Note 3) Input Offset Voltage 1.2 UNITS Gain = 25, 50 ±0.5 ±0.8 Gain = 100 TA = +25°C (Note 5) V/V % ±1 7.0 10 13.2 G = 25 2.5 15 G = 50 5 30 G = 100 10 70 VOH = VRS- - VOUT (Note 6) 0.1 0.2 _______________________________________________________________________________________ kΩ mV V 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier (VRS+ = VRS- = 3.6V, VSENSE = (VRS+ - VRS-) = 0, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Small-Signal Bandwidth CONDITIONS BW TYP 170 MAX UNITS kHz VSENSE = 50mV, G = 50 110 VSENSE = 50mV, G = 100 60 tS 1% final value, VSENSE = 25mV 35 μs tON 1% final value, VSENSE = 25mV 100 μs Output Settling Time Power-Up Time MIN VSENSE = 50mV, G = 25 All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design. VOUT = 0V. ICC is the total current into RS+ plus RS-. VOS is extrapolated from measurements for the Gain Error test. Gain Error is calculated by applying two values of VSENSE and calculating the error of the slope, vs. the ideal: G = 25: VSENSE 20mV and 120mV G = 50: VSENSE 10mV and 60mV G = 100: VSENSE 5mV and 30mV Note 5: The device is stable for any external capacitance value. Note 6: VOH is the voltage from VRS- to VOUT with VSENSE = 3.6V/Gain. Note 1: Note 2: Note 3: Note 4: Typical Operating Characteristics (VRS+ = VRS- = 3.6V, TA = +25°C.) 25 N (%) 20 N (%) 900 800 SUPPLY CURRENT (nA) 15 10 1000 MAX9610 toc02 30 MAX9610 toc01 20 SUPPLY CURRENT vs. TEMPERATURE MAX9610F GAIN ACCURACY HISTOGRAM 15 10 5 MAX9610 toc03 MAX9610F OFFSET VOLTAGE HISTOGRAM 5.5V 3.6V 700 600 500 1.6V 400 300 200 5 100 0 0 0 -250 -200-150-100 -50 0 50 100 150 200 250 OFFSET VOLTAGE (μV) -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2 GAIN ACCURACY (%) -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 3 MAX9610 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VRS+ = VRS- = 3.6V, TA = +25°C.) SUPPLY CURRENT vs. COMMON-MODE VOLTAGE 0.60 0.50 0.40 0.30 70 60 50 40 30 0.20 20 0.10 10 0 2.1 2.6 3.1 3.6 4.1 4.6 5.5 40 30 20 10 0 0 -40 -15 10 35 60 85 1.6 2.1 2.6 3.1 3.6 4.1 4.6 COMMON-MODE VOLTAGE (V) TEMPERATURE (°C) COMMON-MODE VOLTAGE (V) GAIN ERROR vs. TEMPERATURE GAIN ERROR vs. COMMON-MODE VOLTAGE VOUT vs. VSENSE VRS+ = 5.5V 0.21% -0.04% GAIN ERROR (%) 0.19% 0.17% 0.15% 0.13% 6.0 5.5 5.0 4.5 -0.06% -0.08% VOUT (V) 0.23% -0.02% -0.10% -0.12% 0.11% -0.14% 0.09% -0.16% 0.07% -0.18% 10 35 60 1.6 85 VOUT vs. VSENSE VRS+ = 1.6V G = 100 2.1 2.6 3.1 3.6 4.1 4.6 5.1 5.5 0 0 NORMALIZED GAIN (dB) 1.4 G = 25 1.0 G = 50 G = 100 150 200 250 CMRR vs. FREQUENCY -40 G = 100 -60 -5 G = 50 -10 100 -20 MAX9610 toc11 5 MAX9610 toc10 1.6 1.2 50 VSENSE (mV) NORMALIZED GAIN vs. FREQUENCY 1.8 0.6 G = 50 COMMON-MODE VOLTAGE (V) TEMPERATURE (°C) 0.8 G = 25 MAX9610 toc12 -15 CMRR (dB) -40 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -0.20% 0.05% 5.1 5.5 MAX9610 toc09 0% MAX9610 toc07 0.25% MAX9610 toc08 1.6 MAX9610 toc06 50 OFFSET VOLTAGE (μV) 80 0.70 60 MAX9610 toc05 90 OFFSET VOLTAGE (μV) 0.80 SUPPLY CURRENT (μA) 100 MAX9610 toc04 0.90 GAIN ERROR (%) OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE OFFSET VOLTAGE vs. TEMPERATURE 1.00 VOUT (V) MAX9610 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier G = 25 -80 -15 -100 -20 -120 0.4 0.2 0 10 20 30 40 50 VSENSE (mV) 4 -140 -25 0 60 70 80 0.1 1 10 FREQUENCY (kHz) 100 1000 10 100 1k FREQUENCY (Hz) _______________________________________________________________________________________ 10k 100k 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier SMALL-SIGNAL RESPONSE G = 50 SMALL-SIGNAL RESPONSE G = 25 MAX9610 toc14 MAX9610 toc13 20mV/div VSENSE VOUT 200mV/div 10mV/div VSENSE VOUT 200mV/div 10μs/div 10μs/div SMALL-SIGNAL RESPONSE G = 100 LARGE-SIGNAL RESPONSE G = 25 MAX9610 toc16 MAX9610 toc15 5mV/div VSENSE VOUT 200mV/div 100mV/div VSENSE VOUT 1V/div 10μs/div 10μs/div LARGE-SIGNAL RESPONSE G = 50 LARGE-SIGNAL RESPONSE G = 100 MAX9610 toc17 MAX9610 toc18 50mV/div VSENSE VOUT 1V/div 10μs/div 20mV/div VSENSE VOUT 1V/div 10μs/div _______________________________________________________________________________________ 5 MAX9610 Typical Operating Characteristics (continued) (VRS+ = VRS- = 3.6V, TA = +25°C.) 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier MAX9610 Pin Description PIN NAME FUNCTION µDFN SC70 1 1, 2 GND Ground 2, 5 — N.C. No Connection. Not internally connected. 3 3 OUT Output 4 4 RS- Load-Side Connection to External Sense Resistor 6 5 RS+ Power-Side Connection to External Sense Resistor Detailed Description The MAX9610 family of unidirectional high-side, current-sense amplifiers features a 1.6V to 5.5V input common-mode range. The input range is excellent for monitoring the current of a single-cell lithium-ion battery (Li+), which at full charge is 4.2V, typically 3.6V in normal use, and less than 2.9V when ready to be recharged. The MAX9610 is ideal for many batterypowered, handheld devices because it uses only 1μA quiescent supply current to extend battery life. The MAX9610 monitors current through a current-sense resistor and amplifies the voltage across that resistor. See the Typical Operating Circuit on page 1. The MAX9610 is a unidirectional current-sense amplifier that has a well-established history. An op amp is used to force the current through an internal gain resistor at RS+ that has a value of R1, such that its voltage drop equals the voltage drop across an external sense resistor, RSENSE. There is an internal resistor at RS- with the same value as R1 to minimize offset voltage. The current through R1 is sourced by a pFET. Its drain current is the same as its source current that flows through a second gain resistor, ROUT. This produces an output voltage, VOUT, whose magnitude is ILOAD x RSENSE x ROUT/R1. The gain accuracy is based on the matching of the two gain resistors R1 and ROUT (see Table 1). Total gain = 25V/V for the MAX9610T, 50V/V for the MAX9610F, and 100V/V for the MAX9610H. Applications Information OUT Swing vs. VRS+ and VSENSE The MAX9610 is unique since the supply voltage is the input common-mode voltage (the average voltage at RS+ and RS-). There is no separate VCC supply voltage input. Therefore, the OUT voltage swing is limited by the minimum voltage at RS+. VOUT(MAX) = VRS+(MAX) - VSENSE(MAX) - VOH and RSENSE = VOUT G × I LOAD (max) VSENSE full scale should be less than VOUT/gain at the minimum RS+ voltage. For best performance with a 3.6V supply voltage, select RSENSE to provide approximately 120mV (gain of 25V/V), 60mV (gain of 50V/V), or 30mV (gain of 100V/V) of sense voltage for the fullscale current in each application. These can be increased by use of a higher minimum input voltage. Accuracy In the linear region (VOUT < VOUT(MAX)), there are two components to accuracy: input offset voltage (VOS) and Gain Error (GE). The MAX9610 has VOS = 500μV (max) and Gain Error of 0.5% (max). Use the following linear equation to calculate total error. VOUT = (Gain ± GE) x VSENSE ± (Gain x VOS) A high RSENSE value allows lower currents to be measured more accurately because offsets are less significant when the sense voltage is larger. Efficiency and Power Dissipation At high current levels, the I2R loss 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. The precision VOS of the MAX9610 allows the use of small sense resistors to reduce power dissipation and reduce hot spots. Table 1. MAX9610, Internal Gain Setting Resistors (Typical Values) GAIN (V/V) R1 (Ω) ROUT (Ω) Choose RSENSE based on the following criteria. 100 100 10k Voltage Loss A high RSENSE value causes the power-source voltage to drop due to IR loss. For minimal voltage loss, use the lowest RSENSE value. 50 200 10k 25 400 10k Choosing the Sense Resistor 6 _______________________________________________________________________________________ 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier Optional Output Filter Capacitor When designing a system that uses a sample and hold stage in the analog-to-digital converter, the sampling capacitor momentarily loads OUT and causes a drop in the output voltage. If sampling time is very short (less than a microsecond), consider using a ceramic capacitor across OUT and GND to hold VOUT constant during sampling. This also decreases the small-signal bandwidth of the current-sense amplifier and reduces noise at OUT. ILOAD Typical Application Circuit Bidirectional Application Battery-powered systems may require a precise bidirectional current-sense amplifier to accurately monitor the battery’s charge and discharge currents. Measurements of the two separate outputs with respect to GND yield an accurate measure of the charge and discharge currents, respectively (Figure 1). RSENSE TO WALL-CUBE/ CHARGER RS+ RS- RS+ RSLOAD R1 R1 R1 R1 VDD = 3.3V VBATT = 1.6V TO 5.5V P P MICROCONTROLLER OUT ROUT MAX9610 GND OUT ROUT MAX9610 ADC GND ADC Figure 1. Bidirectional Application _______________________________________________________________________________________ 7 MAX9610 Kelvin Connections 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) PCB layout techniques. 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier MAX9610 Pin Configurations Chip Information PROCESS: BiCMOS TOP VIEW (PINS ON BOTTOM) RS+ N.C. RS- 6 5 4 MAX9610T/F/H + 1 2 3 GND N.C. OUT 1mm x 1.5mm μDFN TOP VIEW RS+ 5 RS4 MAX9610T/F/H + 1 2 GND GND 3 OUT 2mm x 2.2mm SC70 (DIAGRAMS NOT TO SCALE.) 8 _______________________________________________________________________________________ 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier PACKAGE CODE DOCUMENT NO. 6 μDFN L611+1 21-0147 5 SC70 X5+1 21-0076 TOPMARK 3 2 5 e A 4 b 5 4 AA PIN 1 MARK 6L UDFN.EPS PACKAGE TYPE 6 PIN 1 0.075x45 L E 1 A2 D A1 TOP VIEW 3 2 A L1 SIDE VIEW A 1 L2 BOTTOM VIEW COMMON DIMENSIONS b SECTION A-A MIN. 0.65 -0.00 1.45 0.95 0.30 0.00 0.05 0.17 A A1 A2 D E L L1 L2 b e Pkg. Code NOM. 0.72 0.20 -1.50 1.00 0.35 --0.20 0.50 BSC. MAX. 0.80 -0.05 1.55 1.05 0.40 0.08 0.10 0.23 L611-1, L611-2 TITLE: PACKAGE OUTLINE, 6L uDFN, 1.5x1.0x0.8mm APPROVAL -DRAWING NOT TO SCALE- DOCUMENT CONTROL NO. 21-0147 REV. E 1 2 _______________________________________________________________________________________ 9 MAX9610 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. MAX9610 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Translation Table for Calendar Year Code TABLE 1 Calendar Year 2005 2006 Marked with bar Legend: 2007 2008 2009 2010 2011 2012 2013 42-47 48-51 52-05 2014 Blank space - no bar required Translation Table for Payweek Binary Coding TABLE 2 Payweek Legend: 06-11 12-17 Marked with bar 18-23 24-29 30-35 36-41 Blank space - no bar required TITLE: PACKAGE OUTLINE, 6L uDFN, 1.5x1.0x0.8mm APPROVAL -DRAWING NOT TO SCALE- 10 DOCUMENT CONTROL NO. 21-0147 ______________________________________________________________________________________ REV. E 2 2 1µA, µDFN/SC70, Lithium-Ion Battery, Precision Current-Sense Amplifier SC70, 5L.EPS PACKAGE OUTLINE, 5L SC70 21-0076 E 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX9610 Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.