EVALUATION KIT AVAILABLE MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp General Description Benefits and Features The MAX44281 is the industry’s first op amp in a 4-bump WLP package, designed for use in portable consumer and medical applications. This device is offered as a noninverting amplifier with gain (AV) of +1V/V, +2V/V, or +10V/V. S 0.86mm x 0.86mm 4-Bump Thin WLP Package The device features rail-to-rail output, low 100µV input voltage offset, and 15MHz of bandwidth with only 700µA of supply current. S Shutdown Input Through VDD S Low 100µV Input Offset Voltage S Rail-to-Rail Output S 15MHz GBW with Only 700µA Supply Current S Ultra-Low 10pA Input Bias Current S 1.8V to 5.5V Wide Supply Range The device features shutdown functionality by pulling VDD to ground. During shutdown, both the input and the output are high impedance. S Three Gain Versions Available 1V/V (MAX44281O) 2V/V (MAX44281V) 10V/V (MAX44281U) The device is available in an ultra-small, 0.86mm x 0.86mm, 4-bump WLP package with 0.5mm height. It is specified over the -40°C to +125°C temperature range. Applications 3G/4G Handsets Sensor Interfaces General-Purpose Signal Processing Portable Medical Devices Notebooks Battery-Powered Devices Transimpedance Amplifiers Ordering Information appears at end of data sheet. For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX44281.related. Functional Diagrams VDD IN VDD MAX44281O VDD MAX44281V IN MAX44281U IN OUT OUT OUT R GND 9R R R GND For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. GND 19-6541; Rev 0; 12/12 MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp ABSOLUTE MAXIMUM RATINGS VDD to GND.............................................................-0.3V to +6V IN to GND.................................................................-0.3V to +6V OUT to GND............................... (VGND - 0.3V) to (VDD + 0.3V) Continuous Power Dissipation (TA = +70NC) WLP (derate 9.7mW/NC above +70NC).........................303mW Maximum Continuous Current into Any Pin....................P 20mA Operating Temperature Range......................... -40NC to +125NC Storage Temperature Range............................. -65NC to +150NC Soldering Temperature (reflow).......................................+260NC 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. PACKAGE THERMAL CHARACTERISTICS (Note 1) WLP Junction-to-Ambient Thermal Resistance (qJA).........103°C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (VDD = 3.3V, VGND = 0V, RL = 10kI to VDD/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC PERFORMANCE (Note 1) Input Voltage Range (Note 3) Gain Error Input Offset Voltage (Note 2) Input Offset Voltage Drift (Note 2) VIN GE VOS 0.1 VDD 0.1 AV = 2V/V (MAX44281V) 0.05 (VDD 0.1)/2 AV = 10V/V (MAX44281U) 0.01 (VDD 0.1)/10 AV = 1V/V (MAX44281O) 0.01 0.02 AV = 2V/V (MAX44281V) 0.2 0.6 AV = 10V/V (MAX44281U) 0.3 0.7 AV = 1 20 100 AV = 2V/V 20 100 AV = 10V/V 20 100 VIN = 150mV, no load VOS - TC Input Bias Current (Note 2) IB Output Short-Circuit Current ISC Output Voltage Low VOL Maxim Integrated AV = 1V/V (MAX44281O) TA = +25NC (Note 2) 2 9 1 10 TA = -40NC to +125NC OUT to VDD or GND 2000 50 V % FV FV/NC pA mA ROUT = 10kI 0.02 ROUT = 600I 0.1 V 2 MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp ELECTRICAL CHARACTERISTICS (continued) (VDD = 3.3V, VGND = 0V, RL = 10kI to VDD/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1) PARAMETER Output Voltage High Input Voltage-Noise Density Gain Bandwidth Slew Rate Capacitive Load SYMBOL CONDITIONS ROUT = 10kI VDD – 0.1 ROUT = 600I VDD – 0.1 VOH en MIN TYP MAX UNITS V AV = 1V/V, f = 10kHz 15 AV = 2V/V, f = 10kHz 19 AV = 10V/V, f = 10kHz 16 nV/√Hz GBW 15 MHz SR 8 V/Fs 100 pF CLOAD No sustained oscillations POWER-SUPPLY CHARACTERISTICS Power-Supply Range Power-Supply Rejection Ratio Supply Current Shutdown Supply Current Shutdown Threshold Turn-On Time VDD Guaranteed by PSRR TA = -40NC to +125NC 1.8 5.5 TA = 0NC to +70NC 1.7 5.5 PSRR ICC 75 VOUT = VDD/2, no load 100 700 ISHDN VIL tON V dB 1200 FA 1 FA 0.5 V TA = +25NC 10 20 TA = -40NC to +125NC 10 30 ms Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design. Note 2: Guaranteed by design. Note 3: Guaranteed by gain accuracy specifications. Maxim Integrated 3 MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) -20 -40 -60 PHASE -80 -100 -120 -140 50 MAX44281V GAIN 0 -50 PHASE -100 50 MAX44281U GAIN -150 -160 MAX44281 toc01c GAIN GAIN (dB)/PHASE (degrees) MAX44281O GAIN (dB)/PHASE (degrees) GAIN (dB)/PHASE (degrees) 0 MAX44281 toc01a 20 GAIN AND PHASE vs. FREQUENCY (NO LOAD) MAX44281 toc01b GAIN AND PHASE vs. FREQUENCY (NO LOAD) GAIN AND PHASE vs. FREQUENCY (NO LOAD) 0 -50 PHASE -100 -150 -180 100 10,000 10,000 100 0.01 1 10,000 100 FREQUENCY (kHz) GAIN AND PHASE vs. FREQUENCY (CL = 100pF) GAIN AND PHASE vs. FREQUENCY (CL = 100pF) GAIN AND PHASE vs. FREQUENCY (CL = 100pF) -50 PHASE -100 MAX44281V GAIN -150 0 -50 PHASE -100 -150 -200 1 100 10,000 1 100 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY OUTPUT IMPEDANCE vs. FREQUENCY OUTPUT IMPEDANCE (I) -60 -80 0.01 1 100 FREQUENCY (kHz) Maxim Integrated 10,000 -100 0.01 1 10,000 100 INPUT-REFERRED VOLTAGE-NOISE DENSITY vs. FREQUENCY MAX44281 toc04 100 10 1 -100 -120 PHASE FREQUENCY (kHz) 1000 MAX44281 toc03 -40 -50 10,000 FREQUENCY (kHz) -20 GAIN 0 -200 0.01 FREQUENCY (kHz) 0 MAX44281U -150 -200 0.01 50 GAIN (dB)/PHASE (degrees) 0 50 1000 INPUT-REFERRED VOLTAGE-NOISE DENSITY (nV/√Hz) MAX44281O MAX44281 toc02b FREQUENCY (kHz) GAIN (dB)/PHASE (degrees) GAIN (dB)/PHASE (degrees) 1 FREQUENCY (kHz) GAIN PSRR (dB) -200 0.01 MAX44281 toc02a 50 1 MAX44281 toc02c -200 0.01 MAX44281O VOUT = VDD/2 MAX44281 toc05 -200 100 10 1 0.1 0.01 1 100 FREQUENCY (kHz) 10,000 0.01 0.1 1 10 100 FREQUENCY (kHz) 4 MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) 10 1 100 10 FREQUENCY (kHz) SUPPLY CURRENT vs. SUPPLY VOLTAGE 1 400 300 NO LOAD MAX44281O 0.040 GAIN ACCURACY vs. TEMPERATURE 0.035 0.030 0.025 0.020 0.015 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.005 0.01 0 0 5 1 2 3 -40 10 60 110 INPUT VOLTAGE (V) TEMPERATURE (°C) INPUT OFFSET VOLTAGE vs. TEMPERATURE INPUT BIAS CURRENT vs. TEMPERATURE INPUT BIAS CURRENT vs. INPUT VOLTAGE 40 20 0 -20 -40 -60 VIN = VDD/2 NOLOAD 2000 1500 1000 500 5.0 NO LOAD MAX44281O 4.5 INPUT BIAS CURRENT (pA) 60 2500 MAX44281 toc13 SUPPLY VOLTAGE (V) VIN = 150mV NO LOAD 80 0 0 INPUT BIAS CURRENT (pA) 100 4 NO LOAD 0.09 100 3 110 0.10 0.010 2 60 TEMPERATURE (°C) 0.045 200 1 10 -40 100 10 GAIN ACCURACY (%) 500 MAX44281 toc08 200 GAIN ACCURACY vs. INPUT VOLTAGE GAIN ACCURACY (%) 600 MAX44281 toc12 SUPPLY CURRENT (µA) 0.1 0.050 MAX44281 toc09 VIN = VDD /2 NO LOAD 0 INPUT OFFSET VOLTAGE (µV) 300 FREQUENCY (kHz) 800 700 400 0 0.01 MAX44281 toc10 0.1 500 100 1 0.01 600 MAX44281 toc11 1 100 VIN = VDD /2 NO LOAD 700 4.0 MAX44281 toc14 10 MAX44281U VOUT = VDD/2 SUPPLY CURRENT (µA) 100 800 MAX44281 toc07 MAX44281V VOUT = VDD/2 SUPPLY CURRENT vs. TEMPERATURE 1000 INPUT-REFERRED VOLTAGE-NOISE DENSITY (nV/√Hz) INPUT-REFERRED VOLTAGE-NOISE DENSITY (nV/√Hz) 1000 INPUT-REFERRED VOLTAGE-NOISE DENSITY vs. FREQUENCY MAX44281 toc06 INPUT-REFERRED VOLTAGE-NOISE DENSITY vs. FREQUENCY 3.5 3.0 2.5 2.0 1.5 1.0 -80 0.5 -100 0 -40 10 60 TEMPERATURE (°C) Maxim Integrated 110 0 -40 10 60 TEMPERATURE (°C) 110 0.1 1.1 2.1 3.1 INPUT VOLTAGE (V) 5 MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE SWING LOW vs. TEMPERATURE 3.297 3.296 3.295 3.294 3.293 3.292 2.0 MAX44281 toc16 3.298 0.010 0.008 1.9 1.8 SUPPLY VOLTAGE (V) 3.299 OUTPUT VOLTAGE SWING LOW (V) MAX44281 toc15 0.006 0.004 1.6 1.5 1.4 1.3 0.002 1.2 0 1.0 3.291 1.1 3.290 10 -40 60 110 -40 60 110 -40 10 60 110 TEMPERATURE (°C) TEMPERATURE (°C) CAPACITIVE-LOAD STABILITY vs. RESISTIVE LOAD ISOLATION RESISTANCE vs. CAPACITIVE-LOAD STABILITY SMALL-SIGNAL STEP RESPONSE vs. TIME UNSTABLE REGION 250 200 150 100 STABLE REGION MAX44281 toc20 MAX44281 toc19 300 14 ISOLATION RESISTANCE (Ω) MAX44281 toc18 350 50 10 TEMPERATURE (°C) 400 CAPACITIVE LOAD (pF) 1.7 12 INPUT 50mV/div VCC /2 STABLE REGION 10 8 UNSTABLE REGION 6 OUTPUT 50mV/div VCC /2 4 2 0 0 1k 100 10k 0 100k 500 1000 1500 1µs/div 2000 LOAD CAPACITANCE (pF) RESISTIVE LOAD (I) LARGE-SIGNAL STEP RESPONSE vs. TIME INPUT OFFSET VOLTAGE vs. TEMPERATURE MAX44281 toc21 100 VIN = 100mVP-P 90 OUTPUT 500mV/div VCC /2 OVERSHOOT (%) INPUT 500mV/div VCC /2 80 MAX44281 toc22 OUTPUT VOLTAGE SWING HIGH (V) 3.300 MINIMUM OPERATING VOLTAGE vs. TEMPERATURE MAX44281 toc17 OUTPUT VOLTAGE SWING HIGH vs. TEMPERATURE NEGATIVE OVERSHOOT 70 60 50 40 POSITIVE OVERSHOOT 30 20 10 1µs/div 0 0 100 200 300 400 500 600 CLOAD (pF) Maxim Integrated 6 MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp Bump Configuration TOP VIEW (BUMPS ON BOTTOM) MAX44281 1 2 A IN VDD B GND OUT + WLP Bump Description BUMP NAME FUNCTION A1 IN A2 VDD Positive Supply Voltage B1 GND Ground B2 OUT Output Maxim Integrated Input 7 MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp Driver for Interfacing with the MAX11645 ADC Detailed Description Rail-to-Rail Output Stage The MAX44281 is a high-bandwidth, low-power op amp in the smallest 4-bump WLP industry package. Its combination of precision, low-noise, and low-power specifications makes it ideal for use in a wide variety of sensor interface applications in portable consumer and medical equipment. Shutdown Mode The MAX44281 features shutdown functionality by pulling VDD to ground. During shutdown, both the input and the output are high-impedance. The input and output of the MAX44281 enter a high-impedance state when the device enters shutdown. Since shutdown is triggered by lowering the supply voltage to below 0.5V, the ESD protection diodes at the output limit the high-Z voltage range of the output. Diode D2 in Figure 2, from the output of the amplifier to VDD, is forward biased when the output voltage becomes too high in shutdown mode. The diodes combined with the low-voltage shutdown functionality effectively limit the high-impedance output range to plus and minus a diode voltage around ground (~P 0.6V). Driving Capacitive Loads Driving a capacitive load can cause instability in many op amps, especially those with low quiescent current. The MAX44281 is stable for a range of capacitive loads to above 400pF. Adding a series resistor between the output and the load capacitor improves the circuit’s response by isolating the load capacitance from the op amp’s output. See the Isolation Resistance vs. Capacitive-Load Stability graph in the Typical Operating Characteristics section for details. Applications Information The MAX44281 features low input voltage offset and low bias current, which makes the device ideal for singlesupply DC operations. However, its wide bandwidth and low noise make it suitable also for AC applications. The circuit in Figure 1 enables AC-coupled applications with the simple addition of two external resistors R1 and R2. Such resistors set the output bias voltage at midsupply. The values of R1 and R2 depend on the gain option of the device, according to the equation: The MAX44281’s tiny size and low noise make it a good fit for driving 12- to 16-bit resolution ADCs in space-constrained applications. The Typical Application Circuit shows the MAX44281 amplifier output connected to a lowpass filter driving the MAX11645 ADC. The MAX11645 is part of a family of 3V and 5V, 12-bit and 10-bit, 2-channel ADCs. The MAX11645 offers sample rates up to 94ksps and measures two single-ended inputs or one differential input. These ADCs dissipate 670FA at the maximum sampling rate, but just 6FA at 1ksps and 0.5FA in shut down. Offered in the ultra-tiny, 1.9mm x 2.2mm WLP and FMAX-8 packages, the MAX11645 ADCs are an ideal fit to pair with the MAX44281 amplifier in portable applications. Where higher resolution is required, refer to the MAX1069 (14-bit) and MAX1169 (16-bit) ADC families. VDD C VDD R1 IN VIN MAX44281 OUT R2 VOUT GND Figure 1. How to Use the MAX44281 in AC-Coupled Applications VDD D2 OUT D1 GND VDD x (R2/(R1 + R2)) = VDD/(2 x AV) Figure 2. Output ESD Protection Diodes Maxim Integrated 8 MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp Typical Application Circuit 15nF +5V 2.4kI 22kI MAX44281 10kI 330pF 3.3nF CORNER FREQUENCY = 10kHz ADC MAX11645 SALLEN-KEY FILTER WLP Applications Information profile, as well as the latest information on reliability test ing results, refer to Application Note 1891: Wafer-Level Packaging (WLP) and Its Applications. Package Information Ordering Information For the latest application details on WLP construction, dimensions, tape carrier information, PCB techniques, bump-pad layout, and recommended reflow temperature 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. PART TEMP RANGE PINPACKAGE FUNCTION MAX44281OANS+T* -40NC to +125NC 4 WLP Noninverting, AV = 1V/V PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. MAX44281VANS+T -40NC to +125NC 4 WLP Noninverting, AV = 2V/V 4 WLP N40A0-1 21-0612 Refer to Application Note 1891 MAX44281UANS+T -40NC to +125NC 4 WLP Noninverting, AV = 10V/V Maxim Integrated +Denotes a lead(Pb)-free/RoHS-compliant package. *Future product—contact factory for availability. 9 MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp Revision History REVISION NUMBER REVISION DATE 0 12/12 DESCRIPTION Initial release PAGES CHANGED — 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 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 © 2012 Maxim Integrated Products, Inc. 10 Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.