19-3684; Rev 1; 5/12 Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN The MAX1963A/MAX1976A low-dropout linear regulators operate from a +1.62V to +3.6V supply and deliver a guaranteed 300mA continuous load current with a low 100mV dropout. The high-accuracy (±0.5%) output voltage is preset to an internally trimmed voltage in the +0.75V to +3.0V range. An active-low, open-drain reset output remains asserted for at least 2.2ms (MAX1963A) or 70ms (MAX1976A) after the output voltage reaches regulation. These devices are offered in thin SOT23 and thin DFN packages. An internal pMOS pass transistor allows the low supply current to remain independent of load and dropout voltage, making these devices ideal for portable battery-powered equipment. Features o Low 1.62V Minimum Input Voltage o Guaranteed 300mA Output Current o ±2.5% Accuracy Over Load/Line/Temp o Low 100mV Dropout at 300mA Load o 2.2ms (MAX1963A) or 70ms (MAX1976A) RESET Output Flag o Supply Current Independent of Load and Dropout Voltage o Logic-Controlled Shutdown o Thermal-Overload and Short-Circuit Protection o Preset Output Voltages (0.75V to 3.0V) Applications o Tiny 6-Pin Thin SOT23 Package (<1.1mm High) o TDFN Package (<0.8mm High) Notebook/Handheld Computers Cellular/Smart/PDA Phones Ordering Information DSC, CD/MP3 Players PCMCIA Cards Pin Configurations MAX1976AETT_ _ _/V+T -40°C to +85°C 6 TDFN-6 3mm x 3mm GND -40°C to +85°C 8 TDFN-8 2mm x 2mm SHDN -40°C to +85°C 6 Thin SOT23-6 -40°C to +85°C 6 TDFN-6 3mm x 3mm 5 MAX1976AETA_ _ _+T 2 3 4 I.C. RESET OUT + 1 THIN SOT23 MAX1976AEZT_ _ _+T 6 MAX1963A MAX1976A 4 RESET -40°C to +85°C 8 TDFN-8 2mm x 2mm 7 5 I.C. SHDN 3 -40°C to +85°C 6 TDFN-6 3mm x 3mm MAX1963AETA_ _ _+T 8 6 OUT MAX1963A MAX1976A -40°C to +85°C 6 Thin SOT23-6 MAX1976AETT_ _ _+T N.C. GND 2 MAX1963AEZT_ _ _+T MAX1963AETT_ _ _+T N.C. + IN 1 TEMP RANGE PIN-PACKAGE IN TOP VIEW PART* *Insert the desired three-digit suffix (see the Selector Guide) into the blanks to complete the part number. Contact the factory for other output voltages. +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive-qualified part. Typical Operating Circuit IN SHDN GND TDFN 2mm x 2mm 6 5 4 INPUT 1.62V TO 3.6V CIN 1µF IN OUT MAX1963A MAX1976A MAX1963A MAX1976A UP TO 300mA OUTPUT 0.75V TO 3.0V COUT LOGIC 4.7µF SUPPLY 100kΩ 2 3 RESET OUT + 1 I.C. ON TDFN 3mm x 3mm RESET SHDN TO µC OFF GND Selector Guide appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX1963A/MAX1976A General Description MAX1963A/MAX1976A Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN ABSOLUTE MAXIMUM RATINGS IN, SHDN, RESET to GND .....................................-0.3V to +4.0V OUT to GND ................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (multilayer board, TA = +70°C) 6-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW 6-Pin TDFN (derate 23.8mW/°C above +70°C) ......1904.8mW 8-Pin TDFN (derate 11.9mW/°C above +70°C) ........953.5mW 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 Soldering Temperature (reflow) .......................................+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 (VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 4.7µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Input Voltage Input Undervoltage Lockout SYMBOL CONDITIONS MIN VIN VUVLO Output Voltage Accuracy 3.60 V 1.30 1.60 V IOUT = 1mA to 300mA, VIN = (VOUT + 0.5V) to +3.6V -2.5 +2.5 % Continuous 300 Current Limit ILIM VOUT = 96% of nominal value 450 ±0.5 mARMS 550 650 No load 70 140 IOUT = 300mA 90 Dropout (Note 2) Dropout Voltage UNITS 1.62 IOUT IQ MAX VIN rising or falling (180mV typical hysteresis) Maximum Output Current Ground Current TYP mA µA 70 VIN - VOUT IOUT = 300mA, VOUT ≥ 1.8V (Note 2) Load Regulation ∆VLDR IOUT = 1mA to 300mA Line Regulation ∆VLNR VIN = (VOUT + 0.5V) to +3.6V, IOUT = 1mA -0.15 100 200 mV 0.02 0.3 % +0.01 +0.15 % /V Output Noise 10Hz to 100kHz, IOUT = 10mA, VOUT = 1.5V 86 µVRMS PSRR f < 1kHz, IOUT = 10mA 70 dB SHUTDOWN Shutdown Supply Current SHDN Input Logic Levels SHDN Input Bias Current Turn-On Delay 2 IOFF SHDN = GND VIH VIN = 1.62V to 3.6V VIL VIN = 1.62V to 3.6V ISHDN VSHDN = 0V or 3.6V TA = +25°C 0.001 TA = +85°C 0.01 1 1.4 0.6 TA = +25°C 1 TA = +85°C 5 From SHDN high to OUT high, VOUT = 1.8V 90 _______________________________________________________________________________________ 100 µA V nA µs Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN (VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 4.7µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 80 82.5 85 %VOUT RESET OUTPUT Reset Threshold Accuracy VOUT falling (1.7% typical hysteresis) I RESET = 100µA 1 100 VIN = +1.0V, I RESET = 100µA 30 400 TA = +25°C 0.001 1 TA = +85°C 0.01 RESET Output Low Voltage VOL RESET Output High Leakage IOH V RESET = 3.6V, RESET not asserted Reset Delay tRP From VOUT high to RESET rising MAX1963A 2.2 3.2 5.5 MAX1976A 70 100 160 mV µA ms THERMAL PROTECTION Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis T SHDN +165 °C ∆T SHDN 15 °C Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design. Note 2: The dropout voltage is defined as VIN - VOUT, when VOUT is 4% lower than the value of VOUT when VIN = VOUT + 0.5V. Typical Operating Characteristics (VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.) 0 VOUT = +0.75V -0.1 0.25 IOUT = 0mA 0 IOUT = 100mA -0.25 IOUT = 300mA 0 50 100 150 200 LOAD CURRENT (mA) 250 300 VOUT = +1.5V 1.0 0.5 IOUT = 0mA, 100mA, 300mA 0 -0.5 -1.0 -1.5 -0.50 -0.2 1.5 MAX1963/76 toc03 VOUT = 1.5V OUTPUT VOLTAGE ACCURACY (%) VOUT = +1.5V MAX1963/76 toc02 0.1 0.50 OUTPUT VOLTAGE ACCURACY (%) MAX1963/76 toc01 OUTPUT VOLTAGE ACCURACY (%) 0.2 VOUT = +3.0V OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE OUTPUT VOLTAGE ACCURACY vs. INPUT VOLTAGE OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT 1.4 1.8 2.2 2.6 3.0 INPUT VOLTAGE (V) 3.4 -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 3 MAX1963A/MAX1976A ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.) GROUND-PIN CURRENT vs. INPUT VOLTAGE 100 VOUT = +1.5V 90 VOUT = +0.75V 80 70 IOUT = 100mA 100 IOUT = 300mA 80 60 IOUT = 0mA 40 120 MAX1963/76 toc06 MAX1963/76 toc05 GROUND-PIN CURRENT (µA) VOUT = +3.0V 110 120 MAX1963/76 toc04 120 GROUND-PIN CURRENT vs. TEMPERATURE 110 IOUT = 100mA GROUND-PIN CURRENT (µA) GROUND-PIN CURRENT vs. LOAD CURRENT GROUND-PIN CURRENT (µA) 100 90 IOUT = 300mA 80 IOUT = 0mA 70 20 60 VOUT = 1.5V 0 0.01 0.1 1 10 100 1000 50 1.2 1.6 LOAD CURRENT (mA) 2.0 2.4 2.8 3.2 3.6 -40 -20 INPUT VOLTAGE (V) DROPOUT VOLTAGE vs. LOAD CURRENT 20 40 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 80 MAX1963/76 toc07 120 100 80 0 TEMPERATURE (°C) VOUT = +0.75V 70 60 60 VOUT = +3.0V VOUT = +1.5V 50 PSRR (dB) VOUT = +1.8V MAX1963/76 toc08 60 VDROPOUT (mV) MAX1963A/MAX1976A Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN VOUT = +3.0V 40 30 40 20 20 10 IOUT = 10mA 0 0 0 50 100 150 200 250 0.1 300 10 MAX1963/76 toc09 1000 MAX1963/76 toc10 500mV/div 500mV/div VIN 1.8V VOUT 1.5V 1.5V VOUT 10mV/div AC-COUPLED 40µs/div 4 100 LINE-TRANSIENT RESPONSE NEAR DROPOUT LINE-TRANSIENT RESPONSE VIN 3.5V 1 FREQUENCY (kHz) LOAD CURRENT (mA) 10mV/div AC-COUPLED 40µs/div _______________________________________________________________________________________ 60 80 Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN LOAD-TRANSIENT RESPONSE NEAR DROPOUT LOAD-TRANSIENT RESPONSE MAX1963/76 toc11 MAX1963/76 toc12 200mA IOUT 20mA 200mA/div VOUT 20mV/div AC-COUPLED VIN = 3.6V VOUT = 1.5V 200mA IOUT 20mA 200mA/div VOUT 20mV/div AC-COUPLED 20µs/div VIN = 1.8V VOUT = 1.5V 20µs/div MAX1976 SHUTDOWN/RESET RESPONSE SHUTDOWN RESPONSE MAX1963/76 toc13 MAX1963/76 toc14 VSHDN VSHDN 1V/div 0 1V/div 0 VOUT VOUT 1V/div 0 1V/div VRESET 500mV/div 0 0 100µs/div 40ms/div MAX1976 LINE/RESET RESPONSE MAX1963/76 toc15 VIN 2V/div 0 VOUT 1V/div 0 VRESET 1V/div 0 200ms/div _______________________________________________________________________________________ 5 MAX1963A/MAX1976A Typical Operating Characteristics (continued) (VIN = (VOUT + 0.5V) or 1.8V, whichever is greater; SHDN = IN, CIN = 1µF, COUT = 4.7µF, TA = +25°C, unless otherwise noted.) MAX1963A/MAX1976A Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN Pin Description PIN THIN SOT23 6-PIN TDFN (3mm x 3mm) 8-PIN TDFN (2mm x 2mm) NAME FUNCTION 1 6 8 IN Regulator Input. Supply voltage can range from +1.62V to +3.6V. Bypass IN with at least a 1µF ceramic capacitor to GND (see the Capacitor Selection and Regulator Stability section). 2 — — GND Ground. GND also functions as a heatsink. Solder to a large pad or circuitboard ground plane to maximize SOT23 power dissipation. — 4 5 GND Ground 3 5 6 SHDN Active-Low Shutdown Input. A logic-low reduces supply current to below 1µA. Connect to IN or logic-high for normal operation. Open-Drain, Active-Low Reset Output. RESET rises 3.2ms (MAX1963A) or 100ms (MAX1976A) after the output has achieved regulation. RESET falls immediately if VOUT drops below 82.5% of its nominal voltage, or if the MAX1963A/MAX1976A are shut down. 4 3 4 RESET 5 2 3 I.C. Internally Connected. Leave unconnected or connect to GND. 6 1 1 OUT Regulator Output. Sources up to 300mA. Bypass with a 4.7µF low-ESR ceramic capacitor to GND. — — 2, 7 N.C. No Connection. Not internally connected. — — — EP Ground (TDFNs only). EP also functions as a heatsink. Solder EP to a large pad or circuit-board ground plane to maximize TDFN power dissipation. IN SHDN SHUTDOWN LOGIC ERROR AMP MOS DRIVER WITH ILIMIT P OUT MAX1963A MAX1976A THERMAL SENSOR REF 82.5% REF RESET TIMER GND Figure 1. Functional Diagram 6 _______________________________________________________________________________________ Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN The MAX1963A/MAX1976A are low-dropout, high-accuracy, low-quiescent-current linear regulators designed primarily for battery-powered applications. These devices supply loads up to 300mA and are available with preset output voltages from +0.75V to +3.0V. As illustrated in Figure 1, the MAX1963A/MAX1976A consist of a reference, an error amplifier, a p-channel pass transistor, an internal feedback voltage-divider, and a power-good comparator. The reference is connected to the error amplifier, which compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, which allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the pass-transistor gate is pulled up, allowing less current to pass to the output. Internal p-Channel Pass Transistor The MAX1963A/MAX1976A feature a 0.33Ω (RDS(ON)) p-channel MOSFET pass transistor. Unlike similar designs using pnp pass transistors, p-channel MOSFETs require no base drive, which reduces quiescent current. The pnp-based regulators also waste considerable current in dropout when the pass transistor saturates and use high base-drive currents under large loads. The MAX1963A/MAX1976A do not suffer from these problems and consume only 90µA (typ) of quiescent current under heavy loads, as well as in dropout. Shutdown Pull SHDN low to enter shutdown. During shutdown, the output is disconnected from the input, an internal 1.5kΩ resistor pulls OUT to GND, RESET is actively pulled low, and the supply current drops below 1µA. RESET Output The MAX1963A/MAX1976A microprocessor (µP) supervisory circuitry asserts a guaranteed logic-low reset during power-up, power-down, and brownout conditions down to +1V. RESET asserts when VOUT is below the reset threshold and remains asserted for at least tRP after VOUT rises above the reset threshold of regulation. Current Limit The MAX1963A/MAX1976A monitor and control the pass transistor’s gate voltage, limiting the output current to 450mA (min). If the output exceeds ILIM, the MAX1963A/ MAX1976A output voltage drops. Thermal-Overload Protection Thermal-overload protection limits total power dissipation in the MAX1963A/MAX1976A. When the junction temperature exceeds TJ = +165°C, a thermal sensor turns off the pass transistor, allowing the IC to cool. The thermal sensor turns the pass transistor on again after the junction temperature cools by 15°C, resulting in a pulsed output during continuous thermal-overload conditions. Thermal-overload protection safeguards the MAX1963A/MAX1976A in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction-temperature rating of TJ = +150°C. Operating Region and Power Dissipation The MAX1963A/MAX1976A maximum power dissipation depends on the thermal resistance of the IC package and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The power dissipated in the device is P = IOUT (VIN - VOUT). The maximum allowed power dissipation is: PMAX = (TJ(MAX) - TA) / (θJC + θCA) where (T J(MAX) - T A ) is the temperature difference between the MAX1963A/MAX1976A die junction and the surrounding air, θJC is the thermal resistance of the junction to the case, and θCA is the thermal resistance from the case through the PC board, copper traces, and other materials to the surrounding air. For best heatsinking, expand the copper connected to the exposed paddle or GND. The MAX1963A/MAX1976A deliver up to 300mA and operate with an input voltage up to +3.6V. However, when using the 6-pin SOT23 version, high output currents can only be sustained when the input-output differential voltage is less than 2V, as shown in Figure 2. The maximum allowed power dissipation for the 6-pin TDFN is 1.951W at TA = +70°C. Figure 3 shows that the maximum input-output differential voltage is not limited by the TDFN package power rating. Applications Information Capacitor Selection and Regulator Stability Capacitors are required at the MAX1963A/MAX1976A input and output for stable operation over the full temperature range and with load currents up to 300mA. Connect a 1µF ceramic capacitor between IN and GND and a 4.7µF low-ESR ceramic capacitor between OUT and GND. The input capacitor (CIN) lowers the source impedance of the input supply. Use larger output capacitors to reduce noise and improve load-transient response, stability, and power-supply rejection. The output capacitor’s equivalent series resistance (ESR) affects stability and output noise. Use output _______________________________________________________________________________________ 7 MAX1963A/MAX1976A Detailed Description MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT) MAXIMUM OUTPUT CURRENT (mA) 400 TA = +85°C TA = +70°C 300 100 0 0.5 1.0 1.5 2.0 2.5 3.0 (VIN - VOUT) (V) Figure 2. Power Operating Regions for the 6-Pin SOT23: Maximum Output Current vs. Input Voltage MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT) 400 TA = +85°C MAXIMUM RECOMMENDED OUTPUT CURRENT 6-PIN TDFN 3mm x 3mm The MAX1963A/MAX1976A are designed to operate with low dropout voltages and low quiescent currents in battery-powered systems while still maintaining good noise, transient response, and AC rejection. See the Typical Operating Characteristics for a plot of PowerSupply Rejection Ratio (PSRR) versus Frequency. When operating from noisy sources, improved supplynoise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. The MAX1963A/MAX1976A load-transient response (see the Typical Operating Characteristics) shows two components of the output response: a near-zero DC shift from the output impedance due to the load-current change, and the transient response. A typical transient response for a step change in the load current from 20mA to 200mA is 20mV. Increasing the output capacitor’s value and decreasing the ESR attenuates the overshoot. Input-Output (Dropout) Voltage 300 200 100 0 0 0.5 1.0 1.5 2.0 2.5 3.0 (VIN - VOUT) (V) Figure 3. Power Operating Regions for the 6-Pin TDFN: Maximum Output Current vs. Input Voltage 8 capacitors with an ESR of 30mΩ or less to ensure stability and optimize transient response. Surface-mount ceramic capacitors have very low ESR and are commonly available in values up to 10µF. Connect CIN and COUT as close to the MAX1963A/MAX1976A as possible to minimize the impact of PC board trace inductance. Noise, PSRR, and Transient Response MAXIMUM RECOMMENDED OUTPUT CURRENT 6-PIN SOT23 200 0 MAXIMUM OUTPUT CURRENT (mA) MAX1963A/MAX1976A Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN A regulator’s minimum input-output voltage difference (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX1963A/MAX1976A use a p-channel MOSFET pass transistor, the dropout voltage is a function of drain-tosource on-resistance (RDS(ON) = 0.33Ω) multiplied by the load current (see the Typical Operating Characteristics). VDROPOUT = VIN - VOUT = 0.33Ω IOUT The MAX1963A/MAX1976A ground current reduces to 70µA in dropout. _______________________________________________________________________________________ Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN VOUT (V) MAX1963A TOP MARK MAX1976A TOP MARK SUFFIX SOT TDFN (3mm x 3mm) TDFN (2mm x 2mm) SOT TDFN (3mm x 3mm) TDFN (2mm x 2mm) 0.75 075 AACJ ALM — AACU ALX — 0.85 085 — — — AACV ALY — 0.90 090 AACK ALN — AACW ALZ — 1.00 100 AACL ALO — AACX AMA — 1.10 110 AACM ALP — AACY AMB — 1.20 120 AACN ALQ — AACZ AMC — 1.30 130 AACO ALR — AADA AMD AAD 1.50 150 AACP ALS — AADB AME AAE 1.60 160 — — — AADC AMF — 1.80 180 AACQ ALT — AADD AMG — 1.85 185 AACR ALU — AADE AMH — 2.50 250 AACS ALV — AADF AMI — 2.85 285 — — — AADG AMJ — 3.00 300 AACT ALW — AADH AMK — 1.20 120/V — — — — AUO — 1.50 150/V — — — — AVI — 1.80 180/V — — — — AUP — Note: Standard voltage options, shown in bold, are available. Contact the factory for other output voltages between 1.5V and 4.5V. Minimum order quantity is 15,000 units. Package Information Chip Information PROCESS: BiCMOS For the latest package outline information and land patterns (footprints), go to www.maxim-ic.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. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 6 TDFN-EP T633+2 21-0137 90-0058 6 SOT-23 Z6+1 21-0114 90-0242 T822+1 21-0168 90-0064 8 TDFN-EP _______________________________________________________________________________________ 9 MAX1963A/MAX1976A Selector Guide MAX1963A/MAX1976A Low-Input-Voltage, 300mA LDO Regulators with RESET in SOT and TDFN Revision History REVISION NUMBER REVISION DATE 0 5/05 Initial release 1 5/12 Added lead-free packaging information to the data sheet, updated Selector Guide and Pin Description DESCRIPTION PAGES CHANGED — 1, 6, 9 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. 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.