MAX14523A_11

19-4814; Rev 1; 1/11 250mA to 1.5A, Adjustable Current-Limit Switches General Description The MAX14523A/MAX14523AL/MAX14523B/MAX14523C programmable current-limit switches feature internal current limiting to prevent damage to host devices due to faulty load conditions. These current-limit switches feature a low 70mΩ on-resistance and operate from a +1.7V to +5.5V input voltage range. The current limit is adjustable from 250mA to 1.5A, making these devices ideal for SDIO (secure digital input/output) and other load-switching applications. Each device in the family handles an overcurrent event differently depending on the option selected. The MAX14523A/MAX14523AL go into an autoretry mode, the MAX14523B latches off the switch, and the MAX14523C features a continuous current-limit mode. Additional safety features include thermal shutdown to prevent overheating and reverse-current blocking to prevent current from being driven back into the source. The MAX14523A/MAX14523AL/MAX14523B/MAX14523C are available in a tiny 8-pin, 3mm x 3mm, TDFN package and operate over the -40°C to +125°C automotive temperature range. ♦ Adjustable Current-Limit Threshold ♦ Low-Dropout Voltage (70mV at 1A Load Current) ♦ Short-Circuit Protection ♦ Thermal-Shutdown Protection ♦ Reverse-Current Protection ♦ 170µA (typ) Supply Current ♦ Shutdown Reverse Current, 0.6µA (max) ♦ +1.7V to +5.5V Supply Voltage Range ♦ Tiny 8-Pin, 3mm x 3mm, TDFN Package Features ♦ Accurate (±10%) Overload Current Limit MAX14523A/MAX14523AL/MAX14523B/MAX14523C Typical Operating Circuit BIAS VOLTAGE POWER SUPPLY IN 1μF CHARGE PUMP OUT 1μF LOAD Applications SDIO Ports USB Ports μP VPULLUP RSETI CURRENT REFERENCE CONTROL LOGIC Notebook VGA Ports GPS Cell Phones MP3 Players UTCA/ATCA Platforms *ON FOR THE MAX14523AL ONLY. GND 10kΩ FLAG ON(ON)* N.C. MAX14523A MAX14523AL MAX14523B MAX14523C Pin Configuration appears at end of data sheet. Ordering Information/Selector Guide PART MAX14523A ATA+ MAX14523ALATA+** MAX14523B ATA+ MAX14523BATA/V+T MAX14523C ATA+ PIN-PACKAGE 8 TDFN-EP* 8 TDFN-EP* 8 TDFN-EP* 8 TDFN-EP* 8 TDFN-EP* TOP MARK BLO BLP BLQ BLQ BLS ON POLARTIY Active-High Active-Low Active-High Active-High Active-High OVERCURRENT RESPONSE Autoretry Autoretry Latch-Off Latch-Off Continuous Note: All devices are specified over the -40°C to +125°C operating temperature range. +Denotes a lead(Pb)-free package/RoHs-compliant package. /V denotes an automotive qualified part. *EP = Exposed pad. **Future product—contact factory for availability. ________________________________________________________________ Maxim Integrated Products 1 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. 250mA to 1.5A, Adjustable Current-Limit Switches MAX14523A/MAX14523AL/MAX14523B/MAX14523C ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) IN, ON, ON, FLAG, OUT, and SETI to GND .............-0.3V to +6V Current into Any Pin (Except IN, OUT)................................20mA Out Short Circuit to GND...................................Internally Limited Continuous Power Dissipation (TA = +70°C) for multilayer board: TDFN (derate 24.4mW/°C above +70°C)...................1952mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°C PACKAGE THERMAL CHARACTERISTICS (Note 1) TDFN Junction-to-Ambient Thermal Resistance (θJA) ...........41°C/W Junction-to-Case Thermal Resistance (θJC) ..................8°C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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 = +1.7V to +5.5V, RSETI = 94.2kΩ, CIN = COUT = 1µF, and TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at VIN = +3.3V, TA = +25°C.) (Note 2) PARAMETER SUPPLY OPERATION Operating Voltage Quiescent Current Latchoff Current Shutdown Forward Current Shutdown Reverse Current INTERNAL FET Switch-On Resistance Forward-Current Limit (RSETI + 2.48k ) × ILIM Product Reverse Blocking Current Reverse Blocking Threshold FLAG A ssertion Drop Voltage Threshold ON, ON INPUT ON, ON Input Leakage ON, ON Input Logic-High Voltage ON, ON Input Logic-Low Voltage ILEAK VIH VIL VON, VON = VIN or VGND -1 1.6 0.4 +1 μA V V VOUT - VIN VFA R ON ILIM VIN = 3.3V, I OUT lower than ILIM RSETI = 9 1.78k , VIN - VOUT = 1V RSETI = 5 63.12k , VIN - VOUT = 1V ILIM = 2 50mA to 1500mA, VIN - VOUT = 1V VOUT > VIN + 1 40mV, after reverse-currentlimit shutdown VOUT - VIN = 3 00mV, OUT falling until switch turns on Increase (VIN - VOUT) drop until F LAG a sserts, I OUT limiting, VIN = 3.3V 40 95 350 1350 225 127.2 70 1500 250 141.4 130 1650 275 155.5 2 140 m mA kV μA mV mV VIN IQ ILATCH I SHDN IRSHDN I OUT = 0 A, switch on, VIN = 3.3V VIN = 3.3V, I OUT = 0 A , after an overcurrent fault (MAX14523B) VON = 0V, VON = VIN, VIN = 5.5V, VOUT = 0V VON = 0V, VON = VIN, VIN = 1 .7V, VOUT = 5.5V (current into OUT) 1.7 170 10 0.5 0.01 5.5 300 20 7 0.6 V μA μA μA μA SYMBOL CONDITIONS MIN TYP MAX UNITS 2 _______________________________________________________________________________________ 250mA to 1.5A, Adjustable Current-Limit Switches ELECTRICAL CHARACTERISTICS (continued) (VIN = +1.7V to +5.5V, RSETI = 94.2kΩ, CIN = COUT = 1µF, and TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at VIN = +3.3V, TA = +25°C.) (Note 2) PARAMETER FLAG OUTPUT FLAG Output Logic-Low Voltage FLAG Output Leakage Current D YNAMIC Turn-On Time Turn-Off Time Current-Limit Reaction Time B lanking Time Retry Time THERMAL PROTECTION Thermal Shutdown Thermal Shutdown Hysteresis Low-to-high +170 15 °C °C t SS t OFF tLIM tBLANK tRETRY T ime from ENABLE signal to V OUT = 90% of VIN = 3.3V, Figure 1 T ime from DISABLE signal to VOUT = 10% of VIN = 3.3V, RL = 2 0 , F igure 1 VIN = 3.3V, RSETI = 9 1.78k to 563.12k , output high and then short-circuit applied (Note 3) M AX14523A/MAX14523AL (Note 3) 10 320 1 250 3 14.5 25 875 ms μs μs ms ms ISINK = 1 mA VIN = VFLAG = 5 .5V, F LAG deasserted 0.4 1 V μA SYMBOL CONDITIONS MIN TYP MAX UNITS MAX14523A/MAX14523AL/MAX14523B/MAX14523C Note 2: All devices are 100% tested at 125°C. Electrical limits across the full temperature range are guaranteed by design and correlation. t Note 3: Blanking time and retry time are generated by the same oscillator. Therefore, the ratio of RETRY is a constant value of 32. tBLANK See Figures 2 and 3. ON(ON)* tSS 90% VIN VOUT tOFF 10% VIN *( ) THE POLARITY OF THE SIGNAL IS REVERSED FOR THE MAX14523AL ONLY. Figure 1. Timing Diagram for Measuring Turn-On Time (tSS) and Turn-Off Time (tOFF) _______________________________________________________________________________________ 3 250mA to 1.5A, Adjustable Current-Limit Switches MAX14523A/MAX14523AL/MAX14523B/MAX14523C tBLANK tRETRY tBLANK tRETRY tBLANK tBLANK OUT CURRENT LIMIT LOAD CURRENT THE DEVICE GOES TO THERMAL-SHUTDOWN MODE FLAG Figure 2. Autoretry Fault Diagram tBLANK tBLANK OUT CURRENT LIMIT LOAD CURRENT THE DEVICE GOES TO THERMAL-SHUTDOWN MODE FLAG Figure 3. Latchoff Fault Diagram 4 _______________________________________________________________________________________ 250mA to 1.5A, Adjustable Current-Limit Switches Typical Operating Characteristics (VIN = +3.3V, CIN = 1µF, COUT = 1µF, RSETI = 94.2kΩ, TA = +25°C, unless otherwise noted.) MAX14523A/MAX14523AL/MAX14523B/MAX14523C CURRENT LIMIT vs. SUPPLY VOLTAGE MAX14523A toc01 NORMALIZED CURRENT LIMIT vs. TEMPERATURE MAX14523A toc02 QUIESCENT SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX14523A toc03 1.60 1.10 300 QUIESCENT SUPPLY CURRENT (μA) 1.55 CURRENT LIMIT (A) NORMALIZED CURRENT LIMIT 1.05 250 1.50 1.00 200 1.45 0.95 150 1.40 1.70 2.65 3.60 4.55 5.50 SUPPLY VOLTAGE (V) 0.90 -40 -7 26 59 92 125 TEMPERATURE (°C) 100 1.70 2.65 3.60 4.55 5.50 SUPPLY VOLTAGE (V) QUIESCENT SUPPLY CURRENT vs. TEMPERATURE MAX14523A toc04 SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE MAX14523A toc05 SHUTDOWN FORWARD CURRENT vs. TEMPERATURE SHUTDOWN FORWARD CURRENT (μA) 9 8 7 6 5 4 3 2 1 0 VIN = +1.7V VIN = +5.5V VON = 0V, VOUT = 0V MAX14523A toc06 300 QUIESCENT SUPPLY CURRENT (μA) 10 QUIESCENT SUPPLY CURRENT (μA) 9 8 7 6 5 4 3 2 1 VON = 0V 10 250 VIN = +5V 200 VIN = +5V 150 VIN = +3.3V 100 -40 -7 26 59 92 125 TEMPERATURE (°C) VIN = +3.3V 0 -40 -7 26 59 92 125 TEMPERATURE (°C) -40 -7 26 59 92 125 TEMPERATURE (°C) _______________________________________________________________________________________ 5 250mA to 1.5A, Adjustable Current-Limit Switches MAX14523A/MAX14523AL/MAX14523B/MAX14523C Typical Operating Characteristics (continued) (VIN = +3.3V, CIN = 1µF, COUT = 1µF, RSETI = 94.2kΩ, TA = +25°C, unless otherwise noted.) SHUTDOWN REVERSE CURRENT vs. TEMPERATURE SHUTDOWN REVERSE CURRENT (μA) 9 8 7 6 5 4 3 2 1 0 -40 -7 26 59 92 125 TEMPERATURE (°C) 0 -40 -7 VON = 0V, VIN = +1.7V, VOUT = +5.5V MAX14523A toc07 LATCHOFF CURRENT vs. TEMPERATURE MAX14523B 25 LATCHOFF CURRENT (μA) VIN = +5.5V 20 15 10 5 VIN = +3.3V 26 59 92 125 MAX14523A toc08 NORMALIZED ON-RESISTANCE vs. SUPPLY VOLTAGE 1.15 NORMALIZED ON-RESISTANCE 1.10 1.05 1.00 0.95 0.90 0.85 0.80 1.70 2.65 3.60 VOLTAGE (V) 4.55 5.50 MAX14523A toc09 10 30 1.20 TEMPERATURE (°C) NORMALIZED ON-RESISTANCE vs. SUPPLY TEMPERATURE MAX14523A toc10 SWITCH TURN-ON TIME vs. SUPPLY TEMPERATURE MAX14523A toc11 SWITCH TURN-OFF TIME vs. SUPPLY TEMPERATURE 900 SWITCH TURN-OFF TIME (μs) 800 700 600 500 400 300 200 100 0 VIN = +3.3V -40 -7 26 59 92 125 VIN = +5.0V RLOAD = 20Ω MAX14523A toc12 1.5 1.4 NORMALIZED ON-RESISTANCE 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 -40 -7 26 59 92 1.5 1.4 SWITCH TURN-ON TIME (ms) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 RLOAD = 20Ω VIN = +5.0V 1000 VIN = +3.3V 125 -40 -7 26 59 92 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 6 _______________________________________________________________________________________ 250mA to 1.5A, Adjustable Current-Limit Switches Typical Operating Characteristics (continued) (VIN = +3.3V, CIN = 1µF, COUT = 1µF, RSETI = 94.2kΩ, TA = +25°C, unless otherwise noted.) MAX14523A/MAX14523AL/MAX14523B/MAX14523C CURRENT LIMIT RESPONSE MAX14523A toc13 CURRENT LIMIT RESPONSE MAX14523A toc14 FLAG RESPONSE (OVERLOAD CONDITION) MAX14523A toc15 SUDDEN SHORT APPLIED AT OUTPUT VOUT 2V/div RLOAD = 16.5Ω TO SUDDEN SHORT APPLIED AT OUTPUT VOUT 2V/div RLOAD = 16.5Ω TO SUDDEN SHORT APPLIED AT OUTPUT VFLAG 2V/div IOUT 10A/div IOUT 1A/div IOUT 1A/div 2μs/div 20ms/div 20ms/div Pin Description PIN MAX14523AL 1, 6 2 MAX14523A MAX14523B MAX14523C 1, 6 2 NAME FUNCTION N.C. FLAG No Connection. Not internally connected. Connect N.C. to GND or leave unconnected. Open-Drain, Overload Indicator Output. FLAG goes low when the overload fault duration exceeds the blanking time, reverse current is detected, thermal shutdown mode is active, or SETI is connected to ground. Overload-Current Limit Adjust. Connect a resistor from SETI to GND to program the overcurrent limit. If SETI is connected to GND the switch turns off and F LAG i s asserted. If SETI is unconnected the current limit is at 0mA. Do not connect any capacitance larger than 20pF to SETI. Switch Output. Bypass OUT with a 1μF capacitor to GND. Power Input. Bypass IN with a 1μF ceramic capacitor to GND. Use higher capacitance if necessary to prevent large load transients from pulling down the supply voltage. Active-Low, Switch-ON Input. Drive ON low to turn on the switch. Active-High, Switch-ON Input. Drive ON high to turn on the switch. Ground Exposed Pad. Internally connected to GND. For enhanced thermal dissipation, connect EP to a large copper ground plane. Do not use EP as the sole ground connection. 3 3 SETI 4 5 7 4 5 OUT IN ON 7 8 — 8 — ON GND EP _______________________________________________________________________________________ 7 250mA to 1.5A, Adjustable Current-Limit Switches MAX14523A/MAX14523AL/MAX14523B/MAX14523C Functional Diagram REVERSECURRENT PROTECTION IN THERMAL SHUTDOWN BUFFER OUT CONTROL LOGIC FLAG N.C. TIMING CIRCUITRY MAX14523A MAX14523AL MAX14523B MAX14523C ON/(ON)* BANDGAP REFERENCE CURRENT LIMIT BUFFER SETI GND *( ) FOR THE MAX14523AL ONLY Detailed Description The MAX14523A/MAX14523AL/MAX14523B/MAX14523C programmable current-limit switches operate from +1.7V to +5.5V and provide internal current limiting adjustable from 250mA to 1.5A. These devices feature a fixed blanking time, and a FLAG output that notifies the processor when a fault condition is present. Autoretry (MAX14523A/MAX14523AL) When the forward current reaches the current threshold, the tBLANK timer begins counting (Figure 2). FLAG asserts if the overcurrent condition is present for tBLANK or longer. The timer resets if the overcurrent condition disappears before the blanking time (tBLANK) has elapsed. A retry time delay (tRETRY) starts immediately after the blanking time has elapsed. During that time, the switch latches off. At the end of tRETRY, the switch turns on again. If the fault still exists, the cycle repeats. If the fault has been removed, the switch stays on. During this cycle, FLAG stays low. In autoretry, if the die temperature exceeds +170°C (typ) due to self heating, the MAX14523A/MAX14523AL go into thermal shutdown until the die temperature drops by approximately 15°C (see the Thermal Shutdown section.) Programmable Current Limit/Threshold A resistor from SETI to GND sets the current limit/threshold for the switch (see the S etting the Current Limit/Threshold section). If the output current is limited at the current threshold value for a time equal to or longer than tBLANK, the output flag asserts and the MAX14523A/MAX14523AL enter the autoretry mode, the MAX14523B latches off the switch, and the MAX14523C enters the continuous current-limit mode. 8 _______________________________________________________________________________________ 250mA to 1.5A, Adjustable Current-Limit Switches The autoretry feature saves system power in case of an overcurrent or short-circuit condition. During tBLANK time, when the switch is on, the supply current is held at the current limit. During time tRETRY, when the switch is off, the current through the switch is zero. Thus, the average output current is much less than the programmed current limit. Calculate the average output current using the following equation: ILOAD = ILIM [(tBLANK )/(tBLANK + tRETRY)] With a typical tBLANK = 17.5ms and typical tRETRY = 560ms, the duty cycle is 3%, resulting in a 97% power savings over the switch being on the entire time. Switch-On/Off Control The ON input for the MAX14523A/MAX14523B/ MAX14523C and ON input for the MAX14523AL control the switch, see Table 1. Toggle ON for the MAX14523B to reset the fault condition once the short-circuit current is detected and the device shuts down. MAX14523A/MAX14523AL/MAX14523B/MAX14523C Reverse-Current Protection The MAX14523A/MAX14523AL/MAX14523B/MAX14523C feature a reverse-current protection circuit that limits the backflow current to 2µA when the reverse-current protection circuitry has tripped. The switch turns off and FLAG asserts without waiting for tBLANK to elapse. The switch turns back on and FLAG deasserts when VIN V OUT drops below the reverse-current threshold by 95mV (typ). Latchoff (MAX14523B) When the forward current reaches the current threshold, the tBLANK timer begins counting (Figure 3). FLAG asserts if an overcurrent condition is present for greater than tBLANK time. The timer resets if the overcurrent condition disappears before t BLANK has elapsed. The switch turns off if the overcurrent condition continues beyond the blanking time. Reset the switch by either toggling the control logic (ON or ON) or cycling the input voltage. If the die temperature exceeds +170°C (typ) due to self heating, the MAX14523B goes into thermal shutdown until the die temperature drops by approximately 15°C (see the T hermal Shutdown section). FLAG Indicator FLAG is an open-drain fault indicator output and requires an external pullup resistor to a DC supply. FLAG goes low when any of the following conditions occur: • • • • The blanking time has elapsed The reverse-current protection has tripped The die temperature exceeds +170°C SETI is connected to ground. Thermal Shutdown Thermal-shutdown circuitry protects the devices from overheating. The switch turns off and FLAG goes low immediately when the junction temperature exceeds +170 ° C (typ). The switch turns on again after the device temperature drops by approximately 15°C (typ). Continuous Current Limit (MAX14523C) When the forward current reaches the forward-current threshold, the MAX14523C limits the output current to the programmed current limit. FLAG asserts if the current limit is present for tBLANK and deasserts when the overload condition is removed. In this mode, if die temperature exceeds +170°C (typ) due to self heating, the MAX14523C goes into thermal shutdown until the die temperature drops by approximately 15°C (see the Thermal Shutdown section). Applications Information Setting the Current Limit/Threshold A resistor from SETI to ground programs the current limit/threshold value for the MAX14523A/MAX14523AL/ MAX14523B/MAX14523C. Table 2 lists various current limit/thresholds set by different resistor values at SETI. Leaving SETI unconnected selects a 0 current limit/threshold. Connecting SETI to ground asserts FLAG. Use the following formula to calculate the current limit: RSETI(kΩ) = 141400(V) − 2.48(kΩ) ILIM (mA) Table 1. Switch Truth Table MAX14523A MAX14523B MAX14523C ON 0 1 MAX14523AL ON 1 0 Off On SWITCH STATUS _______________________________________________________________________________________ 9 250mA to 1.5A, Adjustable Current-Limit Switches MAX14523A/MAX14523AL/MAX14523B/MAX14523C Table 2. Current Limit/Threshold vs. Resistor Values RSETI (k ) 91.78 121 221 301 422 563.12 (Open) TYPICAL CURRENT LIMIT/THRESHOLD (mA) 1500 1145 632 466 333 250 0 change is minimal. If the output is continuously shorted to ground at the maximum supply voltage, the operation of the switches with the autoretry option does not cause problems because the total power dissipated during the short is scaled by the duty cycle: P(MAX) = VIN(MAX) × IOUT(MAX) × tBLANK tRETRY + tBLANK Attention must be given to the MAX14523C continuous current-limit version when the power dissipation during a fault condition can cause the device to reach the thermal shutdown threshold. Do not use an RSETI value smaller than 91.78kΩ. Note: Connecting any capacitance larger than 20pF to SETI can cause instability. Chip Information PROCESS: BiCMOS IN Bypass Capacitor Connect a minimum of 1µF capacitor from IN to GND to limit the input voltage drop during momentary output short-circuit conditions. Larger capacitor values further reduce the voltage undershoot at the input. N.C. 1 2 3 4 Pin Configuration OUT Bypass Capacitor For stable operation over the full temperature range and over the full-programmable current-limit range, use a 1µF ceramic capacitor from OUT to ground. Excessive output capacitance can cause a false overcurrent condition due to decreased dv/dt across the capacitor. Calculate the maximum capacitive load (CMAX) value that can be connected to OUT using the following formula: CMAX (µF) = ILIM (mA) × tBLANK(MIN) (ms) VIN (V) FLAG SETI OUT + MAX14523A MAX14523AL MAX14523B MAX14523C *EP 8 7 6 5 GND ON(ON)** N.C. IN TDFN 3mm x 3mm *CONNECT EXPOSED PAD TO GND. **( ) FOR THE MAX14523AL ONLY. For example, for VIN = 3.3V, tBLANK = 10ms, and ILIM = 300mA, CMAX equals 909µF. Package Information For the latest package outline information and land patterns, 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 8 TDFN-EP PACKAGE CODE T833+2 OUTLINE NO. 21-0137 LAND PATTERN NO. 90-0059 Layout and Thermal Dissipation To optimize the switch response time to output shortcircuit conditions, it is very important to keep all traces as short as possible to reduce the effect of undesirable parasitic inductance. Place input and output capacitors as close as possible to the device (no more than 5mm). IN and OUT must be connected with wide short traces to the power bus. During normal operation, the power dissipation is small and the package temperature 10 ______________________________________________________________________________________ 250mA to 1.5A, Adjustable Current-Limit Switches Revision History REVISION NUMBER 0 1 REVISION DATE 7/09 1/11 Initial release Added the MAX14523BATA automotive-grade part to the Ordering Information DESCRIPTION PAGES CHANGED — 1 MAX14523A/MAX14523AL/MAX14523B/MAX14523C 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 © 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.