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| 19-4461; Rev 1; 4/09 Low-Resistance DPDT Switches with Negative Rail General Description The MAX14535E-MAX14539E are low on-resistance and high ESD-protected DPDT switches that multiplex analog signals, such as AC-coupled audio or video. These devices combine the low on-capacitance (CON) and low on-resistance (RON) necessary for high-performance switching applications in portable electronics, and include an internal negative supply to pass audio signals that swing below ground (down to -1.5V). The MAX14535E/MAX14537E/MAX14539E feature internal shunt resistors on the normally open path (and normally closed path, (MAX14539E)) to reduce clicks and pops heard at the output. The MAX14535E- MAX14539E have an enable input (EN) to reduce supply current and set all channels to high-impedance when driven low. When EN is driven low, the MAX14537E/MAX14538E have the lowest possible current consumption, but cannot withstand negative rail signals. The MAX14535E/MAX14536E/MAX14539E can still withstand a negative signal to NC_, NO_, or COM_ from -1.5V to min (VCC, 3V.) The MAX14535E-MAX14539E operate from a +2.4V to +5.5V supply. These devices can be powered from the typical analog supply voltage in a cell phone (+2.5V to +2.8V) or a lithium-ion (Li+) battery (about 4.3V max). The MAX14535E-MAX14539E have high ESD protection, up to 15kV on COM_, and the NC_, NO_, and COM_ voltage can go up to 3.6V when VCC = 0 without damaging the devices. All devices are offered in a space-saving, 10-pin, 1.4mm x 1.8mm UTQFN package, and operate over the -40C to +85C extended temperature range. o Low 0.135 (typ) On-Resistance o Low 0.3m (typ) RON Flatness o Single +2.4V to +5.5V Supply Voltage o Pass Audio Signal Between -1.5V and min (VCC, 3V) o Internal Shunt Resistors for Click-and-Pop Reduction (MAX14535E/MAX14537E/MAX14539E) o Withstand 3.6V (max) Applied to NC_, NO_, and COM_ when VCC = 0V o High ESD Protection: Up to 15kV on COM_ o 10-Pin UTQFN (1.4mm x 1.8mm) Package o -40C to +85C Operating Temperature Range Features MAX14535E-MAX14539E Applications Cell Phones MP3 Players Notebook Computers PDAs Ordering Information/Selector Guide PART MAX14535EEVB+ MAX14536EEVB+ MAX14537EEVB+* MAX14538EEVB+* MAX14539EEVB+* PIN-PACKAGE 10 UTQFN 10 UTQFN 10 UTQFN 10 UTQFN 10 UTQFN TOP MARK AAS AAT AAU AAV AAW SHUNT RESISTORS NO1, NO2 Terminals NO1, NO2 Terminals NO_ and NC_ Terminals SHUTDOWN MODE (EN = LOW) SIGNAL RANGE -1.5V to min (VCC, 3V) -1.5V to min (VCC, 3V) 0 to VCC 0 to VCC -1.5V to min (VCC, 3V) Note: All devices are specified over the -40C to +85C temperature range. +Denotes a lead(Pb)-free package/RoHS-compliant package. *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. Low-Resistance DPDT Switches with Negative Rail MAX14535E-MAX14539E Detailed Description The MAX14535E-MAX14539E are low on-resistance and high ESD-protected single DPDT switches that operate from a +2.4V to +5.5V supply and are designed to multiplex AC-coupled analog signals. These switches combine the low on-capacitance (CON) and low on-resistance (RON) necessary for high-performance switching applications. The negative signal capability of the analog channel allows signals below ground to pass through without distortion. Digital Control Input The MAX14535E-MAX14539E provide a single-bit control logic input, CB. CB controls the switch position as shown in the Functional Diagrams. Drive CB rail-to-rail to minimize power consumption. Enable Input The MAX14535E-MAX14539E feature a shutdown mode that reduces the supply current (less than 1A for MAX14537E/MAX14538E) and places the switches in high impedance. Drive EN low to place the device in shutdown mode. Drive EN high for normal operation. Analog Signal Levels The MAX14535E-MAX14539E are bidirectional, allowing NO_, NC_, and COM_ to be configured as either inputs or outputs. Note that NC_ and NO_ are only protected against ESD up to 2kV (Human Body Model) and may require additional ESD protection if used as outputs. These devices feature a charge pump that generates a negative supply to allow analog signals as low as -1.5V to pass through NO_, NC_, or COM_. This allows AC-coupled signals that drop below ground to pass even when operating from a 3.0V to 5.5V supply. For the MAX14537E/MAX14538E, the negative charge pump is controlled by the enable input and is active when EN is high. When EN is driven low, the negative charge pump is disabled, which puts the devices in the lowest possible current consumption, and the signal range is 0 to VCC. The negative charge pump is always active for the MAX14535E/MAX14536E/MAX14539E, therefore, a negative signal (at most -1.5V) can be applied through NC_, NO_, or COM_, even when EN is driven low. A negative rail signal (signal voltage < 0) must not be applied to the switch unless the negative charge pump is active. Shunt Resistors (MAX14535E/MAX14537E/MAX14539E) When EN is high, the shunt resistors are controlled by CB. When CB is low, NC_ is connected to COM_ and NO_ is connected to shunt resistors. When CB is high, NO_ is connected to COM_ and NC_ is connected to shunt resistors (MAX14539E). When EN is low, all the switches are open and all the shunt resistors are active. Click-and-Pop Suppression The 500 shunt resistors on the MAX14535E/ MAX14537E/MAX14539E automatically discharge any capacitance at the NO_ terminals (or NC_ terminals, MAX14539E) when they are unconnected from COM_. This reduces audio click-and-pop sounds that may occur when switching between capacitively coupled audio sources. 2 _______________________________________________________________________________________ Low-Resistance DPDT Switches with Negative Rail Applications Information Extended ESD Protection ESD protection structures are incorporated on all pins to protect against electrostatic discharges up to 2kV (HBM) encountered during handling and assembly. COM1 and COM2 are further protected against ESD up to 15kV (HBM) without damage. The ESD structures withstand high ESD both in normal operation and when the device is powered down. After an ESD event, the MAX14535E-MAX14539E continue to function without latchup. Human Body Model Figure 3a shows the Human Body Model. Figure 3b shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest that is then discharged into the device through a 1.5k resistor. MAX14535E-MAX14539E IEC 61000-4-2 The main difference between tests done using the Human Body Model and IEC 61000-4-2 is higher peak current in the IEC 61000-4-2. Because series resistance is lower in the IEC 61000-4-2 ESD test model (Figure 3c) the ESD withstand voltage measured using the Human Body Model. Figure 3d shows the current waveform for the 8kV IEC 61000-4-2 Level 4 ESD Contact Discharge test. The Air-Gap Discharge test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized. ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. RC 1M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1.5k DISCHARGE RESISTANCE DEVICE UNDER TEST IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) Cs 100pF STORAGE CAPACITOR tDL CURRENT WAVEFORM Figure 3a. Human Body ESD Test Model Figure 3b. Human Body Current Waveform RC 50M to 100M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST I 100% 90% IPEAK 10% tR = 0.7ns to 1ns 30ns 60ns t Cs 150pF STORAGE CAPACITOR Figure 3c. IEC 61000-4-2 ESD Test Model Figure 3d. IEC 61000-4-2 ESD Generator Current Waveform _______________________________________________________________________________________ 3 Low-Resistance DPDT Switches with Negative Rail MAX14535E-MAX14539E Power-Supply Sequencing Caution: Do not exceed the absolute maximum ratings because stresses beyond the listed ratings may cause permanent damage to the device. Proper power-supply sequencing is recommended for all devices. Apply VCC before applying analog signals, especially if the analog signal is not current limited. Functional Diagrams MAX14535E/ MAX14537E NC1 COM1 NC2 COM2 NO1 NO2 EN GND CB 4 _______________________________________________________________________________________ Low-Resistance DPDT Switches with Negative Rail Functional Diagrams (continued) MAX14535E-MAX14539E MAX14536E/ MAX14538E NC1 COM1 NC2 COM2 NO1 NO2 EN GND CB MAX14539E NC1 COM1 NC2 COM2 NO1 NO2 EN GND CB _______________________________________________________________________________________ 5 Low-Resistance DPDT Switches with Negative Rail MAX14535E-MAX14539E Typical Operating Circuits 3.0V 0.1F VCC DirectDrive(R) AUDIO AMPLIFIER NC1 NC2 MAX14535E/ MAX14537E COM1 AUDIO CONNECTOR COM2 NO1 AUDIO AMPLIFIER NO2 EN GND CB DirectDrive is a registered trademark of Maxim Integrated Products, Inc. 6 _______________________________________________________________________________________ Low-Resistance DPDT Switches with Negative Rail Typical Operating Circuits (continued) 3.0V 0.1F MAX14535E-MAX14539E VCC DirectDrive AUDIO AMPLIFIER NC1 NC2 MAX14536E/ MAX14538E COM1 AUDIO CONNECTOR COM2 DirectDrive AUDIO AMPLIFIER NO1 NO2 EN GND CB Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 10 UTQFN PACKAGE CODE V101A1CN+1 DOCUMENT NO. 21-0028 _______________________________________________________________________________________ 7 Low-Resistance DPDT Switches with Negative Rail MAX14535E-MAX14539E Revision History REVISION NUMBER 0 1 REVISION DATE 2/09 4/09 Initial release Removed future product asterisk for MAX14536E and updated Electrical Characteristics table. DESCRIPTION PAGES CHANGED -- 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. |
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