LMS4684 0.5Ω Low-Voltage, Dual SPDT Analog Switch General Description Features The LMS4684 is a low on-resistance, low voltage dual SPDT (Single-Pole/Double-Throw) analog switch that operates from a 1.8V to 5.5V supply. The LMS4684 features a 0.5Ω RON for its NC switch and 0.8Ω RON for its NO switch at a 2.7V supply. The digital logic inputs are 1.8V logiccompatible with a 2.7V to 3.3V supply. n n n n n n n n The LMS4684 is available in the 12 bump micro SMD and the 10 lead LLP miniature packages. These PCB real estate saving packages offer extreme performance while saving money with small footprints. NC switch RON 0.5Ω max @ 2.7V NO switch RON 0.8Ω max @ 2.7V 50nA (max) supply current TA = 25˚C 1.8 to 5.5V single supply operation 12-Bump micro SMD package LLP-10 package, 3x4mm See AN-1112 for micro SMD package considerations See AN-1187 for LLP package considerations Applications n n n n n Power routing Battery-operated equipment Communications circuits Modems Cell phones Connection Diagrams 10-LLP Package 12-Bump micro SMD Package 20077502 20077501 Center Bumps B2 and C2 are Not Electrically Connected Top View (Bumped Side Down) DAP needs to be connected to pin 6 on the board Top View IN NO 0 Off NC On 1 On Off Switches shown for Logic "0" input © 2004 National Semiconductor Corporation DS200775 www.national.com LMS4684 0.5Ω Low-Voltage, Dual SPDT Analog Switch June 2004 LMS4684 Absolute Maximum Ratings (Note 1) Storage Temperature Range If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Junction Temperature (Note 3) V+, IN Nominal Supply Voltage −0.3V to (V+ + 0.3V) Continuous Current NO, NC, COM ± 400mA −40˚C to 85˚C Thermal Resistance θJA 2000V Machine Model 1.8V to 5.5V Temperature Range ESD Tolerance (Note 2) Human Body Model 150˚C Max Operating Ratings −0.3V to 6.0V COM, NO, NC −65˚C to 150˚C LLP-10 TBD micro SMD-12 TBD 200V Electrical Characteristics Unless otherwise specified, V+ = 2.7 to 3.3V, VIH = 1.4V, VIL = 0.5V. Typical values are measured at 3V, and TJ = 25˚C. Boldface limits apply at temperature extremes. Symbol Parameter Conditions Min Typ V Analog Signal Range RON (NC) NC-On-Resistance (Note 4) V+ =2.7, ICOM =100ma, VNC =0 to V+ 0.3 0.5 Ω RON (NO) NO-On-Resistance (Note 4) V+ =2.7, ICOM =100ma, VNO =0 to V+ 0.45 0.8 Ω ∆RON On-Resistance Match Between Channels (Note 4), (Note 5) V+ =2.7, ICOM =100ma, VNC or VNO =1.5V 0.06 Ω V+ =2.7V, ICOM =100mA, VNC =0 to V+ 0.15 RFLAT(NO) NO-On Resistance Flatness (Note 6) INO(OFF) or INC(OFF) NO or NC Off-Leakage Current ICOM (ON) COM On-Leakage Current V Units + VNO, VNC, VCOM RFLAT(NC) NC-On-Resistance Flatness (Note 6) 0 Max LLP TJ =0˚C to 85˚C micro SMD TJ =0˚C to 85˚C 0.17 LLP TJ = −40˚C to +85˚C 0.18 micro SMD TJ = −40˚C to +85˚C 0.20 V+ =2.7V, ICOM =100mA, VNO = 0 to V+ V+ =3.3V, VNO or VNC =3V, 0.3V; VCOM =0.3V, 3V V+ =3.3V, VNO or VNC =3V, 0.3V, or floating; VCOM =3V, or floating 0.35 −1 1 −10 10 −2 2 −20 20 Ω Ω nA nA Dynamic Characteristics tON tOFF Turn-On Time Turn-Off Time V+ =2.7V, VNO or VNC =1.5V; RL =50Ω; CL =35pF; 35 V+ =2.7V, VNO or VNC =1.5V; RL = 50Ω; CL =35pF; 25 tBBM Break-Before-Make-Delay V+ =2.7V, VNO or VNC =1.5V; RL =50Ω; CL =35pF; Q Charge Injection COM =0; RS =0; CL = 1nF; 55 65 30 40 2 ns ns 15 ns 200 pC Digital I/O VIH Input Logic High VIL Input Logic Low IIN IN Input Leakage Current www.national.com 1.4 VIN =0 or V+ 2 −1 V 0.5 V 1 µA LMS4684 Electrical Characteristics (Continued) Unless otherwise specified, V+ = 2.7 to 3.3V, VIH = 1.4V, VIL = 0.5V. Typical values are measured at 3V, and TJ = 25˚C. Boldface limits apply at temperature extremes. Symbol Parameter Conditions Min Typ Max Units 5.5 V Power Supply V+ Power-Supply Range 1.8 I+ Supply Current (Note 4) −50 −200 0.04 50 200 nA Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. Note 2: Human body model: 1.5kΩ in series with 100pF. Machine model, 0Ω in series with 200pF. Note 3: The maximum power dissipation is a function of TJ(max) θJA and TA. Note 4: Guaranteed by design. Note 5: ∆RON is equal to the difference between NC1/NC2 RON or NO1/NO2 RON at a specified voltage. Note 6: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges. Symbolic Diagram 20077503 Ordering Information Package Part Number 12-Bump micro SMD LMS4684ITL Package Marking F09A LMS4684ITLX 10-Pin LLP LMS4684LD NSC Drawing TLA12DPA 3k Units Tape and Reel 1k Units Tape and Reel L4684 LMS4684LDX Transport Media 250 Units Tape and Reel LDA10B 4.5k Units Tape and Reel Pin Descriptions Name Pin ID LLP Description micro SMD NC 5, 7 D3, D1 Analog switch normally closed terminal IN 4, 8 C3, C1 Digital control input COM 3, 9 B3, B1 Analog switch common terminal NO 2, 10 A3, A1 Analog switch normally open terminal V+ 1 A2 Positive supply voltage GND 6, GND D2 Ground B2, C2 Not electrically connected. Can be used to help dissipate heat by connecting to GND pin. 3 www.national.com LMS4684 Typical Performance Characteristics Supply Current vs. Supply Voltage NO ON Resistance vs. COM Voltage 20077504 20077505 NC ON Resistance vs. COM Voltage Logic Threshold Voltage vs. Supply Voltage 20077506 20077507 Turn-on / Turn-off Times vs. Temperature Charge Injection vs. COM Voltage 20077508 www.national.com 20077509 4 LMS4684 Typical Performance Characteristics (Continued) NC On-Resistance vs. COM Voltage NC On-Resistance vs. COM Voltage 20077516 20077515 NO On-Resistance vs. COM Voltage NO On-Resistance vs. COM Voltage 20077517 20077518 5 www.national.com LMS4684 Application Notes PRODUCT DESCRIPTION The LMS4684 is a low voltage dual analog switch with extremely low On-Resistance operating with a supply voltage range of 1.8V to 5.5V. National has fully characterized the LMS4684 to operate in applications with 3V nominal supply voltage. The LMS4684 also features fast switching times for Turn-Off (40ns max over temp) and Turn-On (65ns max over temp). The switch operates asymmetrically, one terminal is normally closed (NC) and the other terminal normally open (NO). Both NC and NO terminals are connected to a common terminal (COM). This configuration is ideal for applications with asymmetric loads such as speaker handsets and internal speakers. ANALOG SIGNAL LEVELS 20077519 The Analog signal ranges from GND to V+ and are passed through the switch with very little change. Each switch is bidirectional so any pin can be an input or output. FIGURE 1. Overvoltage Protection Circuitry DIGITAL CONTROL INPUTS The IN pin can be driven to 5.5V regardless of the voltage level of the supply pin V+. For example if you wanted to have a supply of 2V you could still drive the IN digital control input to 5V. Minimum power is lost when the IN pin, is driven rail-to-rail. PCB LAYOUT Both the LLP and micro SMD packages offer enhanced board real estate savings because of their tiny footprints. These tiny packages are capable of supporting up to an absolute maximum of 400mA of continuous current because of the advanced thermal handling capabilities. SUPPLY VOLTAGE SEQUENCING It is good general practice to first apply the supply voltage to a CMOS device before any other supply on other pins.This is also true for the LMS4684 analog switch which is a CMOS device. However if it is necessary to have an analog signal applied before the supply voltage is applied and the analog signal supply is not limited to 20mA max, a diode connected between the supply voltage and the V+ pin as shown in the figure below will supply adequate input protection. This will limit the max analog voltage to a diode drop below V+. This diode D1 will also provide protection against some overvoltage situations. The LLP package has the exposed die attach pad internally connected to the internal circuit GND. When this pad is soldered to copper on the PCB board according to Application Note AN-1187 the full thermal capability of the LLP package can be achieved without additional bulky heat sinks to dissipate the heat generated. The micro SMD package has a similar capability to help dissipate heat generated through Bumps B2 and C2 which are not electrically connected. To enhance heat dissipation of the micro SMD package B2 and C2 could be connected to the GND pin and through copper traces on the board. Please see Application Note AN-1112 for micro SMD package considerations. www.national.com 6 LMS4684 Parameter Measuring Information 20077510 FIGURE 2. tON / tOFF Time 20077511 FIGURE 3. Break-Before Make Delay 20077513 FIGURE 4. Charge Injection 7 www.national.com LMS4684 Parameter Measuring Information (Continued) 20077514 FIGURE 5. Channel Capacitance www.national.com 8 LMS4684 Physical Dimensions inches (millimeters) unless otherwise noted 10-Lead LLP NS Package Number LDA10B X1 = 1590 ± 30 µm; X2 = 2327 ± 30 µm; X3 = 600 ± 75 µm 12-Bump micro SMD NS Package Number TLA12DPA 9 www.national.com LMS4684 0.5Ω Low-Voltage, Dual SPDT Analog Switch Notes LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. National Semiconductor Americas Customer Support Center Email: [email protected] Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: [email protected] National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: [email protected] Tel: 81-3-5639-7560 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.