MIC94080/1/2/3/4/5 67mΩ RDSON 2A High Side Load Switch in 0.85mm x 0.85mm Thin MLF® Package General Description Features The MIC94080/1/2/3/4/5 is a family of high-side load switches designed to operate from 1.7V to 5.5V input voltage. The load switch pass element is an internal 67mΩ RDSON P-Channel MOSFET which enables the device to support up to 2A of continuous current. Additionally, the load switch supports 1.5V logic level control and shutdown features in a tiny 0.85mm x 0.85mm 4-pin Thin MLF® package. The MIC94080 and MIC94081 feature rapid turn on. The MIC94082 and MIC94083 provide a slew rate controlled softstart turn-on of 800µs, while the MIC94084 and MIC94085 provide a slew rate controlled soft-start turn-on of 120µs. The soft-start feature is provided to prevent an in-rush current event from pulling down the input supply voltage. The MIC94081, MIC94083, and MIC94085 feature an active load discharge circuit which switches in a 250Ω load when the switch is disabled to automatically discharge a capacitive load. An active pull-down on the enable input keeps the MIC94080/1/2/3/4/5 in a default OFF state until the enable pin is pulled above 1.25V. Internal level shift circuitry allows low voltage logic signals to switch higher supply voltages. The enable voltage can be as high as 5.5V and is not limited by the input voltage. The MIC94080/1/2/3/4/5 operating voltage range makes them ideal for Lithium ion and NiMH/NiCad/Alkaline battery powered systems, as well as non-battery powered applications. The devices provide low quiescent current and low shutdown current to maximize battery life. Datasheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • 0.85mm x 0.85mm space saving 4-pin Thin MLF® package • 1.7V to 5.5V input voltage range • 2A continuous operating current • 67mΩ RDSON • Internal level shift for CMOS/TTL control logic • Ultra low quiescent current • Micro-power shutdown current • Soft-Start: MIC94082/3 (800µs), MIC94084/5 (120µs) • Load discharge circuit: MIC94081, MIC94083, MIC94085 • Ultra fast turn off time • Junction operating temperature from -40ºC to +125ºC Applications • • • • • • • • • Cellular phones Portable Navigation Devices (PND) Personal Media Players (PMP) Ultra Mobile PCs Portable instrumentation Other Portable applications PDAs GPS Modules Industrial and DataComm equipment ____________________________________________________________________________________________________________________ Typical Application VIN EN VOUT Level Shift and Slew Rate Control VIN Load GND MIC94080 (ultra fast turn on) MIC94082 (800µs soft-start) MIC94084 (120µs soft-start) EN VOUT Level Shift Slew Rate Control & Load Discharge Load GND MIC94081 (ultra fast turn on with auto-discharge) MIC94083 (800µs soft-start with auto-discharge) MIC94085 (120µs soft-start with auto-discharge) MLF and MicroLeadFrame is a registered trademark of Amkor Technology, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com January 2011 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 Ordering Information Fast Turn On Part Number Part Marking Soft-Start MIC94080YFT C1 MIC94081YFT C2 MIC94082YFT C5 800µs MIC94083YFT C7 800µs MIC94084YFT C0 120µs MIC94085YFT 1C 120µs Load Discharge • • Package(1) 4-Pin 0.85mm x 0.85mm Thin MLF® • 4-Pin 0.85mm x 0.85mm Thin MLF® 4-Pin 0.85mm x 0.85mm Thin MLF® • 4-Pin 0.85mm x 0.85mm Thin MLF® 4-Pin 0.85mm x 0.85mm Thin MLF® • 4-Pin 0.85mm x 0.85mm Thin MLF® Notes: ® 1. Thin MLF is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration 4-Pin (0.85mm x 0.85mm) Thin MLF® (Top View) (Bottom View) Example Showing Orientation of Part Marking Pin Description Pin Number Pin Name 1 VOUT Drain of P-Channel MOSFET. 2 GND Ground should be connected to electrical ground. 3 VIN Source of P-Channel MOSFET. EN Enable (Input): Active-high CMOS/TTL control input for switch. Internal ~2MΩ Pull down resistor. Output will be off if this pin is left floating. 4 January 2011 Pin Function 2 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 Absolute Maximum Ratings(1) Operating Ratings(2) Input Voltage (VIN) ........................................................ +6V Enable Voltage (VEN) ................................................... +6V Continuous Drain Current (ID) (3) TA = 25°C .............................................................. ±2A TA = 85°C ........................................................... ±1.5A Pulsed Drain Current (IDP)(4) ...................................... ±6.0A Continuous Diode Current (IS)(5) .............................. –50mA Storage Temperature (Ts) ....................... –55°C to +150°C ESD Rating – HBM(6).................................................... 3kV Input Voltage (VIN)....................................... +1.7 to +5.5V Junction Temperature (TJ) .....................–40°C to +125°C Package Thermal Resistance 0.85mm x 0.85mm Thin MLF® (θJA) .......................................................140°C/W (θJC) .........................................................85°C/W Electrical Characteristics TA = 25°C, bold values indicate –40°C< TA < +85°C, unless noted. Symbol Parameter Condition Min VEN_TH Enable Threshold Voltage VIN = 1.7V to 4.5V, ID = –250µA 0.4 IQ Quiescent Current VIN = VEN = 5.5V, ID = OPEN Measured on VIN MIC94080/1 VIN = VEN = 5.5V, ID = OPEN Measured on VIN MIC94082/3/4/5 Typ Max Units 1.25 V 0.1 1 µA 8 15 IEN Enable Input Current VIN = VEN = 5.5V, ID = OPEN 2.8 4 µA ISHUT-Q Quiescent Current (shutdown) VIN = +5.5V, VEN = 0V, ID = OPEN (7) Measured on VIN 0.02 1 µA ISHUT-SWITCH OFF State Leakage Current VIN = +5.5V, VEN = 0V, ID = SHORT (7) Measured on VOUT, 0.02 1 µA RDS(ON) P-Channel Drain to Source ON Resistance VIN = +5.0V, ID = –100mA, VEN = 1.5V 67 115 mΩ VIN = +4.5V, ID = –100mA, VEN = 1.5V 70 130 mΩ VIN = +3.6V, ID = –100mA, VEN = 1.5V 80 165 mΩ VIN = +2.5V, ID = –100mA, VEN = 1.5V 110 225 mΩ VIN = +1.8V, ID = –100mA, VEN = 1.5V 175 350 mΩ VIN = +1.7V, ID = –100mA, VEN = 1.5V 200 375 mΩ VIN = +3.6V, ITEST = 1mA, VEN = 0V 250 400 Ω RSHUTDOWN Turn-Off Resistance MIC94081/3/5 Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. With thermal contact to PCB. See thermal considerations section. 4. Pulse width <300µs with < 2% duty cycle. 5. Continuous body diode current conduction (reverse conduction, i.e. VOUT to VIN) is not recommended. 6. Devices are ESD sensitive. Handling precautions recommended. HBM (Human body model), 1.5kΩ in series with 100pF. 7. Measured on the MIC94080YFT. January 2011 3 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 Electrical Characteristics (Dynamic) TA = 25°C, bold values indicate –40°C< TA < +85°C, unless noted. Symbol Parameter Condition tON_DLY Turn-On Delay Time VIN = +3.6V, ID = –100mA, VEN = 1.5V MIC94080, MIC94081 tON_RISE Turn-On Rise Time Min Typ Max Units 0.40 1.5 µs VIN = +3.6V, ID = –100mA, VEN = 1.5V MIC94082, MIC94083 200 600 1500 µs VIN = +3.6V, ID = –100mA, VEN = 1.5V MIC94084, MIC94085 65 110 165 µs 0.4 1.5 µs VIN = +3.6V, ID = –100mA, VEN = 1.5V MIC94080, MIC94081 VIN = +3.6V, ID = –100mA, VEN = 1.5V MIC94082, MIC94083 400 800 1500 µs VIN = +3.6V, ID = –100mA, VEN = 1.5V MIC94084, MIC94085 65 120 175 µs tOFF_DLY Turn-Off Delay Time VIN = +3.6V, ID = –100mA, VEN = 0V 60 200 ns tOFF_FALL Turn-Off Fall Time VIN = +3.6V, ID = –100mA, VEN = 0V 20 100 ns January 2011 4 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 Typical Characteristics MIC94080/1/2/3/4/5 MIC94080/1 MIC94082/3/4/5 January 2011 MIC94080/1/2/3/4/5 MIC94082/83/84/85 MIC94081/2/3/4/5 5 MIC94080/1/2/3/4/5 MIC94080/81 MIC94080/1 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 Typical Characteristics MIC94082/3 MIC94080/1 MIC94082/3 MIC94084/5 MIC94084/5 MIC94080/1/2/3/4/5 MIC94080/1/2/3/4/5 January 2011 6 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 Functional Characteristics MIC94080 January 2011 7 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 MIC94081 January 2011 8 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 MIC94082 January 2011 9 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 MIC94083 January 2011 10 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 MIC94084 January 2011 11 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 MIC94085 January 2011 12 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 Application Information Power Switch SOA The safe operating area (SOA) curve represents the boundary of maximum safe operating current and maximum safe operating junction temperature. Figure 3. Simple Thermal Circuit Now replacing the variables in the equation for Vx, we can find the junction temperature (TJ) from power dissipation, ambient temperature and the known thermal resistance of the PCB (RθCA) and the package (RθJC). TJ = PDISS x (RθJC + RθCA) + TA PDISS is calculated as ISWITCH2 x RSWmax. RθJC is found in the operating ratings section of the datasheet and RθCA (the PCB thermal resistance) values for various PCB copper areas is discussed in the document “Designing with Low Dropout Voltage Regulators” available from the Micrel website (LDO Application Hints). Figure 1. SOA Graph The curves above show the SOA for various VIN’s mounted on a typical 1 layer, 1 square inch copper board. Example: A switch is intended to drive a 1A load and is placed on a printed circuit board which has a ground plane area of at least 25mm by 25mm (625mm2). The Voltage source is a Li-ion battery with a lower operating threshold of 3V and the ambient temperature of the assembly can be up to 50ºC. Summary of variables: ISW = 1A VIN = 3V to 4.2V TA = 50oC Power Dissipation Considerations As with all power switches, the current rating of the switch is limited mostly by the thermal properties of the package and the PCB it is mounted on. There is a simple ohms law type relationship between thermal resistance, power dissipation and temperature, which are analogous to an electrical circuit: RθJC = 85ºC/W RθCA = 53ºC/W Read from Graph in Figure 4 Figure 2. Simple Electrical Circuit From this simple circuit we can calculate Vx if we know Isource, Vz and the resistor values, Rxy and Ryz using the equation: Vx = Isource ⋅ (Rxy + Ryz) + Vz Thermal circuits can be considered using these same rules and can be drawn similarly by replacing current sources with power dissipation (in Watts), resistance with thermal resistance (in ºC/W) and voltage sources with temperature (in ºC). January 2011 Figure 4. Excerpt from the LDO Book 13 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 PDISS = ISW2 x RSWmax The worst case switch resistance (RSWmax) at the lowest VIN of 3V is not available in the datasheet, so the next lower value of VIN is used. resistance in this case can be 30% higher (See RDSON variance vs. temperature graph). However, 200mΩ is the maximum over temperature. Therefore: TJ = 12 x 0.2 x (85+53) + 50 TJ = 78ºC This is below the maximum 125ºC. RSWmax @ 2.5v = 200mΩ If this were a figure for worst case RSWmax for 25ºC, an additional consideration is to allow for the maximum junction temperature of 125ºC, the actual worst case January 2011 14 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 Package Information 4-Pin (0.85mm x 0.85mm) Thin MLF® (FT) January 2011 15 M9999-013111-D Micrel, Inc. MIC94080/1/2/3/4/5 Recommended Land Pattern 4-Pin (0.85mm x 0.85mm) Thin MLF® (FT) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2008 Micrel, Incorporated. January 2011 16 M9999-013111-D