MIC94305 500mA Switch with Ripple Blocker™ Technology General Description Features The MIC94305 is an integrated load switch that incorporates Micrel’s Ripple Blocker active filter technology. The MIC94305 provides high-frequency ripple attenuation (switching noise rejection) for applications where switching noise cannot be tolerated by sensitive downstream circuits, such as RF applications. A lowvoltage logic enable pin disconnects the pass element and puts the MIC94305 in a low current-shutdown state when disabled. The MIC94305 operates from an input voltage of 1.8V to 3.6V, allowing true load switching of low-voltage power rails in any electronic device. The output voltage (VOUT) is set at a fixed drop (typically 170mV) from the input voltage (VOUT = VIN – 170mV). This maintains high efficiency independent of given load conditions and currents. The MIC94305 is packaged in a 6-ball 0.84mm x 1.32mm CSP package, or 6-pin 1.6mm x 1.6mm Thin DFN package, and has a junction operating temperature range of −40°C to +125°C. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • 1.8V to 3.6V input voltage range • Active noise rejection over a wide frequency band − >60dB from 40kHz to 5MHz • Rated to 500mA output current • Current-limit and thermal-limit protected • Ultra-small 0.84mm x 1.32mm, 6-ball CSP • 1.6mm x 1.6mm, 6-pin Thin DFN • Logic-controlled enable pin • −40°C to +125°C junction temperature range Applications • Smart phones • Tablet PC/notebooks and webcams • Digital still and video cameras • Videoconferencing • Bar-code scanners • Global positioning systems • Automotive and industrial applications _________________________________________________________________________________________________ Typical Application PSRR COUT = 4.7µF 0 -10 PSRR (dB) -20 500mA -30 -40 300mA -50 -60 -70 -80 VIN = 2.5V + 40mVpp 10 10 100 100 10mA 1K 10,000 10K 100,00 100K 1,000,0 1M 10,000, 10M 1,000 0 00 000 FREQUENCY (Hz) Ripple Blocker is a trademark of Micrel, 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 September 2012 M9999-091312-A Micrel, Inc. MIC94305 Ordering Information Part Number Marking Code Package Lead Finish MIC94305YCS* W1 0.84mm × 1.32mm WLCSP Pb-Free 1 2W 1.6mm × 1.6mm Thin DFN Pb-Free MIC94305YMT Notes: 1. Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. ∗ Contact Micrel Marketing for availability. Pin Configuration 6-Ball 0.84mm × 1.32mm CSP (CS) Ball View 6-Pin 1.6mm × 1.6mm Thin DFN (MT) Top View Note: 1. Thin DFN ▲ = Pin 1 identifier. Pin Description Pin Number (Thin DFN) Ball Number (CSP) Pin Name 1, 2 A2, B2 VOUT Power switch output. 3 C2 GND Ground. 4 C1 EN Enable input. A logic HIGH signal on this pin enables the part. Logic LOW disables the output. Do not leave floating. 5, 6 A1, B1 VIN Power switch input and chip supply. EP − ePad September 2012 Pin Name Exposed heatsink pad. Connect to Ground for best thermal performance. 2 M9999-091312-A Micrel, Inc. MIC94305 Functional Block Diagram MIC94305 Block Diagram September 2012 3 M9999-091312-A Micrel, Inc. MIC94305 Absolute Maximum Ratings(1) Operating Ratings(2) Input Voltage (VIN) ........................................... −0.3V to +4V Output Voltage (VOUT). .................................... −0.3V to +4V Enable Voltage (VEN)..................−0.3V to VIN + 0.3V or +4V Lead Temperature (soldering, 10s)............................ 260°C Storage Temperature (TS)......................... −65°C to +150°C ESD Rating(3) .................................................................. 3kV Input Voltage (VIN)........................................ +1.8V to +3.6V Enable Voltage (VEN).............................................. 0V to VIN Junction Temperature (TJ) ........................ –40°C to +125°C Junction Thermal Resistance 0.84mm x 1.32mm WLCSP (θJA) .....................160°C/W 1.6mm x 1.6mm Thin DFN (θJA) ........................92°C/W Electrical Characteristics(4) VIN = VEN = 3.6V; IOUT = 1mA; COUT = 4.7µF; TA = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Parameter Condition Min. Typ. 1.8 Input Voltage VIN − VOUT, −40°C ≤ TJ ≤ +85°C 170 f = 20kHz, IOUT = 500mA 45 f = 100kHz to 5MHz, IOUT = 500mA 55 Total Output Noise f = 10Hz to 100kHz 98 Current Limit VOUT = 0V Turn-On Time Voltage Drop VIN Ripple Rejection (PSRR) 530 Max. Units 3.6 V 250 mV dB µVRMS 725 1100 mA EN controlled 90 150 µs Load Regulation 100µA to 100mA 10 Ground Current IOUT = 100µA 150 200 µA Shutdown Current VEN = 0V 0.2 5 µA 0.4 V mV Enable Input Logic LOW 1.0 Input Logic HIGH Input Current V 0.01 1 µA Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF. 4. Specification for packaged product only. September 2012 4 M9999-091312-A Micrel, Inc. MIC94305 Typical Characteristics PSRR COUT = 4.7µF 0 0 -10 -10 -10 -20 300mA -50 -30 -40 -60 -60 -70 -70 VIN = 1.8V + 40mVpp 1K 10,000 10K 100,00 100K1,000,0 1M 10,000, 10M 100100 1, 000 0 00 000 10 10 100 100 300mA -50 PSRR COUT = 10µF PSRR COUT = 10µF 0 -10 -20 -20 -60 -20 500mA -30 -40 300mA -50 PSRR (dB) 300mA PSRR (dB) 0 -10 -50 -60 -70 VIN = 1.8V + 40mVpp 10 10 VIN = 2.5V + 40mVpp -40 10 10 100 100 10 10 1k 10,000 10k 100,00 100k1,000,0 1M 10,000, 10M 1,000 0 00 000 100 100 10mA 1k 10,000 10k 100,00 100k1,000,0 1M 10,000, 10M 1,000 0 00 000 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) PSRR COUT = 22µF PSRR COUT = 22µF PSRR COUT = 22µF 0 0 -10 -10 -10 -20 -20 -20 500mA -40 300mA -50 -60 VIN = 1.8V + 40mVpp 10mA -80 100 100 1K 1,000 10K 100,00 100K1,000,0 1M 10,000, 10M 10,000 0 00 000 FREQUENCY (Hz) September 2012 PSRR (dB) -30 -40 300mA -50 -60 -40 300mA -50 -60 -70 -70 10mA VIN = 2.5V + 40mVpp -80 10 10 500mA -30 PSRR (dB) -30 10 10 VIN = 3.6V + 40mVpp -80 0 -70 300mA -50 -70 10mA -80 100 1,000 1k 10,000 10k 100,00 100k1,000,0 1M 10,000, 10M 100 0 00 000 500mA -30 -60 -70 10mA -80 10mA 1K 10,000 10K 100,00 100K 1,000,0 1M 10,000, 10M 1,000 0 00 000 FREQUENCY (Hz) 0 -40 100 100 FREQUENCY (Hz) -10 500mA VIN = 3.6V + 40mVpp -80 10 10 1K 10,000 10K 100,00 100K 1,000,0 1M 10,000, 10M 1,000 0 00 000 PSRR COUT = 10µF PSRR (dB) -40 -70 10mA VIN = 2.5V + 40mVpp FREQUENCY (Hz) -30 500mA -30 -60 10mA -80 1010 300mA -50 PSRR (dB) -40 PSRR (dB) -30 -20 500mA 500mA -80 PSRR (dB) PSRR COUT = 4.7µF 0 -20 PSRR (dB) PSRR COUT = 4.7µF 100 100 1K 1,000 10K 100,00 100K 1,000,0 1M 10,000, 10M 10,000 0 00 000 FREQUENCY (Hz) 5 -80 VIN = 3.6V + 40mVpp 10 10 100 100 1K 1,000 10mA 10K 100,00 100K1,000,0 1M 10,000, 10M 10,000 0 00 000 FREQUENCY (Hz) M9999-091312-A Micrel, Inc. MIC94305 Typical Characteristics (Continued) Output Voltage vs. Output Current Output Voltage vs. Output Current 3.6 1.8 1.7 1.65 1.6 1.55 1.5 VIN = 1.8V 1.45 220 3.55 VOLTAGE DROP (mV) OUTPUT VOLTAGE (V) 3.5 3.45 3.4 3.35 CIN = COUT = 4.7µF 1.4 50 100 150 200 250 300 350 400 450 500 160 140 120 100 80 60 40 CIN = COUT = 4.7µF 20 VIN = 2V 0 0 OUTPUT CURRENT (mA) 180 CIN = COUT = 4.7µF 3.3 0 200 V IN = 3.6V 0 50 100 150 200 250 300 350 400 450 500 50 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA) Voltage Drop vs. Input Voltage OUTPUT CURRENT (mA) Ground Current vs. Input Voltage Ground Current vs. Output Current 250 180 160 240 GROUND CURRENT (µA) CIN = COUT = 4.7µF 230 400mA 220 500mA 210 200 300mA 190 180 170 100mA 140 120 100 80 60 40 V IN = 2.8V 20 0 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 INPUT VOLTAGE (V) 160 500mA 300mA 150 140 100mA 130 10mA 120 0 3.6 CIN = COUT = 4.7µF 170 CIN = COUT = 4.7µF 50mA 160 GROUND CURRENT (µA) OUTPUT VOLTAGE (V) 260 240 1.75 VOLTAGE DROP (mV) Voltage Drop vs. Output Current 50 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA) 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 INPUT VOLTAGE (V) MIC94305YMT Output Noise Spectral Density 100 NOISE µV/√Hz 10 1 0.1 0.01 VIN = VEN1 = 3V COUT = 4.7µF 0.001 1010 100 1,000 1K 10,000 10K 100,00 100K1,000,0 1M 10,000, 10M 100 0 00 000 FREQUENCY (Hz) September 2012 1 6 M9999-091312-A Micrel, Inc. MIC94305 Functional Characteristics September 2012 7 M9999-091312-A Micrel, Inc. MIC94305 Application Information Enable/Shutdown The MIC94305 comes with an active-high enable pin that allows the Ripple Blocker to be disabled. Forcing the enable pin low disables the MIC94305 and sends it into a “zero” off mode current state. In this state, current consumed by the MIC94305 goes to nearly zero. Forcing the enable pin high enables the output voltage. The active-high enable pin uses CMOS technology and cannot be left floating; a floating enable pin may cause an indeterminate state on the output. The MIC94305 uses Ripple Blocker technology to integrate a load switch with a high-performance active filter. The MIC94305 includes a low-voltage logic enable pin, and is fully protected from damage caused by fault conditions, offering linear current limiting and thermal shutdown. Input Capacitor The MIC94305 is a high-performance, high-bandwidth device. An input capacitor of 4.7µF from the input to ground is required to provide stability. Low-ESR ceramic capacitors provide optimal performance using a minimum of space. Additional high-frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RF-based circuit. X5R or X7R dielectrics are recommended for the input capacitor. Y5V dielectrics lose most of their capacitance over temperature and are not recommended. Thermal Considerations The MIC94305 is designed to provide 500mA of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part, which is fixed at 170mV typical, 250mV worst case. For example, if the input voltage is 2.75V, the output voltage is 2.5V, and the output current is 500mA. The actual power dissipation of the Ripple Blocker™ can be determined using the equation: Output Capacitor The MIC94305 requires an output capacitor of 4.7µF or greater to maintain stability. For optimal ripple rejection performance, a 4.7µF capacitor is recommended. The design is optimized for use with low-ESR ceramic-chip capacitors. High-ESR capacitors are not recommended because they may cause high-frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 4.7µF ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are because of their temperature recommended performance. X7R-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60%, respectively, over their operating temperature ranges. If you use a ceramic-chip capacitor with a Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. PD = (VIN − VOUT) IOUT + VIN IGND Because this device is CMOS and the ground current is typically <100µA over the load range, the power dissipation contributed by the ground current is <1% and can be ignored for this calculation: PD = (2.75V − 2.5V) × 500mA PD = 0.125W To determine the package’s maximum ambient operating temperature, use the junction-to-ambient thermal resistance of the device and the following basic equation: ⎛ TJ(MAX) − TA PD(MAX) = ⎜⎜ θ JA ⎝ TJ(MAX) = 125°C, the maximum junction temperature of the die; θJA thermal resistance = 160°C/W for the YCS package, and 92°C/W for the YMT package. No Load Stability The MIC94305 will remain stable with no load. This is especially important in CMOS RAM keep-alive applications. September 2012 ⎞ ⎟ ⎟ ⎠ 8 M9999-091312-A Micrel, Inc. MIC94305 Substituting PD for PD(MAX) and solving for the ambient operating temperature gives the maximum operating conditions for the regulator circuit. For proper operation, do not exceed the maximum power dissipation. For example, when operating the MIC94305YMT at a 2.75V input voltage and 500mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.125W = (125°C − TA)/(92 °C/W) TA = 113.5°C It follows from this equation that the maximum ambient operating temperature of 113.5°C is allowed in a 1.6mm x 1.6mm DFN package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the “Regulator Thermals” section of Micrel’s Designing with Low-Dropout Voltage Regulators handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf For more information about Micrel’s Ripple Blocker products, go to: http://www.micrel.com/rippleblocker/ http://www.micrel.com/page.do?page=/productinfo/products/mic94300.jsp http://www.micrel.com/page.do?page=/productinfo/products/mic94310.jsp September 2012 9 M9999-091312-A Micrel, Inc. MIC94305 Typical Application Schematic Bill of Materials Item Part Number CIN, COUT C1005X5R1A475K U1 MIC94305YCS Manufacturer (1) TDK Micrel, Inc.(2) Description Qty. Capacitor, 4.7µF Ceramic, 10V, X7R, Size 0603 2 500mA Switch with Ripple Blocker Technology 1 Notes: 1. TDK: www.tdk.com. 2. Micrel, Inc.: www.micrel.com. September 2012 10 M9999-091312-A Micrel, Inc. MIC94305 Package Information(1) 6-Ball 0.84mm × 1.32mm WL-CSP (CS) Note: 1. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com. September 2012 11 M9999-091312-A Micrel, Inc. MIC94305 Package Information(1) (Continued) 6-Pin 1.6mm × 1.6mm Thin DFN (MT) September 2012 12 M9999-091312-A Micrel, Inc. MIC94305 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. © 2012 Micrel, Incorporated. September 2012 13 M9999-091312-A