MIC94310 200mA LDO with Ripple Blocker™ Technology General Description Features The MIC94310 Ripple Blocker™ is a monolithic integrated circuit that provides low-frequency ripple attenuation (switching noise rejection) to a regulated output voltage. This is important for applications where a DC/DC switching converter is required to lower or raise a battery voltage but where switching noise cannot be tolerated by sensitive downstream circuits such as in RF applications. The MIC94310 maintains high power supply ripple rejection (PSRR) with input voltages operating near the output voltage level to improve overall system efficiency. A lowvoltage logic enable pin facilitates ON/OFF control at typical GPIO voltage levels. The MIC94310 operates from an input voltage of 1.8V to 3.6V. Packaged in a 0.88mm x 0.88mm 4-ball CSP or a 4-pin ® 1.2mm x 1.6mm Thin MLF , the MIC94310 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 − >50dB from 10Hz to 10MHz at 200mA load • Rated to 200mA output current • Fixed output voltages • Current-limit and thermal-limit protected • Ultra-small 0.88mm x 0.88mm 4-ball CSP • 1.2mm x 1.6mm, 4-pin Thin MLF® • 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 • Global positioning systems • Mobile computing • Automotive and industrial applications _________________________________________________________________________________________________ Typical Application PSRR COUT = 1µF 0 PSRR (dB) -20 -40 -60 IOUT = 200mA IOUT = 100mA -80 -100 VIN = 2.5V + 40mVpp IOUT = 10mA VOUT = 1.8V -120 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M 1.E+01 FREQUENCY (Hz) Ripple Blocker is a trademark of Micrel, Inc MLF and MicroLeadFrame are registered trademarks 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 February 2012 M9999-020612-A Micrel, Inc. MIC94310 Ordering Information Part Number Marking Code Output Voltage Package2,3 Lead Finish 1Z 1.2V 0.88mm x 0.88mm CSP Pb-Free MIC94310-4YCS MIC94310-FYCS 2Z 1.5V 0.88mm x 0.88mm CSP Pb-Free MIC94310-GYCS1 Z9 1.8V 0.88mm x 0.88mm CSP Pb-Free 1 Z8 1.85V 0.88mm x 0.88mm CSP Pb-Free Z7 2.5V 0.88mm x 0.88mm CSP Pb-Free MIC94310-DYCS MIC94310-JYCS 1 1 Z6 2.8V 0.88mm x 0.88mm CSP Pb-Free MIC94310-NYCS1 Z5 2.85V 0.88mm x 0.88mm CSP Pb-Free MIC94310-PYCS Z4 3.0V 0.88mm x 0.88mm CSP Pb-Free MIC94310-SYCS Z3 3.3V 0.88mm x 0.88mm CSP Pb-Free MIC94310-4YMT 31T 1.2V 1.2mm x 1.6mm Thin MLF® Pb-Free 1.5V 1.2mm x 1.6mm Thin MLF ® Pb-Free 1.2mm x 1.6mm Thin MLF ® Pb-Free ® Pb-Free MIC94310-MYCS 32T MIC94310-FYMT 31G MIC94310-GYMT MIC94310-DYMT 1 MIC94310-JYMT1 MIC94310-MYMT MIC94310-NYMT 1 1 MIC94310-PYMT MIC94310-SYMT 1.8V 31D 1.85V 1.2mm x 1.6mm Thin MLF 31J 2.5V 1.2mm x 1.6mm Thin MLF® Pb-Free 2.8V 1.2mm x 1.6mm Thin MLF ® Pb-Free ® Pb-Free 31M 31N 2.85V 1.2mm x 1.6mm Thin MLF 31P 3.0V 1.2mm x 1.6mm Thin MLF® Pb-Free 3.3V ® Pb-Free 31S 1.2mm x 1.6mm Thin MLF Notes: 1. Contact Micrel Marketing for availability. 2. Thin MLF ▲ = Pin 1 identifier. 3. Thin MLF is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. ® ® February 2012 2 M9999-020612-A Micrel, Inc. MIC94310 Pin Configuration 4-Pin 1.2mm × 1.6mm Thin MLF® (MT) Top View 4-Ball 0.88mm × 0.88mm CSP (CS) Top View Pin Description Pin Number (Thin MLF®) Ball Number (CSP) Pin Name 1 A2 VOUT Power switch output. 2 B2 GND Ground. 3 B1 EN Enable input. A logic HIGH signal on this pin enables the part. Logic LOW disables the part. Do not leave floating. 4 A1 VIN Power switch input and chip supply. EP – ePad February 2012 Pin Name Exposed Heatsink Pad. Connect to Ground for best thermal performance. 3 M9999-020612-A Micrel, Inc. MIC94310 Functional Block Diagram February 2012 4 M9999-020612-A Micrel, Inc. MIC94310 Absolute Maximum Ratings(1) Operating Ratings(2) Input Voltage (VIN) .............................................. -0.3 to +4V Output Voltage (VOUT) .................... –0.3 to VIN+0.3V or +4V Enable Voltage (VEN)...................... –0.3 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 Thin MLF® (θJA)................................................173°C/W CSP (θJA) .........................................................250°C/W Electrical Characteristics(4) VIN = VEN = VOUT + 500mV (VIN = VEN = 3.6V for VOUT ≥ 3.1V); IOUT = 1mA; COUT = 1µF; TA = 25°C, bold values indicate –40°C≤ TJ ≤ +125°C, unless noted. Parameter Condition Min. Max. Units 3.6 V ±1 +3 % VIN to VOUT dropout at 100mA output current 20 50 VIN to VOUT dropout at 200mA output current 40 100 Load Regulation 1mA to 100mA 4 Line Regulation VIN = VOUT + 500mV to 3.6V 0.01 0.5 % Ground Current No load to full load 170 250 µA Shutdown Current VEN = 0V 0.2 5 µA f = 100Hz, IOUT = 100mA 85 f = 100kHz, IOUT = 100mA 68 f = 1MHz, IOUT = 100mA 57 f = 10MHz, IOUT = 100mA 50 1.8 Input Voltage Output Voltage Accuracy Dropout Voltage VIN Ripple Rejection Typ. –3 Variation from nominal VOUT Current Limit VOUT = 0V Total Output Noise 10Hz to 100kHz 250 Turn-On Time 400 mV mV dB 700 mA 83 μVRMS 70 μs Enable 0.4 Input Logic Low 1.0 Input Logic High Input Current V 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 recommended. Human body model, 1.5kΩ in series with 100pF. 4. Specification for packaged product only. February 2012 5 M9999-020612-A Micrel, Inc. MIC94310 Typical Characteristics PSRR COUT = 0.47µF 0 -20 -20 IOUT = 200mA -80 -100 IOUT = 10mA -60 VIN = 3.6V -80 VIN = 2.0V PSRR (dB) PSRR (dB) VIN = VIN(NOM) + 40mVpp LOAD = 100mA VOUT = 1.8V -80 -60 IOUT = 10mA FREQUENCY (Hz) -20 IOUT = 100mA -80 VIN = 3.6V -100 PSRR COUT = 2.2µF -20 -60 VIN = 2.5V + 40mVpp VOUT = 1.8V -100 VIN = 2.5V + 40mVpp VOUT = 1.8V -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M 0 IOUT = 200mA IOUT = 100mA -100 0 -40 IOUT = 200mA -80 PSRR COUT = 2.2µF 0 VIN = 2.5V -40 FREQUENCY (Hz) PSRR COUT = 1µF -60 VIN = VIN(NOM) + 40mVpp LOAD = 100mA VOUT = 1.8V -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M FREQUENCY (Hz) -40 VIN = 2.5V -40 -100 VIN = 2.5V + 40mVpp VOUT = 1.8V -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M -20 -20 VIN = 2.0V IOUT = 100mA -60 0 PSRR (dB) -40 PSRR COUT = 1µF PSRR (dB) 0 PSRR (dB) PSRR (dB) PSRR COUT = 0.47µF -40 VIN = VIN(NOM) + 40mVpp LOAD = 100mA VOUT = 1.8V VIN = 2.0V VIN = 2.5V -60 -80 VIN = 3.6V -100 IOUT = 10mA -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M FREQUENCY (Hz) FREQUENCY (Hz) PSRR COUT = 4.7µF PSRR COUT = 10µF 0 0 -20 PSRR (dB) IOUT = 200mA IOUT = 100mA -60 -80 -100 IOUT = 10mA VIN = 2.5V + 40mVpp VOUT = 1.8V -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M FREQUENCY (Hz) February 2012 -40 -60 -80 -100 -20 VIN = 2.0V VIN = 2.5V PSRR (dB) -20 PSRR (dB) FREQUENCY (Hz) PSRR COUT = 4.7µF 0 -40 -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M VIN = 3.6V VIN = VIN(NOM) + 40mVpp LOAD = 100mA VOUT = 1.8V -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M FREQUENCY (Hz) 6 -40 IOUT = 200mA IOUT = 100mA -60 -80 -100 IOUT = 10mA VIN = 2.5V + 40mVpp VOUT = 1.8V -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M FREQUENCY (Hz) M9999-020612-A Micrel, Inc. MIC94310 Typical Characteristics (Continued) PSRR COUT = 10µF PSRR (Varying COUT) 0 0 0 VIN = VIN(NOM) + 40mVpp LOAD = 100mA VOUT = 1.8V COUT = 0.47µF -20 VIN = 2.0V -60 -80 -40 -60 -80 VIN = 3.6V -40 VIN = 2.5V + 40mVpp LOAD = 100mA VOUT = 1.8V -100 -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M -120 1.E+01 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M FREQUENCY (Hz) -80 1.900 30 1.875 OUTPUT VOLTAGE (V) 35 25 20 15 10 5 0 -120 10 1.E+02 100 1.E+03 1K 1.E+04 10K 1.E+05 100K 1.E+06 1M 1.E+07 10M 1.E+01 FREQUENCY (Hz) Output Voltage vs. Input Voltage 2.00 1.95 1.850 1.825 1.800 1.775 1.750 VIN = 3.6V 100 125 150 175 20 OUTPUT CURRENT (mA) Output Noise Spectral Density GROUND CURRENT (μA) 1.00 V IN = VEN = 3.1V CIN = COUT = 1µF V OUT = 1.8V NOISE (10Hz to 100kHz) = 82.55µVRMS 100 1.E+02 1k 1.E+03 10k 1.E+04 FREQUENCY (Hz) February 2012 40 60 1.75 IOUT = 200mA 1.70 80 100 120 140 160 180 200 2 2.2 170 165 160 155 VIN =2.8V 2.4 2.6 2.8 3 3.2 3.4 3.6 INPUT VOLTAGE (V) Ground Current vs. Output Current 175 0.01 10 1.E+01 1.80 OUTPUT CURRENT (mA) 10.00 0.10 1.85 1.60 0 200 Ground Current vs. Input Voltage 190 GROUND CURRENT (μA) 75 1.90 1.65 CIN = COUT = 1µF 1.700 50 V IN = 2.5V + 40mVpp LOAD = 100mA V OUT = 1.8V -100 Output Voltage vs. Output Current 1.725 25 COUT = 4.7µF FREQUENCY (Hz) Dropout Voltage vs. Output Current 0 COUT = 10µF -60 COUT = 2.2µF -100 DROPOUT VOLTAGE (mV) COUT = 2.2µF PSRR (dB) VIN = 2.5V PSRR (dB) PSRR (dB) -40 -20 COUT = 1µF OUTPUT VOLTAGE (V) -20 Noise µV/√Hz PSRR (Varying COUT) 180 IOUT = 200mA 170 160 IOUT = 100mA 150 140 CIN = COUT =1µF 130 CIN = COUT =1µF 100k 1.E+05 1M 1.E+06 150 120 0 20 40 60 80 100 120 140 160 180 200 OUTPUT CURRENT (mA) 7 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 INPUT VOLTAGE (V) M9999-020612-A Micrel, Inc. MIC94310 Functional Characteristics February 2012 8 M9999-020612-A Micrel, Inc. MIC94310 Application Information Enable/Shutdown Forcing the enable (EN) pin low disables the MIC94310 and sends it into a “zero” off mode current state. In this state, current consumed by the MIC94310 goes nearly to zero. Forcing EN high enables the output voltage. The EN pin uses CMOS technology and cannot be left floating as it could cause an indeterminate state on the output. The MIC94310 is a very-high PSRR, fixed-output, 200mA LDO utilizing Ripple Blocker™ technology. The MIC94310 is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Input Capacitor The MIC94310 is a high-performance, high-bandwidth device. An input capacitor of 0.47µF is required from the input to ground to provide stability. Low-ESR ceramic capacitors provide optimal performance at 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 therefore, not recommended. Thermal Considerations The MIC94310 is designed to provide 200mA 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. For example if the input voltage is 2.5V, the output voltage is 1.8V, and the output current = 200mA. The actual power dissipation of the Ripple Blocker™ can be determined using the equation: Output Capacitor In order to maintain stability, the MIC94310 requires an output capacitor of 0.47µF or greater. For optimal ripple rejection performance a 1µF 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 1µF ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric type ceramic capacitors are recommended because of their temperature 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 their value by as much as 50% and 60%, respectively, over their operating temperature ranges. To use a ceramic chip capacitor with the 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 – VOUT1) I OUT + VIN IGND Because this device is CMOS and the ground current is typically <170µA over the load range, the power dissipation contributed by the ground current is <1% and can be ignored for this calculation. PD = (2.5V – 1.8V) × 200mA PD = 0.14W To determine the maximum ambient operating temperature of the package, 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 = 173°C/W for the Thin MLF® package. No Load Stability The MIC94310 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications. February 2012 ⎞ ⎟ ⎟ ⎠ Substituting PD for PD(MAX) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The maximum power dissipation must not be exceeded for proper operation. 9 M9999-020612-A Micrel, Inc. MIC94310 For example, when operating the MIC94310-GYMT at an input voltage of 2.5V and 200mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.14W = (125°C – TA)/(173°C/W) TA = 101°C Therefore, the maximum ambient operating temperature allowed in a 1.2mm x 1.6mm Thin MLF® package is 101°C. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the “Regulator Thermals” section of Micrel’s Designing with LowDropout 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 February 2012 10 M9999-020612-A Micrel, Inc. MIC94310 Evaluation Board Schematic Bill of Materials Item C1, C2 U1 Part Number GRM155R61A105KE15D MIC94310xx-YMT Manufacturer (1) Murata Micrel, Inc. (2) Description Qty. Capacitor, 1µF Ceramic, 10V, X7R, Size 0402 2 200mA Ripple Blocker™ with Fixed Output Voltage 1 Notes: 1. Murata Tel: www.murata.com. 2. Micrel, Inc.: www.micrel.com. February 2012 11 M9999-020612-A Micrel, Inc. MIC94310 Package Information1 4-Ball 0.88mm × 0.88mm 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. February 2012 12 M9999-020612-A Micrel, Inc. MIC94310 Package Information1 (Continued) 4-Pin 1.2mm × 1.6mm Thin MLF® (MT) 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. February 2012 13 M9999-020612-A