MIC94325/45/55 500mA LDO with Ripple Blocker Technology General Description Features The MIC943x5 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 MIC943x5 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 MIC943x5 operates from an input voltage of 1.8V to 3.6V. The MIC943x5 options include fixed (MIC94345/55) or adjustable (MIC94325) output voltages. The MIC94355 version offers an auto-discharge to discharge the output capacitor when the part is disabled. Packaged in a 0.84mm x 1.32mm 6-ball CSP or a 6-pin 1.6mm x 1.6mm Thin DFN, the MIC943x5 has a junction operating temperature range of –40C to +125C. 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 5MHz at 500mA load Rated to 500mA output current Fixed and adjustable output voltages Optional output auto-discharge when disabled 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 40C to +125C 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 MIC94355 PSRR COUT = 4.7µF 0 VIN = 2.8V + 40mVpp -20 VOUT = 1.8V PSRR (dB) COUT = 4.7µF -40 500mA -60 10mA -80 -100 200mA -120 10 100 1,000 1K 10,000 10K 100,00 100K 1,000,0 1M 10,000, 10M 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 October 2012 M9999-102512-A Micrel, Inc. MIC94325/45/55 Ordering Information Marking Code Output Voltage Auto Discharge Package1 Lead Finish 2R ADJ ─ 1.6mm x 1.6mm Thin DFN Pb-Free MIC94345-4YCS* L4 1.2V ─ 0.84mm x 1.32mm CSP Pb-Free MIC94345-FYCS* LF 1.5V ─ 0.84mm x 1.32mm CSP Pb-Free MIC94345-GYCS* X1 1.8V ─ 0.84mm x 1.32mm CSP Pb-Free MIC94345-MYCS* X2 2.8V ─ 0.84mm x 1.32mm CSP Pb-Free MIC94345-SYCS* X3 3.3V ─ 0.84mm x 1.32mm CSP Pb-Free MIC94345-4YMT* 4L 1.2V ─ 1.6mm x 1.6mm Thin DFN Pb-Free MIC94345-FYMT* FL 1.5V ─ 1.6mm x 1.6mm Thin DFN Pb-Free MIC94345-GYMT* 1X 1.8V ─ 1.6mm x 1.6mm Thin DFN Pb-Free MIC94345-MYMT* 2X 2.8V ─ 1.6mm x 1.6mm Thin DFN Pb-Free MIC94345-SYMT* 3X 3.3V ─ 1.6mm x 1.6mm Thin DFN Pb-Free MIC94355-4YCS* G9 1.2V Yes 0.84mm x 1.32mm CSP Pb-Free MIC94355-FYCS* G0 1.5V Yes 0.84mm x 1.32mm CSP Pb-Free MIC94355-GYCS* G1 1.8V Yes 0.84mm x 1.32mm CSP Pb-Free MIC94355-MYCS* G2 2.8V Yes 0.84mm x 1.32mm CSP Pb-Free MIC94355-SYCS* G3 3.3V Yes 0.84mm x 1.32mm CSP Pb-Free MIC94355-4YMT* 9G 1.2V Yes 1.6mm x 1.6mm Thin DFN Pb-Free MIC94355-FYMT* 0G 1.5V Yes 1.6mm x 1.6mm Thin DFN Pb-Free MIC94355-GYMT 2G 1.8V Yes 1.6mm x 1.6mm Thin DFN Pb-Free MIC94355-MYMT* 7G 2.8V Yes 1.6mm x 1.6mm Thin DFN Pb-Free MIC94355-SYMT* 8G 3.3V Yes 1.6mm x 1.6mm Thin DFN Pb-Free Part Number MIC94325YMT Notes: 1. Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Contact Micrel Marketing for availability. October 2012 2 M9999-102512-A Micrel, Inc. MIC94325/45/55 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) Pin Number (Thin DFN) Fixed Adjustable Fixed 1, 2 1 A2, B2 VOUT - 2 - ADJ Adjust input. Connect to resistive divider at VOUT to set the output voltage. Do not leave floating. 3 3 C2 GND Ground. 4 4 C1 EN Enable Input. A logic HIGH signal on this pin enables the part. Logic LOW disables the part. Do not leave floating. 5, 6 5, 6 A1, B1 VIN Power Switch Input And Chip Supply. EP EP – ePad October 2012 Ball Number (CSP) Pin Name Pin Name Power Switch Output. Exposed Heatsink Pad. Connect to Ground plane for best thermal performance. 3 M9999-102512-A Micrel, Inc. MIC94325/45/55 Functional Block Diagrams MIC94325 Adjustable Output MIC94345 Fixed Output October 2012 4 M9999-102512-A Micrel, Inc. MIC94325/45/55 Functional Block Diagrams (Continued) MIC94355 Fixed Output with Auto-Discharge October 2012 5 M9999-102512-A Micrel, Inc. MIC94325/45/55 Absolute Maximum Ratings(1) 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 Operating Ratings(2) 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 DFN (JA) ...................................................92°C/W CSP (JA) .........................................................160°C/W Electrical Characteristics(4) VIN = VEN = VOUT + 500mV (VIN = VEN = 3.6V for VOUT ≥ 3.1V); IOUT = 1mA; COUT = 4.7µF; TA = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Parameter Condition Min. Input Voltage Typ. Max. Units 1.8 3.6 V 3.4 V +3 % Output Voltage Range MIC94325 1.2 Output Voltage Accuracy Variation from nominal VOUT –3 Adjust Reference MIC94325 1.1 VIN to VOUT dropout at 50mA output current 10 VIN to VOUT dropout at 500mA output current 100 Load Regulation 1mA to 500mA 10 Line Regulation VIN = VOUT + 500mV to 3.6V, IOUT = 100mA 0.1 1 % Ground Current IOUT = 100µA 170 250 µA Shutdown Current VEN = 0V 0.2 5 µA f = 100Hz 85 f = 1KHz 85 f = 100KHz 57 f = 1MHz 60 f= 5MHz 50 Dropout Voltage VIN Ripple Rejection Current Limit VOUT = 0V Total Output Noise 10Hz to 100kHz 530 800 V 200 100 VIN = 3.6V, VEN = 0V, IOUT = -3mA dB 1100 mA μVRMS 150 50 MIC94355 Only mV mV 83 Turn-On Time Auto Discharge NFET Resistance ±1 μs Ω Enable 0.35 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. October 2012 6 M9999-102512-A Micrel, Inc. MIC94325/45/55 Typical Characteristics MIC94325 PSRR COUT = 4.7µF CFF = 3.3nF -20 -20 -30 -30 -40 -40 -50 500mA -60 -60 300mA -80 V IN = 2.4V + 40mvpp V OUT = 2.2V -110 10mA -120 10 1.00E+01 100 1K 0 PSRR (dB) -80 10mA -90 10mA 10 10 100 100 1K 1,000 10K 100,00 100K 1,000,0 1M 10,000, 10M 10,000 0 00 000 -20 100 VOUT = 1.8V 10mA 10mA PSRR (dB) -60 200mA 500mA -60 -80 MIC94355 PSRR COUT = 10µF 10K 100,00 100K 1,000,0 1M 10,000, 10M 10,000 0 00 000 10 10 V IN = 2.8V + 40mVpp V OUT = 1.8V -20 COUT = 10µF 200mA -40 500mA -80 10mA -100 -120 -120 10,000 10K 100,00 100K 1,000,0 1M 10,000, 10M 0 00 000 -60 -100 -100 1,000 1K FREQUENCY (Hz) 0 -40 500mA October 2012 10 MIC94355 PSRR COUT = 10µF COUT = 10µF 200mA FREQUENCY (Hz) 200mA -120 VIN = 2.5V + 40mVpp -40 1K 1,000 10mA -80 -100 0 VOUT = 1.8V 100 500mA -60 FREQUENCY (Hz) VIN = 3.6V + 40mVpp 10 -40 200mA MIC34355 PSRR COUT = 4.7µF -80 VOUT = 1.8V COUT = 4.7µF 500mA -80 FREQUENCY (Hz) COUT = 4.7µF 10K 100,00 100K 1,000,0 1M 10,000, 10M 10,000 0 00 000 VIN = 2.8V + 40mVpp -60 -120 -20 1K 1,000 MIC94355 PSRR COUT = 4.7µF -20 -40 100 1,000 1K 10,000 10K 100,00 100K1,000,0 1M 10,000, 10M 100 0 00 000 0 100 100 0 -100 1010 10 10 FREQUENCY (Hz) VOUT = 1.8V 500mA -110 CFF = 10nF 10mA -120 MIC94355 PSRR COUT = 4.7µF COUT = 4.7µF -100 PSRR (dB) 1K 10K 100K 1M 10M 1,000 10,000 100,00 1,000,0 10,000, 0 00 000 FREQUENCY (Hz) -20 300mA -70 V OUT = 2.2V COUT = 4.7µF VIN = 2.5V + 40mvpp CFF = 100nF -60 100 100 10M COUT = 4.7µF -50 V IN = 2.7V + 40mvpp -110 10 10 1.00E+07 VOUT = 2.2V -40 -120 -90 VIN = 2.7V + 40mvpp -30 -80 -100 MIC94325 PSRR COUT = 4.7µF CFF = 100nF -20 300mA -70 -100 -120 1M 10mA 500mA -60 -90 CFF = 10nF 100K 300mA -80 COUT = 4.7µF 10K -50 -70 -110 1.00E+03 1.00E+05 FREQUENCY (Hz) -40 CFF = 3.3nF PSRR (dB) -90 COUT = 4.7µF PSRR (dB) -70 -100 PSRR (dB) PSRR (dB) PSRR (dB) -50 -30 V OUT = 2.2V 500mA MIC94325 PSRR COUT = 4.7µF , CFF = 10nF -20 V IN = 2.7V + 40mvpp PSRR (dB) MIC94325 PSRR COUT = 4.7µF , CFF = 10nF -120 100 100 1,000 1K 10,000 10K 100,00 100K 1,000,0 1M 10,000, 10M 0 00 000 FREQUENCY (Hz) 7 10 100 1,000 1K 10,000 10K 100,00 100K 1,000,0 1M 10,000, 10M 0 00 000 FREQUENCY(Hz) M9999-102512-A Micrel, Inc. MIC94325/45/55 Typical Characteristics (Continued) MIC94355 PSRR COUT = 10µF VOUT = 1.8V 200mA -80 100mA -100 1.9 1.85 1.8 1.75 1.7 10 100 1K 1,000 10K 100,00 100K 1,000,0 1M 10,000, 10M 10,000 0 00 000 GROUND CURRENT (µA) 190 185 180 175 170 165 160 0 50 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA) October 2012 30 20 VOUT = 1.8V CIN = COUT = 4.7µF 0 50 100 150 200 250 300 350 400 450 500 Ground Current vs. Input Voltage MIC94355YMT Output Noise Spectral Density 10 500mA 200 300mA 1 190 180 170 100mA 50mA 160 150 0.1 0.01 VIN = VEN = 3V 140 COUT = 4.7µF/10V CIN = COUT = 1µF 0.001 120 150 40 LOAD (mA) 130 155 50 OUTPUT CURRENT (mA) 210 195 60 50 100 150 200 250 300 350 400 450 500 220 200 70 0 0 Ground Current vs. Output Current 80 10 CIN = COUT = 4.7µF 1.6 FREQUENCY (Hz) GROUND CURRENT (µA) VIN = 2.8V 1.65 -120 DROPOUT VOLTAGE (mV) PSRR (dB) 10mA -40 -60 90 1.95 COUT = 10µF OUTPUT VOLTAGE (V) -20 100 2 VIN = 3.6V + 40mVpp MOISE µV/√Hz 0 Dropout Voltage vs. Load Output Voltage vs. Output Current 1.8 2 2.2 2.4 2.6 2.8 3 3.2 INPUT VOLTAGE (V) 8 3.4 3.6 1010 100 1,0001K 10,000 10K100,00 100K 1M10,000, 10M 100 1,000,0 0 00 000 FREQUENCY (Hz) M9999-102512-A Micrel, Inc. MIC94325/45/55 Functional Characteristics October 2012 9 M9999-102512-A Micrel, Inc. MIC94325/45/55 Application Information Enable/Shutdown Forcing the enable (EN) pin low disables the MIC943x5 and sends it into a “zero” off mode current state. In this state, current consumed by the MIC943x5 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. For the MIC94325 adjustable part, the turn-on time is affected by the selection of the external feedback resistors and feed-forward capacitor. The relationship is approximately 2.2 x R2 x Cff, where R2 is the bottom resistor (connected from ADJ to GND) and Cff is the capacitor connected across R1 (from VOUT to ADJ). For stability, the feed-forward capacitor must be greater than 1nF. 10nF is recommended for best performance. When disabled, the MIC94355 switches a 50Ω (typical) load on the regulator output to discharge the external capacitors. The MIC943x5 family of products is a very-high PSRR, fixed-output, 500mA LDO utilizing Ripple Blocker technology. The MIC943x5 is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Input Capacitor The MIC943x5 is a high-performance, high-bandwidth device. An input capacitor of 4.7µF 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. Output Capacitor In order to maintain stability, the MIC943x5 requires an output capacitor of 4.7µF or greater. For optimal input voltage ripple rejection performance a 4.7µF capacitor is recommended. The design is optimized for use with lowESR ceramic chip capacitors. High-ESR capacitors are not recommended because they may cause highfrequency 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 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. Adjustable Regulator Application The MIC94325 output voltage can be adjusted by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation: R1 VOUT VADJ1 R2 VADJ = 1.1V Figure 1. Adjustable Output Voltage Thermal Considerations The MIC943x5 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. For example if the input voltage is 2.5V, the output voltage is 1.8V, and the output current = 500mA. The actual power dissipation of the Ripple Blocker™ can be determined using the equation: No Load Stability The MIC943x5 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications. October 2012 10 M9999-102512-A Micrel, Inc. MIC94325/45/55 PD = (VIN – VOUT1) I OUT + VIN IGND For more information about Micrel’s Ripple Blocker products, go to: 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. http://www.micrel.com/index.php/en/products/powermanagement-ics/ldos/linear-power-filters.html PD = (2.5V – 1.8V) × 500mA http://www.micrel.com/index.php/en/products/powermanagement-ics/ldos/linear-power-filters/article/1mic94300.html PD = 0.35W 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 http://www.micrel.com/index.php/en/products/powermanagement-ics/ldos/linear-power-filters/article/3mic94310.html 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 Thin DFN package. 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. For example, when operating the MIC94325-GYMT at an input voltage of 2.5V and 500mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.35W = (125°C – TA)/(92°C/W) TA = 92°C Therefore, the maximum ambient operating temperature allowed in a 1.6mm x 1.6mm Thin DFN package is 92°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 Low-Dropout Voltage Regulators handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk.pdf http://www.micrel.com/_PDF/other/LDO%20SG.B.pdf October 2012 11 M9999-102512-A Micrel, Inc. MIC94325/45/55 Typical Application Schematic (Adjustable Output) Bill of Materials Item Part Number CIN, COUT CL10A475K08NNNC CFF C1608X7R2AP/NK R1, R2 CRCW0402100KFKED U1 MIC94325YMT Manufacturer Samsung (1) TDK(2) Vishay(3) (4) Micrel, Inc. Description Qty. Capacitor, 4.7µF Ceramic, 16V, X5R, Size 0603 2 Capacitor, 10nF Ceramic, 50V, X7R, Size 0603 1 Resistor, 100kΩ, Size 0603 2 500mA LDO with Ripple Blocker Technology 1 Notes: 1. Samsung: http://www.semlcr.com. 2. TDK: www.tdk.com. 3. Vishay: www.vishay.com. 4. Micrel, Inc.: www.micrel.com. October 2012 12 M9999-102512-A Micrel, Inc. MIC94325/45/55 Typical Application Schematic (Fixed Output) Bill of Materials Item CIN, COUT U1 Part Number CL10A475K08NNNC MIC94345-xxYMT MIC94355-xxYMT Manufacturer Samsung (1) Micrel, Inc.(2) Description Qty. Capacitor, 4.7µF Ceramic, 16V, X5R, Size 0603 2 500mA LDO with Ripple Blocker Technology 1 Notes: 1. Samsung: http://www.semlcr.com/. 2. Micrel, Inc.: www.micrel.com. October 2012 13 M9999-102512-A Micrel, Inc. MIC94325/45/55 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. October 2012 14 M9999-102512-A Micrel, Inc. MIC94325/45/55 Package Information(1) (Continued) 6-Pin 1.6mm 1.6mm Thin DFN (MT) Note: 1. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com. October 2012 15 M9999-102512-A Micrel, Inc. MIC94325/45/55 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. October 2012 16 M9999-102512-A