MIC5528 High-Performance 500mA LDO in Thin and Extra Thin DFN Packages General Description Features The MIC5528 is a low-power, µCap, low dropout regulator designed for optimal performance in a very-small footprint. It is capable of sourcing up to 500mA of output current while only drawing 38µA of operating current. This highperformance LDO is a µCap design in a thermally enhanced 1.2mm × 1.2mm extra thin (0.4mm ht.) DFN package. It operates with small ceramic output capacitor for stability, thereby reducing required board space. • • • • • • • • • • Ideal for battery-operated applications, the MIC5528 offers ±2% accuracy, extremely low dropout voltage (260mV @ 500mA), and can regulate output voltages down to 1.0V. Equipped with a TTL logic-compatible enable pin, the MIC5528 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5528 is a µCap design, operating with very small ceramic output capacitors for stability, reducing required board space and component cost for space-critical applications. The MIC5528 has an operating junction temperature range of –40°C to 125°C. Input voltage range: 2.5V to 5.5V Fixed output voltages down to 1.0V ±2% Room temperature accuracy Low quiescent current 38µA Stable with 2.2µF ceramic output capacitors Low dropout voltage 260mV @ 500mA Auto discharge and internal enable pulldown Thermal-shutdown and current-limit protection 6-pin 1.2mm × 1.2mm extra thin DFN package 6-pin 1.2mm × 1.2mm thin DFN package Applications • • • • Portable communication equipment DSC, GPS, PMP, and PDAs Portable medical devices 5V POL applications Datasheets and support documentation are available on Micrel’s web site at: www.micrel.com. Typical Application Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com May 5, 2014 Revision 1.1 Micrel, Inc. MIC5528 Ordering Information Marking Code Output (1) Voltage AutoDischarge EN Pulldown Temperature Range MIC5528-3.3YMT CF 3.3V YES YES –40°C to +125°C 6-Pin 1.2mm × 1.2mm TDFN MIC5528-2.8YMX CI 2.8V YES YES –40°C to +125°C 6-Pin 1.2mm × 1.2mm XTDFN MIC5528-3.3YMX CF 3.3V YES YES –40°C to +125°C 6-Pin 1.2mm × 1.2mm XTDFN Part Number Package (2, 3, 4) Notes: 1. Other voltages available. Contact Micrel for details. 2. Thin DFN ▲ = Pin 1 identifier. 3. Extra Thin DFN ▼ = Pin 1 identifier. 4. Extra Thin and Thin DFN are GREEN, RoHS-compliant packages. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration 6-Pin 1.2mm × 1.2mm Thin DFN (MT) (Top View) 6-Pin 1.2mm × 1.2mm Extra Thin DFN (MX) (Top View) Pin Description Pin Number Pin Name XTDFN-6 1, 2 VOUT Output Voltage. When disabled the MIC5528 switches in an internal 25Ω load to discharge the external capacitors. 3 GND Ground. 4 EN Enable Input: Active High. High = ON; Low = OFF. The MIC5528 has an internal pulldown and this pin can be left floating. 5 NC No Connection. 6 VIN Supply Input. EP ePad May 5, 2014 Pin Function Exposed Heatsink Pad. Connect to GND for best thermal performance. 2 Revision 1.1 Micrel, Inc. MIC5528 Absolute Maximum Ratings(5) Operating Ratings(6) Supply Voltage (VIN) .......................................... –0.3V to 6V Enable Voltage (VEN). ........................................ –0.3V to VIN (7) Power Dissipation (PD) ........................... Internally Limited Lead Temperature (soldering, 10sec) ........................ 260°C Junction Temperature (TJ) ........................ –40°C to +150°C Storage Temperature (Ts) ......................... –65°C to +150°C (8) ESD Rating .................................................................. 3kV Supply Voltage (VIN) ......................................... 2.5V to 5.5V Enable Voltage (VEN) .............................................. 0V to VIN Junction Temperature (TJ) ........................ –40°C to +125°C Junction Thermal Resistance 1.2mm × 1.2mm Extra Thin DFN-6 (θJA) ......... 173°C/W Electrical Characteristics(9) VIN = VEN = VOUT + 1V; CIN = COUT = 2.2µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +85°C, unless noted. Parameter Output Voltage Accuracy Line Regulation Min. Typ. Variation from nominal VOUT –2.0 ±1 Variation from nominal VOUT; –40°C to +85°C –3.0 (10) (11) Ground Pin Current (12) Ground Pin Current in Shutdown Ripple Rejection Max. Units +2.0 % +3.0 0.02 0.3 %/V IOUT = 100µA to 500mA 14 65 mV IOUT = 150mA IOUT = 500mA 80 260 180 500 mV IOUT = 0mA IOUT = 500mA 38 42 55 65 µA 0.05 1 µA VIN = VOUT +1V to 5.5V; IOUT = 100µA Load Regulation Dropout Voltage Condition VEN = 0V f = 100Hz, IOUT = 100mA 70 dB f = 1kHz, IOUT = 100mA 60 dB 800 mA 525 Current Limit VOUT = 0V Output Voltage Noise f =10Hz to 100kHz 175 µVRMS Auto-Discharge NFET Resistance VEN = 0V; VIN = 3.6V ; IOUT = –3mA 25 Ω Enable Input Enable Pulldown Resistor Enable Input Voltage Enable Input Current Turn-On Time MΩ 4 0.2 Logic Low V 1.2 Logic High VEN = 0V 0.01 1 VEN = 5.5V 1.4 2 IOUT = 150mA 50 125 µA µs Notes: 5. Exceeding the absolute maximum rating can damage the device. 6. The device is not guaranteed to function outside its operating rating. 7. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. 8. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF. 9. Specification for packaged product only. 10. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 11. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. For outputs below 2.5V, dropout voltage is the input-to-output differential with the minimum input voltage 2.5V. 12. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current. May 5, 2014 3 Revision 1.1 Micrel, Inc. MIC5528 Typical Characteristics Dropout Voltage vs. Output Current Dropout Voltage vs.Temperature 260 350 220 DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) 240 200 180 160 140 120 100 80 60 40 VOUT = 3.3V CIN = COUT = 2.2µF 20 0 500mA 40 35 100µA 30 VEN = VIN VOUT = 3.3V CIN = COUT = 2.2µF 25 3 3.5 4 4.5 5 50 45 48 44 43 42 41 40 39 38 VIN = VEN = VOUT + 1 VOUT = 3.3V CIN = COUT = 2.2µF 3.30 3.25 3.20 VIN = VEN = VOUT+ 1V VOUT = 3.3V CIN = COUT = 2.2µF 300 400 OUTPUT CURRENT (mA) May 5, 2014 38 36 100µA VIN = VEN = VOUT + 1V VOUT = 3.3V CIN = COUT = 2.2µF 34 -20 500 0 20 40 60 80 Output Voltage vs.Temperature 3.45 3.3 50mA 3.2 3.1 300mA 3.0 2.9 2.8 2.7 500mA VIN = VOUT + 1V VOUT = 3.3V CIN =COUT = 2.2µF 3.4 3.35 300mA 3.3 3.25 VIN = VEN = VOUT + 1 VOUT = 3.3V CIN = COUT = 2.2µF 2.5 200 300mA 3.5 2.6 3.10 80 TEMPERATURE (°C) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 3.35 60 40 -40 3.4 3.40 40 42 Output Voltage vs.Supply Voltage 3.45 20 500mA 44 LOAD CURRENT (mA) 3.5 100 0 46 32 50 100 150 200 250 300 350 400 450 500 Output Voltage vs. Output Current 0 -20 30 0 3.50 50mA Ground Current vs. Temperature 46 5.5 VOUT = 3.3V CIN = COUT = 2.2µF 50 Ground Current vs. Load Current SUPPLY VOLTAGE (V) 3.15 100 -40 36 2.5 150 TEMPERATURE (°C) 37 20 300mA OUTPUT CURRENT (mA) GROUND CURRENT (µA) GROUND CURRENT (µA) GROUND CURRENT (µA) 45 200 50 100 150 200 250 300 350 400 450 500 Ground Current vs. Supply Voltage 50 250 0 0 55 500mA 300 3.2 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 4 5.0 5.5 -40 -20 0 20 60 40 80 TEMPERATURE (°C) Revision 1.1 Micrel, Inc. MIC5528 Typical Characteristics (Continued) Current Limit vs. Supply Voltage Output Noise Spectral Density (MIC5528-3.3YMT) 10 750 650 1 NOISE µV/√Hz CURRENT LIMIT (mA) 700 600 550 500 450 0.1 0.01 400 VIN = VEN1= 4.5V COUT = 2.2µF VOUT = 3.3V VOUT = 3.3V CIN = COUT = 2.2µF 350 300 2.5 3 3.5 4 4.5 SUPPLY VOLTAGE (V) May 5, 2014 5 5.5 0.001 10 100 1K 10K 100K 1M 10M FREQUENCY (Hz) 5 Revision 1.1 Micrel, Inc. MIC5528 Functional Characteristics May 5, 2014 6 Revision 1.1 Micrel, Inc. MIC5528 Functional Block Diagram May 5, 2014 7 Revision 1.1 Micrel, Inc. MIC5528 Application Information The MIC5528 is a high-performance, low-power 500mA LDO. The MIC5528 includes an auto-discharge circuit that is switched on when the regulator is disabled through the enable pin. The MIC5528 also offers an internal pulldown resistor on the enable pin to ensure the output is disabled if the control signal is tri-stated. The MIC5528 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Enable/Shutdown The MIC5528 comes with an active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into an off mode current state drawing virtually zero current. When disabled the MIC5528 switches an internal 25Ω load on the regulator output to discharge the external capacitor. Forcing the enable pin high enables the output voltage. The MIC5528 has an internal pull down resistor on the enable pin to disable the output when the enable pin is floating. Input Capacitor The MIC5528 is a high-performance, high-bandwidth device. An input capacitor of 2.2µF 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 MIC5528 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 3.6V, the output voltage is 3.3V, and the output current = 500mA. The actual power dissipation of the regulator circuit can be determined using Equation 1: Output Capacitor The MIC5528 requires an output capacitor of 2.2µF or greater to maintain stability. 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 2.2µF ceramic output capacitor and does not improve significantly with larger capacitance. 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 Equation 2: 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 value by as much as 50% and 60%, respectively, over their operating temperature ranges. To use a ceramic chip capacitor with 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 = (3.6 V − 3.3 V ) × 500mA PD = 0.150W Eq. 2 To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device Equation 3: TJ(MAX ) − TA PD(MAX ) = θ JA No-Load Stability Unlike many other voltage regulators, the MIC5528 remains stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications. May 5, 2014 Eq. 1 Eq. 3 TJ(MAX) = 125°C, the maximum junction temperature of the die, θJA thermal resistance = 173°C/W for the XTDFN package. 8 Revision 1.1 Micrel, Inc. MIC5528 Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-toambient thermal resistance for the minimum footprint is 173°C/W. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5528-3.3YMX at an input voltage of 3.6V and a 500mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as in Equation 4: 0.15W = (125°C − TA ) / (173°C / W ) TA = 99°C Eq. 4 Therefore, the maximum ambient operating temperature allowed in a thermally enhanced 1.2mm × 1.2mm XTDFN package is 99°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_ds.pdf May 5, 2014 9 Revision 1.1 Micrel, Inc. MIC5528 Typical Application Schematic Bill of Materials Item C1, C2 U1 Part Number GRM188R71A225KE15D MIC5528-xxYMT MIC5528-xxYMX Manufacturer Murata (13) Micrel, Inc .(14) Description Qty. Capacitor, 2.2µF Ceramic, 10V, X5R, Size 0603 2 High-Performance 500mA LDO in Thin and Extra Thin DFN Packages 1 Notes: 13. Murata: www.murata.com. 14. Micrel, Inc.: www.micrel.com. May 5, 2014 10 Revision 1.1 Micrel, Inc. MIC5528 PCB Layout Recommendations Top Layer Bottom Layer May 5, 2014 11 Revision 1.1 Micrel, Inc. MIC5528 Package Information(15) and Recommended Landing Pattern 6-Pin 1.2mm × 1.2mm Thin DFN (MT) Note: 15. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com. May 5, 2014 12 Revision 1.1 Micrel, Inc. MIC5528 Package Information(15) and Recommended Landing Pattern (Continued) 6-Pin 1.2mm × 1.2mm Extra Thin DFN (MX) May 5, 2014 13 Revision 1.1 Micrel, Inc. MIC5528 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. © 2013 Micrel, Incorporated. May 5, 2014 14 Revision 1.1