MIC5323 High PSRR Low Noise 300mA µCap Ultra-Low Dropout LDO Regulator General Description The MIC5323 is a high-performance, 300mA LDO regulator, offering extremely high PSRR and very low noise while consuming low ground current. Ideal for battery operated applications, the MIC5323 features 2% accuracy, extremely low dropout voltage (120mV @ 300mA), and low ground current at light load (typically 90µA). When disabled, the MIC5323 typically consumes less than 1µA. The MIC5323 is a µCap design operating with small ceramic output capacitors for stability, thereby reducing required board space and component cost. The MIC5323 is available in fixed output voltages and adjustable output voltages in the super compact 6-pin 2mm × 2mm Thin MLF® and thin SOT-23-5 package. Additional voltage options are available. Contact Micrel marketing. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. Features Ultra low dropout voltage of 120mV @ 300mA Input voltage range: 2.65 to 5.5V Stable with ceramic output capacitor 300mA guaranteed output current Low output noise — 20µVrms High PSRR, up to 80dB @1kHz Less than 30µs turn-on time with CBYP = 0.1µF High output accuracy: ±2.0% over temperature Thermal shutdown protection Current limit protection 6-pin 2mm × 2mm Thin MLF® package Thin SOT-23-5 package Applications Cellular phones Notebook and Tablet Computers Fiber optic modules Portable electronics Instrumentation Systems Audio Codec power supplies Typical Application Power Supply Rejection Ratio (CBYP = 0.1µF) 0 -10 IOUT = 300mA PSRR (dB) -20 -30 -40 -50 -60 IOUT = 100mA IOUT = 1mA -70 -80 VIN = VOUT + 1V -90 VOUT = 1.8V -100 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 FREQUENCY (Hz) MicroLeadFrame and MLF are trademarks of Amkor, 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 November 2011 1 M9999-110311B Micrel, Inc. MIC5323 Ordering Information Part Number(1) Marking(2) MIC5323-1.8YMT Voltage Junction Temp. Range(2) 23G 1.8V –40°C to +125°C 6-Pin 2mm x 2mm Thin MLF® MIC5323-2.8YMT 23M 2.8V –40°C to +125°C 6-Pin 2mm x 2mm Thin MLF® MIC5323-3.3YMT 23S 3.3V –40°C to +125°C 6-Pin 2mm x 2mm Thin MLF® MIC5323YMT 23A ADJ –40°C to +125°C 6-Pin 2mm x 2mm Thin MLF® MIC5323-1.8YD5 2318 1.8V –40°C to +125°C Thin SOT23-5 MIC5323-2.8YD5 2328 2.8V –40°C to +125°C Thin SOT23-5 MIC5323-3.3YD5 2333 3.3V –40°C to +125°C Thin SOT23-5 (3) Package Notes: 1. For other output voltage and/or temperature options, contact Micrel marketing. 2. Underbar/Overbar symbols may not be to scale. ® 3. Pin 1 identifier for 2x2 Thin MLF is “▲” symbol. November 2011 2 M9999-110311B Micrel, Inc. MIC5323 Pin Configuration ® MIC5323-x.xYMT (Fixed) 6-Pin 2mm x 2mm Thin MLF (MT) (Top View) MIC5323YMT (Adjustable) 6-Pin 2mm x 2mm Thin MLF® (MT) (Top View) MIC5323-x.xYD5 (Fixed)TSOT-23-5 (D5) (Top View) Pin Description Pin Number Thin MLF®-6 Adjustable Pin Number Thin MLF®-6 Fixed Pin Number TSOT23-5 Fixed 1 1 2 2 Pin Name Pin Description 3 EN Enable Input: Active High. High = on, low = off. Do not leave floating. 2 GND Ground. 3 3 1 VIN Supply Input. 4 4 5 VOUT Output Voltage. 5 – – ADJ Adjust Input: Connect to external resistor voltage divider network. – 5 – NC No connection for fixed voltage parts. 6 6 4 BYP Reference Bypass: Connect external 0.1µF capacitor to GND for reduced output noise. May be left open. EPAD EPAD – EPAD Exposed Heatsink Pad: Connect to ground plane for performance enhancement. November 2011 3 M9999-110311B Micrel, Inc. MIC5323 Absolute Maximum Ratings (1) Operating Ratings (2) Supply Voltage (VIN) ............................................... 0V to 6V Enable Input Voltage (VEN)..................................... 0V to 6V Power Dissipation (PD) ........................... Internally Limited(3) Junction Temperature (TJ) ........................–40°C to +125°C Lead Temperature (soldering, 5sec.)......................... 260°C Storage Temperature (Ts) .........................–65°C to +150°C ESD Rating(4) .................................................................. 2kV Supply voltage (VIN) ....................................... 2.65V to 5.5V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature (TJ) ........................ –40°C to +125°C Junction Thermal Resistance 2mm x 2mm Thin MLF® 6 pin (θJA)....................93°C/W TSOT-23-5 (θJA) ..............................................235°C/W Electrical Characteristics (5) VIN = VOUT + 1.0V; COUT = 2.2µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted. Parameter Condition Min Ouput Voltage Accuracy Variation from nominal VOUT, IOUT = 100µA to 300mA –2.0 Line Regulation VIN = VOUT +1V to 5.5V Load Regulation IOUT = 100µA to 300mA Dropout Voltage IOUT = 50mA, VOUT > 2.8V 20 35 mV IOUT = 150mA, VOUT > 2.8V 60 85 mV IOUT = 300mA, VOUT > 2.8V 120 170 mV (6) Typ Max Units +2.0 % 0.02 0.3 %/V 0.1 0.5 % IOUT = 50mA, VOUT =< 2.8V 25 45 mV IOUT = 150mA, VOUT =< 2.8V 75 110 mV IOUT = 300mA, VOUT =< 2.8V 150 220 mV IOUT = 0 to 300mA 90 150 µA Ground Pin Current in Shutdown VEN = 0V 0.5 2 µA Ripple Rejection f = 1kHz; COUT = 2.2µF ceramic; CBYP = 0.1µF 80 Ground Pin Current (7) f = 10kHz; COUT = 2.2µF ceramic; CBYP = 0.1µF 65 350 Current Limit VOUT = 0V Output Voltage Noise COUT =2.2µF, CBYP = 0.1µF, 10Hz to 100kHz 20 Turn-On Time COUT = 2.2µF; CBYP= 0.1µF; IOUT = 300mA 30 Enable Input Voltage Logic Low 600 dB 900 mA µVrms 150 µs 0.2 V 1.2 Logic High Enable Input Current dB V VIL ≤ 0.2V 0.01 1 µA VIH ≥ 1.2V 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. 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. 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 5. Specification for packaged product only. 6. 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. 7. 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. November 2011 4 M9999-110311B Micrel, Inc. MIC5323 Typical Characteristics Power Supply Rejection Ratio (CBYP=1µF) 0 0 0 -10 -10 PSRR (dB) -30 IOUT = 100mA -40 -50 IOUT = 1mA -60 IOUT = 300mA -20 -30 IOUT = 100mA -40 -50 IOUT = 1mA -60 -30 IOUT = 100mA -40 -50 IOUT = 1mA -60 -70 -70 -80 VIN = V OUT + 1V -80 VIN = VOUT + 1V -80 VIN = VOUT + 1V -90 VOUT = 1.8V -90 VOUT = 1.8V -90 VOUT = 1.8V -100 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 FREQUENCY (Hz) FREQUENCY (Hz) Ground Current vs. Input Voltage 110 -100 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 -100 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 FREQUENCY (Hz) Ground Current vs. Output Current 90 80 IOUT = 100mA IOUT = 100µA 70 60 VOUT = 1.8V GROUND CURRENT (µA) IOUT = 300mA 100 100 90 80 70 VIN = VOUT + 1V 60 VOUT = 1.8V 50 50 2.5 3.0 3.5 4.0 4.5 5.0 50 INPUT VOLTAGE (V) 100 150 200 250 IOUT = 150mA IOUT = 300mA 1.5 3.5 4.0 4.5 INPUT VOLTAGE (V) November 2011 VOUT = 1.8V -40 800 160 700 140 600 500 400 300 -20 0 5.0 5.5 20 40 60 80 100 120 120 100 80 60 40 20 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) 5 5.0 VOUT = 2.8V 0 100 3.0 VIN = VOUT + 1V 60 Dropout Voltage vs. Output Current VOUT = 1.8V 2.5 70 TEMPERATURE (°C) 200 VOUT = 2.8V IOUT = 100µA IOUT = 100mA 300 DROPOUT (mV) CURRENT LIMIT (mA) 2.5 2.0 80 Current Limit vs. Input Voltage IOUT = 100µA 3.0 IOUT = 300mA 90 OUTPUT CURRENT (mA) Output Voltage vs. Input Voltage 3.5 100 50 0 5.5 Ground Current vs. Temperature 110 110 GROUND CURRENT (µA) GROUND CURRENT (µA) IOUT = 300mA -20 PSRR (dB) IOUT = 300mA -70 OUTPUT VOLTAGE (V) Power Supply Rejection Ratio (CBYP = 0.01µF) -10 -20 PSRR (dB) Power Supply Rejection Ratio (CBYP = 0.1µF) 5.5 0 50 100 150 200 250 300 OUTPUT CURRENT (mA) M9999-110311B Micrel, Inc. MIC5323 Dropout Voltage vs. Temperature 160 Output Voltage vs. Temperature 1.900 IOUT = 300mA 1.875 IOUT = 200mA 100 80 IOUT = 100mA 60 40 IOUT = 10mA 20 -20 0 20 40 60 80 1.825 1.800 1.775 1.750 VIN = 5.5V VOUT = 2.8V 1.725 0 -40 1.850 100 120 -40 0 20 40 60 80 100 120 Output Noise Spectral Density VIN = V OUT + 1V VIN = V OUT + 1V VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V CBY P = 0.01µF CBY P = 0.1µF CBY P = 1µF 0.100 0.010 1.000 0.100 0.010 Noise (10Hz-100kHz) = 18.7µV 0.001 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 FREQUENCY (Hz) November 2011 Output Noise Spectral Density 10.000 10.000 NOISE µV/√Hz NOISE µV/√Hz 1.000 -20 TEMPERATURE (°C) Output Noise Spectral Density VIN = VOUT + 1V IOUT = 100µA 1.700 TEMPERATURE (°C) 10.000 V OUT = 1.8V 1.000 NOISE µV/√Hz 120 OUTPUT VOLTAGE (V) DROPOUT (mV) 140 0.100 0.010 Noise (10Hz-100kHz) = 18.7µV 0.001 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 FREQUENCY (Hz) 6 Noise (10Hz-100kHz) = 18µV 0.001 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 FREQUENCY (Hz) M9999-110311B Micrel, Inc. MIC5323 Functional Characteristics November 2011 7 M9999-110311B Micrel, Inc. MIC5323 Functional Diagram MIC5323 Block Diagram – Fixed MIC5323 Block Diagram – Adjustable November 2011 8 M9999-110311B Micrel, Inc. MIC5323 Application Information Enable/Shutdown The MIC5323 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 a “zero” off mode current state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. The active high enable pin uses CMOS technology, and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. slowing turn on time. Refer to the Typical Characteristics section for performance with different bypass capacitors. No Load Stability Unlike many other voltage regulators, the MIC5323 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep alive applications. Adjustable Regulator Application Adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. The MIC5323 can be adjusted from 1.25V to 5.5V by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation: R1 V = VREF 1 + OUT R2 Input Capacitor The MIC5323 is a high performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 2.2µF capacitor is required from the input-to-ground to provide stability. Low ESR ceramic capacitors provide optimal performance using a minimum amount of space. Additional high frequency capacitors, such as small valued NPO dielectric type capacitors, help filter out high-frequency noise, and are a good practice in any RF based circuit. VREF = 1.25V Output Capacitor The MIC5323 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 may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 2.2µF ceramic output capacitor, and it 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, making them 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. Figure 1. Adjustable Voltage Application Bypass Capacitor A capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.1µF capacitor is recommended for applications that require low noise outputs. The bypass capacitor can be increased, further reducing noise and improving PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique, quick-start circuit allows the MIC5323 to drive a large capacitor on the bypass pin without significantly November 2011 9 M9999-110311B Micrel, Inc. MIC5323 Thermal Considerations The MIC5323 is designed to provide 300mA 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. Given that the input voltage is 3.3V, the output voltage is 2.8V and the output current = 300mA. The actual power dissipation of the regulator circuit can be determined using the equation: thermal resistance, 93°C/W. Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit consuming PD watts. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5323-2.8YMT at an input voltage of 3.3V and 300mA load with a minimum footprint layout, the maximum ambient can be solved for as follows: 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. 125C - TA 0.15W 93C/W PD = (3.3V – 2.8V) × 300mA PD = 0.15W TA 111C 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 Therefore, a 2.8V application at 300mA of output current can accept an ambient operating temperature of 111°C in a 6 pin 2mm x 2mm Thin MLF® 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: Where TJ(max) is the maximum junction temperature, 125°C, and θJA represents the junction-to-ambient November 2011 http://www.micrel.com/_PDF/other/LDOBk_ds.pdf 10 M9999-110311B Micrel, Inc. MIC5323 Typical Application Circuit (Fixed Output) Bill of Materials Item C1 C2 C3 Part Number C1608X5R0J225K Manufacturer TDK Murata(2) C1608X5R0J225K TDK(1) GRM188R60J225KE19D Murata(2) CL10B104KB8NNN Samsung(3) MIC5323YMT Qty. 1 GRM188R60J225KE19D U1 Description (1) Micrel, Inc. Ceramic Capacitor, 2.2µF, 6.3V, X5R, Size 0603 1 (4) Ceramic Capacitor, 100nF, 50V, X5R, Size 0603 1 300mA Low Noise Ultra Low Dropout LDO 1 Notes: 1. TDK: www.tdk.com 2. Murata: www.murata.com 3. Samsung: www.samsungsem.com 4. Micrel, Inc.: www.micrel.com November 2011 11 M9999-110311B Micrel, Inc. MIC5323 Typical Application Circuit (Adjustable Output) Bill of Materials Item C1 C2 C3 Part Number C1608X5R0J225K Manufacturer TDK Description Qty. (1) 1 GRM188R60J225KE19D Murata(2) C1608X5R0J225K TDK(1) GRM188R60J225KE19D Murata(2) CL10B104KB8NNN Samsung(3) Ceramic Capacitor, 2.2µF, 6.3V, X5R, Size 0603 1 Ceramic Capacitor, 100nF, 50V, X7R, Size 0603 1 (4) R1 CRCW060312K1FKEA Vishay Resistor, 10kΩ, 1%, 1/16W, Size 0603 1 R2 CRCW060312K1FKEA Vishay(4) Resistor, 10kΩ, 1%, 1/16W, Size 0603 1 300mA Low Noise Ultra Low Dropout LDO 1 U1 MIC5323YMT Micrel, Inc. (5) Notes: 1. TDK: www.tdk.com 2. Murata: www.murata.com 3. Samsung: www.samsungsem.com 4. Vishay: www.vishay.com 5. Micrel, Inc.: www.micrel.com November 2011 12 M9999-110311B Micrel, Inc. MIC5323 Layout Recommendations Top Layer Bottom Layer November 2011 13 M9999-110311B Micrel, Inc. MIC5323 Package Information 6-Pin 2mm x 2mm Thin MLF® (MT) 5-Pin TSOT-23 (D5) November 2011 14 M9999-110311B Micrel, Inc. MIC5323 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 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, +1time (408) 944-0800 +1 (408) 474-1000 WEB http:/www.micrel.com specifications and descriptionsTEL at any without notice. FAX 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 The information furnished by Micrelany in this data sheet is believed to be accurate and reliable. no responsibility is assumed for its whatsoever, and Micrel disclaims express or implied warranty relating to the sale and/orHowever, use of Micrel products including liabilitybyorMicrel warranties use. Micrel the purpose, right to change circuitry and specificationsofatany anypatent, time without notification the customer. relating to fitness forreserves a particular merchantability, or infringement copyright or other to intellectual property right. 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