MIC5301 Single, 150mA µCap ULDO™ General Description Features The MIC5301 is a high performance, single output ultra low LDO (ULDO™) regulator, offering low total output noise. The MIC5301 is capable of sourcing 150mA output current and offers high PSRR and low output noise, making it an ideal solution for RF applications. • • • • • • • • • Ultra low dropout voltage – 40mV @ 150mA Input voltage range: 2.3V to 5.5V 150mA guaranteed output current Stable with ceramic output capacitors Ultra low output noise – 30µVrms Low quiescent current – 85µA total High PSRR – up to 75dB@1kHz 35µs turn-on time High output accuracy – ± 2% initial accuracy – ± 3% over temperature • Thermal shutdown and current limit protection • Tiny 6-pin 1.6mm x 1.6mm MLF® leadless package • Thin SOT-23-5 package For battery operated applications, the MIC5301 offers 2% accuracy, extremely low dropout voltage (40mV @ 150mA), and low ground current (typically 85µA total). The MIC5301 can also be put into a zero-off-mode current state, drawing no current when disabled. The MIC5301 is available in the 1.6mm x 1.6mm MLF® package, occupying only 2.56mm2 of PCB area, a 36% reduction in board area compared to SC-70 and 2mm x 2mm MLF® packages. The MIC5301 has an operating junction temperature range of –40°C to +125°C and is available in fixed and adjustable output voltages in lead-free (RoHS compliant) MLF® and Thin SOT-23-5 packages. Applications Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • • • • • Mobile phones PDAs GPS receivers Portable electronics Digital still and video cameras Typical Application MIC5301-x.xYML VIN VIN VOUT EN 1µF BYP GND 1µF 0.01µF Portable Application ULDO is a trademark of Micrel, Inc. MLF and MicroLeadFrame are registered trademarks of Amkor Technologies, 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 2006 M9999-111506 Micrel, Inc. MIC5301 Ordering Information Part number Marking Code* Output Voltage** Temperature Range Package MIC5301-2.85YML 2JC 2.85V –40°C to +125°C 6-Pin 1.6 x 1.6 MLF® MIC5301YML MIC5301-2.85YD5 MIC5301YD5 CAA QC2J QCAA ADJ. 2.85V ADJ. –40°C to +125°C –40°C to +125°C –40°C to +125°C 6-Pin 1.6 x 1.6 MLF® 5-Pin TSOT-23 5-Pin TSOT-23 Notes: * Under bar / Over bar symbol may not be to scale. ** Other Voltages available. Contact Micrel for details. November 2006 2 M9999-111506 Micrel, Inc. MIC5301 Pin Configuration EN 1 6 BYP GND 2 5 NC IN 3 4 OUT EN 1 6 BYP GND 2 5 ADJ IN 3 4 OUT 6-Pin 1.6mm x 1.6mm MLF (ML) Fixed (Top View) 6-Pin 1.6mm x 1.6mm MLF (ML) Adjustable (Top View) EN GND IN 1 3 2 EN GND IN 1 3 2 4 BYP 4 ADJ 5 OUT TSOT-23-5 (D5) Fixed (Top View) 5 OUT TSOT-23-5 (D5) Adjustable (Top View) Pin Description Pin No. MLF-6 Fixed Pin No. MLF-6 Adj. Pin No. TSOT-23-5 Fixed Pin No. TSOT-23-5 Adj. Pin Name 1 1 3 3 EN 2 2 2 2 GND Pin Function Enable Input. Active High. High = on, low = off. Do not leave floating. Ground 3 3 1 1 IN 4 4 5 5 OUT Output Voltage. 5 – – – NC No connection. – 5 – 4 ADJ Adjust Input. Connect to external resistor voltage divider network. 6 6 4 – BYP Reference Bypass: Connect external 0.01µF to GND for reduced Output Noise. May be left open. HS Pad HS Pad – – E PAD November 2006 Supply Input. Exposed Heatsink Pad connected to ground internally. 3 M9999-111506 Micrel, Inc. MIC5301 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) .....................................0V to +6V Enable Input Voltage (VEN)...........................0V to +6V Power Dissipation, Internally Limited(3) Lead Temperature (soldering, 3sec) ..................260°C Storage Temperature (TS) ................ –65°C to +150°C Supply Voltage (VIN).............................. +2.3V to +5.5V Enable Input Voltage (VEN).............................. 0V to VIN Junction Temperature (TJ) ................. –40°C to +125°C Junction Thermal Resistance MLF-6 (θJA).............................................. 100°C/W TSOT-23-5 (θJA) ...................................... 235°C/W Electrical Characteristics(4) VIN = VOUT + 1.0V; COUT = 1.0µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted. Parameter Conditions Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage (5) Min Typ Max Units Variation from nominal VOUT -2.0 +2.0 % Variation from nominal VOUT; –40°C to +125°C -3.0 +3.0 % %/V %/V VIN = VOUT + 1V to 5.5V; IOUT = 100µA 0.02 0.3 0.6 IOUT = 100µA to 150mA 0.15 2.0 IOUT = 100µA 0.1 IOUT = 100mA 25 % mV 75 mV IOUT = 150mA 40 100 mV Ground Pin Current IOUT = 0 to 150mA 85 120 µA Ground Pin Current in Shutdown VEN ≤ 0.2V 0.01 2 µA Ripple Rejection f = 1kHz; COUT = 1.0µF; CBYP = 0.1µF 75 dB f = 20kHz; COUT = 1.0µF; CBYP = 0.1µF 50 dB Current Limit VOUT = 0V Output Voltage Noise COUT = 1.0µF; CBYP = 0.1µF; 10Hz to 100kHz 275 450 850 30 mA µVRMS Enable Input Enable Input Voltage Logic Low V 1 Logic High Enable Input Current 0.2 V VIL ≤ 0.2V 0.01 1 µA VIH ≥ 1.0V 0.01 1 µA 35 100 µs Turn-on Time Turn-on Time COUT = 1.0µF; CBYP = 0.1µF 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. Specification for packaged product only. 5. 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. November 2006 4 M9999-111506 Micrel, Inc. MIC5301 Functional Diagram VIN VOUT EN VREF QuickStart Error LDO Amp BYP Thermal Shutdown Current Limit GND MIC5301 Block Diagram – Fixed VIN VOUT EN QuickStart VREF Error LDO Amp BYP ADJ Thermal Shutdown Current Limit GND MIC5301 Block Diagram – Adjustable November 2006 5 M9999-111506 Micrel, Inc. MIC5301 Typical Characteristics Power Supply Rejection Ratio -90 -80 50mA -70 -60 -50 -40 -30 -20 -10 0 Dropout Voltage vs. Temperature 100µA 150mA VIN = 3.85V VOUT = 2.85V COUT = 1µF CBYP = 0.1µF 10 0.1 2.88 1 10 100 FREQUENCY (kHz) 1,000 60 55 VIN = VOUT + 1V = 2.8V V 50 COUT = 1µF OUT 45 40 35 30 25 20 15 10 5 0 50 45 150mA 40 35 30 25 100mA 20 15 10 5 50mA 25mA 0 0 TEMPERATURE (°C) Output Voltage vs. Output Current 3.0 2.87 Output Voltage vs. Supply Voltage 3.45 2.5 2.86 1.5 VIN = VOUT + 1V VOUT = 2.85V COUT = 1µF 25 50 75 100 125 150 OUTPUT CURRENT (mA) Output Voltage vs. Temperature 3.25 VOUT = 2.85V 2.0 2.85 Dropout Voltage vs. Output Current 3.05 100µA 2.85 150mA 2.84 VIN = VOUT + 1V VOUT = 2.85V COUT = 1µF 2.83 2.82 0 100 90 80 70 25 50 75 100 125 150 OUTPUT CURRENT (mA) Ground Current vs. Output Current 60 50 40 30 20 10 0 0 510 500 2.65 0.5 2.45 0 0 90 88 86 84 VIN = VOUT + 1V VOUT = 2.85V COUT = 1µF 25 50 75 100 125 150 OUTPUT CURRENT (mA) Current Limit vs. Input Voltage 82 80 78 76 74 72 70 1 2 3 4 5 SUPPLY VOLTAGE (V) 6 Ground Current vs. Temperature 150mA 100µA VIN = VOUT + 1V VOUT = 2.85V COUT = 1µF TEMPERATURE (°C) 10 490 480 470 460 2.25 VIN = VOUT + 1V VOUT = 2.85V COUT = 1µF IOUT = 100µA TEMPERATURE (°C) 100 90 80 70 Ground Current vs. Supply Voltage 150mA 100µA 60 50 40 30 20 10 0 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 5.5 Output Noise Spectral Density 1 0.1 450 440 430 420 410 3.0 1.0 VEN = VIN COUT = 1µF 3.5 4.0 4.5 5.0 INPUT VOLTAGE (V) November 2006 5.5 0.01 VIN = 4V VOUT = 2.85V COUT = 1µF CBYP = 0.1µF 0.001 0.01 0.1 1 10 100 1,000 10,000 FREQUENCY (kHz) 6 M9999-111506 Micrel, Inc. MIC5301 Functional Characteristics Load Transient Enable (0.5V/div) Output Voltage (20mV/div) Enable Turn-On 150mA VIN = VOUT + 1V Output Current (50mA/div) VOUT = 2.85V Output Voltage (1V/div) VIN = VOUT + 1V VOUT = 2.85V COUT = 1µF CBYP = 0.1µF COUT = 1µF 10mA Time (10µs/div) Time (40µs/div) Line Transient 5V Input Voltage (2V/div) 4V VIN = VOUT + 1V VOUT = 2.85V COUT = 1µF CBYP = 0.1µF Output Voltage (50mV/div) IOUT = 10mA Time (40µs/div) November 2006 7 M9999-111506 Micrel, Inc. MIC5301 Applications Information PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique, quick-start circuit allows the MIC5301 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Refer to the Typical Characteristics section for performance with different bypass capacitors. Enable/Shutdown The MIC5301 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. No-Load Stability Unlike many other voltage regulators, the MIC5301 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications. Input Capacitor The MIC5301 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1µF capacitor is required from the input to ground to provide stability. Low-ESR ceramic capacitors provide optimal performance at a minimum of space. Additional highfrequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out highfrequency noise and are good practice in any RFbased circuit. Adjustable Regulator Application Adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. The MIC5301 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 ⎞ ⎛ VOUT = VREF ⎜1 + ⎟ R2 ⎝ ⎠ VREF = 1.25V Output Capacitor The MIC5301 requires an output capacitor of 1µF 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 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 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. MIC5301YML VIN R1 1µF EN ADJ GND 1µF R2 Figure 1. Adjustable Voltage Output Thermal Considerations The MIC5301 is designed to provide 150mA of continuous current. 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 5.0V, the output voltage is 2.8V and the output current = 150mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT) IOUT + VIN IGND 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 November 2006 VOUT VIN VOUT 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 = (5V – 2.8V) × 150mA PD = 0.33W 8 M9999-111506 Micrel, Inc. MIC5301 To determine the maximum ambient operating temperature of the package, use the junction-toambient thermal resistance of the device and the following basic equation: PD(MAX) = ⎛ ⎝ The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5301-2.8YML at an input voltage of 5V and 150mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: TJ(MAX) - TA JA 0.33W = (125°C – TA)/(100°C/W) TJ(max) = 125°C, the maximum junction temperature of the die θJA thermal resistance = 100°C/W. TA=92°C The table below shows junction-to-ambient thermal resistance for the MIC5301 in the 6-pin 1.6mm x 1.6mm MLF® package. Therefore, a 2.8V application with 150mA of output current can accept an ambient operating temperature of 92°C in a 1.6mm x 1.6mm 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: θJA Recommended Minimum Footprint Package 6-Pin 1.6x1.6 MLF ® 100°C/W Thermal Resistance http://www.micrel.com/_PDF/other/LDOBk_ds.pdf Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-to-ambient thermal resistance for the minimum footprint is 100°C/W. November 2006 9 M9999-111506 Micrel, Inc. MIC5301 Package Information 6-Pin 1.6mm x 1.6mm MLF (ML) 5-Pin TSOT-23 (D5) November 2006 10 M9999-111506 Micrel, Inc. MIC5301 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 The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. 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. © 2006 Micrel, Inc. November 2006 11 M9999-111506