MIC5305 Micrel MIC5305 150mA µCap Ultra-Low Dropout LDO Regulator General Description Features The MIC5305 is a high-performance, 150mA LDO regulator, offering extremely high PSRR and very low noise while consuming low ground current. Ideal for battery-operated applications, the MIC5305 features 1% accuracy, extremely low-dropout voltage (60mV @ 150mA), and low ground current at light load (typically 90µA). Equipped with a logic-compatible enable pin, the MIC5305 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5305 is a µCap design operating with very small ceramic output capacitors for stability, thereby reducing required board space and component cost. The MIC5305 is available in fixed-output voltages and adjustable output voltages in the super-compact 2mm × 2mm MLF™-6 leadless package and thin SOT-23-5 package. Additional voltage options are available. Contact Micrel marketing. All support documentation can be found on Micrel’s web site at www.micrel.com. • • • • • • • • • • • • • Ultra-low dropout voltage of 60mV @ 150mA Input voltage range: 2.25 to 5.5V Stable with ceramic output capacitor 150mA guaranteed output current Low output noise — 20µVrms Low quiescent current of 90µA total High PSRR, up to 85dB @1kHz Less than 30µs turn-on time w/CBYP = 0.01µF High output accuracy: • ±1.0% initial accuracy • ±2.0% over temperature Thermal shutdown protection Current limit protection Tiny 2mm × 2mm MLF™-6 package Thin SOT-23-5 package Applications • • • • • • Cellular phones PDAs Fiber optic modules Portable electronics Notebook PCs Audio Codec power supplies Typical Application Dropout Voltage MIC5305 3.0V VIN 2.85V@150mA VOUT VIN VOUT 1µF EN BYP 0.1µF DROPOUT VOLTAGE (mV) 70 1µF 60 50 40 30 20 10 0 0 20 40 60 80 100 120 140 OUTPUT CURRENT (mA) GND 100 90 PSRR (Bypass Pin Cap = 0.1µF) 150mA PSRR (dB) 80 70 60 50 40 50mA 100µA 30 20 10 0 0.1 1 10 100 FREQUENCY (kHz) 1k MicroLeadFrame and MLF are trademarks of Amkor Technology. Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 474-1000 • fax + 1 (408) 474-1000 • http://www.micrel.com August 2004 1 M9999-081704 MIC5305 Micrel Ordering Information Marking Voltage Junction Temp. Range(1) Package MIC5305-1.5BML 815 1.5 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305-1.5BD5 N815 1.5 –40°C to +125°C Thin SOT23-5 MIC5305-1.8BML 818 1.8 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305-1.8BD5 N818 1.8 –40°C to +125°C Thin SOT23-5 MIC5305-2.5BML 825 2.5 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305-2.5BD5 N825 2.5 –40°C to +125°C Thin SOT23-5 MIC5305-2.6BML 826 2.6 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305-2.7BML 827 2.7 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305-2.8BML 828 2.8 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305-2.85BML 82J 2.85 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305-2.85BD5 N82J 2.85 –40°C to +125°C Thin SOT23-5 MIC5305-2.9BML 829 2.9 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305-2.9BD5 N829 2.9 –40°C to +125°C Thin SOT23-5 MIC5305-3.0BML 830 3.0 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305-3.0BD5 N830 3.0 –40°C to +125°C Thin SOT23-5 Part Number MIC5305-3.3BML 833 3.3 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305-4.75BML 84H 4.75 –40°C to +125°C 6-pin 2×2 MLF™ MIC5305BML(2) 8AA ADJ –40°C to +125°C 6-pin 2×2 MLF™ Note: 1. For other output voltage options, contact Micrel marketing. 2. Please contact Micrel marketing regarding availability. August 2004 2 M9999-081704 MIC5305 Micrel Pin Configuration EN 1 GND 2 VIN 3 6 BYP 5 NC 4 VOUT EN 1 6 BYP GND 2 5 ADJ VIN 3 MIC5305-x.xBML 6-Pin 2mm × 2mm MLF™ (ML) (Top View) 4 VOUT MIC5305BML (Adjustable) 6-Pin 2mm × 2mm MLF™ (ML) (Top View) EN GND VIN 3 2 1 KWxx 4 5 BYP VOUT MIC5305-x.xBD5 TSOT-23-5 (D5) (Top View) Pin Description Pin Number Pin Number Pin Number Pin Name MLF-6 Fixed MLF-6 Adjust. TSOT-23-5 Fixed Pin Function 1 1 3 EN 2 2 2 GND Ground. 3 3 1 VIN Supply Input. 4 4 5 VOUT 5 5 - - ADJ NC Adjust Input: Connect to external resistor voltage divider network. No connection for fixed voltage parts. 6 6 4 BYP Reference Bypass: Connect external 0.01µF to GND for reduced output noise. May be left open. HS Pad HS Pad - EPAD August 2004 Enable Input. Active High. High = on, low = off. Do not leave floating. Output voltage. Exposed Heatsink Pad connected to ground internally. 3 M9999-081704 MIC5305 Micrel Absolute Maximum Ratings(1) Operating Ratings(2) Supply Input 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 Storage Temperature (TS) ......................... –65°C to 150°C Lead Temperature (soldering, 5 sec.) ....................... 260°C ESD(4) .............................................................................................. 2kV Supply Input Voltage (VIN) ............................ 2.25V to 5.5V Enable Input Voltage (VEN) .................................. 0V to VIN Junction Temperature (TJ) ....................... –40°C to +125°C Package Thermal Resistance (est.) MLF-6 (θJA) ........................................................ 93 °C/W TSOT-23 (θJA) ................................................... 235°C/W Electrical Characteristics(5) VIN = VOUT +1.0V; COUT = 1.0µF, IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to + 125°C; unless noted. Parameter Condition Min Output Voltage Accuracy Variation from nominal VOUT Variation from nominal VOUT, IOUT = 100µA to 150mA Max Units –1.0 +1.0 % –2.0 +2.0 % Output Voltage Temp. Coefficient Typ 40 ppm/°C Line Regulation VIN = VOUT +1V to 5.5V 0.02 0.3 %/V Load Regulation(6) IOUT = 100µA to 150mA 0.1 0.5 % IOUT = 50mA 20 35 mV IOUT = 150mA 60 85 mV IOUT = 0 to 150mA 90 150 µA Ground Pin Current in Shutdown VEN ≤ 0.2V 0.5 µA Ripple Rejection f = up to 1kHz; COUT = 1.0µF ceramic; CBYP = 0.1µF 85 dB f = 10kHz; COUT = 1.0µF ceramic; CBYP = 0.1µF 65 dB Dropout Voltage(7) Ground Pin Current(8) Current Limit VOUT = 0V 300 600 Output Voltage Noise COUT =1µF, CBYP = 0.01µF, 10Hz to 100kHz 20 Turn-On Time COUT = 1µF; CBYP = 0.01µF; IOUT= 150mA 30 900 mA µVrms 100 µs 0.2 V Enable Input Enable Input Voltage Logic Low (Regulator Shutdown) Logic High (Regulator Enabled) Enable Input Current 1.0 V VIL ≤ 0.2V (Regulator Shutdown) 0.01 1 µA VIH ≥ 1.0V (Regulator Enabled) 0.01 1 µA Notes: 1. Exceeding maximum ratings may damage the device. 2. The device is not guaranteed to work outside its operating ratings. 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. 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. 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 2.25V, dropout voltage is the input-to-output differential with the minimum input voltage 2.25V. 8. 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. August 2004 4 M9999-081704 MIC5305 Micrel Typical Characteristics PSRR (Bypass Pin Cap = 0.01µF) 100 90 50mA 40 60 50 40 20 0 0.1 1 10 100 FREQUENCY (kHz) 1k Ground Pin Current 75 VIN = VOUT +1V Ground Pin Current GROUND CURRENT (µA) GROUND CURRENT (µA) 1 10 100 1000 OUTPUT CURRENT (mA) 90 80 70 60 50 40 30 20 10 0 0 2 DROPOUT VOLTAGE (mV) GROUND CURRENT (µA) 80 ILOAD = 100µA 1 2 3 4 5 INPUT VOLTAGE (V) 6 1.4 1.2 1 0.8 0.6 0.4 IOUT = 1mA 0.2 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 100µA 50 40 30 20 10 0 0.1 10 0 0.1 1 10 100 FREQUENCY (kHz) 1k 94 92 90 88 86 84 82 80 78 76 74 ILOAD = 100µA 72 70 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 50 40 30 20 10 0 0 100 90 ILOAD = 150mA 1 2 3 4 5 INPUT VOLTAGE (V) Dropout Voltage 60 50 40 30 20 10 IOUT = 50mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 5 1k Dropout Characteristics ILOAD = 100µA 3 2.5 2 ILOAD = 150mA 1.5 1 0.5 0 6 80 70 1 10 100 FREQUENCY (kHz) Ground Pin Current 3.5 60 50mA 94 92 90 88 86 84 82 80 78 76 74 ILOAD = 150mA 72 70 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Ground Pin Current 80 70 Dropout Voltage 1.8 1.6 August 2004 100µA 60 30 20 100 90 DROPOUT VOLTAGE (mV) GROUND CURRENT (µA) 85 100 50mA Ground Pin Current 90 70 0.1 PSRR (dB) 60 150mA 80 70 GROUND CURRENT (µA) PSRR (dB) PSRR (dB) 100µA 80 150mA 80 70 150mA PSRR (Bypass Pin Cap = 1µF) 100 90 OUTPUT VOLTAGE (V) 100 PSRR (Bypass Pin Cap = 0.1µF) 0 100 DROPOUT VOLTAGE (mV) 120 1 2 3 4 5 INPUT VOLTAGE (V) 6 Dropout Voltage 90 80 70 60 50 40 30 20 10 IOUT = 100mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) M9999-081704 MIC5305 Micrel VOUT (V) 2.9 2.89 2.88 2.87 2.86 ILOAD = 100µA VOUT = 2.9V 2.85 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 20 10 0 1 0 20 40 60 80 100 120 140 OUTPUT CURRENT (mA) Enable Threshold vs. Temperature 500 400 300 200 100 0 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) 6 Output Noise Spectral Density 1 0.9 0.8 0.7 0.6 0.5 0.4 ILOAD = 100µA 0.3 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 0.1 0.01 VIN = 5V 0.001 1000000 2.91 30 600 100000 Output Voltage vs. Temperature 40 700 10000 2.92 50 Short Circuit Current 1000 10 IOUT = 150mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 60 800 100 30 20 SHORT CIRCUIT CURRENT (mA) 50 40 Dropout Voltage 10 70 60 DROPOUT VOLTAGE (mV) 90 80 70 Spectral Noise Density (mA) Dropout Voltage ENABLE THRESHOLD VOLTAGE (V) DROPOUT VOLTAGE (mV) 100 FREQUENCY (Hz) August 2004 6 M9999-081704 MIC5305 Micrel Line Transient Response Output Voltage (50mV/div) Load Transient Response 3V CBYP = 0.01µF IOUT = 100µA COUT = 1µF Ceramic CBYP = 0.01µF VIN = 4V COUT = 1µF Ceramic Output Current (100mA/div) Output Voltage (1V/div) Input Voltage (1V/div) 5V TIME (400µs/div) TIME (4µs/div) Shutdown Delay Enable Voltage (1V/div) Output Voltage (1V/div) Output Voltage (1V/div) Enable Voltage (1V/div) Enable Pin Delay CBYP = 0.01µF IOUT = 100µA CIN = 1µF Ceramic COUT = 1µF Ceramic TIME (10µs/div) August 2004 CBYP = 0.01µF IOUT = 100µA VIN = 4V CIN = 1µF Ceramic COUT = 1µF Ceramic TIME (20ms/div) 7 M9999-081704 MIC5305 Micrel Functional Diagram VIN VOUT EN QuickStart VREF Error LDO Amp BYP Thermal Shutdown Current Limit GND MIC5305 Block Diagram August 2004 8 M9999-081704 MIC5305 Micrel No-Load Stability Unlike many other voltage regulators, the MIC5305 will remain stable and in regulation with no load. This is especially import 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 MIC5305 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: Applications Information Enable/Shutdown The MIC5305 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-modecurrent 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. Input Capacitor The MIC5305 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 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. Output Capacitor The MIC5305 requires an output capacitor of 1µF or greater to maintain stability. The design is optimized for use with lowESR 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. X7Rtype 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. 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 MIC5305 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. August 2004 R1 VOUT = VREF 1 + R2 VREF = 1.25V MIC5305BML VIN VOUT VIN VOUT R1 1µF EN ADJ GND 1µF R2 Figure 1. Adjustable Voltage Application Thermal Considerations The MIC5305 is designed to provide 150mA 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 5.0V, the output voltage is 2.9V 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 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 = (5.0V – 2.9V) × 150mA PD = 0.32W 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: T (max) − TA PD (max) = J θ JA TJ(max) = 125°C, the max. junction temperture of the die θJA thermal resistance = 93°C/W 9 M9999-081704 MIC5305 Micrel Table 1 shows junction-to-ambient thermal resistance for the MIC5305 in the 2mm × 2mm MLF™-6 package. Package θJA Recommended Minimum Footprint θJC 2 × 2 MLF™-6 93°C/W 2°C/W 0.32W = TA = 95.2°C Table 1. SOT-23-5 Thermal Resistance Therefore, a 2.9V application at 150mA of output current can accept an ambient operating temperature of 95.2°C in a 2mm x 2mm MLF™-6 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 LowDropout Voltage Regulators handbook. This information can be found on Micrel's website at: 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 93°C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5305-2.9BML at an input voltage of 5.0V and 150mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: August 2004 125°C − TA 93°C/W 10 M9999-081704 MIC5305 Micrel Package Information TOP VIEW BOTTOM VIEW DIMENSIONS IN MILLIMETERS SIDE VIEW Rev. 02 6-Pin MLF™ (ML) August 2004 11 M9999-081704 MIC5305 Micrel MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB USA 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2004 Micrel, Incorporated. August 2004 12 M9999-081704