MIC5306 150mA Micropower µCap Baseband LDO General Description Features The MIC5306 is a micropower, µCap low dropout regulator designed for optimal performance in a small space. It is capable of sourcing 150mA of output current and only draws 16µA of operating current. This high performance LDO offers fast transient response and good PSRR while consuming a minimum of current. • • • • • Ideal for battery operated applications; the MIC5306 offers 1% accuracy, extremely low dropout voltage (45mV @ 100mA). Equipped with a TTL logic compatible enable pin, the MIC5306 can be put into a zero-off-mode current state, drawing no current when disabled. The MIC5306 is a µCap design, operating with very small ceramic output capacitors for stability, reducing required board space and component cost. The MIC5306 is available in fixed output voltages in Thin SOT23-5 packaging. Input voltage range: 2.25V to 5.5V Ultra-low IQ: Only 16µA operating current Stable with ceramic output capacitor Low dropout voltage of 45mV @ 100mA High output accuracy - ±1.0% initial accuracy - ±2.0% over temperature • Thermal Shutdown Protection • Current Limit Protection Applications • • • • • • Digital Logic Power Supply Stand-by power supply Cellular phones PDAs Portable electronics Notebook PCs _________________________________________________________________________________________________________ Typical Application 20 18 MIC5306 VIN 1µF GND 150mA 16 VOUT EN Ground Pin Current vs. Temperature 1µF Applications Co-processor 14 100µA 12 10 8 6 4 2 0 VOUT = 2.8V VIN = VOUT + 1V COUT = 1µF TEMPERATURE (°C) Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com August 2005 M9999-080805 (408) 955-1690 Micrel, Inc. MIC5306 Block Diagram VIN OUT EN 1.25V Reference GND Ordering Information Part Number Marking Code MIC5306-1.5YD5 MIC5306-2.8YD5 N915 N928 Output Voltage 1.5V 2.8V Junction Temperature Range Package -40°C to 125°C -40°C to 125°C TSOT23-5 TSOT23-5 Note: Other Voltage available. Contact Micrel for detail. August 2005 2 M9999-080805 (408) 955-1690 Micrel, Inc. MIC5306 Pin Configuration EN GND VIN 1 3 2 4 N/C 5 OUT MIC5306-x.xBD5 Pin Description August 2005 TSOT23 Pin No. Pin Description Pin Function 1 IN Supply Input 2 GND 3 EN 4 NC 5 OUT Ground Enable Input. Active High. High = on, low = off. Do not leave floating. No Connect Output Voltage 3 M9999-080805 (408) 955-1690 Micrel, Inc. MIC5306 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 ....................... -40°C to +125°C Lead Temperature (soldering, 5sec.) .................260°C Storage Temperature (Ts) ................. -65°C to +150°C Supply Input Voltage (VIN)........................2.25V to 5.5V Enable Input Voltage (EN1/EN2/LOWQ).................. 0V to VIN Junction Temperature (TJ) .................. -40°C to +125°C TSOT23-5(θJA) ............................................... 235°C Electrical Characteristics VIN = VOUT + 1.0V; COUT = 1.0µF, IOUT = 100µA; TI = 25°C, bold values indicate -40°C to +125, unless noted. Parameter Line Regulation Conditions Variation from nominal VOUT Variation from nominal VOUT; -40°C to +125°C VIN = VOUT +1V to 5.5V Load Regulation IOUT = 100µA to 150mA Output Voltage Accuracy Dropout Voltage(4) Ground Pin Current Ground Pin Current in Shutdown Ripple Rejection Current Limit Thermal Shutdown Thermal Shutdown Hysteresis Output Voltage Noise Enable Input Enable Input Voltage Enable Input Current Turn-on Time(5) Min -1 -2 Typ 0.01 0.5 IOUT = 50mA IOUT = 100mA IOUT = 150mA IOUT = 0mA to 150mA; VIN = 5.5V Max +1 +2 0.3 0.5 1 1.5 Units % % %/V % 25 45 65 200 16 25 µA VEN < 0.2V; VIN = 5.5V 0.01 1 µA f = 10Hz to 1kHz; COUT = 1µF; IOUT = 150mA f = 20kHz; COUT = 1µF; IOUT = 150mA VOUT = 0V 62 35 285 150 15 91 175 COUT = 1µF; 10Hz to 100kHz Logic Low Logic High VIL < 0.2V VIH > 1.0V COUT = 1µF mV dB 500 mA °C °C µVrms 0.2 V V µA µA µs 1.0 0.01 0.01 250 1 1 500 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. 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. 5. Turn-on time is measured from Ven=1V of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator. August 2005 4 M9999-080805 (408) 955-1690 Micrel, Inc. MIC5306 Typical Characteristics Ripple Rejection 20 -60 100µA -40 -30 -20 VOUT = 2.8V -10 VIN = VOUT + 1V COUT = 1µF 0 0.01 0.1 1 10 100 1000 FREQUENCY (kHz) GROUND CURRENT (uA) 18 Ground Pin Current vs. Supply Voltage 150mA 16 14 100µA 12 10 8 6 4 VOUT = 2.8V COUT = 1µF 2 0 2 3 2.5 20 40 60 80 100 120 140 OUTPUT CURRENT (mA) 60 50 40 30 10 VOUT = 2.8V VIN = VOUT + 1V COUT = 1µF 20 40 60 80 100 120 140 OUTPUT CURRENT (mA) 150mA 100µA VOUT = 2.8V VIN = VOUT + 1V COUT = 1µF TEMPERATURE (°C) Dropout Voltage vs. Output Current 70 20 2 0 Ground Pin Current vs. Temperature 100 90 80 70 60 50 40 30 20 Dropout Voltage vs. Temperature 150mA 100mA 50mA 25mA 10 0 TEMPERATURE (°C) 1E+02 Output Noise Spectral Density 1E+01 3 2.8 1E-00 2.6 2.4 VOUT = 2.8V COUT = 1µF 2.2 2 1 2 3 4 5 SUPPLY VOLTAGE (V) Current Limit vs. Supply Voltage 300 250 200 150 100 VOUT = 2.8V COUT = 1µF 0 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 SUPPLY VOLTAGE (V) VOUT = 2.8V VIN = VOUT + 1V COUT = 1µF IOUT = 100µA TEMPERATURE (°C) 1 ENABLE THRESHOLD (V) OUTPUT CURRENT (mA) VOUT = 2.8V VIN = VOUT + 1V COUT = 1µF 3.2 1 August 2005 2 3.4 1.5 50 6 4 Output Voltage vs. Temperature 2 100µA 350 8 6 4 8 Output Voltage vs. Supply Voltage 150mA 0 0 10 0 0 2.5 0.5 12 80 3 3.5 4 4.5 5 5.5 SUPPLY VOLTAGE (V) 16 14 12 10 16 14 0 0 DROPOUT VOLTAGE (mV) dB -50 20 18 18 DROPOUT VOLTAGE (mV) 150mA -70 GROUND CURRENT (µA) -80 Ground Pin Current vs. Output Current 1E-01 VOUT = 2.8V VIN = 3.8V COUT = 1µF ROUT 1E-02 0.01 0.1 1 10 100 1000 10000 FREQUENCY (kHz) Enable Threshold vs. Temperature 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 TEMPERATURE (C) 5 M9999-080805 (408) 955-1690 Micrel, Inc. MIC5306 Functional Characteristics Enable Turn-On Transient 5V 4V Output Voltage (20mV/div) Output Voltage (1V/div) Input Voltage (1V/div) Enable Voltage (1V/div) Line Transient Response VOUT = 2.8V VIN = V OUT + 1V COUT = 1µF VOUT = 2.8V VIN = VOUT + 1V COUT = 1µF Time (400µs/div) Time (100µs/div) Output Current (10mA/div) Output Voltage (50mV/div) Load Transient Response VOUT = 2.8V VIN = V OUT + 1V COUT = 1µF Time (10µs/div) August 2005 6 M9999-080805 (408) 955-1690 Micrel, Inc. MIC5306 Because this device is CMOS and the ground current is typically < 50µA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. Applications Information Input Capacitance A 1µF capacitor should be placed from IN to GND if there is more than 10 inches of wire between the input and the ac filter capacitor or if a battery is used as the input. PD = (3.8V – 2.8V) ⋅ 150mA PD = 0.15W To determine the maximum ambient operating temperature of the package, use the junction-toambient thermal resistance of the device and the following basic equation: Output Capacitance An output capacitor is required between OUT and GND to prevent oscillation. Larger values improve the regulator’s transient response. The output capacitor value may be increased without limit. PD(max) = The output capacitor should have below ESR 300mΩ and a resonant frequency above 1MHz. Ultra-low-ESR capacitors can cause a low amplitude oscillation on the output and/or underdamped transient response. Most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but are more expensive. Since many aluminum electrolytics have electrolytes that freeze at about –30°C, solid tantalums are recommended for operation below –25°C. JA TJ(max) = 125°C, the maximum junction temperature of the die θJA thermal resistance = 235°C/W Table 1 shows junction-to-ambient thermal resistance for the MIC5306 in the TSOT23-5 package. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.47µF for current below 10mA or 0.33µF for currents below 1mA. Package θJA Recommended Minimum Footprint θJC TSOT23-5 235°C/W 2°C/W Table 1. TSOT23-5 Thermal Resistance 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 235°C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Enable Forcing EN (enable/shutdown) high (>1V) enables the regulator. EN is compatible with CMOS logic gates. If the enable/shutdown feature is not required, connect EN (pin 3) to IN (supply input, pin 1). Current Limit There is overcurrent protection circuitry built into the MIC5306. Even with the output grounded, current will be limited to approximately 285mA. Further protection is provided by thermal shutdown. For example, when operating the MIC5306-2.8 at an input voltage of 3.8V and 150mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.15W = (125°C - T) / 235C°/W Thermal Considerations The MIC5306 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 3.8V, the output voltage is 2.8V and the output current equals 150mA. T = 89.75°C Therefore, a 2.8V application at 150mA of output current can accept an ambient operating temperature of 89.8°C in a TSOT23-5 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: The actual power dissipation of the regulator circuit can be determined using the equation: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf PD = (VIN – VOUT) IOUT + VIN IGND August 2005 TJ(max) – TA 7 M9999-080805 (408) 955-1690 Micrel, Inc. MIC5306 Package Information 5-Pin TSOT-23 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. © 2005 Micrel, Inc. August 2005 8 M9999-080805 (408) 955-1690