MIC5265 150mA µCap LDO Regulator General Description Features The MIC5265 is a 150mA LDO in lead-free Thin SOT-23-5 packaging ideal for applications where cost is the priority. The MIC5265 is ideal for any application in portable electronics, including both RF and Digital applications. With low output noise and high PSRR, the MIC5265 is ideal for noise sensitive applications such as RF. While the fast transient response and active shutdown circuitry makes it well-suited for powering digital circuitry. The MIC5265 has a 2.7V to 5.5V input operating voltage range, making it ideal for operation from a single cell lithium ion battery or fixed 3.3V and 5V systems. The MIC5265 come with an enable pin and can be put into a zero off-mode current state. • • • • • • • • • 2.7V to 5.5V supply voltage. Low 75µA quiescent current per LDO. Thin SOT-23-5 package. Low Noise – 57µVrms. High PSRR – 60dB at 1kHz. Low dropout voltage – 210mV at 150mA. Stable with ceramic output capacitors. Fast transient response. Active shutdown. Applications • • • Cellular Telephones PDAs GPS Receivers The MIC5265 offers low dropout voltage (210mV at 150mA), low output noise (57µVrms), high PSRR and integrates an active shutdown circuit on the output of each regulator to discharge the output voltage when disabled. Data sheets and supporting documentation can be found on Micrel’s web site at: www.micrel.com ____________________________________________________________________________________________________________ Typical Application MIC5265-xxYD5 VIN Rx/Synth VOUT -70 -60 EN 1µF 1µF BYP -80 Power Supply Rejection Ratio GND 0.01µF -50 RF Receiver -40 -30 -20 VIN = VOUT + 1V VOUT = 3.1V -10 BYP = 0.1µF COUT = 1µF 0 0.01 0.1 1 10 100 FREQUENCY (kHz) 1000 RF Power Supply Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com April 2005 M9999-041505 (408) 955-1690 Micrel, Inc. MIC5265 Ordering Information Output Voltage Marking Code Junction Temp. Range Package MIC5265-1.5YD5 1.5V N715 –40°C to +125°C Pb-Free Thin SOT-23-5 MIC5265-1.8YD5 1.8V N718 –40°C to +125°C Pb-Free Thin SOT-23-5 MIC5265-2.5YD5 2.5V N725 –40°C to +125°C Pb-Free Thin SOT-23-5 MIC5265-2.6YD5 2.6V N726 –40°C to +125°C Pb-Free Thin SOT-23-5 MIC5265-2.8YD5 2.8V N728 –40°C to +125°C Pb-Free Thin SOT-23-5 MIC5265-2.9YD5 2.9V N72J –40°C to +125°C Pb-Free Thin SOT-23-5 MIC5265-3.0YD5 3.0V N730 –40°C to +125°C Pb-Free Thin SOT-23-5 MIC5265-3.1YD5 3.1V N731 –40°C to +125°C Pb-Free Thin SOT-23-5 MIC5265-3.3YD5 3.3V N733 –40°C to +125°C Pb-Free Thin SOT-23-5 Part Number Note: 1. Other Voltage Combinations available. Contact Micrel, Inc. for details. April 2005 2 M9999-041505 (408) 955-1690 Micrel, Inc. MIC5265 Pin Configuration EN GND VIN 1 3 2 4 BYP 5 OUT Lead-Free Thin SOT-23-5 (YD5) Pin Description Pin Number 1 Pin Name 2 GND 3 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown. Do not leave open. 4 BYP Reference Bypass: Connect external 0.01µF <= CBYP <= 1.0µF capacitor to GND to reduce output noise. May be left open. 5 OUT Regulator Output April 2005 IN Pin Function Supply Voltage Ground 3 M9999-041505 (408) 955-1690 Micrel, Inc. MIC5265 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Input Voltage (VIN).................................... 0V to +7V Enable Input Voltage (VEN1) ................................. 0V to +7V Power Dissipation (PD) .......................... Internally Limited (3) Junction Temperature (TJ) ...........................-40°C to 125°C Lead Temperature (soldering, #sec.)...........-55°C to 150°C Storage Temperature (Ts) .......................................... 260°C EDS Rating (4) ................................................................. 2kV Supply Input Voltage (VIN)............................ +2.7V to +5.5V Enable Input Voltage (VEN)................................... 0V to +VIN Junction Temperature (TA) ........................ –40°C to +125°C Junction Thermal Resistance Thin SOT-23-5 (θJA).........................................235°C/W Electrical Characteristics(5) VEN = VIN = VOUT + 1V; IL =100µA; CL = 1.0µF; CBYP = 0.01µF per output; TA = 25°C, bold values indicate –40°C< TA < +85°C; unless noted. Parameter Condition Output Voltage Accuracy IOUT = 100µA Line Regulation VIN = VOUT +1V to 5.5V Load Regulation IOUT = 0.1mA to 150mA Dropout Voltage Max Units 2 3 % % 0.05 0.2 % 2 3 % IOUT = 50mA IOUT = 150mA 75 210 500 mV mV Quiescent Current VEN < 0.2V 0.2 2 µA Ground Pin Current IOUT = 0mA IOUT = 150mA 75 80 120 150 µA µA f = 100Hz, CBYP = 0.1µF, ILOAD – 50mA f = 1kHz, CBYP = 0.1µF, ILOAD – 50mA f = 10kHz, CBYP = 0.1µF, ILOAD – 50mA VOUT = 0V COUT = 1.0µF, CBYP = 0.1µF, f = 10Hz to 100kHz 62 64 64 dB dB dB 225 mA µV (rms) PSRR (Ripple Rejection) Current Limit Output Noise Enable Input (EN1 and EN2) Enable Input Logic Low Enable Input Logic High Enable Input Current Min Typ -2 -3 VIN = 2.7V to 5.5V, regulator shutdown VIN = 2.7V to 5.5V, regulator enabled VIL < 0.4V, regulator shutdown VIH > 1.6V, regulator enabled 57 0.2 1.6 0.01 0.01 Thermal Shutdown Thermal Shutdown Temperature 150 Hysteresis 10 Turn-on/Turn-off Characteristics Turn-on Time Discharge Resistance 40 500 V V µA µA °C °C 150 µs Ω 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. The θJA of the MIC5265x.xYD5 (all versions) is 235°C/W on a PC board (see ”Thermal Considerations” section for further details). 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 5. Specification for packaged product only. April 2005 4 M9999-041505 (408) 955-1690 Micrel, Inc. MIC5265 Typical Characteristics -70 Power Supply Rejection Ratio -80 Power Supply Rejection Ratio -70 -70 -60 -60 -60 -50 -50 -50 -40 Power Supply Rejection Ratio -40 -40 -30 VIN = VOUT + 1V VOUT = 3.1V -10 BYP = 0.01µF COUT = 1µF 0 0.01 0.1 1 10 100 FREQUENCY (kHz) 0.30 -30 -30 -20 1000 Dropout Voltage vs. Output Current -20 VIN = VOUT + 1V VOUT = 3.1V -10 BYP = 0.1µF COUT = 1µF 0 0.01 0.1 1 10 100 FREQUENCY (kHz) 0.30 1000 Dropout Voltage vs. Temperature 3.25 0.25 25°C 0.20 0.20 0.15 0.15 -40°C 0.10 0.10 3.20 150mA 3.15 100mA 3.10 3.05 50mA 3.00 0.05 0.00 0 0.05 25 50 75 100 125 150 OUTPUT CURRENT (mA) 3 2.5 100µA Load 150µA Load 1.5 1 0.5 95 1 2 3 4 INPUT VOLTAGE(V) Ground Pin Current vs. Temperature 1mA 5 83 82 81 80 79 78 77 76 75 74 73 72 0 2.90 -40 -15 90 85 78 76 74 72 70 VIN = VOUT + 1V VOUT = 3.1V 30 60 90 120 150 OUTPUT CURRENT (mA) Ground Pin Current vs. Input Voltage Iload = 100µA 68 -40 90 70 70 60 60 50 50 75 40 40 30 20 65 Iload = 150mA 60 -40 April 2005 -10 20 50 80 110 TEMPERATURE (°C) 10 0 0 -10 20 50 80 110 TEMPERATURE (°C) Ground Pin Current vs. Input Voltage 80 80 70 10 35 60 85 110 TEMPERATURE (°C) Ground Pin Current vs. Temperature 80 90 Iload = 100µA VOUT = 3.1V VIN = VOUT + 1 2.95 Ground Pin Current vs. Output Current 2 0 0 10mA 0.00 -40 -15 10 35 60 85 110 TEMPERATURE (°C) Output Voltage vs. Input Voltage 1000 1000000 Dropout Voltage vs. Temperature 3.30 125°C 0.25 -20 VIN = VOUT + 1V VOUT = 3.1V -10 BYP = 1µF COUT = 1µF 0 10 100 1000 10000 0.01 0.1 1 10 100000 100 FREQUENCY (kHz) 30 20 Iload = 100µA VOUT = 3.1V VIN = VOUT + 1 1 2 3 4 INPUT VOLTAGE (V) 5 10 5 0 0 Iload = 150µA VOUT = 3.1V VIN = VOUT + 1 1 2 3 4 INPUT VOLTAGE (V) 5 M9999-041505 (408) 955-1690 Micrel, Inc. MIC5265 Typical Characteristics (continued) Short Circuit Current vs. Input Voltage 10 Output Noise Spectral Density 290 270 1 250 230 0.1 210 190 170 150 3 April 2005 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5 VIN = 4.2V 0.01 VOUT = 2.8V COUT = 1.0µF BYP = 0.1µF IOUT = 150mA 0.001 10 100 1000 10000 1000000 10000000 0.01 0.1 1 10 100000 100 1000 10000 FREQUENCY (kHz) 6 M9999-041505 (408) 955-1690 Micrel, Inc. MIC5265 Functional Characteristics Load Transient Response Output Voltage (50mV/div) 5.0V 4.0V COUT = 1µF Ceramic CBYP = 0.01µF IOUT = 150mA VOUT = 3.1V VIN = V OUT + 1V 150mA Output Current (50mA/div) Output Voltage (20mV/div) Input Voltage (1V/div) Line Transient Response Time (400µs/div) COUT = 1µF Ceramic CBYP = 0.01µF VOUT = 3.1V VIN = V OUT + 1V Time (5µs/div) Shutdown Delay Enable Voltage (1V/div) Enable Voltage (1V/div) Output Voltage (1V/div) Output Voltage (1V/div) Enable Pin Delay CIN = 1µF Ceramic CBYP = 0.01µF IOUT = 10mA VOUT = 3.1V VIN = VOUT + 1V Time (10µs/div) April 2005 100µA CIN = 1µF Ceramic COUT = 1µF Ceramic IOUT = 10mA VOUT = 3.1V VIN = V OUT + 1V Time (100µs/div) 7 M9999-041505 (408) 955-1690 Micrel, Inc. MIC5265 Block Diagram IN Reference Voltage Quickstart/ Noise Cancellation Startup/ Shutdown Control BYP EN Thermal Sensor FAULT Error Amplifier Current Amplifier OUT Undervoltage Lockout ACTIVE SHUTDOWN GND MIC5265 Diagram April 2005 8 M9999-041505 (408) 955-1690 Micrel, Inc. MIC5265 increases slightly with respect to bypass capacitance. A unique quick-start circuit allows the MIC5265 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Applications Information Enable/Shutdown The MIC5265 comes with an active-high enable pin that allows the regulator in each output 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. This part is CMOS and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Active Shutdown The MIC5265 also features an active shutdown clamp, which is an N-channel MOSFET that turns on when the device is disabled. This allows the output capacitor and load to discharge, de-energizing the load. No-Load Stability The MIC5265 will remain stable and in regulation with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Input Capacitor The MIC5265 is a high performance, high bandwidth device. Therefore, it requires well-bypassed input supplies 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 high-frequency noise and are good practice in any RF-based circuit. Thermal Considerations The MIC5265 is designed to provide 150mA of continuous current per output 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 2.8V, and the output current is 100mA. Output Capacitor The MIC5265 requires an output capacitor for stability. The design requires 1µF or greater on each output to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The maximum recommended ESR is 300mΩ. 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. 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 – 2.8V) x 150mA 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. PD = 0.33W 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 J (max) − T A PD(max) = ⎜⎜ θ JA ⎝ TJ(max) = 125°C, the max. junction temperature of the die θJA thermal resistance = 235°C/W 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 0.01µF 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 April 2005 ⎞ ⎟ ⎟ ⎠ 9 M9999-041505 (408) 955-1690 Micrel, Inc. MIC5265 MIC5265 Junction-To-Ambient Thermal Resistance Package θJA Recommended Minimum Footprint θJA 1” Sq. Copper Clad θJC SOT-23-5 (M5 or D5) 235°C/W 125°C 145°C/W 0.33W = 125°C − T A 235°C / W TA = 47.45°C Therefore, a 2.8V application at 150mA of output current can accept an ambient operating temperature of 47°C in a SOT-23-5 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: 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-toambient thermal resistance for the minimum footprint is 235°C/W. The maximum power dissipation must not be exceeded for proper operation. http://www.micrel.com/_PDF/other/LDOBk_ds.pdf For example, when operating the MIC5265-2.8YD5 at an input voltage of 5.0V at 150mA with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: April 2005 10 M9999-041505 (408) 955-1690 Micrel, Inc. MIC5265 Package Information Thin SOT-23-5 (M) 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, Incorporated. April 2005 11 M9999-041505 (408) 955-1690