MIC5206 150mA Low-Noise LDO Regulator General Description Features The MIC5206 is an efficient linear voltage regulator with very low dropout voltage (typically 17mV at light loads and 165mV at 150mA), and very low ground current (600µA at 100mA output), with better than 1% initial accuracy. It has a logic compatible enable/shutdown control input and an internal undervoltage monitor. • • • • • • • • • • • • Designed especially for hand-held, battery-powered devices, the MIC5206 can be switched by a CMOS or TTL compatible logic signal. When disabled, power consumption drops nearly to zero. Dropout ground current is minimized to prolong battery life. Key features include an undervoltage monitor with an error flag output, a reference bypass pin to improve its already low-noise performance (8-pin versions only), reversedbattery protection, current limiting, and overtemperature shutdown. The MIC5206 is available in several fixed voltages in a tiny SOT-23-5 package. It features a pinout, similar to the LP2980, but has significantly better performance. Fixed and adjustable output voltage versions, featuring the reference bypass option, are available in the 8-pin Micrel Mini 8™ 8-pin MSOP (micro small-outline package). For low-dropout regulators that are stable with ceramic output capacitors, see the µCap MIC5245/6/7 family. Error flag indicates undervoltage fault High output voltage accuracy Guaranteed 150mA output Ultra-low-noise output (8-pin versions) Low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Reversed-battery protection “Zero” off-mode current Logic-controlled electronic enable Applications • • • • • • • Cellular telephones Laptop, notebook, and palmtop computers Battery-powered equipment PCMCIA VCC and VPP regulation/switching Consumer/personal electronics SMPS post-regulator/dc-to-dc modules High-efficiency linear power supplies Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. Typical Application SOT-23-5 Fixed Voltage Application Adjustable Voltage Application Micrel Mini 8 is a trademark of Micrel, 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 May 2006 M9999-051506 (408) 955-1690 Micrel, Inc. MIC5206 Ordering Information Part Number Standard Marking Pb-Free Marking Voltage* Junction Temp. Range Package MIC5206-2.5BM5 LD25 MIC5206-2.5YM5 LD25 2.5V –40° to +125°C 5-Pin SOT-23 MIC5206-2.7BM5 LD27 MIC5206-2.7YM5 LD27 2.7V –40° to +125°C 5-Pin SOT-23 MIC5206-3.0BM5 LD30 MIC5206-3.0YM5 LD30 3.0V –40° to +125°C 5-Pin SOT-23 MIC5206-3.2BM5 LD32 MIC5206-3.2YM5 LD32 3.2V –40° to +125°C 5-Pin SOT-23 MIC5206-3.3BM5 LD33 MIC5206-3.3YM5 LD33 3.3V –40° to +125°C 5-Pin SOT-23 MIC5206-3.6BM5 LD36 MIC5206-3.6YM5 LD36 3.6V –40° to +125°C 5-Pin SOT-23 MIC5206-3.8BM5 LD38 MIC5206-3.8YM5 LD38 3.8V –40° to +125°C 5-Pin SOT-23 MIC5206-4.0BM5 LD40 MIC5206-4.0YM5 LD40 4.0V –40° to +125°C 5-Pin SOT-23 MIC5206-5.0BM5 LD50 MIC5206-5.0YM5 LD50 5.0V –40° to +125°C 5-Pin SOT-23 MIC5206BMM MIC5206YMM ADJ –40° to +125°C 8-Pin MSOP MIC5206-3.0BMM MIC5206-3.0YMM 3.0V –40° to +125°C 8-Pin MSOP MIC5206-3.3BMM MIC5206-3.3YMM 3.3V –40° to +125°C 8-Pin MSOP MIC5206-3.6BMM MIC5206-3.6YMM 3.6V –40° to +125°C 8-Pin MSOP MIC5206-3.8BMM MIC5206-3.8YMM 3.8V –40° to +125°C 8-Pin MSOP MIC5206-4.0BMM MIC5206-4.0YMM 4.0V –40° to +125°C 8-Pin MSOP MIC5206-5.0BMM MIC5206-5.0YMM 5.0V –40° to +125°C 8-Pin MSOP * Other voltages available. Contact Micrel for details. May 2006 2 M9999-051506 (408) 955-1690 Micrel, Inc. MIC5206 Pin Configuration MIC5206-xxBM5/YM5 (Fixed Output Voltage) MIC5206-xxBMM/YMM (Fixed Output Voltage) MIC5206-BMM/YMM (Adjustable Output Voltage) Pin Description Pin Number SOT-23-5 Pin Number MSOP-8 Pin Name Pin Function 1 8 IN Supply Input 2 4, 6 GND 3 7 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Do not leave floating. 4 3 FLAG Error Flag (Output): Open-collector output. Active low indicates an output undervoltage condition 5 (fixed) BYP Reference Bypass: Connect external 470pF capacitor to GND to reduce output noise. May be left open 5 (adj.) ADJ Adjust (Input): Adjustable regulator feedback input. Connect to resistor voltage divider. 1, 2 OUT Regulator Output 5 May 2006 Ground 3 M9999-051506 (408) 955-1690 Micrel, Inc. MIC5206 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Input Voltage (VIN).............................. –20V to +20V Enable Input Voltage (VEN)............................. –20V to +20V Power Dissipation (PD) .......................... Internally Limited (3) Junction Temperature (TJ) ........................–40°C to +125°C Lead Temperature (soldering, 5 sec)......................... 260°C Supply Input Voltage (VIN)............................. +2.5V to +16V Enable Input Voltage (VEN)..................................... 0V to VIN Junction Temperature ............................... –40°C to +125°C SOT-23-5 (θJA) (3) MSOP-8 (θJA) (3) Electrical Characteristics VIN = VOUT + 1V; IL = 100µA; CL = 1.0µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C < TJ < +125°C, unless noted. Symbol Parameter Condition VO Output Voltage Accuracy Variation from nominal VOUT Min Typ ∆VO/∆T Output Voltage Temperature Coefficient Note 4 ∆VO/VO Line Regulation VIN = VOUT + 1V to 16V ∆VO/VO Load Regulation IL = 0.1mA to 150mA, Note 5 VIN – VO Dropout Voltage, Note 6 IL = 100µA 17 IL = 50mA 110 IL = 100mA 140 IL = 150mA 165 –1 –2 Max Units 1 2 % % ppm/°C 40 50 70 150 230 250 300 275 350 mV mV mV mV mV mV mV mV IGND Quiescent Current VEN ≤ 0.4V (shutdown) VEN ≤ 0.18V (shutdown) 0.01 1 5 µA µA IGND Ground Pin Current, Note 7 VEN ≥ 2.0V, IL = 100µA 80 IL = 50mA 350 IL = 100mA 600 IL = 150mA 1300 125 150 600 800 1000 1500 1900 2500 µA µA µA µA µA µA µA µA PSRR Ripple Rejection 75 dB ILIMIT Current Limit VOUT = 0V 320 ∆VO/∆PD Thermal Regulation Note 8 0.05 %/W eno Output Noise IL = 50mA, CL = 4.7µF, 470pF from BYP to GND (MM package only) 260 nV√Hz 500 mA Enable Input VIL Enable Input Logic-Low Voltage Regulator shutdown VIH Enable Input Logic-High Voltage Regulator enable IIL Enable Input Current VIL ≤ 0.4V VIL ≤ 0.18V VIH ≥ 2.0V VIH ≥ 2.0V IIH May 2006 0.4 0.18 V 2.0 0.01 5 4 V V –1 –2 20 25 µA µA µA µA M9999-051506 (408) 955-1690 Micrel, Inc. Symbol MIC5206 Parameter Condition Min Typ Max Units –2 –6 –10 % 0.2 0.4 V 0.1 +1 µA Error Flag Output VERR Flag Threshold Undervoltage condition (below nominal) Note 9 VOL Output Logic-Low Voltage IL = 1mA, undervoltage condition IFL Flag Leakage Current Flag off, VFLAG = 0V to 16V –1 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 at 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 theMIC5205-x.xBM5 (all versions) is 220°C/W, and the MIC5206-x.xBMM (all versions) is 200°C/W, mounted on a PC board (see “Thermal Considerations” for further details). 4. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. 5. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 6. Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1Vdifferential. 7. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the load current plus the ground pin current. 8. Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 150mA load pulse at VIN = 16V for t = 10ms. 9. The error flag comparator includes 3% hysteresis. May 2006 5 M9999-051506 (408) 955-1690 Micrel, Inc. MIC5206 Typical Characteristics VIN = 6V VOUT = 5V -20 PSRR (dB) -60 -80 -100 1E+1 1k 1E+4 10k 1E+5 1M 10M 10 1E+2 100k 1E+61E+7 100 1E+3 FREQUENCY (Hz) 0 -20 PSRR (dB) PSRR (dB) -60 -80 IOUT = 10mA COUT = 1µF Power Supply Rejection Ratio -20 -60 -80 IOUT = 100mA COUT = 1µF -100 1E+11E+21E+31E+41E+51E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) May 2006 IOUT = 10mA COUT = 2.2µF CBYP = 0.01µF 10mA COUT = 1µF 10 0 100 90 80 70 60 50 40 30 20 10 0 0 -100 1E+11E+21E+31E+41E+51E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 6 0.4 1mA IOUT = 100mA 10mA COUT = 2.2µF CBYP = 0.01µF 0.1 0.2 0.3 VOLTAGE DROP (V) 0.4 1000 100 1 IOUT = 100mA COUT = 2.2µF CBYP = 0.01µF 0.1 0.2 0.3 VOLTAGE DROP (V) Turn-On Time vs. Bypass Capacitance 10 VIN = 6V VOUT = 5V -60 IOUT = 100mA 20 10 10 Power Supply Rejection Ratio -40 -80 30 10000 VIN = 6V VOUT = 5V -60 0 VIN = 6V VOUT = 5V -40 Power Supply Rejection Ratio -40 1mA 40 Power Supply Ripple Rejection vs. Voltage Drop -100 1E+11E+21E+31E+41E+51E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) PSRR (dB) PSRR (dB) -20 IOUT = 1mA COUT = 2.2µF CBYP = 0.01µF -80 -100 1E+11E+21E+31E+41E+51E+61E+7 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 0 -60 -20 PSRR (dB) PSRR (dB) -80 -40 0 VIN = 6V -20 VOUT = 5V -60 Power Supply Rejection Ratio VIN = 6V VOUT = 5V 50 0 -100 1E+1 1k 1E+4 10k 1E+5 1M 1E+7 10 1E+2 100k 1E+6 10M 100 1E+3 FREQUENCY (Hz) Power Supply Rejection Ratio -40 IOUT = 100µA COUT = 2.2µF CBYP = 0.01µF -80 IOUT = 1mA COUT = 1µF -100 1E+1 1k 1E+4 10k 1E+5 1M 10M 10 1E+2 100k 1E+61E+7 100 1E+3 FREQUENCY (Hz) 0 -60 0 VIN = 6V VOUT = 5V -40 -40 -100 1E+1 1k 1E+4 10k 1E+5 1M 1E+7 10 1E+2 100k 1E+6 10M 100 1E+3 FREQUENCY (Hz) Power Supply Rejection Ratio -20 60 VIN = 6V VOUT = 5V -80 IOUT = 100µA COUT = 1µF Power Supply Ripple Rejection vs. Voltage Drop RIPPLE REJECTION (dB) -40 Power Supply Rejection Ratio TIME (µs) -20 PSRR (dB) 0 RIPPLE REJECTION (dB) Power Supply Rejection Ratio NOISE (µV/ Hz) 0 0.1 0.01 100 1000 10000 CAPACITANCE (pF) Noise Performance 10mA, COUT = 1µF 1mA COUT = 1µF CBYP = 10nF 0.001 VOUT = 5V 0.0001 1E+11E+21E+3 10 100 1k 1E+41E+5 10k 100k 1E+61E+7 1M 10M FREQUENCY (Hz) M9999-051506 (408) 955-1690 Micrel, Inc. MIC5206 Typical Characteristics VOUT = 5V 1mA 0.001 C OUT = 10µF electrolytic 0.0001 1E+11E+2 1k 10k 1E+51E+6 10 100 1E+31E+4 100k 1M 1E+7 10M FREQUENCY (Hz) 10 NOISE (µV/ Hz) 1 0.1 Noise Performance 10mA 100mA 0.01 V 1mA = 5V OUT COUT = 10µF 0.001 electrolytic CBYP = 1nF 0.0001 1E+11E+2 1k 10k 1E+51E+6 10 100 1E+31E+4 100k 1M 1E+7 10M FREQUENCY (Hz) May 2006 0.1 100mA 10mA 0.01 VOUT = 5V COUT = 22µF 1mA 0.001 tantalum CBYP = 10nF 0.0001 1E+11E+2 1k 10k 1E+51E+6 10 100 1E+31E+4 100k 1M 1E+7 10M FREQUENCY (Hz) 10 Noise Performance 1 NOISE (µV/ Hz) 0.01 10 1 100mA 10mA Noise Performance 0.01 1mA VOUT = 5V COUT = 10µF 0.001 electrolytic 10mA CBYP = 100pF 0.0001 1E+11E+2 1k 10k 1E+51E+6 10 100 1E+31E+4 100k 1M 1E+7 10M FREQUENCY (Hz) Noise Performance 1 10mA 100mA 0.1 0.01 V 1mA = 5V OUT COUT = 10µF 0.001 electrolytic CBYP = 1nF 0.0001 1E+11E+2 1k 10k 1E+51E+6 10 100 1E+31E+4 100k 1M 1E+7 10M FREQUENCY (Hz) 7 100mA 0.1 320 DROPOUT VOLTAGE (mV) 0.1 10 NOISE (µV/ Hz) NOISE (µV/ Hz) 1 Noise Performance NOISE (µV/ Hz) 10 Dropout Voltage vs. Output Current 280 240 200 +125°C +25°C 160 120 80 –40°C 40 0 0 40 80 120 160 OUTPUT CURRENT (mA) M9999-051506 (408) 955-1690 Micrel, Inc. MIC5206 No-Load Stability The MIC5205 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Application Information Enable/Shutdown Forcing EN (enable/shutdown) high (> 2V) enables the regulator. EN is compatible with CMOS logic gates. If the enable/shutdown feature is not required, connect EN (enable) to IN (supply input). Refer to the text with Figures 1aand 2. Error Flag Output The error flag is an open-collector output and is active (low) when an undervoltage of approximately 5% below the nominal output voltage is detected. A pull-up resistor from IN to FLAG is shown in all schematics. If an error indication is not required, FLAG may be left open and the pull-up resistor may be omitted. Input Capacitor 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. Enable Pin Ramp and the Error Flag To prevent indeterminate behavior on the error flag during power down of the device, ensure that the fall time of the enable pin signal, from logic high to logic low, is faster than 100µs. Reference Bypass Capacitor BYP (reference bypass) is connected to the internal voltage reference. A 470pF capacitor (CBYP) connected from BYP to GND quiets this reference, providing a significant reduction in output noise. See Figure 2. CBYP reduces the regulator phase margin; when using CBYP, output capacitors of 2.2µF or greater are generally required to maintain stability. The start-up speed of the MIC5206 is inversely proportional to the size of the reference bypass capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of CBYP. Likewise, if rapid turn-on is necessary, consider omitting CBYP. If output noise is not a major concern, omit CBYP and leave BYP open. Fixed Regulator Applications Figure 1a. Low-Noise Fixed Voltage Application EN (pin 3) is shown connected to IN (pin 1) for an application where enable/shutdown is not required. The error flag is shown with a 100kΩ pull-up resistor. Output Capacitor An output capacitor is required between OUT and GND to prevent oscillation. The minimum size of the output capacitor is dependent upon whether a reference bypass capacitor is used. 1.0µF minimum is recommended when CBYP is not used (see Figure 2). 2.2µF minimum is recommended when CBYP is 470pF (see Figure 2). Larger values improve the regulator’s transient response. The output capacitor value may be increased without limit. The output capacitor should have an ESR (effective series resistance) of about 5Ω or less and a resonant frequency above 1MHz. 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. 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. May 2006 Figure 1b. Low-Noise Fixed Voltage Application Figure 1b is an example of a basic configuration where the lowest-noise operation is not required. COUT = 1µF minimum. The error flag is shown with a 47kΩ pull-up resistor. 8 M9999-051506 (408) 955-1690 Micrel, Inc. MIC5206 Ultra-Low-Noise Application Thermal Considerations Layout The MIC5206-x.xBM5 (5-pin SOT-23 package) has the following thermal characteristics when mounted on a single layer copper-clad printed circuit board. Multilayer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. Figure 2. Ultra-Low-Noise Fixed Voltage Application Figure 2 includes a 470pF capacitor for low-noise operation and shows EN (pin 7) connected to IN (pin 8) for an application where enable/shutdown is not required. The error flag is shown with a 47kΩ pull-up resistor. PC Board Dielectric θJA FR4 220°C/W Ceramic 200°C/W SOT-23-5 Thermal Characteristics The “worst case” value of 220°C/W assumes no ground plane, minimum trace widths, and a FR4 material board. Adjustable Regulator Applications Figure 3 shows the MIC5206BMM adjustable output voltage configuration. Two resistors set the output voltage. The formula for output voltage is: The MIC5206-xxBMM (8-pin MSOP) has a thermal resistance of 200°C/W when mounted on a FR4 board with minimum trace widths and no ground plane. ⎛ R2 ⎞ VOUT = 1.242V × ⎜ + 1⎟ R1 ⎝ ⎠ Resistor values are not critical because ADJ (adjust) has a high input impedance, but for best results use resistors of 470kΩ or less. A capacitor from ADJ to ground provides greatly improved noise performance. PC Board Dielectric θJA FR4 200°C MSOP Thermal Characteristics Nominal Power Dissipation and Die Temperature The MIC5206-x.xBM5 at a 25°C ambient temperature will operate reliably at over 450mW power dissipation when mounted in the “worst case” manner described above. At an ambient temperature of 40°C, the device may safely dissipate over 380mW. These power levels are equivalent to a die temperature of 125°C, the maximum operating junction temperature for the MIC5206. For additional heat sink characteristics, please refer to Micrel Application Hint 17, “Calculating P.C. Board Heat Sink Area For Surface Mount Packages”. Figure 3. Ultra-Low-Noise Adjustable Voltage Application Figure 3 also includes a 470pF capacitor for lowestnoise operation and shows EN (pin 7) connected to IN (pin 8) for an application where enable/shutdown is not required. COUT = 2.2µF minimum. The error flag is shown with a 47kΩ pull-up resistor. May 2006 9 M9999-051506 (408) 955-1690 Micrel, Inc. MIC5206 Package Information 5-Pin SOT-23 (M5) 8-Pin MSOP (MM) May 2006 10 M9999-051506 (408) 955-1690 Micrel, Inc. MIC5206 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. © 2000 Micrel, Incorporated. May 2006 11 M9999-051506 (408) 955-1690