MIC5211 Micrel, Inc. MIC5211 Dual µCap 80mA LDO Regulator General Description Features The MIC5211 is a dual µCap 80mA linear voltage regulator with very low dropout voltage (typically 20mV at light loads), very low ground current (225µA at 20mA output current), and better than 3% initial accuracy. This dual device comes in the miniature SOT-23-6 package, featuring independent logic control inputs. • • • • • • • • • • • • The µCap regulator design is optimized to work with low-value, low-cost ceramic capacitors. The outputs typically require only 0.1µF of output capacitance for stability. Designed especially for hand-held, battery-powered devices, ground current is minimized using Micrel’s proprietary Super ßeta PNP™ technology to prolong battery life. When disabled, power consumption drops nearly to zero. Stable with low-value ceramic or tantalum capacitors Independent logic controls Low quiescent current Low dropout voltage Mixed voltages available Tight load and line regulation Low temperature coefficient Current and thermal limiting Reversed input polarity protection Zero off-mode current Dual regulator in tiny SOT-23 package 2.5V to 16V input range Applications Key features include SOT-23-6 packaging, current limiting, overtemperature shutdown, and protection against reversed battery conditions. • • • • • • The MIC5211 is available in dual 1.8V, 2.5V, 2.7V, 2.8V, 3.0V, 3.3V, 3.6V, and 5.0V versions. Certain mixed voltages are also available. Contact Micrel for other voltages. Cellular telephones Laptop, notebook, and palmtop computers Battery-powered equipment Bar code scanners SMPS post regulator/dc-to-dc modules High-efficiency linear power supplies Typical Application VIN MIC5211 Enable Shutdown 1 2 5 Enable Shutdown 3 4 EnableA 6 VOUTA 0.1µF 0.1µF EnableB VOUTB 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 1 MIC5211 MIC5211 Micrel, Inc. Ordering Information Part Number Standard Pb-Free Part Number Mark Code MIC5211-1.8BM6 LFBB MIC5211-2.5BM6 MIC5211-2.7BM6 Full Manufacturing Mark Code Voltage Side A / Side B Temperature Range Package MIC5211-1.8YM6 LFBB 1.8V 0ºC to +125ºC SOT-23-6 LFCC Contact Factory LFCC 2.5V –40ºC to +125ºC SOT-23-6 LFDD MIC5211-2.7YM6 LFDD 2.7V –40ºC to +125ºC SOT-23-6 MIC5211-2.8BM6 LFEE MIC5211-2.8YM6 LFEE 2.8V –40ºC to +125ºC SOT-23-6 MIC5211-3.0BM6 LFGG MIC5211-3.0YM6 LFGG 3.0V –40ºC to +125ºC SOT-23-6 MIC5211-3.3BM6 LFLL MIC5211-3.3YM6 LFLL 3.3V –40ºC to +125ºC SOT-23-6 MIC5211-3.6BM6 LFQQ MIC5211-3.6YM6 LFQQ 3.6V –40ºC to +125ºC SOT-23-6 MIC5211-5.0BM6 LFXX MIC5211-5.0YM6 LFXX 5.0V –40ºC to +125ºC SOT-23-6 LFBC MIC5211-1.8/2.5YM6 MIC5211-BCYM6 LFBC 1.8V / 2.5V 0ºC to +125ºC SOT-23-6 MIC5211-1.8/3.3BM6 LFBL MIC5211-1.8/3.3YM6 MIC5211-BLYM6 LFBL 1.8V / 3.3V 0ºC to +125ºC SOT-23-6 MIC5211-2.5/3.3BM6 LFCL MIC5211-2.5/3.3YM6 MIC5211-CLYM6 LFCL 2.5V / 3.3V –40ºC to +125ºC SOT-23-6 MIC5211-3.3/5.0BM6 LFLX MIC5211-3.3/5.0YM6 MIC5211-LXYM6 LFLX 3.3V / 5.0V –40ºC to +125ºC SOT-23-6 Dual-Voltage Regulators MIC5211-1.8/2.5BM6 Other voltages available. Contact Micrel for details. Pin Configuration OUTA IN OUT B 6 Pin 1 Index 5 4 Part Identification LFxx 1 2 3 ENA GND E N B RegulatorA Voltage Code (VOUTA ) RegulatorB Voltage Code (VOU TB ) Pin Description Pin Number Pin Name 1 ENA 2 GND Ground 3 ENB Enable/Shutdown B (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. 4 OUTB MIC5211 5 IN 6 OUTA Pin Function Enable/Shutdown A (Input): CMOS compatible input. Logic high = enable, logic low or open = shutdown. Regulator Output B Supply Input Regulator Output A 2 May 2006 MIC5211 Micrel, Inc. Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Input Voltage (VIN) ..............................–20V to +20V Enable Input Voltage (VEN) ............................–20V to +20V Power Dissipation (PD) ............................. Internally Limited Storage Temperature Range .................... –60°C to +150°C Lead Temperature (soldering, 5 sec.) ........................ 260°C ESD, (Note 3) ...................................................................... Supply Input Voltage (VIN) .................................2.5V to 16V Enable Input Voltage (VEN) ..................................0V to 16V Junction Temperature (TJ) (except 1.8V).. –40°C to +125°C 1.8V only................................................... 0°C to +125°C 6-lead SOT-23-6 (θJA) ............................................. Note 4 Electrical Characteristics VIN = VOUT + 1V; IL = 1mA; CL = 0.1µF, and VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C to +125°C; for one-half of dual MIC5211; unless noted. Symbol Parameter Conditions Min VO Output Voltage Accuracy variation from nominal VOUT ΔVO/ΔT ppm/°C Output Voltage Note 5 Typical –3 –4 Max Units 3 4 % % 50 200 Temperature Coeffcient ΔVO/VO Line Regulation VIN = VOUT +1V to 16V 0.008 0.3 0.5 % % ΔVO/VO Load Regulation IL = 0.1mA to 50mA, Note 6 0.08 0.3 0.5 % % VIN – VO Dropout Voltage, Note 7 IL = 100µA 200 450 mV IQ Quiescent Current 20 IL = 20mA IGND Ground Pin Current ILIMIT Current Limit Note 8 ΔVO/ΔPD Thermal Regulation mV 250 500 mV VEN ≤ 0.4V (shutdown) 0.01 10 µA IL = 20mA (active) 225 450 750 1200 µA VOUT = 0V 140 250 mA IL = 50mA VEN ≥ 2.0V, IL = 100µA (active) 90 IL = 50mA (active) Note 9 µA 0.05 µA %/W Enable Input Enable Input Voltage Level VIL VIH IIL Enable Input Current IIH logic low (off) logic high (on) VIL ≤ 0.6V VIH ≥ 2.0V 0.6 V V 0.01 1 µA 3 50 µA 2.0 Note 1: Exceeding the absolute maximum rating may damage the device. Note 2: The device is not guareented to function outside itsperating rating. Note 3: Devices are ESD sensitive. Handling precautions recommended. Note 4: 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 is 220°C/W for the SOT-23-6 mounted on a printed circuit board. Note 5: Output voltage temperature coeffiecient is defined as the worst case voltage change divided by the total temperature range. Note 6: 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 50mA. Change in output voltage due to heating effects are covered by thermal regulation specification. Note 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 output voltages below 2.5V, dropout voltage is the input-to-output voltage differential with the minimum voltage being 2.5V. Minimum input opertating voltage is 2.5V. Note 8: Ground pin current is the quiescent current per regulator plus pass transistor base current. The total current drawn from the supply is the sum of the load current plus the ground pin current. Note 9: 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 50mA load pulse at VIN = 16V for t = 10ms. May 2006 3 MIC5211 MIC5211 Micrel, Inc. Typical Characteristics MIC5211 4 May 2006 MIC5211 May 2006 Micrel, Inc. 5 MIC5211 MIC5211 Micrel, Inc. VOUTA (50mV/div.) Crosstalk Characteristic IOUTA (50mA/div.) VOUTB (50mV/div.) IOUTB = 100µA COUTB = 0.47µF COUTA = 0.47µF TIME (25ms/div.) MIC5211 6 May 2006 MIC5211 Micrel, Inc. Applications Information PD(max) = Enable/Shutdown ENA and ENB (enable/shutdown) may be controlled separately. Forcing ENA/B high (>2V) enables the regulator. The enable inputs typically draw only 15µA. PD(max) = TJ(max) – TA θJA 125°C – 25°C 220°C/W PD(max) = 455mW While the logic threshold is TTL/CMOS compatible, ENA/B may be forced as high as 20V, independent of VIN. ENA/B may be connected to the supply if the function is not required. The MIC5211-3.0 can supply 3V to two different loads independently from the same supply voltage. If one of the regulators is supplying 50mA at 3V from an input voltage of 4V, the total power dissipation in this portion of the regulator is: PD1 = (VIN – VOUT) IOUT + VIN • IGND Input Capacitor A 0.1µF 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 when a battery is used as the input. Output Capacitor PD1 = (4V – 3V) 50mA + 4V • 0.85mA Typical PNP based regulators require an output capacitor to prevent oscillation. The MIC5211 is ultrastable, requiring only 0.1µF of output capacitance per regulator for stability. The regulator is stable with all types of capacitors, including the tiny, low-ESR ceramic chip capacitors. The output capacitor value can be increased without limit to improve transient response. PD1 = 53.4mW Up to approximately 400mW can be dissipated by the remaining regulator (455mW – 53.4mW) before reaching the thermal shutdown temperature, allowing up to 50mA of current. PD2 = (VIN – VOUT) IOUT + VIN • IGND PD2 = (4V – 3V) 50mA + 4V • 0.85mA The capacitor should have a resonant frequency above 500kHz. Ceramic capacitors work, but some dielectrics have poor temperature coefficients, which will affect the value of the output capacitor over temperature. Tantalum capacitors are much more stable over temperature, but typically are larger and more expensive. Aluminum electrolytic capacitors will also work, but they have electrolytes that freeze at about –30°C. Tantalum or ceramic capacitors are recommended for operation below –25°C. PD2 = 53.4mW The total power dissipation is: PD1 + PD2 = 53.4mW + 53.4mW PD1 + PD2 = 106.8mW Therefore, with a supply voltage of 4V, both outputs can operate safely at room temperature and full load (50mA). No-Load Stability VIN The MIC5211 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. MIC5211 Thermal Shutdown Thermal shutdown is independent on both halves of the dual MIC5211, however, an overtemperature condition in one half may affect the other half because of proximity. OUTA ENA O UTB ENB GND VOUTA VOU TB 1µF 1µF Figure 1. Thermal Conditions Circuit Thermal Considerations In many applications, the ambient temperature is much higher. By recalculating the maximum power dissipation at 70°C ambient, it can be determined if both outputs can supply full load when powered by a 4V supply. TJ(max) – TA PD(max) = θJA When designing with a dual low-dropout regulator, both sections must be considered for proper operation. The part is designed with thermal shutdown, therefore, the maximum junction temperature must not be exceeded. Since the dual regulators share the same substrate, the total power dissipation must be considered to avoid thermal shutdown. Simple thermal calculations based on the power dissipation of both regulators will allow the user to determine the conditions for proper operation. PD(max) = 125°C – 70°C 220°C/W PD(max) = 250mW The maximum power dissipation for the total regulator system can be determined using the operating temperatures and the thermal resistance of the package. In a minimum footprint configuration, the SOT-23-6 junction-to-ambient thermal resistance (θJA) is 220°C/W. Since the maximum junction temperature for this device is 125°C, at an operating temperature of 25°C the maximum power dissipation is: May 2006 IN At 70°C, the device can provide 250mW of power dissipation, suitable for the above application. When using supply voltages higher than 4V, do not exceed the maximum power dissipation for the device. If the device is operating from a 7.2V-nominal two-cell lithium-ion battery and 7 MIC5211 MIC5211 Micrel, Inc. Both regulators live off of the same input voltage, therefore the amount of output current each regulator supplies may be limited thermally. The maximum power the MIC5211 can dissipate at room temperature is 455mW, as shown in the “Thermal Considerations” section. If we assume 6V input voltage and 50mA of output current for the 3.3V section of the regulator, then the amount of output current the 5V section can provide can be calculated based on the power dissipation. both regulators are dropping the voltage to 3.0V, then output current will be limited at higher ambient temperatures. For example, at 70°C ambient the first regulator can supply 3.0V at 50mA output from a 7.2V supply; however, the second regulator will have limitations on output current to avoid thermal shutdown. The dissipation of the first regulator is: PD1 = (7.2V – 3V) 50mA + 7.2V · 0.85mA PD1 = 216mW Since maximum power dissipation for the dual regulator is 250mW at 70°C, the second regulator can only dissipate up to 34mW without going into thermal shutdown. The amount of current the second regulator can supply is: PD = (VGND – VOUT) IOUT + VGND · IGND PD(3.3V) = (6V – 3.3V) 50mA + 6V · 0.85mA PD(3.3V) = 140.1mW PD(max) = 455mW PD2(max) = 34mW (7.2V – 3V) IOUT2(max) = 34mW PD(max) – PD(3.3V) = PD(5V) IOUT2(max) = 8mA PD(5V) = 455mW – 140.1mW 4.2V • IOUT2(max) = 34mW PD(5V) = 314.9mW The second regulator can provide up to 8mA output current, suitable for the keep-alive circuitry often required in handheld applications. Based on the power dissipation allowed for the 5V section, the amount of output current it can source is easily calculated. Refer to Application Hint 17 for heat sink requirements when higher power dissipation capability is needed. Refer to Designing with Low Dropout Voltage Regulators for a more thorough discussion of regulator thermal characteristics. PD(5V) = 314.9mW 314.9mW = (6V – 5V) IMAX – 6V · IGND (IGND typically adds less than 5% to the total power dissipation and in this case can be ignored) Dual-Voltage Considerations 314.9mW = (6V – 5V) IMAX For configurations where two different voltages are needed in the system, the MIC5211 has the option of having two independent output voltages from the same input. For example, a 3.3V rail and a 5.0V rail can be supplied from the MIC5211 for systems that require both voltages. Important considerations must be taken to ensure proper functionality of the part. The input voltage must be high enough for the 5V section to operate correctly, this will ensure the 3.3V section proper operation as well. MIC5211 IMAX = 314.9mA IMAX exceeds the maximum current rating of the device. Therefore, for this condition, the MIC5211 can supply 50mA of output current from each section of the regulator. 8 May 2006 MIC5211 Micrel, Inc. Package Information SOT-23-6 (M6) 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 This 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, Inc. May 2006 9 MIC5211