MIC5225 Ultra-Low Quiescent Current 150mA µCap Low Dropout Regulator General Description Features The MIC5225 is a 150mA highly accurate, low dropout regulator with high input voltage and ultra-low ground current. This combination of high voltage and low ground current makes the MIC5225 ideal for a wide variety of applications including USB and portable electronics applications, using 1-cell, 2-cell or 3-cell Li-Ion battery inputs. A µCap LDO design, the MIC5225 is stable with either a ceramic or tantalum output capacitor. It only requires a 2.2µF capacitor for stability. Features of the MIC5225 includes enable input, thermal shutdown, current limit, reverse battery protection, and reverse leakage protection. Available in fixed and adjustable output voltage versions, the MIC5225 is offered in the IttyBitty® SOT23-5 package with a junction temperature range of –40°C to +125°C. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • • • • • • • • • • • • Wide input voltage range: 2.3V to 16V High output accuracy of ±2.0% over temperature Guaranteed 150mA output Very low ground current: 29µA Low dropout voltage of 310mV at 150mA µCap: Stable with ceramic or tantalum capacitors Excellent line and load regulation specifications Reverse battery protection Reverse leakage protection Zero shutdown current Thermal shutdown and current limit protection IttyBitty® SOT23-5 Package Applications • Cellular phones • Keep alive supply in notebook and portable computers • Battery-powered equipment • Consumer/personal electronics • High-efficiency linear power supplies • Automotive electronics _______________________________________________________________________________________________________ Typical Application MIC5225YM5 VIN 1 2 CIN = 1.0µF OFF ON 3 EN VOUT = 1.8V 5 4 R1 R2 COUT = 2.2µF ceramic IGND = 18µA 40 38 36 34 Ground Pin Current vs. Input Voltage IOUT = 1mA 32 30 IOUT = 100µA 28 26 IOUT = 10µA 24 22 Ultra-Low Current Adjustable Regulator Application 20 4 6 8 10 12 14 INPUT VOLTAGE (V) 16 IttyBitty is a registered 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 July 2008 M9999-072908-A Micrel, Inc. MIC5225 Ordering Information Part Number Marking* Voltage** Junction Temp. Range Package Lead Finish MIC5225-1.5YM5 QT15 1.5V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-1.8YM5 QT18 1.8V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-2.5YM5 QT25 2.5V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-2.7YM5 QT27 2.7V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-3.0YM5 QT30 3.0V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-3.3YM5 QT33 3.3V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-5.0YM5 QT50 5.0V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225YM5 QTAA Adj. –40° to +125°C 5-Pin SOT23 Pb-Free * Under bar symbol ( _ ) may not be to scale. ** For other voltage options available. Contact Micrel Marketing for details. Pin Configuration EN GND IN 3 2 1 4 5 NC/ADJ OUT 5-Pin SOT23 (M5) Pin Description Pin Number Pin Name Pin Function 1 IN Supply Input. 2 GND 3 EN 4 5 July 2008 NC (Fixed) ADJ (Adjust) OUT Ground. Enable (Input): Logic Low or Open = Shutdown; Logic High = Enable. No Connect. Adjust (Input): Feedback input. Connect to resistive voltage-divider network. Regulator Output. 2 M9999-072908-A Micrel, Inc. MIC5225 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) .................................. ……–20V to 18V Enable Voltage (VEN)....................................... –0.3V to 18V Power Dissipation (PD) ..............................Internally Limited Junction Temperature (TJ) ........................–40°C to +125°C Storage Temperature (Ts) .........................–65°C to +150°C ESD ........................................................................... Note 3 Supply Voltage (VIN).......................................... 2.3V to 16V Enable Voltage (VEN)............................................ 0V to 16V Junction Temperature (TJ) ........................ –40°C to +125°C Package Thermal Resistance SOT23-5 (θJA) ..................................................235°C/W Electrical Characteristics(4) TA = 25°C with VIN = VOUT + 1V; Load = 100µA; bold values indicate –40°C< TJ < +125°C, unless otherwise specified. Parameter Condition Min Typ Output Voltage Accuracy Variation from nominal VOUT –1.0 Line Regulation VIN = VOUT + 1V to 16V 0.04 Load Regulation Load = 100µA to 150mA 0.25 –2.0 Dropout Voltage Load = 100µA 50 Load = 50mA 230 Load = 150mA Units +1.0 % +2.0 % % 1 % mV 300 mV mV 310 450 1.24 1.26 Load = 100µA 29 50 µA Load = 50mA 0.5 0.9 mA Reference Voltage Ground Current Max 1.22 3 5 mA Ground Current in Shutdown Load = 150mA VEN < 0.6V; VIN = 16V 0.1 5 µA Short Circuit Current VOUT = 0V 300 500 mA Output Leakage, Load = 500Ω; VIN = -15V –0.1 µA Reverse Polarity Input Enable Input Input Low Voltage Regulator OFF 0.6 Input High Voltage Regulator ON 2.0 Enable Input Current VEN = 0.6V; Regulator OFF –1.0 V V 0.01 +1.0 µA VEN = 2.0V; Regulator ON 0.15 1.0 µA VEN = 16V; Regulator ON 0.5 2.5 µA Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 4. Specification for packaged product only. July 2008 3 M9999-072908-A Micrel, Inc. MIC5225 Typical Characteristics Power Supply Rejection Ratio 70 350 60 300 50 250 40 200 30 150 20 100 10 0 0.01 0.1 1 10 100 FREQUENCY (Hz) 1000 Output Voltage vs. Input Voltage 3.5 3.0 2.5 ILOAD = 150mA 450 400 350 300 250 200 150 100 20 40 60 80 100 120 140 160 OUTPUT CURRENT (mA) Ground Pin Current vs. Output Current ILOAD = 75mA 2000 ILOAD = 150mA 32 30 500 0.5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 INPUT VOLTAGE (V) Ground Pin Current vs. Temperature 80 0 0 700 680 75 VIN = 4V 20 40 60 80 100 120 140 160 OUTPUT CURRENT (mA) Ground Pin Current vs. Temperature 65 50 45 IOUT = 10mA 40 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Ground Pin Current vs. Input Voltage 100 90 80 2.8 2.7 520 IOUT = 75mA 500 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 2.6 IOUT = 150mA 2.5 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 2.9 70 60 Ground Pin Current vs. Input Voltage 40 38 36 34 IOUT = 150mA 2.4 IOUT = 1mA IOUT = 100µA 20 10 0 1.5 July 2008 2.0 2.5 3.0 3.5 INPUT VOLTAGE (V) 4.0 0.4 1.5 IOUT = 1mA IOUT = 75mA 2.0 2.5 3.0 3.5 INPUT VOLTAGE (V) 4 IOUT = 100µA 28 26 24 1.4 0.9 IOUT = 10µA Ground Pin Current vs. Input Voltage 32 30 1.9 30 Ground Pin Current vs. Temperature 540 3.4 IOUT = 10mA 100 200 300 400 500 OUTPUT CURRENT (µA) 3.0 2.9 580 560 55 VIN = 4V 3.2 3.1 620 600 60 22 20 0 3.5 3.4 3.3 660 640 70 VIN = 12V 28 26 24 1000 1.0 Ground Pin Current vs. Output Current 38 36 34 1500 1.5 50 IOUT = 150mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 40 2500 2.0 50 40 0 0 Dropout Voltage vs. Temperature 500 50 3000 ILOAD = 100µA Dropout Voltage vs. Output Current 4.0 22 20 4 IOUT = 10µA 6 8 10 12 14 INPUT VOLTAGE (V) 16 M9999-072908-A Micrel, Inc. MIC5225 Typical Characteristics (continued) Input Current vs. Input Voltage 120 3.05 3.04 100 3.02 3.01 60 3.00 2.99 40 250 200 150 30 0 INPUT VOLTAGE (V) 10 -40°C 20 +25°C 10 +85°C 5 0 0 2 4 6 8 10 12 14 EXTERNAL VOLTAGE (V) MIC5225 IN OUT EN GND July 2008 IOUT = 100µA 2.95 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Reverse Current (Open Input) 25 15 100 2.97 2.96 Reverse Current 30 REVERSE CURRENT (µA) 0 REVERSE CURRENT (µA) 300 2.98 VEN = 5V RLOAD 400 Short Circuit Current vs. Temperature 350 3.03 80 20 Output Voltage vs. Temperature 50 VIN = 4V 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Reverse Current (Grounded Input) 25 -40°C 20 15 +25°C 10 +85°C 5 0 0 2 4 6 8 10 12 14 EXTERNAL VOLTAGE (V) MIC5225 IN OUT Reverse Current EN GND 5 M9999-072908-A Micrel, Inc. MIC5225 Functional Diagram OUT IN EN ENABLE 1.24V VREF GND Block Diagram – Fixed Output Voltage OUT IN EN ENABLE R1 1.24V VREF ADJ R2 GND Block Diagram – Adjustable Output Voltage July 2008 6 M9999-072908-A Micrel, Inc. MIC5225 Thermal Consideration The MIC5225 is designed to provide 150mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: PD(MAX) = (TJ(MAX) – TA)/θJA TJ(MAX) is the maximum junction temperature of the die, 125°C, and TA is the ambient operating temperature. θJA is layout dependent; Table 1 shows examples of the junction-to-ambient thermal resistance for the MIC5225. Application Information Enable/Shutdown The MIC5225 comes with an active-high enable pin that allows the regulator to be disabled. Forcing the enable pin lows 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. Input Capacitor The MIC5225 has a wide input voltage capability up to 16V. The input capacitor must be rated to sustain voltages that may be used on the input. An input capacitor may be required when the device is not near the source power supply or when supplied by a battery. Small, surface mount, ceramic capacitors can be used for bypassing. Larger value may be required if the source supply has high ripple. θJA Recommended Minimum Footprint SOT-23-5 235oC/W Table 1. SOT-23-5 Thermal Resistance Output Capacitor The MIC5225 requires an output capacitor for stability. The design requires 1.0µF or greater on the 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 1.0µF ceramic output capacitor and does not improve significantly with the use of a larger capacitor. X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7R-type 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. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT)IOUT + VINIGND Substituting PD(MAX for PD and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, when operating the MIC5225-3.0BMM at 50°C with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: PD(MAX) = (125oC – 50oC)/ 235oC/W PD(MAX) = 319mW 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. Using the output voltage of 3.0V, and an output current of 150mA, the maximum input voltage can be determined. 319mW = (VIN – 3.0V)150mA + VIN × 3.0mA 319mW = VIN × 153mA – 450mW 769mW = VIN × 153mA VIN(MAX) = 5.02V Therefore, a 3.0V application at 150mA of output current can accept a maximum input voltage of 5.02V in the SOT-23-5 package. For a full discussion of heat sinking and thermal effects on the voltage regulators, refer to the Regulator Thermals section of Micrel’s Designing with Low-Dropout Voltage Regulators handbook: http://www.onfulfillment.com/estore/pdf_download.asp? s=2243381&p=18&pdf=842935-iecjdf-bicadii No-Load Stability The MIC5225 will remain stable and in regulation with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. July 2008 Package 7 M9999-072908-A Micrel, Inc. MIC5225 Adjustable Regulator Application The MIC5225YM5 can be adjusted from 1.24V to 14V by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation: VOUT = VREF(1 + (R1/R2)), Where VREF = 1.24V. Feedback resistor R2 should be no larger than 300kΩ. VIN MIC5225YM5 IN OUT EN ADJ. VOUT R1 1.0µF GND 2.0µF R2 Figure 1. Adjustable Voltage Application July 2008 8 M9999-072908-A Micrel, Inc. MIC5225 Package Information 5-Pin SOT23 (M5) 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. © 2007 Micrel, Incorporated. July 2008 9 M9999-072908-A