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| MIC5225 Ultra-Low Quiescent Current 150mA Cap Low Dropout Regulator General Description 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 Cap LDO design, the MIC5225 is stable with either a ceramic or tantalum output capacitor. It only requires a 2.2F 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(R) SOT23-5 package with a junction temperature range of -40C to +125C. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com. Features * * * * * * * * * * * * Wide input voltage range: 2.3V to 16V High output accuracy of 2.0% over temperature Guaranteed 150mA output Very low ground current: 29A Low dropout voltage of 310mV at 150mA Cap: 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(R) 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 1 2 5 VIN CIN = 1.0F OFF ON EN VOUT = 1.8V R1 R2 COUT = 2.2F ceramic IGND = 18A 40 38 36 34 32 30 28 26 24 22 Ground Pin Current vs. Input Voltage 3 4 IOUT = 1mA IOUT = 100A IOUT = 10A 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 MIC5225-1.5YM5 MIC5225-1.8YM5 MIC5225-2.5YM5 MIC5225-2.7YM5 MIC5225-3.0YM5 MIC5225-3.3YM5 MIC5225-5.0YM5 MIC5225YM5 Marking* QT15 QT18 QT25 QT27 QT30 QT33 QT50 QTAA Voltage** 1.5V 1.8V 2.5V 2.7V 3.0V 3.3V 5.0V Adj. Junction Temp. Range -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C Package 5-Pin SOT23 5-Pin SOT23 5-Pin SOT23 5-Pin SOT23 5-Pin SOT23 5-Pin SOT23 5-Pin SOT23 5-Pin SOT23 Lead Finish Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free 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 1 2 3 4 5 Pin Name IN GND EN NC (Fixed) ADJ (Adjust) OUT Pin Function Supply Input. 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. July 2008 2 M9999-072908-A Micrel, Inc. MIC5225 Absolute Maximum Ratings(1) Supply Voltage (VIN) .................................. ......-20V to 18V Enable Voltage (VEN)....................................... -0.3V to 18V Power Dissipation (PD) ..............................Internally Limited Junction Temperature (TJ) ........................-40C to +125C Storage Temperature (Ts) .........................-65C to +150C ESD ........................................................................... Note 3 Operating Ratings(2) Supply Voltage (VIN).......................................... 2.3V to 16V Enable Voltage (VEN)............................................ 0V to 16V Junction Temperature (TJ) ........................ -40C to +125C Package Thermal Resistance SOT23-5 (JA) ..................................................235C/W Electrical Characteristics(4) TA = 25C with VIN = VOUT + 1V; Load = 100A; bold values indicate -40C< TJ < +125C, unless otherwise specified. Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage Reference Voltage Load = 100A Ground Current Ground Current in Shutdown Short Circuit Current Output Leakage, Reverse Polarity Input Enable Input Input Low Voltage Input High Voltage Enable Input Current Regulator OFF Regulator ON VEN = 0.6V; Regulator OFF VEN = 2.0V; Regulator ON VEN = 16V; Regulator ON 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, 1.5k in series with 100pF. 4. Specification for packaged product only. Condition Variation from nominal VOUT VIN = VOUT + 1V to 16V Load = 100A to 150mA Load = 100A Load = 50mA Load = 150mA Min -1.0 -2.0 Typ Max +1.0 +2.0 Units % % % % mV mV mV A mA mA A mA A 0.04 0.25 50 230 310 1.22 1.24 29 0.5 3 0.1 300 -0.1 300 450 1.26 50 0.9 5 5 500 1 Load = 50mA Load = 150mA VEN < 0.6V; VIN = 16V VOUT = 0V Load = 500; VIN = -15V 0.6 2.0 -1.0 0.01 0.15 0.5 +1.0 1.0 2.5 V V A A A July 2008 3 M9999-072908-A Micrel, Inc. MIC5225 Typical Characteristics 70 60 50 40 30 20 10 0 0.01 ILOAD = 150mA 0.1 1 10 100 FREQUENCY (Hz) 1000 Power Supply Rejection Ratio 350 300 250 200 150 100 50 0 0 Dropout Voltage vs. Output Current 500 450 400 350 300 250 200 150 100 Dropout Voltage vs. Temperature 20 40 60 80 100 120 140 160 OUTPUT CURRENT (mA) 50 IOUT = 150mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 Output Voltage vs. Input Voltage ILOAD = 100A ILOAD = 75mA 3000 2500 2000 1500 Ground Pin Current vs. Output Current 40 38 36 34 32 30 28 26 24 Ground Pin Current vs. Output Current VIN = 12V VIN = 4V ILOAD = 150mA 1000 500 0 0 VIN = 4V 20 40 60 80 100 120 140 160 OUTPUT CURRENT (mA) 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 INPUT VOLTAGE (V) 22 20 0 100 200 300 400 500 OUTPUT CURRENT (A) 80 75 70 65 60 55 50 45 Ground Pin Current vs. Temperature 700 680 660 640 620 600 580 560 540 Ground Pin Current vs. Temperature 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 Ground Pin Current vs. Temperature IOUT = 10mA 40 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 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) 100 90 80 70 60 50 40 30 20 10 0 1.5 Ground Pin Current vs. Input Voltage IOUT = 10mA 3.4 2.9 2.4 Ground Pin Current vs. Input Voltage IOUT = 150mA 40 38 36 34 32 30 28 26 24 22 20 4 Ground Pin Current vs. Input Voltage IOUT = 1mA IOUT = 100A IOUT = 10A IOUT = 1mA 1.9 IOUT = 100A 1.4 0.9 4.0 0.4 1.5 IOUT = 75mA 2.0 2.5 3.0 3.5 INPUT VOLTAGE (V) 4.0 IOUT = 10A 2.0 2.5 3.0 3.5 INPUT VOLTAGE (V) 6 8 10 12 14 INPUT VOLTAGE (V) 16 July 2008 4 M9999-072908-A Micrel, Inc. MIC5225 Typical Characteristics (continued) 120 100 80 60 40 20 0 VEN = 5V RLOAD 0 INPUT VOLTAGE (V) 10 Input Current vs. Input Voltage 3.05 3.04 3.03 3.02 3.01 3.00 2.99 2.98 2.97 2.96 Output Voltage vs. Temperature 400 350 300 250 200 150 100 50 Short Circuit Current vs. Temperature IOUT = 100A 2.95 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) VIN = 4V 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 30 REVERSE CURRENT (A) 25 20 15 10 Reverse Current (Open Input) REVERSE CURRENT (A) 30 25 20 15 10 Reverse Current (Grounded Input) -40C -40C +25C +85C +25C +85C 5 0 0 2 4 6 8 10 12 14 EXTERNAL VOLTAGE (V) 5 0 0 2 4 6 8 10 12 14 EXTERNAL VOLTAGE (V) MIC5225 IN OUT EN GND Reverse Current MIC5225 IN OUT EN GND Reverse Current July 2008 5 M9999-072908-A Micrel, Inc. MIC5225 Functional Diagram IN EN ENABLE OUT 1.24V VREF GND Block Diagram - Fixed Output Voltage IN EN ENABLE R1 1.24V OUT 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)/JA TJ(MAX) is the maximum junction temperature of the die, 125C, and TA is the ambient operating temperature. JA is layout dependent; Table 1 shows examples of the junction-to-ambient thermal resistance for the MIC5225. Package SOT-23-5 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. Output Capacitor The MIC5225 requires an output capacitor for stability. The design requires 1.0F 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 300m. The output capacitor can be increased, but performance has been optimized for a 1.0F 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. 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. JA Recommended Minimum Footprint 235oC/W Table 1. SOT-23-5 Thermal Resistance 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 50C 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 235C/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 x 3.0mA 319mW = VIN x 153mA - 450mW 769mW = VIN x 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 July 2008 7 M9999-072908-A Micrel, Inc. 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 300k. VIN MIC5225YM5 IN EN OUT R1 1.0F GND ADJ. R2 MIC5225 VOUT 2.0F 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. (c) 2007 Micrel, Incorporated. July 2008 9 M9999-072908-A |
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