MIC47053 500mA Micropower ULDOTM Linear Regulator General Description Features The MIC47053 is a high-speed, adjustable output ultra-low dropout, dual NMOS ULDOTM designed to power point-ofload applications that require a low-voltage, high-current power supply. The MIC47053 can source 500mA of output current while only requiring a 1F ceramic output capacitor for stability. The MIC47053 offers 2% output voltage accuracy over temperature, low dropout voltage (49mV @ 500mA), and low ground current which makes this device ideally suited for mobile and point-of-load applications. The MIC47053 has an NMOS output stage offering very low output impedance. The NMOS output stage makes for a unique ability to respond very quickly to sudden load changes such as that required by a microprocessor, DSP or FPGA. The MIC47053 consumes little quiescent current and therefore can be used for driving the core voltages of mobile processors and post regulating a core DC/DC converter in any processor. The MIC47053 is available in the tiny 2mm x 2mm Thin DFN packages with an operating junction temperature range of 40C to 125C. Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com. Wide input voltage range - Input voltage: 1.0V to 3.6V - Bias voltage: 2.3V to 5.5V Adjustable output voltage range down to 0.4V Low dropout voltage of 49mV at 500mA Low shutdown current: 0.1A typical 2% initial output voltage accuracy over temperature High bandwidth - very fast transient response Stable with a 1F ceramic output capacitor Logic level enable input UVLO on both supply voltages Available in thermally-enhanced 2mm x 2mm Thin DFN package Junction temperature range of -40C to +125C Applications Point-of-load applications PDAs, Notebooks, and Desktops DSP, PLD, and FPGA power supply Low-voltage post regulation _________________________________________________________________________________________________________________________ Typical Application ULDO 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 August 2012 M9999-080712-C Micrel, Inc. MIC47053 Ordering Information Part Number Marking Code(1) Output Voltage Package(2,3) Lead Finish Z53 ADJ 8 pin 2mm x 2mm Thin DFN Pb-Free MIC47053YMT Notes: 1. Over bar symbol ( ) may not be to scale. 2. Thin DFN is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. 3. Thin DFN package Pin 1 identifier = . Pin Configuration 8-Pin 2mm x 2mm Thin DFN (MT) Top View Pin Description Pin Number Pin Name 1 BIAS 2 GND Pin Function Bias Supply. The bias supply is the power supply for the internal circuitry of the regulator. Ground. Ground pins and exposed pad must be connected externally. Input Supply. Drain of NMOS pass transistor which is the power input voltage for regulator. The NMOS pass transistor steps down this input voltage to create the output voltage. 3, 4 IN 5 OUT Output. Output Voltage of Regulator. 6 ADJ Adjust Input. Connect external resistor divider to program the output voltage. 7 PGOOD 8 EN EP ePad August 2012 Power Good Output. Open-drain output. Output is driven low when the output voltage is less than the power good threshold of its programmed nominal output voltage. When the output goes above the power good threshold, the open-drain output goes high-impedance, allowing it to be pulled up to a fixed voltage. Enable: TTL/CMOS compatible input. Logic high = enable, logic low = shutdown. Exposed thermal pad. Connect to the ground plane to maximize thermal performance. 2 M9999-080712-B Micrel, Inc. MIC47053 Absolute Maximum Ratings(1) Operating Ratings(2) Bias Supply Voltage (VBIAS)............................. -0.3V to +6V IN Supply Voltage (VIN) ................................... -0.3V to +4V OUT Pin Voltage (VOUT) ................................... .-0.3V to VIN ADJ Pin Voltage (VADJ)................................... .-0.3V to +6V Power Good (PGOOD) Voltage (VPGOOD)....... .-0.3V to +6V Enable Voltage (VEN)....................................... -0.3V to +6V Lead Temperature (soldering, 10s)............................ 260C Storage Temperature (TS).........................-65C to +150C ESD Rating(3) ................................................. ESD Sensitive Power Dissipation (4).............................Internally Limited IN Supply Voltage (VIN) ............ +1.0V to +3.6V (VIN < VBIAS) Bias Voltage (VBIAS)...................................... +2.3V to +5.5V Enable Voltage (VEN)........................................... 0V to VBIAS Power Good Voltage (VPGOOD) ........................... .0V to VBIAS Output Voltage Range ................. ................ 0.4V to 3.4V Junction Temperature (TJ) ........................ -40C to +125C Ambient Temperature (TA) ........................ -40C to +125C Junction Thermal Resistance 2mm x 2mm Thin DFN-8L (JA) .........................90C/W Electrical Characteristics (5) VIN = VOUT + 0.5V; VBIAS = VOUT+2.1V; COUT =1F; IOUT = 100A; TJ = 25C, bold values indicate -40C TJ +125C, unless noted. Parameter Condition Min. Typ. Max. Units 3.6 V 1.0 V Input Supply 1.0 Input Voltage Range (VIN) (6) VIN UVLO Threshold 0.7 VIN Rising VIN UVLO Hysteresis 0.81 25 mV Ground Current in Shutdown (IGND) VEN = 0V (Regulator Shutdown) 0.1 1.0 A Ground Current (IGND) IOUT = 500mA; VIN = VOUT + 0.5V 6 15 A 5.5 V 2.3 V Bias Supply 2.3 BIAS Input Voltage (VBIAS) (6) VBIAS UVLO Threshold 1.7 VBIAS Rising VBIAS UVLO Hysteresis 2.0 70 mV Dropout Voltage (VBIAS - VOUT) IOUT = 100mA IOUT = 500mA 1.3 1.4 2.1 VBIAS Supply Current (IBIAS) IOUT = 500mA; VBIAS = VOUT + 2.1V 330 500 A VBIAS Supply Current in Shutdown (IBIAS) VEN = 0V (Regulator Shutdown) 0.1 1.0 A Dropout Voltage (VIN - VOUT) IOUT = 100mA IOUT = 500mA 12 49 50 120 mV Output Voltage Accuracy IOUT = 100A 2.0 +2.0 % VBIAS Line Regulation VBIAS = VOUT + 2.1V to 5.5V 0.1 0.1 %/V V Output Voltage August 2012 3 M9999-080712-B Micrel, Inc. MIC47053 Electrical Characteristics (5) (Continued) VIN =VOUT + 0.5V; VBIAS =VOUT + 2.1V; COUT =1F; IOUT=100A; TJ=25C, bold values indicate -40C TJ 125C, unless noted. Parameter Condition Min. VIN Line Regulation VIN = VOUT + 0.5V to 3.6V 0.05 Load Regulation IOUT = 10mA to 500mA 0.5 VIN = 2.7V; VOUT = 0V 0.6 Typ. Max. Units 0.05 %/V 0.2 0.5 % 1.6 2.5 A Current Limit Short-Circuit Current Limit Enable Input 1.0 EN Logic Level High V EN Logic Level Low 0.2 V Enable Bias Current VEN = 0V (Regulator Shutdown) VEN = 1.0V (Regulator Enabled) 0 6 2 10 A Turn-On Time COUT = 1F; 90% of typical VOUT 25 500 s TJ Rising 160 C 20 C Thermal Protection Over-Temperature Shutdown Over-Temperature Shutdown Hysteresis Power Good (PGOOD) PGOOD Threshold Voltage VOUT Rising VOUT Falling 85 PGOOD Hysteresis 90.5 89.5 95 1 PGOOD Output Low Voltage IPG = 250A PGOOD Leakage Current VPG = 5.0V % % 0.02 0.1 V 1 0.01 +1 A 0.392 0.4 0.408 V Reference Voltage Feedback Reference Voltage IOUT = 100A FB Bias Current VFB = 0.8V 20 nA Output Voltage Noise f = 10Hz to 100kHz; IOUT = 500mA; COUT =1F 111 VRMS Ripple Rejection f = 10kHz; COUT = 1F, IOUT = 100mA f = 100kHz; COUT = 1F, IOUT = 100mA 47 35 dB Output Voltage Noise and Ripple Rejection 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. The maximum allowable power dissipation of any TA (ambient temperature) is PD(MAX) = (TJ(MAX) TA ) / JA. 5. Specification for packaged product only. 6. Both VIN and VBIAS UVLO thresholds must be met for the output voltage to turn-on. If either of the two input voltages is below the UVLO thresholds, the output is disabled. August 2012 4 M9999-080712-B Micrel, Inc. MIC47053 Typical Characteristics 70 70 1.20 60 60 1.00 0.80 0.60 0.40 VBIAS = 5.0V VOUT = 1.2V IOUT = 500mA 0.00 50 40 30 20 10 VBIAS = 5.0V VOUT = 1.8V 0 1 2 3 100 2.00 2.00 1.80 1.80 1.60 DROPOUT VOLTAGE (V) 2.20 IOUT = 100mA 1.40 1.20 1.00 0.80 IOUT = 500mA 0.60 VIN = 2.5V 0.40 VOUT = 1.2V 0.20 200 300 400 500 2.5 3 3.5 4 4.5 1.20 1.00 V OUT = 1.2V 0.80 0.60 0.40 VIN = 2.5V 0.20 5 5.5 -20 0 100 200 300 400 346 380 344 360 340 320 300 280 BIAS VOLTAGE (V) 5.0 5.5 100 120 V OUT = 2.0V 1.60 1.50 1.40 1.30 1.20 VOUT = 1.2V 1.10 VIN = 2.5V 1.00 IOUT = 500mA -40 -20 0 20 40 60 80 100 120 Bias Current vs. Temperature 400 VBIAS = 3.6V VIN = 1.8V VOUT = 1.2V 380 342 340 338 336 334 360 340 320 300 280 VBIAS = 3.6V VIN = 1.8V VOUT = 1.2V 260 330 240 80 TEMPERATURE (C) 332 VIN = 1.8V IOUT = 1mA 60 1.70 500 BIAS CURRENT (A ) 400 BIAS CURRENT (A) 348 40 Bias Dropout Voltage vs. Temperature Bias Current vs. Output Current 4.5 20 OUTPUT CURRENT (mA) 350 August 2012 10 0.90 0 420 4.0 20 1.80 1.40 440 3.5 IOUT = 100mA VBIAS = 3.6V VOUT = 1.2V 1.90 V OUT = 2.0V Bias Current vs. Bias Voltage 3.0 30 TEMPERATURE (C) Bias Dropout Voltage vs. Output Current BIAS VOLTAGE (V) 260 40 -40 0.00 2 50 OUTPUT CURRENT (mA) Output Voltage vs. Bias Voltage 1.60 IOUT = 500mA 0 0 4 INPUT VOLTAGE (V) DROPOUT VOLTAGE (V) 0 OUTPUT VOLTAGE (V) DROPOUT VOLTAGE (mV) 1.40 0.20 BIAS CURRENT (A) Input Droput Voltage vs.Temperature Input Dropout Voltage vs. Output Current DROPOUT VOLTAGE (mV) OUTPUT VOLTAGE (V) Output Voltage vs. Input Voltage 240 0 100 200 300 400 OUTPUT CURRENT (mA) 5 500 -40 -20 0 20 40 60 80 100 120 TEMPERATURE ( C ) M9999-080712-B Micrel, Inc. MIC47053 Typical Characteristics (Continued) Ground Current vs. Input Voltage 20 1.208 5.00 VBIAS = 5.0V VOUT = 1.2V IOUT = 500mA 10 5 4.50 OUPUT VOLTAGE (V) 15 1.206 GROUND CURRENT (A) GROUND CURRENT (A) Output Voltage vs. Output Current Ground Current vs. Temperature 4.00 3.50 3.00 VBIAS = 3.6V VIN = 1.8V 2.50 1.204 1.202 1.200 1.198 1.196 1.194 VOUT = 1.2V 2.0 2.4 2.8 3.2 3.6 -40 -20 20 40 60 80 100 0 120 Output Voltage vs. Temperature 1.75 1.70 1.65 1.60 1.55 1.50 VBIAS = 5.0V 1.24 1.70 1.65 1.60 1.55 1.50 VBIAS = 5.0V VIN = 1.8V 3 3.5 -20 INPUT VOLTAGE (V) IOUT = 100A 80 70 70 60 60 PSRR(dB) 50 VBIAS = 4.2V VIN = 1.8V 300mV VOUT = 1.2V IOUT = 500mA COUT = 1F 0.1 1 40 60 80 100 120 -40 -20 30 100 1000 0 0.01 0 20 40 60 80 100 120 TEMPERATURE (C) Output Noise 10 1 40 10 FREQUENCY(kHz) August 2012 20 50 20 10 0 NOISE (uV/Hz) 90 80 0 0.01 VBIAS = 3.6V VIN = 1.8V 1.16 Power Supply Rejection Ratio (Bias Voltage) 90 10 1.18 TEMPERATURE (C) Power Supply Ripple Rejection (Input Voltage) 40 1.20 1.14 -40 4 1.22 VOUT = 1.2V 1.40 2.5 500 1.26 1.45 VOUT = 1.2V 1.40 20 400 Current Limit vs. Temperature 1.75 30 300 Current Limit vs. Input Voltage 1.80 2 200 OUTPUT CURRENT (mA) 1.80 1.5 100 TEMPERATURE (C) 1.45 PSRR (dB) 0 INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 1.6 CURRENT LIMIT (A) CURRENT LIMIT (A) 1.2 VIN = 1.8V 1.190 2.00 0 VBIAS = 3.6V 1.192 IOUT = 500mA VBIAS = 4.2V 300mV VIN = 1.8V VOUT = 1.2V IOUT = 500mA CBIAS = 0.1F 0.1 1 10 100 FREQUENCY(kHz) 6 1000 0.1 0.01 VBIAS = 3.6V VIN = 2.1V VOUT = 1.2V IOUT = 500mA COUT = 1F NOISE (10Hz-100Khz) = 111Vrms 0.001 0.01 0.1 1 10 100 1000 FREQUENCY (kHz) M9999-080712-B Micrel, Inc. MIC47053 Functional Characteristics August 2012 7 M9999-080712-B Micrel, Inc. MIC47053 Functional Diagram MIC47053 Adjustable Output Block Diagram August 2012 8 M9999-080712-B Micrel, Inc. MIC47053 Functional Description Tantalum capacitors have a very stable dielectric (10% over their operating temperature range) and can also be used with this device. The MIC47053 is a high-speed, ultra-low dropout, NMOS ULDO designed to take advantage of point-ofload applications that use supply rails to generate a lowvoltage, high-current power supply. The MIC47053 can source 0.5A of output current while only requiring a 1F ceramic output capacitor for stability. The MIC47053 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Output Capacitor The MIC47053 requires an output capacitor of 1F or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High-ESR capacitors may cause high-frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1F ceramic output capacitor and does not improve significantly with larger capacitance. (See the Typical Characteristic section for examples of load transient response). The output capacitor type and placement criteria are the same as the input capacitor. See the "Input Capacitor" subsection for a detailed description. Bias Supply Voltage VBIAS, requiring relatively light current, provides power to the control portion of the MIC47053. Bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. Small 0.1F ceramic capacitors from VBIAS-to-ground help reduce high frequency noise from being injected into the control circuitry from the bias rail and are good design practice. Minimum Load Current The MIC47053, unlike most other regulators, does not require a minimum load to maintain output voltage regulation. Input Supply Voltage VIN provides the supply to power the LDO. The minimum input voltage is 1.0V. This allows conversion from low voltage supplies to reduce the power dissipation in the pass element. Adjustable Regulator Design The MIC47053 allows programming of the output voltage with external resistors. The R2 resistor connected between the ADJ pin and ground should not exceed 10k, as larger values can cause instability. R1 connects between the ADJ pin and the OUT pin. The resistor values are calculated as follows: Input Capacitor The MIC47053 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1F capacitor is the minimum required for stability. A 10F ceramic capacitor is recommended for most applications, especially if the LDO's headroom (VIN -VOUT) is small and/or large load transients are present. Fast load transient and low headroom requires a larger input filter capacitor to ensure that the regulator does not drop out of regulation. A 10F will better attenuate any voltage glitches from exceeding the maximum voltage rating of the part. Additional high-frequency capacitors, such as smallvalued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RFbased circuit. X7R and X5R dielectric 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 are not recommended since they 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 or a tantalum capacitor to ensure the same capacitance value over the operating temperature range. August 2012 VOUT 0.4V R1 R2 1 Where VOUT is the desired output voltage and 0.4V is the internal reference voltage. Enable/Shutdown The MIC47053 comes with a single active-high enable pin that allows the regulator 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. 9 M9999-080712-B Micrel, Inc. MIC47053 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: Power Good (PGOOD) The Power Good (PGOOD) pin is an open drain output that goes low when the output voltage (fixed version) drops below the PGOOD threshold voltage. The pull-up resistor value should be large enough to guarantee a proper "low" voltage when the PGOOD pin pulls low. The PGOOD low voltage is typically 0.1V at 250uA current. A 10k resistor or greater is recommended when pulling up to 3.3V bias. If the PGOOD function is not required, the PGOOD pin may be left unconnected. PD(MAX) TJ(MAX) = 125C, the maximum junction temperature of the die. JA thermal resistance = 90C/W. Thermal Shutdown The MIC47053 has an internal over-temperature protection feature. This feature is for protection only. The device should never be intentionally operated near this temperature as this may reduce long term reliability. The device will turn off when the over-temperature threshold is exceeded. A 20C hysteresis is built in to allow the device to cool before turning back on. Table 1 shows junction-to-ambient and junction to case thermal resistance for the MIC47053 in the thin DFN. Package Thermal Considerations The MIC47053 is designed to provide 0.5A of continuous current in a very small package. Maximum ambient operating temperature can be calculated based upon the output current and the voltage drop across the part. Given that the input voltage is 1.8V, the output voltage is 1.2V and the output current is 0.5A. The actual power dissipation of the regulator circuit can be determined using the equation: TJ(MAX) TA JA JA Recommended Minimum Footprint JC 90C/W 45C/W 8-pin 2mm x 2mm Thin DFN Table 1. 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 90C/W. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC47053-1.2YMT at an input voltage of 1.8V and a 0.5A load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: PD VIN VOUT I OUT VIN IGND VBIAS IBIAS Because this device is CMOS, the ground current is insignificant for power dissipation and can be ignored for this calculation. TA TJ(MAX) JA PD(MAX) PD 1.8V 1.2V 0.5A 0.3W TA 125C 90C/W 0.3W TA 98C Therefore, a 1.2V application with 0.5A of output current can accept an ambient operating temperature of 98C in a 2mm x 2mm thin DFN. August 2012 10 M9999-080712-B Micrel, Inc. MIC47053 Thermal Measurements Measuring the IC's case temperature is recommended to ensure it is within its operating limits. Although this might seem like a very elementary task, it is easy to get erroneous results. The most common mistake is to use the standard thermal couple that comes with a thermal meter. This thermal couple wire gauge is large, typically 22 gauge, and behaves like a heatsink, resulting in a lower case measurement. Two methods of temperature measurement are using a smaller thermal couple wire or an infrared thermometer. If a thermal couple wire is used, it must be constructed of 36 gauge wire or higher (smaller wire size) to minimize the wire heat-sinking effect. In addition, the thermal couple tip must be covered in either thermal grease or thermal glue to make sure that the thermal couple junction is making good contact with the case of the IC. Omega brand thermal couple (5SCTT-K-36-36) is adequate for most applications. Wherever possible, an infrared thermometer is recommended. The measurement spot size of most infrared thermometers is too large for an accurate reading on a small form factor ICs. However, a IR thermometer from Optris has a 1mm spot size, which makes it a good choice for the 2mm x 2mm Thin DFN package. An optional stand makes it easy to hold the beam on the IC for long periods of time. For a full discussion of heat sinking and thermal effects of 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: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf August 2012 11 M9999-080712-B Micrel, Inc. MIC47053 Typical Application Schematic MIC47053 Adjustable Output MIC47053 Bill of Materials Item C1 C2 C3 R1 R2 Part Number GRM21BR60J106ME19 Manufacturer Murata (1) Description Ceramic Capacitor, 10F, 6.3V, X5R, Size 0603 C1608X5R0J106MT TDK(2) Ceramic Capacitor, 10F, 6.3V, X5R, Size 0603 06035D104MAT2A AVX(3) Ceramic Capacitor, 0.1F, 50V, X5R, Size 0603 GRM155R61A105KE15D C1005X5R0J105KT Murata TDK (1) Ceramic Capacitor, 1F, 10V, X5R, Size 0603 (2) Ceramic Capacitor, 1F, 10V, X5R, Size 0603 Qty. 1 1 1 CRCW060310K0FKEYE3 Vishay Dale(4) Resistor, 10k,1/16W, 1%, Size 0603 1 CRCW06034K99FKEYE3 Vishay Dale (4) Resistor, 4.99k, 1/16W, 1%, Size 0603 1 (4) Resistor, 20k, 1/16W, 1%, Size 0603 2 Low Input and Output 500mA ULDOTM Adjustable Output 1 R3, R4 CRCW060320K0FKEYE3 Vishay Dale U1 MIC47053YMT Micrel, Inc.(5) Notes: 1. Murata: www.murata.com 2. TDK: www.tdk.com 3. AVX: www.avx.com 4. Vishay: www.vishay.com 5. Micrel, Inc.: www.micrel.com August 2012 12 M9999-080712-B Micrel, Inc. MIC47053 PCB Layout Recommendations Top Layer Bottom Layer August 2012 13 M9999-080712-B Micrel, Inc. MIC47053 Package Information 8-Pin 2mm x 2mm Thin DFN (MT) 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 Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel's terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. 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) 2012 Micrel, Incorporated. August 2012 14 M9999-080712-B Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Micrel: MIC47053YMT T5 MIC47053YMT TR MIC47053YMT-T5 MIC47053YMT-TR