MIC23603 4MHz PWM 6A Buck Regulator with HyperLight Load(R) Revision 1.1 General Description Features The MIC23603 is a high-efficiency 4MHz 6A synchronous (R) buck regulator with HyperLight Load mode. HyperLight Load provides very high efficiency at light loads and ultrafast transient response which is perfectly suited for supplying processor core voltages. An additional benefit of this proprietary architecture is very low output ripple voltage throughout the entire load range with the use of small output capacitors. The tiny 4mm x 5mm DFN package saves precious board space and requires few external components. The MIC23603 is designed for use with a very small inductor, down to 0.33H, and an output capacitor as small as 47F that enables a sub-1mm height. The MIC23603 has a very low quiescent current of 24A and achieves as high as 81% efficiency at 1mA. At higher loads, the MIC23603 provides a constant switching frequency around 4MHz while achieving peak efficiencies up to 93%. The MIC23603 is available in 20-pin 4mm x 5mm DFN package with an operating junction temperature range from -40C to +125C. Datasheets and support documentation are available on Micrel's web site at: www.micrel.com. * * * * * * * * * * * * * * * Input voltage: 2.7V to 5.5V 6A output current Up to 93% efficiency and 81% at 1mA 24A typical quiescent current 4MHz PWM operation in continuous mode Ultra-fast transient response Power Good Programmable soft-start Low voltage output ripple - 14mVpp ripple in HyperLight Load mode - 5mV output voltage ripple in full PWM mode Fully integrated MOSFET switches 0.01A shutdown current Thermal shutdown and current limit protection Output voltage as low as 0.65V 20-pin 4mm x 5mm DFN -40C to +125C junction temperature range Applications * 5V POL supplies * C/P, FPGA and DSP power * Test and measurement systems * Barcode readers * Set-top box, Modems, and DTV * Distributed power systems * Networking systems ____________________________________________________________________________________________________________ Typical Application HyperLight Load 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 November 5, 2013 Revision 1.1 Micrel Inc. MIC23603 Ordering Information Part Number Nominal Output Voltage Junction Temp. Range MIC23603YML ADJ -40C to +125C Package (1) 20-pin 4mm x 5mm DFN Lead Finish Pb-Free Notes: 1. DFN is GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration 20-Pin 4mm x 5mm DFN (ML) (Top View) Pin Description Pin Number Pin Name 1, 2, 9-12, 19, 20 SW Pin Function 3, 13, 14, 18 PVIN 4 PG Power good. Connect an external resistor to a voltage source to supply a power good indicator. 5 EN Enable input. Logic high enables operation of the regulator. Logic low shuts down the device. Do not leave floating. 6 SNS Sense input. Connect to VOUT as close to output capacitor as possible to sense output voltage. 7 FB Feedback input. Connect an external divider between VOUT and ground to program the output voltage. 8,16 AGND Analog ground. Connect to central ground point where all high current paths meet (CIN, COUT, PGND) for best operation. 15 SS Soft Start. Place a capacitor from this pin to ground to program the soft start time. Do not leave floating, 2.2nF minimum CSS is required. Switch output. Internal power MOSFET output switches. Input voltage. Connect a capacitor to ground to decouple the noise. 17 AVIN Supply voltage. Analog control circuitry. Connect to VIN through a 10 resistor. EP PGND Power Ground. November 5, 2013 2 Revision 1.1 Micrel Inc. MIC23603 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) ......................................................... 6V Sense (VSNS)..................................................................... 6V Output Switch Voltage .................................................. 6V Enable Input Voltage (VEN) ................................ -0.3V to VIN Storage Temperature Range .................... -65C to +150C (3) ESD Rating ............................................. ESD SENSITIVE Supply Voltage (VIN) ......................................... 2.7V to 5.5V Enable Input Voltage (VEN) .................................... 0V to VIN Output Voltage Range (VSNS) ........................ 0.65V to 3.6V Junction Temperature Range (TJ)...... - 40C TJ +125C Thermal Resistance 4mm x 5mm DFN-20 (JA) .............................. 44.1C/W Electrical Characteristics(4) TA = 25C; VIN = VEN = 3.6V; VOUT = 1.8V; L = 0.33H; COUT = 47F x 2 unless otherwise specified. Bold values indicate -40C TJ +125C, unless noted. Parameter Condition Min Undervoltage Lockout Threshold 2.2 Turn-on Undervoltage Lockout Hysteresis IOUT = 0mA , SNS > 1.2 x VOUT Nominal Shutdown Current VEN = 0V, VIN = 5.5V Feedback Voltage Current Limit SNS = 0.9 x VOUTNOM Output Voltage Line Regulation VIN = 3.6V to 5.5V if VOUTNOM < 2.5V, ILOAD = 20mA Units 5.5 V 2.8 V 45 A 0.01 5 A 0.605 0.62 0.636 V 6.5 12 16 A 20mA < ILOAD < 500mA, VIN = 3.6V if VOUTNOM < 2.5V 20mA < ILOAD < 500mA, VIN = 5.0V if VOUTNOM 2.5V 20mA < ILOAD < 1A, VIN = 3.6V if VOUTNOM < 2.5V 20mA < ILOAD < 1A, VIN = 5.0V if VOUTNOM 2.5V 0.3 %/V 0.3 % 0.7 % ISW = 1000mA PMOS 0.03 ISW = -1000mA NMOS 0.025 Maximum Frequency IOUT = 300mA Soft Start Time VOUT = 90%, CSS = 2.2nF Power Good Threshold % of VNOMINAL mV 24 VIN = 4.5V to 5.5V if VOUTNOM 2.5V, ILOAD = 20mA PWM Switch ON-Resistance 2.5 Max 270 Quiescent Current Output Voltage Load Regulation Typ 2.7 Supply Voltage Range 4 MHz 1200 s 85 90 Power Good Hysteresis 95 % 20 Power Good Pull Down VSNS = 90% VNOMINAL, IPG = 1mA Enable Threshold Turn-On % 200 mV 0.8 1.2 V Enable Input Current 0.1 2 A Overtemperature Shutdown 160 C Overtemperature Shutdown Hysteresis 20 C 0.4 Notes: 1. Exceeding the absolute maximum rating can damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5k in series with 100pF. 4. Specification for packaged product only. November 5, 2013 3 Revision 1.1 Micrel Inc. MIC23603 Typical Characteristics Efficiency vs. Output Current VOUT = 3.3V 60 50 40 30 VIN = 5V L = 0.33H COUT = 2x47F 20 10 0 0.0001 0.001 0.01 0.1 1 100 90 90 80 80 70 50 VIN = 2.9V 40 30 L = 0.33H COU T= 2x47F 20 10 0 0.0001 10 0.001 0.01 0.1 1 70 60 VIN = 3.6V 50 30 20 L = 0.33H COUT = 2x47F 10 0 0.0001 10 1 Output Voltage vs. Input Voltage Output Voltage vs. Input Voltage Output Voltage vs. Output Current (HLL) 1.215 1.210 LOAD = 4A 1.205 LOAD = 1.5A 1.200 L = 0.33H COUT = 2x47F 1.195 3 3.5 4 4.5 5 1.210 LOAD = 100mA 1.205 1.200 LOAD = 10mA 1.195 1.190 5.5 L = 0.33H COUT = 2x47F 2.5 3 1.00 1.215 0.95 ENABLE THRESHOLD (V) 1.220 1.210 1.205 1.200 1.195 1.190 VIN = 3.6V L = 0.33H COUT = 2x47F 2 2.5 3 3.5 4 4.5 OUTPUT CURRENT (A) November 5, 2013 4 4.5 5 1.205 1.200 VIN = 3.6V L = 0.33H COUT = 2x47F 1.195 1.190 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 5.5 5 OUTPUT CURRENT (A) Enable Thresholds vs. Temperature Enable Thresholds vs. Input Voltage Output Voltage vs. Output Current (CCM) 1.5 3.5 5.5 1.00 ENABLE ON 0.90 0.85 0.80 ENABLE OFF 0.75 0.70 VOUT = 1.2V LOAD = 150mA 0.65 6 0.60 10 1.210 INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1.185 OUTPUT VOLTAGE (V) 1.215 1 0.1 OUTPUT CURRENT (A) 1.215 0.5 0.01 OUTPUT CURRENT (A) 1.220 1.180 0.001 OUTPUT CURRENT (A) 1.220 2.5 VIN = 5V VIN = 2.9V 40 1.220 1.190 OUTPUT VOLTAGE (V) VIN = 5V VIN = 3.6V 60 ENABLE THRESHOLD (V) OUTPUT VOLTAGE (V) EFFICIENCY (%) VOUT = 2.5V 70 OUTPUT VOLTAGE (V) EFFICIENCY (%) 80 100 EFFICIENCY (%) 100 90 Efficiency vs. Output Current VOUT = 1.2V Efficiency vs. Output Current VOUT = 1.8V 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) 4 5.0 5.5 0.95 0.90 TURN ON 0.85 0.80 0.75 0.70 0.65 0.60 VIN = 3.6V VOUT = 1.2V LOAD = 150mA -40 -20 0 TURN OFF 20 40 60 80 100 120 TEMPERATURE (C) Revision 1.1 Micrel Inc. MIC23603 Typical Characteristics (Continued) PG RISING 40 2.50 PGOOD THRESHOLDS (%) UVLO ON 35 PG DELAY (s) UVLO (V) 95 45 2.60 2.40 UVLO OFF 2.30 2.20 30 25 20 PG FALLING 15 10 2.10 2.00 PGOOD Thresholds vs. Input Voltage PGOOD Delay Time vs. Input Voltage Undervoltage Lockout vs. Temperature VOUT = 1.2V 5 -40 -20 0 20 40 60 80 100 0 120 2.5 3 3.5 4 4.5 5 85 80 75 PG FALLING 70 65 5.5 PG RISING 90 VOUT = 1.2V 2.5 3 3.5 4 4.5 5 TEMPERATURE (C) INPUT VOLTAGE (V) INPUT VOLTAGE (V) VOUT Rise Time vs. CSS Output Voltage vs. Temperature Feedback Voltage vs. Temperature 1.210 1000000 5.5 0.65 OUTPUT VOLTAGE (V) RISE TIME (s) 100000 10000 1000 100 10 10000 100000 1.206 1.204 1.202 1.200 1.198 1.196 VIN = 3.6 V LOAD = 20mA 1.194 1.192 VIN = 3.6V 1 1000 FEEDBACK VOLTAGE (V) 1.208 1000000 1.190 -40 -20 0 20 40 60 80 100 CSS (pF) TEMPERATURE (C) Quiscent Current vs. Input Voltage Switching Frequency vs. Load Current 120 20 19 18 VOUT = 1.8V L = 0.33H COUT = 2x47F 17 16 15 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) November 5, 2013 5.0 100 VIN = 3.6V 10 0.1 0.0001 VOUT = 1.2V -40 -20 0 20 40 60 80 100 120 12 VIN = 2.9V 1 5.5 0.60 Current Limit vs. Input Voltage CURRENT LIMIT (A) FREQUENCY (kHz) QUIESCENT (A) 21 0.61 13 1000 22 0.62 TEMPERATURE (C) 24 23 0.63 0.59 10000 25 0.64 VIN=5V 0.001 0.01 VOUT = 1.8V L = 0.33H COUT = 2x47F 0.1 LOAD CURRENT (A) 5 1 11 10 9 8 VOUT = 1.8V 7 10 6 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) Revision 1.1 Micrel Inc. MIC23603 Typical Characteristics (Continued) Maximum Output Current vs. Ambient Temperature MAX OUPUT CURRENT (A) 6.50 6.00 5.50 5.00 4.50 4.00 3.50 20 40 60 80 100 120 140 AMBIENT TEMPERATURE (C) November 5, 2013 6 Revision 1.1 Micrel Inc. MIC23603 Functional Characteristics November 5, 2013 7 Revision 1.1 Micrel Inc. MIC23603 Functional Characteristics (Continued) November 5, 2013 8 Revision 1.1 Micrel Inc. MIC23603 Functional Characteristics (Continued) November 5, 2013 9 Revision 1.1 Micrel Inc. MIC23603 Functional Diagram Figure 1. Simplified MIC23603 Functional Block Diagram November 5, 2013 10 Revision 1.1 Micrel Inc. MIC23603 Functional Description AGND The analog ground (AGND) is the ground path for the biasing and control circuitry. The current loop for the signal ground should be separate from the power ground (PGND) loop. See PCB Layout Recommendations for details. Placing a 3 resistor between AGND and PGND reduces ground noise. PVIN The input supply (PVIN) provides power to the internal MOSFETs for the switch mode regulator and the driver circuitry. The PVIN operating range is 2.7V to 5.5V, so an input capacitor, with a minimum voltage rating of 6.3V, is recommended. Because of the high switching speed, a minimum 10F bypass capacitor placed close to VIN and the power ground (PGND) pin is required. See the PCB Layout Recommendations for details. PGND The power ground pin is the ground path for the high current in PWM mode. The current loop for the power ground should be as small as possible and separate from the analog ground (AGND) loop as applicable. See PCB Layout Recommendations for details. AVIN Analog VIN (AVIN) provides power to the internal control and analog circuitry. AVIN and PVIN must be tied together. A 10 resistor is recommended to minimize noise coupling from PVIN. Consider the layout carefully to reduce high frequency switching noise caused by VIN before reaching AVIN. Micrel recommends placing a 1F capacitor as close to AVIN as possible. See PCB Layout Recommendations for details. SS The soft start (SS) pin is used to control the output voltage ramp up time. The approximate equation for the 3 ramp time in seconds is 250x10 x ln(10) x CSS. For example, for CSS = 2.2nF, Trise ~ 1.26ms. See the Typical Characteristics curve for a graphical guide. The minimum recommended value for CSS is 2.2nF. EN A logic high signal on the enable pin activates the device's output voltage. A logic low signal on the enable pin deactivates the output and reduces supply current to 0.01A. The MIC23603 features built-in soft-start circuitry that reduces inrush current and prevents the output voltage from overshooting at start-up. Do not leave EN floating. FB The feedback (FB) pin is provided for the adjustable voltage option (no internal connection for fixed options). This is the control input for programming the output voltage. A resistor divider network is connected to this pin from the output and is compared to the internal 0.62V reference within the regulation loop. Use Equation 1 to program the output voltage between 0.65V and 3.6V: SW The switch (SW) connects directly to one end of the inductor and provides the current path during switching cycles. The other end of the inductor is connected to the load, SNS pin, and output capacitor. Because of the high speed switching on this pin, route the switch node away from sensitive nodes whenever possible. R3 VOUT = VREF x 1 + R4 where: R3 is the top resistor, R4 is the bottom resistor. SNS The sense (SNS) pin is connected to the device's output to provide feedback to the control circuitry. Place the SNS connection close to the output capacitor. See PCB Layout Recommendations for details. PG The power good (PG) pin is an open-drain output that indicates logic high when the output voltage is typically above 90% of its steady state voltage. A pull-up resistor of more than 5k should be connected from PG to VOUT. November 5, 2013 Eq. 1 VOUT R3 R4 1.2V 274k 294k 1.5V 316k 221k 1.8V 560k 294k 2.5V 324k 107k 3.3V 464k 107k Table 1. Example Feedback Resistor Values 11 Revision 1.1 Micrel Inc. MIC23603 Application Information either for a 40C temperature rise or a 10% to 20% loss in inductance. Make sure that the inductor selected can handle the maximum operating current. When saturation current is specified, make sure that there is enough margin so that the peak current does not cause the inductor to saturate. Peak current can be calculated as follows: The MIC23603 is a high-performance DC/DC step down regulator offering a small solution size. Because it supports an output current up to 6A inside a tiny 4mm x 5mm DFN package and requires only three external components, the MIC23603 meets today's miniature portable electronic device needs. Using the HyperLight Load switching scheme, the MIC23603 maintains high efficiency throughout the entire load range while providing ultra-fast load transient response. The following sections provide additional device application information. 1 - VOUT /VIN IPEAK = IOUT + VOUT 2x f xL Compensation The MIC23603 is designed to be stable with a 0.33H to 1H inductor with a minimum of 47F ceramic (X5R) output capacitor. A feedforward capacitor (CFF) in the range of 33pF to 68pF is recommended across the top feedback resistor to reduce the effects of parasitic capacitance and improve transient performance. Output Capacitor The MIC23603 was designed for use with a 47F or greater ceramic output capacitor. Increasing the output capacitance lowers output ripple and improves load transient response, but could increase solution size or cost. A low equivalent series resistance (ESR) ceramic output capacitor such as the TDK C3216X6S1A476M, size 1206, 47F ceramic capacitor is recommended based upon performance, size and cost. Both the X7R or X5R temperature rating capacitors are recommended. The Y5V and Z5U temperature rating capacitors are not recommended because of their wide variation in capacitance over temperature and increased resistance at high frequencies. Duty Cycle The typical maximum duty cycle of the MIC23603 is 80%. Efficiency Considerations Efficiency is defined as the amount of useful output power, divided by the amount of power supplied. V xI Efficiency % = OUT OUT VIN x IIN Inductor Selection When selecting an inductor, consider the following factors (not necessarily in order of importance): Inductance * Rated current value * Size requirements x 100 Eq. 3 Maintaining high efficiency serves two purposes. It reduces power dissipation in the power supply, reducing the need for heat sinks and thermal design considerations, and it reduces current consumption for battery powered applications. Reduced current draw from a battery increases the device's operating time and is critical in hand-held devices. There are two types of losses in switching converters: DC losses and switching losses. DC losses are simply 2 the power dissipation of I R. Power is dissipated in the high side switch during the on cycle. Power loss is equal to the high side MOSFET RDSON multiplied by the Switch Current squared. During the off cycle, the low side N-channel MOSFET conducts, also dissipating power. * DC resistance (DCR) The MIC23603 was designed for use with a 0.33H to 1H inductor. For faster transient response, a 0.33H inductor yields the best result. For lower output ripple, a 1H inductor is recommended. Maximum current ratings of the inductor are generally given in two methods: permissible DC current and saturation current. Permissible DC current can be rated November 5, 2013 Eq. 2 As Equation 2 shows, the peak inductor current is inversely proportional to the switching frequency and the inductance; the lower the switching frequency or the inductance, the higher the peak current. As input voltage increases, the peak current also increases. The size of the inductor depends on the requirements of the application. Refer to the Typical Application Schematic and Bill of Materials for details. DC resistance (DCR) is also important. While DCR is inversely proportional to size, it can represent a significant efficiency loss. See Efficiency Considerations. Input Capacitor Place a 10F ceramic capacitor or greater close to the VIN pin and PGND/GND pin for bypassing. Micrel recommends the TDK C1608X5R0J106K, size 0603, 10F ceramic capacitor based upon performance, size, and cost. An X5R or X7R temperature rating is recommended for the input capacitor. Y5V temperature rating capacitors, aside from losing most of their capacitance over temperature, can also become resistive at high frequencies. This reduces their ability to filter out high frequency noise. * 12 Revision 1.1 Micrel Inc. MIC23603 Device operating current also reduces efficiency. The product of the quiescent (operating) current and the supply voltage represents another DC loss. The current needed to drive the gates on and off at a constant 4MHz frequency and the switching transitions make up the switching losses. voltage falls below the regulation threshold, the error comparator begins a switching cycle that turns the PMOS on and keeps it on for the duration of the minimum-on-time. This increases the output voltage. If the output voltage is over the regulation threshold, then the error comparator turns the PMOS off for a minimumoff-time until the output drops below the threshold. The NMOS acts as an ideal rectifier that conducts when the PMOS is off. Using an NMOS switch instead of a diode allows for lower voltage drop across the switching device when it is on. The asynchronous switching combination between the PMOS and the NMOS allows the control loop to work in discontinuous mode for light load operations. In discontinuous mode, the MIC23603 works in pulse frequency modulation (PFM) to regulate the output. As the output current increases, the off-time decreases, which provides more energy to the output. This switching scheme improves the efficiency of MIC23603 during light load currents by switching only when needed. As the load current increases, the MIC23603 goes into continuous conduction mode (CCM) and switches at a frequency centered at 4MHz. The load when the MIC23603 goes into continuous conduction mode may be approximated by the following formula: Efficiency vs. Output Current VOUT = 2.5V 100 90 EFFICIENCY (%) 80 70 60 50 40 30 VIN = 5V L = 0.33H COUT = 2x47F 20 10 0 0.0001 0.001 0.01 0.1 1 10 OUTPUT CURRENT (A) Figure 2. Efficiency Under Load Figure 2 shows an efficiency curve, from no load to 300mA. Efficiency losses are dominated by quiescent current losses, gate drive, and transition losses. By using the HyperLight Load mode, the MIC23603 can maintain high efficiency at low output currents. Over 300mA, efficiency loss is dominated by MOSFET RDSON and inductor losses. Higher input supply voltages will increase the Gate-to-Source threshold on the internal MOSFETs, which reduces the internal RDSON. This improves efficiency by reducing DC losses in the device. All but the inductor losses are inherent to the device. In this case, inductor selection becomes increasingly critical in efficiency calculations. As the inductors get smaller, the DC resistance (DCR) can become quite significant. The DCR losses can be calculated as follows: 2 PDCR = IOUT x DCR ( V - VOUT ) x D ILOAD > IN 2L x f As shown in the previous equation, the load at which MIC23603 transitions from HyperLight Load mode to PWM mode is a function of the input voltage (VIN), output voltage (VOUT), duty cycle (D), inductance (L), and frequency (f). As shown in Figure 3, as the Output Current increases, the switching frequency also increases, until the MIC23603 goes from HyperLight Load mode to PWM mode at approximately 300mA. The MIC23603 switches a relatively constant frequency around 4MHz after the output current is over 300mA. Switching Frequency vs. Load Current 10000 Eq. 4 From that, the loss in efficiency due to inductor resistance can be calculated as follows: x 100 Eq. 5 Efficiency loss caused by DCR is minimal at light loads and gains significance as the load is increased. Inductor selection becomes a trade-off between efficiency and size. 100 VIN = 3.6V 10 1 0.1 0.0001 VIN=5V 0.001 0.01 VOUT = 1.8V L = 0.33H COUT = 2x47F 0.1 1 10 LOAD CURRENT (A) (R) HyperLight Load Mode MIC23603 uses a minimum on and off time proprietary control loop (patented by Micrel). When the output November 5, 2013 VIN = 2.9V 1000 FREQUENCY (kHz) VOUT x IOUT Efficiency Loss = 1 - VOUT x IOUT + PDCR Eq. 6 Figure 3. SW Frequency vs. Output Current 13 Revision 1.1 Micrel Inc. MIC23603 Typical Application Schematic November 5, 2013 14 Revision 1.1 Micrel Inc. MIC23603 Bill of Materials Item C1, C2, C7, C8 C3, C11, C14 Part Number 06036D106MAT2A GRM188R60J106ME47D 04026D105KAT2A GRM155R60J105KE19D 04025A223JAT2A C4 C5,C6 C10 C12 C13 L1 GRM1555C1H223JA01D Manufacturer Murata Murata Murata TDK AVX Murata AVX GRM1555C1H680JZ01D Murata GRM155R60J475ME47D Murata 04026D475KAT2A 04026C104KAT2A GRM155R70J104KA01D IHLP2020CZERR33M01 CDMC6D28NP-R30MC Qty 10F/6.3V,X5R,0603 4 1F/6.3V,X5R,0402 4 2.2nF/50V,0402 1 47F/6.3V,X5R,1206 2 68pF, 50V, NPO,0402 1 4.7F, 6.3V, X5R, 0402 1 0.1F/6.3V,X7R,0402 1 AVX 12066D476MAT2A 04025A680JAT2A (2) AVX C1005C0G1H223J GRM31CR60J476ME19L Description (1) AVX AVX AVX Murata (3) Vishay Sumida 0.33H, 13.7A , 4.3m (4) 0.3H, 16.1A, 2.7m 1 R1, R2 CRCW0402100KFKED Vishay/Dale 100K, 1%, 1/16W, 0402 2 R3 CRCW0402560KFKEA Vishay/Dale 560K, 1%, 1/6W, 0402 1 R4 CRCW0402294KFKEA Vishay/Dale 294K, 1%, 1/10W, 0402 1 R5 CRCW040210R0FKED Vishay/Dale 10, 1%, 1/16W, 0402 1 4MHz PWM 6A Buck Regulator with (R) HyperLight Load 1 U1 MIC23603YML (5) Micrel , Inc. Notes: 1. AVX: www.avx.com. 2. Murata: www.murata.com. 3. Vishay: www.vishay.com. 4. Sumida: www.sumida.com. 5. Micrel, Inc.: www.micrel.com. November 5, 2013 15 Revision 1.1 Micrel Inc. MIC23603 PCB Layout Recommendations Top Layer Second Layer November 5, 2013 16 Revision 1.1 Micrel Inc. MIC23603 PCB Layout Recommendations (Continued) Third Layer Bottom Layer November 5, 2013 17 Revision 1.1 Micrel Inc. MIC23603 Package Information(1) Note: 1. 20-Pin 4mm x 5mm DFN (ML) Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com. November 5, 2013 18 Revision 1.1 Micrel Inc. MIC23603 Recommended Land Pattern 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) 2013 Micrel, Incorporated. November 5, 2013 19 Revision 1.1 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Micrel: MIC23603YML T5 MIC23603YML TR MIC23603YML-TR MIC23603YML-T5