MIC23030 8MHz PWM 400mA Buck Regulator with HyperLight Load™ General Description Features The MIC23030 is a high efficiency 8MHz 400mA synchronous buck regulator with HyperLight Load™ mode. HyperLight Load™ provides very high efficiency at light loads and ultra-fast 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 1.6mm x 1.6mm Thin MLF® package saves precious board space and requires only three external components. The MIC23030 is designed for use with a very small inductor, down to 0.47µH, and an output capacitor as small as 2.2 µF that enables a sub-1mm height. The MIC23030 has a very low quiescent current of 21µA and achieves as high as 83% efficiency at 1mA. At higher loads, the MIC23030 provides a constant switching frequency around 8MHz while achieving peak efficiencies up to 91%. The MIC23030 is available in a 6-pin 1.6mm x 1.6mm Thin MLF® package with an operating junction temperature range from –40°C to +125°C. Datasheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • • • • • • • • • • • • • Input voltage: 2.7V to 5.5V HyperLight Load™ 400mA output current Up to 91% efficiency and 83% at 1mA 21µA typical quiescent current 8MHz PWM operation in continuous mode Ultra fast transient response Low voltage output ripple − 14mVpp ripple in HyperLight Load™ mode − 5mV output voltage ripple in full PWM mode Fully integrated MOSFET switches 0.01µA shutdown current Thermal shutdown and current limit protection Fixed and adjustable output voltage options available 6-pin 1.6mm x 1.6mm Thin MLF® –40°C to +125°C junction temperature range Applications • Mobile handsets • Portable media/MP3 players • Portable navigation devices (GPS) • WiFi/WiMax/WiBro modules • Digital Cameras • Wireless LAN cards • USB powered devices • Portable applications ____________________________________________________________________________________________________________ Typical Application 1 VIN SW EN SNS L1 C1 EN 4 AGND GND 5 VOUT 2 3 C2 PGND 6 VIN = 3.0V 90 EFFICIENCY (%) VIN 2.7V to 5.5V Efficiency VOUT = 2.5V 100 U1 MIC23030 VIN = 3.6V 80 70 VIN = 4.2V L = 0.47µH COUT = 4.7µF 60 GND 50 1 10 100 1000 OUTPUT CURRENT (mA) HyperLight Load is a trademark of Micrel, Inc. MLF and MicroLeadFrame are registered trademark Amkor Technology 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 2008 M9999-082608-B Micrel Inc. MIC23030 Ordering Information Part Number Marking Code Nominal Output Voltage Junction Temp. Range Package Lead Finish MIC23030-AYMT GDA ADJ –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® Pb-Free MIC23030-GYMT* GDG 1.8V –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF® Pb-Free –40°C to +125°C 6-Pin 1.6mm x 1.6mm Thin MLF ® Pb-Free 6-Pin 1.6mm x 1.6mm Thin MLF ® Pb-Free 6-Pin 1.6mm x 1.6mm Thin MLF ® Pb-Free MIC23030-FYMT* GDF MIC23030-4YMT 1.5V GD4 MIC23030-CYMT* 1.2V GDC 1.0V –40°C to +125°C –40°C to +125°C Notes: 1. Other options available. Contact Micrel for details. ® 2. Thin MLF is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. * Available August 2008. Pin Configuration VIN 1 6 PGND VIN 1 6 GND SW 2 5 AGND SW 2 5 FB SNS 3 4 EN SNS 3 4 EN 1.6 x 1.6mm Thin MLF® (MT) Fixed (Top View) 1.6 x 1.6mm Thin MLF® (MT) Adjustable (Top View) Pin Description Fixed Option ADJ Option Pin Name 1 1 VIN Input Voltage: Connect a capacitor to ground to decouple the noise. 2 2 SW Switch (Output): Internal power MOSFET output switches. 3 3 SNS Sense: Connect to VOUT as close to output capacitor as possible to sense output voltage. 4 4 EN Enable (Input): Logic high enables operation of the regulator. Logic low will shut down the device. Do not leave floating. 5 - AGND Analog Ground: Connect to central ground point where all high current paths meet (CIN, COUT, PGND) for best operation. - 5 FB Feedback (Input): Connect resistor divider at this node to set output voltage. Resistors should be selected based on a nominal VFB of 0.62V. 6 - PGND - 6 GND E-PAD E-PAD HS PAD August 2008 Pin Function Power Ground. Ground. Connect to PGND or GND. 2 M9999-082608-B Micrel Inc. MIC23030 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 .. ……………-65°C to +150°C ESD Rating(3) ................................................. ESD Sensitive Supply Voltage (VIN)... …………………………..2.7V to 5.5V Enable Input Voltage (VEN) .. ……………………….0V to VIN Output Voltage Range (VSNS) ………………….0.7V to 3.6V Junction Temperature Range (TJ)... ….-40°C ≤ TJ ≤ +125°C Thermal Resistance 1.6mm x 1.6mm Thin MLF-6 (θJA) ..................92.4°C/W Electrical Characteristics(4) TA = 25°C; VIN = VEN = 3.6V; L = 1.0µH; COUT = 4.7µF unless otherwise specified. Bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted. Parameter Condition Min Under-Voltage Lockout Threshold (turn-on) 2.45 Quiescent Current IOUT = 0mA , SNS > 1.2 * VOUT Nominal Shutdown Current VEN = 0V; VIN = 5.5V Supply Voltage Range Output Voltage Accuracy Typ Max Units 5.5 V 2.55 2.65 V 21 35 µA 0.01 4 µA +2.5 % 2.7 VIN = 3.6V; ILOAD = 20mA -2.5 Feedback Voltage Adjustable Option Only Current Limit SNS = 0.9*VOUTNOM Output Voltage Line Regulation VIN = 3.0V to 5.5V, VOUT = 1.2V, ILOAD = 20mA, 0.3 %/V Output Voltage Load Regulation 20mA < ILOAD < 400mA, VOUT = 1.2V, VIN = 3.6V 0.7 % ISW = 100mA PMOS 0.65 ISW = -100mA NMOS 0.8 PWM Switch ON-Resistance Maximum Frequency IOUT = 120mA SoftStart Time VOUT = 90% 0.62 0.41 Enable Threshold 0.7 V 1 A Ω 8 MHz 100 µs 0.9 1.2 V Enable Input Current 0.1 2 µA Over-temperature Shutdown 160 °C Over-temperature Shutdown Hysteresis 20 °C 0.5 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. August 2008 3 M9999-082608-B Micrel Inc. MIC23030 Typical Characteristics SW Frequency vs. Inductance L = 2.2µH 1 L = 1µH 0.1 L = 0.47µH 0.01 1 August 2008 VIN = 3.6V VOUT = 1.8V COUT = 4.7µF 10 100 1000 OUTPUT CURRENT (mA) 1 VIN = 3.0V VIN = 3.6V 0.1 0.01 VOUT = 1.8V L = 0.47µH COUT = 4.7µF VIN = 4.2V 1 10 100 1000 OUTPUT CURRENT (mA) 4 8.5 8.0 7.5 120 80 100 6.0 60 L = 0.47µH COUT = 4.7µF Load = 120mA 7.0 6.5 TEMPERATURE (°C) SW Frequency vs. Output Current 10 5.7 9.0 40 L = 0.47µH COUT = 4.7µF Load = 120mA 8MHz SW FREQUENCY (MHz) SW FREQUENCY (MHz) 1.2 1.18 TEMPERATURE (°C) 8MHz 0.001 VOUT = 1.2V 1.22 1.14 1.12 VOUT = 1.2V L = 0.47µH COUT = 4.7µF 9.5 1.24 1.16 50mA Frequency vs. Temperature 10.0 1.28 1.26 1.10 10 100 1000 OUTPUT CURRENT (mA) 10 Output Voltage vs. Temperature 1.30 1mA 3.2 3.7 4.2 4.7 5.2 INPUT VOLTAGE (V) 20 1 5.7 0 1.12 1.10 VOUT = 1.2V L = 0.47µH COUT = 4.7µF 3.2 3.7 4.2 4.7 5.2 INPUT VOLTAGE (V) 1.14 1.12 1.1 2.7 -20 1.16 1.14 VIN = 3.0V Not switching L = open VOUT = 1.2*Vnom 5 10 100 1000 OUTPUT CURRENT (mA) Output Voltage vs. Input Voltage -40 1.2 1.18 VIN = 3.6V 15 ENABLE THRESHOLD (V) VIN = 4.2V 20 -40 1.26 1.24 1.22 25 10 1 1.28 1.26 1.24 150mA 10mA 1.22 1.2 1.18 400mA 1.16 300mA FREQUENCY (MHz) Output Voltage vs. Output Current 1.30 1.28 30 L = 0.47µH COUT = 4.7µF VIN = 3.6V 1.3 35 0 2.7 10 100 1000 OUTPUT CURRENT (mA) 50 120 1 VIN = 3.6V COUT = 4.7µF VIN = 4.2V 60 100 L = 2.2µH 70 Quiescent Current vs. Input Voltage 80 L = 0.47µH 70 VIN = 3.0V 80 10 100 1000 OUTPUT CURRENT (mA) 60 80 1 40 QUIESCENT CURRENT (µA) EFFICIENCY (%) L = 1.0µH 60 OUTPUT VOLTAGE (V) 50 10 100 1000 OUTPUT CURRENT (mA) 90 50 60 Efficiency with Various Inductors 100 L = 0.47µH COUT = 4.7µF 40 1 VIN = 3.6V 0 60 VIN = 4.2V 70 VIN = 2.7V 90 80 20 L = 0.47µH COUT = 4.7µF VIN = 2.7V VIN = 3.0V -20 VIN = 4.2V EFFICIENCY (%) 70 OUTPUT VOLTAGE (V) EFFICIENCY (%) VIN = 3.6V 80 50 90 Efficiency VOUT = 1.2V 100 EFFICIENCY (%) VIN = 3.0V 90 Efficiency VOUT = 1.8V 100 OUTPUT VOLTAGE (V) Efficiency VOUT = 2.5V 100 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 2.7 Enable Threshold vs. Input Voltage Enable On 3.2 3.7 4.2 4.7 5.2 INPUT VOLTAGE (V) 5.7 M9999-082608-B Micrel Inc. MIC23030 Typical Characteristics (continued) Enable Threshold vs. Temperature 900 VIN = 3.6V 0.8 800 Enable On CURRENT LIMIT (mA) 1.0 VIN = 2.7V VIN = 5.5V 0.6 0.4 TEMPERATURE (°C) August 2008 700 600 500 400 300 200 100 120 100 80 60 0 -40 0 20 0.2 40 L = 0.47µH COUT = 4.7µF -20 ENABLE THRESHOLD (V) 1.2 Current Limit vs. Input Voltage 0 2.7 3.2 3.7 4.2 4.7 5.2 INPUT VOLTAGE (V) 5 5.7 M9999-082608-B Micrel Inc. MIC23030 Functional Characteristics August 2008 6 M9999-082608-B Micrel Inc. MIC23030 Functional Characteristics (continued) August 2008 7 M9999-082608-B Micrel Inc. MIC23030 Functional Characteristics (continued) August 2008 8 M9999-082608-B Micrel Inc. MIC23030 Functional Diagram VIN EN CONTROL LOGIC Timer & Softstart UVLO Gate Drive Reference SW Current Limit ERROR COMPARATOR ZERO 1 ISENSE PGND SNS AGND Simplified MIC23030 Fixed Functional Block Diagram VIN EN CONTROL LOGIC Timer & Softstart UVLO Gate Drive Reference SW Current Limit ZERO 1 ERROR COMPARATOR ISENSE SNS FB GND Simplified MIC23030 Adjustable Functional Block Diagram August 2008 9 M9999-082608-B Micrel Inc. MIC23030 FB (Adjustable Output Only) The feedback pin (FB) allows the regulated output voltage to be set by applying an external resistor network. The internal reference voltage is 0.62V and the recommended value of R2 is 200kΩ. The output voltage is calculated from the equation below: Functional Description VIN The input supply (VIN) provides power to the internal MOSFETs for the switch mode regulator along with the internal control circuitry. The VIN operating range is 2.7V to 5.5V so an input capacitor, with a minimum voltage rating of 6.3V, is recommended. Due to the high switching speed, a minimum 2.2µF bypass capacitor placed close to VIN and the power ground (PGND) pin is required. Refer to the layout recommendations for details. ⎛ R1 ⎞ VOUT = 0.62V ⎜ + 1⎟ ⎝ 200kΩ ⎠ U1 MIC23030 VIN EN A logic high signal on the enable pin activates the output voltage of the device. A logic low signal on the enable pin deactivates the output and reduces supply current to 0.01µA. MIC23030 features built-in soft-start circuitry that reduces in-rush current and prevents the output voltage from overshooting at start up. Do not leave floating. 1 VIN SW 2 SNS 3 FB 5 L1 C1 4.7µF EN 4 EN GND GND 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. Due to the high speed switching on this pin, the switch node should be routed away from sensitive nodes whenever possible. 6 VOUT R1 383k R2 200k C2 4.7µF GND Figure 1. MIC23030-AYMT Schematic PGND / GND 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. Refer to the layout recommendations for more details. SNS The sense (SNS) pin is connected to the output of the device to provide feedback to the control circuitry. The SNS connection should be placed close to the output capacitor. Refer to the layout recommendations for more details. AGND (Fixed Output Only) 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. Refer to the layout recommendations for more details. August 2008 10 M9999-082608-B Micrel Inc. MIC23030 in inductance. Ensure 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: Application Information The MIC23030 is a high performance DC/DC step down regulator offering a small solution size. Supporting an output current up to 400mA inside a tiny 1.6mm x 1.6mm Thin MLF® package and requiring only three external components, the MIC23030 meets today’s miniature portable electronic device needs. Using the HyperLight Load™ switching scheme, the MIC23030 is able to maintain 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 ⎞⎤ I PEAK = ⎢IOUT + VOUT ⎜ ⎟⎥ ⎝ 2 × f × L ⎠⎦ ⎣ As shown by the calculation above, 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 Circuit and Bill of Materials for details. DC resistance (DCR) is also important. While DCR is inversely proportional to size, DCR can represent a significant efficiency loss. Refer to the Efficiency Considerations. Input Capacitor A 2.2µF ceramic capacitor or greater should be placed close to the VIN pin and PGND / GND pin for bypassing. A TDK C1608X5R0J475K, size 0603, 4.7µF ceramic capacitor is recommended based upon performance, size and cost. A 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. Compensation The MIC23030 is designed to be stable with a 0.47µH to 2.2µH inductor with a minimum of 2.2µF ceramic (X5R) output capacitor. Output Capacitor The MIC23030 was designed for use with a 2.2µF or greater ceramic output capacitor. Increasing the output capacitance will lower output ripple and improve load transient response but could increase solution size or cost. A low equivalent series resistance (ESR) ceramic output capacitor such as the TDK C1608X5R0J475K, size 0603, 4.7µF 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 due to their wide variation in capacitance over temperature and increased resistance at high frequencies. Duty Cycle The typical maximum duty cycle of the MIC23030 is 80%. Efficiency Considerations Efficiency is defined as the amount of useful output power, divided by the amount of power supplied. ⎛V ×I Efficiency % = ⎜⎜ OUT OUT ⎝ VIN × IIN 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 consumption of current for battery powered applications. Reduced current draw from a battery increases the devices 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 the power dissipation of I2R. 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 Nchannel MOSFET conducts, also dissipating power. Device operating current also reduces efficiency. The product of the quiescent (operating) current and the supply voltage represents another DC loss. The current required driving the gates on and off at a constant 8MHz frequency and the switching transitions make up the switching losses. Inductor Selection When selecting an inductor, it is important to consider the following factors (not necessarily in the order of importance): • Inductance • Rated current value • Size requirements • DC resistance (DCR) The MIC23030 was designed for use with a 0.47µH to 2.2µH inductor. For faster transient response, a 0.47µH inductor will yield the best result. For lower output ripple, a 2.2µH 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 either for a 40°C temperature rise or a 10% to 20% loss August 2008 ⎞ ⎟ × 100 ⎟ ⎠ 11 M9999-082608-B Micrel Inc. MIC23030 off-time until the output drops below the threshold. The NMOS acts as an ideal rectifier that conducts when the PMOS is off. Using a 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 MIC23030 works in pulse frequency modulation (PFM) to regulate the output. As the output current increases, the off-time decreases, thus provides more energy to the output. This switching scheme improves the efficiency of MIC23030 during light load currents by only switching when it is needed. As the load current increases, the MIC23030 goes into continuous conduction mode (CCM) and switches at a frequency centered at 8MHz. The equation to calculate the load when the MIC23030 goes into continuous conduction mode may be approximated by the following formula: Figure 2. Efficiency Under Load The figure above shows an efficiency curve. From no load to 100mA, efficiency losses are dominated by quiescent current losses, gate drive and transition losses. By using the HyperLight Load™ mode, the MIC23030 is able to maintain high efficiency at low output currents. Over 100mA, 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, thereby reducing the internal RDSON. This improves efficiency by reducing DC losses in the device. All but the inductor losses are inherent to the device. In which case, inductor selection becomes increasingly critical in efficiency calculations. As the inductors are reduced in size, the DC resistance (DCR) can become quite significant. The DCR losses can be calculated as follows: ⎛ (V − VOUT ) × D ⎞ ⎟⎟ I LOAD > ⎜⎜ IN 2L × f ⎠ ⎝ As shown in the previous equation, the load at which MIC23030 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). This is illustrated in the graph below. Since the inductance range of MIC23030 is from 0.47µH to 2.2µH, the device may then be tailored to enter HyperLight Load™ mode or PWM mode at a specific load current by selecting the appropriate inductance. For example, in the graph below, when the inductance is 2.2µH the MIC23030 will transition into PWM mode at a load of approximately 30mA. Under the same condition, when the inductance is 0.47µH, the MIC23030 will transition into PWM mode at approximately 120mA. PDCR = IOUT2 x DCR From that, the loss in efficiency due to inductor resistance can be calculated as follows: ⎡ ⎛ VOUT × IOUT Efficiency Loss = ⎢1 − ⎜⎜ V ⎣⎢ ⎝ OUT × IOUT + PDCR ⎞⎤ ⎟⎥ × 100 ⎟ ⎠⎦⎥ Efficiency loss due to DCR is minimal at light loads and gains significance as the load is increased. Inductor selection becomes a trade-off between efficiency and size in this case. HyperLight Load™ Mode MIC23030 uses a minimum on and off time proprietary control loop (patented by Micrel). When the output 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 minimum- August 2008 Figure 3. SW Frequency vs. Inductance 12 M9999-082608-B Micrel Inc. MIC23030 MIC23030 Typical Application Circuit (Fixed) U1 MIC23030 J1 VIN 2.7 to 5.5V J5 EN SW VIN C1 J3 VOUT L1 C2 SNS EN AGND PGND J2 GND J4 GND Bill of Materials Item C1, C2 L1 Part Number C1608X5R0J475K (1) TDK Description Murata 0.47µH, 0.9A, 90mΩ, L2mm x W1.25mm x H0.5mm LQH32CNR47M33 Murata(2) 0.47µH, 1.1A, 42mΩ, L3.2mm x W2.5mm x H2.0mm LQM31PNR47M00 (2) Murata TDK MIPF2520D1R5 FDK(3) MIC23030-xYMT 1 1µH, 0.8A, 100mΩ, L2.5mm x W1.8mm x H1.35mm 1.5µH, 1.5A, 70mΩ, L2.5mm x W2mm x H1.0mm Coilcraft(4) Micrel, Inc. 2 0.47µH, 1.4A, 80mΩ, L3.2mm x W1.6mm x H0.85mm (1) GLF251812T1R0M Qty. 4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603 (2) LQM21PNR47M00 EPL2010-471 U1 Manufacturer (5) 0.47µH, 1.6A, 40mΩ, L2.0mm x W1.8mm x H1.0mm 8MHz 400mA Buck Regulator with HyperLight Load™ Mode 1 Notes: 1. TDK: www.tdk.com 2. Murata: www.murata.com 3. FDK: www.fdk.co.jp 4. Coilcraft: www.coilcraft.com 5. Micrel, Inc.: www.micrel.com August 2008 13 M9999-082608-B Micrel Inc. MIC23030 MIC23030 Typical Application Circuit (Adjustable 1.8V) U1 MIC23030 J1 VIN J5 EN SW VIN C1 J3 VOUT L1 SNS EN C2 FB R2 200k PGND J2 GND R1 383k J4 GND Bill of Materials Item C1, C2 Part Number C1608X5R0J475K Manufacturer (1) TDK Description Qty. 4.7µF Ceramic Capacitor, 6.3V, X5R, Size 0603 2 (2) R1 CRCW06033833FT1 Vishay 383kΩ, 1%, Size 0603 1 R2 CRCW06032003FT1 Vishay(2) 200kΩ, 1%, Size 0603 1 LQM21PNR47M00 L1 0.47µH, 0.9A, 90mΩ, L2mm x W1.25mm x H0.5mm (3) Murata LQH32CNR47M33 Murata 0.47µH, 1.1A, 42mΩ, L3.2mm x W2.5mm x H2.0mm LQM31PNR47M00 Murata(3) 0.47µH, 1.4A, 80mΩ, L3.2mm x W1.6mm x H0.85mm (1) GLF251812T1R0M TDK MIPF2520D1R5 FDK(4) EPL2010-471 U1 (3) MIC23030-AYMT Coilcraft 1 1µH, 0.8A, 100mΩ, L2.5mm x W1.8mm x H1.35mm 1.5µH, 1.5A, 70mΩ, L2.5mm x W2mm x H1.0mm (5) Micrel, Inc.(6) 0.47µH, 1.6A, 40mΩ, L2.0mm x W1.8mm x H1.0mm 8MHz 400mA Buck Regulator with HyperLight Load™ Mode 1 Notes: 1. TDK: www.tdk.com 2. Vishay: www.vishay.com 3. Murata: www.murata.com 4. FDK: www.fdk.co.jp 5. Coilcraft: www.coilcraft.com 6. Micrel, Inc.: www.micrel.com August 2008 14 M9999-082608-B Micrel Inc. MIC23030 PCB Layout Recommendations (Fixed) Fixed Top Layer Fixed Bottom Layer August 2008 15 M9999-082608-B Micrel Inc. MIC23030 PCB Layout Recommendations (Adjustable) Adjustable Top Layer Adjustable Bottom Layer August 2008 16 M9999-082608-B Micrel Inc. MIC23030 Package Information 6-Pin (1.6mm x 1.6mm) Thin MLF® (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 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. © 2008 Micrel, Incorporated. August 2008 17 M9999-082608-B