MIC23153 4MHz PWM 2A Buck Regulator with HyperLight Load™ and Power Good General Description Features The MIC23153 is a high efficiency 4MHz 2A synchronous buck regulator with HyperLight Load™ mode, Power Good output indicator, and programmable soft-start. HyperLight Load™ provides very high efficiency at light loads and ultra-fast transient response which makes the MIC23153 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 2.5mm x 2.5mm Thin MLF® package saves precious board space and requires only four external components. The MIC23153 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 total solution size, less than 1mm in height. The MIC23153 has a very low quiescent current of 22µA and achieves a peak efficiency of 93% in continuous conduction mode. In discontinuous conduction mode, the MIC23153 can achieve 85% efficiency at 1mA. The MIC23153 is available in 10-pin 2.5mm x 2.5mm 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 Output voltage: fixed or adjustable (0.62V to 3.6V) Up to 2A output current Up to 93% peak efficiency 85% typical efficiency at 1mA Power Good output Programmable soft-start 22µA typical quiescent current 4MHz PWM operation in continuous mode Ultra fast transient response Low ripple output voltage − 35mVpp 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 10-pin 2.5mm x 2.5mm Thin MLF® –40°C to +125°C junction temperature range Applications • Solid State Drives (SSD) • Mobile handsets • Portable media/MP3 players • Portable navigation devices (GPS) • WiFi/WiMax/WiBro modules • Wireless LAN cards • Portable applications ____________________________________________________________________________________________________________ Typical Application Fixed Output Voltage Adjustable Output Voltage 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 December 2009 M9999-121409-A Micrel Inc. MIC23153 Ordering Information Marking Code Part Number Nominal Output Voltage Junction Temp. Range Package MIC23153-GYMT WEG 1.8V –40°C to +125°C 10-Pin 2.5mm x 2.5mm Thin MLF® MIC23153YMT WEA Adjustable –40°C to +125°C 10-Pin 2.5mm x 2.5mm Thin MLF® Notes: 1. Other options available (1V - 3.3V). Contact Micrel Marketing for details. ® 2. Thin MLF is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. ® 3. Thin MLF ▲ = Pin 1 identifier. Pin Configuration 2.5mm x 2.5mm Thin MLF® (MT) Fixed Output Voltage (Top View) 2.5mm x 2.5mm Thin MLF® (MT) Adjustable Output Voltage (Top View) Pin Description Pin Number Pin Number (Fixed) (Adjustable) 1 1 SW Switch (Output): Internal power MOSFET output switches. 2 2 EN Enable (Input): Logic high enables operation of the regulator. Logic low will shut down the device. Do not leave floating. 3 3 SNS 4 - NC Not Internally Connected. - 4 FB Feedback: Connect a resistor divider from the output to ground to set the output voltage. 5 5 PG Power Good: Open drain output for the power good indicator. Use a pullup resistor from this pin to a voltage source to detect a power good condition. 6 6 SS Soft Start: Place a capacitor from this pin to ground to program the soft start time. Do not leave floating, 100pF minimum CSS is required. 7 7 AGND Analog Ground: Connect to central ground point where all high current paths meet (CIN, COUT, PGND) for best operation. 8,9 8,9 VIN 10 10 PGND December 2009 Pin Name Pin Function Sense: Connect to VOUT as close to output capacitor as possible to sense output voltage. Input Voltage: Connect a capacitor to ground to decouple the noise. Power Ground. 2 M9999-121409-A Micrel Inc. MIC23153 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN)... …………………………..2.7V to 5.5V Enable Input Voltage (VEN) .. ……………………….0V to VIN Sense Voltage (VSNS) ..................................... 0.62V to 3.6V Junction Temperature Range (TJ)... ….-40°C ≤ TJ ≤ +125°C Thermal Resistance 2.5mm x 2.5mm Thin MLF-10 (θJA) ...................90°C/W 2.5mm x 2.5mm Thin MLF-10 (θJC) ...................63°C/W Supply Voltage (VIN) ........................................... -0.3V to 6V Sense Voltage (VSNS) .........................................-0.3V to VIN Output Switch Voltage (VSW) ..............................-0.3V to VIN Enable Input Voltage (VEN).. ..............................-0.3V to VIN Power Good Voltage (VPG).................................-0.3V to VIN Storage Temperature Range .. ……………-65°C to +150°C Lead temperature (soldering, 10 sec.) ....................... 260°C ESD Rating(3) ................................................. ESD Sensitive 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 (turn-on) 2.45 Supply Voltage Range Under-Voltage Lockout Threshold IOUT = 0mA , SNS > 1.2 * VOUT Nominal Shutdown Current VEN = 0V; VIN = 5.5V VIN = 3.6V if VOUTNOM < 2.5V, ILOAD = 20mA VIN = 4.5V if VOUTNOM ≥ 2.5V, ILOAD = 20mA ILOAD = 20mA Current Limit SNS = 0.9*VOUTNOM Output Voltage Line Regulation VIN = 3.6V to 5.5V if VOUTNOM < 2.5V, ILOAD = 20mA VIN = 4.5V to 5.5V if VOUTNOM ≥ 2.5V, ILOAD = 20mA 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 ISW = 100mA PMOS Output Voltage Load Regulation PWM Switch ON-Resistance Units 5.5 V 2.55 2.65 75 Quiescent Current Feedback Regulation Voltage Max 2.7 Under-Voltage Lockout Hysteresis Output Voltage Accuracy Typ IOUT = 120mA Soft Start Time Soft Start Current 22 45 µA 0.01 5 µA +2.5 % 0.635 V -2.5 0.6045 0.62 2.2 3.3 A 0.3 %/V 0.3 % 0.7 % 0.2 ISW = -100mA NMOS Switching Frequency V mV Ω 0.19 4 MHz VOUT = 90%, CSS = 470pF 320 µs VSS = 0V 2.7 µA Power Good Threshold (Rising) 86 Power Good Threshold Hysteresis Power Good Delay Time Rising Enable Threshold Turn-On 92 96 % 7 % 68 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. December 2009 3 M9999-121409-A Micrel Inc. MIC23153 Typical Characteristics Efficiency v s. Output Current VOUT = 3.3V @ 25°C 100% 100% 90% 90% 80% 80% VIN = 5V 60% EFFICIENCY (%) VIN = 3V 50% VIN = 3.6V 40% VIN = 5V 50% VIN = 5.5V 40% 30% 20% 20% 10% 10% 0% 10 100 1000 OUT PUT CURRENT (mA) VIN = 4.2V 60% 30% 1 100000 70% 1 10 100 1000 OUT PUT CURRENT (mA) 10000 100 2.5 2.0 1.5 1.0 TCASE = 25°C 0.0 1.900 1.875 25 OUTPUT VOLTAGE (V) SHUTDOWN CURRENT (nA) 3.0 20 15 10 5 3.0 3.5 4.0 4.5 INPUT VOLT AGE (V) 5.0 5.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLT AGE (V) 1.80 IOUT = 1A 1.70 3.5 4.0 4.5 5.0 INPUT VOLT AGE (V) 1.900 1.875 1.875 1.850 1.850 1.825 1.800 1.775 1.750 1.725 5.5 90 80 1.83 70 PG DELAY (µs) 1.81 1.80 1.79 1.78 0.02 0.04 0.06 0.08 OUT PUT CURRENT (A) December 2009 VIN = 3.6V 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 OUT PUT CURRENT (A) 90% PG Rising PG Falling PG Rising 89% 88% 87% 86% 85% 84% PG Falling 83% 82% 81% 0 0 20 40 60 80 100 120 T EM PERAT URE (°C) 1.750 91% 30 1.76 ILOAD = 20mA 1.775 PG Thresholds v s. Input Voltage 40 10 1.75 1.800 0.1 50 20 5.5 1.700 60 1.77 3.5 4.0 4.5 5.0 INPUT VOLT AGE (V) 1.825 PG Delay Tim e v s. Input Voltage 1.84 1.82 3.0 1.725 VIN = 3.6V 0 1.85 IOUT = 130mA Output Voltage v s. Output Current (CCM) 1.900 Output Voltage v s. Temperature -40 -20 IOUT = 1mA 1.750 2.5 1.700 3.0 1.775 5.5 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) IOUT = 300mA 2.5 1.800 Output Voltage v s. Output Current (HLL) 1.90 1.75 IOUT = 20mA 1.825 1.700 2.5 Line Regulation (High Loads) 1.85 1.850 1.725 TCASE = 25°C 0 2.5 10000 100000 1000000 CSS (pF) Line Regulation (Low Loads) 30 0.5 1000 Shutdown Current v s. Input Voltage 3.5 CURRENT LIM IT (A) 100 VIN = 3.6V 10000 4.0 OUTPUT VOLTAGE (V) 1000 1 Current Limit v s. Input Voltage OUTPUT VOLTAGE (V) 10000 10 PG THRESHOLD (% of VREF) EFFICIENCY (%) 70% VOUT Rise Tim e v s. C SS 1000000 RISE TIM E (µs) Efficiency v s. Output Current VOUT = 1.8V @ 25°C 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLT AGE (V) 4 5.5 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLT AGE (V) 5.5 M9999-121409-A Micrel Inc. MIC23153 Typical Characteristics (Continued) UVLO Threshold v s. Tem perature Enable Threshold v s. Input Voltage UVLO_ON 2.54 VEN THRESHOLD (V) UVLO THRESHOLD (V) 2.55 2.53 2.52 2.51 2.50 2.49 UVLO_OFF 2.48 1.2 1.2 1.1 1.1 VEN THRESHOLD (V) 2.56 Enable Threshold v s. Temperature 1.0 0.9 0.8 0.7 0.9 0.8 0.7 0.6 0.6 2.47 1.0 TCASE = 25°C 2.46 VIN = 3.3V 0.5 -40 -20 0 20 40 60 80 100 120 T EM PERAT URE (°C) 0.5 2.5 3.0 3.5 4.0 4.5 INPUT VOLT AGE (V) 5.0 5.5 -40 -20 0 20 40 60 80 100 120 T EM PERAT URE (°C) Feedback Voltage v s. Tem perature Switching Frequency v s. Load Current 0.65 10000 1000 100 FEEDBACK VOLTAGE (V) SW FREQUENCY (kHz) L = 2.2µH L = 1µH 10 1 VOUT = 1.8V 0.1 0.0001 0.001 0.01 0.1 LOAD CURRENT (A) December 2009 1 10 0.64 0.63 VIN = 3.6V VIN = 5.5V 0.62 VIN = 2.6V 0.61 0.60 0.59 -40 -20 0 20 40 60 80 100 120 T EM PERAT URE (°C) 5 M9999-121409-A Micrel Inc. MIC23153 Functional Characteristics December 2009 6 M9999-121409-A Micrel Inc. MIC23153 Functional Characteristics (Continued) December 2009 7 M9999-121409-A Micrel Inc. MIC23153 Functional Characteristics (Continued) December 2009 8 M9999-121409-A Micrel Inc. MIC23153 Functional Diagram Figure 1. Simplified MIC23153 Functional Block Diagram – Fixed Output Voltage Figure 2. Simplified MIC23153 Functional Block Diagram – Adjustable Output Voltage December 2009 9 M9999-121409-A Micrel Inc. MIC23153 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. 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. PG The power good (PG) pin is an open drain output which indicates logic high when the output voltage is typically above 92% of its steady state voltage. A pull-up resistor of more than 5kOhms should be connected from PG to VOUT. SS The soft start (SS) pin is used to control the output voltage ramp up time. The approximate equation for the ramp time in milliseconds is 270x103 x ln(10) x CSS. For example, for a CSS = 470pF, Trise ~ 300µs. See the Typical Characteristics curve for a graphical guide. The minimum recommended value for CSS is 100pF. 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. MIC23153 features external soft-start circuitry via the soft start (SS) pin that reduces in-rush current and prevents the output voltage from overshooting at start up. Do not leave the EN pin 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. The output voltage can be programmed between 0.65V and 3.6V using the following equation: 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. R1 ⎞ ⎛ VOUT = VREF ⋅ ⎜1 + ⎟ R2 ⎠ ⎝ 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. Where: R1 is the top resistor, R2 is the bottom resistor. Example feedback resistor values: 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. Refer to the layout recommendations for more details. VOUT R1 R2 1.2V 274k 294k 1.5V 316k 221k 1.8V 301k 158k 2.5V 324k 107k 3.3V 309k 71.5k PGND The power ground pin is the ground path for the high December 2009 10 M9999-121409-A Micrel Inc. MIC23153 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 MIC23153 is a high performance DC-to-DC step down regulator offering a small solution size. Supporting an output current up to 2A inside a tiny 2.5mm x 2.5mm Thin MLF® package, the IC requires only three external components while meeting today’s miniature portable electronic device needs. Using the HyperLight Load™ switching scheme, the MIC23153 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 ⎞⎤ ⎟⎟⎥ IPEAK = ⎢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. The transition between high loads (CCM) to Hyperlight load (HLL) mode is determined by the inductor ripple current and the load current. Input Capacitor A 2.2µF ceramic capacitor or greater should be placed close to the VIN pin and PGND pin for bypassing. A Murata GRM188R60J475ME84D, 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. Output Capacitor The MIC23153 is 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 also increase solution size or cost. A low equivalent series resistance (ESR) ceramic output capacitor such as the Murata GRM188R60J475ME84D, 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. The diagram shows the signals for high side switch drive (HSD) for Ton control, the Inductor current and the low side switch drive (LSD) for Toff control. In HLL mode, the inductor is charged with a fixed Ton pulse on the high side switch (HSD). After this, the LSD is switched on and current falls at a rate VOUT/L. The controller remains in HLL mode while the inductor falling current is detected to cross approximately -50mA. When the LSD (or Toff) time reaches its minimum and the inductor falling current is no longer able to reach this 50mA threshold, the part is in CCM mode and switching at a virtually constant frequency. Once in CCM mode, the Toff time will not vary. Therefore, it is important to note that if L is large enough, the HLL transition level will not be triggered. That inductor is: V ⋅135ns LMAX = OUT 2 ⋅ 50mA 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 MIC23153 is 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 December 2009 11 M9999-121409-A Micrel Inc. MIC23153 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: Compensation The MIC23153 is designed to be stable with a 0.47µH to 2.2µH inductor with a 4.7µF ceramic (X5R) output capacitor. Duty Cycle The typical maximum duty cycle of the MIC23153 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 PDCR = IOUT2 x DCR From that, the loss in efficiency due to inductor resistance can be calculated as follows: ⎞ ⎟⎟ × 100 ⎠ 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 4MHz frequency and the switching transitions make up the switching losses. ⎡ ⎛ VOUT × IOUT Efficiency Loss = ⎢1 − ⎜⎜ ⎢⎣ ⎝ VOUT × IOUT + PDCR 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 MIC23153 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 minimumoff-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 MIC23153 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 MIC23153 during light load currents by only switching when it is needed. As the load current increases, the MIC23153 goes into continuous conduction mode (CCM) and switches at a frequency centered at 4MHz. The equation to calculate the load when the MIC23153 goes into continuous conduction mode may be approximated by the following formula: Efficiency v s. Output Current VOUT = 1.8V @ 25°C 1.00 VIN = 3V 0.90 EFFICIENCY (%) 0.80 0.70 0.60 VIN = 5V VIN = 3.6V 0.50 0.40 0.30 0.20 0.10 0.00001 0.001 0.1 OUT PUT CURRENT (A) 10 Figure 2. Efficiency Under Load ⎛ (V − VOUT ) × D ⎞ ⎟⎟ ILOAD > ⎜⎜ IN 2L × f ⎝ ⎠ As shown in the previous equation, the load at which the MIC23153 transitions from HyperLight Load™ mode to 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 MIC23153 is able to maintain high efficiency at low December 2009 ⎞⎤ ⎟⎥ × 100 ⎟ ⎠⎥⎦ 12 M9999-121409-A Micrel Inc. MIC23153 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 MIC23153 goes from HyperLight Load™ mode to PWM mode at approximately 120mA. The MIC23153 will switch at a relatively constant frequency around 4MHz once the output current is over 120mA. Switching Frequency v s. Load Current 10000 SW FREQUENCY (kHz) L = 2.2µH 1000 100 L = 1µH 10 1 VOUT = 1.8V 0.1 0.0001 0.001 0.01 0.1 1 10 LOAD CURRENT (A) Figure 3. SW Frequency vs. Output Current December 2009 13 M9999-121409-A Micrel Inc. MIC23153 Typical Application Circuit (Fixed Output) Bill of Materials Item C1 Part Number C1608X5R0J475K Manufacturer TDK Description Qty. (1) 1 GRM188R60J475KE19D Murata(2) C1608X5R0J475K TDK GRM188R60J475KE84D Murata C1608NPO0J471K TDK Ceramic Capacitor, 470pF, 6.3V, NPO, Size 0603 VLS3012ST-1R0N1R9 TDK 1µH, 2A, 60mΩ, L3.0mm x W3.0mm x H1.0mm LQH44PN1R0NJ0 Murata R3 CRCW06031002FKEA Vishay(3) Resistor,10k, Size 0603 1 R4 CRCW06031002FKEA Vishay Resistor,10k, Size 0603 1 U1 MIC23153-xYMT Micrel, Inc.(4) 4MHz 2A Buck Regulator with HyperLight Load™ Mode 1 C2 C3 L1 Ceramic Capacitor, 4.7µF, 6.3V, X5R, Size 0603 1 1 1 1µH, 2.8A, 50mΩ, L4.0mm x W4.0mm x H1.2mm Notes: 1. TDK: www.tdk.com 2. Murata: www.murata.com 3. Vishay: www.vishay.com 4. Micrel, Inc.: www.micrel.com December 2009 14 M9999-121409-A Micrel Inc. MIC23153 Typical Application Circuit (Adjustable Output) Bill of Materials Item C1 Part Number C1608X5R0J475K Manufacturer TDK GRM188R60J475KE19D Murata(2) C1608X5R0J475K TDK GRM188R60J475KE84D Murata C3 C1608NPO0J471K TDK C4 - - VLS3010ST-1R0N1R9 TDK C2 L1 LQH44PN1R0NJ0 Description Qty. (1) 1 Ceramic Capacitor, 4.7µF, 6.3V, X5R, Size 0603 1 Ceramic Capacitor, 470pF, 6.3V, NPO, Size 0603 1 Not Fitted (NF) 0 1µH, 2A, 60mΩ, L3.0mm x W3.0mm x H1.0mm (2) Murata 1µH, 2.8A, 50mΩ, L4.0mm x W4.0mm x H1.2mm 1 R1 CRCW06033013FKEA Vishay(3) Resistor,301k, Size 0603 1 R2 CRCW06031583FKEA Vishay Resistor,158k, Size 0603 1 R3 CRCW06031002FKEA Vishay Resistor,10k, Size 0603 1 R4 CRCW06031002FKEA Vishay Resistor,10k, Size 0603 1 U1 MIC23153-AYMT Micrel, Inc.(4) 4MHz 2A Buck Regulator with HyperLight Load™ Mode 1 Notes: 1. TDK: www.tdk.com 2. Murata : www.murata.com 3. Vishay: www.vishay.com 4. Micrel, Inc.: www.micrel.com December 2009 15 M9999-121409-A Micrel Inc. MIC23153 PCB Layout Recommendations Top Layer Bottom Layer December 2009 16 M9999-121409-A Micrel Inc. MIC23153 Package Information 10-Pin 2.5mm x 2.5mm Thin MLF December 2009 17 ® M9999-121409-A Micrel Inc. MIC23153 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 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. © 2009 Micrel, Incorporated. December 2009 18 M9999-121409-A