MIC2202 High Efficiency 2MHz Synchronous Buck Converter 1µF Stable PWM Regulator General Description Features The Micrel MIC2202 is a high efficiency 2MHz PWM synchronous buck regulator. The fast 2MHz operation along with a proprietary compensation scheme allows the smallest possible external components. The MIC2202 can operate with a 1µF ceramic output capacitor and a small, low DC-resistance, 2.2µH inductor, reducing system size and cost while allowing a high level of efficiency. The MIC2202 operates from 2.3V to 5.5V input and features internal power MOSFETs that can supply over 600mA of output current with output voltages down to 0.5V. The MIC2202 implements a constant 2MHz pulsewidth-modu-lation (PWM) control scheme which reduces noise in sensitive RF, audio, and communications applications. Additionally, the MIC2202 can be synchronized to an external clock, or multiple MIC2202s can easily be daisy-chained with the SYNCLOCK feature. The MIC2202 has a high bandwidth loop (up to 500kHz) which allows ultra fast transient response times. This is very useful when powering applications that require fast dynamic response such as CPU cores and RF circuitry in high performance cellular phones and PDAs. The MIC2202 is available in 10-pin MSOP and 10-pin 3mm × 3mm MLF® package options with an operating junction temperature range from –40°C to +125°C. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • • • • • • • • • • • • • • • • Input voltage range: 2.3V to 5.5V Output down to 0.5V/600mA 2MHz PWM operation Stable with 1µF ceramic output capacitor. Ultra-fast transient response (up to 500kHz GBW) Internal compensation All ceramic capacitors >95% efficiency Fully integrated MOSFET switches Easily synchronized to external clock SYNCLOCK feature to daisy chain multiple 2202s Requires only 4 external components 1% line and load regulation Logic controlled micropower shutdown Thermal shutdown and current limit protection 10-pin MSOP and 10-pin 3mm×3mm MLF® package options • –40°C to +125°C junction temperature range Applications • • • • • Cellular phones PDAs 802.11 WLAN power supplies FPGA/ASIC power supplies Dynamically adjustable power supply for CDMA/WCDMA RF power amps • DSL modems • Tape drives ___________________________________________________________________________________________________________ Typical Application 2.2µH SYNC_IN SYNC_OUT EN 1 10 2 9 3 8 4 7 5 6 100 Efficiency 3.3VOUT 4.2VIN 95 10k EFFICIENCY (%) VIN 2.3V to 5.5V VOUT 3.3V 600mA 1µF 10nF 1.78k 90 85 5VIN 80 75 70 L = 2.2µH COUT = 1µF 65 60 0 Adjustable Output Synchronous Buck Regulator 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 MLF and MicroLeadFrame are registered trademarks of 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 March 2007 1 M9999-031907 Micrel, Inc. MIC2202 Ordering Information Part Number Voltage Temperature Range Package MIC2202BMM Adj. –40° to +125°C 10-Pin MSOP MIC2202BML Adj. MIC2202YMM MIC2202YML Lead Finish Standard ® –40° to +125°C 10-Pin MLF Standard Adj. –40° to +125°C 10-Pin MSOP Pb-Free Adj. –40° to +125°C 10-Pin MLF® Pb-Free Pin Configuration 10 GND SW 1 10 GND VIN 2 9 GND VIN 2 9 GND SYNC_IN 3 8 GND SYNC_IN 3 8 GND SYNC_OUT 4 7 BIAS SYNC_OUT 4 7 BIAS SW 1 EN 5 EN 5 EP 6 FB 6 FB 10-Pin MLF® (ML) 10-Pin MSOP (MM) Pin Description Pin Number Pin Name 1 SW Switch (Output): Internal power MOSFET output switches. Pin Function 2 VIN Supply Voltage (Input): Requires bypass capacitor to GND. 3 SYNC_IN 4 SYNC_OUT 5 EN A low level EN will power down the device, reducing the quiescent current to under 1µA. 6 FB Input to the error amplifier, connect to the external resistor divider network to set the output voltage. 7 BIAS Internal circuit bias supply, nominally 2.3V. Must be de-coupled to signal ground with a 0.01µF capacitor. SYNC_IN for the MIC2202: Sync the main switching frequency to an external clock. SYNC_OUT an open collector output. 8, 9, 10 GND Ground. EP GND Ground, backside pad. March 2007 2 M9999-031907 Micrel, Inc. MIC2202 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) .........................................................6V Output Switch Voltage (VSW) ............................................6V Logic Input Voltage (VEN, VSYNC_IN).................... VIN to –0.3V Power Dissipation ..................................................... Note 3 Storage Temperature (Ts) .........................–65°C to +150°C ESD Rating(4) .................................................................. 2kV Supply Voltage (VIN)..................................... +2.3V to +5.5V Junction Temperature (TJ) ..................–40°C ≤ TJ ≤ +125°C Package Thermal Resistance MSOP-10L (θJA) ...............................................115°C/W 3x3 MLF-10 (θJA) ...............................................60°C/W Electrical Characteristics(5) TA = 25°C with VIN = 3.5V unless otherwise noted; bold values indicate –40°C< TJ < +125°C. Parameter Condition Min Typ Max 5.5 V EN = VIN; VFB = 0.55V (not switching) 350 450 µA EN = 0V 0.01 1 µA 0.5 0.5125 V Supply Voltage Range Quiescent Current 2.3 MIC2202 [Adjustable] Feedback Voltage 0.4875 Units Output Voltage Line Regulation VOUT < 2V; VIN = 2.3V to 5.5V, ILOAD= 100mA 0.05 0.5 % Output Voltage Load Regulation 0mA < ILOAD < 500mA 0.1 0.5 % 2.32 2.6 Bias Regulator Output Voltage 2.2 Maximum Duty Cycle VFB = 0.7V 100 Current Limit VFB = 0.7V 1 Switch ON-Resistance V % 1.8 2.5 A VIN = 3.5V, ISW = 300mA; VFB = 0.35V 0.65 0.9 Ω VIN = 3.5V, ISW = 300mA; VFB = 0.55V 0.55 0.75 Ω 0.01 1 µA 2.5 MHz Enable Input Current Sync Frequency Range 1.6 SYNC_IN Threshold 0.7 Sync Minimum Pulse Width 1 1.7 10 SYNC_IN Input Current V ns 1 µA Oscillator Frequency 1.8 2 2.2 MHz Enable Threshold 0.5 0.9 1.3 V Enable Hysteresis 20 mV Over-temperature Shutdown 160 °C Over-temperature Shutdown Hysteresis 20 °C Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Absolute maximum power dissipation is limited by maximum junction temperature where PD(MAX) = (TJ(MAX) – TA) ÷ θJA. 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 5. Specification for packaged product only. March 2007 3 M9999-031907 Micrel, Inc. MIC2202 Typical Characteristics 0.5000 0.4975 0.5 0.500 0.495 Bias Supply vs. Temperature 0 0 250 2.312 2.31 2.308 200 IQ 2.314 150 100 2.306 50 2.302 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 0 2.30 2.20 2.10 2.00 1.90 1.80 1.70 1.60 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) ENABLE THRESHOLD (V) Frequency vs. Temperature VF B = 0V 0 1.0 0.9 0.8 0.7 0.6 1 2 3 4 5 SUPPLY VOLTAGE (V) 6 Enable Threshold vs. Supply Voltage Enable On Enable Off 0.5 0.4 0.3 0.2 0.1 0 2.3 2.8 3.3 3.8 4.3 4.8 5.3 SUPPLY VOLTAGE (V) 4 2 4 SUPPLY VOLTAGE (V) 6 Quiescent Current vs. Temperature Quiescent Current vs. Supply Voltage 300 IQ (µA) BIAS SUPPLY (V) VF B = 0V 350 2.304 FREQUENCY (MHz) 1.0 0.485 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 2.316 March 2007 1.5 0.5 0.490 2.318 2.40 2.0 0.505 354 352 350 348 346 344 342 340 338 336 334 VIN = 3.6V 332 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 0.9 ENABLE THRESHOLD (V) 2.320 0.1 0.2 0.3 0.4 OUTPUT CURRENT (A) 0.510 (µA) 0.4950 0 2.5 V BIAS (V) 0.5025 VBIAS vs. Supply Voltage Output Voltage vs. Temperature 0.515 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 0.5050 Outout Voltage vs. Output Current Enable Threshold vs. Temperature 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 3.6VIN 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) M9999-031907 Micrel, Inc. MIC2202 Block Diagram VIN CIN SYNC_OUT Oscillator Ramp Generator SYNC_IN BIAS VIN Internal Supply Error Amplifier PWM Comparator SW Driver VOUT COUT 0.5V EN MIC2202 FB PGND MIC2202 Block Diagram March 2007 5 M9999-031907 Micrel, Inc. MIC2202 Functional Description Sync_Out Sync_Out is an open collector output that provides a signal equal to the internal oscillator frequency. This creates the ability for multiple MIC2202s to be connected together in a master-slave configuration for frequency matching of the converters. A typical 10kΩ is recommended for a pull-up resistor. VIN VIN provides power to the output and to the internal bias supply. The supply voltage range is from 2.3V to 5.5V. A minimum 1µF ceramic is recommended for bypassing the input supply. Enable The enable pin provides a logic level control of the output. In the off state, supply current of the device is greatly reduced (typically <1µA). Also, in the off state, the output drive is placed in a “tri-stated” condition, where both the high side P-Channel MOSFET and the low-side N-Channel are in an off or non-conducting state. Do not drive the enable pin above the supply voltage. Bias The bias supply is an internal 2.3V linear regulator that supplies the internal biasing voltage to the MIC2202. A 10nF ceramic capacitor is required on this pin for bypassing. Do not use the bias pin as a supply. The bias pin was designed to supply internal power only. Feedback The feedback pin provides the control path to control the output. A resistor divider connecting the feedback to the output is used to adjust the desired output voltage. Refer to the feedback section in the “Applications Information” for more detail. Sync_In Sync_In pin enables the ability to change the fundamental switching frequency. The Sync_In frequency has a minimum frequency of 1.6MHz and a maximum sync frequency of 2.5MHz. Careful attention should be paid to not driving the Sync_In pin greater than the supply voltage. While this will not damage the device, it can cause improper operation. MIC2202 “Master” VIN SW BIAS SYNC_IN SYNC_OUT FB MIC2202 “Slave” VIN SW BIAS SYNC_IN SYNC_OUT FB Figure 1. Master-Slave Operation March 2007 6 M9999-031907 Micrel, Inc. MIC2202 Application Information below for a more detailed description. Input Capacitor A minimum 1µF ceramic is recommended on the VIN pin for bypassing. X5R or X7R dielectrics are recommended for the input capacitor. Y5V dielectrics, aside from losing most of their capacitance over temperature, they also become resistive at high frequencies. This reduces their ability to filter out high frequency noise. Bias Capacitor A small 10nF ceramic capacitor is required to bypass the bias pin. The use of low ESR ceramics provides improved filtering for the bias supply. Efficiency Considerations Efficiency is defined as the amount of useful output power, divided by the amount of power consumed. Output Capacitor The MIC2202 was designed specifically for the use of a 1µF ceramic output capacitor. This value can be increased to improve transient performance. Since the MIC2202 is voltage mode, the control loop relies on the inductor and output capacitor for compensation. For this reason, do not use excessively large output capacitors. The output capacitor requires either an X7R or X5R dielectric. Y5V and Z5U dielectric capacitors, aside from the undesirable effect of their wide variation in capacitance over temperature, become resistive at high frequencies. Using Y5V or Z5U capacitors will cause instability in the MIC2202. Total output capacitance should not exceed 15µF. Large values of capacitance can cause current limit to engage during start-up. If larger than 15µF is required, a feedforward capacitor from the output to the feedback node should be used to slow the start up time. ⎛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, critical in hand held devices. There are two loss terms 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 RDS(ON) multiplied by the Switch Current2. During the off cycle, the low side N-Channel MOSFET conducts, also dissipating power. Device operating current also reduces efficiency. The product of the quiescent (operating) current and the supply voltage is another DC loss. The current required to drive the gates on and off at a constant 2MHz frequency and the switching transitions make up the switching losses. Figure 2 shows an efficiency curve. The non-shaded portion, from 0mA to 200mA, efficiency losses are dominated by quiescent current losses, gate drive and transition losses. In this case, lower supply voltages yield greater efficiency in that they require less current to drive the MOSFETs and have reduced input power consumption. Inductor Selection Inductor selection will be determined by the following (not necessarily in the order of importance): • Inductance • Rated current value • Size requirements • DC resistance (DCR) The MIC2202 is designed for use with a 1µH to 4.7µH inductor. 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% loss in inductance. Ensure the inductor selected can handle the maximum operating current. When saturation current is specified, make sure that there is enough margin that the peak current will not saturate the inductor. The size requirements refer to the area and height requirements that are necessary to fit a particular design. Please refer to the inductor dimensions on their datasheet. DC resistance is also important. While DCR is inversely proportional to size, DCR can represent a significant efficiency loss. Refer to the “Efficiency Considerations” March 2007 ⎞ ⎟⎟ × 100 ⎠ 100 EFFICIENCY (%) 95 90 85 80 Efficiency vs. Output Current 4.2VIN 5VIN 75 70 65 60 55 50 0 3.3VOUT 0.1 0.2 0.3 0.4 0.5 0.6 OUTPUT CURRENT (A) Figure 2. Efficiency Curve 7 M9999-031907 Micrel, Inc. MIC2202 The shaded region, 200mA to 500mA, efficiency loss is dominated by MOSFET RDS(ON) and inductor DC losses. Higher input supply voltages will increase the Gate-toSource threshold on the internal MOSFETs, reducing the internal RDS(ON). 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; LPD = IOUT2 × DCR From that, the loss in efficiency due to inductor resistance can be calculated as follows: ⎡ ⎛ VOUT × IOUT Efficiency Loss = ⎢1 − ⎜⎜ V ⎣⎢ ⎝ OUT × IOUT + L PD These values can be interchanged (i.e. 1µH inductor and a 2.2µF capacitor). The trade off between changing these values is that with a larger inductor, there is a reduced peak-to-peak current which yields a greater efficiency at lighter loads. A larger output capacitor will improve transient response by providing a larger hold up reservoir of energy to the output. Feedback The MIC2202 provides a feedback pin to adjust the output voltage to the desired level. This pin connects internally to an error amplifier. The error amplifier then compares the voltage at the feedback to the internal 0.5V reference voltage and adjusts the output voltage to maintain regulation. To calculate the resistor divider network for the desired output is as follows: ⎞⎤ ⎟⎥ × 100 ⎟ ⎠⎦⎥ R2 = 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. Alternatively, under lighter loads, the ripple current due to the inductance becomes a significant factor. When light load efficiencies become more critical, a larger inductor value maybe desired. Larger inductances reduce the peak-to-peak ripple current which minimize losses. The following graph illustrates the effects of inductance value at light load. 100 4.7µH EFFICIENCY (%) 80 1µH 2.2µH 40 20 0 0 1.8VOUT PWM Operation The MIC2202 is a pulse width modulation (PWM) controller. By controlling the ratio of on-to-off time, or duty cycle, a regulated DC output voltage is achieved. As load or supply voltage changes, so does the duty cycle to maintain a constant output voltage. In cases where the input supply runs into a dropout condition, the MIC2202 will run at 100% duty cycle. The MIC2202 provides constant switching at 2MHz with synchronous internal MOSFETs. The internal MOSFETs include a high-side P-Channel MOSFET from the input supply to the switch pin and an N-Channel MOSFET from the switch pin to ground. Since the low-side NChannel MOSFET provides the current during the off cycle, a free wheeling Schottky diode from the switch node to ground is not required. 25 50 75 100 OUTPUT CURRENT (mA) Figure 3. Efficiency vs. Inductance Compensation The MIC2202 is an internally compensated, voltage mode buck regulator. Voltage mode is achieved by creating an internal 2MHz ramp signal and using the output of the error amplifier to pulse width modulate the switch node, maintaining output voltage regulation. With a typical gain bandwidth of 200kHz, the MIC2202 is capable of extremely fast transient responses. The MIC2202 is designed to be stable with a 2.2µH inductor and a 1µF ceramic (X5R) output capacitor. March 2007 ⎛ VOUT ⎞ ⎜⎜ − 1⎟⎟ ⎝ VREF ⎠ Where VREF is 0.5V and VOUT is the desired output voltage. A 10kΩ or lower resistor value from the output to the feedback is recommended. Larger resistor values require an additional capacitor (feed-forward) from the output to the feedback. The large high side resistor value and the parasitic capacitance on the feedback pin (~10pF) can cause an additional pole in the loop. The additional pole can create a phase loss at high frequency. This phase loss degrades transient response by reducing phase margin. Adding feed-forward capacitance negates the parasitic capacitive effects of the feedback pin. A minimum 1000pF capacitor is recommended for feed-forward capacitance. Also, large feedback resistor values increase the impedance, making the feedback node more susceptible to noise pick-up. A feed-forward capacitor would also reduce noise pick-up by providing a low impedance path to the output. Efficiency vs. Inductance 60 R1 8 M9999-031907 Micrel, Inc. MIC2202 PWM control provides fixed frequency operation. By maintaining a constant switching frequency, predictable fundamental and harmonic frequencies are achieved. Other methods of regulation, such as burst and skip modes, have frequency spectrums that change with load that can interfere with sensitive communication equipment. creates the ability to either shift the harmonics away from sensitive carrier and IF frequency bands or to accurately filter out specific harmonic frequencies. The Sync_Out function pin allows for the ability to be able to sync up multiple MIC2202s in a “daisy-chain”, connecting Sync_Out to Sync_In of the other MIC2202. Synchronizing multiple MIC2202s benefits much in the same way as syncing up one MIC2202. All regulators will run at the same fundamental frequency, resulting in matched harmonic frequencies, simplifying designing for sensitive communication equipment. Synchronization Sync_In allows the user to change the frequency from 2MHz up to 2.5MHz or down to 1.6MHz. This allows the ability to control the fundamental frequency and all the resultant harmonics. Maintaining a predictable frequency MIC2202 “Master” VIN SW BIAS SYNC_IN SYNC_OUT FB MIC2202 “Slave” VIN SW BIAS SYNC_IN SYNC_OUT FB Figure 4. Master-Slave Operation Figure 5. Master-Slave Synchronization Waveforms March 2007 9 M9999-031907 Micrel, Inc. MIC2202 MIC2202BMM with 2.2µH Inductor and 1µF Output Capacitor 50 Phase 60 180 50 144 40 30 108 20 72 10 36 0 -10 -20 5VIN 1.8VOUT L = 1µH C = 2.2µF 0 -36 -72 252 216 Gain Phase 180 144 30 108 20 72 10 0 -10 -20 36 5VIN 1.8VOUT L = 1µH C = 2.2µF 0 -36 -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) FREQUENCY (Hz) EFFICIENCY (%) 85 100 4.2VIN 95 90 Efficiency 2.5VOUT Efficiency 3.3V OUT 95 5VIN 80 L = 2.2µH COUT = 1µF 75 70 65 60 0 3.6VIN 80 L = 2.2µH COUT = 1µF 75 70 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 60 0 0.6 Efficiency 1.5VOUT 85 80 75 0.6 4.2VIN 3.6VIN 70 65 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 3VIN 90 60 0 L = 2.2µH COUT = 1µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 Efficiency 1.2VOUT 100 95 95 3VIN 90 EFFICIENCY (%) EFFICIENCY (%) 95 4.2VIN 65 100 4.2VIN 85 80 75 L = 2.2µH 70 C OUT = 1µF 65 60 0 3VIN 90 85 Efficiency 1.8VOUT 100 EFFICIENCY (%) 100 EFFICIENCY (%) GAIN (dB) 40 216 Bode Plot PHASE (°) Gain 70 GAIN (dB) 60 252 PHASE (°) Bode Plot 70 3.6VIN 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) March 2007 3VIN 90 4.2VIN 85 80 75 L = 2.2µH 70 C OUT = 1µF 3.6VIN 65 0.6 60 0 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 10 0.6 M9999-031907 Micrel, Inc. MIC2202 MIC2202BMM with 2.2µH Inductor and 1µF Output Capacitor L1 2.2µH VIN MIC2202BMM C1 1µF 2 VOUT 600mA C3 1µF 1 VIN VSW 5 EN FB 4 SYNC_OUT GND 10 3 SYNC_IN GND 9 7 BIAS GND 8 R1 10k 6 R2 see BOM for values C2 0.01µF GND GND Figure 6. MIC2202BMM Schematic Bill of Materials Item C1, C3 C2 L1 Part Number Manufacturer 06036D105MAT2 AVX GRM185R60J105KE21D Murata 0201ZD103MAT2 GRM033R10J103KA01D LQH32CN2R2M53K R1 CDRH2D14-2R2 CRCW04021002F Qty. (2) 1µF Ceramic Capacitor X5R, 6.3V, Size 0603 2 AVX(1) 10nF Ceramic Capacitor 6.3V, Size 0201 (2) Murata(2) 2.2µH Inductor 97mΩ (3.2mmx2.5mmx1.55mm) (3) 2.2µH Inductor 94mΩ (3.2mmx3.2mmx1.55mm) Sumida Vishay-Dale(4) 1.78kΩ 1%, Size 0402 For 3.3VOUT 2.49kΩ 1%, Size 0402 For 2.5VOUT Vishay-Dale CRCW04027151F 7.15kΩ 1%, Size 0402 For 1.2VOUT CRCW04021002F 10kΩ 1%, Size 0402 For 1VOUT MIC2202BMM Open Micrel, Inc. 1 4.99kΩ 1%, Size 0402 For 1.5VOUT N/A U1 1 3.83kΩ 1%, Size 0402 For 1.8VOUT (4) (5) 1 10kΩ 1%, Size 0402 CRCW04022491F CRCW04024991F 1 10nF Ceramic Capacitor 6.3V, Size 0202 Murata CRCW04021781F CRCW04023831F R2 Description (1) For 0.5VOUT 2MHz High Efficiency Synchronous Buck Regulator 1 Notes: 1. AVX: www.avx.com 2. Murata: www.murata.com 3. Sumida: www.sumida.com 4. Vishay-Dale: www.vishay.com 5. Micrel, Inc.: www.micrel.com March 2007 11 M9999-031907 Micrel, Inc. MIC2202 MIC2202BMM with 1µH Inductor and 2.2µF Output Capacitor Phase 180 50 144 40 30 108 20 72 10 36 0 0 -10 -20 5VIN 1.8VOUT L = 1µH -36 -72 252 216 Gain Phase 180 144 30 108 20 72 10 36 0 -10 -20 0 3.6VIN 1.8VOUT L = 1µH -36 -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) FREQUENCY (Hz) EFFICIENCY (%) 100 4.2VIN 95 5VIN 80 L = 1µH COUT = 2.2µF 75 70 65 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 85 75 L = 1µH COUT = 2.2µF 4.2VIN 70 85 80 4.2VIN 70 65 60 3.6VIN 55 L = 1µH COUT = 2.2µF 50 45 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) March 2007 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 75 70 65 3VIN 4.2VIN 3.6VIN 60 55 50 45 40 0 L = 1µH COUT = 2.2µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 Efficiency 1.2VOUT 90 EFFICIENCY (%) EFFICIENCY (%) 3.6VIN 80 60 0 0.6 3VIN 75 40 0 80 90 Efficiency 1.5VOUT 85 80 85 65 60 0 90 90 3VIN 95 90 85 Efficiency 1.8VOUT Efficiency 2.5VOUT Efficiency 3.3V OUT 100 EFFICIENCY (%) GAIN (dB) 40 60 EFFICIENCY (%) 50 216 Bode Plot PHASE (°) Gain 70 GAIN (dB) 60 252 PHASE (°) Bode Plot 70 4.2VIN 75 70 65 60 3.6VIN 55 50 45 0.6 3VIN 40 0 L = 1µH COUT = 2.2µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 12 0.6 M9999-031907 Micrel, Inc. MIC2202 MIC2202BMM with 1µH Inductor and 2.2µF Output Capacitor VIN MIC2202BMM C1 1µF 2 1 VIN VSW 5 EN FB 4 SYNC_OUT GND 10 3 SYNC_IN GND 9 7 BIAS GND 8 L1 1µH VOUT 600mA C3 2.2µF R1 10k 6 R2 see BOM for values C2 0.01µF GND GND Figure 7. MIC2202BMM Schematic Bill of Materials Item C1 C2 C3 L1 Part Number Manufacturer 06036D105MAT2 AVX GRM185R60J105KE21D Murata 0201ZD103MAT2 GRM033R10J103KA01D 06036D225MAT2 GRM033R10J103KA01D LQH32CN1R0M53K R1 CDRH2D14-2R2 CRCW04021002F Qty. (2) 1µF Ceramic Capacitor X5R, 6.3V, Size 0603 1 AVX(1) 10nF Ceramic Capacitor 6.3V, Size 0201 (2) AVX(1) 2.2µF Ceramic Capacitor X5R, 6.3V, Size 0603 (2) Murata Murata(2) Sumida Vishay-Dale(4) 10kΩ 1%, Size 0402 CRCW04022491F 2.49kΩ 1%, Size 0402 For 2.5VOUT Vishay-Dale 1 3.83kΩ 1%, Size 0402 For 1.8VOUT (4) 1 4.99kΩ 1%, Size 0402 For 1.5VOUT 7.15kΩ 1%, Size 0402 For 1.2VOUT 10kΩ 1%, Size 0402 For 1VOUT CRCW04021002F N/A MIC2202BMM 1 1.5µH Inductor 63mΩ (3.2mmx3.2mmx1.55mm) CRCW04027151F U1 1 1µH Inductor 60mΩ (3.2mmx2.5mmx1.55mm) (3) 1.78kΩ 1%, Size 0402 For 3.3VOUT CRCW04024991F 1 10nF Ceramic Capacitor 6.3V, Size 0202 Murata CRCW04021781F CRCW04023831F R2 Description (1) Open (5) Micrel, Inc. For 0.5VOUT 2MHz High Efficiency Synchronous Buck Regulator 1 Notes: 1. AVX: www.avx.com 2. Murata: www.murata.com 3. Sumida: www.sumida.com 4. Vishay-Dale: www.vishay.com 5. Micrel, Inc.: www.micrel.com March 2007 13 M9999-031907 Micrel, Inc. MIC2202 MIC2202BMM with 4.7µH Inductor and 1µF Output Capacitor PHASE (°) 70 252 60 216 Gain 50 180 Phase 40 144 30 108 20 72 10 36 0 0 -10 3.6VIN -36 1.8VOUT -20 -72 L = 4.7µH -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) Efficiency 3.3V OUT 100 4.2VIN 95 90 EFFICIENCY (%) EFFICIENCY (%) 95 5VIN 85 L = 4.7µH COUT = 1µF 80 75 70 0 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 85 80 4.2VIN 3.6VIN 75 L = 4.7µH COUT = 1µF 70 60 0 0.6 80 0.6 3VIN 75 70 65 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 4.2VIN 85 60 0 L = 4.7µH COUT = 1µF 3.6VIN 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 Efficiency 1.2VOUT 4.2VIN 90 EFFICIENCY (%) EFFICIENCY (%) 90 95 90 85 80 3VIN 75 60 0 3VIN 90 Efficiency 1.5VOUT 65 95 65 95 70 Efficiency 1.8VOUT Efficiency 2.5V OUT EFFICIENCY (%) 100 Bode Plote GAIN (dB) PHASE (°) GAIN (dB) Bode Plot 70 252 60 216 Gain 50 180 Phase 40 144 30 108 20 72 10 36 0 0 -10 5VIN -36 -20 1.8VOUT -72 L = 4.7µH -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) L = 4.7µH COUT = 1µF 3.6VIN 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) March 2007 0.6 4.2VIN 85 80 75 3VIN 70 L = 4.7µH 65 COUT = 1µF 60 0 3.6VIN 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 14 0.6 M9999-031907 Micrel, Inc. MIC2202 MIC2202BMM with 4.7µH Inductor and 1µF Output Capacitor L1 4.7µH VIN MIC2202BMM C1 1µF 2 VOUT 600mA C3 1µF 1 VIN VSW 5 EN FB 4 SYNC_OUT GND 10 3 SYNC_IN GND 9 7 BIAS GND 8 R1 10k 6 R2 see BOM for values C2 0.01µF GND GND Figure 8. MIC2202BMM Schematic Bill of Materials Item C1, C3 C2 L1 Part Number Manufacturer 06036D105MAT2 AVX GRM185R60J105KE21D Murata 0201ZD103MAT2 GRM033R10J103KA01D LQH32CN4R7M53K R1 CDRH2D14-4R7 CRCW04021002F Qty. (2) 1µF Ceramic Capacitor X5R, 6.3V, Size 0603 2 AVX(1) 10nF Ceramic Capacitor 6.3V, Size 0201 (2) Murata(2) 4.7µH Inductor 150mΩ (3.2mmx2.5mmx1.55mm) (3) 4.7µH Inductor 169mΩ (3.2mmx3.2mmx1.55mm) Sumida Vishay-Dale(4) 1.78kΩ 1%, Size 0402 For 3.3VOUT 2.49kΩ 1%, Size 0402 For 2.5VOUT Vishay-Dale CRCW04027151F 7.15kΩ 1%, Size 0402 For 1.2VOUT CRCW04021002F 10kΩ 1%, Size 0402 For 1VOUT MIC2202BMM Open Micrel, Inc. 1 4.99kΩ 1%, Size 0402 For 1.5VOUT N/A U1 1 3.83kΩ 1%, Size 0402 For 1.8VOUT (4) (5) 1 10kΩ 1%, Size 0402 CRCW04022491F CRCW04024991F 1 10nF Ceramic Capacitor 6.3V, Size 0202 Murata CRCW04021781F CRCW04023831F R2 Description (1) For 0.5VOUT 2MHz High Efficiency Synchronous Buck Regulator 1 Notes: 1. AVX: www.avx.com 2. Murata: www.murata.com 3. Sumida: www.sumida.com 4. Vishay-Dale: www.vishay.com 5. Micrel, Inc.: www.micrel.com March 2007 15 M9999-031907 Micrel, Inc. MIC2202 MIC2202BMM with 1µH Inductor and 4.7µF Output Capacitor Phase 180 50 144 40 30 108 20 72 10 36 0 0 -10 -20 5VIN 1.8VOUT L = 1µH -36 -72 252 216 Gain 180 Phase 144 30 108 20 72 10 36 0 0 3.6VIN 1.8VOUT L = 1µH -10 -20 -36 -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) FREQUENCY (Hz) EFFICIENCY (%) -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 100 95 90 85 80 75 70 65 60 55 50 0 Efficiency 3.3V OUT 100 4.2VIN 95 5VIN L = 1µH COUT = 4.7µF EFFICIENCY (%) GAIN (dB) 40 60 3VIN 85 80 90 85 80 75 3.6VIN 4.2VIN 70 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 60 0 0.6 Efficiency 1.5VOUT L = 1µH COUT = 4.7µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 75 70 65 60 55 50 45 40 0 3.6VIN 4.2VIN 3VIN L = 1µH COUT = 4.7µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 Efficiency 1.2V OUT 90 4.2VIN 85 75 70 3VIN 65 3.6VIN 60 55 50 L = 1µH COUT = 4.7µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) March 2007 85 EFFICIENCY (%) 80 EFFICIENCY (%) 90 65 90 45 40 0 Efficiency 1.8VOUT Efficiency 2.5V OUT EFFICIENCY (%) 50 216 Bode Plot PHASE (°) Gain 70 GAIN (dB) 60 252 PHASE (°) Bode Plot 70 0.6 4.2VIN 80 75 70 65 3VIN 3.6VIN 60 55 50 45 40 0 L = 1µH COUT = 4.7µF 0.1 0.2 0.3 0.4 0.5 0.6 OUTPUT CURRENT (A) 16 M9999-031907 Micrel, Inc. MIC2202 MIC2202BMM with 1µH Inductor and 4.7µF Output Capacitor VIN MIC2202BMM C1 1µF 2 1 VIN VSW 5 EN FB 4 SYNC_OUT GND 10 3 SYNC_IN GND 9 7 BIAS GND 8 L1 1µH VOUT 600mA C3 4.7µF R1 10k 6 R2 see BOM for values C2 0.01µF GND GND Figure 9. MIC2202BMM Schematic Bill of Materials Item C1 C2 C3 L1 Part Number Manufacturer 06036D105MAT2 AVX GRM185R60J105KE21D Murata 0201ZD103MAT2 GRM033R10J103KA01D 06036D475MAT2 GRM033R10J103KA01D LQH32CN1R0M53K R1 CDRH2D14-1R5 CRCW04021002F Qty. (2) 1µF Ceramic Capacitor X5R, 6.3V, Size 0603 1 AVX(1) 10nF Ceramic Capacitor 6.3V, Size 0201 (2) AVX(1) 4.7µF Ceramic Capacitor 4V, Size 0201 (2) Murata(2) 1µH Inductor 60mΩ (3.2mmx2.5mmx1.55mm) (3) Vishay-Dale(4) 10kΩ 1%, Size 0402 CRCW04022491F 2.49kΩ 1%, Size 0402 For 2.5VOUT Vishay-Dale 1 4.99kΩ 1%, Size 0402 For 1.5VOUT 7.15kΩ 1%, Size 0402 For 1.2VOUT 10kΩ 1%, Size 0402 For 1VOUT CRCW04021002F N/A MIC2202BMM 1 3.83kΩ 1%, Size 0402 For 1.8VOUT (4) CRCW04027151F U1 1 1.5µH Inductor 63mΩ (3.2mmx3.2mmx1.55mm) 1.78kΩ 1%, Size 0402 For 3.3VOUT CRCW04024991F 1 4.7µF Ceramic Capacitor 6.3V, Size 0202 Murata Sumida 1 10nF Ceramic Capacitor 6.3V, Size 0202 Murata CRCW04021781F CRCW04023831F R2 Description (1) Open (5) Micrel, Inc. For 0.5VOUT 2MHz High Efficiency Synchronous Buck Regulator 1 Notes: 1. AVX: www.avx.com 2. Murata: www.murata.com 3. Sumida: www.sumida.com 4. Vishay-Dale: www.vishay.com 5. Micrel, Inc.: www.micrel.com March 2007 17 M9999-031907 Micrel, Inc. MIC2202 Package Information 10-Pin MSOP (MM) 10-Pin MFL® (ML) March 2007 18 M9999-031907 Micrel, Inc. MIC2202 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. © 2004 Micrel, Incorporated. March 2007 19 M9999-031907