MIC2202 Micrel 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. • • • • • • • • • • • • • • • • Input voltage range: 2.3V to 5.5V Output down to 0.5V/600mA 2MHz PWM operation Stable with 1µF ceramic output capcitor. 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 3mm×3mm MLF™-10L package options • –40°C to +125°C junction temperature range 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 pulse- width-modulation (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. 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 The MIC2202 is available in 10-pin MSOP and 3mm × 3mm MLF™-10L package options with an operating junction temperature range from –40°C to +125°C . Typical Application 2.2µH 1 10 2 9 10k SYNC_IN 3 8 4 7 5 6 1µF SYNC_OUT EN 100 10nF Efficiency 3.3VOUT 4.2VIN 95 EFFICIENCY (%) VIN 2.3V to 5.5V VOUT 3.3V 600mA 90 85 5VIN 80 75 70 L = 2.2µH COUT = 1µF 65 1.78k 60 0 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 Adjustable Output Synchronous Buck Converter MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc. Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com May 2004 1 M9999-052104 MIC2202 Micrel Ordering Information Part Number Voltage Temperature Range Package Lead Finish MIC2202BMM Adjustable –40°C to +125°C 10-pin MSOP-10 Standard MIC2202BML Adjustable –40°C to +125°C 10-pin MLF™ Standard MIC2202YMM Adjustable –40°C to +125°C 10-pin MSOP-10 Pb-Free MIC2202YML Adjustable –40°C to +125°C 10-pin MLF™ Pb-Free Pin Configuration SW 1 10 GND VIN 2 9 GND SYNC_IN 3 8 GND SYNC_OUT 4 7 BIAS EN 5 SW 1 10 GND VIN 2 9 GND SYNC_IN 3 8 GND SYNC_OUT 4 7 BIAS EN 5 6 FB MSOP-10 (MM) EP 6 FB MLF™-10 (ML) (Top View) Pin Description Pin Number Pin Name 1 SW Switch (Output): Internal power MOSFET output switches. 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. 8, 9, 10 GND Ground. EP GND Ground, backside pad. M9999-052104 Pin Function SYNC_IN for the MIC2202: Sync the main switching frequency to an external clock. SYNC_OUT an open collector output. 2 May 2004 MIC2202 Micrel Absolute Maximum Ratings(Note 1) Operating Ratings(Note 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 (Note 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 3mm×3mm MLF™-10L (θJA) ............................... 60°C/W Electrical Characteristics(Note 5) TA = 25°C with VIN = 3.5V unless otherwise noted, bold values indicate –40°C < TJ < +125°C Parameter Condition Min Supply Voltage Range Quiescent Current Typ 2.3 Max Units 5.5 V EN = VIN; VFB = 0.55V (not switching) 350 450 µA EN = 0V 0.01 1 µA 0.500 0.5125 V MIC2202 [Adjustable] Feedback 0.4875 Voltage 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 V Bias Regulator Output Voltage 2.2 Maximum Duty Cycle VFB = 0.7V 100 Current Limit VFB = 0.7V 1 Switch ON-Resistance % 1.8 2.5 A VIN = 3.5V, ISW = 300mA VFB = 0.35V 0.650 0.9 Ω VIN = 3.5V, ISW = –300mA VFB = 0.55V 0.550 0.75 Ω 0.01 1 µA 2.5 MHz 1.7 V Enable Input Current Sync Frequency Range 1.6 SYNC_IN Threshold 0.7 Sync Minimum Pulse Width 1 10 SYNC_IN Input Current 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 Note 1. Exceeding the ABSOLUTE MAXIMUM RATINGS may damage device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. Absolute maximum power dissipation is limited by maximum junction temperature where PD(MAX) = (TJ(MAX)–TA) ÷ θJA. Note 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Note 5. Specification for packaged product only. May 2004 3 M9999-052104 MIC2202 Micrel Typical Characteristics Output Voltage vs. Output Current 0.515 0.5025 0.5000 0.4975 2.320 0.1 0.2 0.3 0.4 OUTPUT CURRENT (A) 2.0 0.505 0.500 0.495 0.490 VFB = 0V 0 0 300 2.316 250 2.308 200 IQ (µA) 2.314 150 100 50 2.304 2.302 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 0 Frequency vs. Temperature 0 VFB = 0V 1 2 3 4 5 6 SUPPLY VOLTAGE (V) Enable Threshold vs. Supply Voltage 1.0 2.30 0.9 0.8 Enable On 0.7 0.6 Enable Off 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) M9999-052104 ENABLE THRESHOLD (V) 2.40 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 6 354 352 350 348 346 344 342 340 338 336 334 VIN = 3.6V 332 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 0.9 ENABLE THRESHOLD (V) 2.306 2 4 SUPPLY VOLTAGE (V) Quiescent Current vs. Temperature Quiescent Current vs. Supply Voltage 350 2.31 1.0 0.5 Bias Supply vs. Temperature 2.312 1.5 0.485 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 0.5 IQ (µA) BIAS SUPPLY (V) 2.5 0.510 2.318 FREQUENCY (MHz) VBIAS vs. Supply Voltage VBIAS (V) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 0.5050 0.4950 0 Output Voltage vs. Temperature 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) May 2004 MIC2202 Micrel 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 May 2004 5 M9999-052104 MIC2202 Micrel Functional Description Sync_Out VIN 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 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 Bias 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. 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 10kΩ SYNC_IN SYNC_OUT FB MIC2202 “Slave” VIN SW BIAS SYNC_IN SYNC_OUT FB Figure 1. Master-Slave Operation M9999-052104 6 May 2004 MIC2202 Micrel Applications Information Efficiency Considerations Input Capacitor Efficiency is defined as the amount of useful output power, divided by the amount of power consumed. 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. V ×I Efficiency % = OUT OUT × 100 V × I IN IN 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. 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. 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. 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 feed-forward capacitor from the output to the feedback node should be used to slow the start up time. Inductor Selection 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 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. Efficiency vs. Output Current 100 95 EFFICIENCY (%) 90 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. 85 80 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 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-to-Source 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; 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” below for a more detailed description. 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. LPD = IOUT 2 × DCR From that, the loss in efficiency due to inductor resistance can be calculated as follows: May 2004 7 M9999-052104 MIC2202 Micrel follows: VOUT × IOUT Efficiency Loss = 1– × 100 VOUT × IOUT + LPD 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. Where VREF is 0.5V and VOUT is the desired output voltage. 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 may be 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. 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 feedforward capacitance. Efficiency vs. Inductance 100 4.7µH EFFICIENCY (%) 80 1µH 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. 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. 60 2.2µH 40 20 0 0 R1 VOUT – 1 V REF 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 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 N-Channel MOSFET provides the current during the off cycle, a free wheeling Schottky diode from the switch node to ground is not required. The MIC2202 is designed to be stable with a 2.2µH inductor and a 1µF ceramic (X5R) output capacitor. 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. 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. 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 M9999-052104 8 May 2004 MIC2202 Micrel 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 creates the ability to either shift the harmonics away from sensitive carrier and IF frequency bands or to accurately filter out specific harmonic frequencies. MIC2202 “Master” VIN SW BIAS 10kΩ SYNC_IN SYNC_OUT FB MIC2202 “Slave” VIN SW BIAS SYNC_IN SYNC_OUT FB Slave Switch Mode Master Sync Out Master Switch Mode Figure 4. Master-Slave Operation TIME (400ns/div.) Figure 5. Master-Slave Synchronization Waveforms May 2004 9 M9999-052104 MIC2202 Micrel MIC2202BMM with 2.2µH Inductor and 1µF Output Capacitor 10 0 -10 -20 5VIN 1.8VOUT L = 1µH C = 2.2µF 0 -36 20 10 0 -10 -20 Bode Plot Gain Phase 144 108 72 36 0 3.6VIN 1.8VOUT L = 1µH -36 -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) Load Transient 252 216 180 VOUT 200mV/div 72 36 70 60 50 40 30 L = 2.2µH C = 1µF VIN = 3.6V VOUT = 1.8V IOUT 200mA/div 30 20 144 108 GAIN (dB) Phase 216 180 PHASE (°) Gain 50 40 GAIN (dB) 252 PHASE (°) Bode Plot 70 60 TIME (40µs/div.) Efficiency 3.3VOUT 5VIN 80 L = 2.2µH COUT = 1µF 75 70 65 90 85 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 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) Efficiency 1.2VOUT 95 3VIN EFFICIENCY (%) 90 4.2VIN 85 80 75 L = 2.2µH 70 C OUT = 1µF 3.6VIN 65 0.6 80 75 4.2VIN 3.6VIN 70 L = 2.2µH COUT = 1µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) L = 2.2µH C = 1µF VIN = 3.6V VOUT = 1.8V IOUT = 600mA 3VIN 4.2VIN 85 0.6 Vsw-Vripple 90 80 75 L = 2.2µH 70 C OUT = 1µF 65 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 85 60 0 0.6 3VIN 90 65 100 95 EFFICIENCY (%) 3.6VIN 65 100 60 0 95 4.2VIN VSW 2V/div 60 0 3VIN 60 0 3.6VIN 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 VOUT 20mV/div EFFICIENCY (%) 85 95 Efficiency 1.8VOUT 100 EFFICIENCY (%) 4.2VIN 95 90 Efficiency 2.5VOUT 100 EFFICIENCY (%) 100 TIME (400ns/div.) M9999-052104 10 May 2004 MIC2202 Micrel MIC2202BMM with 2.2µH Inductor and 1µF Output Capacitor L1 2.2µH VIN VOUT 600mA MIC2202BMM C1 1µF GND 2 1 VIN VSW 5 EN FB 4 SYNC_OUT GND 10 3 SYNC_IN GND 9 7 BIAS 8 GND C3 1µF R1 10k 6 R2 see BOM for values C2 0.01µF GND Figure 6. MIC2202BMM Schematic Bill of Materials Item Part Number Manufacturer Description C1, C3 06036D105MAT2 GRM185R60J105KE21D AVX Murata 1uF Ceramic Capacitor X5R, 6.3V, Size 0603 1uF Ceramic Capacitor X5R, 6.3V, Size 0603 2 C2 0201ZD103MAT2 GRM033R10J103KA01D AVX Murata 10nF Cermaic Capacitor 6.3V, Size 0201 10nF Cermaic Capacitor 6.3V, Size 0202 1 L1 LQH32CN2R2M53K CDRH2D14-2R2 Murata Sumida 2.2uH Inductor 97mΩ (3.2mmx2.5mmx1.55mm) 2.2uH Inductor 94mΩ (3.2mmx3.2mmx1.55mm) 1 R1 CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 R2 CRCW04021781F CRCW04022491F CRCW04023831F CRCW04024991F CRCW04027151F CRCW04021002F N/A Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale 1.78kΩ 1%, Size 0402 2.49kΩ 1%, Size 0402 3.83kΩ 1%, Size 0402 4.99kΩ 1%, Size 0402 7.15kΩ 1%, Size 0402 10kΩ 1%, Size 0402 Open U1 MIC2202BMM Micrel, Inc. 2MHz High Efficiency Synchronous Buck Regulator 1. 2. 3. 4. Qty. For 3.3VOUT For 2.5VOUT For 1.8VOUT For 1.5VOUT For 1.2VOUT For 1VOUT For 0.5VOUT 1 1 AVX: www.avx.com Murata: www.murata.com Sumida: www.sumida.com Vishay-Dale: www.vishay.com 5. Micrel, Inc: www.micrel.com May 2004 11 M9999-052104 MIC2202 Micrel MIC2202BMM with 1µH Inductor and 2.2µF Output Capacitor 72 36 10 0 -10 -20 0 -36 5VIN 1.8VOUT L = 1µH 144 108 30 20 72 36 10 0 -10 -20 -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 Phase 0 -36 3.6VIN 1.8VOUT L = 1µH -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) VOUT 200mV/div 30 20 216 180 L = 2.2µH C = 1µF VIN = 3.6V VOUT = 1.8V IOUT 200mA/div 144 108 GAIN (dB) Phase Load Transient 252 Gain 50 40 PHASE (°) GAIN (dB) 216 180 Gain 50 40 Bode Plot 70 60 252 PHASE (°) Bode Plot 70 60 FREQUENCY (Hz) TIME (40µs/div.) Efficiency 2.5VOUT 100 90 85 5VIN 80 L = 1µH COUT = 2.2µF 75 70 65 90 85 75 65 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 60 0 0.6 Efficiency 1.5VOUT 80 75 80 75 4.2VIN 70 65 3.6VIN 60 55 L = 1µH COUT = 2.2µF 50 45 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 3.6VIN 60 55 50 L = 1µH COUT = 2.2µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) L = 2.2µH C = 1µF VIN = 3.6V VOUT = 1.8V IOUT = 600mA L = 1µH COUT = 2.2µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 Vsw-Vripple 3.6VIN 60 55 40 0 4.2VIN 4.2VIN 70 65 50 45 0.6 3VIN 3VIN 70 65 45 40 0 0.6 Efficiency 1.2VOUT 90 85 EFFICIENCY (%) EFFICIENCY (%) L = 1µH COUT = 2.2µF 4.2VIN 70 90 3VIN 85 40 0 3.6VIN 80 80 75 VSW 2V/div 60 0 3VIN 95 EFFICIENCY (%) 4.2VIN Efficiency 1.8VOUT 90 85 VOUT 20mV/div EFFICIENCY (%) 95 Efficiency 3.3VOUT EFFICIENCY (%) 100 0.6 TIME (400ns/div.) M9999-052104 12 May 2004 MIC2202 Micrel MIC2202BMM with 1µH Inductor and 2.2µF Output Capacitor VIN MIC2202BMM C1 1µF GND 2 1 VIN VSW 5 EN FB 4 SYNC_OUT GND 10 3 SYNC_IN GND 9 7 BIAS 8 GND L1 1µH VOUT 600mA C3 2.2µF R1 10k 6 R2 see BOM for values C2 0.01µF GND Figure 7. MIC2202BMM Schematic Bill of Materials Item Part Number Manufacturer Description C1 06036D105MAT2 GRM185R60J105KE21D AVX Murata 1µF Ceramic Capacitor X5R, 6.3V, Size 0603 1µF Ceramic Capacitor X5R, 6.3V, Size 0603 1 C2 0201ZD103MAT2 GRM033R10J103KA01D AVX Murata 10nF Cermaic Capacitor 6.3V, Size 0201 10nF Cermaic Capacitor 6.3V, Size 0202 1 C3 06036D225MAT2 GRM033R10J103KA01D AVX Murata 2.2µF Ceramic Capacitor X5R, 6.3V, Size 0603 2.2µF Ceramic Capacitor X5R, 6.3V, Size 0603 1 L1 LQH32CN1R0M53K CDRH2D14-2R2 Murata Sumida 1µH Inductor 60mΩ (3.2mmx2.5mmx1.55mm) 1.5µH Inductor 63mΩ (3.2mmx3.2mmx1.55mm) 1 R1 CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 1 R2 CRCW04021781F CRCW04022491F CRCW04023831F CRCW04024991F CRCW04027151F CRCW04021002F N/A Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale 1.78kΩ 1%, Size 0402 2.49kΩ 1%, Size 0402 3.83kΩ 1%, Size 0402 4.99kΩ 1%, Size 0402 7.15kΩ 1%, Size 0402 10kΩ 1%, Size 0402 Open U1 MIC2202BMM Micrel, Inc. 2MHz High Efficiency Synchronous Buck Regulator 1. 2. 3. 4. Qty. For 3.3VOUT For 2.5VOUT For 1.8VOUT For 1.5VOUT For 1.2VOUT For 1VOUT For 0.5VOUT 1 1 AVX: www.avx.com Murata: www.murata.com Sumida: www.sumida.com Vishay-Dale: www.vishay.com 5. Micrel, Inc: www.micrel.com May 2004 13 M9999-052104 MIC2202 Micrel MIC2202BMM with 4.7µH Inductor and 1µF Output Capacitor 72 36 10 0 -10 -20 0 -36 5VIN 1.8VOUT L = 4.7µH 20 10 0 -10 -20 Bode Plot Gain Phase 144 108 72 36 0 3.6VIN 1.8VOUT L = 4.7µH -36 -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) Load Transient 252 216 180 VOUT 200mV/div 30 20 70 60 50 40 30 L = 4.7µH C = 1µF VIN = 3.6V VOUT = 1.8V IOUT 200mA/div 144 108 GAIN (dB) Phase PHASE (°) 216 180 Gain 50 40 GAIN (dB) 252 PHASE (°) Bode Plot 70 60 TIME (40µs/div.) Efficiency 3.3VOUT 100 95 EFFICIENCY (%) 5VIN 85 L = 4.7µH COUT = 1µF 80 75 70 0 85 80 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 70 60 0 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 4.2VIN 3VIN 3.6VIN 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 3VIN 75 70 L = 4.7µH COUT = 1µF 3.6VIN 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 Vsw-Vripple 90 80 L = 4.7µH COUT = 1µF 80 60 0 0.6 4.2VIN 85 65 Efficiency 1.2VOUT EFFICIENCY (%) EFFICIENCY (%) L = 4.7µH COUT = 1µF 95 85 60 0 3.6VIN 65 90 65 4.2VIN 75 Efficiency 1.5VOUT 70 90 90 95 75 3VIN 0.6 4.2VIN 85 80 75 VSW 2V/div EFFICIENCY (%) 90 95 EFFICIENCY (%) 4.2VIN 95 Efficiency 1.8VOUT Efficiency 2.5VOUT 3VIN 70 L = 4.7µH 65 COUT = 1µF 60 0 VOUT 20mV/div 100 3.6VIN 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 L = 4.7µH VIN = 3.6V VOUT = 1.8V C = 1µF IOUT = 600mA TIME (400ns/div.) M9999-052104 14 May 2004 MIC2202 Micrel MIC2202BMM with 4.7µH Inductor and 1µF Output Capacitor L1 4.7µH VIN VOUT 600mA MIC2202BMM C1 1µF GND 2 1 VIN VSW 5 EN FB 4 SYNC_OUT GND 10 3 SYNC_IN GND 9 7 BIAS 8 GND C3 1µF R1 10k 6 R2 see BOM for values C2 0.01µF GND Figure 8. MIC2202BMM Schematic Bill of Materials Item Part Number Manufacturer Description C1, C3 06036D105MAT2 GRM185R60J105KE21D AVX Murata 1uF Ceramic Capacitor X5R, 6.3V, Size 0603 1uF Ceramic Capacitor X5R, 6.3V, Size 0603 2 C2 0201ZD103MAT2 GRM033R10J103KA01D AVX Murata 10nF Cermaic Capacitor 6.3V, Size 0201 10nF Cermaic Capacitor 6.3V, Size 0202 1 L1 LQH32CN4R7M53K CDRH2D14-4R7 Murata Sumida 4.7uH Inductor 150mΩ (3.2mmx2.5mmx1.55mm) 4.7uH Inductor 169mΩ (3.2mmx3.2mmx1.55mm) 1 R1 CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 1 R2 CRCW04021781F CRCW04022491F CRCW04023831F CRCW04024991F CRCW04027151F CRCW04021002F N/A Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale 1.78kΩ 1%, Size 0402 2.49kΩ 1%, Size 0402 3.83kΩ 1%, Size 0402 4.99kΩ 1%, Size 0402 7.15kΩ 1%, Size 0402 10kΩ 1%, Size 0402 Open U1 MIC2202BMM Micrel, Inc. 2MHz High Efficiency Synchronous Buck Regulator 1. 2. 3. 4. Qty. For 3.3VOUT For 2.5VOUT For 1.8VOUT For 1.5VOUT For 1.2VOUT For 1VOUT For 0.5VOUT 1 1 AVX: www.avx.com Murata: www.murata.com Sumida: www.sumida.com Vishay-Dale: www.vishay.com 5. Micrel, Inc: www.micrel.com May 2004 15 M9999-052104 MIC2202 Micrel MIC2202BMM with 1µH Inductor and 4.7µF Output Capacitor 144 108 40 30 72 36 10 0 -10 -20 60 50 0 -36 5VIN 1.8VOUT L = 1µH 216 Gain 180 144 Phase 108 72 20 10 0 -10 36 0 3.6VIN 1.8VOUT L = 1µH -36 -20 -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) -72 -30 -108 1x102 1x103 1x104 1x105 1x106 1x107 FREQUENCY (Hz) Load Transient 252 VOUT 200mV/div 30 20 216 180 Bode Plot L = 1µH C = 4.7µF VIN = 3.6V VOUT = 1.8V IOUT 200mA/div Phase 70 PHASE (°) Gain 252 GAIN (dB) GAIN (dB) 50 40 Bode Plot PHASE (°) 70 60 TIME (40µs/div.) 70 65 95 5VIN L = 1µH COUT = 4.7µF 60 55 50 0 90 85 80 75 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 60 0 L = 1µH COUT = 4.7µF 4.2VIN 3VIN 3.6VIN 0.6 80 75 70 65 4.2VIN 3VIN 60 L = 1µH COUT = 4.7µF 55 50 45 40 0 0.6 3.6VIN 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.6 Vsw-Vripple 4.2VIN 80 75 70 65 60 55 50 45 L = 1µH COUT = 4.7µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) 90 85 EFFICIENCY (%) EFFICIENCY (%) 40 0 4.2VIN Efficiency 1.2VOUT 80 75 50 45 3.6VIN 70 Efficiency 1.5VOUT 60 55 3VIN 65 90 85 70 65 90 85 EFFICIENCY (%) 80 75 4.2VIN Efficiency 1.8VOUT Efficiency 2.5VOUT 40 0 3VIN VSW 2V/div 90 85 100 3.6VIN L = 1µH COUT = 4.7µF 0.1 0.2 0.3 0.4 0.5 OUTPUT CURRENT (A) VOUT 20mV/div EFFICIENCY (%) 95 Efficiency 3.3VOUT EFFICIENCY (%) 100 0.6 VIN = 3.6V L = 1µH C = 4.7µF VOUT = 1.8V IOUT = 600mA TIME (400ns/div.) M9999-052104 16 May 2004 MIC2202 Micrel MIC2202BMM with 1µH Inductor and 4.7µF Output Capacitor VIN L1 1µH VOUT 600mA C3 4.7µF R1 10k MIC2202BMM C1 1µF GND 2 1 VIN VSW 5 EN FB 4 SYNC_OUT GND 10 3 SYNC_IN GND 9 7 BIAS 8 GND 6 R2 see BOM for values C2 0.01µF GND Figure 9. MIC2202BMM Schematic Bill of Materials Item Part Number Manufacturer Description C1 06036D105MAT2 GRM185R60J105KE21D AVX Murata 1µF Ceramic Capacitor X5R, 6.3V, Size 0603 1µF Ceramic Capacitor X5R, 6.3V, Size 0603 1 C2 0201ZD103MAT2 GRM033R10J103KA01D AVX Murata 10nF Cermaic Capacitor 6.3V, Size 0201 10nF Cermaic Capacitor 6.3V, Size 0202 1 C3 06036D475MAT2 GRM033R10J103KA01D AVX Murata 4.7µF Cermaic Capacitor 4V, Size 0201 4.7µF Cermaic Capacitor 6.3V, Size 0202 1 L1 LQH32CN1R0M53K CDRH2D14-1R5 Murata Sumida 1µH Inductor 60mΩ (3.2mmx2.5mmx1.55mm) 1.5µH Inductor 63mΩ (3.2mmx3.2mmx1.55mm) 1 R1 CRCW04021002F Vishay-Dale 10kΩ 1%, Size 0402 1 R2 CRCW04021781F CRCW04022491F CRCW04023831F CRCW04024991F CRCW04027151F CRCW04021002F N/A Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale Vishay-Dale 1.78kΩ 1%, Size 0402 2.49kΩ 1%, Size 0402 3.83kΩ 1%, Size 0402 4.99kΩ 1%, Size 0402 7.15kΩ 1%, Size 0402 10kΩ 1%, Size 0402 Open U1 MIC2202BMM Micrel, Inc. 2MHz High Efficiency Synchronous Buck Regulator 1. 2. 3. 4. Qty. For 3.3VOUT For 2.5VOUT For 1.8VOUT For 1.5VOUT For 1.2VOUT For 1VOUT For 0.5VOUT 1 1 AVX: www.avx.com Murata: www.murata.com Sumida: www.sumida.com Vishay-Dale: www.vishay.com 5. Micrel, Inc: www.micrel.com May 2004 17 M9999-052104 MIC2202 Micrel Package Information 3.15 (0.122) 2.85 (0.114) DIMENSIONS: MM (INCH) 4.90 BSC (0.193) 3.10 (0.122) 2.90 (0.114) 1.10 (0.043) 0.94 (0.037) 0.30 (0.012) 0.15 (0.006) 0.26 (0.010) 0.10 (0.004) 0.15 (0.006) 0.05 (0.002) 0.50 BSC (0.020) 6° MAX 0° MIN 0.70 (0.028) 0.40 (0.016) 10-Pin MSOP (MM) DIMENSIONS: mm 0.85 +0.15 –0.05 1.60 +0.15 –0.15 3.00 BSC. 0.80 +0.15 –0.15 1.50 BSC. 0.01 +0.04 –0.01 0.48 typ. PIN 1 ID 0.23 +0.07 –0.05 1 1 1.50 BSC. +0.15 2 1.15 –0.15 2 3.00 BSC. 3 2.30 +0.15 –0.15 3 0.20 dia 0.50 BSC. 0.40 +0.15 –0.05 TOP SEATING PLANE TERMINAL TIP BOTTOM 0.23 +0.07 –0.05 0.50 BSC. 0.01 +0.04 –0.01 0.50 BSC. TERMINAL TIP ODD TERMINAL SIDE EVEN TERMINAL SIDE 10-Pin MLF™ (ML) MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB USA 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2004 Micrel, Incorporated. M9999-052104 18 May 2004