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MIC2203 Dataheets PDF



Part Number MIC2203
Manufacturers Micrel Semiconductor
Logo Micrel Semiconductor
Description High Efficiency 1MHz Synchronous Buck Regulator
Datasheet MIC2203 DatasheetMIC2203 Datasheet (PDF)

www.DataSheet4U.com MIC2203 Evaluation Board High Efficiency 1MHz Buck Converter General Description The MIC2203 is an ultra-high efficiency, high frequency synchronous buck (step-down) switching regulator. Efficiencies above 90% are easily obtainable for a wide variety of applications. In addition, the MIC2203 has a logic compatible-enable function, which provides near “zero” OFF mode quiescent current for power critical battery applications. The MIC2203 operates from 2.3V to 5.5V input and f.

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www.DataSheet4U.com MIC2203 Evaluation Board High Efficiency 1MHz Buck Converter General Description The MIC2203 is an ultra-high efficiency, high frequency synchronous buck (step-down) switching regulator. Efficiencies above 90% are easily obtainable for a wide variety of applications. In addition, the MIC2203 has a logic compatible-enable function, which provides near “zero” OFF mode quiescent current for power critical battery applications. The MIC2203 operates from 2.3V to 5.5V input and features internal power MOSFETs that can supply up to 300mA output current. It can operate with a maximum duty cycle of 100% for low-dropout conditions and regulate output voltages down to 0.5V. The MIC2203 is a constant frequency pulse width modulation (PWM) buck converter that maintains high efficiency even at light load currents. By maintaining a constant PWM frequency, RF interference is kept down to a minimum. The MIC2203 has a SYNC_IN pin and SYNC_OUT function, which can be used to synchronize the MIC2203 to an external clock or used in combination with other MIC2203s to daisy chain multiple converters to a single clock. Requirements The MIC2203 evaluation board requires an input power source that is able to deliver greater than 1A at 2.3V. Precautions The evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN terminal may damage the device. In addition, the maximum operating voltage of the MIC2203 evaluation board is 5.5V. Exceeding 6V on the input could damage the device. Getting Started 1. Connect an external supply to VIN. Apply desired input voltage to the VIN (+Vin) and ground (Gnd) terminals of the evaluation board, paying careful attention to polarity and supply voltage (2.3V≤VIN≤5.5V). An ammeter may be placed between the input supply and the VIN terminal to the evaluation board. Ensure that the supply voltage is monitored at the VIN terminal. The ammeter and/or power lead resistance can reduce the voltage supplied to the input. 2. Connect the load to the VOUT and ground terminals. The load can be either passive (resistor) or active (electronic load). An ammeter can be placed between the load and the VOUT (+Vo) terminal. The default output voltage is set to 1.8V. This can be adjusted by changing the feedback resistors. See “Output Voltage. 3. Enabling the MIC2203. If an R5 resistor is on the evaluation board, a 2.3V or greater voltage must be applied to the VIN terminal to enable the device. Conversely, if an R5 resistor is not on the evaluation board, a 1.3V or greater voltage must be applied to the enable (En) terminal to enable the device. March 2005 Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax 1 (408) 474-1000 • http://www.micrel.com M9999-032305 (408) 955-1690 Micrel, Inc. MIC2203 Evaluation Board Output Voltage The output voltage on the MIC2203 evaluation board is adjustable. The output voltage is controlled by the feedback resistors (R1 and R2) and can be calculated as follows: R1 + 1) VOUT = 0.5V x ( R2 The evaluation board is initially adjusted to 1.8V, but can easily be modified by removing R2 and replacing it with the value that yields the desired output voltage. (Removing R2 sets the output to 0.5V.) R2 = ( VOUT 0.5V - 1) SYNC_IN SYNC_IN is an input that allows the MIC2203 to synchronize its internal switching frequency to an external frequency source. The source must have sufficient amplitude (down below 0.7V and above 1.7V). Again, careful attention should be paid to avoid driving this pin above 5.5V. The range of synchronization is around 20% of the fundamental frequency. This pin can be tied high (to VIN) to reduce the oscillator to its minimum frequency. When not in use, this pin should be tied to ground. The evaluation board accomplishes this through a 10kΩ resistor (R4). SYNC_OUT SYNC_OUT is an open collector output that tracks the internal oscillator. A 10kΩ pull-up resistor is required to use the SYNC_OUT function. The R3 location is reserved for this option. Applying the SYNC_OUT signal to the SYNC_IN pin of another MIC2203 converter allows both devices to run at the same frequency. March 2005 2 M9999-032305 (408) 955-1690 Micrel, Inc. MIC2203 Evaluation Board U1 MIC2203BMM J1 VIN R3 OPEN J7 EN J3 SYNC_OUT J4 SYNC_IN R4 J2 GND 2 C1 10µF/6.3V R5 5 4 3 EN SYNC_OUT SYNC_IN FB GND GND 6 10 9 VIN VSW 1 L1 10µH C2 2.2µF/6.3V 1.8VOUT @600mA J5 VOUT R1 7 BIAS C3 0.01µF GND 8 R2 J6 GND Bill of Material MIC2203 Evaluation Board Ref Des C1 C2 C3 L1 R1 R2 R3 R4 R5 U1 Notes: 1. 2. 3. 4. 5. 6. Part Number GRM21BR60J106KE19L C2012X5R0J106K VJ0805G106KXQCW1BC 08056D106KAT C2012X5R1A225K 0603D225KAT VJ08055G225KXQCW1BC GRM185R60J225KE26D VJ0603Y103KXXAT LQH32CN100K33 VLF3010AT-100MR49 SD3812-100 CRCW06031002FRT1 CRCW06033921FRT1 OPEN CRCW06031002FRT1 CRCW06031002FRT1 MIC2203BMM Description 10µF/6.3V Ceramic Capacitor, Size 0805 10µF/6.3V Ceramic Capacitor, Size 0805 10µF/6.3V Ceramic Ca.


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