MIC22205YML-EV Microchip

MIC22205 Evaluation Board 2A Integrated Switch High-Efficiency Synchronous Buck Regulator General Description Getting Started The Micrel MIC22205 is a high-efficiency, 2A, integrated 1. V Supplies IN switch, synchronous buck (step-down) regulator. It is Connect the V supply (2.9V to 5.5V) across the VIN IN frequency programmable up to 4MHz. The MIC22205 and PGND terminals. Monitor V at the VIN and PGND IN achieves more than 95% efficiency and switches at terminals with a voltmeter. TP9 is a 4-pin header test 1MHz. The ultra-high-speed control loop keeps the point provided for monitoring VIN. output voltage within regulation even under the extreme 2. Enable transient load swings commonly found in FPGAs and The enable input EN is internally pulled up with a 1A low-voltage ASICs. The output voltage is pre-bias safe current source. and is adjustable down to 0.7V. 3. Monitor Outputs The MIC22205 offers a full range of sequencing and tracking options. The Enable/Delay (EN/DLY) and Monitor the output V with a scope or DVM connected OUT Power Good (PG) inputs allow versatile turn-on and across the VOUT and PGND terminals. TP11 is a 4-pin turn-off sequencing across multiple devices. The Ramp header test point provided for monitoring VOUT. Control (RC) input allows start-up voltage tracking, 4. Output Load either directly or ratio-metrically. Connect a load across the VOUT and PGND terminals. The MIC22205 is available in a 12-pin 3mm x 3mm Use an active or passive load. MLF with a junction operating range from 40C to 5. Turn On the Power +125 C. Turn on the power supply and verify that V = 1.8V. OUT Data sheets and support documentation are available on the Micrel web site: www.micrel.com. Ordering Information Requirements The MIC22205YML EV requires a power supply of 2.9V Part Number Description to 5.5V, and a test load. Make sure that the power supply can provide the wattage needed for the chosen MIC22205YML EV Evaluation Board for the MIC22205YML test load. The load can be active (electronic load) or passive (resistor). Additionally, monitor the Power Good output (PG) with a multimeter or an oscilloscope. Precautions There is no reverse input protection on this board. While connecting supplies and signals, make sure that correct polarities are observed. Ramp Control is a trademark of Micrel, Inc. 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 Micrel, Inc. MIC22205 Evaluation Board Evaluation Board Features Ramp Control (RC) See the MIC22205YML Data Sheet for detailed Ramp control allows slowing the slew rate of the explanations of these functions. MIC22205 output. Increase the value of capacitor C6 to Enable/Delay (EN/DLY) reduce the slew rate. Enable/Delay allows delayed turn-on of the MIC22205. 0.7 C 6 Install a capacitor in location C7 to increase the start-up t = RAMP delay of the MIC22205. 6 1 10 1.24 C 7 t = EN/DLY 6 Power On Reset Output (POR) 1 10 Open drain output POR pulls low when the output voltage of the MIC22205 is out of specification. POR is pulled up to V by a 47.5k resistor. IN Switch Voltage (V ) SW Test point V is provided to monitor the internal SW switching node. V is isolated from the switch node by SW 49.9 resistor R7. TP10 is a 2-pin header test point provided for monitoring switch voltage. September 2012 2 M9999-092112-A