MIC23156 Evaluation Board 1.5A, 3MHz Synchronous Buck Regulator 2 with HyperLight Load and I C Control for Dynamic Voltage Scaling General Description Getting Started The MIC23156 evaluation board allows the customer to 1. Connect an external supply to the V (J1) and GND IN evaluate a fully-integrated 1.5A, 3MHz synchronous buck (J2) terminals. regulator that features HyperLight Load mode, a power With the output of the power supply disabled, set its good (PGOOD) output indicator, a programmable soft- voltage to the desired input test voltage (2.7V V IN 2 start, and an output voltage scaling control through I C. 5.5V). An ammeter may be placed between the input The MIC23156 is highly efficient throughout the output supply and the V (J1) terminal. Be sure to monitor IN current range, drawing just 30A of quiescent current the supply voltage at the V (J1) terminal, as the IN during operation. The ability to dynamically change the ammeter and/or power lead resistance can reduce the 2 output voltage in 10mV steps through I C and maintain voltage supplied to the device. high output voltage accuracy makes the MIC23156 simple 2. Jumper VSEL via TP1. to use and versatile. The MIC23156 is available in both 16- 2 ball, 0.4mm pitch, 1.81mm 1.71mm wafer level chip Pulling VSEL high to V in MLF or VI C in YCS sets CC scale (WLCSP), and 17-pin 2.8mm 2.5mm MLF the default output voltage to 0.8V. Setting VSEL low to packages. GND sets the default output voltage to 1.0V. Requirements 3. Connect a load to the V (J6 in YML and J3 in OUT YCS) and GND (J7 in YML and J4 in YCS) The MIC23156 evaluation board requires a single 10W terminals. power source adjustable from 2.7V to 5.5V. The loads can either be active (electronic load) or passive (resistor), and The load can be either passive (resistive) or active must be able to dissipate 5W. It is ideal, but not essential, (electronic load). An ammeter may be placed between to have an oscilloscope available to view the circuit the load and the output terminal. Make sure the output waveforms. The simplest tests require two voltage meters voltage is monitored at the V terminal. The board is OUT to measure input and output voltages. Efficiency also equipped with a 2-pin connector (JP2) to allow for measurements require two voltage meters and two output voltage monitoring. ammeters to prevent errors caused by measurement 4. Enable the MIC23156 via TP2. inaccuracies. To enable the MIC23156, jumper TP2 to V in YML or CC 2 To use the dynamic voltage scaling feature, an I C serial V in YCS. To disable the device, jumper TP2 to 2 IN programmer board (MICUSB I C Dongle EV), software GND. An alternative method of enabling and disabling package/kit (available for download online), and a the EN pin is by applying a second power source to computer are necessary. the EN and GND terminals. Do not leave this pin floating. Precautions There is no reverse input protection on this board. Be Ordering Information careful when connecting the input source to ensure correct polarity is observed. Part Number Description 1 1.5A synchronous buck regulator with Datasheets and support documentation are available on ( ) MIC23156-0YML EV 2 I C in a 17-pin 2.8mm 2.5mm MLF. Micrels web site at: www.micrel.com. 1.5A synchronous buck regulator with 2 MIC23156-0YCS EV I C in a 16-ball 1.81mm 1.71mm WLCSP. 2 MICUSB Dongle I C serial programmer board. Note: 1. Contact Micrel Marketing for availability. HyperLight Load is a registered 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. MIC23156 Evaluation Board 2 5. Power Good (J3 in YML). 7. Open and control the MIC23156 via the I C serial programmer interface A power good (PGOOD) test point is provided to monitor the PGOOD function (available only on the Download the software package/kit found on the YML evaluation board). Connect a voltage meter or an MIC23156 product page on Micrels website Open the 2 oscilloscope to the PGOOD pin. I C interface and follow the steps below: 2 2 a. Open the I C serial programmer interface and click 6. Connect the I C serial programmer board (MICUSB 2 Test. The status bar at the bottom of the window I C Dongle evaluation board) to JP1 of the should change from value to Target OK. MIC23156 evaluation board. 2 Make sure the switch on the I C serial programmer board is switched to I2C and not NOM. b. Click the Registers tab and then click Read. The PGOOD status box will automatically be checked if the output voltage regulation is above the PGOOD fault threshold. If the UVLO box is checked, it means the input voltage is too low. If the TSD box is checked, it means the internal die temperature is too high and the device is now in 2 Plug the 9-pin connector of the I C board to JP1 of the thermal shutdown to prevent damage. MIC23156 evaluation board. Take extra care when connecting the two boards together and make sure the 2 GND pins are matched (GND of I C board connects to 2 GND of MIC23156). Then connect the I C serial programmer board to a laptop or desktop using a USB to Mini-B USB type cable. c. Click Offline Mode once and it will toggle to Direct Editing Mode. In direct editing mode, any 2 modifications made in the I C interface, such as enabling/disabling the device, setting a long soft start, or changing the output voltage, will be recognized instantaneously at the VOUT terminal of the MIC23156 evaluation board. Revision 1.1 August 27, 2013 2