MIC38300 Evaluation Board 3A HELDO™ High Efficiency Low Dropout Regulator General Description The MIC38300 is a 3A peak, 2.2A continuous current step down converter and the first device in a new generation of HELDO™ (High Efficiency Low Dropout) regulators providing the benefits of LDOs in respect to ease of use, fast transient performance, high PSRR and low noise while offering the efficiency of a switching regulator. Requirements The MIC38300 Evaluation board requires an input power supply able to provide greater than 3A at 3V. Precautions The evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN (J1) terminal may damage the device. The MIC38300 evaluation board is tailored for a low voltage input supply range. It should not exceed 5.5V on the input. Getting Started Connect an external supply to VIN. Apply desired input voltage to the VIN (J1) and ground (J2 and J6) terminals of the evaluation board, paying careful attention to polarity and supply voltage (3.0V ≤ 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. Revisions There are two revisions of the MIC38300 Evaluation Board. The new, second revision, of the MIC38300 evaluation board has the label “BD#070507” on the lower left hand corner of the back side. The first revision has the label “040507 MAJ” located at the same corner. Ordering Information Part Number Description MIC38300HYHL EV Evaluation board with MIC38300HYHL adjustable device. ____________________________________________________________________________________________________________ Evaluation Board Schematic Revision 2 (BD#070507) October 2008 M9999-102708-B Micrel, Inc. MIC38300 Evaluation Board Bill of Materials Revision 2 (BD#070507) Item Part Number Manufacturer 06036D106KMAT2A AVX(1) JMK107BJ106MA-T Taiyo Yuden(5) C1608X5R0J106K TDK(3) GRM188R60J106M Murata(2) C1608X5R0J105K TDK(3) 06036D105KAT2A AVX(1) GRM188R60J105KE19D Murata(2) VJ0603G105KXYAT Vishay(4) CRCW06038061FRT1 Vishay(4) C1, C3, C4, C14, C23 C2 R1 R2, R4 CRCW06031002KEYE3 R3 CRCW06032492FRT1 U1 MIC38300-HYHL (4) Vishay (4) Vishay Micrel, Inc. Description Qty. 10uF, 6.3V X5R Ceramic Capacitor 1 10uF, 6.3V X5R Ceramic Capacitor 1 8k, 1%, 1/10W, 0603 1 10k, 1%, 1/10W, 0603 2 24.9k, 1%, 1/10W, 0603 (6) 28-Pin 4mm x 6mm MLF 1 ® 1 Notes: 1. AVX: www.avx.com 2. Murata: www.murata.com 3. TDK: www.tdk.com 4. Vishay: www.vishay.com 5. Taiyo Yuden: www.t-yuden.com 6. Micrel, Inc.: www.micrel.com October 2008 M9999-102708-B Micrel, Inc. MIC38300 Evaluation Board PCB Layout Revision 2 (BD#070507) Top Bottom October 2008 M9999-102708-B Micrel, Inc. MIC38300 Evaluation Board Evaluation Board Revision 1 (040507 MAJ) Schematic Bill of Materials Revision 1 (040507 MAJ) Item Part Number 06036D106KMAT2A R2, R4 C1608X5R0J106K TDK(3) GRM188R60J106M Murata(2) C1608X5R0J105K TDK(3) 06036D105KAT2A AVX(1) GRM188R60J105KE19D Murata(2) VJ0603G105KXYAT Vishay(4) CRCW06038061FRT1 Vishay(4) CRCW06031002KEYE3 R3 CRCW06032492FRT1 U1 MIC38300-HYHL Qty. 10uF, 6.3V X5R Ceramic Capacitor 1 10uF, 6.3V X5R Ceramic Capacitor 1 8k, 1%, 1/10W, 0603 1 10k, 1%, 1/10W, 0603 2 AVX Taiyo Yuden(5) R1 Description (1) JMK107BJ106MA-T C1, C3, C4 C2 Manufacturer (4) Vishay (4) Vishay Micrel, Inc. 24.9k, 1%, 1/10W, 0603 (6) 28-Pin 4mm x 6mm MLF 1 ® 1 Notes: 1. AVX: www.avx.com 2. Murata: www.murata.com 3. TDK: www.tdk.com 4. Vishay: www.vishay.com 5. Taiyo Yuden: www.t-yuden.com 6. Micrel, Inc.: www.micrel.com October 2008 M9999-102708-B Micrel, Inc. MIC38300 Evaluation Board PCB Layout Revision 1 (040507 MAJ) Top Bottom October 2008 M9999-102708-B Micrel, Inc. MIC38300 Evaluation Board 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. © 2007 Micrel, Incorporated. October 2008 M9999-102708-B