MIC5338/9 Evaluation Board Dual 300mA μCap LDO in 1.6mm x 1.6mm Thin MLF® General Description The MIC5338/9 is an advanced, dual LDO ideal for powering general purpose portable devices. The MIC5338/9 provides two independently controlled, high performance 300mA LDOs in a tiny 1.6mm x 1.6mm Thin MLF® package. When the MIC5339 is disabled an internal resistive load is automatically applied to the output to discharge the output capacitor. Ideal for battery powered applications, the MIC5338/9 offers two low noise outputs and low quiescent current of 70μA when both outputs are enabled. An input capacitor may be required when the power supply is more than four inches from the device. The evaluation board includes an input capacitor of 10μF to compensate for long inductive test leads. Requirements The MIC5338/9 evaluation board requires an input power supply that is able to deliver at least 650mA at a voltage within the range of 2.5V to 5.5V. The output load can be either active or passive. Precautions The evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN terminal may damage the device. Getting Started 1. Connect an External Supply to VIN. Apply the desired input voltage to the VIN (J1) and ground terminal (J2) of the evaluation board, paying careful attention to polarity and supply voltage (2.5V ≤ VIN ≤ 5.5V). An ammeter may be placed between the input supply and the VIN terminal of the evaluation board. Ensure that the supply voltage is monitored at the VIN terminal. The ammeter and power lead resistance can reduce the voltage supplied to the input. 2. Enable/Disable the MIC5338/9. The evaluation board is configured for “Default Disable” with 100KΩ pull down resistors on the enable pins to GND. To enable the MIC5338/9 jumper the enable terminal (J7 for LDO1 and J8 for LDO2) to VIN. To disable the output, simply remove the jumper from the EN terminal. The enable pin must be either pulled high or low for proper operation. Removing the pull-down resistors and leaving the pins floating will cause the regulators to operate in an indeterminate state. 3. Connect the Load to the VOUT Terminals. Connect a load to the output of LDO1 (J3) and GND (J6). Connect a load to the output of LDO2 (J5) and GND (J4). The load can be either a passive (resistor) or active (electronic load). Be sure to monitor the output voltage at the VOUT (J3, J5) terminals. Ordering Information Part Number Description MIC5338-MGYMT EV Dual 300mA LDO Regulator Evaluation Board VOUT1 = 2.8V, VOUT2 = 1.8V MIC5339-MGYMT EV Dual 300mA LDO Regulator with Auto Discharge Evaluation Board VOUT1 = 2.8V, VOUT2 = 1.8V 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 • http://www.micrel.com September 2010 M9999-092410-A Micrel, Inc. MIC5338/9 Evaluation Board MIC5338/9 Evaluation Board Schematic Bill of Materials Item Part Number Manufacturer Description Qty. C1 C1608X5R0J106K 10µF Ceramic, 6.3V, X5R, Size 0603 Capacitor 1 C2, C3 GRM188R60J225KE19D Murata(1) 1µF Ceramic, 10V, X5R, Size 0402 Capacitor 2 R1, R2 CRCW04021003KFKEA Vishay(3) 100KΩ,1/16W, Size 0402 Resistor MIC5338-XXYMT U1 MIC5339-XXYMT TDK (2) Micrel Micrel (4) (4) Dual, 300mA LDO, 1.6mm x 1.6mm Thin MLF 2 ® Dual, 300mA LDO with Auto Discharge, 1.6mm x 1.6mm Thin MLF® 1 Notes: 1. Murata: www.murata.com. 2. TDK: www.tdk.com. 3. Vishay: www.vishay.com. 4. Micrel, Inc.: www.micrel.com. September 2010 2 M9999-092410-A Micrel, Inc. MIC5338/9 Evaluation Board PCB Layout Recommendations Top Layer Bottom Layer September 2010 3 M9999-092410-A Micrel, Inc. MIC5338/9 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 Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right 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. © 2010 Micrel, Incorporated. September 2010 4 M9999-092410-A