MIC5331 Evaluation Board Micro-Power High Performance Dual 300mA ULDO™ (2.3V ≤ VIN ≤ 5.5V). An ammeter may be placed between the input supply and the VIN terminal to the evaluation board to accurately monitor the input current. The ammeter and/or power lead resistance can reduce the voltage supplied to the input so monitor the supply voltage at the VIN terminal.. General Description The MIC5331 is a tiny dual output, low quiescent current LDO. The MIC5331 provides two high performance 300mA LDOs in a tiny 8 pin 2mm x 2mm Thin MLF® package. The MIC5331 dual Ultra Low Dropout (ULDO™) linear regulator is easy to use. A small output capacitance of only 1µF for each of the outputs is required. An input capacitor may be required when the power supply is more than 4-inches away from the device. The evaluation board includes an input capacitor of 1µF to compensate for long inductive test leads. 2. Enable/Disable the MIC5331. The evaluation board is set up for “Default Enable” on both outputs with a 10k pull up resistor on each of the enable pins (EN1 and EN2) to VIN. To disable an output, simply jumper the EN terminal (J5 for LDO1, J4 for LDO2) to the GND terminal (J2). The enable pins must be either pulled high or low for proper operation. Removing the pull up resistors and leaving the pins floating will cause the regulators to operate in an indeterminate state. Requirements The MIC5331 evaluation board requires an input power source that is able to deliver at least 600mA at a voltage within the range of 2.3V 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. The MIC5331 evaluation board is tailored for a Li-Ion range input supply voltage. It should not exceed 5.5V on the input. 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 3. Connect the loads to the VOUT terminals (J6 for LDO1, J8 for LDO2) and ground terminal (J7). The load can be either a passive (resistor) or active (electronic load). Be sure to monitor the output voltage at the VOUT (J6 and J8) terminals. Ordering Information Part Number Description MIC5331-XXYMT EV Evaluation board with the 300mA Dual ULDO™ device ULDO 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 • http://www.micrel.com March 2008 M9999-030408-A Micrel, Inc. MIC5331 Evaluation Board Evaluation Board Schematic U1 MIC5331-xxYMT VIN J1 VIN 1 R3 10k VIN VOUT1 NC VOUT2 8 J6 VOUT1 7 J8 VOUT2 R2 10k 3 J4 EN2 J5 EN1 4 5 EN2 EN1 NC GND C1 1µF 6 C2 1µF 2 C3 1µF J2 GND J7 GND Bill of Materials Item Part Number Manufacturer (1) TDK Description Qty C1, C2, C3 C1608X5R0J105K Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 3 R2, R3 CRCW06031002FKEYE3 Vishay(2) Resistor, 10kΩ, 1%, 1/16W, Size 0603 2 U1 MIC5331-XXYMT Micrel(3) UCAP LDO, Dual 300mA, Size 2mm x 2mm Thin MLF® 1 Notes: 1. TDK: www.tdk.com 2. Vishay: www.vishay.com 3. Micrel, Inc.: www.micrel.com March 2008 2 M9999-030408-A Micrel, Inc. MIC5331 Evaluation Board PCB Layout Recommendations 1350 (mil) 1400 (mil) Top Layer 1350 (mil) 1400 (mil) Bottom Layer March 2008 3 M9999-030408-A Micrel, Inc. MIC5331 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. March 2008 4 M9999-030408-A