MIC5304 Evaluation Board Single 150mA Low Operating Current LDO with Voltage Select General Description The MIC5304 is a 150mA output, low quiescent current voltage selectable LDO. This regulator is capable of sourcing 150mA of output current with a low quiescent current of 24µA. The voltage select pin allows the output to be selected between two preset voltages. The MIC5304 is available in a tiny 6 pin 1.6mm x 1.6mm Thin MLF® package. The MIC5304 150mA linear regulator is simple to use. A small output capacitance of only 1µF for the output 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 10µF to compensate for long inductive test leads. 2. Enable/Disable the MIC5304. To enable the MIC5304, jumper the enable terminal (J6) to VIN. To disable the output, simply jumper the EN terminal (J6) to the GND terminal (J2 or J5). The enable pin must be either pulled high or low for proper operation. Leaving the enable pin floating will cause the regulator to operate in an indeterminate state. 3. Connect the loads to the VOUT terminal (J4) and ground terminal (J5). The load can be either a passive (resistor) or active (electronic load). Be sure to monitor the output voltage at the VOUT (J4) terminal. 4. Voltage Select. The voltage select terminal is used to select the output voltage between two fixed voltages. The VSEL terminal must be connected to either a high or low signal, leaving the VSEL pin floating will cause the output voltage to operate in an indeterminate state. To set VSEL high simply jumper the VSEL terminal (J3) to VIN. To set VSEL low jumper the VSEL terminal (J3) to GND. Requirements The MIC5304 evaluation board requires an input power source that is able to deliver at least 200mA 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. 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 (2.3V ≤ 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. Ensure that the supply voltage is monitored at the VIN terminal. Ammeter and/or power lead resistance can reduce the voltage supplied to the input. Ordering Information Part Number Description MIC5304-RGYMT EV 150mA selectable 3.2V/1.8V output voltage LDO Evaluation board MIC5304-XGHYMT EV 150mA selectable 3.15V/1.875V output voltage LDO Evaluation board MIC5304-XDYMT EV 150mA selectable 3.15V/1.85V output voltage LDO Evaluation board 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 December 2008 M9999-120508-A Micrel, Inc. MIC5304 Evaluation Board Evaluation Board Schematic J1 VIN U1 MIC5304-xxYMT VIN 1 J3 VSEL 3 VIN VSEL VOUT 6 NC 5 EN 4 GND C2 10µF J4 VOUT J6 EN C1 1µF 2 J5 GND J2 GND Bill of Materials Item C1 Part Number C1608X5R0J105K C2 C1608X5RV0J106Z U1 MIC5304-xxYMT Manufacturer Description Qty TDK (1) Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 TDK (1) Capacitor, 10µF Ceramic, 6.3V, X5R, Size 0603 1 150mA LDO with Voltage Select, Size 1.6mm x 1.6mm Thin MLF® 1 Micrel(2) 1 Notes: 1. TDK: www.tdk.com 2. Micrel, Inc.: www.micrel.com December 2008 2 M9999-120508-A Micrel, Inc. MIC5304 Evaluation Board PCB Layout Recommendations Top Layer Bottom Layer December 2008 3 M9999-120508-A Micrel, Inc. MIC5304 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. © 2008 Micrel, Incorporated. December 2008 4 M9999-120508-A