MIC5385 Evaluation Board Ultra-Small Triple 150mA Output LDO General Description Getting Started The MIC5385 is an advanced, triple-output, low-noise LDO for powering general purpose portable devices. The MIC5385 provides three independently-enabled, highperformance, 150mA LDOs in an ultra-small 2mm x 2mm • Connect an External Supply to VIN. Apply the desired input voltage to the VIN (J1) and ground (J2) terminal of the evaluation board, paying careful attention to polarity and supply voltage (2.5V ≤ VIN ≤ 5.5V). An ammeter can 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/or power-lead resistance can reduce the voltage supplied to the input. • Enable/Disable the MIC5385. To enable the MIC5385 jumper, the enable terminal (J5 for LDO1, J4 for LDO2, and J3 for LDO3) to VIN. To disable the output, simply remove the jumper from the EN terminal. The enable pin must be either pulled high or low. Leaving the pin floating will cause the regulator to operate in an indeterminate state. The evaluation board is supplied with 100KΩ pull-down resistors for default off state. • Connect the Load. Connect the load to the VOUT Terminals (J7 for LDO1, J8 for LDO2 and J6 for LDO3) and Ground Terminal (J9, J10). The load can be either a passive (resistor) or active (electronic load). Be sure to monitor the output voltage at the VOUT (J6, J7 and J8) terminals. ® Thin MLF package while using only four external components. Ideal for battery-powered applications, the MIC5385 offers low dropout voltage of 180mV at 150mA and low ground current (typically 32µA per LDO). It can also be put into a zero-off-mode current state, drawing virtually no current when disabled. An input capacitor is 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. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Requirements The MIC5385 evaluation board requires an input power supply that is capable of delivering a minimum 600mA at a voltage range of 2.5V to 5.5V. The output load can be either active or passive. Precautions The MIC5385 evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN terminal may damage the device. Ordering Information Part Number MIC5385-SGFYMT EV Description Triple-Output LDO Evaluation Board. VOUT1 =3.3V, VOUT2 =1.8V, VOUT3 =1.5V _________________________________________________________________________________________________________________________ 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 April 2010 M9999-041610-A Micrel, Inc. MIC5385 Evaluation Board Evaluation Board Schematic Bill of Materials Item C1 Part Number C1608X5R0J106K GRM155R1A1055KE19D C2, C3, C4 0402ZD105KAT2A LMK105BJ105KV-F R1, R2, R3 CRCW0402100KFKEA U1 MIC5385-SGFYMT Manufacturer TDK (1) Qty. 10μF, Ceramic, 6.3V, X5R, Size 0603 Capacitor Murata(2) 1 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor AVX(3) Taiyo Yuden Description 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor (4) (5) Vishay Micrel, Inc.(6) 3 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor 100KΩ, 1%, 1/16W, Size 0402 Resistor 3 High-Performance, Triple-Output, 150mA LDO 1 Notes: 1. TDK: www.tdk.com. 2. Murata: www.murata.com. 3. AVX: www.avx.com. 4. Taiyo Yuden: www.t-Yuden.com. 5. Vishay: www.vishay.com. 6. Micrel, Inc.: www.micrel.com. April 2010 2 M9999-041610-A Micrel, Inc. MIC5385 Evaluation Board PCB Layout Recommendations Top Layer Bottom Layer 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. © 2010 Micrel, Incorporated. April 2010 3 M9999-041610-A