MIC5353 Evaluation Board 500mA LDO in 1.6mm × 1.6mm Package General Description Forcing the enable pin high enables the output voltage. Do not leave this pin floating as the output will be in indeterminate state. The MIC5353 is a high-performance, Ultra Low Dropout (ULDO™) linear regulator which provides low output noise of 30μVRMS. The MIC5353 is capable of sourcing 500mA output current with extremely low dropout voltage of 160mV and low ground current (typically 90µA) making it ideal for battery operated applications. The MIC5353 is available in the 1.6mm x 1.6mm Thin MLF® package occupying only 2.56mm2 of PCB area which is a significant reduction compared to SC-70 and 2mm x 2mm MLF® packages. 3. Connect the loads to the VOUT terminal (J5) and ground terminal (J6). The load can be either a passive (resistor) or active (electronic load). Be sure to monitor the output voltage at the VOUT (J5) terminal. The design requires 1µF or greater on the output to maintain stability from VOUT to GND. 4. Adjust Pin. The MIC5353YMT can be adjusted from 1.25V to 5.5V by using two external resistors. R1 of 20KΩ is connected between ADJ and VOUT. also R2 is connected from ADJ to GND with a value of 10KΩ. The resistors set the output voltage based on the following equation: Requirements The MIC5353 evaluation board requires an input power supply that is able to deliver at least 1A within the voltage range of 2.6V to 6V. The output load can be either active or passive. The evaluation board includes an input capacitor of 10μF to compensate for long inductive test leads. ⎛ VOUT ⎞ − 1⎟ R1 = R2 × ⎜ ⎝ 1.25 ⎠ Precautions The MIC5353 evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN terminal may damage the device. The reference voltage is 1.25V (as shown in the above equation). In this configuration VOUT is set to approximately 3.75V. Getting Started 1. Connect an external supply to VIN. Apply the desired input voltage to the VIN (J2) and ground terminal (J3) of the evaluation board, paying careful attention to polarity and supply voltage (2.6V ≤ VIN ≤ 6V). 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 MIC5353. The MIC5353 comes with an active high enable pin that allows the regulator to be disabled. To disable an output, simply jumper the EN terminal (J1) to the GND terminal (J3). The enable pin (J1) can be pulled as high as VIN (J2). 5. Bypass Pin. A 0.1µF capacitor (C2) is provided from the noise bypass pin to ground to reduce output voltage noise. The bypass capacitor can be increased further reducing noise and improving PSRR. Turn-on time increases slightly with respect an increase in bypass capacitance. Ordering Information Part Number Description MIC5353-1.8YMT EV 500mA LDO Evaluation Board MIC5353-2.8YMT EV 500mA LDO Evaluation Board MIC5353-3.3YMT EV 500mA LDO Evaluation Board MIC5353YMT EV 500mA Adjustable LDO Evaluation Board 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 May 2010 M9999-052810-A Micrel, Inc. MIC5353 Evaluation Board Typical Application Schematic (Fixed Output) Bill of Materials Item C1 Part Number 0603D106KAT2A 06035C104KAT2A GRM188R71H104KA93D 06036D105KAT2A GRM188R60J105KE19D C2 C3 U1 MIC5353-xxYMT Manufacturer (1) AVX AVX(1) muRata(2) AVX(1) muRata(2) Micrel, Inc.(3) Description Qty. Capacitor, 10µF Ceramic, 6.3V, X5R, Size 0603 1 Capacitor, 0.1µF Ceramic, 50V, X5R, Size 0603 1 Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 1 500mA ULDO™, 1.6mm × 1.6mm Thin MLF® 1 Notes: 1. AVX: www.avx.com. 2. Murata Tel: www.murata.com. 3. Micrel, Inc.: www.micrel.com. May 2010 2 M9999-052810-A Micrel, Inc. MIC5353 Evaluation Board Typical Application Schematic (Adjustable Output) Bill of Materials Item C1 Part Number R1 R2 0603D106KAT2A 06035C104KAT2A GRM188R71H104KA93D 06036D105KAT2A GRM188R60J105KE19D CRCW060320K0FKEA CRCW060310K0FKEA U1 MIC5353YMT C2 C3 Manufacturer (1) AVX AVX(1) muRata(2) AVX(1) muRata(2) Vishay(3) Vishay(3 Micrel, Inc.(4) Description Qty. Capacitor, 10µF Ceramic, 6.3V, X5R, Size 0603 1 Capacitor, 0.1µF Ceramic, 50V, X5R, Size 0603 1 Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 1 Resistor, 20kΩ, 1%, 1/16W, Size 0603 Resistor, 10kΩ, 1%, 1/16W, Size 0603 1 1 500mA Adjustable ULDO™, 1.6mm × 1.6mm Thin MLF® 1 Notes: 1. AVX: www.avx.com. 2. Murata Tel: www.murata.com. 3. Vishay: www.vishay.com. 4. Micrel, Inc.: www.micrel.com. May 2010 3 M9999-052810-A Micrel, Inc. MIC5353 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. May 2010 4 M9999-052810-A