MIC5322 Evaluation Board High Performance Dual 150mA µCap ULDO™ General Description The MIC5322 is a tiny dual output, ultra low dropout linear regulator. The MIC5322 regulator provides a single active low enable pin for both outputs as well as a bypass pin to reduce the output voltage noise. The MIC5322 provides two high performance 150mA LDOs in a tiny 6 pin 1.6mm x 1.6mm Thin MLF® package. The MIC5322 dual Ultra Low Dropout (ULDO™) linear regulator is easy to use. A small capacitance of only 1µF is required for the input voltage and each of the outputs to maintain stability. A bypass capacitor of 0.01µF is included on the evaluation board to reduce the output voltage noise and improve the Power Supply Rejection Ratio (PSRR). The evaluation board includes an input capacitor of 10µF to compensate for long inductive test leads. 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. The ammeter and/or power lead resistance can reduce the voltage supplied to the input so monitor the supply voltage at the VIN terminal. 2. Enable/Disable the MIC5322. The evaluation board is set up for “Default Disable” on both outputs with a 10k pull up resistor on the enable pin (/EN) to VIN. To enable both outputs, simply jumper the /EN terminal (J7) to the GND terminal (J2 or J5). The enable pin must be either pulled high or low for proper operation. Removing the pull up resistors and leaving the pin floating will cause the regulators to operate in an indeterminate state. Requirements The MIC5322 evaluation board requires an input power source that is able to deliver at least 300mA at a voltage within the range of 2.3V to 5.5V. The output load can be either active or passive. 3. Connect the loads to the VOUT terminals (J4 for LDO1, J6 for LDO2) 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 and J6) terminals. Precautions The evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN terminal may damage the device. The evaluation board is tailored for a Li-Ion range input supply voltage. It should not exceed 5.5V on the input. Ordering Information Part Number MIC5322-XXYMT EV Description Evaluation board with the 150mA Dual ULDO™ device with bypass and active low enable 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 M9999-032708-A Micrel, Inc. MIC5322 Evaluation Board Evaluation Board Schematic U1 MIC5322-xxYMT VIN J1 VIN 1 VIN VOUT1 6 J4 VOUT1 5 J6 VOUT2 R2 10k VOUT2 J3 BYP 3 J7 /EN1 4 C1 10µF BYP EN GND C2 0.01µF C3 1µF 2 C4 1µF J2 GND J5 GND Bill of Materials Item C1 Part Number C1608X5R0J106M Manufacturer TDK (1) C2 VJ0603Y103KXQ Vishay C3, C4 C1608X5R0J105M TDK R1 OPEN (2) (1) Description Qty Capacitor, 10µF Ceramic, 6.3V, X5R, Size 0603 1 Capacitor, 0.01µF Ceramic, 10V, X7R, Size 0603 1 Capacitor, 1µF Ceramic, 6.3V, X5R, Size 0603 2 Do not populate (2) R2 CRCW06031002FKEYE3 Vishay U1 MIC5322-XXYMT Micrel (3) Resistor, 10kΩ, 1%, 1/16W, Size 0603 1 ® UCAP LDO, Dual 150mA, Size 1.6mm x 1.6mm Thin MLF 1 Notes: 1. TDK: www.tdk.com 2. Vishay: www.vishay.com 3. Micrel, Inc.: www.micrel.com March 2008 2 M9999-032708-A Micrel, Inc. MIC5322 Evaluation Board PCB Layout Recommendations Top Layer Bottom Layer March 2008 3 M9999-032708-A Micrel, Inc. MIC5322 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. March 2008 4 M9999-032708-A