MIC5377/8 Evaluation Board High Performance Low Dropout 150mA LDO General Description The MIC5377/8 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. When the MIC5378 is disabled an internal resistive load is automatically applied to the output to discharge the output capacitor. The MIC5377/8 is capable of sourcing 150mA of output current while only consuming 29µA of operating current. This high performance LDO offers fast transient response and good PSRR while consuming a minimum of current. Ideal for battery operated applications; the MIC5377/8 offers low dropout voltage 120mV typically @ 150mA. The MIC5377/8 can also be put into a zero-off-mode current state, drawing virtually no current when disabled. An input capacitor may be required when the power supply is more than 4-inches from the device. The evaluation board includes an input capacitor of 10μF to compensate for long inductive test leads. Requirements The MIC5377/8 evaluation board requires an input power supply of 400mA with a voltage range of 2.3V to 5.5V to the VIN. 2. Enable/Disable the MIC5377/8. The evaluation board is provided with 10k pull up resistors on enable pin (EN) to VIN. To disable an output, simply jumper the EN terminal (J5) to the GND terminal (J2).The enable pin must be either pulled high or low. Removing the pull up resistors and leaving the pins floating will cause the regulators to operate in an indeterminate state. 3. Connect the loads to the VOUT terminal (J3) and ground terminal (J2). The load can be either a passive (resistor) or active (electronic load). Be sure to monitor the output voltage at the VOUT (J3) terminals. The evaluation board has a 1uF capacitor connected from VOUT (J3) to GND (J2). Ordering Information Precautions The evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN terminal may damage the device. Getting Started Part Number Description MIC5377YMT High Performance Low Dropout 150mA LDO, VOUT = ADJ Evaluation Board MIC5377YC5 High Performance Low Dropout 150mA LDO, VOUT = ADJ Evaluation Board MIC5378YMT High Performance Low Dropout 150mA LDO, VOUT = ADJ Evaluation Board MIC5378YC5 High Performance Low Dropout 150mA LDO, VOUT = ADJ Evaluation Board 1. Connect an external supply to VIN. Apply desired input voltage to the VIN (J1) and ground terminal (J2) of the evaluation board, paying careful attention to polarity and supply voltage. An ammeter may be placed between the input supply and the VIN terminal to the evaluation board. Ammeter and/or power lead resistance can reduce the voltage supplied to the input. Ensure that the supply voltage is monitored at VIN terminal. There is 1uF capacitor connected from VIN (J1) to GND (J2). 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 January 2009 M9999-012109-A Micrel, Inc. MIC5377/8 Evaluation Board Evaluation Board Schematic J1 VIN J5 EN R3 100k C1 10µF 6.3V U1 MIC5377/8-xxYMT 2 VIN VOUT 3 1 EN GND ADJ J3 VOUT R1 619k R2 267k 4,5,6,8 J2 GND 7 C2 2.2µF 6.3V J4 GND Bill of Materials Item C2 Part Number Manufacturer JMK105BJ225MV-F Taiyo Yuden GRM155R60G225ME15D Murata C1 R1 Capacitor, 2.2µF, 6.3V, X5R,Size 0402 AVX/Kyocera C1608Y5V0J106Z TDK 2 Capacitor, 10µF, 6.3V, X5R, Size 0603 (4) Resistor, 619kΩ, 1%, 1/16W, Size 0402 1 (4) Resistor, 267kΩ, 1%, 1/16W, Size 0402 1 (4) Resistor, 100kΩ, 1%, 1/16W, Size 0402 1 High Performance 150mA LDO, 8-Pin 1.2mm x 1.2mm Thin MLF® 1 Vishay CRCW04022673KFKEA Vishay R3 CRCW04021003KFKEA Vishay MIC5377/8-xxYMT Qty. (3) (1) R2 U1 (2) CV05X5R225K10AB CRCW0402619KFKEA Description (1) (5) Micrel, Inc. Notes: 1. Taiyo Yuden: 2. Murata: www.murata.com 3. AVX/Kyocera: www.avx.com 4. Vishay: www.vishay.com 5. Micrel, Inc.: www.micrel.com January 2009 2 M9999-012109-A Micrel, Inc. MIC5377/8 Evaluation Board PCB Layout Recommendations (1.2mm x 1.2mm 8-Pin Thin MLF®) Adjustable Top Layer Bottom Layer January 2009 3 M9999-012109-A Micrel, Inc. MIC5377/8 Evaluation Board Evaluation Board Schematic J1 VIN J5 EN R3 100k C1 2.2µF 6.3V U1 MIC5377/8YC5 1 VIN VOUT 5 3 EN GND ADJ J3 VOUT R1 619k R2 267k 2 J2 GND 4 C2 2.2µF 6.3V J4 GND Bill of Materials Item C1, C2 R1 R2 Part Number Manufacturer Description Qty. Capacitor, 2.2µF, 6.3V, X5R, Size 0402 2 (4) Resistor, 619kΩ, 1%, 1/16W, Size 0402 1 (4) Resistor, 267kΩ, 1%, 1/16W, Size 0402 1 Resistor, 100kΩ, 1%, 1/16W, Size 0402 1 High Performance 150mA LDO, 5-Pin SC-70 1 JMK105BJ225MV-F Taiyo Yuden GRM155R60G225ME15D Murata (1) (2) CV05X5R225K10AB AVX/Kyocera CRCW0402619KFKEA Vishay CRCW04022673KFKEA (3) Vishay (4) R3 CRCW04021003KFKEA Vishay U1 MIC5377/8YC5 Micrel, Inc. (5) Notes: 1. Taiyo Yuden: 2. Murata: www.murata.com 3. AVX/Kyocera: www.avx.com 4. Vishay: www.vishay.com 5. Micrel, Inc.: www.micrel.com January 2009 4 M9999-012109-A Micrel, Inc. MIC5377/8 Evaluation Board PCB Layout Recommendations (SC-70-5) Top Layer Bottom Layer January 2009 5 M9999-012109-A Micrel, Inc. MIC5377/8 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. January 2009 6 M9999-012109-A