MIC5375/6 Evaluation Board High Performance Low Dropout 150mA LDO General Description The MIC5375/6 is a low quiescent current, low dropout regulator designed for optimal performance in a small space. When the MIC5376 is disabled an internal resistive load is automatically applied to the output to discharge the output capacitor. The MIC5375/6 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 MIC5375/6 offers low dropout voltage 120mV typically @ 150mA. The MIC5375/6 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 MIC5375/6 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 MIC5375/6. The YMT (1x1 TMLF) evaluation board is provided with a 100kΩ pull up resistor on enable pin (EN) to VIN, where as the YC5 (SC-70) evaluation board is provided with a 100kΩ pull down resistor from the enable pin (EN) to GND. Simply jumper the enable pin (EN) to VIN to enable the regulator output, or to GND to disable the output. The enable pin must be either pulled high or low. Removing the pull up resistor and leaving the EN pin floating will cause the regulator 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 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 10uF capacitor connected from VIN (J1) to GND (J2). Part Number Description MIC5375-2.8YMT High Performance Low Dropout 150mA LDO, 1x1 TMLF,VOUT = 2.8V Evaluation Board MIC5375-2.8YC5 High Performance Low Dropout 150mA LDO, SC-70, VOUT = 2.8V Evaluation Board MIC5376-2.8YMT High Performance Low Dropout 150mA LDO, 1x1 TMLF, VOUT = 2.8V Evaluation Board MIC5376-2.8YC5 High Performance Low Dropout 150mA LDO, SC-70,VOUT = 2.8V 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 January 2009 M9999-012109-A Micrel, Inc. MIC5375/6 Evaluation Board Evaluation Board Schematic U1 MIC5375/6-xxYMT 4 VIN VOUT 1 J1 VIN C1 10µF 6.3V 2 GND EN J2 GND J3 VOUT 3 R1 100k C2 1µF 10V J5 EN J4 GND Bill of Materials Item C2 Part Number Manufacturer GRM155R61A105KE15D Murata C1005X5R1A105KT TDK (2) CV05X5R105K10AH AVX/Kyocera C1 C1608X5R0J106Z TDK R1 CRCW0603100KFKEA Vishay U1 MIC5375/6-xxYMT Description Qty. Capacitor, 1µF Ceramic, 10V, X5R, Size 0402 2 (1) (3) (2) Capacitor, 10µF Ceramic, 6.3V, X5R, Size 0603 (4) (5) Micrel, Inc. Resistor, 100kΩ, 1%, 1/16W, Size 0603 1 High Performance 150mA LDO, 4-Pin 1mm x 1mm Thin MLF® 1 Notes: 1. Murata: www.murata.com 2. TDK: www.tdk.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. MIC5375/6 Evaluation Board J1 VIN J5 EN R3 100k C1* 2.2µF 6.3V U1 MIC5375/6YC5 1 VIN VOUT 5 3 EN GND NC 4 C2* 2.2µF 6.3V 2 J2 GND J3 VOUT J4 GND Bill of Materials Item C1, C2 C1, C2 Part Number Manufacturer Description Qty. Capacitor, 2.2µF, 6.3V, X5R, Size 0402 2 Capacitor, 1µF Ceramic, 10V, 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 GRM155R61A105KE15D Murata C1005X5R1A105KT TDK (1) (2) CV05X5R105K10AH AVX/Kyocera R1 CRCW0402619KFKEA Vishay R2 CRCW04022673KFKEA Vishay R3 U1 CRCW04021003KFKEA MIC5375/6YC5 (3) (3) (4) Vishay (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 * CIN = COUT = 1µF for Vout ≥ 2.5V, CIN = COUT = 2.2µF for VOUT < 2.5V January 2009 3 M9999-012109-A Micrel, Inc. MIC5375/6 Evaluation Board PCB Layout Recommendations (1mm x 1mm 4-Pin Thin MLF®) Fixed Top Layer Bottom Layer January 2009 4 M9999-012109-A Micrel, Inc. MIC5375/6 Evaluation Board PCB Layout Recommendations (SC-70-5) Top Layer Bottom Layer January 2009 5 M9999-012109-A Micrel, Inc. MIC5375/6 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