MIC5370/1 Evaluation Board High Performance Dual 150mA LDO 1.6mm x1.6mm Thin MLF® General Description The MIC5370/1 is an advanced dual LDO ideal for powering general purpose portable devices. The MIC5370/1 provides two independently controlled, high performance 150mA LDOs in a tiny 1.6mm x 1.6mm Thin MLF® package. When the MIC5371 is disabled an internal resistive load is automatically applied to the output to discharge the output capacitor. Ideal for battery powered applications, the MIC5370/1 offers low dropout voltage 155mV@150mA and low ground current typically 32μA per LDO. 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. Getting Started Requirements The MIC5370/1 evaluation board requires an input power supply that is able to deliver at least 350mA at a voltage within the range of 2.5V to 5.5V. The output load can be either active or passive. Precautions The evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN terminal may damage the device. 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 (2.5V ≤ VIN ≤ 5.5V). 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 MIC5370/1. The evaluation board is configured for “Default Disable” with 100KΩ pull down resistors on the enable pins to GND. To enable the MIC5370/1 jumper the enable terminal (J7 for LDO1 and J8 for LDO2) to VIN. To disable the output, simply remove the jumper from the EN terminal. The enable pin must be either pulled high or low for proper operation. Removing the pull down resistors and leaving the pins floating will cause the regulators to operate in an indeterminate state. 3. Connect the load to the VOUT terminals (J3 for LDO1 and J5 for LDO2) and ground terminal (J4). The load can be either a passive (resistor) or active (electronic load). Be sure to monitor the output voltage at the VOUT (J3, J5) terminals. 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 June 2009 M9999-061709-A Micrel, Inc. MIC5370/1 Evaluation Board Ordering Information Part Number Description MIC5370-SSYMT EV High Performance Dual 150mA LDO VOUT1 =3.3V, VOUT2 = 3.3V Evaluation Board MIC5370-PPYMT EV High Performance Dual 150mA LDO VOUT1 =3.0V, VOUT2 = 3.0V Evaluation Board MIC5370-MGYMT EV High Performance Dual 150mA LDO VOUT1 =2.8V, VOUT2 = 1.8V Evaluation Board MIC5370-M4YMT EV High Performance Dual 150mA LDO VOUT1 =2.8V, VOUT2 = 1.2V Evaluation Board MIC5370-G4YMT EV High Performance Dual 150mA LDO VOUT1 =1.8V, VOUT2 = 1.2V Evaluation Board MIC5370-4CYMT EV High Performance Dual 150mA LDO VOUT1 =1.2V, VOUT2 = 1.0V Evaluation Board MIC5371-SSYMT EV High Performance Dual 150mA LDO with auto discharge VOUT1 =3.3V, VOUT2 = 3.3V Evaluation Board MIC5371-PPYMT EV High Performance Dual 150mA LDO with auto discharge VOUT1 =3.0V, VOUT2 = 3.0V Evaluation Board MIC5371-MGYMT EV High Performance Dual 150mA LDO with auto discharge VOUT1 =2.8V, VOUT2 = 1.8V Evaluation Board MIC5371-M4YMT EV High Performance Dual 150mA LDO with auto discharge VOUT1 =2.8V, VOUT2 = 1.2V Evaluation Board MIC5371-G4YMT EV High Performance Dual 150mA LDO with auto discharge VOUT1 =1.8V, VOUT2 = 1.2V Evaluation Board MIC5371-4CYMT EV High Performance Dual 150mA LDO with auto discharge VOUT1 =1.2V, VOUT2 = 1.0V Evaluation Board June 2009 2 M9999-061709-A Micrel, Inc. MIC5370/1 Evaluation Board Evaluation Board Schematic U1 MIC5370/1-xxYMT J1 VIN 1 VIN VOUT1 VOUT2 J7 EN1 4 EN1 GND C3 1µF/10V R1 100k 2 EN2 J3 VOUT1 J5 VOUT2 J8 EN2 6 5 3 C1 1µF/10V R1 100k C2 1µF/10V J2 GND J4 GND J6 GND Bill of Materials Item Part Number Manufacturer Description Qty. C1 C1608X5R0J106K TDK(2) Capacitor, 10µF Ceramic, 6.3V, X5R, Size 0603 1 (1) Capacitor, 1µF Ceramic, 10V, X5R, Size 0402 2 (3) Resistor, 100KΩ,1/16W, Size 0402 C2, C3 R1, R2 GRM188R60J225KE19D CRCW04021003KFKEA MIC5370-XXYMT Murata Vishay Micrel (4) U1 MIC5371-XXYMT Micrel (4) Dual, 150mA LDO, 1.6mm x 1.6mm Thin MLF 2 ® Dual, 150mA LDO with auto discharge, 1.6mm x 1.6mm Thin MLF® 1 Notes: 1. Murata: www.murata.com 2. TDK: www.tdk.com 3. Vishay: www.vishay.com 4. Micrel, Inc.: www.micrel.com June 2009 3 M9999-061709-A Micrel, Inc. MIC5370/1 Evaluation Board PCB Layout Recommendations Top Layer Bottom Layer June 2009 4 M9999-061709-A Micrel, Inc. MIC5370/1 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. June 2009 5 M9999-061709-A