MIC5295 Evaluation Board Low Quiescent Current, 150mA LDO Regulator General Description The MIC5295 is a highly accurate 150mA low dropout regulator with wide input voltage range of 2.3V to 24V and ultra-low ground current of 18μA. This combination of high voltage and low ground current makes the MIC5295 ideal for portable electronic applications using 1-cell, 2-cell or 3cell Li-Ion battery supplies. Available in fixed and adjustable output voltage versions, the MIC5295 is offered in the TO-252-5 (D-Pak) package. Requirements The MIC5295 evaluation board requires an input power supply that is able to deliver at least 350mA at a voltage within the range of 2.3V to 24V. The output load can be either active or passive. MIC5295 is stable with either a ceramic or tantalum output capacitor of only 2.2µF for stability. The evaluation board includes an input capacitor of 10μF to compensate for long inductive test leads. Precautions The evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN terminal may damage the device. high as Vin (J1). Forcing the enable pin high enables the output voltage. Do not leave this pin floating as the output will be in indeterminate state. 3. Connect the loads to the VOUT terminal (J4) 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) terminal. 4. Adjust Pin. The MIC5295YD can be adjusted from 1.24V to 20V by using two external resistors. R1 is connected between ADJ (J6) and VOUT (J4). R1 should not exceed 300kΩ. Also R2 is connected from ADJ (J6) to GND (J5) with value of 100kΩ. The resistors set the output voltage based on the following equation: ⎛V ⎞ R1 = R2 × ⎜ OUT − 1⎟ 1 . 24 V ⎝ ⎠ The reference voltage is set to 1.24V as shown in the equation. In this configuration VOUT is set to approximately 5V. 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 ≤ 24V). 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. Ordering Information Part Number Description MIC5295-3.0YD EV 150mA LDO Evaluation Board MIC5295-3.3YD EV 150mA LDO Evaluation Board MIC5295-5.0YD EV 150mA LDO Evaluation Board MIC5295YD EV 150mA Adjustable LDO Evaluation Board 2. Enable/Disable the MIC5295. The MIC5295 comes with an active-high enable pin that allows the regulator to be disabled. To disable an output, simply jumper the EN terminal (J3) to the GND terminal (J2). The enable pin (J3) can be pulled as Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com July 2010 M9999-071410-B (408) 944-0800 Micrel, Inc. MIC5295 Evaluation Board Evaluation Board Schematic (Fixed Output) Bill of Materials Item Part Number C1 UMK325BJ106KM-T C2 TMK212BJ225KG-T U1 MIC5295-XXYD Manufacturer Taiyo Yuden (1) Taiyo Yuden (2) Micrel, Inc. Description Qty. Capacitor, 10µF, 50V, X5R, Size 1210 1 Capacitor, 2.2µF, 25V, X5R, Size 0805 1 Low Quiescent Current, 150mA LDO Regulator 1 Notes: 1. Tiao Yuden: www.t-yuden.com 2. Micrel, Inc.: www.micrel.com. July 2010 2 M9999-071410-B Micrel, Inc. MIC5295 Evaluation Board Evaluation Board Schematic (Adjustable Output) Bill of Materials Item C1 Part Number UMK325BJ106KM-T Manufacturer Taiyo Yuden (1) C2 TMK212BJ225KG-T Taiyo Yuden R1 CRCW06033003FKEYE3 Vishay Dale R2 CRCW06031003FKEYE2 U1 MIC5295YD (2) Vishay Dale (3) Micrel, Inc. Description Qty. Capacitor, 10µF, 50V, X5R, Size 1210 1 Capacitor, 2.2µF, 25V, X5R, Size 0805 1 Resistor, 300k, 1%. 1/16W, Size 0603 1 Resistor, 100k, 1%. 1/16W, Size 0603 1 Low Quiescent Current,150mA Adjustable LDO Regulator 1 Notes: 1. Murata: www.t-yuden.com 2. Vishay: www.vishay.com. 3. Micrel, Inc.: www.micrel.com. July 2010 3 M9999-071410-B Micrel, Inc. MIC5295 Evaluation Board Evaluation Board Layout Top Layer Bottom Layer July 2010 4 M9999-071410-B Micrel, Inc. MIC5295 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. © 2010 Micrel, Incorporated. July 2010 5 M9999-071410-B