MIC5301/18 Evaluation Board Single Cap ULDO The evaluation board has a 10F ceramic on the V pin. IN General Description Although this is much larger than required for the device, The demonstration board can be used to evaluate both the this was designed to allow for the long inductive test leads MIC5301 and MIC5318 low dropout linear regulators. The that will be attached to the evaluation board MIC5301 and MIC5318 are offered in fixed and adjustable Data sheets and support documentation can be found on outputs. Fixed output versions add bypass pin function- Micrels web site at: www.micrel.com. ality, allowing reduced output noise. The adjustable version allows for the use of a resistor divider network to Getting Started adjust for the desired output voltage. The evaluation board 1. Connect an external supply to V terminal. Apply V IN IN accommodates the fixed version. (J3) and ground (J2 and J4) terminals of the evaluation board, paying careful attention to polarity and supply Requirements voltage (2.3V to 6V). Be sure to monitor the supply voltage The MIC5301/18 requires a power supply that is able to at the V terminal. IN deliver 300mA with an input voltage range of 2.3V to 6V. 2. Enable the MIC5301/18. Force the enable pin (J1) high The output load can be either an active or passive load. to enable the output. Do not leave the enable pin floating. Circuit Description A floating enable pin may cause an indeterminate state on the output. The MIC5301/18 single Ultra Low Dropout (ULDO) linear regulator is easy to use. A minimum output 3. Connect the load to V terminal (J5) and ground OUT capacitance of 1F is required. terminals (J4 or J2). The load can be either passive (resistor) or active (electronic load). Be sure to monitor the An input capacitor is required when the power supply is output voltage at the V terminal. OUT more than 4 away from the device. All evaluation boards include an input capacitor within 1 of the device. This is the minimum recommended distance from the device that the capacitor should be placed. MIC5301/18-x.xYMT J1 EN BYP C2 EN 0.1F/25V J4 J2 GND NC GND GND C3 1F/6.3V J5 J3 VIN VOUT VOUT VIN C1 10F/6.3V MIC5301/18YMT Schematic ULDO is a trademark of Micrel, Inc Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC5301/18Evaluation Board Bill of Materials Item Part Number Manufacturer Description Qty. (1) C1608X5R0J106M TDK (2) GRM188R60J106K muRata (3) C1 VJ0805G106KXYCW1BC Vishay 10F, ceramic capacitor, 0603, 6.3V 1 (4) JMK107BJ106MA Taiyo Yuden (5) 06036D106MAT2A AVX (1) C1608X5R1E104M TDK 0.1F, ceramic capacitor, 0603, 6.3V (2) C2 1 GRM188R61E104KA01D muRata 0.1F, ceramic capacitor, 0603, 25V (3) VJ0603Y104KXX Vishay (1) C1608X5R0J105M TDK (2) C3 GRM188R60J105KE19D muRata 1F, ceramic capacitor, 0603, 6.3V 1 (3) VJ0603G105KXYCW1BC Vishay MIC5301YMT or (6) U1 Micrel, Inc. ULDO with Single Output 1 MIC5318YMT Notes: 1. TDK: www.tdk.com 2. muRata: www.murata.com 3. Vishay: www.vishay.com 4. Taiyo Yuden: www. t-yuden.com 5. AVX: : www.avxcorp.com 6. Micrel, Inc.: www.micrel.com March 2007 2 M9999-030707-A