MIC5283YML Evaluation Board 120VIN, 150mA, Ultra Low IQ, High-PSRR LDOs General Description Getting Started The MIC5283 is a high–performance, low–dropout linear regulator featuring a very-low noise output and a very-wide input voltage range (6V to 120V). The MIC5283 supplies an output current of up to 150mA and is offered in both fixed output voltage (3.3V/5.0V) and adjustable output voltage (1.22V to 5.5V) options. Ideal for high input voltage applications such as industrial and telecom, the MIC5283 offers ±3% initial accuracy, extremely-high power supply rejection ratio (>80dB) and ultra-low quiescent current (6µA typical). The MIC5283 is optimized for line transient response, which makes it ideal for harsh environment applications. 1. Connect an external supply to VIN terminal. Apply desired input voltage to the VIN and ground terminals 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. Ensure that the supply voltage is monitored at the VIN terminal. The ammeter and/or power lead resistance can reduce the voltage supplied to the input. 2. Connect the load to the VOUT and ground terminals. The load can be either passive (resistive) or active (as in an electronic load). An ammeter can be placed between the load and the VOUT terminal. Ensure that the output voltage is monitored at the VOUT terminal. The VOUT can be adjusted by changing the feedback resistors (see “Output Voltage” section). 3. Enable the MIC5283. The EN pin is provided on the evaluation board with a 10K pull-up resistor. The output of the MIC5283 may be turned off by shorting the EN pin to ground. An external connection on the board provides easy access to the enable pin. Removing the pull-up resistor and leaving the EN pin floating will cause the regulator to operate in an indeterminate state. The MIC5283 operates over the 40ºC to +125ºC temperature range, and is available in lead-free, RoHS® compliant, ePad SOIC-8 and 3mmx3mm MLF packages. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Requirements The MIC5283 evaluation board requires a supply to provide VIN. The VIN power supply to deliver a minimum of 6V and more capability. The output load can either be passive load. single power must be able than 150mA an active or Precautions The evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN terminal may damage the device. In addition, the maximum VIN operating voltage of the MIC5283 evaluation board is 120V. Exceeding 120V on VIN could permanently damage the device. Ordering Information Part Number Description MIC5283YML EV Evaluation board featuring the 150mA MIC5283YML with adjustable output 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 March 2012 M9999-031412-A Micrel, Inc. MIC5282YML Evaluation Board The output voltage can easily be modified by removing R1, R2, and RFB2 and replacing them with the values that yield the desired output voltage. Once the values for RFB1 are selected, RFB2 can be calculated using: Application Information Output Voltage The output voltage on the MIC5283YML evaluation board is adjustable. The output is set by connecting one of the feedback resistors into the circuit via a jumper short. The output voltage can be programmed to 1.8V, 2.5V, 3.3V, or 5V. The output voltage for the MIC5283 evaluation board is set at the factory for a 5V output. In general, the output voltage can be calculated using the following equation: V OUT V REF 1 R R FB1 V OUT V REF V REF For VREF = 1.22V: R FB2 R FB2 FB1 R FB2 R V OUT FB1 1.22V where VREF = 1.22V, RFB1 is the total resistance of the top side resistor combination (R1 + R2) in the feedback resistor divider shown in the circuit schematic, and RFB2 is the resistor that will be connected from FB to ground, either R3, R4, R5, or R6 in the circuit schematic. March 2012 2 M9999-031412-A Micrel, Inc. MIC5282YML Evaluation Board Evaluation Board Schematic MIC5283YML Evaluation Board (J1 is for test purposes only) March 2012 3 M9999-031412-A Micrel, Inc. MIC5282YML Evaluation Board Bill of Materials Item Part Number Manufacturer Description Qty. C1 C5750X7R2E105M TDK(1) 1.0µF, 250V, 20%, X7R capacitor (2220) 1 C2 08053C104KAT2A AVX(2) 0.1µF 25V 20%, X7R capacitor (0805) 1 C3 0805ZD106KAT2A AVX(2) 10µF, 10V, 20%, X5R, capacitor (0805) 1 R1 CRCW06030000F Vishay/Dale(3) 0, 1% resistor, 0603 1 R2 CRCW06032942F Vishay/Dale(3) 29.4k, 1% resistor, 0603 1 (3) R3 CRCW06039531F Vishay 9.53kΩ Film Resistor, Size 0603, 1% 1 R4 CRCW06031742F Vishay(3) 17.4kΩ Film Resistor, Size 0603, 1% 1 R5 CRCW06032802F (3) Vishay 28.0kΩ Film Resistor, Size 0603, 1% 1 R6 CRCW06036192F Vishay(3) 61.9kΩ Film Resistor, Size 0603, 1% 1 120VIN, 150mA, Ultra-Low IQ, High-PSRR Linear Regulator 1 U1 MIC5283YML Micrel (4) Notes: 1. TDK: www.tdk.com. 2. AVX.: www.avx.com. 3. Vishay Tel: www.vishay.com. 4. Micrel, Inc.: www.micrel.com March 2012 4 M9999-031412-A Micrel, Inc. MIC5282YML Evaluation Board Evaluation Board PCB Layout MIC5283YML Evaluation Board – Top Silkscreen Layer MIC5283YML Evaluation Board – Top Layer March 2012 5 M9999-031412-A Micrel, Inc. MIC5282YML Evaluation Board Evaluation Board PCB Layout (Continued) MIC5283YML Evaluation Board – Bottom Layer MIC5283YML Evaluation Board – Bottom Silkscreen March 2012 6 M9999-031412-A Micrel, Inc. Xxxxxxx 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 Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. 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. © 2011 Micrel, Incorporated. March 2012 7 M9999-031412-A