mic5331 evaluation board micro-power high performance dual 300ma uldo? uldo is a trademark of micrel, inc. mlf and micro leadframe 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 2008 m9999-030408-a general description the mic5331 is a tiny dual output, low quiescent current ldo. the mic5331 provides two high performance 300ma ldos in a tiny 8 pin 2mm x 2mm thin mlf ? package. the mic5331 dual ultra low dropout (uldo?) linear regulator is easy to use. a small output capacitance of only 1f for each of the outputs is required. an input capacitor may be r equired when the power supply is more than 4-inches away from the device. the evaluation board includes an in put capacitor of 1f to compensate for long inductive test leads. requirements the mic5331 evaluation boar d requires an input power source that is able to deliver at least 600ma at a voltage within the range of 2.3v 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 v in terminal may damage the device. the mic5331 evaluation board is tailored for a li-ion range input supply voltage. it should not exceed 5.5v on the input. getting started 1. connect an external supply to v in . apply the desired input voltage to the v in (j1) and ground terminal (j2) of the evaluation board, paying careful attention to polarity and supply voltage (2.3v v in 5.5v). an ammeter may be placed between the input supply and the v in terminal to the evaluation board to accurately monitor the input current. the ammeter and/or power lead resistance can reduce the voltage supplied to the input so monitor the supply voltage at the v in terminal.. 2. enable/disable the mic5331 . the evaluation board is set up for default enable on both outputs with a 10k pull up resistor on each of the enable pins (en1 and en2) to v in . to disable an output, simply jumper the en terminal (j5 for ldo1, j4 for ldo2) to the gnd terminal (j2) . the enable pins must be either pulled high or low for proper operation. removing the pull up resistors and leaving the pins floating will cause the regulators to operate in an indeterminate state . 3. connect the loads to the v out terminals (j6 for ldo1, j8 for ldo2) and ground terminal (j7). the load can be either a passive (resistor) or active (electronic load). be sure to monitor the output voltage at the v out (j6 and j8) terminals. ordering information part number description mic5331-xxymt ev evaluation board with the 300ma dual uldo? device downloaded from: http:///
micrel, inc. mic5331 evaluation board march 2008 2 m9999-030408-a evaluation board schematic bill of materials item part number manufacturer description qty c1, c2, c3 c1608x5r0j105k tdk (1) capacitor, 1f ceramic, 6.3v, x5r, size 0603 3 r2, r3 crcw06031002fkeye3 vishay (2) resistor, 10k ? , 1%, 1/16w, size 0603 2 u1 mic5331-xxymt micrel (3) ucap ldo, dual 300ma, size 2mm x 2mm thin mlf ? 1 notes: 1. tdk: www.tdk.com 2. vishay: www.vishay.com 3. micrel, inc.: www.micrel.com vin gnd vout1 nc u1mic5331-xxymt ncen1 vout2 en2 r3 10k vin c1 1f c2 1f c3 1f j1 vin j4 en2 j5 en1 j2 gnd j6vout1 j7gnd j8vout2 1 3 5 2 4 8 7 6 r2 10k downloaded from: http:///
micrel, inc. mic5331 evaluation board march 2008 3 m9999-030408-a pcb layout recommendations 1400 (mil) 1350 (mil) top layer 1400 (mil) 1350 (mil) bottom layer downloaded from: http:///
micrel, inc. mic5331 evaluation board march 2008 4 m9999-030408-a 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 belie ved to be accurate and reliable. however, no responsibility is a ssumed 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 authori zed for use as components in life support appliances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. life suppo rt devices or systems are devices or systems that (a) are int ended 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 significan t injury to the user. a purchasers use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2007 micrel, incorporated. downloaded from: http:///
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