MIC5374/84 Evaluation Board Triple 200mA µCap LDO and 1mA RTC LDO in 2.5mm x 2.5mm Thin MLF® General Description The MIC5374/84 is an advanced, general purpose, four output device with three 200mA LDOs and a Real Time Clock (RTC) 1mA LDO, which is ideal for application processor support in mobile platforms. The MIC5374 provides independent control active high enables for each of the LDO outputs with the 1mA RTC LDO always enabled. The MIC5384 provides active low enables. The MIC5374/84 incorporates a Power-On-Reset (POR) supervisor with adjustable delay time set by an external capacitor, and an independent input pin to monitor any voltage level. Once high, the POR output can be asserted low again by enabling the Manual Reset (MR) pin. When the MR pin is restored low the POR output will re-time the delay set by the external delay capacitor. An input capacitor is required when the power supply is more than four inches from the device. The evaluation board includes an input capacitor of 10µF to compensate for long inductive test leads. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Requirements The MIC5374/84 evaluation board requires two power supplies. The first supply must be able to provide a minimum of 800mA with a voltage range of 1.7V to 5.5V to the INLDO pins. The second supply for VBIAS must be able to supply 10mA with a voltage range of 2.5V to 5.5V. For input voltages of 2.5V or greater a single supply can be used for both the INLDO and VBIAS. The output load can be either active or passive. Precautions The MIC5374/84 evaluation board does not have reverse polarity protection. Applying a negative voltage to the INLDO or VBIAS terminals may damage the device. • Connect an External Supply to INLDO. Apply the desired input voltage to the INLDO (J4 for LDO1 and LDO2, J5 for LDO3, and J3 for LDO4) and ground (J2, J6, J11, and J13) terminals of the evaluation board, paying careful attention to polarity and supply voltage (1.7V ≤ INLDO ≤ 5.5V). An ammeter can be placed between the input supply and the INLDO terminal of the evaluation board. Ensure that the supply voltage is monitored at the INLDO terminals. The ammeter and/or power lead resistance can reduce the voltage supplied to the input. • Enable/Disable the MIC5374/84. The MIC5374 evaluation board is supplied with 100KΩ pull up resistors (R1, R2, R3) on the EN1, EN2, and EN3 pins for default on state. While the MIC5384 has pull down resistors (R1b, R2b, R3b) for default on state. To disable the MIC5373 jumper the enable terminal (J15 for LDO1, J16 for LDO2, and J17 for LDO3) to GND. To disable the MIC5383 jumper the enable terminal (J15 for LDO1, J16 for LDO2, and J17 for LDO3) to VBIAS. The RTC (LDO4) is always enabled when both VBIAS and INLDO4 are provided. The enable pins must be either pulled high or low. Leaving enable pins floating will cause the regulator to operate in an indeterminate state. • Connect the Load. Connect the loads to the VOUT terminals (J7 for LDO1, J8 for LDO2 and J9 for LDO3) and ground terminals (J2, J6, J11, or J13). The loads can be either passive (resistor) or active (electronic load). Be sure to monitor the output voltage at the VOUT (J7, J8 and J9) terminals. Ordering Information Part Number Description MIC5374-SJG1YMT EV Triple Output LDO with RTC Evaluation Board. VOUT1 = 3.3V, VOUT2 = 2.5V, VOUT3 = 1.8V, VOUT4 = 1.0V. Active High Enables. MIC5384-MG44YMT EV Triple Output LDO with RTC Evaluation Board. VOUT1 = 2.8V, VOUT2 = 1.8V, VOUT3 = 1.2V, VOUT4 = 1.2V. Active Low Enables. Getting Started • Connect an External Supply to VBIAS. Apply the desired input voltage to the VBIAS (J1) and ground (J2) terminal of the evaluation board, paying careful attention to polarity and supply voltage (2.5V ≤ VBIAS ≤ 5.5V). 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 September 2010 M9999-092410-A Micrel, Inc. Application Information Power-On-Reset (POR) The Power-On-Reset (POR) pin is an open drain output. A 100kΩ pull up resistor to VBIAS is provided. POR is asserted high when the voltage at DLY reaches 1.25V. A delay can be added by placing a capacitor from the DLY pin to ground. Power-On-Reset Input (POR_IN) The Power-On-Reset Input (POR_IN) pin compares any voltage to an internal 0.9V reference. This function can be used to monitor any of the LDO outputs or any external voltage rail. When the monitored voltage is greater than 0.9V, the POR_IN flag will internally trigger a 1.25µA source current to charge the external capacitor at the DLY pin. A resistor divider network (R5 – R8) is provided to divide down the monitored voltage to be compared with the 0.9V at the POR_IN. The monitored voltage can be selected by changing the jumpers (TP2 for VOUT3, TP3 for VOUT2, and TP4 for VOUT1). The resistor divider network can be changed to set the trigger point to any voltage level. A small decoupling capacitor (C9) of 10nF is recommended between POR_IN and ground to reject high frequency noise that might interfere with the POR circuit. Do not leave the POR_IN pin floating if the POR output is being monitored. A floating POR_IN pin will cause an indeterminate state on the POR pin. September 2010 MIC5374/84 Evaluation Board Delay (DLY) The Delay (DLY) pin is used to set the POR delay time. Adding a capacitor to this pin (C10) adjusts the delay of the POR signal. When the POR_IN flag is triggered, a constant 1.25µA current begins to charge the external capacitor tied to the DLY pin. When the capacitor reaches 1.25V the POR will be pulled high by the external pull up resistor. The equation to calculate the charge time is shown: ⎛ 1.25V x C DLY t DELAY (s) = ⎜⎜ ⎝ 1.25x10 −6 ⎞ ⎟⎟ ⎠ The delay time (tDELAY) is in seconds, the delay voltage is 1.25V internally, and the external delay capacitance (CDLY) is in microfarads. For a 1µF delay capacitor, the delay time will be 1 second. A capacitor at the DLY pin is recommended when the POR function is used in order to prevent unexpected triggering of the POR signal in noisy systems. Manual Reset (MR) The Manual Reset (MR) pin resets the output of POR and DLY generator regardless if the monitored voltage is in regulation or not. Applying a voltage greater than 1.2V on the MR pin will cause the POR voltage to be pulled low. When a voltage below 0.2V is applied to the MR pin, the internal 1.25µA will begin to charge the DLY pin until it reaches 1.25V. When the DLY pin reaches 1.25V, the POR voltage will be pulled high by the pull up external resistor again. Do not leave the MR pin floating. A 100kΩ pull-down resistor (R4) is provided on the evaluation board to ensure that the manual reset is disabled. 2 M9999-092410-A Micrel, Inc. MIC5374/84 Evaluation Board MIC5374 Evaluation Board Schematic Bill of Materials Item C1 − C4 Part Number C1608X5R0J106K GRM155R1A1055KE19D C5 − C8 0402ZD105KAT2A LMK105BJ105KV-F R1 − R5, R10 CRCW0402100KFKEA Manufacturer TDK (1) Qty. 10μF, Ceramic, 6.3V, X5R, Size 0603 Capacitor (2) Murata 4 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor AVX(3) Taiyo Yuden Description 4 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor (4) 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor (5) 100KΩ, 1%, 1/16W, Size 0402 Resistor 6 (5) Vishay R6 CRCW0402180KFKEA Vishay 180KΩ, 1%, 1/16W, Size 0402 Resistor 1 R7 CRCW040280K6FKEA Vishay(5) 80.6KΩ, 1%, 1/16W, Size 0402 Resistor 1 R8, R9 CRCW040220K0FKEA (5) 20KΩ, 1%, 1/16W, Size 0402 Resistor 2 U1 MIC5374-SJG1YMT High-Performance, Triple-Output, 200mA LDO with RTC 1mA LDO, Active High Enable 1 Vishay Micrel, Inc.(6) Notes: 1. TDK: www.tdk.com. 2. Murata: www.murata.com. 3. AVX: www.avx.com. 4. Taiyo Yuden: www.t-Yuden.com. 5. Vishay: www.vishay.com. 6. Micrel, Inc.: www.micrel.com. September 2010 3 M9999-092410-A Micrel, Inc. MIC5374/84 Evaluation Board MIC5384 Evaluation Board Schematic Bill of Materials Item C1 − C4 Part Number C1608X5R0J106K GRM155R1A1055KE19D C5 − C8 0402ZD105KAT2A LMK105BJ105KV-F Manufacturer TDK (1) Description Qty. 10μF, Ceramic, 6.3V, X5R, Size 0603 Capacitor (2) Murata 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor AVX(3) 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor Taiyo Yuden (4) 4 4 1μF, Ceramic, 10V, X5R, Size 0402 Capacitor R1b, R2b, R3b, R4, R5, R10 CRCW0402100KFKEA Vishay (5) 100KΩ, 1%, 1/16W, Size 0402 Resistor 6 R6 CRCW0402180KFKEA Vishay(5) 180KΩ, 1%, 1/16W, Size 0402 Resistor 1 CRCW040280K6FKEA (5) 80.6KΩ, 1%, 1/16W, Size 0402 Resistor 1 20KΩ, 1%, 1/16W, Size 0402 Resistor 2 High-Performance, Triple-Output, 200mA LDO with RTC 1mA LDO, Active Low Enable 1 R7 R8, R9 U1 CRCW040220K0FKEA MIC5384-MG44YMT Vishay (5) Vishay Micrel, Inc. (6) Notes: 1. TDK: www.tdk.com. 2. Murata: www.murata.com. 3. AVX: www.avx.com. 4. Taiyo Yuden: www.t-Yuden.com. 5. Vishay: www.vishay.com. 6. Micrel, Inc.: www.micrel.com. September 2010 4 M9999-092410-A Micrel, Inc. MIC5374/84 Evaluation Board PCB Layout Recommendations Top Layer Bottom Layer September 2010 5 M9999-092410-A Micrel, Inc. MIC5374/84 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 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. © 2010 Micrel, Incorporated. September 2010 6 M9999-092410-A