This device is an excellent choice for use in battery-powered applications and portable computers. The SPX features very low quiescent current and a low dropout voltage of 1. As output current decreases, quiescent current flows into the load, increasing efficiency. SPX is available in adjustable or fixed 1.
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This device is an excellent choice for use in battery-powered applications and portable computers. The SPX features very low quiescent current and a low dropout voltage of 1. As output current decreases, quiescent current flows into the load, increasing efficiency.
SPX is available in adjustable or fixed 1. An output capacitor of 10? F provides unconditional stability while a smaller 2.
F capacitor is sufficient for most applications. Internally Limited Lead Temperature soldering, 5 seconds Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. F, unless otherwise specified. The Boldface applies over the full operating temperature range. Current Limit for SPM Line Regulation vs Temperature. F tantalum or ceramic or 10? F aluminum is required. The value may change based on the application requirements of the output load or temperature range.
The value of ESR can vary based on the type of capacitor used in the applications to guarantee stability. The recommended value for ESR is 0. A larger value of output capacitance up to ? F can improve the load transient response. During soldering, the non-active or mildly active fluxes may be used.
The SPX die is attached to the heatsink lead which exits opposite the input, output, and ground pins. Figure The SPX features the internal thermal limiting to protect the device during overload conditions. Refer to table 1 for the results of the experiment. The thermal interaction from other components in the application can effect the thermal resistance of the SPX The actual thermal resistance can be determined with experimentation.
Ripple Rejection Ripple rejection can be improved by adding a capacitor between the ADJ pin and ground as shown in Figure When ADJ pin bypassing is used, the value of the output capacitor required increases to its maximum.
If the ADJ pin is not bypassed, the value of the output capacitor can be lowered to 10? F for an electrolytic aluminum capacitor or 2. F for a ceramic or solid tantalum capacitor Fig If an ADJ-bypass capacitor is used, the amplitude of the output ripple will be independent of the output voltage. TO AMB. Layout Considerations Parasitic line resistance can degrade load regulation. For the same reason, R2 should be connected to the negative side of the load.
Output Voltage The output of the adjustable regulator can be set to any voltage between 1. A small correction to this formula is required depending on the values of resistors R1 and R2, since the adjustable pin current approx 50?
A flows through R2. Current Source Figure Improving Ripple Rejection Figure Refer To Applicable Symbol List. Lead Dimension Uncontrolled in L3 4. Tab Contour Optional Within Dim. L is the Termal Length for Soldering. Controlling Dimension: Inch 8. To order add "-L" suffix to part number. Example: SPXM Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
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