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MP2490CP Datasheet(PDF) 4 Page - Monolithic Power Systems |
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MP2490CP Datasheet(HTML) 4 Page - Monolithic Power Systems |
4 / 13 page MP2490 – 1.5A, 36V, 700KHz STEP-DOWN WITH PROGRAMMABLE OUTPUT CURRENT LIMIT MP2490 Rev. 0.92 www.MonolithicPower.com 4 4/23/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. PIN FUNCTIONS QFN10-3 Pin # SOIC-8 / PDIP-8 Pin# Name Description 1 1 VIN Supply Voltage. The MP2490 operates from a +4.5V to +36V unregulated input. CIN is needed to prevent large voltage spikes from appearing at the input. Put CIN as close to the IC as possible. It is the drain of the internal power device and power supply for the whole chip. 2 2 GND Ground. This pin is the voltage reference for the regulated output voltage. For this reason care must be taken in its layout. This node should be placed outside of the D1 to CIN ground path to prevent switching current spikes from inducing voltage noise into the part. 3 EN On/Off Control Input. (Only available for the MP2490DQ) 4 3 FB Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets the output voltage. To prevent current limit run away during a short circuit fault condition the frequency-fold-back comparator lowers the oscillator frequency when the FB voltage is below 250mV. 5 4 SS Connect to an external capacitor used for Soft-Start and compensation for current limiting loop. 6 5 ISN Negative Current Sense Input for load current limiting. 7 6 ISP Positive Current Sense 8 PGOOD Power good signal. When FB is less than 90% of 0.8V, PGOOD is low. It is an open-drain output. Use a high value pull-up resistor externally to pull it up to system power supply. 9 7 BST Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply voltage. It is connected between SW and BST pins to form a floating supply across the power switch driver. An on-chip regulator is used to charge up the external boot-strap capacitor. If the on-chip regulator is not strong enough, one optional diode can be connected from IN or OUT to charge the external boot-strap capacitor. 10 8 SW Switch Output. It is the source of power device. |
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