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MP2499DS Datasheet(PDF) 4 Page - Monolithic Power Systems |
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MP2499DS Datasheet(HTML) 4 Page - Monolithic Power Systems |
4 / 12 page MP2499– INTEGRATED 100V LOAD DUMP PROTECTION, 2A STEP DOWN REGULATOR MP2499 Rev. 0.91 www.MonolithicPower.com 4 11/24/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. PIN FUNCTIONS PIN # Name Description 1 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. 2 SS Connect to an external capacitor used for Soft-Start and compensation for current limiting loop. 3 ISP Positive Current Sense 4 ISN Negative Current Sense Input for load current limiting. 5 CTR Control pin. Tie a zener diode from CTR to ground. The zener voltage should equal to normal output voltage. 6 N/C No connection 7 IN Input. Connect input power supply, which may have surge voltage to IN pin. 8 IN Input. Connect input power supply, which may have surge voltage to IN pin. 9 OUT Output Pin. Connect to VDD pin. 10 OUT Output Pin. Connect to VDD pin. 11 N/C No connection 12 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 bootstrap capacitor. If the on-chip regulator is not strong enough, an optional diode can be connected from IN or OUT to charge the external bootstrap capacitor. 13 SW Switch Output. It is the source of power device. 14 VDD Supply Voltage Bypass pin. This pin is also the output of the OV protection switch. The MP2499 operates from a +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. 15 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. 16 EN On/Off Control Input. |
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