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SS23 数据表(PDF) 3 Page - Monolithic Power Systems |
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SS23 数据表(HTML) 3 Page - Monolithic Power Systems |
3 / 10 page MP1580 – 2A, 380KHz STEP-DOWN CONVERTER MP1580 Rev. 3.0 www.MonolithicPower.com 3 12/5/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. TM ELECTRICAL CHARACTERISTICS (continued) VIN = 12V, TA = +25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Maximum Duty Cycle VFB = 1.0V 90 % Minimum Duty Cycle VFB = 1.5V 0 % EN Shutdown Threshold Voltage ICC > 100µA 0.7 1.0 1.3 V Enable Pull-Up Current VEN = 0V 1.15 1.46 1.8 µA EN UVLO Threshold Rising VEN Rising 2.37 2.495 2.62 V EN UVLO Threshold Hysteresis 210 mV Supply Current (Shutdown) VEN ≤ 0.4V 23 36 µA Supply Current (Quiescent) VEN ≥ 2.6V, VFB = 1.4V 1.0 1.2 mA Thermal Shutdown 160 °C Note: 4) Derate current limit 0.011A/°C. PIN FUNCTIONS Pin # Name Description 1 BS Bootstrap (C5). This capacitor is needed to drive the power switch’s gate above the supply voltage. It is connected between SW and BS pins to form a floating supply across the power switch driver. The voltage across C5 is about 5V and is supplied by the internal +5V supply when the SW pin voltage is low. 2 IN Supply Voltage. The MP1580 operates from a +4.75V to +25V unregulated input. C1 is needed to prevent large voltage spikes from appearing at the input. 3 SW Switch. This connects the inductor to either IN through M1 or to GND through M2. 4 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 C1 ground path to prevent switching current spikes from inducing voltage noise into the part. 5 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 foldback comparator lowers the oscillator frequency when the FB voltage is below 700mV. 6 COMP Compensation. This node is the output of the transconductance error amplifier and the input to the current comparator. Frequency compensation is done at this node by connecting a series R-C to ground. See the compensation section for exact details. 7 EN Enable/UVLO. A voltage greater than 2.62V enables operation. For complete low current shutdown the EN pin voltage needs to be less than 700mV. 8 SYNC Synchronization Input. This pin is used to synchronize the internal oscillator frequency to an external source. There is an internal 11kΩ pull down resistor to GND; therefore leave SYNC unconnected if unused. |
类似零件编号 - SS23 |
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类似说明 - SS23 |
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