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7440530047 データシート(PDF) 3 Page - Monolithic Power Systems |
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7440530047 データシート(HTML) 3 Page - Monolithic Power Systems |
3 / 9 page MP2359 – 1.2A, 24V, 1.4MHz STEP-DOWN CONVERTER IN A TSOT23-6 MP2359 Rev. 1.1 www.MonolithicPower.com 3 6/23/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. TM PIN FUNCTIONS Pin # Name Description 1 BST Bootstrap. A capacitor is connected between SW and BS pins to form a floating supply across the power switch driver. This capacitor is needed to drive the power switch’s gate above the supply voltage. 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 C1 ground path to prevent switching current spikes from inducing voltage noise into the part. 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 foldback comparator lowers the oscillator frequency when the FB voltage is below 250mV. 4 EN On/Off Control Input. Pull EN above 1.2V to turn the device on. 5 IN Supply Voltage. The MP2359 operates from a +4.5V to +24V unregulated input. C1 is needed to prevent large voltage spikes from appearing at the input. 6 SW Switch Output. TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, VOUT = 3.3V, L = 4.7µH, C1 = 10µF, C2 = 22µF, TA = +25ºC, unless otherwise noted. Efficiency vs Load Current VIN = 12V VIN = 24V VOUT = 5V 100 90 80 70 60 50 40 30 20 10 0 LOAD CURRENT (A) 100 90 80 70 60 50 40 30 20 10 0 0.01 0.1 1 10 LOAD CURRENT ( A) Efficiency vs Load Current VIN = 18V VIN = 24V VOUT = 2.5V Feedback Voltage vs Die Temperature 0.820 0.818 0.816 0.814 0.812 0.810 0.808 0.806 0.804 0.802 0.800 DIE TEMPERATURE (OC) -50 -25 0 25 75 100 125 50 150 Switching Frequency vs Die Temperature 1.50 1.48 1.46 1.44 1.42 1.40 1.38 1.36 1.34 1.32 1.30 DIE TEMPERATURE (OC) -50 -25 0 25 75 100 125 50 150 0.01 0.1 1 10 |
同様の部品番号 - 7440530047 |
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同様の説明 - 7440530047 |
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