SC4524SETRT Semtech, SC4524SETRT Datasheet
SC4524SETRT
Specifications of SC4524SETRT
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SC4524SETRT Summary of contents
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... Fully WEEE and RoHS Compliant Applications u XDSL and Cable Modems u Set-top Boxes u Point of Load Applications u CPE Equipment u DSP Power Supplies u Disk Drives D1 C2 1N4148 0.1mF L1 OUT 4.7mH 5V/2A R1 22. 20BQ030 5.49k 22mF 1 SC4524 Efficiency 0.0 0.5 1.0 1.5 Load Current (A) www.semtech.com 2.0 ...
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... Electrical Characteristics section is not implied < Notes: This device is ESD sensitive. ESD handling precaution is required. Electrical Characteristics Unless specified: -40°C < T < 85°C, -40°C < 2006 Semtech Corp < 105° 12. 5V OSC IN BST SC4524 www.semtech.com ° C ° ° ° C ° C ° µ µ ...
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... Notes: (1) Guaranteed by design, not tested in production. (2) The maximum duty cycle specified corresponds to 1.4MHz switching frequency. Duty cycles higher than those specified can be achieved by lowering the operating frequency. 2006 Semtech Corp. < 105° 12. 5V OSC IN BST SC4524 µ µ µ µ µ ...
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... Pin SOIC -EDP) Underside metal must be soldered to ground. Pin Descriptions 2006 Semtech Corp. Ordering Information BST S FB COMP Notes: SS (1) Only available in tape and reel packaging. A reel contains 2500 devices. (2) Lead free product. This product is fully WEEE and RoHS compliant ...
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... POWER MANAGEMENT Block Diagrams COMP ROSC 0.7V 0. FAULT FAULT Figure 3. Details of the Soft-Start and Overload Hiccup Control Circuit 2006 Semtech Corp SLOPE COMP + S PWM 0.7V REFERENCE FAULT & THERMA L SHUTDOW N SLO PE COMP SLOPE COMP CLK OSCILLATOR Figure 2. SC4524 Functional Diagram + + - - 1 ...
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Ur € ƒr …h ‡ˆ…r Ã8 Ur €ƒr…h‡ˆ…rÃ8 6 à ‡ v € à G ‡ r … ...
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& ã # " $ U Ã2Ã!$ƒ ...
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W ã ...
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287 = 287 = = 287 = W ¼ ¼ ¼ ÔÏ D 287 = 287 ã ...
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.+] ...
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¼ ...
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D BST + 6: & %67 = & % % 5(&7 b ...
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... V BST IN OUT BST VIN IN SW SC4524 GND (a) DBST DZ MAX V BST + VZ - BST VIN SW IN SC4524 GND (c) 2006 Semtech Corp OUT » loss Since V OUT >2.5V) to maximize efficiency. In general efficiency T ON penalty increases as D decreases. . The energy loss b Figure 7 summarizes various ways of bootstrapping the ...
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... Load Current (mA) (a) Figure 8. Minimum Input Voltage Required to Start and to Maintain Bootstrap.(T 2006 Semtech Corp. 5V and a 3.3V converters on the load current. Once started the bootstrap circuit is able to sustain itself down to zero load. Shutdown and Soft-Start will BST T Pulling the soft-start pin below 0.8V with an open- collector NPN or an open-drain NMOS transistor turns off the regulator. In “ ...
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... Figure 9(b). Start-up Fails due to (i) Short Soft-start Duration or (ii) Output Overload or (iii) Output Short-circuited. 2006 Semtech Corp. Overload / Short-Circuit Protection The current limit comparator in the SC4524 limits the peak inductor current to 3.2A (typical). The regulator output voltage will fall if the load is increased above the current limit ...
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W 287 w 287 287 Î Ë Û Ì Ì Ü Ü = Ï ÔÏ Í Ý Ð 287 ...
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... Figure 10. Simplified Control Loop Equivalent Circuit Gain OUT Figure 11. Bode Plots of Control-to-Ouput, Output-to-Control and the Overall Loop Gain. Control-to-output transfer function is shown with two poles near half the switching frequency 2006 Semtech Corp. POWER STAGE -1 GMP = 8 C11 GMA = -1 280 + 1.6M VOLTAGE C5 REFERENCE OUT ...
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S 5 & & ¼ & ...
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N Û ™ ¼ Ì Ü Ì Ü ¼ ¼ ¼ Í Ý ...
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G‚h qÃ8uh …h p‡r …v†‡vp G‚h qÃ8uh …h p‡r …v†‡ ...
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... CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MS-012, VARIATION BA. Land Pattern - SOIC-8 EDP THERMAL VIA Ø 0.36mm Contact Information 2006 Semtech Corp DIM MIN A .053 2X E/2 A1 .000 A2 ...