SC4519HSETRT Semtech, SC4519HSETRT Datasheet
SC4519HSETRT
Specifications of SC4519HSETRT
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SC4519HSETRT Summary of contents
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... Synchronizable to higher frequency up to 1.2MHz Precision enable threshold SO-8 EDP package. Lead free product, fully WEEE and RoHS compliant Applications XDSL modems CPE equipment DC-DC point of load applications Portable equipment 1 BST SC4519H SYNC COMP GND SC4519H 600kHz, 3A Step-Down Switching Regulator www.semtech.com VOUT ...
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... ThetaJA is calculated from a package in still air, mounted to 3" x 4.5", 4 layer FR4 PCB with thermal vias under exposed pad per JESD51 standards. Electrical Characteristics Unless specified 12V 0.8V COMP BST -40°C to 125° 2007 Semtech Corp should be within maximum Operating Input Voltage as defined in Electrical 5V tied SYNC = open ° ...
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... POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified 12V 0.8V COMP BST -40°C to 125° 2007 Semtech Corp 5V tied SYNC = open < V < µ SC4519H www.semtech.com µ µ µ µ ...
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... The device may not function properly outside its operating input voltage range. (2) The required minimum input voltage for a regulated output depends on the output voltage and load condition. (3) Guaranteed by design. (4) Please contact factory for SYNC applications. 2007 Semtech Corp 5V tied SYNC = open. ...
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... GND 4 5 (SO-8 EDP) Pin Descriptions 2007 Semtech Corp. Ordering Information SYNC Notes: COMP (1) Only available in tape and reel packaging. A reel FB contains 2500 devices. (2) Lead free product. This product is WEEE and EN RoHS compliant. (3) Consult factory for all other available options ...
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... POWER MANAGEMENT Block Diagram COMP COMP - - SYNC SYNC OSCILLATOR OSCILLATOR Typical Characteristic - OCP Limit 7 6.5 6 5.5 5 4.5 4 3 2007 Semtech Corp SLOPE SLOPE + + PWM PWM UVLO UVLO REFERENCE REFERENCE SOFT START SOFT START HICCUP HICCUP 0.7V 0.7V SLOPE SLOPE FB FB ...
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... A. During the shut down µ mode, the switch is turned off. The SC4519H is turned on if the EN pin is pulled high. 2007 Semtech Corp. Oscillator Its internal free running oscillator sets the PWM frequency at 600kHz for the SC4519H without any external components to program the frequency. An external clock with a duty cycle from 20% to 80% connected to the SYNC pin activates synchronous mode ...
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... V = output voltage. O 2007 Semtech Corp. The peak to peak inductor current is: After the required inductor value is selected, the proper selection of the core material is based on the peak inductor current and efficiency specifications. The core ...
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... Where the switching frequency and s Dmax = maximum duty ratio, 0.85 for the SC4519H. The required minimum capacitance for the boost capacitor will be boost 2007 Semtech Corp. Where the boost current and discharge ripple voltage. D With f = 600kHz minimum capacitance for the boost capacitor is: ...
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... C – Output capacitor. The goal of the compensation design is to shape the loop to have a high DC gain, high bandwidth, enough phase margin, and high attenuation for high frequency noises. Figure 3 gives a typical compensation network which offers 2 poles and 1 zero to the power stage: 2007 Semtech Corp SYNC Figure 3 ...
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... P2 s the switching ripple and high frequency noise with the adequate phase lag at C. 2007 Semtech Corp. Layout Guidelines: In order to achieve optimal electrical and thermal Loop gain T(s) performance for high frequency converters, special attention must be paid to the PCB layouts. The goal of ...
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... POWER MANAGEMENT Application Information (Cont.) Design Example: 16V =16V =16V 4.75k 4. 4.75k 10u 10u 2007 Semtech Corp SC4519H SC4519H SC4519H SYNC SYNC SYNC COMP COMP COMP C5 C5 180p 180p SC4519H 0.22u 0.22u 0.22u =5V = 8.2uH 8.2uH 8.2uH 10u 10u 10u 52. 3.3n 3.3n 3 ...
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... POWER MANAGEMENT Application Information (Cont.) (COMPONENT - TOP) (PCB - TOP) 2007 Semtech Corp. (COMPONENT - BOTTOM) (PCB - BOTTOM) 13 SC4519H 8 8 SC4518 www.semtech.com ...
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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-8L EDP THERMAL VIA Ø 0.36mm Contact Information Phone: (805)498-2111 FAX (805)498-3804 2007 Semtech Corp DIM MIN A .053 2X E/2 A1 ...