EL7551CU ELANTEC [Elantec Semiconductor], EL7551CU Datasheet
EL7551CU
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EL7551CU Summary of contents
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... Package Tape & Reel Outline # EL7551CU 16-Pin QSOP MDP0040 Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation. © ...
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EL7551C - Preliminary Monolithic 1 Amp DC:DC Step-down Regulator Absolute Maximum Ratings Supply Voltage between and GND Voltage LX Input Voltage V Voltage HI Important Note: All parameters having Min/Max specifications are guaranteed. Typ ...
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Pin Descriptions Pin Number Pin Name 1 SGND Control circuit negative supply. 2 COSC Oscillator timing capacitor. FOSC can be approximated by: FOSC (kHz) = 0.1843/COSC, COSC in µF. 3 VDD Control circuit positive supply. 4 PGND Ground return of ...
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EL7551C - Preliminary Monolithic 1 Amp DC:DC Step-down Regulator Typical Performance Curves Efficiency =5V IN 100 V =2.5V V =1. =1. =3. =500kHz ...
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Typical Performance Curves Oscillator Frequency vs Temperature 390 385 380 375 370 365 360 - Temperature (°C) Switching Frequency vs C OSC 1400 1200 1000 800 600 400 200 0 0 200 400 600 C (pF) OSC Transient ...
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EL7551C - Preliminary Monolithic 1 Amp DC:DC Step-down Regulator Typical Performance Curves Power-Down V =5V, V =3.8V Shut-Down V =5V, V =3.8V ...
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Block Diagram VREF Voltage Reference Controller Supply 39 VDD 0.1µF EN SGND FB EL7551C - Preliminary Monolithic 1 Amp DC:DC Step-down Regulator 0.1µF 270pF COSC Thermal VDRV Oscillator Shut-down VHI VIN Power FET PWM Drivers Controller Power FET PGND Current ...
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EL7551C - Preliminary Monolithic 1 Amp DC:DC Step-down Regulator Applications Information Circuit Description General The EL7551C is a fixed frequency, current mode con- trolled DC:DC converter with integrated N-channel power MOSFETs and a high precision reference. The device incorporates all ...
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The output enable (EN) input allows the regulator output to be disabled by an external logic con- trol signal. Output Voltage Setting ...
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EL7551C - Preliminary Monolithic 1 Amp DC:DC Step-down Regulator Start-up Delay A capacitor can be added to the EN pin to delay the con- verter start-up (Figure 2) by utilizing the pull-up current. The delay time is approximately ...
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EL7551C - Preliminary Monolithic 1 Amp DC:DC Step-down Regulator General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the cir- cuitry or specifications ...