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EL7551 - Monolithic 1Amp DC:DC Step-down Regulator

Description

CONDITIONS MIN TYP VREF VREFTC VREFLOAD VRAMP IOSC_CHG IOSC_DIS IVDD+VDRV IVDD_OFF VDD_OFF VDD_ON TOT THYS ILEAK ILMAX RDSON RDSONTC VFB VFB_LINE VFB_LOAD VFB_TC IFB VEN_HI VEN_LO IEN Reference Accuracy Reference Temperature Coefficient Reference Load Regulation Oscillator Ramp Amplitude Oscilla

Features

  • Integrated synchronous MOSFETs and current mode controller.
  • 1A continuous output current.
  • Up to 95% efficiency.
  • 4.5V to 5.5V input voltage.
  • Adjustable output from 1V to 3.8V.
  • Cycle-by-cycle current limit.
  • Precision reference.
  • ±0.5% load and line regulation.
  • Adjustable switching frequency to 1.2MHz.
  • Oscillator synchronization possible.
  • Internal soft start.
  • Over temperature protection.

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Full PDF Text Transcription

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NOT RECOMMENDED FOR NEW DESIGNS SEE EL7531 OR EL7536 EL7551 Monolithic 1Amp DC:DC Step-down Regulator DATASHEET FN7291 Rev 1.00 March 21, 2006 The EL7551 is an integrated, synchronous step-down regulator with output voltage adjustable from 1.0V to 3.8V. It is capable of delivering 1A continuous current at up to 95% efficiency. The EL7551 operates at a constant frequency pulse width modulation (PWM) mode, making external synchronization possible. Patented on-chip resistorless current sensing enables current mode control, which provides cycle-by-cycle current limiting, over-current protection, and excellent step load response. The EL7551 is available in a fused-lead 16-pin QSOP package. With proper external components, the whole converter fits into a less than 0.4 in2 area.
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