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Nisshinbo R1272S Synchronous Step-down DC / DC Controllers

Nisshinbo R1272S Synchronous Step-down DC / DC Controllers is a step-down DC/DC controller that can generate an output voltage of 0.7V to 5.3V by driving external high-/low-side NMOSs. By adopting a unique current mode PWM architecture without an external current sense resistor, the R1272S can make up a stable DC/DC converter with high efficiency even if adding low Ron MOSFETs and a low DCR inductor externally. And, by the frequency characteristics optimization using an external phase compensation capacitor, Nisshinbo R1272S can achieve a high-speed response to variations of input voltage and load current.

Features

  • 4.0V to 34V (36V) maximum operating voltage
  • -40°C ≤ Ta ≤ +105°C operating temperature range (usable in high-temperature environments)
  • 4.5V start-up voltage
  • 0.7V to 5.3V output voltage
  • 0.64V ± 1% feedback voltage tolerance
  • 15µA typical consumption current at No Load (at VFM mode)
  • 250kHz to 1MHz adjustable oscillation frequency
  • 250kHz to 1MHz synchronizable clock frequency
  • ±3.6% typical spreading rate for SSCG
  • 100ns typical minimum on-time
  • 120ns (at regulation mode) typical minimum off-time at dropout, the actual minimum off-time is reduced
  • Typ. 500µs adjustable soft-start time
  • Pre-bias start-up
  • Anti-phase clock output
  • Tj = +160°C (typical) thermal shutdown function
  • 3.3V (typical) under-voltage lockout (UVLO) function
  • FB pin voltage (VFB) + 10% (typical) over-voltage detection (OVD) function
  • FB pin voltage (VFB) x 3% (typical) detection/release hysteresis
  • FB pin voltage (VFB) - 10% (typical) under-voltage detection (UVD) function
  • FB pin voltage (VFB) x 3% (typical) detection/release hysteresis
  • Hiccup-mode/latch mode over-current protection
  • 50mV/70mV/100mV selectable current limit threshold
  • NMOS Open-Drain Output Power Good Output
  • HSOP-18 package

Applications

  • Digital home appliances
    • Digital TV
    • DVD players
  • Office equipment
    • Printers
    • Fax machines
  • Mobile communication equipment, cameras, and video instruments
  • High-voltage battery-powered equipment

Related Eval Boards

Nisshinbo R1272S032A033-0500EV Evaluation Board

Used to evaluate the R1272S step-down DC/DC controller.

Learn Moreacerca de Nisshinbo R1272S032A033-0500EV Evaluation Board View Productsrelacionado con Nisshinbo R1272S032A033-0500EV Evaluation Board

Nisshinbo R1272S032A050-0500EV Evaluation Board

Used to evaluate the R1272S step-down DC/DC controller.

Learn Moreacerca de Nisshinbo R1272S032A050-0500EV Evaluation Board View Productsrelacionado con Nisshinbo R1272S032A050-0500EV Evaluation Board
Publicado: 2020-10-28 | Actualizado: 2024-05-03