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Notas de Diseño

• Descargar
  1.4MHz Switching Regulator Draws Only 10ВµA Supply Current &mdash DN256
  PDF, 92 Kb, Archivo publicado: mayo 1, 2001
  Extracto del documento

  advertisement 1.4MHz Switching Regulator Draws Only 10ВµA Supply Current
  Design Note 256
  Jaime Tseng
  Introduction
  High switching frequency and low quiescent current
  are no longer conflicting requirements in the design
  of battery-powered products. Linear Technology’s
  LTC ®3404 is the industry’s first step-down switching
  regulator that operates at 1.4MHz while drawing only
  10ОјA of supply current (using Burst ModeВ® operation)
  at no load. This impressive feat allows for better than
  90% efficiency over three decades of output load current
  while allowing the use of tiny external components. With
  the on-chip main and synchronous switches, minimal
  external components are necessary to make a complete,
  high efficiency (up to 95%) step-down regulator. Tiny
  external components and the LTC3404’s MSOP package
  provide a minimum-area solution to meet the limited
  space requirements of today’s portable applications. driving SYNC/MODE pin HIGH with a logic-level signal
  or by tying it to VIN. For lower noise, pulse skipping
  mode can be selected by driving the SYNC/MODE pin
  LOW with a logic-level signal or by tying it to ground. In
  this case, constant-frequency operation is maintained …

Artículos

• Descargar
  1.4MHz Switching Regulator Draws Only 10µA Supply Current &mdash LT Journal
  PDF, 160 Kb, Archivo publicado: nov 1, 2000
  Extracto del documento

  DESIGN IDEAS 1.4MHz Switching Regulator Draws
  Only 10ВµA Supply Current
  by Jaime Tseng LTC3404
  47pF 1
  2
  3
  4 RUN PLL LPF ITH SYNC/MODE VFB VIN GND SW 8 10µF†
  CER Burst Mode operation can be selected
  by driving SYNC/MODE pin HIGH
  with a logic-level signal or by tying it
  to VIN. For lower noise, pulse skipping
  mode can be selected by driving the
  SYNC/MODE pin LOW with a logic
  level signal or by tying it to ground. In
  this case, constant-frequency operation is maintained at lower load
  currents together with lower output
  ripple. If the load current is low
  enough, cycle skipping will eventually occur to maintain regulation. In
  this mode, the efficiency will be lower
  at very light loads, but becomes
  comparable to Burst Mode operation
  when the output load exceeds 50mA.
  For switching-frequency-sensitive …

Linea modelo

Clasificación del fabricante

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Micropower Buck Regulators | Internal Power Switch Buck
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators

Otros nombres:

LTC3404IMS8PBF, LTC3404IMS8 PBF