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Plan ecológico

Notas de Diseño

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  Tiny Buck Regulator Accepts Inputs from 3.6V to 25V and Eliminates Heat Sink &mdash DN268
  PDF, 95 Kb, Archivo publicado: sept 3, 2001
  Extracto del documento

  advertisement Tiny Buck Regulator Accepts Inputs from 3.6V to 25V
  and Eliminates Heat Sink – Design Note 268
  Jeff Witt An external resistor divider programs the output voltage to any value above the part’s 1.25V reference. The
  shutdown mode reduces the supply current to 1ОјA and
  disconnects the load from the input supply.
  An internal 3.4V undervoltage lockout prevents switching at low input supply. The LT1616 will also withstand
  a shorted output. A fast current limit protects the circuit
  in overload and limits output power; when the output
  voltage is pulled to ground by a hard short, the LT1616
  reduces its operating frequency to limit dissipation and
  peak switch current. 5 VIN D2 1 BOOST C3
  L1
  0.01ОјF 10ОјH LT1616
  OFF ON 4 SHDN
  GND
  2 6 SW
  FB R1
  16.5k 3 C1
  1ОјF VOUT
  3.3V
  300mA: VIN = 4.5V TO 25V
  400mA: VIN = 4.7V TO 25V D1 C2
  10ОјF R2 …

Artículos

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  Tiny SOT-23 Buck Regulator Accepts Inputs from 3.6V to 25V &mdash LT Journal
  PDF, 363 Kb, Archivo publicado: sept 1, 2000
  Extracto del documento

  DESIGN FEATURES Tiny SOT-23 Buck Regulator Accepts
  Inputs from 3.6V to 25V
  by Jeff Witt Complete Switcher in SOT-23
  Results in Compact Solution
  Several features of the LT1616 enable
  this combination of small size and
  large voltage range. The high (1.4MHz)
  switching frequency allows the use of
  small inductors and capacitors. The
  current mode control circuit with its
  internal loop compensation eliminates
  additional components and handles
  a wide variety of output capacitors,
  including ceramic capacitors. The
  internal NPN power switch drops just
  200mV at 300mA. In order to fully
  saturate this switch, the LT1616 generates its own bias supply above the input voltage using an external diode
  and capacitor tied to its BOOST pin.
  An external resistor divider programs the output voltage to any value
  above the part’s 1.25V reference. The
  operating current is 2mA. The shutdown mode reduces the supply
  current to 1ВµA and disconnects the
  load from the input supply. …

Linea modelo

Clasificación del fabricante

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Internal Power Switch Buck

Otros nombres:

LT1616ES6PBF, LT1616ES6 PBF