LTC3600 Step-Down Regulator

By Analog Devices Inc 211

LTC3600 Step-Down Regulator

The LTC3600 from Linear Technology is a high efficiency, monolithic synchronous buck regulator whose output is programmed with just one external resistor. The accurate internally generated 50 µA current source on the ISET pin allows the use of a single external resistor to program an output voltage that ranges from 0 V to 0.5 V below VIN. The VOUT voltage feeds directly back to the error amplifier in unity gain fashion and equals the ISET voltage. The operating supply voltage range is 4 V to 15 V, making it suitable for dual lithium-ion battery and 5 V or 12 V input point-of-load power supply applications.

The operating frequency is synchronizable to an external clock or programmable from 200 kHz to 4 MHz with an external resistor. High switching frequency allows the use of small surface mount inductors. The unique constant on-time architecture is ideal for operating at high frequency in high step-down ratio applications that also demand fast load transient response.

  • Single resistor programmable VOUT
  • ±1% ISET accuracy
  • Tight VOUT regulation independent of VOUT voltage
  • Easy to parallel for higher current and heat spreading
  • Wide VOUT range 0 V to VIN - 0.5 V
  • High efficiency: up to 96%
  • <1 µA supply current in shutdown
  • 1.5 A output current
  • Adjustable frequency: 200 kHz to 4 MHz
  • 4 V to 15 V VIN range
  • Current mode operation for excellent line and load transient response
  • Available in thermally enhanced 12-pin (3 mm x 3 mm) DFN and MSOP packages
  • Point-of-load power supplies
  • Portable instruments
  • Battery-powered equipment
  • Voltage tracking supplies
  • Distributed power systems

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