Analog Devices Inc

LTC3608 Synchronous Step-Down Regulator

8 A, 18 V synchronous step-down regulator from Analog Devices

Image of Analog Devices' LTC3608 Synchronous Step-Down RegulatorAnalog Devices' LTC3608 is a high efficiency, synchronous buck regulator that can deliver up to 8 A of continuous output current at voltages as low as 0.6 V. It operates from an input voltage range of 4 V to 18 V (20 V ABS max), making it ideal for applications with multicell Li-Ion, lead acid batteries or fixed voltage rails up to 15 V. Its valley current control architecture delivers very low duty cycle operation at high frequencies with excellent transient response. The operating frequency is set by an external resistor. Switching frequencies of up to 1 MHz allow the utilization of small, low cost ceramic capacitors and low profile inductors.

The LTC3608 uses internal switches with an RDS(ON) of only 10 mΩ and 8 mΩ to deliver efficiencies as high as 95%. The LTC3608 can be configured for discontinuous or forced continuous operation. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads requiring only 900 µA of quiescent current. Shut down quiescent current is only 15 µA. Additional features include a power good voltage monitor, adjustable current limit, output overvoltage protection and programmable soft-start.

Features
  • Wide VIN range = 4 V to 18 V
  • True current mode control
  • tON(MIN) ≤ 100 nsec
  • Stable with ceramic COUT
  • Power good output voltage monitor
  • Adjustable current limit
  • Output overvoltage protection
  • Low shutdown IQ: 15 µA
  • Internal N-channel MOSFETs
  • Optimized for high step-down ratios
  • Extremely gast transient response
  • ±1% 0.6 V voltage reference
  • Adjustable on-time / switching frequency
  • Programmable soft-start
  • Optional short-circuit shutdown timer
  • Available in a 7 mm × 8 mm 52-pin QFN package

 

LTC3608

ImageManufacturer Part NumberDescriptionTopologyOutput TypeAvailable QuantityPrice
IC REG BUCK ADJ 8A 52QFNLTC3608EWKG#PBFIC REG BUCK ADJ 8A 52QFNBuckAdjustable418 - Immediate$2,016.55View Details
Published: 2013-10-11

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