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8A, 18V Synchronous Step-Down Regulator Delivers 8A from 7mm x 8mm QFN

MILPITAS, CA - August 5, 2008 - The LTC3608 is a high efficiency, synchronous buck regulator that can deliver up to 8A of continuous output current at voltages as low as 0.6V. It operates from an input voltage range of 4V to 18V (20V ABS Max), making it ideal for applications with multicell Li-Ion, lead acid batteries or fixed voltage rails up to 15V. Its valley current control architecture delivers very low duty cycle operation at high frequencies with excellent transient response.

The LTC3608 uses internal switches with an RDS(ON) of only 10mOhms and 8mOhms 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 900uA of quiescent current. Shut down quiescent current is only 15uA.

The LTC3608EWKG is available from stock in a 52-lead, 7mm x 8mm QFN package. Pricing starts at $7.50 in 1,000-piece quantities. An industrial grade version, the LTC3608IWKG is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is priced at $8.63 in 1,000-piece quantities. All versions are available from stock.                                                                                                            

8A Monolithic Synchronous Step-Down Regulator

Summary of Features: LTC3608 Output Current
Wide VIN Range = 4V to 18V
Internal N-Channel MOSFETs
True Current Mode Control
Optimized for High Step-Down Ratios
tON(MIN) ≤ 100nsec
Extremely Fast Transient Response
Stable with Ceramic COUT
±1% 0.6V Voltage Reference
Power Good Output Voltage Monitor
Adjustable On-Time/Switching Frequency
Adjustable Current Limit
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Low Shutdown IQ: 15uA
Available in a 7mm × 8mm 52-Pin QFN Package


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