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10V, 3MHz, Synchronous Step-Down Regulator Delivers 2.5A from a 4mm x 4mm QFN

(PresseBox) (Milpitas,CA, ) Linear Technology announces the LTC3602, a high efficiency, 3MHz synchronous buck regulator which uses a constant frequency, current mode architecture. It can deliver up to 2.5A of continuous output current at output voltages as low as 0.6V from a 4mm x 4mm QFN (or a thermally enhanced TSSOP-16) package. It operates from an input voltage of 4.5V to 10V, making it ideal for dual cell Li-Ion applications, as well as general purpose fixed rail systems. Its switching frequency is user programmable from 300kHz to 3 MHz, enabling the utilization of tiny low cost capacitors and inductors.

The LTC3602 uses internal switches with RDS(ON)s of only 65mOhm and 90mOhm to deliver efficiencies as high as 95%. It also utilizes low dropout 99% duty cycle operation to allow output voltages very close to VIN. No load quiescent current is only 75uA and less than 1uA in shutdown, making it ideal for applications that demand maximum battery run-time. For applications that require the lowest noise possible, the LTC3602 can be configured to run in forced continuous operation reducing noise and potential RF interference. Additional features include a Power Good voltage monitor, external synchronization capability, and thermal protection.

The LTC3602EUF is available in a 4mm x 4mm QFN-20, and the LTC3602EFE is offered in a 16-lead, thermally enhanced TSSOP package. Pricing starts at $4.00 and $4.10 each, respectively, in 1,000-piece quantities. Industrial grade versions, the LTC3602IUF and LTC3602IFE are tested and guaranteed to operate from a -40°C to 125°C operating junction temperature. All versions are available from stock.

Summary of Features: LTC3602

- Wide Input Voltage Range: 4.5V to 10V
- 2.5A Output Current
- Low RDS(ON) Internal Switches: 65mOhm and 90mOhm
- Programmable Frequency: 300kHz to 3MHz
- Low Quiescent Current: 75uA
- 0.6V ±1% Reference Allows Low Output Voltage
- 99% Maximum Duty Cycle
- Adjustable Burst Mode® Threshold
- Synchronizable to an External Clock
- Power Good Output Voltage Monitor
- Overtemperature Protection
- Available in 16-Lead Exposed TSSOP and 4mm × 4mm QFN-20 Packages


Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule(TM) products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. For more information, visit

LT, LTC, LTM, Burst Mode and are registered trademarks and uModule is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.