DC to DC Power Supplies (Converters)
DC/DC Converter includes output disconnect.
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Press Release Summary:
Featuring inrush current limiting, synchronous step-up Model LTC3458 offers input voltage of 1.5-6 V, enabling it to operate from dual-cell alkaline/NiMH/NiCd battery, single-cell Li-Ion, or USB power. It can deliver up to 7.5 V with efficiencies up to 93%. Switching frequency is programmable up to 1.5 MHz, keeping switching noise out of noise-sensitive circuitry. Housed in 4 x 3 mm DFN package, converter provides 1.4 A of boost capability.
Original Press Release:
1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
Milpitas, CA - February 22, 2005 - Linear Technology Corporation announces the LTC3458, a 1.4Amp, 7.5V, 1.5MHz synchronous step-up DC/DC converter with inrush current limiting and output disconnect. Its wide 1.5V to 6V input voltage range enables the LTC3458 to operate from a dual-cell alkaline/NiMH/NiCd battery, a single-cell Li-Ion, or USB power. It can deliver outputs up to 7.5V with efficiencies up to 93%. Its switching frequency is programmable up to1.5MHz, allowing designers to keep switching noise out of noise-sensitive circuitry and enabling the use of tiny capacitors and inductors. The combination of the LTC3458's high efficiency switch and tiny 4mm x 3mm DFN package provides 1.4A of high efficiency boost capability in a very compact form factor.
For light load efficiency, the LTC3458 utilizes programmable Burst Mode® operation to reduce quiescent current to less than 15uA. The current threshold at which the Burst Mode operation begins is user-programmable, enabling designers to optimize battery run-time. Switching frequency is also programmable from 400kHz to 1.5MHz via a single resistor. Other features include current mode operation, programmable soft-start and a programmable current limit.
The LTC3458EDE is available from stock in a low profile (0.75mm) 4mm x 3mm DFN package. Pricing starts at $3.30 each for 1,000-piece quantities.
Summary of Features: LTC3458
Programmable Output Voltages up to 7.5V
1.5V to 6V Input Range
High Efficiency: Up to 93%
Inrush Current Limiting and Output Disconnect
Programmable/Synchronizable Fixed Frequency Operation up to 1.5MHz
Programmable Automatic Burst Mode® Operation
Current Mode Control with Programmable Soft-Start and Peak Current Limit
700mA at 7V from 5V Input
0.30 Ohm N-Channel and 0.4 Ohm P-Channel 1.4A Switches
Ultralow Quiescent Currents: 15uA Sleep, <1uA in Shutdown
3mm x 4mm DFN-12 Package
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. 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, 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.
North America
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
