Triple-Output Converter has peak efficiency of 94%.June 23, 2008 -
Supplied in 3 x 3 mm QFN-16 package, LTC3100 integrates 700 mA synchronous boost regulator, 250 mA synchronous buck regulator, and 100 mA LDO. Boost converter operates from 0.65-5 V input and delivers 1.5-5.25 V output. Buck converter can run directly from boost converter output or independent 1.8-5.5 V input and delivers outputs down to 0.6 V. LDO input, tied to boost converter output, requires 130 mV of dropout voltage and offers additional low noise output adjustable down to 0.6V.
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Original Press release
Linear Technology Corp.
1630 McCarthy Blvd.
Milpitas, CA, 95035
USA
Synchronous 700mA (ISW) Boost & 250mA (IOUT) Buck Regulators & 100mA LDO in a 3mm x 3mm QFN
MILPITAS, CA - May 22, 2008 - Linear Technology Corporation announces the LTC3100, a triple output converter which includes a 700mA (ISW) synchronous boost regulator, a 250mA (IOUT) synchronous buck regulator and a 100mA (IOUT) LDO in a 3mm x 3mm QFN-16 package. Both the boost and the buck regulators switch at 1.5MHz and use current mode, synchronous topologies. The LTC3100's boost converter operates from an input voltage range of 0.65V (start-up) to 5V making it compatible with single or multiple cell alkaline/NiMH and single cell Li-Ion/Polymer batteries and can deliver output voltages from 1.5V to 5.25V. The 250mA buck converter can be run directly from the output of the boost converter or from an independent 1.8V to 5.5V input and can deliver outputs as low as 0.6V. The LDO's input is tied to the output of the boost converter and requires only 130mV of dropout voltage offering an additional low noise output adjustable down to 0.6V.
The combination of a boost, buck and LDO make the LTC3100 ideal for applications powered by low voltage inputs, such as single or dual cell alkaline batteries. For example: from a single cell alkaline input, the synchronous boost converter can deliver a higher voltage rail, such as 3.3V for microprocessor I/O, then the LDO will deliver a 3.0V output for memory and the synchronous step-down (connected to the output of the boost regulator) regulator can deliver a 1.0V VCORE rail. Synchronous rectification enables efficiencies of over 90% and Burst Mode® operation lowers quiescent current to only 15uA, providing extended battery run-time. Constant 1.5MHz frequency operation ensures low noise and high efficiency operation with tiny external inductors and capacitors.
The boost converter in the LTC3100 incorporates an integrated output disconnect function for reliable operation and also regulates when VIN>VOUT, extending usable battery run-time. Its output voltage is adjustable between 1.5V and 5.25V. Both switching converters offer internal compensation, soft start and have separate Power Good pins. All three channels have independent enable pins for power sequencing. For low noise applications, the Burst Mode feature can be replaced with a lower noise forced continuous mode via an external MODE pin. Offered in a 3mm x 3mm QFN-16 package, the LTC3100 offers a very compact solution footprint.
LTC3100EUD is available from stock in a 16-lead QFN package. 1,000-piece pricing starts at $3.10 each.
Summary of Features: LTC3100
Extremely Compact Triple-Rail Solution
Burst Mode® Operation, IQ=15uA
1.5MHz Fixed Frequency Operation
Power Good Indicators
700mA (ISW) Synchronous Step-Up DC/DC
0.65V to 5V VIN Range
1.5V to 5.25V VOUT Range
94% Peak Efficiency
VIN>VOUT Operation
Output Disconnect
250mA (IOUT) Synchronous Step-Down DC/DC
1.8V to 5.5V VIN Range
0.6V to 5.5V VOUT Range
LDO (VIN Internally Tied to VBST)
0.6V to 5.25V VOUT Range
200mV Dropout Voltage at 100mA
Available in a 16-Lead 3mm - 3mm QFN Package
700mA Synchronous Boost, 250mA Buck & 100mA LDO in 3mm x 3mm QFN Package
About Linear Technology
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 www.linear.com.
LT, LTC, LTM, and Burst Mode are registered trademarks and uModule is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.
Contacts
North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
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