Switch-mode USB Power Manager maximizes battery run time.March 25, 2008 -
Multi-function power management solution, Series LTC3566, integrates switching PowerPath(TM) manager, stand-alone battery charger, 1A synchronous buck-boost regulator, ideal diode, and LDO. PowerPath(TM) control manages power flow between wall adapter, USB port, and lithium battery while preferentially providing power to system load. Switching input stage converts 2.5 W from USB port to 700 mA charging current. Regulator is available in low-profile 4 x 4 mm QFN package.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
Linear Technology Corp.
1630 McCarthy Blvd.
Milpitas, CA, 95035
USA
Switch Mode USB Power Manager(TM) with Integrated 1A Buck-Boost Maximizes Battery Run Time & Minimizes Heat
MILPITAS, CA - February 25, 2008 - Linear Technology Corporation announces the LTC3566, the latest in a family of compact next-generation, multi-function power management solutions for Li-Ion/Polymer battery applications. The LTC3566 integrates a switching PowerPath(TM) manager, a stand-alone battery charger, a 1A high efficiency synchronous buck-boost regulator, an ideal diode and controller, plus an always-on LDO, all in a compact, low-profile 4mm x 4mm QFN package.
The LTC3566's PowerPath control feature seamlessly manages power flow between multiple input sources such as a wall adapter or USB port and the Lithium battery while preferentially providing power to the system load.
In addition, its "instant-ON" operation ensures power to the system load even with a dead battery. For fast charging, the LTC3566's switching input stage converts nearly all of the 2.5W available from the USB port to charging current, enabling up to 700mA from a 500mA limited USB supply and up to 1.5A when wall powered. An internal 180milliohm ideal diode plus optional external ideal diode controller provide a low loss power path from the battery to the system load, further minimizing heat generation and maximizing efficiency.
The LTC3566's onboard synchronous buck-boost regulator can deliver up to 1A continuously and is ideal for efficiently regulating a 3.3V output voltage over the full Lithium battery voltage range, down to 2.75V input. The regulator's internal low RDS(ON) switches enable efficiency as high as 94%, maximizing battery run time. In addition, Burst ModeŽ operation optimizes efficiency at light loads with a quiescent current of only 20uA ( < 1uA in shutdown).
The high 2.25MHz switching frequency allows the use of tiny low cost capacitors and inductors less than 1mm in height. Furthermore, the regulators are stable with ceramic output capacitors, achieving very low output voltage ripple.
The LTC3566 features USB-compatible programmable current limiting to 100mA/500mA/1A, while its Bat-Track(TM) adaptive output control enables high efficiency battery charging and reduces power dissipation. Stand-alone autonomous operation simplifies design, eliminating the need for an external microprocessor for battery charge termination. To preserve battery energy, the LTC3566 draws only 38uA in suspend mode. The charger is compatible with inputs up to 5.5V (7V absolute maximum transient for added robustness).
The LTC3566 is available from stock in a compact, low-profile (0.75mm) 4mm x 4mm QFN-24 package. Pricing starts at $3.85 each for 1,000-piece quantities.
Summary of Features: LTC3566
oComplete Multi-Function PMIC: Switching Power
oManager, Li-Ion/Polymer Battery Charger
o1A Buck-Boost Regulator & LDO
oThermally Enhanced, Low Profile (0.75mm)
o24-Lead 4mm x 4mm QFN Package
oPower Manager & Battery Charger
oHigh Efficiency Switching PowerPath Controller with Bat-Track Adaptive Output Control
oMaximum Charge Current Programmable up to 1.5A from Wall Adapter
oUp to 700mA Charge Current from USB Port
oDC/DC Converters
oHigh Efficiency Buck-Boost Regulator: 1A IOUT
oBuck-Boost Regulator Adjustable Output
oVoltage Range: 2.75V to 5.5V
oBurst Mode Operation for Low IQ: 20uA for Buck-Boost Regulator
oAlways-On 3.3V/25mA LDO
oMulti-Function PMIC: Switching Power Manager + Battery Charger + 1A Buck-Boost + LDO
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 PowerPath and Bat-Track are trademarks of Linear Technology Corp.
Worldwide 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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