Switch Mode USB PMIC maximizes battery runtime.
Share:
Press Release Summary:
Supplied in 4 x 6 x 0.75 mm QFN package, LTC3586 integrates switching PowerPath(TM) manager, stand-alone battery charger, always-on LDO, and 4 synchronous switching regulators: 1 buck-boost, 1 boost, and 2 buck. PowerPath control manages power flow between input sources and Lithium battery while preferentially providing power to system load. Switching input stage offers up to 700 mA from 500 mA limited USB supply or up to 1.5 A when wall-powered. Efficiencies reach up to 94%.
Original Press Release:
Switch Mode USB Power Manager, Buck-Boost, Boost & Dual Buck Regulator PMIC Maximizes Battery Runtime in Compact 24mm² Footprint
MILPITAS, CA - September 2, 2008 - Linear Technology Corporation announces the LTC3586, the latest and most highly integrated PMIC in a family of multi-function, compact power management solutions for Li-Ion/Polymer battery applications. The LTC3586 integrates a switching PowerPath(TM) manager, a stand-alone battery charger, always-on LDO, and 4 high efficiency synchronous switching regulators: 1 buck-boost, 1 boost, and 2 buck regulators, all in a compact, low-profile 4mm x 6mm QFN package. The LTC3586's PowerPath control 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 system load power even with a dead battery. For fast charging, the LTC3586'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 or up to 1.5A when wall powered. An internal 180milliohm ideal diode plus optional external ideal diode controller provide a low loss power path, further minimizing heat generation and maximizing efficiency.
The LTC3586's buck-boost regulator can deliver up to 1A continuously and is ideal for efficiently regulating a 3.3V output over the full Lithium battery voltage range, down to 2.75V. The LTC3586's two buck regulators feature 100% duty cycle operation and are capable of delivering output currents of 400mA each, with adjustable output voltages down to 0.8V. The boost regulator is capable of at least 800mA output current and is programmable up to a 5V output. The LTC3586's internal low RDS(ON) switches enable switching buck and buck-boost efficiencies as high as 94%, maximizing battery run time. In addition, Burst Mode® operation optimizes efficiency at light loads with a quiescent current of only 25uA for the buck-boost regulator and only 35uA for each buck regulator (<1uA each in shutdown for all). The high 2.25MHz switching frequency allows the use of tiny low cost capacitors and inductors less than 1mm in height. Furthermore, all regulators are stable with ceramic output capacitors, achieving very low output voltage ripple.
The LTC3586 features USB-compatible programmable input current limiting to 100mA/500mA/1A, while its Bat-Track(TM) adaptive output control enables high efficiency battery charging with minimum power dissipation. To preserve battery energy, the LTC3586 draws only 44uA in suspend mode. The charger is compatible with inputs up to 5.5V (7V absolute maximum transient for added robustness).
The LTC3586 is available from stock in a compact, low-profile (0.75mm) 4mm x 6mm QFN-38 package. Pricing starts at $5.30 each for 1,000-piece quantities.
Summary of Features: LTC3586
Complete Multi-Function PMIC: Switching Power Manager, Li-Ion/Polymer Battery Charger, Buck-Boost Regulator, Dual Buck Regulators, Boost Regulator & LDO
Thermally Enhanced, Low Profile (0.75mm) 38-Lead 4mm x 6mm QFN Package
Power Manager & Battery Charger
High Efficiency Switching PowerPath Controller with Bat-Track Adaptive Output Control
Maximum Charge Current Programmable up to 1.5A from Wall Adapter
Up to 700mA Charge Current from a Standard USB Port
DC/DC Converters
High Efficiency Buck-Boost Regulator: 1A IOUT
High Efficiency Boost Regulator: 800mA IOUT
Two High Efficiency 2.25MHz Synchronous Buck Regulators: 400mA/400mA IOUT
2.25MHz Operating Frequency Enables Small External Components
Burst Mode Operation for Low IQ: 25uA for Buck-Boost, 35uA per Buck Regulator
Always-On 3.3V/25mA LDO
Multi-Function PMIC: Switching Power Manager + Battery Charger + Buck-Boost + Boost + Dual Sync Buck + 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 uModule, PowerPath and Bat-Track are trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.
