You are here

Switch Mode USB Power Manager with Integrated 1A Buck-Boost and I2C Interface Maximizes Battery Run Time & Minimizes Heat

Linear Technology Corporation announces the LTC3567, the latest in a family of compact next-generation, multi-function power management solutions for Li-Ion/Polymer battery applications.



. The LTC3567 integrates a switching PowerPath™ manager, a stand-alone battery charger, a 1A high efficiency synchronous buck-boost regulator, an ideal diode and controller, I2C control, plus an always-on LDO, all in a compact, low-profile 4mm x 4mm QFN package. 

The LTC3567’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 depleted battery. For fast charging, the LTC3567’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

The LTC3567’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 Mode® 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 LTC3567 features USB-compatible programmable current limiting to 100mA/500mA/1A, while its Bat-Track™ 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 LTC3567 draws only 38uA in suspend mode. The charger is compatible with inputs up to 5.5V (7V absolute maximum transient for added robustness).


Summary of Features: LTC3567
Complete Multi-Function PMIC: Switching Power Manager, Li-Ion/Polymer Battery Charger, 1A Buck-Boost
Regulator & LDO
I2C Control
Thermally Enhanced, Low Profile (0.75mm) 24-Lead 4mm x 4mm 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 USB Port
DC/DC Converters
High Efficiency Buck-Boost Regulator: 1A IOUT
Buck-Boost Regulator Adjustable Output Voltage Range: 2.75V to 5.5V
Burst Mode Operation for Low IQ: 20uA for Buck-Boost Regulator
Always-On 3.3V/25mA LDO


Hodnocení článku: