15-W I2C power manager charges Li-Ion cells at 3.5-A for tablets, UMPCs and portable power systems
June 16, 2011 // Paul Buckley
Linear Technology Corporation has introduced a high power, I2C controlled, high efficiency PowerPath manager, ideal diode controller and lithium-ion battery charger for single-cell portable devices such as tablet PCs, ultra-mobile PCs (UMPCs), personal video players, smart phones, digital cameras, PDAs, portable medical and industrial devices and personal navigation devices.
Because power is conserved, the LTC4155 allows the output load current to exceed the current drawn by the input supply, maximizing use of the available power for battery charging without exceeding the input supply power delivery specifications. For example, when powered from a 5 V/2 A wall adapter, the ICs switching regulator efficiently transfers over 90% of the available 10 W, enabling up to 2.4 A charge current and resulting in faster charge times. Unlike ordinary switching battery chargers, the LTC4155 features instant-on operation to ensure that system power is available at plug-in even with a deeply discharged battery. USB On-The-Go support provides a 5 V supply back to the USB port without any additional components.
A simple 2-wire I2C port provides broad adjustability for many system control parameters including charge current, input current (including USB 2.0 and 3.0 compatible settings) and float voltage. The communications bus also allows the LTC4155 to provide status information such as battery temperature, input supply status, charger status and fault status.
The LTC4155s autonomous full-featured single-cell Li-Ion/Polymer battery charger is capable of up to 3.5 A charge current and features four float voltage settings and fifteen charge current settings. For improved safety margin, an integrated overtemperature battery conditioning circuit can optionally reduce the battery voltage in case both high battery temperature and high battery voltage occur simultaneously. The charger includes automatic recharge, bad cell detection, trickle charge, programmable safety timer, thermistor temperature qualified charging, programmable end-of-charge indication/termination and programmable interrupt generation.All news
Display Stream Compression standard boosts display interfaces to 8K
April 23, 2014
The Video Electronics Standards Association (VESA), working in liaison with the MIPI Alliance, has unveiled the Display Stream ...
Hard wired floating point changes FPGA
Printoo: printed electronics made Arduino-compatible
Magnetic RAM set for 50% CAGR, says report
Anritsu adds GCF approved test cases to lead global roll-out of LTE-Advanced
LED bulbs - what is a whiter shade of pale?
April 22, 2014
Scientists from Penn State in partnership with Soraa Inc., believe that some LED bulbs whites are not 'whiter than white' ...
Mouser and ADI sponsor 12th annual NASA Tech Briefs design contest
Should the solar cell be pensioned off?
Nike FuelBand layoffs: a pivot in wearables?
- USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation
- Measurement applications across multiple test platforms
- Supplying DC input power to string inverters
- Supplying DC input power for HEV testing
InterviewHeartbleed challenges the Internet of Thing
The Heartbleed security bug is a key example of the fundamental security challenge for the Internet of Things says Green Hills Software as it launches a new security group.
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Arrow Electronics is giving away ten XMC1200 lighting application kits, worth 100 Euros each, for EETimes Europe's readers to win.
Each kit combines Infineon’s brightness and colour control XMC1200 CPU board to drive flicker free LED dimming and colour changing, together with a colour LED card and a white LED card.
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.