LingLiEr, introduce a high power, the I2C control, high efficiency power pathways (PowerPathTM) manager, ideal diode controller and lithium ion battery charger LTC4155, this device used in tablet PC, such as the mobile PC (personal video player UMPC), and smart phones, digital camera, PDA, portable medical and industrial equipment, as well as the personal navigation device single battery portable devices. The IC design used in DuoZhong power efficient transport from as high as 15 W power, and maximize reduce power consumption and relax hot budget constraints. LTC4155 switch PowerPath topology seamless management such as communication adapter and USB port two such power supply input to the device can be recharged lithium ion battery power distribution, and at the same time in the input power Co., LTD, give priority to load power supply system.
Because LTC4155 save power, so the devices allow the output to load current input power more than the current draw, which can maximize the power available to recharge the battery, and no more than the input power supply the requirement of the specifications. When, for example, from A 5 V / 2 A communication power supply, the adapter of IC switching voltage regulators efficient can be more than 90% of the 10 W power transmitted is realized, and as high as 2.4 of A charging electric current, and realized the faster speed of charging. And ordinary switch battery chargers, the characteristics of different LTC4155 is instant through to work to ensure that even if the battery has already depth discharge, a plug in power plug a power system. This device support USB On-The-Go (USB OTG), so no extra components, can in turn to The USB port provides 5 V power supply.

A simple two line the I2C port allows in the circuit board a lot of system control parameters adjustment, including charging electric current, the input current (including USB 2.0 and 3.0 compatible Settings) and float offset voltage. The communications bus also allows LTC4155 offer, such as temperature, the input power battery, charger, and state state fault state state information, etc.

The independent LTC4155 all single quarter function lithium ion/polymer battery chargers can provide up to 3.5 A charge current, and four kinds of floating offset voltage setting and 15 kinds of charging current Settings. In order to improve safety margin, an integrated batteries overheating circuit can selectively reduce inspection, in case the battery voltage high temperature and high battery voltage battery appears at the same time. In addition, the charger can automatically recharge, bad battery detection, Juan flow charging, programmable safety timer, thermistors temperature qualified charging, can be programmed instruction/termination, charging end and programmable interrupt occurs, and other functions.

LTC4155 double output, priority multiplexing over-voltage protection (OVP) circuit can avoid accidents caused by high voltage on any damage. The ideal diode controller can ensure that always can provide enough power to the VOUT, even in the input power shortage or missing case is no exception. To minimize when devices connected to a stop to the USB port of battery consumption, by a layout in VBUS and VOUT LDO between to allow USB power supply to suspend applied circuit to deliver current. In order to eliminate from manufacturing to sales in the process of the battery consumption, a "shipping and storage" features for will have very low battery standby current reduced to close to zero.

Summary: LTC4155 performance

3.5 A, can provide the high power, high efficiency charging electric current lithium ion battery charger switch

· monolithic switching voltage regulators can best use of limited usable power input

For DuoGe input, and with priority multiplexing function of double channel, over-voltage protection controller

· input over-voltage protection

· the I2C/SMBus control to achieve the best performance of the system and provide status information

In the low battery power, when instant through work

· battery ideal diode controller realize power management

From the battery, the USB port to the USB OTG power supply

The inspection, the battery overheat

With 4 kinds of float, set the offset voltage full functional lithium ion/polymer charger

From ac adapter, provide maximum charge current 3.5 A

· support USB 2.0 and USB 3.0 specification

Flat (0.75 mm), and 4 mm x 5 mm lead QFN encapsulation