USB Power Manager – LTC4085
LTC4085 is a portable USB power manager self monolithic ideal diode controller and standalone linear battery charger. LTC4085 PowerPath control with, or the USB VBUS power adapter AC to power the system load, and single-cell lithium ion / polymer battery charger. To comply with USB specifications to the limit, LTC4085 automatically when the system load current increases, thus reducing the battery charge current. To ensure that the battery is fully charged when the bus connection is not used as such, the IC by the USB bus to power the load Shusong, but have no power to the battery practice. Once the power is off, the current through a 200mΩ ideal diode low loss rate of the battery to the load, thus reducing the voltage drop and power dissipation. Provided advice to drive an optional external PFET GATE circuit for connecting peripherals to the case in the application necessary for the overall ideal diode impedance below 30mΩ the following. LTN141W3 LTN141X7 LTN141X8
LTC4085 unique feature is the AC adapter can detect the access and use it as a kind of power system load while charging the battery backup power. LTC4085 also provides access to an AC adapter in the case of higher values to USB specifications allow (100/500mA) rating (up to 1.5 A) to charge the battery option, so they can dramatically increased rates of charges the battery. The total cost of time late charge by an external resistor to set. When the load current decreases, the load timer period will be automatically extended to ensure that the battery is always fully charged state. Additional features include automatic recharge, NTC thermistor input, input adapter is automatically removed the battery, limiting the inrush current, reverse current blocking, lock-out under-voltage and thermal setting.
LTC4085 float voltage is preset at 4.2V from 0 to 85 ℃ temperature to ensure the accuracy of 0.8%. Charging current can be easily adjusted using a resistor. The optimum temperature for charging the battery of pre-treatment and certification will automatically be set to 10% of the total flow of the trickle charge current battery until the battery voltage exceeds 2.8V up at. LTN141XA LTN141XB LTN141XC
For, like GPS navigation devices, PDAs, digital cameras, digital photo player, MP3/MP4 players and other handheld devices, offering the USB port and the input voltage, high load capacity and battery has many advantages such as energy USB if you have not driven on the road to bring the convenience of the charger, a laptop from a PC or other device with USB port to power your device. Such as FireWire, 12 ~ 24V AC adapter or car adapter, car power can input-output high voltage to provide a higher speed of USB charging, and allow more places (like cars), taxation , which is to improve facilities One of the keys to portability.
Convenience features and high power
LTC408 And LTC408 -5 Is a portable USB power manager self, ideal diode controller and standalone high-voltage battery charger for high efficiency. To achieve efficient load their switching topology can be adapted to a variety of appetizers, including up to 36V (40V max) of high voltage (like 12V AC adapter, car adapter and a FireWire port). In addition, they also accepted such as adapters and USB 5V supply low voltage. LTC408? -5 With PowerPath control feature, available on the USB or power adapter to the equipment and materials of the lithium-ion battery charging, but also the introduction of a severe shortage of battery power is exhausted or the situation to achieve “instant-on” operation. LTN154X1 LTN154X2 LTN154X3
To comply with USB specifications to the limit, LTC408? -5 Load current increases in the system automatically reduces battery charge current when. To ensure that a fully charged battery is connected to a full charge state when the bus termination, the IC by the USB bus to transport power to the load, but did not take lessons from battery approach. Once all food was removed, then the current through a 200mΩ ideal diode low loss rate of the battery to the load, thus reducing the voltage drop and power dissipation. Provided to drive an optional external PFET circuit board to the case in the application necessary for the overall ideal diode impedance below 30mΩ the following, which will enhance the work efficiency.
When LTC408? -5 Power from USB port to provide power management system allows the maximum available power, which increased by 2.5 W (500 mA x 5V) from the USB power solution available. In addition, it would, the system automatically adjust the load current lithium-ion / polymer battery charge current to maintain the total input current limit consistent with the USB. LTN154X7 LTN154XA LTN156AT01
LTC408 Switching regulator with output track the BAT-based adaptive control, which greatly improved its offer 1.2A charge current from the battery charger efficiency, because the output voltage of the switching regulator automatically tracks the voltage of the battery. LTC408 -5 from the input voltage high is a fixed 5V output, used in single-cell lithium-ion / polymer battery charger. The float voltage battery charger is preset to 4.2V, at intervals of 0 ~ 85 ℃ temperature to ensure the accuracy of 1.0%. Charging current can be easily adjusted through a resistor. The total cost of time late charge set by an external capacitor, and provides an output charge detection C/10 current. Additional features include automatic adjustment for temperature qualified charging heat to the NTC thermistor input, the battery will automatically recharge, reverse blocking and lock-out being energized. LTC408 -5 With flat (height of only 0.75 mm) 6mm 22-pin 3mm × tiny DFN package, and the guarantee of -40 ~ 85 ℃ operating temperature. dell gw240 dell rn873 dell y6142
BAT-track control output adjustment
LTC408 AT-Track function adaptive output control is a form. This is a battery charger and switching regulator integrated, so that the switching regulator does not produce enough to sustain the required voltage of the battery charger, but does not produce additional tension. Linearly supply for the product, the input voltage and voltage difference of the battery in the charging process is lost as waste heat.
Where implementation of a switching regulator, the switch to both ends of the pressure drop as large as possible is beneficial because it can effectively accomplish the (absorbed by the input current is less than the current supplied to the charger). dell gk479 dell nf343 dell pc764
BAT-Track function is responsible for detecting the voltage of BAT, and switching regulator output VOUT to adjust to the battery voltage VBAT exceeds 300mV, minimizing power loss caused by heat, can charge the battery properly and maximize reduce total electricity consumption. This greatly improves the efficiency of the battery charger. For example: When the load current IBAT = 600mA, VBAT = 3.7 V input voltage VIN = 5V charger, the charger efficiency (with the substitution method element) is as follows: 100 × POUT / (POUT + PDIS) = 100 × (× VBAT IBAT) / (× VBAT IBAT PDIS +) = 100 × (× VBAT IBAT) / (VIN x IIN) = (3.7 × 600mA) / (5V × 600mA) = 74%.
Conversely, if the charger voltage VBAT input exceeds 300mV the charger efficiency: 100 × (× VBAT IBAT) / (VIN x IIN) = (3.7 × 600mA) / ((3.7 V 0.3 V) × 600 mA) = 92.5%.
This difference in efficiency will significantly reduce energy consumption. In addition, if the battery against discharge and voltage VBAT to low, the minimum should be 3.6V VOUT, to ensure that the system load for a sufficient supply voltage. dell hd438 dell y9943 dell fk890