LTC3577/-1/-3/-4: 4mm x 7mm PMIC integrates linear power supervisor and charger
Ling Li belong to special company (Linear Technology Corporation) Introduce the highly Integrated multi-functional power management integrated circuit (PMIC) Solve the scheme LTC3577, LTC3577-1, LTC3577-3 and LTC3577-4, these devices are used in the battery application of walkie lithium ion / polymer. Has LTC3577/-X integrated the compatible linear power thorough fare (PowerPath of one USB in flat flat 4mm x 7mm QFN has capsulated? ) Supervisor, an independent battery charger, overvoltage protection (OVP) , used for 10 LEDs driver, button put through / shut off control, 3 the intersection of high efficiency and stabilizator and two LDOs of stepping down etc. synchronously. LTC3577-1 and LTC3577-4 have the floating voltage of 4.1V batteries, in order to improve the extra high-temperature safety margin of concurrent implementation of the life-span of battery cycle, and LTC3577 and LTC3577-3 contain the floating voltage of the standard 4.2V battery, lengthens run time with the high limit. LTC3577-3 and LTC3577-4 are made-to-order for SiRF Atlas IV chip set. These IC is very suitable for the application of porable equipment, including individual navigates the apparatus (PND) , digital media / video broadcasting (DMB/DVB) Watch apparatus and walkie medical treatment and commercial installation in apparatus, figure / radio equipment of the satellite, media player, common report controller, photo.
The intersection of power and thorough fare of LTC3577/-X manage utensil, support the intersection of priority processing and function automatically, seamless manage, input conversion between power by a plurality of, in order to supply power to load, offer the high battery charging current up to 1.5A from the AC adapter power at the same time, or offer the high charging current up to 500mA from USB port. Charger and high to reach 5.5V (maximum transient value 7V absolutely, in order to strengthen the robustness) Input compatible. " put through immediately " of these IC The work can guarantee system load supplies power, even no exception when the battery totally discharges. Independent work simplification is designed, does not need the external microprocessor to realize and charge and stop. Overvoltage protection control device for exchanging /it is high for protections up to 30V since input and offer USB,and use for not lasting the safety and reliabilities of battery battery stepping down of voltage circuits high-temperature. For reset this device when the software is locked in the intersection of job and the intersection of season and energy capacity of battery of the province for a long time, LTC3577/-1 contains the hard reset function started through dash control, thus the ultralow static current condition of locating this IC, in this case the device is drawn
LTC3577/-1 can control the stepping down stabilizator under high pressure of a piece of outside, in order to realize the tracing of high-efficiency battery (Bat-Track through a high tension supply? ) Charge and power path control, thus reduce the power consumption. Limited for input current when or not offered ing, the internal 200mΩ ideal diode can offer one to get to the loaded low loss power thorough fare to add an available external ideal diode control device.
3 of LTC3577/-X are Integrated synchronously the stepping down stabilizator can offer the output current of mA of 800/500/500 respectively with 100% of the duty ratio work, and have the low adjustable output voltage to 0.8V. The high switching frequency of 2.25MHz allows to use the height dainty low-cost capacitors and inductors of less than 1mm. Internal low RDS (ON) The switch realizes it reaches 95% of the efficiency high, thus further lengthen the run time of battery to the maximum extent. In addition, the burst mode (Burst Mode that I2C controls? ) Work with only static electric current (while shutting down of 20uA of every stabilizator
The other characteristics of LTC3577/-X include: One has I2C controlling 60dB luminance (the range of adjusting luminance at 1000:1) And 40V of the grey level control ability connects the back in series and lights 10 - LED driver, the button with the systematic reset function is put through / shut off and controlled, and the double-channel 150mA electric current limits LDO.
LTC3577/-X supplies from stock, adopts the compactness, flat flat (0.75mm) 4mm x 7mm QFN-44 capsulates. Regard 1,000 as the unit to buy in batches, each price is 4.95 dollars. If need more information, please log on www.linear.com.cn.
USB compatible linear power supervisor + battery charger + 3 stepping down stabilizators synchronously + OVP + is used in 10 Piece drive device + button of LED put through / shut off and control + two LDOs
Characteristic summary: LTC3577, LTC3577-1, LTC3577-3 And LTC357704
Intact many functions PMIC: Linear power supervisor, lithium ion / polymer battery charger, 3 stepping down synchronously stabilizators, used in The drivers of 10 LEDs, two 150mA LDOs, button put through / shut off and control Heat-resisting enhancement type, tabular (0.75mm) 44 lead wire 4mm x 7mm QFN capsulates Power supervisor and battery charger
Use AC adapter it inputs to be can the intersection of charging current and programming to up to

















