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LTC3554EPD Datasheet(PDF) 1 Page - Linear Technology |
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LTC3554EPD Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC3554 1 3554f TYPICAL APPLICATION DESCRIPTION Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators The LTC®3554 is a micropower, highly integrated power management and battery charger IC for single-cell Li-Ion/Polymer battery applications. It includes a PowerPath manager with automatic load prioritization, a battery charger, an ideal diode and numerous internal protection features. Designed specifically for USB applica- tions, the LTC3554 power manager automatically limits input current to a maximum of either 100mA or 500mA. Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the selected input current limit. The LTC3554 also includes two synchronous step-down switching regulators as well as a pushbutton controller. With all supplies enabled in standby mode, the quiescent current drawn from the battery is only 10μA. The LTC3554 is available in a 3mm × 3mm × 0.55mm 20-pin UTQFN package. Battery Drain Current vs Temperature FEATURES APPLICATIONS n 10μA Standby Mode Quiescent Current (All Outputs On) n Seamless Transition Between Input Power Sources: Li-Ion/Polymer Battery and USB n 240mΩ Internal Ideal Diode Provides Low Loss PowerPath™ n Dual High Efficiency Step-Down Switching Regulators (200mA IOUT) with Adjustable Output Voltages n Pushbutton On/Off Control with System Reset n Full Featured Li-Ion/Polymer Battery Charger n Programmable Charge Current with Thermal Limiting n Instant-On Operation with Discharged Battery n Compact Ultrathin 3mm × 3mm × 0.55mm 20-Pin UTQFN Package n USB-Based Handheld Products n Portable Li-Ion/Polymer Based Electronic Devices n Wearable Computers n Low Power Medical Devices VBUS NTC PROG HPWR SUSP PWR_ON1 FSEL STBY PGOOD PWR_ON2 PBSTAT ON VOUT CHRG BAT BVIN SW1 FB1 SW2 FB2 ON/OFF Li-Ion BATTERY 10μF 100k 100k T 1.87k 10pF 10μF 2.2μF 2.05M 649k 3.3V 200mA 4.7μH 10pF 10μF 332k 649k 1.2V 200mA 3554 TA01a 10μH SYSTEM LOAD 4.35V TO 5.5V USB INPUT LTC3554 + TEMPERATURE (°C) –75 –50 –25 25 50 75 100 125 0 0 4 6 10 14 12 8 3554 TA01b 2 BOTH REGULATORS DISABLED ONE REGULATOR ENABLED HARD RESET BOTH REGULATORS ENABLED VBAT = 3.8V STBY = 3.8V REGULATORS LOAD = 0mA L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364, 5481178, 6304066, 6570372, 6580258, 7511390. |
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