LTC3554EUD#PBF

LTC3554 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 applications, this device power manages automatically limit 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. It 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. It is used in application such as USB-based handheld products, portable Li-ion/polymer based electronic devices, fitness computers, low power medical devices etc.

• 240Mohm internal ideal diode
• Pushbutton on/off control with system reset
• Reset time is 5sec
• Full featured Li-ion/polymer battery charger
• Programmable charge current with thermal limiting
• Instant-on operation with discharged battery
• Battery float voltage is 4.2V
• Oscillator frequency is 2.25MHz typical at (TA = 25°C)
• Operating temperature is -40°C to 85°C
• Package style is 20-lead plastic QFN

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