Analog Devices Inc./Maxim Integrated

The LTC3553-2 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, the LTC3553-2 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 LTC3553-2 also includes a synchronous buck regulator, an always-on low dropout linear regulator (LDO), and a pushbutton controller. With all supplies enabled in standby mode, the quiescent current drawn from the battery is only 12μA. The LTC3553-2 is available in a 3mm × 3mm × 0.75mm 20-pin QFN package.OptionsLDOPGOODHard Reset TimeLTC3553ON/OFF ControlNo5 secondsLTC3553-2Always OnYes14 secondsApplicationsUSB-Based Handheld ProductsPortable Li-Ion/Polymer Based Electronic DevicesWearable ElectronicsLow Power Medical Devices

The LTC3553-2 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, the LTC3553-2 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 LTC3553-2 also includes a synchronous buck regulator, an always-on low dropout linear regulator (LDO), and a pushbutton controller. With all supplies enabled in standby mode, the quiescent current drawn from the battery is only 12μA. The LTC3553-2 is available in a 3mm × 3mm × 0.75mm 20-pin QFN package.OptionsLDOPGOODHard Reset TimeLTC3553ON/OFF ControlNo5 secondsLTC3553-2Always OnYes14 secondsApplicationsUSB-Based Handheld ProductsPortable Li-Ion/Polymer Based Electronic DevicesWearable ElectronicsLow Power Medical Devices

The LTC3554 family are micropower, highly integrated power management and battery charger ICs for single-cell Li-Ion/Polymer battery applications. They include a PowerPath™manager with automatic load prioritization, a battery charger, an ideal diode and numerous internal protection features. Designed specifically for USB applications, the LTC3554 power managers 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.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 family are available in a 3mm × 3mm × 0.75mm 20-lead QFN package.ApplicationsUSB-Based Handheld ProductsPortable Li-Ion/Polymer Based Electronic DevicesFitness ComputersLow Power Medical Devices

The LTC3556 is a highly integrated power management and battery charger IC for Li-Ion/Polymer battery applications. It includes a high efficiency current limited switching PowerPath manager with automatic load prioritization, a battery charger, an ideal diode, and three synchronous switching regulators (two bucks and one buck-boost). Designed specifically for USB applications, the LTC3556’s switching power manager automatically limits input current to a maximum of either 100mA or 500mA for USB applications or 1A for adapter-powered applicationsThe LTC3556’s switching input stage transmits nearly all of the 2.5W available from the USB port to the system load with minimal power wasted as heat. This feature allows the LTC3556 to provide more power to the application and eases the constraint of thermal budgeting in small spaces. The two buck regulators can provide up to 400mA each and the buck-boost can deliver 1A..The LTC3556 is available in the low profile 28-pin (4mm × 5mm × 0.75mm) QFN surface mount package.ApplicationsHDD-Based MP3 Players, PDAs, GPS, PMPsOther USB-Based Handheld Products

The LTC3559/LTC3559-1 are USB battery chargers with dual high efficiency buck regulators. The parts are ideally suited to power single-cell Li-Ion/Polymer based handheld applications needing multiple supply rails.Battery charge current is programmed via the PROG pin and the HPWR pin, with capability up to 950mA at the BAT pin. The battery charger has an NTC input for temperature qualified charging. TheCHRGpin allows battery status to be monitored continuously during the charging process. An internal timer controls charger termination.Each monolithic synchronous buck regulator provides up to 400mA of output current while operating at efficiencies greater than 90% over the entire Li-Ion/Polymer range. A MODE pin provides the flexibility to place both buck regulators in a power saving Burst Mode operation or a low noise pulse skip mode.The LTC3559/LTC3559-1 are offered in a low profile thermally enhanced 16-lead (3mm × 3mm) QFN package.ApplicationsSD/Flash-Based MP3 PlayersLow Power Handheld Applications