USB Power Management, 3 Step Down DC/DC, Li-Ion/Polymer Charger, 4.35 V to 5.5 V in, QFN-28

LTC3555EUFD#PBF - USB Power Management, 3 Step Down DC/DC, Li-Ion/Polymer Charger, 4.35 V to 5.5 V in, QFN-28

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Product Overview

The LTC3555EUFD#PBF is a highly integrated USB compatible Power Management and Battery Charger IC for Li-Ion/Polymer battery applications. They include a high efficiency current limited switching PowerPath manager with automatic load prioritization, a battery charger, an ideal diode and three general purpose synchronous step-down switching regulators. The LTC3555 family limits input current to either 100 or 500mA for USB applications or 1A for adapter-powered applications. Unlike linear chargers, the LTC3555 family's switching architecture transmits nearly all of the power available from the USB port to the load with minimal loss and heat which eases thermal constraints in small spaces. Two of the three general purpose switching regulators can provide up to 400mA and the third can deliver 1A. The entire product can be controlled via I2C or simple I/O. The LTC3555-1/LTC3555-3 versions offer "instant-on" power delivery to the portable product even with a very low battery voltage.
  • High efficiency switching PowerPath™ controller with Bat-Track™ adaptive output control
  • Full featured Li-ion/polymer battery charger
  • 1.5A Maximum charge current
  • Internal 180mR ideal diode + external ideal diode controller powers load in battery mode
  • Low no-load quiescent current when powered from BAT (<32µA)
  • Triple high efficiency step-down DC/DCs (1A/400mA/400mA IOUT)
  • All regulators operate at 2.25MHz
  • Dynamic voltage scaling on two outputs
  • I2C or independent enable, VOUT controls


Medical, Test & Measurement

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MSL 1 - Unlimited
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