Micropower power management IC integrates a USB PowerPath manager, single-cell Li-Ion/Polymer battery charger, ideal diode and two synchronous step-down regulators. The USB input supports automatic 100 mA or 500 mA current limiting while prioritizing system load and reducing charge current as needed. The dual adjustable buck regulators provide 200 mA outputs, and the device draws 10 µA from the battery in standby with all supplies enabled. The family is supplied in a 3 mm × 3 mm × 0.75 mm 20-lead QFN package for portable USB-powered products.
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| Product class | USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
| Battery chemistry | Single-cell Li-Ion/Polymer |
| Standby mode quiescent current | 10µA |
| USB input supply voltage | 4.35 to 5.5V |
| USB input current limit, low-power mode | 100 maxmA |
| USB input current limit, high-power mode | 500 maxmA |
| Internal ideal diode on-resistance | 240mΩ |
| Step-down regulator count | 2 |
| Step-down regulator output current | 200 eachmA |
| Battery float voltage | 4.2V |
| Charge current with 1.87 kΩ PROG resistor | 400 typmA |
| Trickle charge current | 40 typmA |
| Switching regulator input voltage | 2.7 to 5.5V |
| Oscillator frequency, FSEL high | 2.25 typMHz |
| Oscillator frequency, FSEL low | 1.125 typMHz |
| Feedback regulation voltage | 800 typmV |
| Operating temperature range | -40 to 85°C |
| Package | 3 mm x 3 mm x 0.75 mm 20-lead QFN with exposed pad |
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These are design resources that include the Analog Devices LTC3554
Demonstration circuit DC1468A featuring the LTC3554, a micropower USB power manager with a battery charger and two dual synchronous step-down regulators.
