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Mobilna Elektronika Praktyczna

Podzespoły  ISL9238 i ISL9238A - układy do ładowarek akumulatorów 

 

Firma Intersil powiększyła rodzinę układów USB-C Buck-Boost do ładowarek akumulatorów o dwa nowe typy: ISL9238 i ISL9238A. Są one przeznaczone do zastosowania w urządzeniach mobilnych z interfejsem USB. Są to układy dwukierunkowe, pozwalające na zastąpienie dwóch układów scalonych (zasilacza z przetwarzaniem i ładowarki) mogących pracować w trybach buck, boost i buck-boost.

Umożliwiają ładowanie z zewnętrznego źródła wewnętrznego akumulatora zawierającego do 4 ogniw Li-Ion oraz ładowanie akumulatora urządzeń zewnętrznych, np. zestawu słuchawkowego, dołączonych do USB Type C w trybie OTG. Są w stanie dostarczyć do portu USB Type C maksymalną moc 100 W (20 V/5 A).

Układ ISL9238A ma tę samą funkcjonalność, co ISL9238, ale różni się adresami szyny SMBus, co ma znaczenie dla producentów OEM chcących zastosować oba układy w urządzeniach z dwoma interfejsami USB Type C. Układy mają programowalne funkcje SMBus/I²C, takie jak trickle charge czy dwupoziomowe ograniczenie natężenia prądu.

Po zaprogramowaniu parametrów mogą pracować w trybie autonomicznym oraz dodatkowo zostały wyposażone w timer bezpieczeństwa automatycznie kończący proces ładowania po określonym czasie.

Pod względem rozkładu wyprowadzeń, ISL9238 i ISL9238A są kompatybilne z wcześniejszym modelem ISL9237 dla portu USB Type C. Układy ISL9238 i ISL9238A są oferowane w obudowie TQFN-32 zajmującej powierzchnię 16 mm² (4 mm×4 mm).

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