2.5 A CurrentPath Charger IC Enables Safe, Ultrafast Charging

Summit Microelectronics has expanded its fourth-generation family of programmable Li-Ion battery charger integrated circuits (ICs) with the introduction of two new products. The SMB346 and SMB347 deliver up to 2.5 A charge/system current with dual input/dual output CurrentPath technology for operation with a dead or missing battery.

Dual inputs accept both USB and AC/DC with automatic selection and support for all battery charging standards: USB 2.0 specification, USB on-the-go supplement, USB battery charging specification 1.2, IEEE1725 standard, Chinese USB charging specification, and others. Furthermore, the SMB346 and SMB347 are the only battery charger ICs with CurrentPath to detect the input source type (USB host/hub/charger, AC/DC) and automatically optimize operation for the fastest and safest battery charging.

The SMB346 and SMB347 are based on a 3 MHz, switch-mode DC-DC architecture, with minimal external components, which allows for more than 90 percent efficient conversion and compact solution size. The devices enable fast charging due to higher charge currents, while reduced thermal dissipation improves user comfort, system reliability and Green operation. Furthermore, Summit’s proprietary TurboCharge patent-pending technology enables high charge current, even from relatively low-power sources. As consumer devices continue to employ larger batteries, the SMB346 and SMB347 reduce charge time for consumer convenience.

The SMB346 and SMB347 are well suited for a wide range of portable devices such as smartphones, tablets, digital still cameras, digital camcorders, wireless routers, portable media/MP3 players (PMP), portable GPS navigation equipment and portable game consoles/controllers. The features and integration of the SMB346 and SMB347 make them well suited for portable devices that utilize high capacity batteries, for example, desire short charging time and feature very compact industrial designs. The SMB346 and SMB347 operate with an input range from 3.7 V to 6.2 V input and safely withstand continuous input over-voltage up to 20 V (non-operating), while protecting downstream circuitry.

The SMB346 and SMB347 are offered in a 2.46 mm by 2.96 mm, 30-ball, lead-free chip-scale (CSP) packages. Both products have an operating temperature range of -30°C to 85°C. Available now in production quantities, the SMB346 is priced at $1.27 and the SMB347 is priced at $1.36, each in quantities of 10,000 units.

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