Battery-charger controller Summit Microelectronics

SMB135 - Programmable Switch-mode, USB/AC Input Li+ Battery Charger with TurboCharge™ Mode*

The SMB135 is a programmable single-cell lithium-ion/lithium-polymer battery charger for a variety of portable applications. The device provides a simple and efficient way to charge high-capacity Li-Ion batteries via a USB port or an AC adapter. Unlike conventional devices, the SMB135’s high-efficiency operation eliminates large internal temperature rise and localized hot spot in handheld equipment. Summit’s proprietary TurboCharge™ mode allows a 750mA charge current from a 500mA USB port, resulting to significantly reduced charge times.

The SMB135 offers a wide variety of features that protect the battery pack as well as the charger and input circuitry: over-current, under/over-voltage and thermal protection. Ultra-precise, 1% accurate, Kelvin-sensed ADOC™ technology allows accurate control of battery float voltage and improves battery capacity utilization. Status can be monitored via the serial port for charge state and fault conditions. In addition, one LED driver output can be used to signal charge status or an under-/over-voltage condition. As a protection mechanism, when the junction temperature approaches approximately 110°C, the PWM switcher will start to cut back on the duty cycle,

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