SUMMIT Microelectronics: Product Summary: SMB329B: Programmable Switch-mode, Li+ Battery Chargers with TurboCharge™ Mode, USB “On- the-Go” Power, USB Power Source Detection and Automatic Input Current Limiting

SUMMIT Microelectronics: Product Summary: SMB329B
Preliminary Information


A complete index to all Product Summary pages

	Download/view the SMB329B one page data sheet. Please contact your Summit Sales Representative for a full datasheet
	Download/view the SMB329B Fact Sheet
	Applications Note 71: Design and Manufacturing with Summit Microelectronic’s WLCSP Products



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SMB329B BLOCK DIAGRAM: Summit Microelectronics, Inc.

APPLICATIONS
	2.5G/3G/GSM/CDMA Phones
	Smartphones/PDAs
	Portable Media Players
	Portable GPS Terminals
	Handheld Game Consoles

SMB329B Product image: Summit Microelectronics, Inc.

SMB329B: Programmable Switch-mode, Li+ Battery Charger with TurboCharge™ Mode, USB “On- the-Go” Power, USB Power Source Detection and Automatic Input Current Limiting

FEATURES
	Automatic input current limit*
	Optional automatic power source detection per latest USB charging specification 1.0
	USB or AC input with programmable input current limiting
	Up to 1.15A continuous charging current from AC adapter
	Up to 750mA charging current from 500mA USB port using automatic TurboCharge™ mode*
	+4.35 to +6.2V input range (+20V input protected)
	USB “On-the-Go” Power support for USB OTG enabled devices (+5V reverse output @ 500mA)
	50mA SYSON output for “dead battery” boot-up
	Analog output voltage for direct charge current measurement
	Reverse current blocking
	High-efficiency 3MHz current-mode step-down regulator
	Integrated frequency compensation and power MOSFETs
	High-accuracy float voltage regulation: 1%
	Pre-charge and complete-charge safety timers
	Battery pack thermal monitor
	Digital programming of all major parameters via I2C interface (One-time programmable for default, non-volatile settings)
	- Fast charge voltage threshold, float voltage - Pre-charge, fast charge, termination current
	Status register monitors and flags charger operation
	- Charge in-progress/termination - Charge timer fault - Over-current limiting - UV/OV detection/shutdown
	1.95mm x 2.22mm CSP-20 package (0.4mm pitch lead-free)

INTRODUCTION

The SMB329B is a programmable single-cell lithium-ion/lithium-polymer battery charger designed for a variety of portable applications. The device provides a simple and efficient way to charge high-capacity Li-Ion batteries via a USB or AC adapter input. Furthermore, the SMB329B is able to automatically adjust input current level by detecting the AC/DC adapter’s maximum stable output current, thereby automatically matching wall adapter to electronic device.

Unlike conventional devices, the SMB329B’s high-efficiency, switch-mode operation eliminates the thermal problems of conventional linear solutions. Also the buck converter architecture effectively multiplies the input current to increase charge rate for the Li+ cell and uses current limited supplies like USB more efficiently. A 50mA SYSON switch output provides a bypass power supply to boot the system for “instant on” without waiting for charging in case of a dead battery. The SMB329B product also supports USB On- the-Go devices by providing the required USB-OTG +5V power supply using the Li-Ion battery as a source.

The SMB329B can switch between USB mode and AC Adapter mode and work seamlessly in conjunction with a USB controller. Furthermore, it offers the option to automatically differentiate an AC/DC wall adapter from a USB2.0 hub via the D+/D- USB lines, making the device compatible with USB battery charging specification 1.0.

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* Patents Pending