SUMMIT Microelectronics: Product Summary: SMB328A/B: Programmable Switch-mode, Li+ Battery Chargers with TurboCharge™ Mode, USB “On- the-Go” Power, Battery Missing Detection and Automatic Input Current Limiting

SUMMIT Microelectronics: Product Summary: SMB328A/B
Preliminary Information


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	Download/view the SMB328A/B one page data sheet. Please contact your Summit Sales Representative for a full datasheet.
	Download/view the SMB328A/B Fact Sheet

	Read our press release for the SMB328A/B.
	View the company ads for this product.
Electronic Products, May 24, 2011 Fundamentals of battery charging: Part 1 by George Paparrizos, Product Marketing Director, Summit Microelectronics, Inc.
EN-Genius Network Announces 2010 Product Of The Year Winners: SMB328A/B - Best High-Efficiency Switch-Mode Battery Chargers, Feb. 2011
Product Systems Design, October 01, 2010 Smart Battery Management in Medical Devices by Shadi Hawawini, Senior Applications Engineer, and George Paparrizos, Product Marketing Director, Summit Microelectronics, Inc.
Switch-Mode Battery Chargers with Programmable JEITA Support, Low-Power Design, May 2010

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SMB328A/B SYSTEM APPLCIATION: Summit Microelectronics, Inc.

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

SMB328A/B: Programmable Switch-mode, Li+ Battery Chargers with TurboCharge™ Mode, USB “On- the-Go” Power, Battery Missing Detection and Automatic Input Current Limiting

FEATURES

SMB328A with I2C and SMB328B with pin control

Automatic input current limit *

USB or AC input with programmable input current limiting

Up to 1.2A continuous charging current from AC adapter

Up to 750mA charging current from 500mA USB port using
automatic TurboCharge™ mode*

+4.00 to +6.3V input range (+20V input protected)

USB “On-the-Go” Power support for USB OTG enabled
devices (+5V reverse output @ 500mA)

50mA LDO 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%

Supports JISC8714 and JEITA standards

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

CSP-20 package (0.4mm pitch lead-free)

INTRODUCTION

The SMB328 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 SMB328 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 SMB328’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 LDO output provides a bypass power supply to boot the system for “instant on” without waiting for charging in case of a dead battery. The SMB328 also supports USB On-the-Go devices by providing the required USB- OTG +5V power supply using the Li-Ion battery as a source.

Continued in PDF | * Patents pending