SUMMIT Microelectronics: Product Summary: SMB135 - Programmable Switch-mode, USB/AC Input Li+ Battery Charger with TurboCharge™ Mode

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FEATURES

Programmable USB/AC Li-Ion battery charger

TurboCharge™ Mode: 750mA output from 500mA USB

High-efficiency current-mode PWM controller

- 750kHz to 1.25MHz switching frequency

- 0% to 100% duty-cycle

4.35 to 6.5V input voltage range

Small 1.3 x 2.1 uCSP™-15 package (0.4mm pitch)

High-accuracy output voltage regulation: 1%

Low reverse leakage current

Digital programming of all major parameters via I2C interface (with several addresses) and non-volatile memory

- Battery voltage set point

- Pre-charge, fast charge, termination current

- Fast charge voltage threshold

- Temperature limits

- Automatic restart threshold

Status/Fault indicator

Stability with ceramic capacitors

Wide range of protection features

-Thermal monitor

-Safety timers

-Current limit

- Input/output over-voltage lockout

APPLICATIONS

GSM Handsets

UMTS Handsets

Portable Media & Gaming Players

Digital camcorders/still cameras

Handheld GPS/PDA’s

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

INTRODUCTION

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.

Charge control includes qualification, trickle-charge, pre-charge, constant current/constant voltage, and termination/safety settings that are fully programmable via a serial I2C/SMBus making the device truly a flexible solution. Fast charge current level (one or five unit loads) can be set via I2C or an input pin (USB500/100). An Enable (EN) pin is also provided for suspending USB charging and allowing the device to work in parallel with AC charger, which may already be integrated into a PMIC device. In this case, the SMB135 does not allow current to flow back to the USB port.

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SMB135 Applications Block Diagram

SMB135 5mm x 5mm QFN-32
Package and Pin Descriptions

SMB135 15-Ball Ultra CSP™
Package and Pin Descriptions

ORDERING INFORMATION

NOTE 1 - This is a data sheet that describes a Summit part that is in production.

SUMMIT Microelectronics, Inc. reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. SUMMIT Microelectronics, Inc. assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained herein reflect representative operating parameters, and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked, SUMMIT Microelectronics, Inc. shall not be liable for any damages arising as a result of any error or omission.

SUMMIT Microelectronics, Inc. does not recommend the use of any of its products in life support or aviation applications where the failure or malfunction of the product can reasonably be expected to cause any failure of either system or to significantly affect their safety or effectiveness. Products are not authorized for use in such applications unless SUMMIT Microelectronics, Inc. receives written assurances, to its satisfaction, that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; and (c) potential liability of SUMMIT Microelectronics, Inc. is adequately protected under the circumstances.

Revision 3.0 - This document supersedes all previous versions.

Ultra CSP™ is a registered name of FlipChip International, LLC.

* Patent Pending