Up to 210mA charge current (contact factory for higher current version )
Stable with small ceramic capacitors
4.35 to 6.5V input voltage range
Small 1.3 x 2.1 uCSP™ package (0.4mm pitch)
High-accuracy output voltage regulation: 1%
Low reverse leakage current
Digital programming of all major parameters via I²C interface and lockable non-volatile memory
Battery voltage set point
Pre-charge, fast charge, termination current
Fast charge voltage threshold
Temperature limits
Charge safety timers
Automatic restart threshold
Fault/Status indicator
Wide range of protection features
Thermal regulation
Input/output over-voltage lockout
APPLICATIONS
Bluetooth & Stereo Headsets
Noise Cancellation Headphones
MP3 Players
Wrist PDA/Watches
Toys
Handheld Equipment
PACKAGE AND PIN CONFIGURATION
Bottom View (Balls facing up)
SMB139 - Programmable Linear Battery Charger in 1.3 x 2.1 uCSP™
INTRODUCTION
The SMB139 is a programmable single-cell lithium-ion/lithium-polymer battery charger for a variety of portable applications. The device provides a simple way to charge low-capacity Li-Ion or Li-Polymer batteries via a USB port or an AC port. Unlike conventional devices, the SMB139's very small package and high level of configurability simplify design in a wide range of handheld equipment.
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. Pre-charge, fast charge and termination current levels can be set via I²C commands. The Enable (EN) pin is used for suspending or re-staring the charging process.
The SMB139 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, float voltage control 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. As a protection mechanism, when the junction temperature approaches approximately 110°C, the SMB139 will start to reduce charge current to ensure device and system reliability, while charging the battery cell as fast as possible.
The SMB139 is available in a space-saving 1.3mm x 2.1mm uCSP™ package with lead-free balls and is rated over the -30°C to +85°C temperature range.
NOTE 1 - This is a Final 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.
