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.

FEATURES & APPLICATIONS

• World’s smallest linear charger

• Linear charging for reduced board space

o Up to 210mA charge current *

o Stable with small ceramic capacitors

• 4.35 to 6.5V input voltage range

• Small 1.3 x 2.1 uCSPTM 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

o Battery voltage set point

o Pre-charge, fast charge, termination current

o Fast charge voltage threshold

o Temperature limits

o Charge safety timers

o Automatic restart threshold

• Fault/Status indicator

• Wide range of protection features

o Thermal regulation

o Input/output over-voltage lockout

Applications

• Bluetooth & Stereo Headsets

• Noise Cancellation Headphones

• MP3 Players

• Wrist PDA/Watches

• Toys

• Handheld Equipment