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