SMB339: Programmable Switch-mode, Li+ Battery Charger with TurboCharge™ Mode, USB “On-the-Go” Power, USB Power Source Detection and Automatic Input Current Limiting
FEATURES
Automatic input current limit*
Optional automatic power source detection per latest USB charging specification 1.0
USB or AC input with programmable input current limiting
Up to 1.25A continuous charging current from AC adapter
Up to 750mA charging current from 500mA USB port using
automatic TurboCharge™ mode*
+4.35 to +6.2V input voltage range (+16V tolerant)
USB “On-the-Go” Power support for USB OTG enabled
devices (+5V reverse output @ 500mA)
uCSP-20 RoHS/lead-free package with 0.4mm ball pitch
Compliant with CCSA YD/T 1591-2006
APPLICATIONS
2.5G/3G/GSM/CDMA Phones
Smartphones/PDAs
Portable Media Players
Portable GPS Terminals
Handheld Game Consoles
* Patents pending
INTRODUCTION
The SMB339 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 SMB339
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 SMB339’s high-efficiency, switchmode
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. The SMB339 also supports
USB On-the-Go devices by providing the required USB-OTG +5V
power supply using the Li-Ion battery as a source.
