SMB329BN Programmable Switch-mode, Li+ Battery Chargers with TurboCharge Mode QFN spot stock

Product Descriptions

The SMB329 and SMB339 are programmable single-cell lithium-ion/lithiumpolymer battery chargers designed for a variety of portable applications.  The devices provide a simple and efficient way to charge high-capacity LiIon batteries via a USB or AC adapter input. Furthermore, the SMB329 and  SMB339 are 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 SMB329’s and SMB339’s high-efficiency,  switch-mode 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. A 50mA SYSON switch output  provides a bypass power supply to boot the system for “instant on” without  waiting for charging in case of a dead battery (SMB329 only). Both products  also support USB On-the-Go devices by providing the required USB-OTG  +5V power supply using the Li-Ion battery as a source.

The SMB329 and SMB339 can switch between USB mode and AC Adapter  mode and work seamlessly in conjunction with a USB controller.  Furthermore, they offer the option to automatically differentiate an AC/DC  wall adapter from a USB2.0 hub via the D+/D- USB lines, making them  compatible with USB battery charging specification 1.0.

Charge control includes qualification, trickle-charge, pre-charge, constant  current/constant voltage, float voltage and termination/safety settings that  are fully programmable via a serial I2C/SMBus, making the devices truly a  flexible solution. Fast charge current level can be set via I2C (limited in USB  mode to ensure 100mA or 500mA input). Built-in is reverse-current blocking  to prevent inadvertent cell discharge. The SMB329 and SMB339 offer the  option to automatically charge the battery only when the battery voltage is  below a selectable “dead-battery” threshold. High-frequency operation and  integrated power FETs contribute to a reduced external component count  and size.

The SMB329 and SMB339 also offer several features that protect the  battery pack as well as the charger and input circuitry: over-current,  under/over-voltage and thermal protection. Ultra-accurate, 1% battery float  voltage control improves battery capacity utilization. The STAT output is an  interrupt to flag various status/flag events (programmable selection) and the  status register can be read via the serial port. The SMB329 and SMB339  are available in an ultra-compact lead-free uCSP-20 package and are rated  over the –30C to +85C temperature range. The SMB329 is also offered in a  4x4 QFN-24 package.

Product 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 range (+18V input protected)

• USB “On-the-Go” Power support for USB OTG enabled devices (+5V reverse output @ 500mA)

• 50mA SYSON output for “dead battery” boot-up (SMB329)

• Analog output voltage for direct charge current measurement

• Reverse current blocking

• High-efficiency 3MHz current-mode step-down regulator

• Integrated frequency compensation and power MOSFETs

• High-accuracy float voltage regulation: 1%

• Pre-charge and complete-charge safety timers

• Battery pack thermal monitor

• Digital programming of all major parameters via I2C interface

(One-time programmable for default, non-volatile settings)

o Fast charge voltage threshold, float voltage

o Pre-charge, fast charge, termination current

• Status register monitors and flags charger operation

o Charge in-progress/termination

o Charge timer fault

o Over-current limiting

o UV/OV detection/shutdown

• 1.95mm x 2.22mm CSP-20 package (0.4mm pitch lead-free)

Product Applications

• 2.5G/3G/GSM/CDMA Phones

• Smartphones/PDAs

• Portable Media Players

• Portable GPS Terminals

• Handheld Game Consoles

Product Photos

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