SMB329 Datasheet, PDF (1/1 Pages) Summit Microelectronics, Inc. – Programmable Switch-mode, Li+ Battery Chargers with TurboCharge Mode

SMB329/SMB339
Preliminary Information
Programmable Switch-mode, Li+ Battery Chargers with TurboCharge™ Mode, USB “On-
the-Go” Power, USB Power Source Detection and Automatic Input Current Limiting
FEATURES & APPLICATIONS
INTRODUCTION
• 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)
Applications
• 2.5G/3G/GSM/CDMA Phones
• Smartphones/PDAs
• Portable Media Players
• Portable GPS Terminals
• Handheld Game Consoles
* Patents pending
SYSTEM APPLICATION
The SMB329 and SMB339 are programmable single-cell lithium-ion/lithium-
polymer battery chargers designed for a variety of portable applications.
The devices provide a simple and efficient way to charge high-capacity Li-
Ion 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.
USB
500mA
4.35V-5.5V
Handheld System
"Instant On" Power 50mA (SMB329)
USB-OTG
Output 500mA
Total Output _{To System}
550-1250mA
USB
USB
AC/DC
300-1800mA
4.5V-6.0V
SMB329
SMB339
System
Li-Ion
ADC
I2C
USB
Figure 1 – Using the SMB329/339 to charge a single cell Li+ battery from USB or AC Adapter power sources.
© SUMMIT Microelectronics, Inc. 2004 • 757 N. Mary Avenue • Sunnyvale CA 94085 • Phone [phone] • FAX [phone]
http://www.summitmicro.com/
2132 2.6 5/5/2009
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