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SMB339 Datasheet(PDF) 1 Page - Summit Microelectronics, Inc. |
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SMB339 Datasheet(HTML) 1 Page - Summit Microelectronics, Inc. |
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1 / 1 page SMB329/SMB339 Preliminary Information © SUMMIT Microelectronics, Inc. 2004 • 757 N. Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266 http://www.summitmicro.com/ 2132 2.6 5/5/2009 1 Programmable Switch-mode, Li+ Battery Chargers with TurboCharge™ Mode, USB “On- the-Go” Power, USB Power Source Detection and Automatic Input Current Limiting 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 I 2C 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 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. SYSTEM APPLICATION FEATURES & APPLICATIONS Handheld System USB USB USB 500mA 4.35V-5.5V AC/DC 300-1800mA 4.5V-6.0V I2C System SMB329 SMB339 Li-Ion USB Total Output 550-1250mA To System USB-OTG Output 500mA "Instant On" Power 50mA (SMB329) ADC Figure 1 – Using the SMB329/339 to charge a single cell Li+ battery from USB or AC Adapter power sources. * Patents pending |
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