SMB338P - Datasheet Archive

 

Programmable Switch-mode, Li+ Battery Charger with TurboChargeTM Mode, USB "On- theGo" Power and Automatic Input

 

SMB338P SMB338P Programmable Switch-mode, Li+ Battery Charger with TurboChargeTM Mode, USB "On- theGo" Power and Automatic Input Current Limiting FEATURES & APPLICATIONS · · · · · · · · · · · INTRODUCTION Automatic input current limit * 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 TurboChargeTM mode * +4.35 to +6.2V input voltage range (+18V tolerant) USB "On-the-Go" Power support for USB OTG enabled devices (+5V reverse output @ 500mA) Reverse current blocking High-efficiency 2.2MHz current-mode step-down regulator Integrated frequency compensation Internal power MOSFETs High-accuracy float voltage regulation: 1% Pre-charge and complete-charge safety timers 2 Digital programming of all major parameters via I C 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 uCSP-20 RoHS/lead-free package with 0.4mm ball pitch The SMB338P SMB338P is a programmable single-cell lithium-ion/lithiumpolymer 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 SMB338P SMB338P is able to automatically adjust input current level by monitoring the status of the adapter voltage. Unlike conventional devices, the SMB338P SMB338P'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 SMB338P SMB338P also supports USB On-the-Go devices by providing the required USB-OTG +5V power supply using the Li-Ion battery as a source. The SMB338P SMB338P can switch between USB mode and AC Adapter mode and works seamlessly in conjunction with a USB controller. 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 device 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 SMB338P SMB338P offers 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. Applications · · · · · The SMB338P SMB338P also offers several features that protect the battery pack as well as the charger and input circuitry: over-current, under/overvoltage 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 SMB338P SMB338P is available in an ultra-compact lead-free uCSP-20 package and is rated over the ­30C to +85C temperature range. 2.5G/3G/GSM/CDMA Phones Smartphones/PDAs Portable Media Players Portable GPS Terminal Handheld Game Consoles * Patents pending SYSTEM APPLICATION USB 500mA 4.35V-5.5V Handheld System USB-OTG Output 500mA VB US D- USB D+ NC GND USB SMB338P SMB338P Total Output 550-1250mA Charging · · · · To System Li-Ion I2C System USB AC/DC 300-1800mA 4.5V-6.0V Figure 1 ­ Using the SMB338P SMB338P 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 408 523-1000 · FAX 408 523-1266 http://www.summitmicro.com/ 2142 3.2 3/1/2010 1