Battery Charger operates independent of host IC.
Share:
Press Release Summary:
Smart battery-charger controller, Model LTC4100, operates with or without host microcontroller. It charges 6.4-26 V multiple-cell, Li-Ion and Nickel-chemistry batteries at up to 4 A, with 0.8% voltage accuracy and 5% current accuracy, respectively. Synchronous switching operation provides constant-current/constant-voltage charging from input supply voltage of 6-28 V. Model LTC4100 meets requirements of Smart Battery System Level 2 charging functions.
Original Press Release:
Smart Battery Charger Operates with or without Host SMBus Controller
MILPITAS, CA - October 21, 2003 - Linear Technology Corporation introduces the LTC4100, a precision smart battery charger controller that operates with or without a host microcontroller. The LTC4100 operates independent of a host IC and reducing design time and complexity by eliminating the need for writing and debugging firmware. The IC is 100% compliant with Rev. 1.1 SMBus specifications and meets the requirements of Smart Battery System (SBS) Level 2 charging functions. It charges 6.4V to 26V multiple-cell Li-Ion and Nickel-chemistry batteries at up to 4A with 0.8% voltage accuracy and 5% current accuracy, respectively. Synchronous switching operation provides high efficiency constant-current/constant-voltage charging from a wide input supply voltage range of 6V to 28V. To minimize SMBus timing errors due to bus capacitance and noise, the LTC4100 features a patented SMBus Acceleratorä and a high-noise immunity SafetySignal sensor. The LTC4100 is housed in a small 24-pin SSOP and is ideal for use in portable computers and instruments, RAID systems and battery backup in telecom equipment.
The LTC4100 integrates both 10-bit DACs for charge current and an 11-bit DAC for charge voltage programming,respectively. With the charger's input current limit function, maximum charge rate is achieved without overloading the input supply such as a wall adapter. The LTC4100 automatically monitors battery temperature, connectivity and battery type information. The SMBus interface remains alive when the input power is removed and responds to all SMBus activity directed to it including SafetySignal status, which monitors the battery temperature, connectivity and battery type information.
The LTC4100 is rated for operation from -40°C to 85°C. Pricing starts at $5.00 each in 1,000-piece quantities.
Summary of Features: LTC4100
100% Compliant (Rev. 1.1) SMBus Support Operates with or without Host
SMBus Accelerator Improves SMBus Timing
High Efficiency Synchronous Buck Charger
AC Adapter Current Limit Maximized Charge Rate
Small 24-Pin Narrow SSOP Package
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators,power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequencydevices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.
Call toll-free 1-800-4-LINEAR (for literature only), or go to the company's web site: www.linear.com
Note: LT, AND LTC are registered trademarks of Linear Technology Corp.
