Product category:
Power Supply ICs and Controllers
News Release from: 2001 Electronic Components | Subject: Semtech SC801
Edited by the Electronicstalk Editorial
Team on 11 March 2003
Smart Li-ion charger shrinks to tiny
package
The SC801 is a feature-rich, programmable Li-ion battery-charging system capable of delivering 1.5A in fast-charge mode.
Housed in a 1mm-high 4 x 4mm thermally enhanced microleaded package, the SC801 is a feature-rich, programmable Li-ion battery-charging system capable of delivering 1.5A in fast-charge mode Manufactured by Semtech and available from 2001 Electronic Components, the SC801 can cut cost, design time and board space making it very attractive for use in high-volume portable equipment such as cellular phones, personal digital assistants, digital cameras, handheld computers as well as other portable and battery-powered electronic products
This article was originally published on Electronicstalk on 30 Jan 2003 at 8.00am (UK)
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Integrating charge controller, thermally protected mosfet, reverse blocking diode, and sense resistor, the SC801 works equally well as a charging system for nickel-cadmium and nickel-metal-hydride batteries or as a general-purpose programmable current source.
The major performance feature of the SC801 is its fast-charge current of up to 1.5A.
To avoid overheating a fully discharged battery, the device automatically invokes a precharge mode, limiting charge current to 10mA to 125mA for batteries under 2.8V, only switching to its fast charge mode after the battery voltage reaches the 2.8V threshold.
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Several functional features make the SC801 easy to use in a wide range of products and designs.
The SC801 accepts input voltages from 4.2 to 14V to yield a selectable output of either 4.1 or 4.2V regulated to 1% accuracy.
Designers can customise the charge pattern by offering programmable precharge, fast charge, and charge termination currents.
As a result, charging can be done safely over the full industrial temperature range.
Battery monitoring and protection features are among the other strengths of the SC801.
For instance, output flags can directly drive LEDs to indicate overvoltage fault, charge (adapter) present, and charging or end-of-charging conditions.
Also, a battery-in-place indication notes whether a battery is present and, if not, configures the SC801 to work as a conventional low dropout (LDO) voltage regulator to correctly power the system.
Other monitoring functions include Kelvin sensor inputs to monitor the temperature or the voltage at the battery terminals and an output current mode monitor.
The SC801 features soft-start operation in the event of step loads or step inputs for when a power adapter is connected.
All charge modes are protected against overcurrent and overvoltage conditions.
To save power - a key requirement in portable electronic products - the SC801 draws just 1uA in monitor and shutdown modes.
Samples and further information are available from 2001 Electronic Components.
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