Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3552-1
Edited by the Electronicstalk Editorial
Team on 23 June 2006
Charger and regulator cohabit DFN
package
The LTC3552-1 includes a stand-alone Li-ion battery charger and a high efficiency dual synchronous buck regulator housed in a low-profile 3 x 5mm DFN package.
Linear Technology has announced the LTC3552-1, an efficient, compact power management device for handheld applications The LTC3552-1 includes a stand-alone Li-ion battery charger and a high efficiency dual synchronous buck regulator housed in a low-profile 3 x 5mm DFN package
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The linear battery charger can deliver up to 950mA charge current from a wall adapter supply, or up to 500mA charge current from a USB supply.
Stand-alone operation simplifies design, eliminating the need for an external microprocessor for charge termination.
The final float voltage accuracy is +/-1%.
The LTC3552-1's battery charger is equipped with a patented thermal regulation scheme which maximises the charging rate without the risk of overheating.
To preserve battery energy, it draws less than 2.5uA from the battery terminal in standby and less than 1uA in shutdown mode.
The LTC3552-1's two integrated synchronous buck regulators deliver up to 800mA continuous output current at 1.8V, and up to 400mA at 1.575V, respectively.
The internal switches feature an on-resistance range of 0.3 to 0.35ohm to deliver efficiencies as high as 92%, maximising battery run time.
In addition, automatic burst mode operation optimises efficiency at light loads with quiescent current of only 40uA (less than 1uA in shutdown).
Using a constant frequency current mode architecture, the buck regulator operates from an input voltage range of 2.5 to 5.5V, making it ideal for single-cell Li-ion/Li-polymer, multicell alkaline or NiMH input applications.
Its high 2.25MHz switching frequency allows the utilisation of tiny low cost capacitors and inductors less than 1mm in height.
Furthermore, the regulator is stable with ceramic capacitors, achieving very low output voltage ripple.
The LTC3552-1 is available from stock in a compact 3 x 5 x 0.75mm DFN-16 package.
Pricing starts at $2.30 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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