Product category:
Power Supply ICs and Controllers
News Release from: Torex Semiconductor | Subject: XC9201/02 DC/DC convertor controller
Edited by the Electronicstalk Editorial
Team on 15 January 2001
In control of step-down DC/DC conversion
The new XC9201/02 is Torex Semiconductor's third-generation of DC/DC convertor controller.
The new XC9201/02 is Torex Semiconductor's third-generation of DC/DC convertor controller Employing the very latest current/voltage multiple feedback technique means that ceramic capacitors can be used to stabilise the XC9201/02's output rather than the tantalums required by most DC/DC controller ICs
This article was originally published on Electronicstalk on 30 Apr 2008 at 8.00am (UK)
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Torex Semiconductor is a world leader in power management ICs for portable and handheld equipment and the new XC9201/02 step-down DC/DC controller IC is suitable for a wide range of applications from mobile and cordless phones, palmtop computers and games consoles, to digital cameras and laptops.
Further reading
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With an input voltage range of 2.2 to 20V the new DC/DC controllers can be configured to produce stable power supplies with output currents up to 3A and output voltages between 1.2 and 16V, selectable in 0.1V steps to an accuracy of +/-2.5%.
Switching frequency can be set externally (using a resistor and capacitor) from 100 to 600kHz.
The higher maximum frequency together with the built-in current limit circuit, which limits the amount of current flowing through the external inductor, allows designers to safely use much smaller inductors than previously possible.
The device's clock synchronisation pin allows the switching frequency to be carefully matched to another frequency present within the design, thus reducing noise.
The gain controller pin can be used to set the device's transient response characteristic.
If the controller IC responds too quickly, unwanted noise can be generated.
By careful adjustment this noise is easily eliminated.
Both the XC9201 and XC9202 step-down DC/DC controllers achieve pulsewidth modulation via the multiple feedback signals of the devices' output voltage and coil current.
The XC9202 additionally is able to automatically switch to pulse frequency modulation under light load conditions, thus enabling it to maintain low ripple and high efficiencies over a wider load range.
Other notable features of the new devices include soft start, undervoltage lockout, and 'shutdown' where current consumption reduces to less than 0.5mA.
The XC9201/02 is available in an MSOP-8A package with an operating temperature range of -40 to +85C.
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