Product category: Power Supply ICs and Controllers
News Release from: Fairchild Semiconductor | Subject: FAN5660
Edited by the Electronicstalk Editorial Team on 23 September 2002
Inductorless convertor cuts
power system parts
A new inductorless 100mA DC/DC convertor from Fairchild features greater than 90% efficiency, making it ideally suitable for portable and system voltage conversions
A new inductorless 100mA DC/DC convertor features greater than 90% efficiency, making it ideally suitable for portable and system voltage conversions. Achieving over 90% efficiency at full load with a typical operating current of just 120uA, the FAN5660 is one of the best-performing products of this type.
This article was originally published on Electronicstalk on 23 September 2002 at 8.00am (UK)
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Using only two low-cost capacitors, the charge-pump's 100mA output replaces switching regulators, eliminating inductors and their associated cost, size and EMI.
The FAN5660 inverts a +1.5 to +5.5V input to a corresponding -1.5 to -5.5V output.
Also, this new DC/DC convertor can split or double a full load, +5.0V input voltage, of a power supply or battery, providing +2.25V in splitter mode and +9.5V in doubler mode.
"The introduction of the FAN5660 supports our power management strategy of offering highly efficient power conversion solutions to our customers", said Tivadar Szabo, Manager of Ultra Portable Products in Fairchild's Power Management Group.
"The FAN5660, with its high conversion efficiency at full load, optimises battery life in portable and handheld applications".
Equipped with an onboard oscillator circuit, the FAN5660 charge pump allows flexibility in selecting appropriate operating frequencies.
The oscillator can operate at either low or high frequencies.
When selecting the low, 5kHz operating frequency, a very low quiescent current will result.
A smaller capacitor can be used at the higher, 50kHz operating frequency.
The FAN5660 can operate in three modes: inverter, splitter or doubler.
As an inverter, it converts the input voltage in a range of 1.5 to 5.5V to a corresponding negative value.
In voltage splitter mode it splits the input voltage in half, and in voltage doubler mode, it doubles the input voltage.
Because the FAN5660 does not require an external diode in voltage doubler mode, it occupies less PCB area in designs.
The FAN5660 is provided in the space-saving 8-lead SOIC package.
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