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200mA boost converter supports 2.7V to 5V output

Posted: 16 Oct 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Ams? converter? mobile phone? lithium-ion? capacitor?

Ams AG has announced what it describes as an ultra-compact switching boost converter that offers high efficiency and helps extend run-time in applications powered by a single-cell lithium-ion battery. The AS1383 is available with an adjustable output voltage, or a factory-programmed fixed output voltage.

The AS1383 provides outputs between 2.7V and 5V from a 2.7V to 5.5V input voltage range. Depending on the input voltage, it can provide a maximum output current of up to 200mA. The converter implements peak current-mode PWM control for accurate line and load regulation, and features internal NMOS and PMOS power switches with very low on-resistance and gate charge. This helps the converter to reach high efficiency, peaking at 92 per cent, across the range from moderate to full loads, Ams said.

In addition, it offers a 'Powersave' mode in which all circuitry except that required to monitor the output voltage is turned off when the output current falls below the point at which the energy supplied in the switch's minimum on-time is greater than the energy consumed by the load. This Powersave mode keeps power consumption down to a typical 25?A when supplying light loads.

AS1383

Operating at a high fixed switching frequency of 3.5MHz, the AS1383 requires only a small input and output capacitor and an inductor rated at just 1?H. Two additional components, external resistors for setting the output voltage, are required only in the adjustable-output version of the device.

The converter itself is a six-pin wafer-level chip-scale package, with a footprint of just 1.2mm x 0.8mm and a pitch of 0.4mm. This means that an AS1383-based circuit is small enough to fit in the latest sleek designs for consumer products such as wristbands, media players, digital cameras and mobile phones.

The fixed switching frequency used by the AS1383, and integrated anti-ringing control implemented in the device, help system designers to realize low-noise end product designs. At 20mV peak-to-peak for a 150mA load, output voltage ripple is also low enough to avoid interfering with sensitive downstream signals.

The AS1383 is available in production volumes. Unit pricing is $0.25 in order quantities of 1,000 units.





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