Configurable DC/DC converter regulates with proprietary technology
Able to deliver up to 97 per cent efficiency with one per cent voltage regulation accuracy, the AP72200 is a high-current synchronous buck/boost DC/DC converter from Diodes. It has integrated high-side and low-side H-bridge MOSFETs and delivers low quiescent current, and very low output ripple, says the company.
The AP72200 employs Diodes’ proprietary buck/boost current-mode control technology to achieve voltage regulation and a continuous output current of up to 2.0A. The design allows for seamless transition between buck and boost operation while the wide 2.3 to 5.5V input voltage range provides flexibility of supply and produces between 2.6 to 5.14V output voltage.
The level of integration, along with low quiescent current and wide input voltage range, make the AP72200 suitable for portable applications including smartphones, tablets, and other battery-operated consumer devices, advises Diodes.
Many features are user-configurable through an industry-standard I2C interface, which can operate in standard mode, fast mode, fast-mode plus, and high-speed mode. This includes programmable-output voltage ramp-up and ramp-down slew-rates, output-active discharge, over-voltage protection threshold, and over-current threshold. The AP72200 can also be configured to operate in pulse width modulation (PWM) or pulse frequency modulation (PFM) mode. It also operates in ultrasonic mode, which reduces the switching frequency to avoid generating sub-harmonic frequencies in the region of 20kHz that can cause interference in the audible frequency range.
The buck/boost output can also be disabled using the I2C interface, allowing a master device to control the operation of the regulator across a standard I2C bus, reports Diodes. The output voltage can be set to between 2.6 and 5.14V in 0.02V increments by programming the device over I2C.
The integrated H-Bridge MOSFETs feature low RDS(on) of 25mOhm and a shutdown current of less than one micro A. Quiescent current is down to 20 microA when operating in non-switching mode and typically 29 microA in PFM mode. The switching frequency in continuous switching mode is typically 2.5MHz, dropping to 27kHz in ultrasonic mode.
The AP72200 is available in a 20-ball WLCSP package measuring 2.125 x 1.750mm.
