Diodes Incorporated’s new AP72200 is a high-current synchronous buck/boost DC-DC converter with integrated high-side and low-side H-bridge MOSFETs. It delivers up to 97% efficiency with 1% voltage regulation accuracy, low quiescent current and very low output ripple.
The AP72200 employs proprietary buck/boost current-mode control technology to achieve excellent voltage regulation and a continuous output current of up to 2 A. The design allows for seamless transition between buck and boost operation while the wide 2,3 V to 5,5 V input voltage range provides flexibility of supply and produces between 2,6 V and 5,14 V output voltage.
The high level of integration, along with low quiescent current and wide input voltage range, make the device well suited for a wide range of portable applications including smartphones, tablets and other battery-operated consumer devices.
Many of the features of the AP72200 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 PWM or PFM mode, as well as in ultrasonic mode, which reduces the switching frequency to avoid the generation of sub-harmonic frequencies in the region of 20 kHz 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. The output voltage can be set to between 2,60 V and 5,14 V in 0,02 V increments by programming the device over I²C.
The integrated H-bridge MOSFETs feature extremely low RDS(ON) of 25 mΩ and a shutdown current of less than 1 μA. Quiescent current is as low as 20 μA when operating in non-switching mode and a typical of 29 μA in PFM mode. The switching frequency in continuous switching mode is typically 2,5 MHz, dropping to 27 kHz in ultrasonic mode.
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