I2C programmable 3A dynamic voltage scaling buck converters

Halo Microelectronics has released its HL7593 and HL7594 devices, a series of synchronous buck converters optimised to supply different subsystems of portable applications.

The series output voltage ranges from 0.6V to 1.394V in 6.25mV steps or 0.27V to 0.6272V in 2.8125mV steps programmed via an I2C interface. Their output voltages may be adjusted on the fly to provide a dynamic voltage scaling (DVS) function with a programmable slew rate. Moreover, a wide range of output capacitors can be employed to optimise VOUT stability during load transients, and inductors from 0.33µH to 0.47µH may be utilised without affecting loop stability.

At moderate to light loads, PFM is utilised to maintain conversion efficiency with a typical non-switching quiescent current of 48µA. Even with such a low quiescent current, the HL759x sustains outstanding load and line transient responses. At higher loads, the system automatically switches to fixed-frequency PWM operation at 2.4MHz for minimum VOUT ripple and optimal load transient response. In shutdown mode, the supply current drops under 1µA, decreasing power consumption. Also, the PFM Mode can be disabled if required through the I2C registers.

The ICs are available in a 15-bump, 0.4mm pitch, 2.01mm x 1.21mm WLCSP and are excellent for application processors, memory, HDD, SDD, and mobile devices.

“Our industry-leading load transient performance on these synchronous buck converters provide high efficiency while operating at a fixed frequency, reducing the value of external components, hence, saving customers huge BOM cost,” said David Nam, CEO of Halo Microelectronics.