The HL7593 and HL7594 synchronous buck converters have output voltage ranges from 0.600V to 1.394V in 6.25mV steps or 0.27V to 0.6272V in 2.8125mV steps which are programmed through an I2C interface. They are designed to adjust output in application processors, memory, hard disk drives, solid disk drives and mobile devices.

Output voltages can be adjusted on the fly to provide a dynamic voltage scaling (DVS) function with a programmable slew rate. Output capacitors can be used to optimise Vout stability during load transients while inductors ranging from 0.33µH to 0.47µH may be used without affecting loop stability, said the company.

Pulse frequency modulation (PFM) is used to maintain conversion efficiency at moderate to light loads, with a typical non-switching quiescent current of 48µA, while maintaining load and line transient responses. At higher loads, the system automatically switches to fixed frequency pulse width modulation (PWM) at 2.4MHz for minimum Vout ripple and optimal load transient response. In shutdown mode, the supply current drops below 1µA to reduce power consumption. If required, the PFM mode can be disabled via the I2C registers.

The HL7593 and HL7594 ICs are available in a 15-bump, 0.4mm pitch, 2.01 x 1.21mm WLCSP.

The load transient performance of the synchronous buck converters provide high efficiency while operating at a fixed frequency, reducing the value of external components, hence, saving customers huge bill of materials (BoM) cost, commented Halo Microelectronics’ CEO David Nam.