Halo adds buck converter for wearables
Tiny DC-DC consumes nano-amps in shutdown mode
Halo Microelectronics, a maker of analogue and power management chips, has added the HL7543 buck converter to its line-up. The devices is designed for wearables, fitness trackers, and smartwatches.
The HL7543 features an input voltage range between 2.3V to 5.5V delivering up to 600mA while maintaining over 90 percent efficiency at load current as low as 10µA. The company says its wide range of output capacitors can be used to optimise VOUT stability during load transients, and inductors of 2.2µH may be used without affecting loop stability.
The HL7543 operates at 1.2MHz. At moderate to light loads, the Pulse Frequency Modulation (PFM) is used to maintain conversion efficiency with non-switching quiescent currents. The system automatically switches to fixed-frequency Pulse Width Modulation (PWM) operation at 1.2MHz for minimum VOUT ripple and optimal load transient response at higher loads. In shutdown mode, the HL7543's supply current drops below 270nA.
The HL7543 comes in a compact 1.6mm x 0.9mm WLCSP-8 package.