Nano power DC-DC buck-converter for battery powered devices

Nano power DC-DC buck-converter for battery powered devices

New Products |
By Jean-Pierre Joosting

Halo Microelectronics has announced the launch of its latest addition to the buck converter product line, the HL7543, designed specifically for wearable devices and its high efficiency makes it an ideal choice for battery-powered devices.

The HL7543 features an input voltage range between 2.3-V to 5.5-V delivering high efficiency up to 600 mA while maintaining over 90% efficiency at load current as low as 10 μA. Its wide range of output capacitors can be used to optimize VOUT stability during load transients, and inductors of 2.2 μH may be used without affecting loop stability.

The HL7543 operates at a high frequency of 1.2 MHz, greatly reducing the value of the required external components. At moderate to light loads, Pulse Frequency Modulation (PFM) is used to maintain conversion efficiency with non-switching quiescent currents. The HL7543 maintains excellent load and line transient responses even with such a low quiescent current. The system automatically switches to fixed-frequency Pulse Width Modulation (PWM) operation at 1.2 MHz for minimum VOUT ripple and optimal load transient response at higher loads. In shutdown mode, the buck converter’s supply current drops below 270 nA, significantly reducing power consumption.

The HL7543 comes in a compact 1.6- x 0.9-mm WLCSP-8 package; the ideal choice for wearable devices with limited space. Primary applications include wearables, fitness trackers, and smartwatches.

“The smartwatch and the wearable market size is expected to grow $156 billion by 2030 (Source: Acumen Research and Consulting), and our proprietary synchronous buck converter with its excellent load and line transient responses, is one of the key reasons we are leading the wearables industry,” said David Nam, CEO of Halo Microelectronics.

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