New Product Express | Halo Microelectronics Launches Ultra-Low Power Consumption & Low Quiescent Current DC-DC HL7546A

September 28, 2025

In recent years, driven by the growing national awareness of sports and health, wearable devices represented by smartwatches and fitness trackers have gradually become one of the most concerned hot products among consumers. However, wearable devices require continuous power supply, and their battery life has become a key concern for consumers. Small battery capacity and high power consumption of components are among the main reasons for frequent charging. How to extend battery life and improve power efficiency has become an urgent issue to be solved in this industry.

As a leading domestic analog chip manufacturer, Halo Microelectronics Co., Ltd. (hereinafter referred to as "Halo Microelectronics") has launched HL7546A, a mature and high-efficiency DC-DC step-down conversion chip with ultra-low quiescent current. Featuring ultra-low power consumption and a compact package, this chip provides a more efficient and stable power management solution for wearable device applications. It reduces power consumption in standby mode, extends battery life, and effectively addresses power management challenges faced by wearable devices.

Product Overview

HL7546A has an input voltage range of 2.2V to 5.5V and an output current of up to 800mA. Even when the load current is as low as 1mA, it can still maintain an efficiency of over 92%. Meanwhile, HL7546A adopts internal compensation technology to ensure the stability of VOUT output and excellent dynamic response performance.

HL7546A offers two output voltage adjustment methods: I²C voltage adjustment and VSEL pin configuration adjustment, which can better adapt to different application scenarios. Specifically, HL7546AW03/04 can set the output voltage through the VSEL Pin, while HL7546AWL01/02/05 can adjust the voltage via I²C or VSEL.

HL7546A operates at a high frequency of 1.5MHz, which significantly reduces the ratings of required external components (capacitors, inductors). Under medium to light loads, the chip uses Pulse Frequency Modulation (PFM) to reduce the quiescent current of MOSFET switching, thereby maintaining high conversion efficiency. Even at extremely low quiescent current, HL7546A can still provide excellent load and input transient response capabilities. Under heavy loads, HL7546A automatically switches to the 1.5MHz fixed-frequency Pulse Width Modulation (PWM) operating mode to reduce output voltage ripple and optimize load transient response performance. In standby mode, the supply current drops to below 3uA, significantly reducing battery power consumption.

Product Advantages

1. Extend Battery Life: In standby mode, the supply current drops to below 3uA, which significantly reduces battery power consumption and extends battery life. This effectively solves the power management problems of wearable devices.

2. Small Chip Size : With a 1.54mm x 0.77mm WLCSP-8 package, it is an ideal choice for small-sized wearable devices. It not only meets the lightweight and portable requirements of wearable devices but also provides one of the better solutions for the industry.

Future Outlook

According to data from Acumen Research and Consulting, the market size of smartwatches and wearable devices is expected to reach $156 billion by 2030, indicating a broad market prospect for ultra-low power consumption power products. Halo Microelectronics has an independently developed proprietary DC-DC control architecture, which enables the synchronous step-down conversion chips provided by the company to have world-class load transient response performance—one of the key factors for the company to lead the wearable device industry.

About Halo Microelectronics
Halo Microelectronics(Stock Code: 688173) develops analog and power management integrated circuits enabling energy-efficient smart systems. Since 2012, Halo Microelectronics has been driving innovation in Mobile, IoT, and Automotive systems. Find out more at: http://www.halomicro.com.

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