Compact and efficient power management in a single chip

Epson’s Power Management IC for Hearing aids integrates all the necessary power management functions into a single chip, contributing to space-saving designs.
With Epson’s unique kHz wireless charging technology, it enables stable, contactless power transmission. The product lineup includes three variants, each catering to different needs and applications, supporting the convenience, performance, and comfort of hearing aids for users.


PMIC

4key Features of Epson PMIC

  1. Stable wireless charging

    • Epson's unique kHz-band wireless charging technology provides stable, contactless power transmission to hearing aids.

  2. High-efficiency buck charge pump for DSP

    • Equipped with a highly efficient t x1/2 buck charge pump circuit for DSP, boasting a conversion efficiency of over 90%(>2mA). This eliminates the need for additional power ICs for DSP.

  3. Comprehensive protection features

    • Includes protection circuits for overcharge/discharge, overcurrent, and overvoltage, ensuring reliable battery protection.

  4. Flexible charging parameter settings

    • The built-in Flash ROM allows customizable charging parameters tailored to the battery, contributing to extended battery life.

Product Lineup

  • PMIC specialized fo contact charging

    S1A00114B(for Hearing aid)

    Specialized for Contact charging with multi-function.
    Small chip size saves PCB space.
    S1A00114B Brief Sheet PDF

    S1A00115B(for Hearing aid)

    		 A model that achieves low cost and space-saving while providing the necessary functions for power management in contact charging.
    S1A00115B Brief Sheet PDF

  • PMIC compatible with wireless charging

    S1A00112B(For Hearing aid) S1A00121F(For Charger)

    Compatible with wireless charging and contact charging. High efficiency and low power consumption. Multi-functional 1-chip power management IC. Ensures stable power transmission even with small coils. Achieves an efficient charging solution by combining the S1A00121F (Primary IC) and S1A00112B (Secondary IC).
    S1A00112B Brief Sheet PDF
    S1A00121F Brief Sheet PDF

Function Comparison Chart

  • For Hearing Aid

    Function Category

    Function Sub-Category

    		 Hearing Aids
    (Wireless charge)    		 Hearing Aids
    （Contact charge）
    Wearable

    Wireless power reception

    Rectification
    Regulator
    Load modulation

    		 S1A00112B
    MP
    		- -

    Charging

    		 Li-ion battery S1A00114B
    MP
    		S1A00115B
    MP

    Power supply

    		 DCDC charge pump
    Protection Charging/Discharging

    Others

    DSP Communication function
    Motion/ Hall Sensor function
    7bit detector for monitoring battery capacity

  • For Charger

    Function Category

    Function Sub-Category

    		 Hearing Aids
    (Wireless charge)

    Wireless power transmission

    0.1W power transmission
    Automatic switching of coil drive mode (Half /Full bridge)

    		 S1A00121F
    MP

    Communication

    		 Load modulation

    Protection：Safety circuit

    		 Temp monitoring /VCC monitoring /PMOS short detection

    Others

    Removal /landing detection