2nd-generation low-light energy harvesting IC that efficiently collects indoor or solar light, storing energy in storage elements. 200nA ultra-low quiescent current, 90%+ conversion efficiency, programmable dual-mode MPPT, enabling perpetual IoT power supply under indoor low-light conditions.
Param V1.0 ｜ Source LS6821_DS_V1.6 ｜ Review YEEMION Hardware Team ｜ 2026-07-15
Excerpt from LS6821 Datasheet V1.6
Typical operating current only 200nA, standby as low as 160nA. Ultra-low power ensures micro-energy isn't consumed by the IC itself — indoor 200 lux low light enables continuous power supply.
Advanced dual-mode maximum power point tracking (AMPPT) and fixed programmable MPPT (FMPPT), harvesting 15-30% more energy than traditional fixed MPPT, compatible with various PV cell specifications.
Dynamically configure MPPT parameters, charging strategy, watchdog, delay units, and lookup tables (LUT) via I2C interface — all parameters programmable for true on-demand customization.
Built-in programmable reset watchdog automatically resets the system under low light or abnormal conditions, ensuring long-term reliable IoT device operation — a feature most competitors lack.
Programmable lookup table (LUT) and delay unit resources meet various customized function requirements, enabling complex logic control without external MCU.
Supports VBUS USB charging and wake-up storage mode, allowing USB top-up in dark environments. Storage mode significantly reduces power consumption during shipping.
Supports dual battery/supercapacitor system with automatic voltage detection and switching between two power sources, switching time only 50µs (typical), ensuring uninterrupted power supply.
-40~85°C full temperature operation, ESD 2000V HBM protection, MSL1 moisture sensitivity, 100% factory tested, failure rate <10PPM, automotive AECQ100 certified.
LS6821 vs e-peas AEM10941 vs EM Micro EM8500 vs LS6820
300 lux supermarket lighting enables continuous power — no battery replacement, reducing maintenance costs
200nA standby current, indoor light sustains operation — no charging/battery replacement, perpetual runtime
Continuous operation in low-light without blind spots, watchdog ensures safety and reliability
Indoor/outdoor dual-scenario auto-switching, PV + supercapacitor solution, no wiring needed
Ultra-low power extends device lifecycle, storage mode reduces power during shipping
Programmable MPPT adapts to various PV specs, stable operation at -40~85°C
PV cell + LS6821 + storage + load system = complete battery-free power solution
PV cell connects to VSI pin, input voltage 1.5V~5.5V, supports 10µA~10mA input current, cold-start at 2V/10µA
MPPT tracks maximum power point + charge pump boost + CCCV constant current/voltage charging, 90%+ conversion efficiency
VBAT connects to Li battery or supercapacitor (1.8V~4.8V), supports dual-source auto-switching, programmable overcharge/overdischarge protection
VSYS output, max 100mA direct drive; >100mA via external MOS expansion, supports USB backup charging
We provide evaluation boards and complete design guides. Datasheets are available for download.