Product details


Number of series cells 1 Charge current (Max) (A) 0.1 Operating Vin (Max) (V) 3 Cell chemistry Lead Acid, NiCd, NiMH, SuperCap Battery charge voltage (Min) (V) 2.5 Battery charge voltage (Max) (V) 5.25 Absolute Vin (safety rating) (Max) ((V)) 5.5 Control topology Switch-Mode Boost Control interface Standalone (RC-Settable) Features Input OVP, Solar input/MPPT Operating Vin (Min) (V) 0.6 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

VQFN (RGT) 16 9 mm² 3 x 3 open-in-new Find other Battery charger ICs


  • Ultra low-power with high-efficiency DC-DC boost converter/charger
    • Continuous energy harvesting from low-input sources: VIN ≥ 130 mV (Typical)
    • Ultra-low quiescent current: IQ < 330 nA (Typical)
    • Cold-start voltage: VIN ≥ 600 mV (typical)
  • Programmable dynamic maximum power point tracking (MPPT)
    • Integrated dynamic maximum power point tracking for optimal energy extraction from a variety of energy generation sources
    • Input voltage regulation prevents collapsing input source
  • Energy storage
    • Energy can be stored to rechargeable li-ion batteries, thin-film batteries, super-capacitors, or conventional capacitors
  • Battery charging and protection
    • User Programmable undervoltage and overvoltage levels
    • On-chip temperature sensor with programmable overtemperature shutoff
  • Battery status output
    • Battery good output pin
    • Programmable threshold and hysteresis
    • Warn attached microcontrollers of pending loss of power
    • Can be used to enable or disable system loads
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The BQ25504 device is the first of a new family of intelligent integrated energy harvesting nano-power management solutions that are well suited for meeting the special needs of ultra low power applications. The device is specifically designed to efficiently acquire and manage the microwatts (µW) to miliwatts (mW) of power generated from a variety of DC sources like photovoltaic (solar) or thermal electric generators. The BQ25504 is the first device of its kind to implement a highly efficient boost converter/charger targeted toward products and systems, such as wireless sensor networks (WSNs) which have stringent power and operational demands. The design of the BQ25504 starts with a DC-DC boost converter/charger that requires only microwatts of power to begin operating.

Once started, the boost converter/charger can effectively extract power from low-voltage output harvesters such as thermoelectric generators (TEGs) or single- or dual-cell solar panels. The boost converter can be started with VIN as low as 600 mV, and once started, can continue to harvest energy down to VIN = 130 mV.

The BQ25504 also implements a programmable maximum power point tracking sampling network to optimize the transfer of power into the device. Sampling the VIN_DC open-circuit voltage is programmed using external resistors, and held with an external capacitor (CREF).

For example solar cells that operate at maximum power point (MPP) of 80% of their open-circuit voltage, the resistor divider can be set to 80% of the VIN_DC voltage and the network will control the VIN_DC to operate near that sampled reference voltage. Alternatively, an external reference voltage can be provide by a MCU to produce a more complex MPPT algorithm.

The BQ25504 was designed with the flexibility to support a variety of energy storage elements. The availability of the sources from which harvesters extract their energy can often be sporadic or time-varying. Systems will typically need some type of energy storage element, such as a rechargeable battery, super capacitor, or conventional capacitor. The storage element ensures that constant power is available when needed for the systems. The storage element also allows the system to handle any peak currents that cannot directly come from the input source.

To prevent damage to a customer’s storage element, both maximum and minimum voltages are monitored against the user programmed undervoltage (UV) and overvoltage (OV) levels.

To further assist users in the strict management of their energy budgets, the BQ25504 toggles the battery good flag to signal an attached microprocessor when the voltage on an energy storage battery or capacitor has dropped below a preset critical level. This warning should trigger the shedding of load currents to prevent the system from entering an undervoltage condition. The OV, UV, and battery good thresholds are programmed independently.

All the capabilities of BQ25504 are packed into a small-footprint, 16-lead, 3-mm x 3-mm VQFN package.

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Technical documentation

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Type Title Date
* Data sheet BQ25504 Ultra Low-Power Boost Converter With Battery Management For Energy Harvester Applications datasheet (Rev. F) Nov. 13, 2019
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article Energy harvesting for smarter cities Apr. 28, 2015
Technical article The most popular battery charging solutions for wearables Apr. 20, 2015
More literature Battery Management Solutions for Wearable and Fitness Devices (Rev. C) Aug. 18, 2014
Application note Accurately measuring efficiency of ultralow-IQ devices Jan. 22, 2014
More literature Industry’s Most Efficient Nano Power Harvesting Solutions (Rev. A) Nov. 08, 2013
Application note Self-Powered Ambient Light Sensor Using bq25504 (Rev. A) Oct. 19, 2013
Application note Measuring Efficiency of the bq25504 Energy Harvesting Battery Charger Jul. 24, 2013
More literature Power Bank Charger ICs Feb. 25, 2013
Application note BQ25504 Optimization of MPPT algorithm Feb. 13, 2012
User guide Ultra Low Power Boost Converter Charger Energy Harvester (Rev. A) Oct. 20, 2011

Design & development

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Software development

SLUC462A.ZIP (29 KB)

Design tools & simulation


Reference designs

Energy Harvesting Reference Design Solution for Ultra Low Power Boost Converter IC
TIDA-00041 This reference design is an ultra low power boost converter for energy harvesting Applications. This solution is programmed from the factory for settings compatible with most MCU’s and 3V coin cell batteries. The design is programmed to deliver a 3.1VDC maximum voltage (OV) for charging the (...)
document-generic Schematic document-generic User guide

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