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Power-path management controls how energy flows from an external supply to a product’s system load and rechargeable battery. It lets a device run while charging, allocates limited input power between the load and battery, and can call on the battery when the system briefly needs more power than the source can provide. The exact behavior—including whether the system starts with a missing or deeply discharged battery—depends on the charger IC and its specified operating conditions.
The three power domains
External source
│
▼
Charger IC ─────► System load
│
▼
Battery
This is a conceptual diagram, not a promise that every IC uses the same internal topology. A practical device may combine input protection, current limiting, a charger power stage, battery regulation, a system-output path, reverse-current blocking, thermal regulation, and battery-temperature monitoring. Some designs use a linear pass element; others use a switching converter or integrate the charger and several system regulators in a PMIC.
The three domains have related but distinct jobs:
| Function | Primary responsibility |
|---|---|
| Battery charger | Applies the supported charging algorithm and regulates battery current and voltage. |
| Power path | Routes and prioritizes energy among the input, system load, and battery. |
| Battery protection | Protects the cell or pack against conditions such as overcharge, over-discharge, overcurrent, and short circuit. |
| Fuel gauge | Estimates battery state of charge, remaining capacity, and condition. |
| PMIC | May combine charging and power-path control with regulators, sequencing, and monitoring. |
A charger advertised with power-path management is not automatically a complete battery-management system. Check the chosen part’s datasheet for protection, monitoring, and fuel-gauging functions rather than assuming they are included. See Microchip’s charger IC overview and the TI BQ24272 product page.
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Why a basic charger connection can cause trouble
In a simple arrangement, the charger is connected to the battery and the product load is connected to the battery or the same charger output. The load varies independently of battery charging. If the charger cannot distinguish system consumption from battery current, a continuous load can interfere with charge-current regulation or make termination unreliable. A changing load can also pull down the system rail when an input is inserted or removed. A weak USB port, adapter, or cable may sag when asked to supply the system and charger together.
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A controlled power path addresses these problems by managing input power for the system and battery separately enough for the particular architecture to prioritize, limit, or supplement the paths. That can help the charger make a more reliable termination decision, but it does not guarantee that the battery will charge at its nominal rate while the product is running. TI describes power-path devices that reduce charge current when the system’s demand approaches the available input limit; see the BQ24074 and BQ24272.
What happens in common operating conditions?
- Input present, light system load: The source powers the system; available remaining capacity can go to the battery, subject to the IC’s charge-current settings and thermal limits.
- Input present, rising load: As the system consumes more of the source budget, the IC may reduce battery charge current or otherwise regulate the input or system path. Dynamic power-path management (DPPM) is one term used for this kind of adjustment. Exact priorities and thresholds are device-specific; see the BQ24232HA datasheet.
- System peak exceeds source capability: Some power-path designs let the battery supplement the input so the system can handle a short peak. This is a controlled function, not unlimited backup: the IC, battery, protection circuit, interconnects, and thermal conditions all constrain the available current. TI describes this benefit on the BQ24272 product page.
- Input removed: The battery may take over the system path. Whether the rail stays within the downstream electronics’ limits depends on the IC’s switching and reverse-blocking behavior, output capacitance, battery impedance, layout, and load step. Do not assume a zero-glitch handoff without checking specifications and testing the design.
- Battery deeply discharged or absent: Some parts regulate a minimum system voltage or support startup without a usable battery; others do not. TI documents a 3.5 V minimum system-voltage behavior under specified conditions for the BQ24272. Treat absent-battery startup as a specific feature to verify, not a universal property.
- Battery full while the system runs: The system may continue to use input power while the charger enters its post-charge behavior. Verify the device’s termination, recharge, timer, and load-sensing behavior with the real system attached.
- Weak source or cable: Input dynamic power management (DPM), VINDPM, or input-current limiting can reduce charger demand to help prevent input collapse. These features cannot make an undersized source provide more power, and they do not by themselves implement USB-C or USB Power Delivery negotiation.
Terms that matter
- Load sharing: A broad description of allocating available input power between system operation and battery charging. Microchip uses “system load sharing” in its MCP73871 design guide and AN1149.
- Power path / PowerPath: Controlled routing of input and battery power to the system. The term does not specify one universal circuit or handoff behavior.
- Dynamic power-path management (DPPM): A method that adjusts charging demand and/or system-path operation as input availability and system load change. TI uses DPPM terminology in the BQ24232HA documentation.
- Input DPM / VINDPM: Input regulation that reduces charger demand when the source voltage reaches a threshold, helping avoid excessive input droop. See the BQ24074 and BQ24232HA.
- NVDC: Narrow-voltage-DC power path, commonly a battery-near system rail with a controlled minimum system voltage. It is not necessarily a fixed 5 V or 3.3 V rail; downstream regulation may still be needed. TI lists NVDC power-path management for the BQ25630.
- Ideal-diode or FET-based path: A low-loss way to select or combine sources while limiting reverse current and voltage drop. Not every power-path IC implements the same ideal-diode arrangement.
Architectures and their trade-offs
| Architecture | Typical fit | Main advantage | Main limitation |
|---|---|---|---|
| Linear charger with integrated power path | Low-to-moderate power and a simple portable product | Few external components and low switching noise | Voltage dropped from input to battery becomes heat; thermal limits can reduce usable charging current. |
| Switch-mode buck charger with power path | Higher charge current or input voltage substantially above battery voltage | Often more efficient and less dissipative than a linear approach in those conditions | Needs an inductor and careful layout; switching noise, EMI, and transient response require attention. |
| Dynamic power path / DPM | Variable-capability USB or adapter sources | Can adjust charger demand to preserve input regulation as load changes | Charging can slow or stop when system demand consumes the source budget. |
| NVDC path | Systems that can use a battery-near rail with a controlled minimum voltage | Supports battery operation with a defined system-voltage floor | May require downstream conversion for fixed system rails. |
| PMIC-integrated charger and power path | Products needing multiple rails and sequencing as well as charging | Combines several power functions | Configuration and validation are more involved; can be excessive for a simple charger-only need. |
| External FET/load-sharing circuit | An existing stand-alone charger must be retained, or custom path behavior is needed | Flexible implementation around the selected charger | Designer must validate handoff, reverse-current behavior, and protection in the external circuit. |
| Buck-boost system path | Wide input or battery range with a regulated rail requirement | Can regulate across input and battery voltage variation | More switching complexity, cost, and layout demands; verify the actual IC topology and ratings. |
For examples of linear and switch-mode power-path products, see TI’s BQ24074, BQ24232HA, and BQ24272. The TPS65070 illustrates a broader PMIC approach, combining a single-cell charger and power path with three step-down converters and two LDOs. Microchip’s MCP73871 design guide covers an integrated USB/AC charger with power-path management. Its MCP7383X reference design shows external load sharing around a stand-alone charger controller.
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Choosing a charger or power-management IC
Start from the system’s power and battery requirements, not the biggest charge-current number in a product table. The following questions narrow the architecture and the parts worth evaluating.
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| Decision | What to establish |
|---|---|
| Battery chemistry and cell count | Confirm the exact chemistry, series-cell count, charge-voltage accuracy, precharge and termination behavior, and any required temperature control. Do not infer one model’s chemistry support from a vendor’s whole family. For example, compare the single-cell Li-ion/Li-polymer BQ24272 with the BQ25185 documentation for supported Li-ion or LiFePO₄ profiles. |
| System-rail needs | Decide whether the load can use a battery-tracking rail, needs a minimum rail, or requires a fixed voltage. Account for path drop, battery variation, handoff transient, and downstream converter UVLO. An NVDC or battery-near rail may suit a downstream regulator but is not itself a fixed 5 V or 3.3 V supply. |
| Input source | Specify source type, voltage range, current capability, cable and connector limits, allowable droop, and hot-plug/inrush conditions. For USB-C, determine who handles port configuration and power negotiation; a charger with a USB input is not automatically a complete USB-C PD solution. |
| Current budget | Calculate separately the maximum battery charge current, average system current, peak system current, and maximum current available from the source. The source may have to supply system demand and charging at once; when it cannot, the IC may reduce charge current. |
| Conversion topology | Choose linear for simplicity and modest power when thermal dissipation is acceptable; consider switching where efficiency or usable power favors it. Compare under the actual input voltage, battery voltage, current, thermal, and noise conditions. |
| Startup and battery states | Check behavior with a fully discharged battery, no battery, prebias, minimum system voltage, input-current limits at startup, inrush, and power-good signaling. These are part-specific features. |
| Safety and monitoring | Check NTC input, JEITA profiles where needed, hot/cold inhibit, thermal regulation, input overvoltage protection, short-circuit/overcurrent behavior, safety timers, precharge, and recharge thresholds. |
| Implementation and lifecycle | Review interface and firmware needs, package and thermal performance, external component count, PCB constraints, qualification needs, lifecycle status, and the current datasheet and reference design. |
Specific product specifications make useful architectural examples, not a ranking. TI lists the BQ24074 as an active single-cell linear charger with power path, 1.5 A class charge capability, 4.2 V regulation, 10.5 V input overvoltage protection, and VINDPM. The BQ24232HA is a single-cell linear part with a maximum 0.5 A charge current and input DPM. The BQ24272 is a single-cell switch-mode charger with up to 2.5 A charge current, I²C control, JEITA temperature monitoring, and power-path features. The BQ25630 is a buck charger whose product page lists a 3.9 V to 18 V input range and NVDC power path. These figures are not directly comparable measures of performance: topology, thermal conditions, source capacity, battery voltage, system load, and component selection all affect what a design can actually deliver.
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Design pitfalls to avoid
- Confusing “runs while charging” with “charges at full rate while running.” A system may remain on while the charger reduces battery current. Full-rate charging at maximum load and correct termination are separate conditions to demonstrate.
- Ignoring charge termination under load. Confirm how the IC senses battery current and whether system consumption is excluded or accounted for. Validate termination with the real load connected, not only a battery simulator or unloaded board.
- Assuming DPM guarantees USB compliance. DPM can limit demand or respond to source droop; it does not replace USB-C port configuration, PD negotiation, role management, ESD protection, or every required overvoltage and source-selection function.
- Assuming battery supplement is unlimited. Check battery discharge rating, protection thresholds, IC FET/switch limits, inductor saturation current, system-path current rating, thermal limits, and resistance in the battery, connector, and PCB path.
- Assuming a battery is isolated from the load or that handoff is seamless. Architectures differ. Check FET orientation, reverse blocking, path drop, capacitance, control-loop response, and downstream undervoltage limits; test insertion, removal, and load steps.
- Overlooking linear-charger heat. A large input-to-battery voltage difference at substantial current can make the pass element dissipate significant power. Verify thermal performance at worst-case ambient, layout, and load; do not rely on nominal charge current alone.
- Omitting protection or temperature sensing. A power path does not by itself establish that the cell or pack has all required protection. Verify the complete battery safety architecture and thermistor behavior.
- Skipping layout validation. Follow the selected device’s datasheet and reference layout for high-current loops, ground and thermal-pad connection, capacitor placement, inductor choice, copper area, and thermal vias. These rules are not interchangeable across ICs.
Hardware validation checklist
Before committing a design, test it under the source, battery, and load conditions it is expected to encounter:
- Measure system-rail voltage with the input present and absent.
- Apply maximum continuous system load while charging, then apply the expected peak load step at minimum input voltage.
- Remove and reapply the adapter while the product is operating; observe rail droop, reset behavior, and input transients with an oscilloscope.
- Test a weak-source or high-resistance-cable condition and confirm input current and voltage remain within source, connector, and IC limits.
- Where supported and safe, test startup with a deeply discharged battery and without a battery.
- Verify charge termination with the actual system load connected and check recharge and timer behavior.
- Test valid, hot, cold, open, and short thermistor conditions as applicable to the IC.
- Run to thermal steady state and check for repeated thermal regulation or unexpected current reduction.
- Check reverse current from battery toward the input when the adapter is absent, and verify downstream regulator behavior through transitions.
- Confirm the PCB layout and component ratings against the selected IC’s current datasheet and reference design.
Exact voltage thresholds, current limits, timer behavior, thermal limits, and startup requirements are part-specific. Use the chosen part’s current datasheet as the controlling source for production decisions; product summaries are useful for screening, not a substitute for design limits. See the BQ24232HA datasheet and Microchip’s MCP7383X reference design.
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Practical decision guide
- Choose an integrated linear power path when power is modest, simplicity and low switching noise matter, and worst-case heat is manageable.
- Choose a switch-mode charger with power path when the input-to-battery voltage difference or required power makes linear dissipation unattractive, and the design can accommodate switching components and layout work.
- Choose NVDC when a battery-near system rail and controlled minimum voltage suit the downstream electronics, with additional regulation as needed.
- Choose a PMIC when the product also needs multiple regulated rails, sequencing, or integrated monitoring.
- Choose an external load-sharing circuit when retaining a stand-alone charger or tailoring unusual source behavior justifies the added responsibility for handoff, reverse current, and validation.
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