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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →A power manager IC can charge a Li-ion or Li-polymer battery while also routing input power to the device, so the system can run without relying on the battery to absorb every change in load. For a USB-oriented, single-cell example, the LTC3557 family combines a charger, PowerPath management, input current limiting and regulator functions. It simplifies the number of separate blocks to coordinate, but the right part still depends on the battery, power source, system load and thermal design.
How a power manager charges the battery and powers the device
With a separate charger and system supply, the design must account for both battery charging and the load’s demand. A power manager combines charging with source selection and current management. Its PowerPath function directs available input power to the system and battery, while input current limiting helps keep the total draw within the source’s configured allowance.
The LTC3557 is an example designed for USB applications. According to Analog Devices’ LTC3557 product page, its input-current modes are 100mA or 500mA for USB, or 1A for a wall adapter. When the system load takes more of the permitted input current, the IC reduces battery charge current so system and charging demand together stay within the selected limit. The source’s allowance is therefore a shared budget, not a separate entitlement for the load and charger.
This arrangement can help the device remain powered while charging, without asking the cell alone to handle every load change. The LTC3557 family also integrates an ideal diode, internal protection features, three adjustable synchronous step-down regulators and a high-voltage buck-regulator output controller with Bat-Track for supplies up to 38V. Those features are specific to this family; they are not a guarantee that every power manager has the same functions.
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What the LTC3557 and LTC3557-1 offer
Both are intended for single-cell Li-ion or Li-polymer applications. The key variant difference is battery float voltage: the LTC3557 is specified for 4.2V, while the LTC3557-1 is specified for 4.1V. The LTC3557/LTC3557-1 datasheet also specifies a maximum charge current of 1.5A with thermal limiting, a 200mΩ internal ideal diode and optional external ideal-diode control.
These are part specifications, not recommended settings for every board or cell. Confirm the chosen variant’s float voltage against the battery manufacturer’s requirements, and review the programmed charge current, actual board thermals and application circuit against the datasheet. A maximum rating should not be treated as a default operating target.
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How the Linear Technology power manager options differ
“Power manager” covers devices with materially different cell-count ranges, conversion topologies and integration. The following distinctions are drawn from Analog Devices’ product documentation and are not a complete design review.
| Part | Documented role | Useful distinction |
|---|---|---|
| LTC3557 / LTC3557-1 | USB power manager and single-cell Li-ion/polymer charger with PowerPath and three buck regulators | Single-cell design; the LTC3557 and LTC3557-1 have 4.2V and 4.1V battery float voltages, respectively. See the product page and datasheet. |
| LTC3567 | USB power manager, single-cell charger, switching PowerPath and buck-boost converter | Distinguished by its USB/adapter current limits and integrated buck-boost rail. See the LTC3567 product page. |
| LTC3553 | Micropower USB power manager with single-cell charger, buck, LDO and pushbutton controller | The product page describes 100mA or 500mA input limits and automatic charge-current reduction. See the LTC3553 product page. |
| LTC3677-3 | Single-cell PMIC with charger, PowerPath, regulators and input overvoltage protection | The product page describes 100mA or 500mA supply modes and temperature-related battery-voltage reduction. See the LTC3677-3 product page. |
| LTC4085 | USB power manager with linear constant-current/constant-voltage charger and PowerPath | The product page describes the device; the DC937A demo page describes a 700mA, timer-terminated, temperature-qualified charger with 4.5V–5.5V input. Those demo-board details should not be generalized to every LTC4085 design. |
| LTC4162-L | Synchronous step-down charger with PowerPath and I2C telemetry | The Rev A datasheet specifies 1–8 Li-ion/polymer cells, 4.5V–35V input and up to 3.2A charge current. |
| LTC4020 | High-voltage buck-boost battery charger and power manager | Supports constant-current/constant-voltage, constant-current or lead-acid charging profiles; verify suitability for the intended chemistry and configuration. See the LTC4020 product page. |
The table shows why the family name alone is not enough to select an IC. A single-cell USB-oriented PMIC and a switching charger for a multicell pack solve different problems.
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How to choose a suitable part
- Match chemistry and cell count. Verify that the IC supports the exact battery chemistry and series-cell configuration. Do not infer multicell capability from a single-cell part.
- Check the input source. Compare the source voltage range and available current with the IC’s limits and the load’s needs. Account for input current shared between system operation and charging.
- Set a realistic charge requirement. Confirm the cell’s permitted charge voltage and current, then check that the desired charge rate is supported under the board’s actual operating and thermal conditions.
- Choose the conversion approach and rails. Determine whether a linear charger, step-down charger or buck-boost arrangement fits the input and battery voltages. Check which system rails are integrated and which require additional circuitry.
- Review load behavior and temperature features. Consider startup and peak loads, how much input headroom remains for charging, thermal limits, and any temperature qualification or charge-voltage adjustment the design needs.
- Decide whether monitoring or control is needed. Check for telemetry, interface and control features such as the LTC4162-L’s I2C telemetry if the system needs them.
- Validate the implementation. Use the exact part’s datasheet and reference circuit to check layout, thermal performance, protection requirements, package constraints and product lifecycle before committing to a design.
What integration does—and does not—simplify
Putting charging, PowerPath and selected regulator functions on one IC can reduce the number of separate functional blocks and the coordination they require. It does not remove the need to choose settings for the actual cell, manage PCB layout and heat, respect the input-current budget or verify protection and operating limits. The LTC3557 documentation describes the part’s behavior and ratings; it does not establish how a particular board will perform.
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