Battery charger ICs

A battery charger ic sits between a power source and a rechargeable cell, and its job is to deliver charge without damaging either. Haiben supplies lithium battery charging ICs through our Weforsemi line, alongside the wider power management portfolio, for purchasing teams and hardware engineers specifying power sections in electronics manufacturing. This page explains what these ICs control, how they are selected, and where they fit in portable and IoT designs.

What a battery charger IC controls

A charger IC regulates the current and voltage delivered to a battery. It sets the charge rate, decides when to stop, and protects the cell from abuse. In a typical linear or switching charger, the device manages several functions in one package: current-limited constant-current (CC) charging, regulated constant-voltage (CV) charging, charge termination, and fault handling such as overcurrent, overtemperature and reverse-polarity conditions.

For the buyer, that integration replaces a cluster of discrete components and simplifies the bill of materials. For the engineer, it means the charge profile is set by the IC's feedback network and logic, and the datasheet is the reference for every value: input range, charge current, termination accuracy and thermal behaviour. Exact part numbers, input-voltage ranges and current ratings for our charger line are confirmed at quotation.

Because a charger is part of a larger power chain, it is usually specified with its neighbours in mind — see our power management ICs for the full catalogue structure, from LDOs and buck converters to LED drivers and OVP parts.

Lithium charging: the profile the IC enforces

Lithium cells are charged in stages. The IC begins with a preconditioning or trickle phase for a deeply discharged cell, then moves to constant-current charging at the programmed rate. As the cell voltage approaches its limit, the IC switches to constant voltage and holds it while current tapers. When the taper reaches the termination threshold, charging stops or restarts at a lower point.

Each stage carries requirements the IC must meet: charge current accuracy, voltage regulation tolerance, termination threshold and restart behaviour. The datasheet defines these; the engineer defines what the design needs. Charging above the specified voltage or current accelerates degradation and can create safety hazards, which is why the profile is treated as a hard constraint rather than a target. A charger with adjustable CC/CV settings lets the designer match the profile to the specific cell, and the tolerance figures in the datasheet remain the same.

Charging ICs in portable and IoT designs

Portable and IoT devices typically charge from USB or an adapter, and they care about three things: size, thermal behaviour and standby current. A linear charger is simple and low-noise but dissipates heat as the input-to-battery voltage difference grows; a switching charger is more efficient under wide input ranges but adds layout complexity and switching noise. The choice follows the input source and the enclosure, not marketing preference.

IoT designs add their own constraints: chargers may see intermittent input, the cell may sit unused for long periods, and quiescent current becomes relevant to battery life. Engineers often combine the charger with protection — see battery protection ICs below — and with DC-DC converters for the rails that follow. In our Weforsemi line, charging ICs sit alongside LDOs, boost and buck converters, backlight drivers and LED drivers, so the power section can be sourced from a single line where the requirements allow.

Specifying a charger IC, and the protection pairing

Specification starts from the input and the cell. The engineer should define: the input source and its voltage range, the battery chemistry and cell count, the maximum charge current, the required termination behaviour, the thermal budget, and the package and pin constraints for the board. These requirements narrow the charger line before any part number is discussed; the datasheet values are then confirmed against them.

• Input range and source type (USB, adapter, or both)
• Battery chemistry, cell count and target charge current
• Linear versus switching topology trade-offs
• Package size and thermal pad requirements
• Protection features and external components required

A charger is rarely alone on the protection side. Overvoltage protection at the input and cell-level protection are separate functions, and the Weforsemi line includes OVP ICs such as the VCP14C13P-A, a SOT23-3 overvoltage protection IC in the 1.3 A class, for input-side protection. Cell-side protection is covered by our battery protection ICs. Pairing the charger with both, where the design requires it, keeps fault handling at the right layer rather than relying on the charger alone.

For purchasing staff, the practical point is that the specification conversation and the quotation are the same step: requirements are stated, parts are proposed, and datasheet values are confirmed in writing before the order. That applies across the catalogue, from the Weforsemi charger and DC-DC lines to the OVP and three-terminal regulator categories.

Frequently asked questions

Are Haiben's charger ICs own-brand or third-party?

Our charger ICs are offered under the Weforsemi line, the company's own-brand semiconductor line operated by its wholly-owned subsidiary. Part numbers and datasheet values are confirmed at quotation.

Can you supply the charger and the protection IC together?

Yes. The Weforsemi line lists charging ICs alongside LDOs, boost and buck converters, backlight and LED drivers, and the broader catalogue includes OVP ICs and battery protection ICs. Exact combinations are confirmed against the design requirements.

How do I get the datasheet values for a charger IC?

State your input source, cell chemistry, target charge current and package constraints, and the relevant datasheet values — voltage ranges, current ratings, termination thresholds — will be confirmed at quotation.