The MAX8600/MAX8601 single-/dual-input linear battery chargers safely charge single-cell Li+ batteries. The charging rate is optimized to accommodate the thermal characteristics of a given application. There is no need to reduce the maximum charge current or worst-case charger power dissipation. Charging is optimized for Li+ cells using a control algorithm that includes low-battery precharging, voltage and current-limited fast-charging, and top-off charging, while continuously monitoring the battery for overvoltage, over/undertemperature, and charging time. The charger timeout protection is programmable. The charger status is indicated by three open-drain outputs. The MAX8601 automatically selects between either a USB or AC adapter input source. The AC adapter charge current is programmable, while USB charge current is set not to exceed either 100mA or 500mA, depending on the USEL input. The MAX8600 is a single-input charger with no USB source input. The MAX8600/MAX8601 are available in the tiny 3mm x 3mm power-enhanced TDFN package.
The MAX8600 (single‑input) and MAX8601 (dual‑input) are linear chargers for single‑cell Li⁺ batteries. They provide programmable fast‑charge up to 1 A, USB charge‑current selection of 100 mA or 500 mA, and thermal‑limit control that reduces current above 100 °C. The devices monitor battery voltage, temperature, and over‑voltage conditions, and indicate status via open‑drain CHG, FLT and POK outputs.
Both ICs are offered in a 3 mm × 3 mm TDFN package with an exposed pad for heat dissipation. Pin functions include battery connection (BAT), charge‑current programming (SETI), thermistor input (THM), timing capacitor (CT), enable (EN), and status outputs. The MAX8601 can select between a DC source (4.5‑7 V) and a USB source, with the USB current limited by the USEL pin.
| Input Voltage Range (DC) | 4.5 V to 7 V |
|---|---|
| USB Charge Current Options | 100 mA or 500 mA |
| Fast‑Charge Current (Programmable) | Up to 1 A |
| Package Type | 3 mm × 3 mm TDFN with exposed pad |
| Operating Temperature Range | –40 °C to +85 °C |
| Charge‑Current Programming Resistor Formula | RSETI = 1500 / ICHARGE_MAX (Ω) |
The MAX8601 can be powered from a DC source (4.5 V‑7 V) or from a USB port, with USB current selectable via the USEL pin.
Charge current is programmed with an external resistor (RSETI) connected to the SETI pin; the relationship is RSETI = 1500 / ICHARGE_MAX.