SUN4001 is a high-precision linear lithium battery charger control circuit, which is ideal for 4.2V single-cell lithium-ion or lithium polymer battery chargers. It features high voltage accuracy, pre-charge process, constant current charging, constant voltage charging, automatic recharging process, temperature monitoring, and dynamic battery internal resistance compensation.
The SUN4001 is a high‑accuracy linear lithium‑ion/ lithium‑polymer battery charger controller designed for low‑cost portable chargers. It integrates pre‑charge, constant‑current, constant‑voltage charging, temperature monitoring, battery‑impedance compensation and status indication in a compact SOP8/MSOP8 package.
The document provides functional descriptions, pin assignments, electrical limits, typical performance parameters and package dimensions, enabling designers to implement the controller in devices such as PDAs, mobile phones and handheld equipment. This manual is written in Chinese.
| Output voltage | 4.2 V |
|---|---|
| Re‑charge voltage | 4.075 V |
| Package | SOP‑8 |
| Supply voltage range (VCC) | 4.5 V – 12 V |
| Operating temperature | -40 °C to +85 °C |
| Maximum pre‑charge time | 10 – 20 min |
The controller provides a regulated output voltage of 4.2 V.
The pre‑charge current is set by an external resistor R9 connected to the CS1 pin.
Two indicator pins, LEDS and CS2/LEDT, drive red and green LEDs to show charging, fault, and end‑of‑charge conditions.
When VCC falls below the battery voltage, the device enters a low‑power Sleep mode with minimal leakage current.