SLM3600
Silan SLM3600 single-cell Li-ion battery charger with automatic charge termination and thermal regulation for portable devices.
Product Overview
Description
The SLM3600 is a complete constant-current/constant-voltage linear charger for single-cell lithium-ion batteries.
Features automatic charge termination, thermal regulation, and programmable charge current up to 1A.
Integrated protection functions and small package make it ideal for portable electronics and wearable devices.
Product Series
SLM
Primary Application
Smartphones and tablets
Key Features
- Complete single-cell Li-ion charger
- Programmable charge current up to 1A
- Automatic charge termination
- Thermal regulation for safe charging
- Charge status indicator output
- Soft-start limits inrush current
- Reverse leakage current <1μA
Specifications
Applications
Smartphones and tablets
Electronic system design
Portable media players
Electronic system design
Wearable devices
Electronic system design
Bluetooth headsets
Electronic system design
Power banks
Electronic system design
FAE Expert Insights
"The SLM3600 is a reliable and cost-effective battery charger that I've used in numerous portable device designs. The programmable charge current allows flexibility - use a resistor to set anywhere from 100mA to 1A. The thermal regulation feature is particularly important - it automatically reduces charge current if the die temperature exceeds 120°C, preventing damage in thermally challenging environments. One smartphone project used the SLM3600 with a 680mA charge current, achieving full charge in about 2 hours for a 1200mAh battery. The charge status output is useful for driving an LED indicator. Reverse leakage current is very low at <1μA, minimizing battery drain when input power is removed. For best thermal performance, provide adequate copper area on the PCB for heat dissipation."
Reliable single-cell Li-ion charger with thermal regulation
— 刘建国, BeiLuo
Frequently Asked Questions
How do I set the charge current for SLM3600?
The SLM3600 charge current is programmed using a resistor connected between the PROG pin and ground. The formula is: ICHARGE = 1000 / RPROG (in mA when RPROG is in kΩ). For example: (1) 1kΩ resistor sets 1000mA (1A) charge current. (2) 2kΩ resistor sets 500mA charge current. (3) 10kΩ resistor sets 100mA charge current. The resistor should be 1% tolerance for accurate current setting. The actual charge current may be limited by thermal regulation if the IC temperature exceeds 120°C. For reliable operation, design for 20-30% margin below the programmed current to account for thermal limitations.
Use RPROG = 1000/ICHARGE; use 1% tolerance resistor for accuracy.
What protection features does SLM3600 include?
The SLM3600 includes comprehensive protection features for safe battery charging: (1) Thermal regulation - automatically reduces charge current if die temperature exceeds 120°C, preventing overheating. (2) Overvoltage protection - prevents charging if battery voltage exceeds safe limits. (3) Short circuit protection - limits current during output short conditions. (4) Reverse leakage protection - prevents battery discharge when input power is removed (<1μA leakage). (5) Soft-start - limits inrush current at the beginning of charge cycle. (6) Charge timeout - terminates charge if full charge is not achieved within a safe time window. These protections ensure safe and reliable charging under various fault conditions.
All protections are automatic; no external components needed for basic protection.