XZ5001
800mA linear Li-ion battery charger with automatic recharge, thermal regulation, and comprehensive safety features
Product Overview
Description
The XZ5001 is a complete constant-current/constant-voltage linear charger for single-cell lithium-ion batteries. It delivers up to 800mA charge current with no external MOSFET or sense resistor required.
The device includes automatic recharge, preconditioning for deeply discharged cells, and comprehensive safety features including thermal regulation and battery temperature monitoring. Charge current is programmable via external resistor.
Available in compact SOT-23-5 and DFN-8 packages, the XZ5001 is ideal for smartphones, portable media players, and other handheld devices.
Product Series
XZ
Primary Application
Smartphones
Key Features
- Complete linear charger - no external MOSFET needed
- Up to 800mA programmable charge current
- ±1% charge voltage accuracy
- Automatic recharge
- Preconditioning for deeply discharged cells
- Thermal regulation for safe operation
- Battery temperature monitoring
- Charge status output
Specifications
| Input Voltage | 4.25V - 6.5V |
|---|---|
| Charge Current | Up to 800mA (programmable) |
| Battery Type | Single-cell Li-ion/Li-poly |
| Charge Voltage | 4.2V (±1% accuracy) |
| Trickle Charge Current | 100mA |
| Operating Temperature | -40°C to +85°C |
| Package | SOT-23-5, DFN-8 |
Applications
Smartphones
Electronic system design
Portable media players
Electronic system design
Digital cameras
Electronic system design
Handheld instruments
Electronic system design
Bluetooth headsets
Electronic system design
FAE Expert Insights
"The XZ5001 is a solid linear charger that I've used in many portable device designs. The integrated pass element eliminates the need for external MOSFETs, simplifying the design. The 800mA maximum charge current is sufficient for most small battery applications. I particularly like the thermal regulation feature - it automatically reduces charge current if the die temperature gets too high, preventing damage. The charge voltage accuracy of ±1% is good for maximizing battery capacity without overcharging. One tip: use the thermal regulation feature by ensuring good PCB heat sinking - this allows faster charging without overheating. The battery temperature monitoring is also important for safety - always use an NTC thermistor to disable charging at temperature extremes."
Reliable 800mA linear charger with integrated pass element and thermal regulation
— Kevin Wu, BeiLuo
Frequently Asked Questions
What is the maximum charge current of XZ5001?
XZ5001 supports charge currents up to 800mA, programmable via external resistor. The actual charge current is set by the resistor value connected to the PROG pin. Higher currents require better thermal management. For thermal-limited designs, the thermal regulation feature automatically reduces current to maintain safe temperature.
Set charge current based on battery capacity (typically 0.5C to 1C rate); ensure adequate thermal management for higher currents.
How do I set the charge current?
Charge current is set by a resistor connected between PROG pin and ground. The formula is: ICHARGE = 1000V / RPROG. For example, a 2kΩ resistor sets 500mA charge current. The resistor should be 1% tolerance for accurate current setting.
Calculate RPROG using formula; use 1% tolerance resistor for accuracy; verify thermal capability at selected current.
What safety features are included?
XZ5001 includes comprehensive safety features: thermal regulation to prevent overheating, battery temperature monitoring via NTC thermistor, preconditioning for deeply discharged cells, automatic recharge when battery voltage drops, and reverse leakage protection to prevent battery discharge when input is removed.
Use NTC thermistor for temperature monitoring; thermal regulation protects against overheating; all features are automatic.
What is the charge voltage accuracy?
XZ5001 provides ±1% charge voltage accuracy (4.158V to 4.242V). This precise regulation ensures maximum battery capacity is achieved without overcharging, which could damage the battery. The tight accuracy eliminates the need for factory calibration in most applications.
±1% accuracy is suitable for most Li-ion batteries; No calibration is needed; ensures safe and complete charging.
How does the automatic recharge feature work?
After charging completes, XZ5001 monitors battery voltage. If the voltage drops below approximately 4.05V (indicating self-discharge or load), the charger automatically restarts charging. This ensures the battery remains fully charged without manual intervention, important for devices that remain plugged in.
Automatic recharge maintains full battery; feature is automatic; important for devices left connected to charger.