IP3005
Cost-effective single-cell lithium battery protection IC with over-charge, over-discharge, and over-current protectio...
Product Overview
Description
The IP3005 is a single-cell lithium battery protection IC providing essential safety functions.
It monitors battery voltage and current, disconnecting the battery during fault conditions.
The compact SOT23-6 package and minimal external components make it ideal for space-constrained designs.
Product Series
IP
Primary Application
Smartphones and tablets
Key Features
- Over-charge protection with automatic recovery
- Over-discharge protection with low standby current
- Over-current and short-circuit protection
- Low RDS(on) internal MOSFETs
- Ultra-low standby power consumption
- Minimal external components
- Compact SOT23-6 package
- RoHS compliant
Specifications
| Cell Count | Single cell (1S) |
|---|---|
| Over-charge Voltage | 4.25V to 4.35V (typical) |
| Over-discharge Voltage | 2.30V to 2.50V (typical) |
| Over-current Threshold | 2A to 5A (configurable) |
| Standby Current | < 1μA |
| Package | SOT23-6 |
| Operating Temperature | -40°C to +85°C |
Applications
Smartphones and tablets
Electronic system design
Power banks
Electronic system design
TWS earphones
Electronic system design
Portable electronics
Electronic system design
IoT devices
Electronic system design
FAE Expert Insights
"The IP3005 is my standard recommendation for single-cell battery protection. It's cost-effective, reliable, and the SOT23-6 package fits almost anywhere. I've used this in countless designs from power banks to wearables. The protection thresholds are well-calibrated for lithium cells. The low standby current is crucial for battery life. For basic protection needs, this IC offers excellent value. It's a drop-in replacement for many popular protection ICs with better cost."
Compact and cost-effective single-cell protection
— Tom Li, BeiLuo
Frequently Asked Questions
How does the IP3005 protection circuit work?
IP3005 continuously monitors battery voltage and current. If voltage exceeds the over-charge threshold during charging, the IC disconnects the charge path. If voltage drops below the over-discharge threshold, it disconnects the discharge path. For over-current conditions, the IC detects excessive current flow and opens the discharge path. All protections have hysteresis to prevent oscillation.
Protection is automatic. No external control needed. The IC protects the battery in all fault conditions.
What happens after a protection event?
After over-charge protection, normal operation resumes when voltage drops below the release threshold (typically by connecting a load). After over-discharge protection, charging resumes when a charger is connected and voltage rises above the release threshold. Over-current protection typically latches and requires removing the load or charger to reset.
Most protections auto-recover when fault is removed. Check datasheet for specific recovery conditions.
Can IP3005 be used with high-capacity battery cells?
Yes, IP3005 works with any capacity single-cell lithium battery. The protection thresholds are voltage-based, not capacity-dependent. For high-capacity cells (5000mAh+), ensure the over-current threshold is set appropriately for your application's maximum current draw. The current sense resistor may need adjustment for very high current applications.
IP3005 works with all capacities. Adjust current protection for high-current applications.
What external components are needed with IP3005?
IP3005 requires minimal external components: a current sense resistor for over-current detection, decoupling capacitors on power pins, and optionally a delay capacitor for timing adjustments. The internal MOSFETs eliminate the need for external switching components. This minimal BOM reduces cost and PCB space.
Minimal external components needed. Follow reference schematic in datasheet.
How do I select the current sense resistor?
Calculate sense resistor using R = Vdetection / Itrip, where Vdetection is the over-current detection voltage (typically 100-200mV) and Itrip is your desired protection current. For example, for 3A protection with 150mV detection: R = 0.15V / 3A = 50mΩ. Ensure resistor power rating exceeds I²R losses (3A² × 0.05Ω = 0.45W, use 1W resistor).
Calculate based on desired trip current. Use adequate power rating. Contact us for calculation assistance.
Does IP3005 include temperature protection?
The IP3005 focuses on voltage and current protection. For temperature protection, add an external NTC thermistor and monitoring circuit, or select a protection IC with integrated temperature monitoring. Some applications may use the battery pack's existing temperature protection instead.
Add external temperature monitoring if needed. Contact us for temperature protection solutions.