Fast Charging Protocol IC Selection Guide
Introduction
Selecting the right fast charging protocol IC is critical for the success of your charging product. This guide provides a systematic approach to choosing the optimal Injoinic solution for your application.
Key Selection Criteria
Protocol Support Requirements
The first step is identifying which fast charging protocols your product needs to support:
- USB Power Delivery (PD): Essential for laptops, tablets, and modern smartphones. Supports up to 100W+ with PPS for precise voltage control.
- Qualcomm Quick Charge (QC): Widely used in Android smartphones. QC 3.0 and 4.0+ provide backward compatibility and fast charging.
- Huawei SCP/FCP: Required for Huawei devices. SCP supports up to 40W+ charging.
- Samsung AFC: Used in Samsung Galaxy devices. Supports up to 25W.
- MediaTek PE: Found in phones using MediaTek processors.
For universal compatibility, select an IC supporting all major protocols like the IP2723T or IP2726.
Power Level Requirements
Determine your target output power:
- 5-18W: Suitable for smartphones and small tablets. Standard power bank range.
- 20-30W: Fast charging for large smartphones and tablets.
- 45-65W: Laptop charging and high-power devices.
- 100W+: High-performance laptops and multi-port chargers.
Ensure your power stage design can support the required output current with adequate thermal management.
Port Configuration
Consider your product's port requirements:
- Single Port: Simplest design, lowest cost. IP2723T is ideal.
- Dual Port: Requires intelligent power sharing. IP2726 provides dual-port control.
- Multi-Port: May require multiple ICs or more complex power management architecture.
Product Comparison
| Feature | IP2723T | IP2726 | IP2721 |
| Ports | Single | Dual | Single |
| Max Power | 100W | 100W (shared) | 18W |
| PD Version | 3.1 | 3.1 | 3.0 |
| PPS Support | Yes | Yes | No |
| Protocols | All major | All major | PD/QC |
| Package | QFN-24 | QFN-32 | SOP-8 |
Application-Specific Recommendations
Power Banks
For power bank applications, consider:
- Single-port power banks: IP2723T for universal compatibility up to 100W
- Dual-port power banks: IP2726 with intelligent power sharing
- Budget power banks: IP2721 for basic PD/QC support up to 18W
Pair with IP6538 buck-boost converter for single-cell battery applications.
Wall Chargers
For wall adapter applications:
- Single-port chargers: IP2723T with external power stage
- Multi-port chargers: IP2726 or multiple IP2723T with external power management
- High-density designs: Consider thermal management and efficiency optimization
Car Chargers
Automotive applications require:
- Wide input voltage range (9V-16V typical, load dump protection needed)
- Robust protection against automotive transients
- Temperature derating for high-temperature environments
IP2723T is suitable with proper input protection and thermal design.
Design Considerations
PCB Layout
Proper layout is critical for reliable operation:
Thermal Management
Consider thermal design early:
- Calculate maximum power dissipation
- Design adequate heat sinking
- Consider ambient temperature and enclosure
- Implement temperature monitoring if needed
Conclusion
Selecting the right fast charging IC requires careful consideration of protocol requirements, power levels, and application constraints. Injoinic's product portfolio offers solutions for virtually any application, from simple chargers to complex multi-port systems.
Contact LiTong's FAE team for personalized recommendations based on your specific requirements.
💡 FAE Insights
⚠️ Common Pitfalls
- ✗ Inadequate CC line routing causing protocol detection failures
- ✗ Undersized power path components leading to excessive heating
- ✗ Insufficient protocol support limiting device compatibility
- ✗ Poor thermal design causing derating under load
- ✗ Inadequate input protection for the application environment
📋 Customer Cases
Electronics Startup
Consumer Electronics
Challenge
The customer was developing their first power bank product and was overwhelmed by the various fast charging protocols and IC options. They needed guidance on selecting the right solution for a dual-port 30W power bank targeting the mid-range market.
Solution
We recommended the IP2726 dual-port controller paired with a high-efficiency buck-boost converter. Our FAE team provided detailed guidance on protocol selection, schematic design, and layout optimization. We also provided reference designs and sample code.
Results
- Successfully launched product with 30W dual-port output
- Achieved compatibility with 95% of tested devices
- Passed all safety certifications on first attempt
- Product achieved 4.3-star rating on major platforms
- Customer placed follow-on orders for additional models
Frequently Asked Questions
1. How do I choose between IP2723T and IP2726?
Choose IP2723T for single-port applications where you need a compact, cost-effective solution. Select IP2726 for dual-port designs requiring intelligent power sharing between ports. The IP2726 integrates power allocation logic that would otherwise require external components and complex firmware when using two single-port ICs.
2. What is the difference between PD 3.0 and PD 3.1?
PD 3.1 extends the power range up to 240W (48V/5A) compared to PD 3.0's 100W (20V/5A) limit. PD 3.1 also introduces Extended Power Range (EPR) with new voltage levels (28V, 36V, 48V). For most consumer applications, PD 3.0's 100W is sufficient. PD 3.1 is primarily for high-power applications like gaming laptops and professional equipment. Both versions support PPS (Programmable Power Supply) for precise voltage control.
3. Do I need to support all fast charging protocols?
Supporting all protocols provides maximum device compatibility but increases cost and complexity. For many applications, supporting PD and QC covers 80-90% of devices. Consider your target market - if targeting Huawei or Samsung users, add SCP or AFC support. For premium universal products, support all major protocols. For cost-sensitive products, PD-only may be sufficient for the premium segment.
4. What power level should I target for my application?
Power level selection depends on your target devices: 18W covers most smartphones with basic fast charging; 30W provides faster charging for large phones and small tablets; 45-65W supports tablets and laptops; 100W+ is for high-performance laptops. Consider your product positioning - premium products should offer higher power, while budget products can target lower power levels. Also consider thermal constraints - higher power requires better thermal management.
5. How important is PPS (Programmable Power Supply) support?
PPS is increasingly important for newer smartphones from Samsung, Google, and others. It allows precise voltage adjustment (20mV steps) for optimal charging efficiency and battery health. PPS can provide faster charging with less heat generation compared to fixed voltage levels. For premium products targeting flagship phones, PPS support is highly recommended. For basic products, it may be optional depending on target market.
6. What thermal considerations are important for protocol ICs?
Protocol ICs themselves typically have low power dissipation, but the overall system thermal design is critical. The power path components (MOSFETs) generate most heat. Ensure adequate copper area for heat spreading, consider thermal vias to inner layers, and design for worst-case continuous operation. High ambient temperatures (like in car chargers) require additional thermal margin. Monitor temperature during testing and implement derating if necessary.