Supported Models
- AP Ultra and S10 — up to 5W dynamic-decoding charging
- AP S7-S9 — up to 3.3W dynamic-decoding charging
- AP S1-S6 and SE — up to 2.5W dynamic-decoding charging
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Wireless Charging Solution Products
JX182 AP Watch 5W Fast Charging Solution
Model: JX182 / 9903B1-B2 Authentication Chip
An AP watch fast-charging reference design supporting up to 5W dynamic decoding, boost or buck input architectures, offline firmware upgrades and EMC-oriented hardware optimization.
9903B1/B2AP Watch 5WDynamic decodingEMC optimization
Technical Solution Display
This page presents technical specifications, performance, compatibility and applications. It is not an online retail listing.
Solution Overview
Performance, Advantages, Compatibility & Applications
Performance
- Up to 5W AP watch fast charging
- 800-900 mA input current
- 5V boost input or 5-12V buck input architecture
- 5.2 μH ±5% coil with Q factor ≥30
- 1.78 MHz compatible charging architecture
Advantages
- Compatibility solution for 1.78 MHz bridge-chip architectures
- Separate CBA board and coil product form helps reduce temperature rise
- EMC-oriented hardware optimization
- Stable, efficient charging with offline firmware upgrade support
- Fast PCB-and-coil overlay and Q-value detection
Applications
- 5W single-watch fast chargers
- 2-in-1 and 3-in-1 charging stations
- Magnetic power banks with watch charging
- Custom AP watch fast-charging products
Performance & Technical Features
- Supports AP Ultra and S10 at up to 5W with dynamic decoding
- Supports AP S7-S9 at up to 3.3W and AP S1-S6/SE at up to 2.5W
- Boost architecture accepts 5V input for single-watch products
- Buck architecture accepts 5-12V input for multi-device products
- Stable charging without pop-up messages, with offline firmware upgrades
- Optimized hardware architecture helps product designs pass EMC testing
Technical Specifications
| Authentication chip | 9903B1 / 9903B2 |
|---|---|
| AP Ultra / S10 output | 5W max, dynamic decoding |
| AP S7-S9 output | 3.3W max, dynamic decoding |
| AP S1-S6 / SE output | 2.5W max, dynamic decoding |
| Coil inductance | 5.2 μH ±5% |
| Coil Q factor | ≥30 |
| Magnet grade | 3600 GS |
| Spacer height | 0.8-1.2 mm |
| PCB | 4 layers, 0.8-1.0 mm thickness, immersion gold; inner 0.5 oz / outer 1 oz |
| Input current | 800-900 mA |
| Boost input | 5V via USB-A or USB-C; single-watch products |
| Buck input | 5-12V; multi-device products |
| Operating frequency | 1.78 MHz compatible architecture |
Engineering Reference
JX182 Full Solution Sheet
Open the solution sheet in a new window to inspect every parameter at full size.
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