XZ3102
Compact 2A buck converter with 3MHz switching frequency for ultra-small solution size
Product Overview
Description
The XZ3102 is an ultra-high frequency synchronous buck converter designed for space-constrained applications. With a switching frequency of 3MHz, it enables the use of tiny chip inductors as small as 1.0mm x 1.0mm, minimizing overall solution size.
Operating from a 2.3V to 5.5V input, the XZ3102 delivers up to 2A output current with excellent efficiency across the load range. The device features automatic power-save mode for high efficiency at light loads, seamlessly transitioning to PWM mode for heavy loads.
Advanced features include programmable soft-start, input undervoltage lockout, thermal shutdown, and short-circuit protection. The XZ3102 is available in an ultra-small 1.5mm x 1.5mm WLCSP package, making it ideal for wearable devices and ultra-compact electronics.
Product Series
XZ
Primary Application
Wearable devices
Key Features
- Ultra-high 3MHz switching frequency
- Tiny 1.5mm x 1.5mm WLCSP package
- 2A output current in compact form factor
- Automatic power-save mode for light load efficiency
- Programmable soft-start time
- Input UVLO protection
- Thermal shutdown and short-circuit protection
Specifications
| Input Voltage | 2.3V - 5.5V |
|---|---|
| Output Voltage | 0.6V - Vin |
| Output Current | 2A |
| Switching Frequency | 3MHz |
| Efficiency | Up to 94% |
| Operating Temperature | -40°C to +85°C |
| Package | WLCSP-6 (1.5mm x 1.5mm) |
Applications
Wearable devices
Electronic system design
Smart watches
Electronic system design
Hearing aids
Electronic system design
IoT sensors
Sensor signal conditioning
Ultra-compact electronics
Electronic system design
FAE Expert Insights
"The XZ3102 is perfect for wearable applications where every fraction of a millimeter counts. The 3MHz frequency allows use of 0402-size inductors, and the WLCSP package is incredibly small. I've used this in smartwatch designs where PCB area is extremely limited. The automatic power-save mode works well - efficiency stays above 85% even at very light loads, which is critical for battery life. The trade-off is slightly lower peak efficiency compared to lower-frequency converters, but for wearables, the size savings are worth it. One tip: the WLCSP package requires careful PCB design - follow the layout guidelines closely for proper solder joint reliability. Also, the higher switching frequency means more attention to input capacitor placement to minimize EMI."
Ultra-compact 2A converter with 3MHz frequency for wearable designs
— Sarah Liu, BeiLuo
Frequently Asked Questions
What makes XZ3102 suitable for wearable applications?
XZ3102 features an ultra-small 1.5mm x 1.5mm WLCSP package and 3MHz switching frequency that enables tiny external components. The automatic power-save mode maintains high efficiency at light loads typical of wearable devices. Low quiescent current (<20μA) minimizes battery drain during standby.
Use XZ3102 for space-constrained wearable designs; consider XZ2105 for higher current requirements.
What inductor size can be used with XZ3102?
At 3MHz switching frequency, XZ3102 can use chip inductors as small as 0402 (1.0mm x 1.0mm) with values of 0.47μH to 1.0μH. This enables the smallest possible solution size for space-constrained applications.
Use 0.47μH chip inductor for smallest size; verify inductor saturation current rating exceeds maximum load current.
How does the power-save mode work?
XZ3102 automatically enters power-save mode at light loads, operating in PFM (pulse frequency modulation) to minimize switching losses. As load increases, it seamlessly transitions to PWM mode for full-frequency operation. This maintains high efficiency across the entire load range.
Power-save mode is automatic; no external configuration needed. Light load efficiency is optimized for battery-powered applications.
What PCB layout considerations are important for XZ3102?
Due to the high switching frequency and small package, careful PCB layout is essential. Keep input capacitor close to VIN and GND pins, minimize the switching node (SW) trace length, and provide adequate ground plane. Follow the evaluation board layout as a reference.
Use 4-layer PCB if possible for better EMI performance; follow manufacturer layout guidelines closely.
Can XZ3102 be used in multi-rail power systems?
Yes, XZ3102 can be synchronized to an external clock for multi-rail systems requiring precise switching frequency alignment. This prevents beat frequencies and simplifies EMI filtering in systems with multiple switching regulators.
Use SYNC feature for multi-rail systems; connect all converters to common clock source for frequency synchronization.