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The WD5125C is a high efficiency, high output current buck-boost converter fully programmable through I2C. Depending on the input voltage, it can automatically operate in boost, buck or in a novel 4-cycle buck-boost mode when the input voltage is approximately equal to the output voltage. The transitions between modes happen at defined thresholds and avoid unwanted toggling within the modes to reduce output voltage ripple. Two registers, accessible through I2C, set the output voltage, and a VSEL pin selects which output voltage register is active. Thus the devices can support dynamic voltage scaling. If the output voltage register is changed during operation or the VSEL pin is toggled, the device transits in a defined, programmable ramp-rate. 

The WD5125C is available in a 2.2mm×1.3mm CSP-15L package. Standard products is Pb-Free and Halogen-Free. 

- System pre-regulator
- Point-of-load regulation
- Thermoelectric device supply
- Broadband network radio or SoC supply 


Input Voltage Range:
- 2.2V to 5.5V 

Output voltage range:
- 1.8 V to 5.2 V
- I2C-configurable during operation and shutdown
- VSEL pin to toggle between two output voltage presets 

Peak current mode buck-boost architecture:
- Defined transitions between buck, buck-boost and boost operation
- Forward and reverse current operation
- Start-up into pre-biased outputs 

Safety and robust operation features:
- Integrated soft start
- Overtemperature and overvoltage protection
- True load disconnect during shutdown
- Forward and backward current limit 

Pre-programmed output voltages (3.3 V, 3.45 V) 

High efficiency over entire load range:
- Low 13 μA operating quiescent current
- Automatic power save mode and forced PWM mode (I2C-configurable) 

Order Information
Ordering No. Vout(V) Package
WD5125C -15/TR N/A CSP-15L