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The WD3120 is a high efficiency, peak current control mode DC-DC boost converter. It supports up to 1A output current with an integrated low RDS (ON) (130 m) N-channel MOSFET and cycle by cycle current limit protection. The device provides a USB 5V compliant power output from a single Li-ion battery.

The boost converter runs in Pulse-Width Modulation (PWM) mode, at 1 MHz fixed switching frequency to reduce output ripple, improve conversion efficiency. It allows for the use of small external components. At light load currents the converter enters Skipping Mode to maintain a high efficiency over a wide load current range. The build-in soft start circuitry minimizes the inrush current at start-up. Fixed 5V output and internal compensation network require only boost inductor, schottky diode, and input and output capacitors for WD3120, save PCB area.

The WD3120 is available in SOT-23-6L package. Standard product is Pb-free and Halogen-free.

- Mobile power pack
- Mobile phones
- Notebook computers
- Portable games


Input voltage range:

Continuous output current:

Switching frequency:
1 MHz (Typ.)

Up to 92%

Low RDS (ON) main switch:

Main switch current limit:
2.75A (Min.)

Fixed Output Voltage:

Output voltage accuracy:

Order Information
Ordering No. Vout(V) Package
WD3120E-6/TR N/A SOT-23-6L