The ADP2109 is a high efficiency, low quiescent current step-down DC-DC converter with an internal discharge switch function. It features peak efficiency, fixed frequency operation, and low quiescent current.
The ADP2109 is a compact 600 mA step‑down converter in a 5‑ball WLCSP package, designed for portable applications such as PDAs, wireless handsets, digital audio players, cameras and GPS units. It operates from 2.3 V to 5.5 V input and provides fixed output voltages of 1.0 V, 1.2 V, 1.5 V and 1.8 V.
Key features include 95 % peak efficiency, 18 pA typical quiescent current, internal discharge switch, synchronous rectifier, soft‑start, current‑limit and thermal‑shutdown protection. The device requires only three external components and offers a power‑save mode that reduces switching frequency under light load.
| Peak efficiency | 95 % |
|---|---|
| Maximum load current | 600 mA |
| Typical quiescent current | 18 pA |
| Shutdown supply current | 0.2 pA |
| Input voltage range | 2.3 V to 5.5 V |
| SW on‑resistance (PFET) | 320 mΩ |
| Current limit (PFET peak) | 1100 mA min / 1300 mA typ / 1500 mA max |
| Thermal shutdown threshold | 150 °C |
| Operating ambient temperature range | -40 °C to +85 °C |
The ADP2109 achieves a peak efficiency of 95 %.
Its typical quiescent current is 18 pA.
It operates from 2.3 V to 5.5 V input.
The shutdown supply current is 0.2 pA.