ADP2138/ADP2139 are high efficiency, low quiescent current, synchronous step-down dc-to-dc converters. The ADP2139 has the additional feature of an internal synchronous rectifier, which enables 100% duty cycle low dropout operation.
The ADP2138 and ADP2139 are high‑efficiency, low‑quiescent‑current synchronous step‑down converters. They operate from 2.3 V to 5.5 V input and deliver up to 800 mA output in a 6‑ball wafer‑level chip‑scale package (WLCSP). Features include 95 % peak efficiency, 0.2 pA shutdown current, internal synchronous rectifier, and programmable PWM/PSM modes.
Typical applications include PDAs, wireless handsets, digital audio players, cameras and GPS units. The datasheet provides pin descriptions, recommended external components, thermal data, performance curves, evaluation‑board schematics and an ordering guide for multiple fixed output voltages.
| Input Voltage Range | 2.3 V – 5.5 V |
|---|---|
| Maximum Load Current | 800 mA |
| Peak Efficiency | 95 % |
| Typical Quiescent Current | 24 pA |
| Shutdown Current (typical) | 0.2 pA |
| Oscillator Frequency | 2.6 MHz – 3.4 MHz |
| Output Voltage Accuracy (PWM mode) | ±2 % |
The devices operate from 2.3 V to 5.5 V input.
They achieve a peak efficiency of about 95 %.
The shutdown current is ultralow, typically 0.2 pA.