The ADP2147 is a high efficiency, low quiescent current, step-down (buck) dc-to-dc regulator with an output voltage that can be switched between two different settings under control.
The ADP2147 is a step‑down (buck) DC‑DC regulator that operates from 2.3 V to 5.5 V input and delivers up to 800 mA output current. It features a simple dynamic voltage scaling (DVS) pin, internal synchronous rectifier, soft‑start, and protection functions such as over‑current, undervoltage lockout, and thermal shutdown. The device can be configured for two fixed output voltages and switches automatically between PWM and power‑save modes to maximize efficiency, reaching up to 95 %.
Typical applications include PDAs, wireless handsets, portable media players, digital cameras, GPS units, and low‑power medical equipment. The datasheet provides recommended external component values, PCB layout guidelines, thermal considerations, and an evaluation board schematic to help designers integrate the regulator efficiently.
| Input Voltage Range | 2.3 V – 5.5 V |
|---|---|
| Peak Efficiency | 95 % |
| Maximum Load Current | 800 mA |
| Shutdown Current | 0.2 µA typ. |
| Output Voltage Accuracy (PWM mode, VSEL Low) | −2 % to +2 % |
| Line Regulation | 0.25 %/V |
| Load Regulation | −0.95 %/A |
| Oscillator Frequency | 2.6 – 3.4 MHz |
| Startup Time | 250 µs |
| Thermal Shutdown Threshold | 150 °C |
| Thermal Shutdown Hysteresis | 20 °C |
The regulator accepts an input voltage from 2.3 V to 5.5 V.
The device can achieve up to 95 % efficiency.
Only three tiny external components are needed for the complete solution.
In shutdown, the regulator draws about 0.2 µA typical.