Key facts
- Brand
- Analog Devices
- Model
- ADP1821
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-05
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Analog Devices ADP1821 Step-Down DC-DC Controller Handbook
The ADP1821 is a versatile, synchronous PWM step‑down controller that operates from a 3.7 V‑5.5 V internal supply and accepts a wide input voltage range of 1 V to 24 V. It delivers output voltages as low as 0.6 V or up to 85 % of the input voltage, with selectable fixed switching frequencies of 300 kHz or 600 kHz and optional synchronization up to 1.2 MHz. Features include soft‑start, programmable current‑limit, power‑good output, and thermal shutdown.
The handbook covers the full product line, including a detailed specifications table, absolute maximum ratings, pin‑out descriptions, typical performance curves, theory of operation, and design recommendations such as component selection, PCB layout, and application circuits. Revision history and ordering information are also provided.
Analog Devices ADP1821 specifications
| Input voltage range (VCC) | 3.7 V – 5.5 V |
|---|---|
| Power‑stage supply voltage | 1 V – 24 V |
| Output voltage range | 0.6 V – 85 % of input |
| Switching frequency options | 300 kHz, 600 kHz, or sync 300 kHz‑1.2 MHz |
| Quiescent current (IVCC + I VCC) | 1 – 2 mA |
| Shutdown current (SHDN) | 10 µA |
| Operating temperature range (junction) | −40 °C – +125 °C |
| Maximum duty cycle (300 kHz) | 85 % (typical) |
Source: Analog Devices ADP1821 Step-Down DC-DC Controller Handbook
All Analog Devices ADP1821 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What is the shutdown current of the ADP1821?
The shutdown input draws only 10 µA when the device is off.
From: Analog Devices ADP1821 Step-Down DC-DC Controller Handbook
What protection features are built into the ADP1821?
It includes soft‑start, reverse‑current protection, programmable current‑limit, power‑good output, thermal shutdown, and undervoltage lockout.
From: Analog Devices ADP1821 Step-Down DC-DC Controller Handbook