ADP1872 Synchronous Current-Mode Buck Controller with Constant On-time and 0.6 V Reference Voltage
The ADP1872/ADP1873 are versatile current-mode, synchronous step-down controllers that provide superior transient response, optimal stability, and current limit protection by using a constant on-time, pseudo-fixed frequency with a programmable current-sense gain, current-control scheme. In addition, these devices offer optimum performance at low duty cycles by utilizing valley current-mode control architecture. This allows the ADP1872/ ADP1873 to drive all N-channel power stages to regulate output voltages as low as 0.6 V.
Applications
Telecom and networking systems
Mid to High End servers
Set-top boxes
DSP core power supplies
The ADP1873 is the power saving mode (PSM) version of the device and is capable of pulse skipping to maintain output regulation while achieving improved system efficiency at light loads (see the Power Saving Mode (PSM) Version (ADP1873) section for more information).
Available in three frequency options (300 kHz, 600 kHz, and 1.0 MHz, plus the PSM option), the ADP1872/ADP1873 are well suited for a wide range of applications. These ICs not only operate from a 2.75 V to 5.5 V bias supply, but also can accept a power input as high as 20 V.
In addition, an internally fixed soft start period is included to limit input in-rush current from the input supply during startup and to provide reverse current protection during soft start for a pre-charged output. The low-side current-sense, current-gain scheme and integration of a boost diode, along with the PSM/forced pulse-width modulation (PWM) option, reduce the external part count and improve efficiency.
The ADP1872/ADP1873 operate over the −40°C to +125°C junction temperature range and are available in a 10-lead MSOP.
Features and Benefits- Power input voltage as low as 2.75 V to 20 V
- Bias supply voltage range:
2.75 V to 5.5 V - Minimum output voltage: 0.6 V
- 0.6 V reference voltage with ±1.0% accuracy
- Supports all N-channel MOSFET power stages
- Available in 300 kHz, 600 KHz, and 1.0 MHz options
- No Current Sense Resistor Required
- Power saving mode (PSM) for light loads (ADP1873 only)
- Resistor-programmable current-sense gain
- Thermal overload protection
- Short-circuit protection
- See data sheet for additional features
| Design ToolsReference Designs |
Data Sheets
Application Notes
User Guides
Order Information
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|
| ADP1872ARMZ-0.3-R7 Last Time Buy | 10 ld MSOP | REEL 1000 | -40 to 125C | 0 | 1.03 | Y |
| ADP1872ARMZ-0.6-R7 Production | 10 ld MSOP | REEL 1000 | -40 to 125C | 0 | 1.03 | Y |
| ADP1872ARMZ-1.0-R7 Last Time Buy | 10 ld MSOP | REEL 1000 | -40 to 125C | 0 | 1.03 | Y |
Evaluation Boards
| Part Number | Description | Price | RoHS |
|---|
| ADP1872-0.3-EVALZ | Evaluation Board | 60 | Y |
| ADP1872-0.6-EVALZ | Evaluation Board | 60 | Y |
| ADP1872-1.0-EVALZ | Evaluation Board | 60 | Y |
Reference Materials
