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
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.
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.
Available in three frequency options (300 kHz, 600 kHz, and 1.0 MHz), 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, along with the PSM/forced pulse-width modulation (PWM) option, reduces the external part count and improves efficiency. The ADP1872 / ADP1873 operate over the –40°C to +125°C junction temperature range and are available in a 10-lead MSOP.
- Telecom and networking systems
- Mid to High End servers
- Set-top boxes
- DSP core power supplies
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
This describes the evaluation board hardware for the ADP1872/ADP1873 PWM buck controllers. The evaluation boards can be used to evaluate the ADP1872 or ADP1873 and application circuits using these ICs without requiring any additional software.
The ADP1872/ADP1873 evaluation boards employ a power input voltage (VIN) that ranges between 2.75 V and 20 V and a bias supply voltage (VDD) that ranges between 2.75 V and 5.5 V. Both inputs can be tied together for application input voltage conditions equal to or less than 5.5 V. The evaluation boards are available in two fixed-output voltage options (VOUT = 1.8 V and VOUT = 3.3 V), as well as in a 300 kHz, 600 kHz, or 1 MHz switching frequency (test trimmed in production). The ADP1872/ADP1873 evaluation boards offer an output accuracy of 2% over the full temperature range and provide a high input voltage (VIN ± 10%) and a full-scale load current up to 15 A.
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. 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. Both devices are available in a small, 10-lead MSOP package and can operate over the −40°C to +125°C temperature range.
Tools & Simulations
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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