Synchronous Current-Mode Buck Controller with Constant On-time and 0.6 V Reference Voltage
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.Applications
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.
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.
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