5V, 500mA Step-Down Voltage Regulator D24V5F5
The D24V5Fx family of buck (step-down) voltage regulators generates lower output voltages from input voltages as high as 36V. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) and have a typical efficiency between 80% to 93%, which is much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large. These regulators have a power-save mode that activates at light loads and a low quiescent (no load) current draw, which make them well suited for low-power applications that are run from a battery.
The different versions of this regulator all look very similar, so the bottom silkscreen includes a blank space where you can add your own distinguishing marks or labels. This product page applies to all eight versions of the D24V5Fx family.
The regulators feature short-circuit/over-current protection, and thermal shutdown helps prevent damage from overheating. The boards do not have reverse-voltage protection.
Features
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Input voltage:
- 3V to 36V for output voltages of 1.8V and 2.5V
- [outputvoltage+dropoutvoltage] to 36V for output voltages of 3.3V and higher (see below for more information on dropout voltage)
- Fixed 1.8V, 2.5V, 3.3V, 5V, 6V, 9V, 12V, or 15V output (depending on regulator version) with 4% accuracy
- Maximum output current: 500mA
- Typical efficiency of 80% to 93%
- 500 kHz switching frequency (when not in power-save mode)
- 200μA typical no-load quiescent current
- Integrated over-temperature and over-current shutoff
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Small size: 0.5″×0.4″×0.1″ (13mm×10mm×3mm)
Using the regulator
Connections
The buck regulator has four connections: shutdown (SHDN), input voltage (VIN), ground (GND), and output voltage (VOUT).
The SHDN pin can be driven low (under 0.4V) to turn off the output and put the board into a low-power state. There is a 100kΩ pull-up resistor between the SHDN pin and VIN, so if you want to leave the board permanently enabled, the SHDN pin can be left disconnected. While the SHDN pin is being driven low, the current draw of the regulator is dominated by the current through the pull-up resistor and will be proportional to the input voltage. (At 36V in it will draw about 360 μA.)
The input voltage, VIN, powers the regulator. Voltages between 3V and 36V can be applied to VIN, but for versions of the regulator that have an output voltage higher than 3V, the effective lower limit of VIN is VOUT plus the regulator’s dropout voltage, which varies approximately linearly with the load (see below for graphs of dropout voltages as a function of the load). Additionally, please be wary of destructive LC spikes (see below for more information).
The output voltage, VOUT, is fixed and depends on the regulator version: the D24V5F1 version outputs 1.5V, D24V5F2 version outputs 2.5V, the D24V5F3 version outputs 3.3V, the D24V5F5 version outputs 5V, the D24V5F6 version outputs 6V, the D24V5F9 version outputs 9V, the D24V5F12 version outputs 12V, and the D24V5F15 version outputs 15V