Product description: PololD24V5F1 - step-down converter - 1.8 V 0.5 A
The DC-DC pulse controller converts the input voltage from3 V* to 36 Vinto an output value of1.8 V. It allows a current consumption of up to 0.5 A. The system has a high efficiency of 80 % - 93 %.
Pololu D24V5F1 - step-down converter - 1.8 V 0.5 A.
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We offer versions with output voltages:1,8V,2,5V,3,3V,5V,6V,9V,12Vand15V. |
Quotations
The module has four outputs:
- VIN- input voltage from 3 V to 36 V - depending on the drop-out voltage.
- GND- ground potential.
- VOUT- output voltage.
- SHDN- low state (below 0.4 V) switches the system into low power consumption mode, where it consumes only 10 uA - 20 uA for each Volt of the supply voltage. Pin is pulled to VIN by default through a 100 kΩ resistor. If the low-power mode is not usedSHDNcan be left unconnected.
You can solder the popular goldpin raster pinned outputs to 2.54 mm (the set is included). The module can be plugged into thecontactboard,connected with wiresor placedin a dedicated printed circuit board.
Efficiency and output current
Efficiency is defined as the ratio of output power to input power (Power out)/(Power in). This is a very important parameter when working with portable energy sources (batteries and accumulators), where the time of operation on one charging cycle counts. The efficiency dependence on the input voltage is shown in the graphs below.
Voltage drop-out
For versions with an output voltage of 1.8 V, the drop-out voltage is 1.2 V. This means that the input voltage must be at least 3 V to reach the catalogue output voltage.
Dangerous voltage pulses
When connecting the power supply to the module, dangerous, short, high amplitude eclectic impulses (so-called pins) may appear, which may permanently damage the system. Polol's tests show that for voltages above 20 V,the pinsmay have an amplitude exceeding 42 V. In order to protect against this undesirable phenomenon it is recommended to solder a capacitor of at least 33 uF / 50 V as close as possible to the pins supplying the inverter.
Specification
- Input voltage: 3 V* to 36 V
- Output voltage: 1,8 V
- Accuracy of output voltage: 4 %
- Maximum output current: 0,5 A
- Switching frequency: 500 kHz
- Built-in security:
- against excessive power consumption
- before too high a temperature
- Controller: ISL85415(documentation)
- Dimensions: 13 x 10 x 3 mm
- Weight: 5 g (without connectors)
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