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Specification
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Input voltage: 1.5 V to 16 V
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Output voltage adjustable: 2 V to 12 V
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Frequency of operation: 1.5 MHz
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Maximum current: 300 mA
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Small dimensions: 17.8 x 10.1 x 3.8 mm
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Weight (without connectors): 1 g
Main features
The output voltage can be higher, lower or equal to the supply voltage.
The system can be set to automatically switch off at a preset voltage.
Adjustable output voltage from 2 V - 12 V.
Integrated temperature protection system.
Small dimensions: 17.8 x10.1 x 3.8 mm.
The large input voltage range and flexibility of the output voltage make the module very well suited as a stabilizer for battery-powered systems. It is easy to obtain the required voltage value, higher or lower than the power supply. For example, when 5V or 3.3V is required in a single Li-pol cell system (3.7V) during the entire battery life cycle.
Downloads
The module has four outputs:
- VIN - input voltage from 1.5 V - 16 V.
If the lower module does not switch on, the higher one can damage the system. - GND - ground potential
- VOUT - output voltage adjustable from
2V to 12V - SHDN - system shutdown - low state, which makes the system go into low power consumption state. The output is pulled to the VIN via a 10 kΩ resistor, which makes the system switched on by default.
The connectors are properly signed on the board.Outputs are 2.54 mm (popular goldpin connectors). The module can be plugged into a contact board , connected with wires or soldered into a dedicated PCB.
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On customer's request, we can deliver a chip with goldpin connectors soldered. For this purpose, please leave the information in the commentary to the order. |
Automatic shutdown
If the voltage on the SHDN output drops below 1.1V, the regulator will switch off automatically. The SHDN pin is pulled to VCC by a 130kOm resistor. By adding a pull-off resistor to the ground (GND), the threshold voltage at which the system will switch off can be adjusted. The resistor is calculated as follows:
Where VOFF is the voltage at which the controller is to switch off automatically.
Output voltage selection
The output voltage is set using a potentiometer. Turning clockwise increases the voltage.
Fig. 1: Selection of the output voltage.
The output voltage must not exceed twice the value of the set output voltage. For example, if the output voltage is set to 6V, the input must not exceed 12V.
System efficiency
Efficiency is defined as the ratio of input power to output power (Pout/Pin). This parameter is particularly important for battery operation when it is important to keep the system running as long as possible on a single charge. The efficiency of the inverter depends on the flowing current and the input voltage (graph below). On average, it is at the level of 70-80%, which allows to use practically maximum energy from the battery.
Fig.2: Efficiency for 3.3V output voltage.
Fig.3: Efficiency for 5V output voltage.
Fig. 4: Efficiency for output voltage 9V.
Fig. 5: Efficiency for output voltage 12V.
Voltage jumps (pins)
In electronic circuits the starting current may cause the occurrence of so-called pins, i.e. sudden voltage surges to a value above a set level. If the amplitude of the pins exceeds the permissible value of the regulator, it can be destroyed. Therefore, if the system is supplied with voltage above 10V or the load is high inductance, we recommend to solder a capacitor of 33uF/25V or higher as close to the circuit as possible between VIN and GND.
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