Switching voltage converter on the ADP2504 chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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When designing a circuit for a wearable electronic product, the designer is faced with a difficult task: how to provide the circuit with a stable voltage while steadily discharging the battery. And if you need to use a microcontroller with a supply voltage of 5 V, you will have to take a battery for a much higher voltage and put up with the low efficiency of the parametric stabilizer.
Another way out is to use a voltage converter with a stable output voltage. A similar microcircuit MAX756 has been described more than once in the literature. I suggest that you familiarize yourself with another converter chip - ADP2504, which has much better parameters.
The microcircuit is made in a miniature QFN package with dimensions of 3x3x1 mm. The supply voltage is 2,3 ... 5,5 V, the output voltage, depending on the modification, is 2,8 ... 5 V. The operating frequency of the converter is 2,5 MHz, i.e. a storage inductance of 1 ... 1,5 μH is required. An appropriate 2,5x2x1mm CHIP inductor and a 22uF filter capacitor 2x1,25x1,25mm can be used.
The maximum load current of the converter is 1 A.
The microcircuit has an enable input EN (pin 6). In the off state, the output voltage is reset to zero, and the current consumption is about 1 µA. There is also a SYNC sync pin for the converter to reduce interference with the equipment in which it operates.
Figure 1 shows a converter circuit that can be used in conjunction with a microcontroller. In this case, you can turn on the converter with one button SB1.
After connecting the GB1 battery, "6" is present at pin 1 of D1 due to the resistor R0, and the converter is in the micro-consumption mode. When the SB1 button is pressed, the voltage from the battery through the resistor R4 and the diode VD1 goes to pin 6 D1, the converter starts up; microcontroller.
From the port of the microcontroller (set by software), a logical "1" is applied to R2, and the converter continues to work after the button is released.
When the SB1 button is pressed again, a "1" appears on the ON_SB1 bus, which goes to the input port of the microcontroller, which programmatically removes "1" from the ON_5v bus, and the converter turns off.
The device is assembled on a double-sided printed circuit board with dimensions of 13x15 mm (Fig. 2).
The foil on the second side of the board is completely preserved and is the ground and the screen.
On the side of the tracks, 5 holes 0,5 mm were drilled to connect the tracks to the ground.
This device uses an ADP2504ACPZ-5.0 chip and CHIP elements: inductances L1, L2 - CPL2512T1R5M-TDK, capacitors C2, C3 - size 1210-25-22.0-K-X5R-GRM-Murata, C1 - size 1206, resistors - 0402 .
Author: S.Abramov, Orenburg
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