Pulse high-frequency 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 of a wearable electronic product, the designer is faced with the difficult task of how to provide the circuit with a stable voltage when the battery is steadily discharged, and if it is necessary to use a microcontroller with a supply voltage of five volts, then a battery with a much higher voltage will be required and will have to put up with the low efficiency of the parametric stabilizer. There is only one output, it is necessary to use a voltage converter with a stable output voltage. A similar microcircuit MAX756 has been described more than once in the literature.
The author suggests that you familiarize yourself with another converter chip, which has an order of magnitude better ADP2504 parameters. The power supply voltage is 2,3-5,5 volts. The output voltage, depending on the modification, is 2,8-5 volts. QFN case size 3x3mm and height 1mm. The operating frequency is 2,5 MHz, which means the storage inductance is 1-1,5 mH. it can be applied. CHIP inductance size 2,5x2x1mm. The load current can reach 1 ampere, while the filter capacitance is 22,0, 2x1,25x1,25mm in size. The microcircuit has a pin for turning on / off the EN (6-pin) of the converter and the output voltage is reset, and the current consumption is about 1 μA. There is also a converter synchronization pin SYNC (7) to reduce the effect of interference on equipment.
Figure 1 shows a converter circuit that can be used in conjunction with a microcontroller. In this case, you can turn on / off the converter with one button SB1. The device works as follows. After connecting the battery, there is 6 volts at pin 1 due to the pull-up of the resistor R0, while the converter is in the micro-consumption mode.
Fig. 1
After pressing the SB1 button, the voltage from the battery passes through the resistor R4, the diode VD1 to pin 6 D1, the converter starts PWM pulses from pin 1 are smoothed by capacitance C3, filtered by the LC circuit L1C1 and fed to the microcontroller power outputs. From the port of the microcontroller, a logical unit is programmatically supplied to R2, and thus the converter continues to work after the button is released. When the SB1 button is pressed a second time, a logical unit appears on the ON_SB1 bus, which is fed to the input port of the microcontroller and the microcontroller programmatically removes a logical unit from the ON_5v bus, the converter turns off.
The device is assembled on a double-sided printed circuit board 13x15mm in size Fig. 2 The second side is completely covered with foil and is the ground and the screen. On the side of the tracks, 5 holes with a diameter of 0,5 mm were drilled to connect the tracks to the ground.
Fig. 2
This device uses an ADP2504ACPZ-5.0 chip, inductances L1, L2 - CPL2512T1R5M-TDK capacitors C2, C3 - size 1210-25-22.0-K-X5R-GRM-Murata, C1 - type 1206, resistors size 0402.
Author: Abramov. CM.
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