Voltage stabilizer on the ADP3301 chip. Scheme, description

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Voltage stabilizer on the ADP3301 chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power Supplies

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Popular linear integrated voltage regulators, for example, the 78Lxx, 78LRxx, 78Mxx series, at maximum output current, require that the input voltage be at least 1,5 ... 2,5 V more than the output. If a stabilizer with a lower voltage difference is required, microcircuits of the 78Rxx, L88Rxx, 1117-xxx series (0,2 ... 1,5 V) or the ADP3301-xx series (0,1 ... 0,2 V) can be used.

The basis of the stabilizer (Fig. 1) is the ADP3301AR-5 chip. She, like others from this series, is a linear voltage stabilizer. These microcircuits are produced in the SO-8 (SOIC-8) package and for several fixed output voltages: 2,7; 3; 3,2; 3,3 and 5 V. Maximum input voltage - 16 V, maximum power dissipation - 0,4 W, maximum output current - 0,1 A.

Voltage regulator on the ADP3301 chip
Rice. 1. Chip ADP3301AR-5

An important feature of the microcircuit is the presence of a control input (pin 5), by applying voltage to it, you can turn the stabilizer on and off. The lower limit of the turn-on and turn-off voltage is determined by the ratio of the resistance of resistors R1 and R2. For the resistances indicated in the diagram, the turn-on voltage is 4,85, and the turn-off voltage is 4,7 V. This function can be useful if the power is supplied from the battery. It will not allow you to avoid a deep discharge of the battery or incorrect operation of the device connected to the output of the stabilizer. Capacitors C1, C2, C3 ensure stable operation of the stabilizer.

On transistor VT1, zener diode VD2 and resistors R3, R4, a node is assembled that turns off the stabilizer at an increased input voltage. This feature will avoid overheating of the microcircuit and its damage. For the ratings indicated in the diagram, the stabilizer turns off at an input voltage of 12,2 V or more.

The VD1 diode together with the FU1 fusible link protects the stabilizer and the load connected to it from the wrong polarity of the supply voltage. If this situation is excluded, this diode can be omitted. Diodes VD3, VD4 protect the microcircuit if, for example, a charged capacitor or battery is connected to the output of the VD3 U1GU44 stabilizer. If the stabilizer is built into any device and this situation is excluded, these diodes can also not be installed. When the stabilizer is connected directly to the rectifier, the capacitance of the capacitor at its output must be such that the ripple of the rectified voltage does not exceed several tens of millivolts. You may need to install a 1uF capacitor C1000 for this.

In the manufactured copy of the stabilizer, the minimum input-output voltage was 123 mV (at a load current of 0,1 A), 30 mV (at a load current of 0,01 A) and 9 mV (at a load current of 1 mA). The stabilizer's own quiescent current consumption at an input voltage of 7,2 V is about 200 μA. The current consumption at an input voltage of 9 V was 4,7 mA, and at an input voltage of 19 V - 6,2 mA. Short circuit current - about 230 mA.

All elements (except for the fusible insert) are placed on a single-sided printed circuit board made of foil fiberglass with dimensions of 21x31 mm (Fig. 2, entrance - on the right). It was made to fit stock parts in less than five minutes without sketching and without pre-marking, using a hand mill with a tip diameter of 0,5 mm, rotating at a speed of about 10000 rpm. Printed conductors can also be cut with a cutter, having previously applied their pattern to the board. If the operating conditions are already known at the time of assembly of the device, the dimensions of the board can be reduced by eliminating protective diodes and using smaller capacitors.

Voltage regulator on the ADP3301 chip
Rice. 2. Elements and their placement on a single-sided printed circuit board

Diodes U1GU44 can be replaced by any of the series 1N400x, KD208, KD243, KD247. Replacing the Zener diode TZMC-11 - Zener diode BZV55C-11, 1N4741A, 2S211Ts. Instead of the BC547 transistor, any of the KT3130 series will do. If there are no restrictions on the mounting height, it is not necessary to use a miniature transistor, you can install a conventional one in the TO-92 (KT-26), TO-96S package, for example, from the KT3102, 2SC3311, 2SC2785, 2SC3199, SS9014 series. Capacitors C1, C3 are surface mount tantalum capacitors, note that most of them have a stripe indicating the positive terminal, unless explicitly stated otherwise. Capacitor C2 and resistors - for surface mounting of sizes 0805, 1206. For possible refinement of the device, two short-circuit jumpers (R2 and 00) for surface mounting are installed on the board (Fig. 0) (not shown in the diagram).

When the microcircuit is operating without a heat sink, the maximum dissipated power should not exceed 0,4 W. If a copper or brass U-shaped plate with an area of 3 ... 4 cm is installed on it using heat-conducting glue², the power will increase to 1W. Please note that, according to the author's experience, defective or expired (thickened) heat-conducting adhesive is often found on sale.

A selection of resistor R2 sets the minimum voltage at which the stabilizer should turn on. The lower the resistance of this resistor, the greater the voltage. The maximum turn-off voltage is set by selecting the resistor R4. By applying a microcircuit from this series with a different stabilization voltage, you can get a stabilizer for the required voltage.

Author: A. Butov

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