DC voltage converter KR1446PN1E. Reference data

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DC voltage converter KR1446PN1E. Reference data

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Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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The KR1446PN1E microcircuit is a switching step-up voltage regulator for powering low-voltage loads. It can be used as the main component of DC/DC converters in portable and stationary electronic devices for domestic and industrial use. DC / DC converters based on it have a high efficiency - up to 80%.

The microcircuit converts the input voltage of 0,9..5 V into one of the output voltages - 3,3 V or 5 V.

The load current of the microcircuit can reach 100 mA. It has an input voltage detector and a reference voltage source, which allows, respectively, to build an effective protection system into voltage converters based on it and obtain high stability of the output voltage.

The microcircuit is manufactured using CMOS technology in an 8-pin plastic DIP package type 2101.8c.

Table 1

Pin number	short name	Pin assignment
1	SHDN	A low logic signal at the input of the microcircuit turns it off and puts it into the minimum power consumption mode
2	3/5	Selecting the output voltage of the microcircuit Reference voltage source output.
3	REF	Connected through a capacitor to a common wire
4	LBO	Output (open drain) of the input voltage detector. Shorted to ground if LBI input drops below 1,25V
5	LBI	input voltage detector input
6	OUT	Feedback input and microcircuit power supply
7	GND	common wire
8	LX	Drain of a powerful key N-channel transistor

DC voltage converter KR1446PN1E. Reference data. Structural diagram of the microcircuit
Rice. 1. Structural diagram of the microcircuit

The output voltages of the microcircuit (3,3 or 5 V) are selected by electrically connecting its output 3/5 (pin 2), respectively, to the OUT pin (pin 6) or to the common GND wire (pin 7).

The block diagram of the microcircuit is shown in fig. 1, and the purpose of the conclusions is explained in Table. one.

Table 2

Parameter	Symbol	Parameter value	Parameter measurement conditions
Output voltage, V	Out	5 5,2 ... 3,3 3,45 ...	U_3/5 = 0B U_3/5=3 V
Minimum starting voltage, V	U_INL	0,9 1 ...	Without load
Minimum input voltage	UINL	0,9 1 ... 1,3-1,5	Without load I_O = 100 mA
Current consumption in the minimum power consumption mode, uA	I_INL	<20,4	U_shdn = 0 V U_3/5 U_OUT=3,5 V
Low level voltage at LBO output, V	U_LBO	<0,4	I_LBO = 3 mA
Leakage current at LBO output, uA	I_LBO	<1	U_LBO = 5 V
Low level at the inputs SHND and 3/5, V	U_SHNDL	<0,4	-
High level at the inputs SHND and 3/5, V	U_SHNDH	> 1,6	-
Threshold of operation of the input voltage detector, V	U_LBI	1,25	U_3/5 = 0 V

The main electrical characteristics are given in table. 2.

A variant of the practical circuit of the voltage converter on the chip KR1446PN1 (U_OUT = 5 V) is shown in fig. 2.

DC voltage converter KR1446PN1E. Reference data. Scheme of the voltage converter on the chip KR1446PN1
Rice. 2. Scheme of the voltage converter on the chip KR1446PN1

To the diagram in Fig. 2 it is necessary to make the following clarifications:

A Schottky diode is installed as VD1. The use of conventional rectifier diodes can lead to a decrease in the efficiency of the converter and an increase in the voltage U_INL.
When developing the printed circuit board of the converter, it should be taken into account that the length of the conductors from the inductor L1 and the diode VD1 to the output of the microcircuit 8 should be minimal.
It is not recommended to use a block for connecting to a microcircuit.
Inductor L1 must have a high quality factor and is wound with a wire with a diameter of at least 0,5 mm on a pin core.

Publication: cxem.net

See other articles Section Application of microcircuits.

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