Dual voltage switches KR1184KN1, KR1184KN2, KB1184KN1-4. KB1184KN2-4 for USB interface. Reference data

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Dual voltage switches KR1184KN1, KR1184KN2, KB1184KN1-4. KB1184KN2-4 for USB interface. Reference data

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Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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The chips are a dual voltage switch designed for Universal Serial Interface (USB) systems. The chips are used in USB interface power management circuits, power supply redundancy, and chargers. The foreign analogue of these microcircuits is MIC2526-X. The switches meet the following USB interface requirements: each channel provides switching current up to 500 mA; low resistance of internal keys in the open state; The fault current is limited to 1,2A, with a low level at the FLGB pin indicating a fault in the output purpose (short circuit or thermal overload). The microcircuits provide thermal overload protection to prevent failure of the switch due to current overload and shutdown when the input voltage level drops into an unacceptable level. The chip's enable inputs are compatible with TTL and CMOS logic levels.

The KR1184KN1 microcircuit is turned on at a high level at the EN A/B pins, and KR1184KN2 at a low level. The block diagram of the microcircuit is shown in Fig. 1, and the location of the pins is in Fig. 2. The microcircuits consist of the following components: a charge pump circuit (supplies power to the driver circuit and provides voltages at the gate of the MOSFET above the source level); generator; thermal protection unit (turns off the power switch when the crystal temperature reaches 150°C); blocking unit when the input voltage decreases; power switch gate driver; reference voltage source; current limit circuit; voltage switch (CMOS transistor).

Dual voltage switches KR1184KN1, KR1184KN2, KB1184KN1-4. KB1184KN2-4 for USB interface. Reference data. Chip block diagram
Rice. 1. Block diagram of the microcircuit

Execution of microcircuits: package type 2101.8-1 (weight - no more than 1 g) and unpackaged version.

Dual voltage switches KR1184KN1, KR1184KN2, KB1184KN1-4. KB1184KN2-4 for USB interface. Reference data. IC pinout
Rice. 2. The location of the pins of the microcircuit

Pin assignment

1,4 - logically compatible inputs to enable channels A and B;
2, 3 - outputs of the error flag signals of channels A and B;
5,8 - outputs of the switch channels A and B;
6 - common;
7 - power input.

Electrical parameters

Input voltage, V	3 5,5 ...
Threshold voltage of permission input KR1184KN1, V: inclusion	> 2,4
Shutdown	<0,8
Threshold voltage of permission input KR1184KN2, V: Shutdown	> 2,4
inclusion	<0,8
Enable input hysteresis, mV	200
ok consumption (all keys are on, output is off), µA	<160
Output leakage current, μA	<10
DC load current of each input, A	> 0,5
Output short circuit current, A	0,5 1,25
Threshold limit current, A	<2,2
Turn-on delay at the output at Rн = 10 Ohm, ms	0,5
Turn-on rise time at R = 10 Ohm, ms	1
Output turn-off delay, turn-on decay time at Rн = 10 Ohm, µs	<20
Key resistance mΩ, at Uin = 5 V, Iout = 0,5 A	<140
Uin = 3,3V, Iout = 0,5A	<180
Resolution input capacitance, pF	1
Threshold value of shutdown temperature, °C	135

Maximum permissible modes of operation

Input voltage, V	<6
Voltage at the outputs of the error flag, V	<6
Output voltage, V	<6
Control input voltage, V	-0,3 ... + 12
Current at the outputs of the error flag, mA	<50
Lead soldering temperature (5 s), °С	260
Ambient temperature, ° С	-10 ... + 70

Publication: cxem.net

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