IR3822MTR1PBF

Voltage - Output (Min/Fixed):	0.6V
Base Part Number:	IR3822MPBF
Supplier Device Package:	PQFN (5x6)
Package / Case:	15-PowerVQFN
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	600kHz
Current - Output:	4A
Voltage - Output (Max):	12V
Series:	SupIRBuck®
Voltage - Input (Max):	21V
Voltage - Input (Min):	2.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction to IR3822MTR1PBF

The IR3822MTR1PBF is a highly efficient, 3-phase interleaved PWM buck DC/DC synchronous step-down switching regulator controller from International Rectifier (IR). This device integrates an onboard MOSFET driver and advanced current-mode control as its main features, providing performance and flexibility to modern power supply systems. It also features adjustable soft-start and fault protection (including short-circuit, under-voltage lockout, over-temperature and over-current). In terms of application field, the IR3822MTR1PBF is used in low power embedded applications such as CPUs and ASICs, telecom systems, datacom equipment, portable electronics, and consumer products. Furthermore, its tiny package size (TSOP-5) makes it well suited for board space constrained designs.

Functional Overview of IR3822MTR1PBF

The IR3822MTR1PBF is a 3-phase interleaved PWM buck DC/DC synchronous step-down switching regulator controller. It operates in the current-mode control and includes an onboard MOSFET driver. Additionally, it can be paired with external MOSFETs for a wide range of operating parameters like input voltage, switch node voltage, maximum output current and output ripple voltage. The main parameters that can be tuned are; 1) Voltage Pre-Setting: A programmable voltage reference allows for precise control of the output voltage. This reference can be adjusted externally by adjusting a single external resistor. 2) Current Pre-Setting: The current limit is an adjustable protection feature which allows the user to set an estimated maximum output current before the circuit is fully loaded.3) Frequency Setting: The IR3822MTR1PBF comes with an internal oscillator fixed at 300kHz, but it also offers the possibility to change it externally to reduce the noise and EMI associated with higher switching frequencies.4) Soft-Start: An onboard internal soft-start provides soft start-up of the device.5) Fault Protection: IR3822MTR1PBF offers a variety of protections including short-circuit protection, over-voltage protection, under-voltage-lockout, over-current protection and over-temperature protection.

Working Principle of IR3822MTR1PBF

The IR3822MTR1PBF operates in the current-mode. It uses a fixed frequency of 300kHz and uses an internal oscillator. The internals oscillator runs at a fixed rate, and the output voltage is regulated by the adjustments made to the current mode.The IR3822MTR1PBF works through pulse width modulation (PWM). In Pulse Width Modulation, the output voltage is regulated by adjusting the width of the pulses. The output voltage is regulated by adjusting the duty cycle or the width of the pulses being delivered. The duty cycle is proportional to the output voltage. The duty cycle is adjusted by a feedback loop, through an error amplifier that detects the difference between the output voltage and a reference voltage. The IR3822MTR1PBF also features adjustable soft-start and fault protection features. During soft-start, the internal oscillator slowly ramps up the output voltage, reducing the inrush current spikes. The fault protection includes a variety of protections including over-voltage protection, under-voltage-lockout, over-current protection and over-temperature protection.

Conclusion

All in all, the IR3822MTR1PBF is a high-performance 3-phase interleaved PWM buck DC/DC synchronous step-down switching regulator controller from International Rectifier. It is used in embedded applications such as CPUs and ASICs, telecom systems, datacom equipment, portable electronics, and consumer products. Additionally, this device features adjustable soft-start and fault protection features, which make it well suited for board space constrained designs. Moreover, its current-mode control allows the user to tune the voltage pre-setting, current pre-setting and frequency setting, ensuring proper and safe operation of the circuit.

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