MAX5951ETJ+

Frequency - Switching:	100kHz ~ 1MHz
Base Part Number:	MAX5951
Supplier Device Package:	32-TQFN-EP (5x5)
Package / Case:	32-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Frequency Control, Power Good
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	88%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 16 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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Introduction to the MAX5951ETJ+

The MAX5951ETJ+ is a high-speed, high-performance synchronous current-mode DC-DC controller produced by Maxim Integrated. This chip is intended for applications such as notebook, desktop and enterprise computer power supplies, and for numerous other non-computer applications. Additionally, it offers optimal performance for automotive power systems.

Application Field

The MAX5951ETJ+ can be used in a wide variety of applications. It can be used in switching DC-DC boost, buck, buck-boost, and charge pumps. It is also suitable for various architectures including synchronous buck, inverting buck-boost, dual-phase interleaved buck, and single-ended primary inductance converter (SEPIC).The MAX5951ETJ+ has advantages over other DC-DC controllers, such as low-current operation, a wide frequency range, and its flexibility. For example, it can operate at a frequency as low as 300 kHz, allowing designers to optimize on PCB area and choose a more cost-effective design. Its external logic circuitry integrates high-side BiCMOS gated-SMPS driver, providing control of low-on-time with enhanced MOSFET drive capability. It also features spread spectrum clock to reduce system-level EMI.

Working Principle

The MAX5951ETJ+ uses a synchronous current-mode architecture to achieve its high performance. This architecture typically controls the output voltage of the power supply by regulating the current flow through a shunt regulator (also known as load line regulation). The current mode regulation is based on the relationship between the output voltage and the current in the sense resistor.The MAX5951ETJ+ features advanced current-mode control, which allows it to have fast transient response and excellent line/load regulation performance. It also has a programmable compensation network for optimizing the system for stability and transient performance. The MAX5951ETJ+ provides programmable soft-start and soft-stop, adjustable voltage and current limit, and programmable slope compensation. Additionally, it offers current-mode frequency-hopping anti-ringing to reduce audible noise during switching.

Conclusion

The MAX5951ETJ+ offers optimal performance and flexibility for a wide range of applications in the industrial and consumer markets. Its advanced current-mode regulation provides excellent line/load regulation, fast transient response and excellent EMI performance. It is also suitable for a variety of architectures, allowing designers to optimize PCB area and cost. With its wide range of features, this device provides a reliable and cost-effective solution for DC-DC switching controllers.

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