Series:	Automotive, AEC-Q100
Packaging:	Tape & Reel (TR)
Part Status:	Active
Output Type:	Transistor Driver
Function:	Step-Down
Output Configuration:	Positive
Topology:	Buck
Number of Outputs:	1
Output Phases:	1
Voltage - Supply (Vcc/Vdd):	3 V ~ 42 V
Frequency - Switching:	Up to 500kHz
Duty Cycle (Max):	75%
Synchronous Rectifier:	No
Clock Sync:	Yes
Serial Interfaces:	--
Control Features:	Enable, Frequency Control, Ramp, Soft Start
Operating Temperature:	-40°C ~ 125°C (TJ)
Package / Case:	20-PowerTSSOP (0.173", 4.40mm Width)
Supplier Device Package:	20-HTSSOP
Base Part Number:	LM25118

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PMIC - Voltage Regulators - DC DC Switching Controllers

The LM25118Q1MHE/NOPB is a multifunction, synchronous buck (step-down) current/voltage-mode DC-DC control circuit. It is designed to provide fast transient responses using a current-mode architecture. It offers a wide range of dynamic loop responses, allowing users to optimize the circuit performance to match their application requirements.The LM25118Q1MHE/NOPB is compatible with a wide range of operating voltages, both input and output. It is capable of providing very low output ripple and is designed to provide superior EMI performance.The LM25118Q1MHE/NOPB incorporates protection features, such as overcurrent protection, thermal shutdown and adjustable overvoltage protection. It is capable of providing a wide range of output voltage levels with excellent line/load regulation. It is also capable of providing high efficiency operation over a wide range of load conditions.The LM25118Q1MHE/NOPB is an excellent choice for a wide range of applications, including personal computers, notebook computers, industrial control systems, communication systems and general purpose DC-DC power conversion.

Application Field

The LM25118Q1MHE/NOPB is primarily intended for use in DC-DC power converters with conversions from 3.3.V up to 60V input. Some specific applications include:

• Automotive systems
• Portable computers, notebooks, and other portable devices
• Consumer electronics
• Industrial control applications
• Powering high power LED systems
• Telecommunication systems
• Power supplies with active PFC (power factor correction) function

Working Principle

The LM25118Q1MHE/NOPB provides a current regulated output, by regulating the output current at a fixed level. This is achieved by sampling the output current with a dedicated current sense pin. The control circuit is able to control a wide range of output currents, within a wide range of input voltages and load conditions.The LM25118Q1MHE/NOPB uses a constant frequency current-mode control scheme. This approach provides fast load and line response and excellent transient response characteristics.The LM25118Q1MHE/NOPB also provides an adjustable overvoltage protection circuitry, which keeps the output voltage from exceeding a user-defined level. This feature protects both the load and the converter against any possible faulty conditions.Furthermore, the LM25118Q1MHE/NOPB provides thermal and overcurrent protection. The converter enters a protection mode if the junction temperature or output current exceeds the pre-defined levels. In this mode, the output voltage is forced to zero and the output will remain disabled until the temperature is reduced or the fault condition is removed. To enable a cost effective, highly efficient design, the LM25118Q1MHE/NOPB integrates a low-side power MOSFET with a PWM reverse current protection diode. This combination eliminates the need for an additional external synchronous MOSFET, resulting in reduced component count and improved efficiency, as well as improved reliability. Finally, the LM25118Q1MHE/NOPB includes various features to allow simpler design and better performance. These features include spread spectrum modulation, input voltage under voltage protection, peak current limit programming and a fast transient response.In summary, the LM25118Q1MHE/NOPB is an excellent solution for a wide range of applications that require control of a step down current or voltage mode Power Converter. It provides excellent performance and ease of use, allowing designers to take full advantage of the high efficiency, fast transient response and superior thermal performance it provides.

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