LT1949ES8#PBF

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PMIC - Voltage Regulators - DC DC Switching Regulators

The LT1949ES8#PBF is an efficient, synchronous, step-down DC-DC switching regulator with an integrated Low-Side MOSFET. It is an excellent replacement for cost-sensitive and low power applications, as it operates with minimal components, thus reducing the design complexity. The device also features a fixed 5V output voltage, a fixed 7.2A maximum output current, and an adjustable input voltage range from 3V to 36V. The device also has integrated temperature protection, undervoltage protection, and overload protection to guarantee reliable operation.

Features of the LT1949ES8#PBF include:

• Low-side MOSFET Switch, integrated Synchronous Buck Switching Regulator
• High-Efficiency Switching Operation: 6VIN to 5VOUT, 3.4A @ 94% Efficiency
• Voltage Feedback: Internal Regulator Reference Accuracy ±3%
• Switching Frequency: 280kHz (fixed rate)
• Output Voltage: Fixed 5V
• Output Current: 7.2A Max
• Input Voltage: Adjustable 3V to 36V
• Undervoltage Lockout: 2.8V
• Thermal Shutdown Circuit Protection
• Current Limit Protection with Overtemperature Warning

The primary operating principle for the LT1949ES8#PBF circuit is a switched-mode converter which works by rapidly switching a seriesswitch (MOSFET) between ground and VIN, thus creating a series of "on-off" pulses. An inductor is used to store the energy in the pulses, and a diode is placed across it to maintain conduction. The voltage across the inductor is then fed to the output through a rectifier bridge. The voltage feedback circuitry connected to the error amplifier helps to ensure that the output voltage remains at the desired level. The synchronous PWM controller also helps maintain this voltage and protect the MOSFET switch from excessive current.

The LT1949ES8#PBF is ideal for cost-sensitive, low power applications such as standby power supplies, portable electronics, cellular phones, and disk drives which require a high level of efficiency and a low quiescent current. The device\'s tight regulation and various protection features make it an excellent choice for applications that require a reliable, high-performance switching regulator.

The design of a switching regulator circuit requires careful attention to the control loop and its external components such as inductors and capacitors. In order to reduce design complexity, the LT1949ES8#PBF is designed to work with a variety of popular external components. All selected external components must be properly rated for the desired application, and the user must also be aware of the possible effects of parasitics (parasitic capacitance, inductance, and resistance) on the performance of the regulator.

In conclusion, the LT1949ES8#PBF switching regulator is an ideal choice for cost-sensitive and low power applications. It is an excellent choice for applications that require a reliable, high-performance switching regulator with integrated protection features. The ease of design and use of on-chip components, combined with its high level of efficiency, makes the LT1949ES8#PBF an excellent choice for low-power, cost-sensitive applications.

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