LTC3807IUDC#PBF

PMIC - Voltage Regulators - DC DC Switching Controllers

The LTC®3807IUDC#PBF is a low-voltage, high-performance DC-to-DC switch-mode controller. It is well-suited for applications that require a wide range of control and protection. The device offers a high-efficiency, low-cost solution for point-ofload (POL) applications. The controller operates from an input voltage range of 3V to 60V and can drive a high-efficiency brushed or brushless DC (BLDC) motor from 3V to 33V.

When used with LTC3807IUDC#PBF, the DC-DC converter topology offers the following features:

• Simple and easy implementation of a synchronous buck converter with an internal high-speed PWM driver
• External MOSFETs driven via programmable low-side/high-side gate drivers
• Integrated under-voltage lockout (UVLO), current limit, and over-voltage protection
• Compact solution size suitable for portable and battery-powered applications, as well as automotive

The simple, efficient, and cost-effective LTC3807IUDC#PBF is the ideal solution for a wide range of DC-DC switch-mode power applications, including battery-powered systems, automotive sub-systems, and high-current lighting and motor-drive systems.

Working Principle

The LTC3807IUDC#PBF utilizes a synchronous buck converter topology. This topology uses a single switch to control the input and output voltages. The converter operates by driving the external MOSFETs with a high-speed PWM driver, which is initialized by the EN pin and controlled via the ENA pin.

The PWM modulated signal is fed to the external MOSFETs, which switch at the frequency set by the feedback pin and the external RSENSE resistors. The external feedback resistors and capacitors set the output voltage and current, respectively. The device also includes internal protection circuitry such as an under-voltage lockout (UVLO), a programmable current limit, and an over-voltage protection (OVP).

The LTC3807IUDC#PBF also includes circuitry to regulate the output current of the DC-DC converter. This is useful for preventing over-current faults in systems with high-impedance power sources.

Applications

Due to its wide application range, the LTC3807IUDC#PBF is one of the most common DC-DC switching controllers for a variety of applications including:

• Battery-powered systems
• Cellular phones
• Medical equipment
• Industrial systems
• Automotive sub-systems
• Peripheral power supply
• High-current lighting and lighting control
• High-current motor drive applications

The LTC3807IUDC#PBF is an ideal solution for a wide range of point-of-load applications, providing the high efficiency and low component count of a synchronous buck converter topology.