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LM5001SDE/NOPB Application Field and Working Principle

The LM5001SDE/NOPB is a monolithic step-down DC-to-DC switching regulator from the power management integrated circuit (PMIC) family. It is part of the Voltage Regulators category, namely DC DC Switching Regulators. It offers high power efficiency at a wide input voltage range, adjustable line and load regulation, external synchronization capability and programmable frequency.

Features

Some of the main features of the LM5001SDE/NOPB are:

• Wide Input Voltage Range from 6V to 20V
• Extra Wide Output Voltage Swing from 0.6V to VIN
• Current Mode Control with Programmable Frequency and Soft-Start
• Internal Adjustable Line and Load Regulation
• Programmable Switching Frequency up to 1MHz
• Internal Synchronization Capability
• Combination Internal Soft-Start and External Clock Synchronization
• Adaptive Slope Compensation
• Programmable Undervoltage Lockout with Hysteresis
• Overcurrent Protection with Pulse-by-Pulse Current Limit
• Drives up to 30V, 4A N-Channel MOSFETs
• Small Package Option

Applications

The LM5001SDE/NOPB was designed for a variety of applications. Some of these include:

• Cell Phones and PDAs
• Chargers, AC/DC Adapters and Power Supplies
• Uninterruptible Power Supplies (UPS)
• Computer and Workstations
• Embedded Computing
• Automotive
• Back-up, Battery-charging and Battery-management Systems
• Set-top Boxes
• Industrial and Instrumentation

Working Principle

The LM5001SDE/NOPB uses a fixed-frequency current-mode control method. This allows for fast line and load-transient response, low cycle-by-cycle current ripple and programmable frequency.

The regulator employs a constant frequency, peak current and valley current mode operation that results in a constant frequency output, small steady-state output ripple and small loads step response. In order to achieve this, the LM5001SDE/NOPB uses an on-board oscillator to determine the switching frequency and slope compensation to increase the feedback loop response time.

The on-board MOSFET gate driver is responsible for driving the N-channel power MOSFETs. It is designed to operate at a higher frequency than the input voltage, so that the output voltage is regulated in constant frequency mode over a wide range of input voltage and load.

The LM5001SDE/NOPB is equipped with a low-side FET current-limit and a high-side FET over-voltage protection with clamp diodes and zener diodes. An over-temperature shutdown circuit is also included.

The DC-to-DC regulator features adjustable output voltage and maximum current limit. It can be programmed through an external voltage divider, or through the internal resistor network. The feedback loop can be synchronized externally and the internal or external clock can be used to program the switching frequency and the soft start time.

Conclusion

The LM5001SDE/NOPB is a monolithic step-down DC-to-DC switching regulator from the power management integrated circuit (PMIC) family and is part of the Voltage Regulators category, specifically DC DC Switching Regulators. It offers high power efficiency, adjustable line and load regulation, external synchronization capability and programmable frequency, making it ideal for a wide range of applications.

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