LM5116HJD

DC DC Switching Controllers Overview

The LM5116HJD is a wide range synchronous buck controller designed for high-voltage or wide input voltage step-down regulator applications. It utilizes simulated peak current mode control to provide inherent line feedforward, cycle-by-cycle current limiting, and simplified loop compensation. The device features an adjustable switching frequency ranging from 50 kHz to 1 MHz and supports output voltages between 1.215 V and 80 V. It operates with an input voltage range of 6 V to 100 V and can drive external NMOS power switches with a peak gate drive current of 3.5 A. The controller includes a high-voltage bias supply, thermal shutdown, and frequency synchronization capabilities.

DC DC Switching Controllers Feature Summary

• Simulated peak current mode control reduces PWM noise sensitivity for reliable operation at small duty cycles
• Adaptive dead-time control drives external high-side and low-side NMOS power switches
• User-selectable diode emulation mode enables discontinuous conduction mode for improved light-load efficiency
• Integrated high-voltage bias supply with automatic switching to external auxiliary power

DC DC Switching Controllers Applications

• High-voltage point-of-load (POL) converters
• Industrial motor drives and power supplies
• Automotive electronics systems
• Telecommunications infrastructure power distribution

DC DC Switching Controllers Procurement Notes

Verify the package type matches the HTSSOP-20 specification with exposed pad. Confirm the suffix indicates standard commercial/industrial temperature grade unless otherwise specified in the official datasheet. Ensure the ordering part number aligns with the specific tape-and-reel or tube packaging requirements for your assembly process. Cross-reference the manufacturer's latest revision notes for any pinout or electrical parameter updates.

DC DC Switching Controllers Selection Notes

Select this component when designing synchronous buck converters requiring input voltages up to 100 V. The simulated current mode control is suitable for applications needing robust performance under varying line conditions. Consider the 3.5 A peak gate drive capability for driving standard or logic-level MOSFETs. Evaluate the need for frequency synchronization if multiple converters operate in proximity to prevent subharmonic oscillation or audible noise.

DC DC Switching Controllers Part Context

The LM5116HJD belongs to the LM5116 family of wide-range synchronous buck controllers from Texas Instruments. This series is engineered for high-voltage applications where traditional controllers may fail due to limited input voltage ratings. The HJD suffix typically denotes a specific package variant, often associated with the HTSSOP-20 form factor with an exposed thermal pad, distinguishing it from other pin-compatible or functionally similar devices in the broader power management portfolio.

DC DC Switching Controllers Replacement Considerations

LM5116MH/NOPB

DC DC Switching Controllers FAQ

How does the LM5116 handle small duty cycles in high-input voltage applications?

It uses simulated peak current mode control with a built-in ramp, which reduces PWM noise sensitivity and ensures stable operation even at very small duty cycles required by high input voltages.

What protection features are integrated into the LM5116HJD?

The device includes thermal shutdown, cycle-by-cycle current limiting, and programmable input undervoltage lockout (UVLO) to protect against over-temperature, over-current, and insufficient input voltage conditions.