LMH6321TS

Overview

The LMH6321 is a high-speed unity gain buffer featuring a slew rate of 1800 V/µs and a small-signal bandwidth of 110 MHz while driving a 50Ω load. It provides continuous output current capability of ±300 mA and maintains stability when driving large capacitive loads without oscillation. The device includes an adjustable current limit with ±5 mA accuracy, set via an external reference current. It operates on supply voltages ranging from 5V to ±15V and supports an extended temperature range from −40°C to +125°C.

Feature Summary

• High-speed performance with 1800 V/µs slew rate and 110 MHz bandwidth for fast signal transmission.
• Adjustable current limit allows precise control of output sourcing and sinking currents from 10 mA to 300 mA.
• Capable of driving large capacitive loads continuously without instability or oscillation.
• Integrated thermal shutdown protection accompanied by an error flag output for system monitoring.

Applications

• Line driver applications requiring high current drive capabilities.
• Pin driver circuits for interfacing with peripheral devices.
• Sonar driver systems demanding fast transient response.
• Motor control loops utilizing the buffer within operational amplifier feedback paths.

Procurement Notes

Verify the specific package variant (SO PowerPAD or DDPAK) required for your thermal design constraints. Confirm that the operating supply voltage remains within the specified 5V to ±15V range to ensure proper functionality. Ensure adequate bypassing with tantalum and ceramic capacitors near the supply pins to handle high transient currents during fast slewing operations.

Selection Notes

Select this component when high-speed buffering with significant current drive is necessary. It serves as an effective substitute for standard op-amps configured as buffers where higher bandwidth and current are needed. Consider the available heat dissipation methods, as the SO PowerPAD offers superior thermal sinking compared to the DDPAK package for high-power applications.

Part Context

This device belongs to Texas Instruments' portfolio of high-speed linear amplifiers. It is designed to boost the current output of operational amplifiers when placed in their feedback loop or used as a standalone buffer. The architecture utilizes an open-loop complementary follower design to achieve low phase shift and propagation delay compared to closed-loop alternatives.

Replacement Considerations

LMH6321TS/NOPB