LMH6321

ACTIVE

300 mA High Speed Buffer with Adjustable Current Limit

Product details

Architecture Fixed Gain/Buffer Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 5 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 30 GBW (typ) (MHz) 110 BW at Acl (MHz) 110 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 1800 Vn at flatband (typ) (nV√Hz) 2.8 Vn at 1 kHz (typ) (nV√Hz) 5 Iq per channel (typ) (mA) 11 Vos (offset voltage at 25°C) (max) (mV) 35 Features Adjustable BW/IQ/IOUT Rating Catalog Operating temperature range (°C) -40 to 125 Input bias current (max) (pA) 15000 Iout (typ) (mA) 300 2nd harmonic (dBc) 68 3rd harmonic (dBc) 73 Frequency of harmonic distortion measurement (MHz) 1
Architecture Fixed Gain/Buffer Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 5 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 30 GBW (typ) (MHz) 110 BW at Acl (MHz) 110 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 1800 Vn at flatband (typ) (nV√Hz) 2.8 Vn at 1 kHz (typ) (nV√Hz) 5 Iq per channel (typ) (mA) 11 Vos (offset voltage at 25°C) (max) (mV) 35 Features Adjustable BW/IQ/IOUT Rating Catalog Operating temperature range (°C) -40 to 125 Input bias current (max) (pA) 15000 Iout (typ) (mA) 300 2nd harmonic (dBc) 68 3rd harmonic (dBc) 73 Frequency of harmonic distortion measurement (MHz) 1
HSOIC (DDA) 8 29.4 mm² 4.9 x 6 TO-263 (KTW) 7 153.924 mm² 10.1 x 15.24
  • High slew rate 1800 V/µs
  • Wide bandwidth 110 MHz
  • Continuous output current ±300 mA
  • Output current limit tolerance ±5 mA ±5%
  • Wide supply voltage range 5 V to ±15 V
  • Wide temperature range −40°C to +125°C
  • Adjustable current limit
  • High capacitive load drive
  • Thermal shutdown error flag
  • High slew rate 1800 V/µs
  • Wide bandwidth 110 MHz
  • Continuous output current ±300 mA
  • Output current limit tolerance ±5 mA ±5%
  • Wide supply voltage range 5 V to ±15 V
  • Wide temperature range −40°C to +125°C
  • Adjustable current limit
  • High capacitive load drive
  • Thermal shutdown error flag

The LMH6321 is a high speed unity gain buffer that slews at 1800 V/µs and has a small signal bandwidth of 110 MHz while driving a 50 Ω load. It can drive ±300 mA continuously and will not oscillate while driving large capacitive loads.

The LMH6321 features an adjustable current limit. The current limit is continuously adjustable from 10 mA to 300 mA with a ±5 mA ±5% accuracy. The current limit is set by adjusting an external reference current with a resistor. The current can be easily and instantly adjusted, as needed by connecting the resistor to a DAC to form the reference current. The sourcing and sinking currents share the same current limit.

The LMH6321 is available in a space saving 8-pin SO PowerPAD or a 7-pin DDPAK power package. The SO PowerPAD™ package features an exposed pad on the bottom of the package to increase its heat sinking capability. The LMH6321 can be used within the feedback loop of an operational amplifier to boost the current output or as a stand alone buffer.

The LMH6321 is a high speed unity gain buffer that slews at 1800 V/µs and has a small signal bandwidth of 110 MHz while driving a 50 Ω load. It can drive ±300 mA continuously and will not oscillate while driving large capacitive loads.

The LMH6321 features an adjustable current limit. The current limit is continuously adjustable from 10 mA to 300 mA with a ±5 mA ±5% accuracy. The current limit is set by adjusting an external reference current with a resistor. The current can be easily and instantly adjusted, as needed by connecting the resistor to a DAC to form the reference current. The sourcing and sinking currents share the same current limit.

The LMH6321 is available in a space saving 8-pin SO PowerPAD or a 7-pin DDPAK power package. The SO PowerPAD™ package features an exposed pad on the bottom of the package to increase its heat sinking capability. The LMH6321 can be used within the feedback loop of an operational amplifier to boost the current output or as a stand alone buffer.

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Technical documentation

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Type Title Date
* Data sheet LMH6321 300 mA High Speed Buffer with Adjustable Current Limit datasheet (Rev. D) PDF | HTML 24 Sep 2021
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
User guide LMH6321 PSOP & TO-263 Sin Open Loop HS Buffer Eval Brds (Rev. C) 03 May 2013
Application note Reference Clock Loop Through Application 16 Jan 2009

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMH6321MR-EVAL — Evaluation PCB for High-Speed Single Open-Loop Buffer in the 8-Pin PSOP Package

TI offers this unpopulated Evaluation Board to aid in the evaluation and testing of high-speed Open-Loop Buffer that are offered in the 8-Pin PSOP package. Resistors, capacitors, or any other surface-mount components can be easily mounted on this board in the desired circuit configuration. The (...)

User guide: PDF
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Simulation model

LMH6321 PSPICE Model

SNOM148.ZIP (2 KB) - PSpice Model
Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

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The voltage divider calculation tool (VOLT-DIVIDER-CALC) quickly determines a set of resistors for a voltage divider. This KnowledgeBase JavaScript utility can be used to find a set of resistors for a voltage divider to achieve the desired output voltage. VOLT-DIVIDER-CALC can also be used to (...)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
Package Pins CAD symbols, footprints & 3D models
HSOIC (DDA) 8 Ultra Librarian
TO-263 (KTW) 7 Ultra Librarian

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