Texas Instruments LM2101DR

Overview

LM2101DR from Texas Instruments is a high-voltage, dual-channel N-channel MOSFET half-bridge gate driver IC with independent TTL/CMOS-compatible inputs, 0.5-A/0.8-A peak source/sink output capability, 115-ns typical propagation delay, and 8-V typical GVDD undervoltage lockout (UVLO). It drives high-side and low-side FETs in BLDC motor inverters and cordless power tools.

For engineers reviewing the LM2101DR datasheet, LM2101DR pinout, LM2101DR application, or LM2101DR equivalent, this page delivers verified electrical specs, thermal metrics, bootstrap-level-shifting architecture, UVLO thresholds, and real-world implementation guidance for high-noise motor drive systems.

Technical Context

The LM2101DR integrates a robust floating level shifter enabling high-side operation up to 105 V BST–SH, with –19.5-V transient negative voltage tolerance on SH. Its UVLO circuitry independently monitors GVDD (8.75-V rising threshold) and BST–SH (8.5-V rising threshold), each with 0.45-V hysteresis, ensuring reliable startup and fault recovery.

It features no built-in dead time-INH and INL inputs operate fully independently with no deglitch filtering-enabling precise microcontroller-controlled timing. Output stages deliver 0.25-V low-level and 0.8-V high-level voltage compliance under 100-mA load, supporting fast switching of low-Qg MOSFETs in 50-kHz+ motor control loops.

Key Specifications

Pinout & Package

LM2101DR is packaged in an 8-pin WSON (DSG) thermally enhanced package (2.00 mm × 2.00 mm) with exposed thermal pad soldered to PCB ground plane for optimal heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge gate driver applications.

Compared with UCC27211DR and IRS2005MTRPBF, LM2101DR uniquely balances compact WSON packaging, –19.5-V SH transient immunity, and precise 115-ns propagation matching-making it optimal for high-reliability, size-sensitive BLDC systems operating from 12–48-V battery rails.

Availability

LM2101DR is available at Aetrix Electronics and suitable for cordless power tools, e-bike motor controllers, BLDC inverters, and battery test equipment requiring stable component supply across production lifecycles.

Supply support for LM2101DR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and consumer markets.

The LM2101DR belongs to TI's high-voltage gate driver product line, engineered specifically for compact, thermally constrained motor control applications where bootstrap-based half-bridge operation, noise immunity, and precise timing are critical.

FAQ

What is the maximum recommended DC-link voltage for LM2101DR in half-bridge operation?

The LM2101DR supports a maximum BST voltage of 107 V absolute, with recommended operating BST–SH up to 105 V. For reliable long-term operation, TI specifies a maximum DC-link voltage of 95 V on the SH pin under DC conditions. Therefore, the practical maximum DC-link voltage is 80 V (e.g., 48-V nominal battery with 66% overvoltage margin), ensuring headroom for transients and thermal derating. The LM2101DR datasheet confirms this in Section 6.3 Recommended Operating Conditions.

Does LM2101DR require external bootstrap diodes, and what specifications are critical?

Yes, LM2101DR requires an external bootstrap diode (DBOOT) between GVDD and BST pins. Critical specifications include: reverse recovery time < 30 ns, forward voltage < 1 V, and peak current rating ≥ 5 A (calculated using Equation 1 in the LM2101DR datasheet). TI recommends Schottky diodes (e.g., RB055LAM-40) for low Vf and negligible Qrr. A series resistor (RBOOT = 2–10 Ω) is also required to limit inrush current and damp ringing-this is explicitly detailed in Section 8.2.2.1 of the LM2101DR datasheet.

How does LM2101DR handle negative voltage transients on the SH pin, and why is this important?

The LM2101DR is rated for –19.5-V transient voltage on the SH pin (pulse width < 100 ns), far exceeding standard –1-V DC rating. This capability prevents false triggering or latch-up during high-dI/dt events common in cordless tools and e-bikes, where parasitic inductance causes the switch node to dip below ground before the low-side MOSFET body diode clamps it. This specification is validated per Section 6.1 Absolute Maximum Ratings and directly enables robust operation without external Schottky clamps in most designs-confirmed in Section 7.3.5 of the LM2101DR datasheet.

Can LM2101DR drive both high-side and low-side MOSFETs simultaneously, and what prevents shoot-through?

No, LM2101DR does not prevent shoot-through internally-it provides fully independent INH and INL inputs with no built-in dead time. Shoot-through prevention must be implemented in the external controller (e.g., MCU or PWM generator) by inserting precise dead time between complementary INH/INL transitions. This design choice preserves timing accuracy and avoids fixed delays that degrade efficiency. Section 7.3.2 of the LM2101DR datasheet explicitly states "there is no built-in dead time," and Table 7-3 shows all four input combinations produce corresponding GH/GL outputs without interlock.

What is the thermal performance difference between LM2101DR's DSG and SOIC packages?

The LM2101DR DSG (WSON-8) package has RθJA = 78.2°C/W, while the SOIC-8 (D package) version has RθJA = 133.2°C/W-nearly 42% lower thermal resistance. This difference arises from the DSG's exposed thermal pad, which must be soldered to the PCB ground plane. As shown in Section 6.4 Thermal Information, the DSG also achieves RθJB = 44.6°C/W versus 76.7°C/W for SOIC, meaning more heat transfers directly into the board. For motor drivers dissipating >0.8 W, the DSG package (used in LM2101DR) is essential to maintain junction temperature below 125°C in compact layouts.