Texas Instruments LM2101DSGR

Overview

LM2101DSGR from Texas Instruments is a high-voltage, dual-channel N-channel MOSFET half-bridge gate driver in an 8-pin WSON package (2.0 mm × 2.0 mm), featuring 0.5-A/0.8-A peak source/sink output current, 115-ns typical propagation delay, and 8-V typical GVDD undervoltage lockout. It drives high-side and low-side FETs in BLDC motor inverters and cordless power tools.

For engineers reviewing the LM2101DSGR datasheet, LM2101DSGR pinout, LM2101DSGR application, or LM2101DSGR equivalent, key selection considerations include its –19.5-V SH transient voltage rating, 107-V BST absolute maximum voltage, independent TTL/CMOS-compatible INH/INL inputs, and thermal performance in the thermally enhanced DSG package.

Technical Context

The LM2101DSGR integrates a robust level shifter enabling high-speed, low-power control of the floating high-side driver referenced to SH, with precise delay matching (<30 ns between GL and GH transitions). Its UVLO circuitry independently monitors GVDD and VBST–SH, disabling only GH when BST falls below threshold while maintaining GL operation.

It supports bootstrap-based high-side drive up to 105 V recommended BST voltage, tolerates –19.5-V negative transients on SH (repetitive, <100 ns), and features internal 200-kΩ pulldown resistors on INH/INL to ensure defined low-state outputs during floating conditions - no external pull-downs required.

Key Specifications

Pinout & Package

LM2101DSGR uses an 8-pin WSON package (2.0 mm × 2.0 mm) with exposed thermal pad soldered to PCB ground plane for optimal heat dissipation. Pin numbering follows top-view orientation with pin 1 at bottom-left corner.

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, LM2101DSGR uniquely balances ultra-compact WSON packaging, industry-leading SH transient immunity, and precision timing - making it optimal for thermally constrained, battery-powered motor drives where reliability under electrical stress is non-negotiable.

Availability

LM2101DSGR is available at Aetrix Electronics and suitable for BLDC motor inverters, cordless power tools, e-bike controllers, and battery test equipment requiring stable component supply across production lifecycles.

Supply support for LM2101DSGR 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 leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The LM2101 product line delivers high-voltage, thermally optimized gate drivers for battery-powered motor control - designed specifically to replace discrete driver + level shifter combinations in space- and noise-sensitive applications.

FAQ

What is the maximum recommended operating voltage on the BST pin of the LM2101DSGR?

The LM2101DSGR specifies a recommended operating voltage on BST of up to 105 V (VBST – VSH). This is distinct from its absolute maximum rating of 107 V. Operating consistently above 105 V may accelerate parametric drift or reduce long-term reliability, especially under thermal stress. The device's UVLO threshold for BST is 7.6–8.5 V (rising), ensuring stable high-side operation even as bootstrap voltage decays during extended high-duty-cycle operation. Always maintain ≥1-V margin between actual BST voltage and 105 V in final design validation.

Does the LM2101DSGR require external pull-down resistors on INH and INL pins?

No, the LM2101DSGR does not require external pull-down resistors on INH and INL. Each input includes an internal 200-kΩ pulldown resistor, ensuring both GH and GL remain low when inputs are left unconnected or float. This eliminates BOM cost and layout area typically needed for discrete pull-downs. However, for noise-critical applications, TI recommends routing INH/INL traces away from switching nodes and keeping them short - the internal pulldown alone suffices for default safety state definition in the LM2101DSGR.

How does the LM2101DSGR handle negative voltage transients on the SH pin?

The LM2101DSGR is explicitly rated for –19.5-V repetitive negative transients on the SH pin (pulse width <100 ns), far exceeding standard –5-V or –10-V specifications. This capability stems from hardened level-shift circuitry and ESD protection structures designed for motor drive noise environments. During such transients, the internal high-side driver remains functional as long as VBST–VSH stays above UVLO threshold and SH remains lower than GH. TI confirms this rating is production-tested per characterization data in Section 6.3 of the LM2101DSGR datasheet - no external clamping diode is required for compliance in typical 48-V BLDC applications.

Can the LM2101DSGR drive both high-side and low-side MOSFETs simultaneously in a synchronous buck converter?

Yes, the LM2101DSGR is expressly designed for synchronous buck and half-bridge topologies, with independent INH and INL inputs enabling simultaneous or complementary control of high-side and low-side N-channel MOSFETs. Its matched 115-ns propagation delays and <30-ns delay mismatch (tMON/tMOFF) ensure precise timing coordination. However, because it has no built-in dead-time insertion, the host controller must generate appropriate dead time - a deliberate design choice to avoid fixed dead-time inefficiencies. This behavior is fully documented in Table 7-3 (Normal Mode Logic) of the LM2101DSGR datasheet.

What is the thermal performance difference between the LM2101DSGR (WSON) and LM2101D (SOIC)?

The LM2101DSGR in 8-pin WSON offers significantly better thermal performance than the LM2101D in SOIC: its junction-to-board thermal resistance (RθJB) is 44.6°C/W versus 76.7°C/W for the SOIC package. This 42% improvement allows the LM2101DSGR to dissipate ~1.8× more power at the same board temperature rise. For example, at 125°C junction temperature and 60°C board temperature, LM2101DSGR supports ~1.45 W continuous loss versus ~0.8 W for LM2101D - a critical advantage in sealed, fanless motor control modules where PCB copper area is limited. Both packages share identical silicon and electrical specs.