Texas Instruments LM25101CMA/NOPB

Overview

LM25101CMA/NOPB from Texas Instruments is a 1-A peak-output, 80-V half-bridge gate driver IC designed to independently control high-side and low-side N-channel MOSFETs in synchronous buck and half-bridge power stages. It features TTL-input logic, integrated bootstrap diode, 25-ns typical propagation delay, 8-ns rise/fall times into 1000-pF load, and dual undervoltage lockout (UVLO) on VDD and HB–HS rails. It is used in 48-V server power supplies and solar DC-DC converters.

For engineers reviewing the LM25101CMA/NOPB datasheet, LM25101CMA/NOPB pinout, LM25101CMA/NOPB application, or LM25101CMA/NOPB equivalent, key selection criteria include its 1-A peak sourcing/sinking capability, 100-V bootstrap rail tolerance, 3.9 mm × 4.89 mm SO PowerPAD package, and independent HI/LI input control - all critical for high-efficiency, high-voltage switching designs requiring precise timing and robust level shifting.

Technical Context

The LM25101CMA/NOPB implements a robust high-speed level shifter to drive the HO output referenced to the HS node, enabling operation with up to 100-V DC bootstrap supply. Its dual UVLO circuitry independently monitors VDD (6.9-V rising threshold) and HB–HS (6.6-V rising threshold), disabling HO during bootstrap under-voltage while preserving LO functionality.

It uses TTL-compatible inputs (VIH = 2.3 V max, VIL = 1.3 V min) with 50-mV hysteresis and delivers matched propagation delays (≤10 ns mismatch between HO/LO turn-on/off). The internal bootstrap diode (VDH = 1.0 V @ 100 mA, RD = 1.65 Ω) eliminates need for external fast-recovery diodes in many applications.

Key Specifications

Pinout & Package

The LM25101CMA/NOPB is packaged in an 8-pin SO PowerPAD (DAA) with 3.9 mm × 4.89 mm body size and exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJB = 13.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5101AMX/NOPB and UCC27201D, the LM25101CMA/NOPB provides optimal balance of cost, integration (integrated diode), and thermal performance in 48-V industrial and solar applications where 1-A drive suffices and board space is constrained.

Availability

LM25101CMA/NOPB is available at Aetrix Electronics and suitable for motor-control drivers, synchronous buck converters, half-bridge power converters, and solar DC-DC applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for LM25101CMA/NOPB 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 specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability industrial and automotive power solutions.

The LM25101 series belongs to TI's high-voltage gate driver product line, engineered specifically for efficient, robust control of N-channel MOSFETs in isolated and non-isolated DC-DC topologies up to 100-V bootstrap voltage.

FAQ

What is the maximum bootstrap voltage supported by the LM25101CMA/NOPB?

The LM25101CMA/NOPB supports a maximum bootstrap supply voltage (HB relative to HS) of 100 V DC, as specified in its Absolute Maximum Ratings table. This enables use in high-input-voltage applications such as 48-V server power and solar MPPT stages where the switch node swings near 100 V. Operation beyond this limit risks permanent damage to the internal bootstrap diode and level-shifter circuitry.

Does the LM25101CMA/NOPB require an external bootstrap diode?

No, the LM25101CMA/NOPB integrates a bootstrap diode with 1.0-V forward voltage at 100 mA and 1.65-Ω dynamic resistance. External diodes are optional and only recommended in high-reliability or high-temperature applications where enhanced reverse recovery performance is needed. The integrated diode eliminates BOM and layout overhead in standard 48-V and telecom power designs.

How does the LM25101CMA/NOPB handle undervoltage conditions on VDD and HB–HS rails?

The LM25101CMA/NOPB implements independent undervoltage lockout (UVLO) circuits: VDD UVLO triggers at 6.9 V (±0.5 V hysteresis), holding both HO and LO low until valid supply is restored; HB–HS UVLO activates at 6.6 V (±0.4 V hysteresis) and disables only HO while allowing LO to remain functional - preventing shoot-through while maintaining low-side control during bootstrap charging faults.

What package type is used for the LM25101CMA/NOPB, and why is thermal pad connection critical?

The LM25101CMA/NOPB uses the 8-pin SO PowerPAD (DAA) package with an exposed thermal pad. TI specifies that this pad must be soldered to a PCB ground plane to achieve RθJB = 13.8°C/W. Without proper thermal pad connection, junction temperature can exceed 125°C under 1-A continuous drive, leading to premature thermal shutdown or reliability degradation in industrial applications.

Can the LM25101CMA/NOPB drive both high-side and low-side MOSFETs simultaneously in a synchronous buck converter?

Yes, the LM25101CMA/NOPB is explicitly designed for synchronous buck and half-bridge topologies. Its independent HI and LI inputs allow full control of HO and LO outputs, enabling complementary, phase-shifted, or burst-mode drive schemes. The matched propagation delays (≤10 ns mismatch) and dual UVLO ensure safe, coordinated switching - critical for minimizing shoot-through and maximizing efficiency in buck regulators.