LM5021MMX-1

LM5021MMX-1 is a Texas Instruments high-voltage gate-driver/controller in the LM5021 family. It is designed to drive external MOSFETs in switch-mode power supplies and LED-driver circuits, and can be used in various topologies such as buck/boost/flyback and half-bridge configurations.
Key points:
- Purpose: provides gate drive currents and timing for external N-channel MOSFETs in high-voltage power conversion.
- Features: typical protection and control functions common to TI power drivers (e.g., undervoltage lockout, protection against overcurrent/overtemperature, and soft-start/timing control). External components set switching frequency and timing.
- Applications: switching regulators, LED drivers, motor drivers, and other high-voltage, high-speed switching needs.
- Packaging: MMX denotes a specific TI packaging option; check the datasheet for exact pinout, electrical specs, and material package details.
Note: For exact voltage range, drive strength, timing characteristics, and recommended circuits, consult the LM5021MMX-1 datasheet and TI product page.

Here are concise features for the LM5021MMX-1:
- High-voltage operation: wide input range (suitable for buck topologies up to around 60V).
- Current-mode PWM control with slope compensation for stable regulation.
- Drives an external N-channel MOSFET (gate-drive output) for buck converters.
- Switching frequency: selectable via external components (flexible timing for different designs).
- Soft-start to limit inrush and improve startup behavior.
- Protections: overcurrent/short-circuit (cycle-by-cycle current limit), undervoltage lockout with hysteresis, and thermal shutdown.
- Enable input for easy shutdown and power-down control.
- Internal reference and error amplifier to support feedback via resistive divider.
- 8-pin MMX package (compact MSOP-style) for small, efficient designs.
Note: for exact electrical specifications (voltage ranges, current limits, timings), please consult the latest TI datasheet for LM5021MMX-1.

8-pin MSOP package (MSOP-8).

8 pins (MMX package). It is a dual high‑side/low‑side MOSFET gate driver for a half‑bridge: HO drives the high-side FET, LO drives the low-side FET, using a bootstrap supply (VB–VS) with logic inputs IN and EN, and power pins VCC and GND.

Manufacturer: Texas Instruments (originally National Semiconductor; now TI after acquisition).
What kind of company: TI is a global American multinational corporation that designs and manufactures semiconductors and related components (analog, mixed-signal, and other ICs). National Semiconductor was a U.S. semiconductor company specializing in analog/mixed-signal ICs before its acquisition.

Applications:
- High‑voltage buck regulators for offline switch‑mode power supplies
- DC‑DC converters in telecom and industrial equipment
- LED driver circuits
- Battery charging circuits
- AC‑DC adapters and other high‑voltage power modules
- General high‑voltage, current‑mode control for power management (isolated/non‑isolated converters)

There isn’t a published one-to-one cross reference for LM5021MMX-1. It’s TI’s LED-driver controller; for substitutions, use TI’s Cross Reference tool. Closest TI functionally similar parts are LM5020 and LM5022 (and other LM502x LED-driver controllers in the same family). Other vendors offer similar LED-driver controllers (e.g., ON Semiconductor NCP1xxx/NCP12xx, Analog Devices/LTC LED-driver families). Exact replacement requires matching input voltage, current sense method, output current, switching frequency, and packaging.