LM5021MMX-1

LM5021MMX-1 is a Texas Instruments peak-current-mode PWM controller in the LM5021 family. It provides the control circuitry to regulate DC-DC converters by driving an external power MOSFET. The MMX-1 suffix denotes a specific package/pinout variant of the device.
Key features:
- Fixed-frequency, current-mode control with slope compensation for stable regulation
- Soft-start to limit inrush and overshoot
- Enable input and undervoltage lockout
- Overcurrent/overload protection and thermal shutdown
- Feedback input for output regulation
- Suitable for non-isolated and isolated topologies (buck, boost, buck-boost, flyback)
Typical usage:
- Pair with an external MOSFET and a sense resistor to form a switching regulator
- Use feedback network and compensation network to set output voltage and bandwidth
Note: Check the datasheet for exact pinout, voltage ranges, protection thresholds, and MMX-1 package details.

LM5021MMX-1 is TI’s high‑voltage MOSFET gate driver (high‑side/low‑side). Common equivalents with similar voltage/current and bootstrap capability include TI UCC27200/UCC27201/UCC27202 and UCC27210/UCC27211 families, Infineon IR2110/IR2113/IR2184, and ON Semiconductor NCP81074. For an exact cross‑reference, use TI’s cross‑reference tool to match voltage, current, bootstrap needs, and package.

Key features of LM5021MMX-1 (typical from datasheet):
- High-voltage, current-mode PWM controller for DC-DC converters (buck/boost/flyback/sepic).
- Wide input voltage range suitable for automotive/offline environments.
- Peak current-mode control for fast transient response using a current-sense input.
- External components set switching frequency via oscillator; flexible frequency choice.
- Soft-start to reduce inrush and output overshoot.
- Protection features: undervoltage lockout, overcurrent/short-circuit protection, and thermal shutdown.
- Enable/disable input for easy control and standby operation.
- Low quiescent current in normal operation; robust transients handling.
- 8-pin MSOP/MMX-1 package for compact designs.

- Pin count: 8 pins (MMX/MSOP-8 package)
- Function: High-voltage fixed-frequency, peak-current-mode PWM controller for off-line switch-mode power supplies and DC-DC converters. Drives an external MOSFET (gate drive), uses current-sense and feedback to regulate output, with oscillator set by RT/CT and protections (UVLO/OC/fault).

Manufacturer: Texas Instruments Incorporated (TI).
What kind of company: TI is an American multinational semiconductor company that designs and manufactures analog, mixed-signal, and embedded processing integrated circuits. Headquartered in Dallas, Texas.

LM5021MMX-1 is a high-voltage PWM controller (up to 600 V) used in switch‑mode power supplies. Typical applications include:
- Offline AC‑DC adapters and telecom/industrial SMPS (isolated topologies like flyback/forward)
- Nonisolated buck/boost regulators for universal-input supplies
- LED lighting drivers with constant‑current regulation
- Power supplies for consumer electronics and small appliances
- Any high‑voltage, fixed‑frequency, current‑mode SMPS design that requires start‑up and regulation at high voltage.

Eight-pin MSOP package with exposed pad (MSOP-8EP).