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LM5007MMX/NOPB

80V 500mA buck regulator, integrated MOSFET, COT control, 525kHz, VSSOP-8

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Manufacturer Part：

LM5007MMX/NOPB

Package：

8-VSSOP (3.0 x 3.0 x 0.9mm)

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Description

Product Overview

The LM5007MMX/NOPB from Texas Instruments is a 80V, 500mA step-down switching regulator with integrated 80V N-channel MOSFET, constant on-time (COT) control, 525kHz switching frequency, and smart current limit in an 8-pin VSSOP package.

Key Specifications

Manufacturer Texas Instruments
Topology Buck (Step-Down)
Input Voltage Range 9.5V to 80V
Output Voltage Adjustable (2.5V to 75V)
Output Current 500mA
Switching Frequency 525kHz typical
Integrated MOSFET 80V N-channel
Quiescent Current 2.5mA typical
Shutdown Current 25uA typical
Control Mode Constant On-Time (COT)
Package 8-VSSOP (3.0 x 3.0mm)
Operating Temperature -40C to +125C

Features

  • 80V maximum input voltage with integrated 80V MOSFET
  • 500mA output current
  • Constant on-time (COT) control with no compensation required
  • 525kHz pseudo-fixed switching frequency
  • Smart current limit with reduced on-time during fault
  • Internal soft-start (2ms typical)
  • Thermal shutdown protection
  • Undervoltage lockout (6.3V/5.4V)
  • High-voltage bias regulator with external supply option
  • Small 8-pin VSSOP package

Applications

  • Industrial and automotive power supplies
  • 48V telecom bus regulation
  • High-voltage battery-powered systems
  • LED driver buck regulators
  • Off-line auxiliary power supplies

The Texas Instruments LM5007MMX/NOPB is a step-down switching regulator with an integrated 80V N-channel MOSFET, capable of delivering 500mA output current. The wide 9.5V to 80V input range makes it suitable for industrial, telecom (48V bus), and automotive applications. The constant on-time (COT) control architecture eliminates the need for loop compensation components, simplifying design. The internal high-voltage start-up bias regulator operates from the input supply and switches to an external bias when available for improved efficiency. The smart current limit feature reduces the on-time during overload, limiting both switch current and power dissipation. The 525kHz pseudo-fixed switching frequency provides a good balance between efficiency and component size.

The LM5007MMX/NOPB operates as a constant on-time (COT) buck converter: 1) On-Time Generation: The on-time is set by an internal one-shot timer, programmed by an external RON resistor connected to VIN. The on-time is inversely proportional to VIN, naturally maintaining approximately constant switching frequency (525kHz). 2) Regulation: The FB pin monitors the output voltage through a resistor divider. When FB drops below the 2.5V internal reference, a new on-time cycle is initiated. This hysteretic control inherently provides stability without external compensation. 3) Current Limit: The smart current limit monitors the switch current. When the peak current exceeds the threshold, the on-time is reduced to limit average current while maintaining switching frequency, preventing thermal runaway during sustained faults. 4) Bias Regulator: The internal VCC regulator starts from VIN using an internal 80V LDO, then optionally switches to an external VCC supply (from the output) for improved efficiency at higher input voltages.

Pin Name Type Function
1 SW Output Switch output (connect to inductor and Schottky)
2 BOOT Capacitor Bootstrap capacitor (connect to SW)
3 NC – No connection
4 VIN Power Input supply (9.5V to 80V)
5 RON Input On-time programming resistor (connect to VIN)
6 FB Input Feedback (2.5V reference)
7 VCC Power Internal bias regulator output / external bias input
8 GND Ground Ground
  • 48V telecom bus to 5V/3.3V point-of-load conversion
  • Automotive 12V/24V battery to logic supply regulation
  • Industrial 24V to 12V step-down with 80V transient protection
Manufacturer Part Number Package Notes
TI LM5008AMMX/NOPB VSSOP-8 95V, 350mA, higher voltage
TI LM5009AMMX/NOPB VSSOP-8 95V, 150mA, lower current
TI LMR16030PDDAR HSOIC-8 60V, 3A, higher current
Monolithic Power MP9486GN-Z SOIC-8 75V, 1A buck, non-isolated
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We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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