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Texas Instruments LM5000-3MTC
- Part No.:
- LM5000-3MTC
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5000-3MTC.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,811
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Product details
Overview
LM5000-3MTC from Texas Instruments is a high-voltage current-mode PWM controller IC optimized for flyback, boost, and forward DC/DC converter topologies. It integrates an 80V/2A NMOS power switch, supports 300kHz or 700kHz switching via FS pin selection, operates from 3.1V to 40V input, and delivers adjustable output voltage with external resistor divider feedback.
For engineers reviewing the LM5000-3MTC datasheet, LM5000-3MTC pinout, LM5000-3MTC application, or LM5000-3MTC equivalent, key selection considerations include its dual-frequency capability (300/700 kHz), internal current limit (2 A typ), thermal shutdown protection, softstart control via external capacitor, and compatibility with TSSOP-16 packaging for space-constrained industrial power supplies.
Technical Context
The LM5000-3MTC implements peak current-mode control with built-in slope compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier features 150–750 µmho transconductance and 280 V/V gain, enabling stable loop response when paired with external RC/CC compensation network on COMP pin.
Switching frequency is selected by grounding (300 kHz) or leaving open (700 kHz) the FS pin; maximum duty cycle is 85–90% in both modes. Protection includes input undervoltage lockout (2.74–3.10 V turn-on threshold), overtemperature shutdown, and cycle-by-cycle current limiting based on internal 2 A current sense threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 40 V - supports wide-input industrial and telecom power rails without pre-regulation |
| Internal Switch Rating | 80 V breakdown, 2 A current limit - enables direct interface with 48 V bus or PoE-derived inputs in isolated converters |
| Switching Frequency | 300 kHz (FS grounded) or 700 kHz (FS open) - allows trade-off between magnetics size and efficiency in compact designs |
| Feedback Reference | 1.259 V ±2.5 mV - sets precise output regulation via external resistor divider; line regulation <0.04 %/V |
| Quiescent Current | 2.5 mA (non-switching, VIN=12 V) - minimizes standby power loss in always-on systems |
| Thermal Resistance | 150 °C/W (TSSOP-16 package) - requires moderate PCB copper area for thermal management at full load |
| Softstart Control | 11 µA internal current source charges external capacitor - enables controlled ramp-up of output voltage to prevent inrush stress |
Pinout & Package
LM5000-3MTC is packaged in a 16-lead thermally enhanced TSSOP (MTC suffix), with exposed pad connected to system ground for improved heat dissipation. Pin assignments are validated per TI SNVS176D datasheet Figure 2 and PIN DESCRIPTIONS table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (1) | Voltage error amplifier output | Connects to external RC/CC compensation network; determines loop stability and transient response |
| FB (2) | Feedback input | Senses output voltage via resistor divider; regulates output to 1.259 V reference |
| SHDN (3) | Enable/disable control | Open = enable; grounded = disable - supports remote ON/OFF sequencing in multi-rail systems |
| AGND (4) | Analog ground reference | Must be tied directly to PGND to minimize noise coupling into sensitive analog circuitry |
| PGND (5–8) | Power ground return | Four dedicated pins reduce IR drop and improve current handling for high-peak-switching currents |
| SW (9–11) | Switch node connection | Three parallel pins connect internal NMOS drain to external transformer primary or boost inductor |
| BYP (12) | Bypass capacitor terminal | Requires 0.1 µF ceramic capacitor to AGND for internal bias supply filtering |
| VIN (13) | Analog power input | Supplies internal circuitry; RC filter (10 Ω + ≥0.1 µF) recommended for noise immunity |
| SS (14) | Softstart timing input | External capacitor value sets startup time; charged by 11 µA internal current source |
| FS (15) | Frequency select | Ground = 300 kHz; open = 700 kHz - configures operating point without external clock |
| TEST (16) | Factory test pin | Must be grounded in application; no functional role in normal operation |
| Exposed Pad | Thermal & electrical ground | Connected to PCB ground plane to lower θJA and improve reliability under continuous load |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80 V / 2 A NMOS switch | Eliminates need for external high-voltage MOSFET and gate driver in medium-power isolated/non-isolated converters |
| Pin-selectable 300 kHz / 700 kHz operation | Enables layout reuse across platforms: low-frequency for efficiency, high-frequency for miniaturized magnetics |
| Current-mode control with slope compensation | Provides inherent line transient rejection and stable operation up to 90% duty cycle without external compensation |
| Programmable softstart via external capacitor | Prevents output overshoot and limits inrush current during power-up in battery-backed or hot-swap systems |
| Comprehensive protection suite | Includes UVLO (2.92 V nominal), thermal shutdown, cycle-by-cycle current limit, and overvoltage clamp detection |
Applications
| Flyback Regulator | Boost Regulator |
|---|---|
Use Scenario: Isolated 12 V to 48 V DC/DC conversion in DSL modems and telecom line cards with limited board space. IC Role / Device Role / Timing Role: Primary-side PWM controller managing transformer energy transfer, regulating output via optocoupler feedback loop. Use Value: Enables single-chip solution for 15 W isolated output with 700 kHz operation reducing transformer size by ~40% vs. 300 kHz. | Use Scenario: Non-isolated step-up from 12 V battery to 24 V rail in industrial sensors and programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency boost controller driving external Schottky diode and power inductor; FB pin monitors regulated 24 V output. Use Value: Delivers >90% efficiency at 2 A load using integrated 80 V switch, eliminating need for external high-side FET and level-shifting circuitry. |
| Forward Regulator | Distributed Power Converter |
Use Scenario: 48 V input to 5 V/3.3 V dual-output forward converter in base station power modules. IC Role / Device Role / Timing Role: Synchronous rectifier-compatible controller with precise duty cycle control (85–90%) and fast transient response. Use Value: Supports high-density design with 300 kHz operation balancing core loss and conduction loss in ferrite-based transformers. | Use Scenario: Intermediate bus converter supplying multiple point-of-load regulators in network switches and servers. IC Role / Device Role / Timing Role: Primary-side controller managing bulk conversion from 48 V backplane to 12 V intermediate bus with remote ON/OFF via SHDN pin. Use Value: Enables centralized power sequencing and fault isolation through dedicated shutdown pin and thermal protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5002MTC | Higher 100 V switch rating; same 300/700 kHz frequency select; identical pinout and compensation architecture | Supports wider input range up to 75 V; suitable for 60 V industrial buses or automotive cold-crank scenarios | Select LM5002MTC when input voltage may exceed 40 V or higher breakdown margin is required |
| UCC28C43DR | Fixed 1 MHz frequency; no integrated switch; requires external MOSFET; lower 30 V max input | Targets ultra-compact non-isolated buck-boost or SEPIC designs where board space is critical and input is ≤24 V | Choose UCC28C43DR only for low-input, fixed-frequency, external-FET applications - not drop-in compatible |
Compared with LM5000-3MTC, LM5002MTC offers higher voltage headroom while maintaining pin and function compatibility, whereas UCC28C43DR trades integration for frequency stability and smaller footprint but requires redesign of power stage and layout.
Availability
LM5000-3MTC is available at Aetrix Electronics and suitable for flyback regulators, boost converters, forward power supplies, and distributed power converters requiring stable component supply across industrial, telecom, and embedded control applications.
Supply support for LM5000-3MTC 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 digital signal solutions for industrial, automotive, and communications markets.
The LM5000 product line was designed specifically for high-voltage, medium-power DC/DC conversion in space-constrained flyback, boost, and forward topologies - emphasizing integration, thermal robustness, and ease of loop compensation.
FAQ
What is the maximum input voltage supported by the LM5000-3MTC?
The LM5000-3MTC supports an operating input voltage range of 3.1 V to 40 V. Its internal NMOS switch has an 80 V breakdown rating, allowing safe operation with transient spikes up to 80 V on the SW pin - critical in flyback designs where reflected voltages may exceed VIN. Absolute maximum VIN is 40 V; exceeding this risks permanent damage to the bias circuitry.
How does the FS pin configure switching frequency on the LM5000-3MTC?
The FS pin on the LM5000-3MTC selects between two discrete frequencies: grounding FS sets 300 kHz operation, while leaving it open (high-impedance) selects 700 kHz. This configuration is implemented internally via comparator thresholds and does not require external resistors. The LM5000-3MTC datasheet specifies typical fSW values of 240–360 kHz (FS = 0 V) and 550–840 kHz (FS = open), with temperature and VIN variation accounted for in the Electrical Characteristics table.
Can the LM5000-3MTC be used in a non-isolated boost configuration?
Yes, the LM5000-3MTC is explicitly qualified for boost regulator applications per its datasheet Applications section and Typical Application Diagrams (Figures 19–20). In boost mode, the internal NMOS switch connects between VIN and the inductor, with the diode and output capacitor completing the path. The device's 80 V switch rating supports output voltages up to ~75 V (accounting for diode drop), and its current-mode control ensures stable regulation across load and line variations.
What is the purpose of the four PGND pins on the LM5000-3MTC?
The LM5000-3MTC allocates four dedicated PGND pins (pins 5–8) to minimize power-ground impedance and reduce voltage spikes during high di/dt switching events. These pins carry peak inductor current and switch-node return current, and their parallel connection lowers effective resistance and inductance - improving EMI performance, preventing ground bounce, and enhancing current-limit accuracy. Proper PCB layout requires tying all four pins directly to a solid ground plane beneath the IC.
Does the LM5000-3MTC include built-in slope compensation for current-mode control?
Yes, the LM5000-3MTC integrates fixed slope compensation to stabilize current-mode control above 50% duty cycle - a known instability condition in boost and flyback topologies. This internal ramp is summed with the sensed switch voltage before comparison to the COMP pin voltage, eliminating the need for external slope generation circuitry. The datasheet confirms this functionality in the DESCRIPTION and BOOST REGULATOR OPERATION sections, and typical performance curves show stable operation up to 90% duty cycle.
LM5000-3MTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- 80V (Switch)
- Current - Output:
- 1.35A (Switch)
- Frequency - Switching:
- 300kHz, 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
LM5000-3MTC FAQ
1.How can I place an order for LM5000-3MTC through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000-3MTC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM5000-3MTC reliable?
The price and inventory of LM5000-3MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5000-3MTC is usually 5 days.
3.What payment methods are accepted for LM5000-3MTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000-3MTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000-3MTC?
LM5000-3MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000-3MTC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM5000-3MTC?
For technical support, including LM5000-3MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000-3MTC requirements.
6.How does Aetrix verify that LM5000-3MTC is sourced from the original manufacturer or authorized distributors?
All LM5000-3MTC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM5000-3MTC meets industry standards.
7.What is the process for return or replacement of LM5000-3MTC?
All LM5000-3MTC units undergo pre-shipment inspection (PSI). If there is an issue with LM5000-3MTC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM5000-3MTC part is unused and in its original packaging.
Return procedure for LM5000-3MTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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