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Texas Instruments LM5000-3MTCX/NOPB
- Part No.:
- LM5000-3MTCX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5000-3MTCX/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM5000-3MTCX/NOPB 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 3.1V–40V input, offers pin-selectable 300kHz/700kHz switching, includes external compensation, softstart, and thermal shutdown - deployed in DSL modems and distributed power converters.
For engineers reviewing the LM5000-3MTCX/NOPB datasheet, LM5000-3MTCX/NOPB pinout, LM5000-3MTCX/NOPB application, or LM5000-3MTCX/NOPB equivalent, key selection considerations include internal switch voltage rating (80V), current limit (2A typ), frequency select logic (FS pin), thermal resistance (45°C/W in WSON), and feedback reference accuracy (1.259V ±2.5mV).
Technical Context
The LM5000-3MTCX/NOPB 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, driving the COMP pin for loop stability tuning via external RC-CC network.
Switching frequency is determined by the FS pin state (grounded = 300kHz, open = 700kHz) with ±10% variation over temperature and input voltage. Protection functions include input undervoltage lockout (2.74–3.10V turn-on threshold), overtemperature shutdown (150°C junction), and cycle-by-cycle current limiting (1.35–2.7A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 40V - supports wide-input industrial and telecom supplies without pre-regulation. |
| Internal Switch Rating | 80V breakdown, 2A current limit - enables direct operation from 48V bus or PoE-derived rails. |
| Switching Frequency | 300kHz (FS grounded) or 700kHz (FS open) - balances efficiency vs. size for magnetics and output caps. |
| Feedback Reference | 1.259V ±2.5mV - sets output voltage precision via resistor divider; enables <±1% regulation at mid-load. |
| Thermal Resistance (θJA) | 45°C/W (WSON package) - allows >2W dissipation at 85°C ambient before thermal shutdown triggers. |
| Quiescent Current | 2.5mA (non-switching, VIN=12V) - minimizes no-load power loss in always-on systems. |
| Softstart Current | 11µA typ - charges external SS capacitor linearly to control inrush and prevent output overshoot. |
Pinout & Package
LM5000-3MTCX/NOPB is packaged in a thermally enhanced 16-lead WSON (4mm × 4mm, 0.65mm pitch) with exposed thermal pad connected to system ground plane. Pin count and function match TI's LM5000-3 family specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (COMP) | Compensation node | Connects to error amp output; RC-CC network here sets loop stability poles/zeros. |
| 2 (FB) | Feedback input | Senses resistor-divider voltage; regulates output by maintaining 1.259V at this pin. |
| 3 (SHDN) | Shutdown control | Open = enable; grounded = disable - enables remote ON/OFF and sequencing control. |
| 4 (AGND) | Analog ground | Reference for FB, COMP, SS; must tie directly to PGND to minimize noise coupling. |
| 5–8 (PGND) | Power ground (x4) | Low-inductance return path for switch current; connects to exposed thermal pad. |
| 9–11 (SW) | Switch node (x3) | High-current output of internal NMOS; connects to transformer primary or boost inductor. |
| 12 (BYP) | Bypass capacitor | 0.1µF ceramic decoupling; stabilizes internal bias rails against switching transients. |
| 13 (VIN) | Analog power input | Supplies internal circuitry; requires RC filter (10Ω + ≥0.1µF) for noise immunity. |
| 14 (SS) | Softstart timing | External capacitor charged by 11µA current source; controls ramp-up of COMP voltage. |
| 15 (FS) | Frequency select | Ground = 300kHz; open = 700kHz - configures oscillator without external components. |
| 16 (TEST) | Factory test | Must be grounded in application; no user function. |
| Exposed Pad | Thermal & electrical ground | Required connection to PCB ground plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80V/2A NMOS switch | Eliminates external high-voltage MOSFET and gate driver; reduces BOM count and layout area. |
| Pin-selectable 300kHz/700kHz operation | Enables single design to support either low-EMI (300kHz) or compact (700kHz) implementations. |
| External compensation (COMP pin) | Allows full control over loop bandwidth, phase margin, and transient response via RC-CC network. |
| Current-mode control with slope compensation | Ensures stable operation at >50% duty cycle without external ramp generator. |
| Softstart and UVLO protection | Prevents inrush current damage and ensures reliable startup only above 2.92V input. |
Applications
| DSL Modem Power Supply | Distributed Telecom DC/DC |
|---|---|
|
Use Scenario: Provides isolated 12V/5V rails from 48V central office supply in ADSL/VDSL line cards. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating output via optocoupler feedback; FS pin set to 700kHz for compact transformer. Use Value: 80V switch withstands reflected 48V transients; 45°C/W θJA sustains operation at 70°C board temperature. |
Use Scenario: Generates point-of-load 3.3V/5V from intermediate 12V or 24V backplane in base station subsystems. IC Role / Device Role / Timing Role: Boost regulator with adjustable output; COMP pin tuned for fast load-step response under dynamic RF PA bias conditions. Use Value: 2A current limit supports >1.5A output; external compensation enables optimization for ceramic output capacitors. |
| Industrial AC/DC Adapter | Medical Auxiliary Power |
|
Use Scenario: Isolated 5V/12V auxiliary supply in programmable logic controllers using universal 85–264VAC input. IC Role / Device Role / Timing Role: Forward converter controller with synchronous rectification drive; FS pin grounded for 300kHz EMI compliance. Use Value: Input UVLO (2.92V) prevents erratic operation during brownouts; thermal shutdown protects against enclosure overheating. |
Use Scenario: Low-noise 3.3V rail for analog front-end and microcontroller in portable diagnostic equipment. IC Role / Device Role / Timing Role: Flyback controller with softstart and shutdown sequencing; FB pin referenced to isolated 1.259V bandgap. Use Value: 1.259V feedback reference enables <±0.5% output tolerance; WSON package meets IPC-610 Class 3 solder joint reliability. |
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 |
|---|---|---|---|
| LM5002MTCX/NOPB | Higher 100V switch rating; same 300kHz/700kHz FS select; identical pinout and compensation architecture. | Supports 60V+ input rails (e.g., 48V PoE++ or automotive transients); otherwise drop-in compatible. | Select when input may exceed 40V or require higher surge margin; retains same layout and compensation. |
| UCC28C43DR | 80V switch, fixed 1MHz frequency, no FS pin; lower quiescent current (1.5mA); different COMP structure (no external slope comp). | Better suited for ultra-compact designs where 1MHz enables smallest magnetics; lacks frequency flexibility. | Choose for space-constrained applications needing fixed high frequency; requires redesign of compensation network. |
Compared with LM5000-3MTCX/NOPB, LM5002MTCX/NOPB extends input voltage headroom while preserving compatibility, whereas UCC28C43DR trades frequency configurability for smaller passive size and lower no-load loss - requiring layout and loop compensation changes.
Availability
LM5000-3MTCX/NOPB is available at Aetrix Electronics and suitable for DSL modems, distributed telecom power, and industrial AC/DC adapters requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LM5000-3MTCX/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 leader delivering analog, embedded processing, and power management solutions with focus on reliability, precision, and energy efficiency.
The LM5000 product line targets high-voltage DC/DC conversion in telecom, industrial, and networking infrastructure - designed to replace discrete MOSFET+controller solutions with integrated, thermally robust, and layout-optimized ICs.
FAQ
What is the maximum input voltage supported by the LM5000-3MTCX/NOPB?
The LM5000-3MTCX/NOPB supports an operating input voltage range of 3.1V to 40V. Absolute maximum rating for VIN is 40V - exceeding this risks permanent damage. The device includes undervoltage lockout that disables operation below 2.74V and re-enables above 2.92V, ensuring clean startup behavior. This range makes LM5000-3MTCX/NOPB suitable for 24V and 36V industrial buses, but not for 48V direct connection without input clamping or pre-regulation.
How does the FS pin configure switching frequency on the LM5000-3MTCX/NOPB?
On the LM5000-3MTCX/NOPB, the FS pin selects between two discrete frequencies: grounding FS sets 300kHz operation (typical 240–360kHz over temp/voltage), while leaving FS open (high-impedance) selects 700kHz (typical 550–840kHz). This configuration requires no external resistors or clocks. The LM5000-3MTCX/NOPB datasheet confirms this behavior is specific to the "-3" variant - the "-6" variant uses different thresholds (600kHz/1.3MHz). No pull-up or pull-down is needed beyond the stated states.
Can the LM5000-3MTCX/NOPB be used in flyback topology with optocoupler feedback?
Yes, the LM5000-3MTCX/NOPB is explicitly validated for flyback regulator use, including configurations with optocoupler-based secondary-side feedback. Its current-mode architecture and COMP pin allow stable loop compensation across wide duty cycles. Figure 23 in the official SNVS176D datasheet shows a complete flyback schematic with TL431 and PC817. The FB pin references the internal 1.259V bandgap, enabling precise regulation regardless of isolation method - making LM5000-3MTCX/NOPB appropriate for medical and industrial isolated supplies.
What thermal performance can be expected from the LM5000-3MTCX/NOPB in WSON package?
The LM5000-3MTCX/NOPB in its 16-pin WSON package has a specified θJA of 45°C/W when mounted on a 2-layer PCB with 1-inch² copper pour connected to the exposed thermal pad. At 85°C ambient and 1.5W dissipation, junction temperature reaches ~152°C - triggering thermal shutdown. Derating is required above 70°C ambient for continuous full-load operation. TI recommends minimum 4 thermal vias (0.3mm diameter) under the pad, connected to inner ground plane, to achieve the published 45°C/W value. This thermal capability exceeds the TSSOP variant (150°C/W) by >3×.
Is the LM5000-3MTCX/NOPB RoHS-compliant and lead-free?
Yes, the LM5000-3MTCX/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (TI's standard designation for lead-free, RoHS-compliant packaging). It meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) and is qualified per TI's automotive-grade reliability standards. The WSON package uses matte tin (Sn) terminal finish, compatible with standard Pb-free reflow profiles (peak 260°C). Full compliance documentation is available in TI's Quality & Environmental section for LM5000-3MTCX/NOPB.
LM5000-3MTCX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LM5000-3MTCX/NOPB FAQ
1.How can I place an order for LM5000-3MTCX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000-3MTCX/NOPB 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 LM5000-3MTCX/NOPB reliable?
The price and inventory of LM5000-3MTCX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5000-3MTCX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5000-3MTCX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000-3MTCX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000-3MTCX/NOPB?
LM5000-3MTCX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000-3MTCX/NOPB 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 LM5000-3MTCX/NOPB?
For technical support, including LM5000-3MTCX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000-3MTCX/NOPB requirements.
6.How does Aetrix verify that LM5000-3MTCX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5000-3MTCX/NOPB 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 LM5000-3MTCX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5000-3MTCX/NOPB?
All LM5000-3MTCX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5000-3MTCX/NOPB, 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 LM5000-3MTCX/NOPB part is unused and in its original packaging.
Return procedure for LM5000-3MTCX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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