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Texas Instruments LM5000SDX-3/NOPB
- Part No.:
- LM5000SDX-3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM5000SDX-3/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,655
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Product details
Overview
LM5000SDX-3/NOPB from Texas Instruments is a high-voltage current-mode PWM controller IC designed 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 frequencies, and delivers adjustable output voltage via external resistor divider - deployed in DSL modems and distributed power converters.
For engineers reviewing the LM5000SDX-3/NOPB datasheet, LM5000SDX-3/NOPB pinout, LM5000SDX-3/NOPB application, or LM5000SDX-3/NOPB equivalent, key selection criteria include internal switch breakdown voltage (80V), current limit (2A typ), softstart control via external capacitor, thermal shutdown protection, and compatibility with TSSOP-16 or WSON-16 packages for high-density power designs.
Technical Context
The LM5000SDX-3/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, interfacing with an external RC-CC compensation network connected to the COMP pin.
Switching frequency is selected by the FS pin: grounded for 300 kHz (min 240 kHz, max 360 kHz), open for 700 kHz (min 550 kHz, max 840 kHz). The device includes dedicated UVLO (2.74–3.10 V on-threshold), overtemperature shutdown, and OVP trip at 0.67 V on COMP - all operating across −40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 40 V - supports wide-input industrial and telecom supplies without external pre-regulation. |
| Internal Switch Rating | 80 V breakdown, 2 A current limit - enables direct interface with 48 V bus or PoE-derived inputs in flyback/boost stages. |
| Switching Frequency | 300 kHz (FS = GND) or 700 kHz (FS = open) - allows trade-off between magnetics size and efficiency in space-constrained designs. |
| Feedback Reference | 1.259 V ±2.5 mV - precise reference enables stable output regulation with <0.04 %/V line regulation sensitivity. |
| Quiescent Current | 2.5 mA (non-switching, VIN = 12 V) - low bias current reduces no-load power loss in always-on systems. |
| Thermal Resistance | 45 °C/W (WSON package) - thermally enhanced layout supports >2 W continuous dissipation at TA = 85°C. |
| Softstart Control | 11 µA internal current source charges external capacitor - sets controlled ramp-up of output voltage to limit inrush stress. |
Pinout & Package
LM5000SDX-3/NOPB is packaged in a 16-lead WSON (4 mm × 4 mm, 0.65 mm pitch) with exposed thermal pad. The package supports high-power density layouts and requires solder connection of the exposed pad to system ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (COMP) | Compensation node | Connects to output of error amplifier; external RC-CC network here sets loop stability and transient response. |
| 2 (FB) | Voltage feedback input | Senses divided output voltage; regulated to 1.259 V reference for precise output setpoint control. |
| 3 (SHDN) | Shutdown control | Open = enable, grounded = disable - provides remote ON/OFF capability with <2 µA shutdown current. |
| 4–8 (AGND, PGND×4) | Analog & power ground | Separate AGND and PGND pins minimize noise coupling; all PGND pins must be tied to low-impedance power ground plane. |
| 9–11 (SW×3) | Power switch output | Three paralleled SW pins reduce conduction loss and thermal resistance; connects to transformer primary or boost inductor. |
| 12 (BYP) | Bypass capacitor node | Requires 0.1 µF ceramic capacitor to AGND for internal bias supply decoupling and noise rejection. |
| 13 (VIN) | Analog power input | Supplies internal circuitry; recommends RC filter (10 Ω + ≥0.1 µF) to suppress line transients and improve EMI immunity. |
| 14 (SS) | Softstart timing | External capacitor value determines startup ramp time via 11 µA internal current source. |
| 15 (FS) | Frequency select | Ground = 300 kHz, open = 700 kHz - enables dynamic frequency scaling without changing external components. |
| 16 (TEST) | Factory test | Must be connected to ground in application; not user-accessible for functional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80 V / 2 A NMOS switch | Eliminates need for external high-voltage MOSFET and gate driver, reducing BOM count and layout complexity in isolated/non-isolated converters. |
| Current-mode PWM control with slope compensation | Enables stable operation at duty cycles >50% without external compensation components beyond standard RC-CC network. |
| Adjustable softstart via external capacitor | Prevents output overshoot and limits inrush current during power-up, critical for protecting downstream loads and capacitors. |
| Dual-frequency selection (300 kHz / 700 kHz) | Allows optimization of magnetic component size versus conduction/switching loss trade-offs across varying load and thermal constraints. |
| Comprehensive protection suite | Includes undervoltage lockout (2.74–3.10 V), overtemperature shutdown, and OVP detection on COMP pin - ensures robust field reliability. |
Applications
| DSL Modem Power Supply | Flyback-Based AC/DC Adapter |
|---|---|
|
Use Scenario: Provides isolated 12 V and 5 V rails from universal AC input in residential broadband gateways. IC Role / Device Role / Timing Role: Primary-side controller regulating output via optocoupler feedback; operates in discontinuous conduction mode at light loads. Use Value: 80 V switch rating withstands reflected transients from rectified AC line; 700 kHz option minimizes transformer size for compact modem chassis. |
Use Scenario: Generates 19 V @ 3.5 A for laptop adapters using single-stage flyback topology. IC Role / Device Role / Timing Role: Current-mode controller managing peak primary current and duty cycle to maintain tight output regulation under variable line/load conditions. Use Value: External compensation (COMP pin) enables tuning for high-efficiency operation across 90–264 VAC input range and wide output capacitance variations. |
| Industrial Distributed Power Module | Boost Converter for Telecom Backup |
|
Use Scenario: Generates 48 V intermediate bus from 24 V DC input in programmable logic controller (PLC) backplanes. IC Role / Device Role / Timing Role: Non-isolated boost controller delivering regulated output with current limiting and thermal foldback during overload events. Use Value: 3.1 V minimum input enables operation during brownout conditions; 45 °C/W WSON thermal resistance sustains full load at 70°C ambient. |
Use Scenario: Steps up 24 V battery voltage to 48 V for legacy telecom equipment during AC failure. IC Role / Device Role / Timing Role: High-efficiency boost regulator with softstart and shutdown control synchronized to battery management system signals. Use Value: SHDN pin allows seamless transition between AC and battery modes; 2 A current limit prevents excessive drain on backup battery during fault conditions. |
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 |
|---|---|---|---|
| LM5002SDX/NOPB | Higher 100 V switch rating, fixed 500 kHz frequency, no FS pin - lacks dual-frequency flexibility but supports higher input transients. | Preferred for 48 V+ input systems where 80 V margin is insufficient; not pin-compatible due to different pinout and frequency architecture. | Select LM5002SDX/NOPB when input surge tolerance exceeds 80 V or when fixed 500 kHz simplifies EMI filtering design. |
| UCC28C43DR | 80 V start-up, external MOSFET required, no integrated switch - lower integration but supports >100 V external FETs and wider frequency range (1–1 MHz). | Suitable for ultra-high-efficiency or high-reliability designs requiring discrete switch selection and independent thermal management. | Choose UCC28C43DR when system-level efficiency >92% is mandatory or when long-term availability of discrete 100 V+ MOSFETs is preferred over monolithic integration. |
Compared with LM5000SDX-3/NOPB, LM5002SDX/NOPB trades frequency flexibility for higher voltage headroom, while UCC28C43DR sacrifices integration for greater design control and scalability - making LM5000SDX-3/NOPB optimal for cost-sensitive, space-constrained 30–40 V input converters needing rapid time-to-market.
Availability
LM5000SDX-3/NOPB is available at Aetrix Electronics and suitable for DSL modems, industrial distributed power modules, and telecom backup boost converters requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM5000SDX-3/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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM5000 product line delivers monolithic high-voltage PWM controllers optimized for flyback, boost, and forward topologies - targeting compact, efficient, and robust DC/DC conversion in telecom, industrial, and networking infrastructure.
FAQ
What is the maximum input voltage supported by the LM5000SDX-3/NOPB?
The LM5000SDX-3/NOPB supports an operating input voltage range of 3.1 V to 40 V. Its internal 80 V NMOS switch withstands transient voltages up to 80 V, enabling reliable operation in noisy environments such as telecom or industrial power rails where line spikes may exceed the nominal input. This rating is confirmed in the Absolute Maximum Ratings table of the SNVS176D datasheet.
How does the FS pin configure switching frequency on the LM5000SDX-3/NOPB?
On the LM5000SDX-3/NOPB, the FS pin selects between two switching frequencies: grounding FS sets 300 kHz (typical 300 kHz, min 240 kHz, max 360 kHz), while leaving FS open sets 700 kHz (typical 700 kHz, min 550 kHz, max 840 kHz). This configuration is specific to the -3 variant and differs from the -6 version; no external resistors or clock sources are needed - only the FS pin state determines frequency.
Can the LM5000SDX-3/NOPB operate in continuous conduction mode (CCM)?
Yes, the LM5000SDX-3/NOPB supports both continuous and discontinuous conduction modes. Its current-mode control with built-in slope compensation ensures stability in CCM operation above 50% duty cycle - a requirement verified in the "Inductor Selection" section of the datasheet, which provides equations for minimum inductance to prevent subharmonic oscillation under CCM conditions.
What is the purpose of the TEST pin on the LM5000SDX-3/NOPB?
The TEST pin (Pin 16) on the LM5000SDX-3/NOPB is reserved for factory testing and must be connected to ground in all application circuits. It is not functional in normal operation and has no electrical role in regulation, protection, or control - leaving it floating may cause undefined behavior or reduced reliability per TI's application guidance in the SNVS176D datasheet.
Does the LM5000SDX-3/NOPB require external slope compensation?
No, the LM5000SDX-3/NOPB includes built-in slope compensation to stabilize current-mode control at duty cycles above 50%. Unlike earlier controllers, it does not require an external ramp generator; the internal compensation is automatically enabled and calibrated - confirmed in the "Features" and "BOOST REGULATOR OPERATION" sections of the SNVS176D datasheet.
LM5000SDX-3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- 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-WSON (5x5)
LM5000SDX-3/NOPB FAQ
1.How can I place an order for LM5000SDX-3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000SDX-3/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 LM5000SDX-3/NOPB reliable?
The price and inventory of LM5000SDX-3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5000SDX-3/NOPB is usually 5 days.
3.What payment methods are accepted for LM5000SDX-3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000SDX-3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000SDX-3/NOPB?
LM5000SDX-3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000SDX-3/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 LM5000SDX-3/NOPB?
For technical support, including LM5000SDX-3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000SDX-3/NOPB requirements.
6.How does Aetrix verify that LM5000SDX-3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5000SDX-3/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 LM5000SDX-3/NOPB meets industry standards.
7.What is the process for return or replacement of LM5000SDX-3/NOPB?
All LM5000SDX-3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5000SDX-3/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 LM5000SDX-3/NOPB part is unused and in its original packaging.
Return procedure for LM5000SDX-3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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