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Texas Instruments LM5000SDX-6
- Part No.:
- LM5000SDX-6
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM5000SDX-6.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,021
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Product details
Overview
LM5000SDX-6 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 600kHz or 1.3MHz switching via FS pin selection, features adjustable output voltage (via 1.259V feedback reference), external compensation, softstart, and input undervoltage lockout - enabling compact, efficient isolated and non-isolated power supplies in DSL modems and distributed converters.
For engineers reviewing the LM5000SDX-6 datasheet, LM5000SDX-6 pinout, LM5000SDX-6 application, or LM5000SDX-6 equivalent, key selection considerations include its dual-frequency capability (600kHz/1.3MHz), 3.1V–40V input range, thermal shutdown protection, and compatibility with TSSOP-16 and WSON-16 packages for layout flexibility in space-constrained designs.
Technical Context
The LM5000SDX-6 implements current-mode PWM control with cycle-by-cycle current limiting and built-in slope compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier (transconductance: 150–750 µmho) drives the COMP pin for loop stabilization using external RC/CC networks.
Switching frequency is selected by the FS pin: grounded for 600kHz (typ), open for 1.3MHz (typ); minimum on-time is 165ns. Protection includes overtemperature shutdown, input UVLO (2.74–3.10V turn-on), and overvoltage clamping at COMP (0.67V trip).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 40V - supports wide-input industrial and telecom rails without pre-regulation. |
| Internal Switch Rating | 80V breakdown, 2A current limit - enables direct interface with 48V bus or PoE-derived inputs in flyback/boost stages. |
| Switching Frequency | 600kHz (FS = GND) or 1.3MHz (FS = open) - allows trade-off between magnetics size and efficiency in high-density designs. |
| Feedback Reference | 1.259V ±2.5mV - precise setpoint for stable output regulation across temperature (−40°C to +125°C). |
| Quiescent Current | 2.1–2.5mA (non-switching, VIN=12V) - low bias draw extends standby efficiency in always-on systems. |
| Thermal Resistance (WSON) | 45°C/W - thermally enhanced package supports >2W dissipation without external heatsink in typical PCB layouts. |
| Softstart Current | 8–14µA - sets controlled ramp-up time with external capacitor; prevents inrush stress on input capacitors and transformer. |
Pinout & Package
LM5000SDX-6 is available in a 16-lead WSON package (4mm × 4mm, 0.65mm pitch) with exposed thermal pad. The package provides low thermal resistance (θJA = 45°C/W) and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP | Voltage error amplifier output | Connects to external RC/CC compensation network; determines loop stability and transient response. |
| FB | Feedback input | Monitors output via resistor divider; regulates output to 1.259V reference with ±0.04%/V line regulation. |
| SHDN | Enable/disable control | Open = enable; grounded = disable; draws only −1 to −2µA when active-low asserted. |
| AGND / PGND | Analog & power ground | Separate ground pins minimize noise coupling; AGND must connect directly to PGND at single point. |
| SW | Switch node | Connects to transformer primary or boost inductor; handles up to 80V off-state voltage and 2A peak current. |
| BYP | Bypass capacitor connection | Requires 0.1µF ceramic capacitor to AGND for internal bias supply filtering. |
| VIN | Analog power input | Supplies internal circuitry; recommended RC filter (10Ω + ≥0.1µF) suppresses line transients. |
| SS | Softstart timing | External capacitor charged by 8–14µA current source sets startup ramp duration. |
| FS | Frequency select | Ground = 600kHz; open = 1.3MHz - configures oscillator without external components. |
| TEST | Factory test | Must be connected to ground in application; no user function. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control with slope compensation | Enables stable operation at >50% duty cycle in boost/flyback; eliminates need for external ramp generator. |
| Adjustable switching frequency (600kHz / 1.3MHz) | Allows optimization of magnetic size vs. EMI performance without changing external timing components. |
| Integrated 80V/2A NMOS switch | Reduces BOM count and layout area; eliminates gate driver and discrete FET selection effort. |
| External compensation (COMP pin) | Permits full customization of loop dynamics for diverse output capacitance, load step, and topology requirements. |
| Softstart and UVLO with hysteresis | Ensures controlled startup under varying input conditions and prevents brownout-induced erratic operation. |
Applications
| DSL Modem Power Supply | Distributed Telecom DC/DC |
|---|---|
Use Scenario: Provides isolated 5V/12V bias rails from 48V phantom power in DSLAM line cards and customer premises equipment. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating output via optocoupler feedback; operates at 600kHz to minimize transformer size. Use Value: 80V switch rating withstands 48V input surges; integrated current limit and thermal shutdown ensure robust field operation. | Use Scenario: Generates local 3.3V/5V rails from intermediate 12V or 24V distribution buses in base station subsystems. IC Role / Device Role / Timing Role: Non-isolated boost regulator driving point-of-load converters; configured at 1.3MHz for minimal inductor volume. Use Value: 1.3MHz operation reduces inductor size by >50% vs. 600kHz; WSON package enables high-power density on dense RF boards. |
| Industrial Flyback Converter | Forward Converter for PLC I/O |
Use Scenario: Delivers reinforced-isolation 24V output from 24–36V DC input in programmable logic controller power modules. IC Role / Device Role / Timing Role: Primary-side controller with transformer-coupled feedback; uses FS pin grounded for 600kHz operation balancing efficiency and EMI. Use Value: Input UVLO (2.74–3.10V) ensures reliable start-up during brownouts; 125°C junction rating supports convection-cooled enclosures. | Use Scenario: Supplies isolated 5V logic and 24V sensor excitation from 48V rail in industrial I/O modules with multiple analog/digital channels. IC Role / Device Role / Timing Role: Forward topology controller with synchronous rectification support; leverages external compensation for multi-output regulation stability. Use Value: Adjustable output voltage (via FB divider) enables flexible rail generation; 2A current limit supports high-current auxiliary windings. |
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 | Same family, but fixed 1MHz frequency; no FS pin; higher quiescent current (3.5mA). | Lacks frequency selectability; less flexible for EMI-sensitive or magnetics-optimized designs. | Choose LM5002SDX only if fixed 1MHz simplifies design validation and 600kHz/1.3MHz flexibility is unnecessary. |
| UCC28C43DR | 80V start-up, 1A current limit, no integrated switch; requires external MOSFET; 1MHz max frequency. | Higher system-level design effort due to external FET, gate drive, and protection circuits. | Select UCC28C43DR when higher peak current (>2A) or custom switch SOA is required beyond LM5000SDX-6's integrated device. |
Compared with LM5002SDX and UCC28C43DR, the LM5000SDX-6 uniquely combines dual-frequency selection, integrated 2A/80V switch, and external compensation in a thermally optimized WSON package - delivering lowest component count and fastest time-to-function for medium-power flyback/boost designs.
Availability
LM5000SDX-6 is available at Aetrix Electronics and suitable for DSL modems, distributed telecom power supplies, and industrial flyback converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM5000SDX-6 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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM5000 product line delivers monolithic high-voltage PWM controllers optimized for flyback, boost, and forward topologies in telecom, industrial, and networking equipment where integration, thermal performance, and design simplicity are critical.
FAQ
What is the maximum input voltage supported by the LM5000SDX-6?
The LM5000SDX-6 supports an operating input voltage range of 3.1V to 40V. Its internal 80V-rated NMOS switch allows safe operation with transient voltages up to 80V on the SW pin - making it suitable for applications with input surges, such as 48V telecom systems with line transients. This rating is confirmed in the Absolute Maximum Ratings table (BV = 80V at TJ = 25°C).
How does the FS pin configure switching frequency on the LM5000SDX-6?
On the LM5000SDX-6, the FS pin selects between two switching frequencies: grounding FS sets 600kHz (typ), while leaving FS open sets 1.3MHz (typ). This is distinct from the LM5000-3 variant (300kHz/700kHz). The frequency shift is implemented internally and requires no external timing components - simplifying layout and reducing BOM count compared to oscillator-based controllers.
Can the LM5000SDX-6 be used in a non-isolated boost configuration?
Yes, the LM5000SDX-6 is explicitly qualified for boost regulator applications per its datasheet Applications section and Typical Application Diagrams (Figures 19–20). It regulates output voltage using current-mode control, supports adjustable output via FB pin, and includes all necessary protections (UVLO, thermal shutdown, current limit) for reliable non-isolated operation - provided the input-to-output voltage ratio and duty cycle remain within stable operating limits.
What package options are available for the LM5000SDX-6, and how do they differ thermally?
The LM5000SDX-6 is offered in both 16-lead TSSOP and 16-lead WSON packages. The WSON variant (used in LM5000SDX-6) features an exposed thermal pad and achieves θJA = 45°C/W, significantly lower than the TSSOP's 150°C/W. This enables higher continuous power dissipation without forced air or heatsinking - critical for compact, sealed industrial or telecom enclosures where thermal management is constrained.
Does the LM5000SDX-6 require external slope compensation for stable operation?
No, the LM5000SDX-6 includes built-in slope compensation specifically to prevent subharmonic oscillation in current-mode control at duty cycles above 50%. This eliminates the need for external ramp generation circuitry. However, external compensation via the COMP pin (using RC/CC network) remains essential for overall loop stability, bandwidth, and phase margin tuning - especially with varying output capacitance or load conditions.
LM5000SDX-6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 600kHz, 1.3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WSON (5x5)
LM5000SDX-6 FAQ
1.How can I place an order for LM5000SDX-6 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000SDX-6 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-6 reliable?
The price and inventory of LM5000SDX-6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5000SDX-6 is usually 5 days.
3.What payment methods are accepted for LM5000SDX-6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000SDX-6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000SDX-6?
LM5000SDX-6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000SDX-6 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-6?
For technical support, including LM5000SDX-6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000SDX-6 requirements.
6.How does Aetrix verify that LM5000SDX-6 is sourced from the original manufacturer or authorized distributors?
All LM5000SDX-6 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-6 meets industry standards.
7.What is the process for return or replacement of LM5000SDX-6?
All LM5000SDX-6 units undergo pre-shipment inspection (PSI). If there is an issue with LM5000SDX-6, 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-6 part is unused and in its original packaging.
Return procedure for LM5000SDX-6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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