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Texas Instruments LM5000SD-6
- Part No.:
- LM5000SD-6
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM5000SD-6.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,946
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Product details
Overview
LM5000SD-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/1.3MHz selectable switching frequency via the FS pin, operates from 3.1V to 40V input, and delivers adjustable output voltage using external feedback resistors - deployed in DSL modems and distributed power converters.
For engineers reviewing the LM5000SD-6 datasheet, LM5000SD-6 pinout, LM5000SD-6 application, or LM5000SD-6 equivalent, key selection criteria include internal switch voltage rating (80V), dual-frequency operation (600kHz/1.3MHz), softstart control via external capacitor, thermal shutdown protection, and compatibility with TSSOP-16 or WSON-16 packages for space-constrained industrial and telecom power designs.
Technical Context
The LM5000SD-6 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, with COMP pin enabling full external loop compensation via RC/CC network.
It includes dedicated protection circuits: input undervoltage lockout (2.74–3.10V ON threshold), overtemperature shutdown (150°C junction limit), cycle-by-cycle current limiting (1.35–2.7A), and external shutdown control (SHDN pin, active-low). The FS pin selects between 600kHz (FS grounded) and 1.3MHz (FS open) operation - distinct from the LM5000-3 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Internal Switch Rating | 80V breakdown voltage, 2A current limit - enables direct use in 48V-input boost/flyback without external MOSFET. |
| Input Voltage Range | 3.1V to 40V - supports wide-range industrial and telecom inputs including 24V/36V rails. |
| Switching Frequency | 600kHz (FS = GND) or 1.3MHz (FS = open) - higher frequency allows smaller magnetics and faster transient response. |
| Feedback Reference | 1.233V to 1.284V (typ. 1.259V) - sets precise output voltage via resistor divider; low drift supports stable regulation across temperature. |
| Thermal Shutdown | 150°C junction temperature - protects against sustained overload or poor heatsinking in enclosed systems. |
| Softstart Control | External capacitor on SS pin with 8–14µA internal current source - enables controlled ramp-up of output voltage to prevent inrush stress. |
| Quiescent Current | 2.0–2.5mA (non-switching), 18–30µA (shutdown mode) - minimizes standby power loss in always-on applications. |
Pinout & Package
LM5000SD-6 is available in thermally enhanced 16-lead WSON (4mm × 4mm, 0.65mm pitch) and low-profile 16-lead TSSOP packages. Both feature exposed thermal pad (WSON) or thermal pad (TSSOP) connected to system ground for improved heat dissipation.
| 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 | Senses output voltage via resistor divider; regulates output to 1.259V reference. |
| SHDN | Shutdown control | Active-low logic input; grounding disables switching and reduces quiescent current to 18–30µA. |
| AGND / PGND | Analog & power ground | Separate ground pins minimize noise coupling; AGND must connect directly to PGND at single point. |
| SW | Switch node | Drives external transformer primary or boost inductor; handles up to 80V and 2A peak current. |
| BYP | Bypass capacitor connection | Requires 0.1µF ceramic capacitor to stabilize internal bias circuitry and suppress supply noise. |
| VIN | Analog power supply | Supplies internal circuitry; recommended RC filter (10Ω + ≥0.1µF) suppresses line transients. |
| SS | Softstart timing | Capacitor value sets startup time; internal 11µA current source charges it linearly. |
| FS | Frequency select | Ground = 600kHz, open = 1.3MHz - enables dynamic frequency scaling for efficiency vs. size trade-offs. |
| TEST | Factory test | Must be tied to ground in application; no functional role in normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80V/2A NMOS switch | Eliminates need for external high-voltage MOSFET and gate driver in mid-power converters. |
| Current-mode PWM control with slope compensation | Enables stable operation at >50% duty cycle without external compensation components. |
| Pin-selectable dual-frequency operation | 600kHz or 1.3MHz selection via FS pin simplifies design reuse across cost/size/performance variants. |
| Adjustable softstart via external capacitor | Prevents output overshoot and limits inrush current during power-up in sensitive loads. |
| Comprehensive protection suite | Includes UVLO, overtemperature shutdown, cycle-by-cycle current limit, and external shutdown. |
Applications
| DSL Modem Power Supply | Distributed Telecom Power |
|---|---|
Use Scenario: Provides isolated 12V/5V rails from 48V central office feed in DSLAM line cards. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating multiple outputs with tight cross-regulation. Use Value: 80V switch withstands 48V input surges; 1.3MHz operation shrinks transformer size by >40% vs. 300kHz designs. | Use Scenario: Generates local 3.3V/5V supplies for remote PHY and management ICs in fiber access nodes. IC Role / Device Role / Timing Role: Boost regulator stepping up 12V backplane voltage to 24V intermediate bus. Use Value: Internal current limit (2A) and thermal shutdown ensure robustness under short-circuit events in unattended deployments. |
| Industrial AC/DC Adapter | Automated Test Equipment (ATE) Bias Supply |
Use Scenario: Powers PLC I/O modules from 24VDC field bus with ±10% input variation. IC Role / Device Role / Timing Role: Forward converter controller delivering regulated 5V/3A output with low EMI. Use Value: Wide 3.1–40V input range accommodates brownout conditions; FB pin bias current (55–200nA) ensures accuracy with high-value dividers. | Use Scenario: Supplies precision analog circuitry requiring low-noise, fast-settling 15V bias in ATE channel cards. IC Role / Device Role / Timing Role: Boost regulator with external compensation (COMP pin) enabling >100kHz bandwidth loop response. Use Value: Adjustable softstart prevents voltage droop on shared 12V rail during simultaneous channel power-up. |
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 |
|---|---|---|---|
| LM5002SD-6 | Same pinout, 100V switch rating, 3A current limit, higher RDS(on) (220–600mΩ) | Supports higher input voltages (up to 75V) and heavier loads; requires larger output capacitor due to higher ripple. | Select when input exceeds 40V or peak load current >2A; verify thermal margin with WSON package. |
| UCC28C42DR | External MOSFET required, 30V max VDD, no integrated switch, 1MHz max fSW | Offers greater flexibility in switch selection but increases BOM count and layout complexity. | Choose for designs needing >80V switch voltage or custom FET optimization; not drop-in compatible. |
Compared with LM5000SD-6, LM5002SD-6 extends input voltage capability at the cost of higher conduction loss, while UCC28C42DR trades integration for design flexibility - making LM5000SD-6 optimal for compact, cost-sensitive 40V-input flyback/boost systems requiring minimal external components.
Availability
LM5000SD-6 is available at Aetrix Electronics and suitable for DSL modems, distributed telecom power, industrial AC/DC adapters, and automated test equipment requiring stable component supply, long-term manufacturability, and consistent parametric performance across temperature.
Supply support for LM5000SD-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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM5000 product line was engineered specifically for high-efficiency, high-voltage DC/DC conversion in space-constrained telecom and industrial systems - emphasizing integration, thermal robustness, and simplified design through current-mode control and comprehensive protection.
FAQ
What is the maximum input voltage supported by the LM5000SD-6?
The LM5000SD-6 supports an operating input voltage range of 3.1V to 40V. Its internal 80V-rated NMOS switch provides headroom for transient spikes, but sustained VIN must remain ≤40V per absolute maximum ratings. Exceeding 40V risks permanent damage to the VIN and SW pins. Always include input filtering to suppress line glitches, especially in noisy industrial environments where the LM5000SD-6 is commonly deployed.
How does the FS pin configure switching frequency on the LM5000SD-6?
The FS pin on the LM5000SD-6 selects between two fixed frequencies: grounding FS sets 600kHz operation, while leaving FS open (high-impedance) selects 1.3MHz. This differs from the LM5000-3 variant (300kHz/700kHz). The frequency selection directly affects inductor size, output capacitor ESR requirements, and EMI profile - 1.3MHz enables smaller passive components but demands tighter PCB layout for noise control in the LM5000SD-6 design.
Can the LM5000SD-6 be used in flyback topology with primary-side regulation?
Yes, the LM5000SD-6 is explicitly optimized for flyback regulator applications, as confirmed in its datasheet description and typical application circuits. It supports primary-side sensing via auxiliary winding feedback to the FB pin, eliminating the need for optocouplers or secondary-side TL431 circuits. The 1.259V feedback reference and low FB bias current (55–200nA) ensure accurate regulation even with high-resistance divider networks required for isolation in LM5000SD-6 flyback designs.
What thermal considerations apply to the LM5000SD-6 in WSON package?
The LM5000SD-6 in WSON-16 package has θJA = 45°C/W (package only), significantly lower than the TSSOP version (150°C/W). To achieve this, the exposed thermal pad must be soldered to a solid copper ground plane with ≥6 thermal vias. Junction temperature must stay ≤125°C under continuous operation and ≤150°C maximum - exceeding this triggers thermal shutdown. Power dissipation is internally limited, but layout-dependent thermal resistance dominates real-world performance in LM5000SD-6 implementations.
Does the LM5000SD-6 support synchronous rectification?
No, the LM5000SD-6 does not support synchronous rectification. It is designed for use with external diodes (e.g., Schottky or ultra-fast recovery) in boost, flyback, and forward topologies. The SW pin drives only the primary-side switch; there is no gate drive output or timing control for a secondary-side MOSFET. For synchronous designs, engineers should consider TI's UCC2891x or LM5122 families - the LM5000SD-6 relies on conventional diode-based rectification as specified in all its application diagrams and thermal models.
LM5000SD-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)
LM5000SD-6 FAQ
1.How can I place an order for LM5000SD-6 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000SD-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 LM5000SD-6 reliable?
The price and inventory of LM5000SD-6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5000SD-6 is usually 5 days.
3.What payment methods are accepted for LM5000SD-6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000SD-6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000SD-6?
LM5000SD-6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000SD-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 LM5000SD-6?
For technical support, including LM5000SD-6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000SD-6 requirements.
6.How does Aetrix verify that LM5000SD-6 is sourced from the original manufacturer or authorized distributors?
All LM5000SD-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 LM5000SD-6 meets industry standards.
7.What is the process for return or replacement of LM5000SD-6?
All LM5000SD-6 units undergo pre-shipment inspection (PSI). If there is an issue with LM5000SD-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 LM5000SD-6 part is unused and in its original packaging.
Return procedure for LM5000SD-6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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