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Texas Instruments LM5000SDX-3
- Part No.:
- LM5000SDX-3
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM5000SDX-3.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,169
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Product details
Overview
LM5000SDX-3 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, includes external compensation, softstart, and thermal shutdown - used in DSL modems and distributed power converters.
For engineers reviewing the LM5000SDX-3 datasheet, LM5000SDX-3 pinout, LM5000SDX-3 application, or LM5000SDX-3 equivalent, key selection criteria include internal switch voltage rating (80V), current limit (2A typ), frequency select logic (FS pin), feedback reference (1.259V), and thermal resistance (45°C/W in WSON).
Technical Context
The LM5000SDX-3 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 via COMP and FB pins for loop stability tuning.
Switching frequency is determined by the FS pin state (grounded = 300 kHz, open = 700 kHz) and remains stable across −40°C to +125°C junction temperature. Protection includes input undervoltage lockout (2.74–3.10 V turn-on), overtemperature shutdown, and cycle-by-cycle current limiting with 1.35–2.7 A threshold range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Internal Switch Rating | 80V breakdown voltage supports up to 48V output in boost/flyback with margin against reflected transients. |
| Input Voltage Range | 3.1V–40V enables direct operation from 5V, 12V, 24V, or 36V industrial rails without pre-regulation. |
| Switch Current Limit | 2.0A typical limit sets maximum inductor peak current and defines power stage sizing for ≤20W designs. |
| Feedback Reference | 1.259V ±2.5mV ensures precise output regulation; resistor divider determines output voltage per VOUT = 1.259 × (1 + RFB1/RFB2). |
| Switching Frequency | 300kHz (FS grounded) or 700kHz (FS open) allows trade-off between efficiency (lower fSW) and size (higher fSW). |
| Thermal Resistance | 45°C/W (WSON package) enables ≥2.5W dissipation at 125°C max junction temp with minimal heatsinking. |
| Softstart Current | 11µA typ charges external SS capacitor to linearly ramp COMP voltage, controlling startup inrush and output overshoot. |
Pinout & Package
LM5000SDX-3 is packaged in a thermally enhanced 16-lead WSON (4mm × 4mm, 0.65mm pitch) with exposed thermal pad soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP | Voltage error amplifier output | Connects to RC/CC network for loop compensation; sets bandwidth, phase margin, and transient response. |
| FB | Feedback input | Senses resistor-divider output; regulates to 1.259V reference; bias current <200nA minimizes divider error. |
| SHDN | Enable/disable control | Open = active; grounded = shutdown; draws only 30µA when enabled, <1µA in shutdown. |
| AGND / PGND | Analog & power ground | Separate AGND (pins 4) and PGND (pins 5–8) reduce noise coupling; both must connect to low-impedance ground plane. |
| SW | Switch node | Three parallel SW pins (9–11) carry full inductor current; low 160–445mΩ RDS(ON) reduces conduction loss. |
| BYP | Bypass capacitor connection | 0.1µF ceramic decouples internal analog supply; placement near pin critical for noise immunity. |
| VIN | Analog power input | Supplies internal circuitry; RC filter (10Ω + ≥0.1µF) recommended to suppress line glitches. |
| SS | Softstart timing | External capacitor charged by 11µA current source controls ramp rate of COMP voltage during startup. |
| FS | Frequency select | Ground = 300kHz; open = 700kHz; no pull-up/pull-down required due to internal logic. |
| TEST | Factory test | Must be tied to ground in application; floating or driven causes undefined behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80V/2A NMOS switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity in medium-power SMPS. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and excellent line transient rejection without feedforward compensation. |
| Pin-selectable dual-frequency operation | Enables single-footprint design for multiple output power levels-300kHz for higher efficiency, 700kHz for smaller magnetics. |
| External compensation network | Allows full customization of loop dynamics using RC/CC components to stabilize wide-range loads and output capacitors. |
| Thermal shutdown & UVLO | Protects against overtemperature (>150°C) and brownout (turn-on at 2.92V, turn-off at 2.77V), ensuring robust start-up and fault recovery. |
Applications
| DSL Modem Power Supply | Flyback AC-DC Adapter |
|---|---|
Use Scenario: Provides isolated 12V/5V rails from 100–240VAC input via bridge rectifier and bulk cap in compact DSL modem chassis. IC Role / Device Role / Timing Role: Primary-side PWM controller regulating output via optocoupler feedback; operates at 300kHz for EMI compliance and transformer size optimization. Use Value: Integrated 80V switch withstands reflected 600V+ transients; 45°C/W WSON package maintains <115°C die temp under full load without heatsink. | Use Scenario: Generates 5V@2A output from 9–36VDC input in industrial IoT gateway requiring high input range and reliability. IC Role / Device Role / Timing Role: Boost regulator controller with external diode and inductor; uses FS pin open for 700kHz operation to shrink filter components. Use Value: 1.259V reference tolerance (±2.5mV) ensures ±1% output accuracy; softstart prevents inrush into large hold-up capacitors. |
| Distributed Telecom Power | Forward Converter for Base Station |
Use Scenario: Generates isolated 3.3V/10A rail from 48V intermediate bus in telecom shelf with strict thermal constraints. IC Role / Device Role / Timing Role: Forward topology controller driving external synchronous rectifiers; uses 300kHz mode to minimize core loss in ferrite transformer. Use Value: 2A current limit supports peak inductor current up to 12A with margin; PGND pins (4×) reduce ground bounce in high-di/dt switching. | Use Scenario: Supplies 1.8V core voltage to FPGA in 5G base station radio unit with fast load-step requirements. IC Role / Device Role / Timing Role: High-frequency forward controller operating at 700kHz; COMP pin tuned for >60° phase margin at 100kHz crossover. Use Value: External compensation enables optimization for low-ESR polymer output caps; 11µA softstart current ensures controlled 5ms ramp time. |
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 | Higher 100V switch rating; fixed 500kHz fSW; no FS pin; same WSON-16 package. | Supports higher input voltages (e.g., 72V telecom); lacks frequency flexibility; requires redesign if 300/700kHz selection is needed. | Select LM5002SDX only when 100V switch voltage is mandatory and fixed frequency suffices. |
| UCC28C43DR | Controller-only (no integrated switch); 30V max VIN; 1MHz max fSW; SOIC-8 package. | Requires external MOSFET; limited to lower input voltages; better suited for ultra-compact, high-frequency designs where integration is secondary to cost. | Choose UCC28C43DR when discrete switch selection is preferred and input stays below 30V. |
Compared with LM5002SDX and UCC28C43DR, the LM5000SDX-3 uniquely balances integrated 80V switching, dual-frequency flexibility, and WSON thermal performance - making it optimal for 24–48V input, 5–48V output, 5–20W isolated/non-isolated converters where board space and thermal management are critical.
Availability
LM5000SDX-3 is available at Aetrix Electronics and suitable for DSL modems, telecom power supplies, and industrial DC/DC converters requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature.
Supply support for LM5000SDX-3 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 high-reliability products for industrial, automotive, and communications markets.
The LM5000 product line targets high-voltage DC/DC controllers for flyback, boost, and forward converters - designed to simplify power supply design while maintaining efficiency, thermal performance, and protection integrity in space-constrained systems.
FAQ
What is the maximum input voltage supported by the LM5000SDX-3?
The LM5000SDX-3 supports an operating input voltage range of 3.1V to 40V. Its absolute maximum VIN rating is 40V, and exceeding this may cause permanent damage. The device includes undervoltage lockout that disables operation below ~2.77V and enables above ~2.92V, ensuring clean startup. This makes the LM5000SDX-3 suitable for 12V and 24V industrial rails but not for direct 48V bus operation without pre-regulation.
How does the FS pin configure switching frequency on the LM5000SDX-3?
The FS pin on the LM5000SDX-3 selects between two switching frequencies: grounding FS sets 300kHz operation, while leaving FS open (unconnected) configures 700kHz. No external pull-up or pull-down is needed - internal logic detects the state directly. Frequency remains stable across temperature (±10% over −40°C to +125°C), and the choice affects inductor size, EMI profile, and efficiency trade-offs in the final design.
Can the LM5000SDX-3 be used in a flyback configuration with optocoupler feedback?
Yes, the LM5000SDX-3 is explicitly optimized for flyback regulator applications and supports optocoupler-based secondary-side feedback. The FB pin accepts voltage from a resistive divider referenced to the secondary output, and the internal 1.259V reference ensures tight regulation. TI's typical application circuits (e.g., Figure 23) demonstrate this topology with proper compensation and snubber design to manage reflected transients and ringing on the SW node.
What is the purpose of the multiple PGND and SW pins on the LM5000SDX-3?
The LM5000SDX-3 provides four dedicated PGND pins (5–8) and three parallel SW pins (9–11) to minimize impedance in high-current return paths and switch node routing. This reduces ground bounce, improves current sharing, lowers EMI, and enhances thermal dissipation. In practice, all PGND pins must be tied together with short, wide copper pours to the system ground plane, and all SW pins should be routed as a single low-inductance node to the transformer primary or boost inductor.
Does the LM5000SDX-3 include built-in slope compensation for current-mode control?
Yes, the LM5000SDX-3 includes internal slope compensation to ensure stable current-mode operation at duty cycles above 50%. This eliminates subharmonic oscillation without requiring external components. The compensation is automatically scaled with switching frequency and input voltage, enabling reliable operation in boost and flyback topologies where duty cycle can exceed 50%, especially at high input-to-output voltage ratios.
LM5000SDX-3 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:
- 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 FAQ
1.How can I place an order for LM5000SDX-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000SDX-3 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 reliable?
The price and inventory of LM5000SDX-3 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 is usually 5 days.
3.What payment methods are accepted for LM5000SDX-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000SDX-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000SDX-3?
LM5000SDX-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000SDX-3 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?
For technical support, including LM5000SDX-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000SDX-3 requirements.
6.How does Aetrix verify that LM5000SDX-3 is sourced from the original manufacturer or authorized distributors?
All LM5000SDX-3 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 meets industry standards.
7.What is the process for return or replacement of LM5000SDX-3?
All LM5000SDX-3 units undergo pre-shipment inspection (PSI). If there is an issue with LM5000SDX-3, 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 part is unused and in its original packaging.
Return procedure for LM5000SDX-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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