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Texas Instruments LM5000SD-3
- Part No.:
- LM5000SD-3
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM5000SD-3.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,110
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Product details
Overview
LM5000SD-3 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, and features external compensation, softstart, and thermal shutdown - deployed in DSL modems and distributed power converters.
For engineers reviewing the LM5000SD-3 datasheet, LM5000SD-3 pinout, LM5000SD-3 application, or LM5000SD-3 equivalent, key selection criteria include internal switch voltage rating (80V), adjustable frequency via FS pin, feedback reference accuracy (1.259V ±2.5mV), current limit tolerance (1.35–2.7A), and thermal resistance in WSON package (45°C/W).
Technical Context
The LM5000SD-3 implements peak current-mode control with built-in slope compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier delivers 280 V/V gain and 150–750 µmho transconductance, interfacing directly with the COMP pin for loop stabilization using external RC/CC networks.
Switching frequency is determined by the FS pin state (grounded = 300kHz, open = 700kHz) and remains stable across −40°C to +125°C junction temperature and 3.1V–40V input range. Protection includes input undervoltage lockout (2.74–3.10V turn-on threshold), overtemperature shutdown, and cycle-by-cycle current limiting with 1.35–2.7A trip range.
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 interface with 48V bus or PoE-derived inputs in flyback/boost |
| Switching Frequency | 300kHz (FS grounded) or 700kHz (FS open) - allows trade-off between magnetics size and efficiency |
| 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) - enables >2W dissipation at 25°C ambient before thermal shutdown |
| Quiescent Current | 2.5mA (non-switching, VIN=12V) - minimizes standby loss in always-on power stages |
| Softstart Current | 8–14µA - controls ramp rate of COMP voltage via external capacitor; prevents inrush in high-capacitance outputs |
Pinout & Package
LM5000SD-3 is packaged in a thermally enhanced 16-lead WSON (4mm × 4mm, 0.65mm pitch) with exposed thermal pad connected to system ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP | Voltage error amplifier output | Connects to RC/CC compensation network; sets loop stability and transient response |
| FB | Feedback input | Senses resistor-divider output; regulates to 1.259V reference; bias current ≤200nA |
| SHDN | Enable/disable control | Open = active; grounded = shutdown; draws ≤30µA when disabled |
| AGND / PGND | Analog & power ground | Separate ground pins minimize noise coupling; AGND must tie directly to PGND star point |
| SW | Switch node | Connects to transformer primary or boost inductor; handles 80V max, 2A peak, with 160–445mΩ RDS(on) |
| BYP | Bypass capacitor connection | 0.1µF ceramic decoupling required; filters supply noise on analog rail |
| VIN | Analog supply input | 3.1–40V input; RC filter (10Ω + ≥0.1µF) recommended for transient suppression |
| SS | Softstart timing | External capacitor charged by 8–14µA current source; defines startup ramp time |
| FS | Frequency select | Ground = 300kHz; open = 700kHz; determines minimum on-time (165ns) and max duty (90%) |
| TEST | Factory test | Must be grounded in application; no user function |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80V/2A NMOS switch | Eliminates external MOSFET and driver; reduces BOM count and layout area in isolated/non-isolated SMPS |
| Pin-selectable dual-frequency operation | 300kHz/700kHz selection via FS pin enables optimization for EMI, size, or efficiency without changing PCB |
| Current-mode control with slope compensation | Enables stable operation at >50% duty cycle in boost/flyback; rejects line transients inherently |
| External compensation network (COMP pin) | Allows full control over loop bandwidth, phase margin, and load-step response using RC/CC components |
| Programmable softstart (SS pin) | Prevents output overshoot and inrush current during power-up; timing set by external capacitor value |
Applications
| DSL Modem Power Supply | Distributed Telecom Power |
|---|---|
Use Scenario: Provides isolated 12V/5V 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; FS pin configured for 700kHz to shrink transformer size. Use Value: 80V switch withstands 48V input surges; 45°C/W θJA maintains reliability in confined chassis; softstart prevents latch-up during hot-swap insertion. | Use Scenario: Generates auxiliary 3.3V/1.8V supplies for FPGA, PHY, and management ICs in modular base station power systems. IC Role / Device Role / Timing Role: Boost regulator stepping up 12V intermediate bus to 24V; operates at 300kHz for lower EMI in dense RF environments. Use Value: Adjustable output via FB divider supports multiple rail requirements; current limit (2A typ.) handles burst-mode loads; UVLO ensures clean start after brownout recovery. |
| Industrial Flyback Converter | High-Voltage Boost Supply |
Use Scenario: Isolated 24V-to-48V conversion for PLC I/O modules requiring reinforced insulation and low leakage. IC Role / Device Role / Timing Role: Flyback controller with transformer turns ratio selected for 48V output; uses external shutdown (SHDN) for system-level power sequencing. Use Value: Thermal shutdown protects against overload in sealed enclosures; 1.259V reference enables ±1.5% output tolerance across temperature; PGND/AGND separation reduces noise in analog sensing circuits. | Use Scenario: Generates 60V bias for GaN gate drivers or sensor excitation in test equipment and medical imaging subsystems. IC Role / Device Role / Timing Role: Non-isolated boost regulator; SW pin drives discrete inductor; COMP pin tuned for high-gain loop to reject 60Hz ripple on 24V input. Use Value: 80V switch rating provides 20V headroom above 60V output; adjustable frequency avoids sensitive bands; external compensation enables fast transient recovery under pulsed loads. |
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 | Higher 100V switch rating; fixed 500kHz frequency; no FS pin; same WSON-16 package | Preferred for >60V input designs (e.g., 72V battery systems); lacks frequency flexibility | Select LM5002SD when input exceeds 40V but frequency tuning is unnecessary |
| UCC28C43DR | 80V start-up capability only; requires external MOSFET; 1MHz max frequency; SOIC-8 package | Suitable for cost-sensitive, lower-power (<15W) boost/flyback where board space permits discrete FET | Choose UCC28C43DR when thermal budget allows larger solution size and higher efficiency is needed via optimized external FET |
Compared with LM5002SD and UCC28C43DR, the LM5000SD-3 uniquely balances integrated 80V/2A switching, pin-selectable frequency, and compact WSON packaging - making it optimal for 30–50W flyback/boost designs where layout density, thermal performance, and design flexibility are critical.
Availability
LM5000SD-3 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 consistent parametric performance across temperature.
Supply support for LM5000SD-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 logic solutions with emphasis on power management, signal chain, and connectivity.
The LM5000 product line targets high-voltage DC/DC controller applications in telecom, industrial, and networking equipment - designed to simplify isolated and non-isolated power stage implementation while maintaining robust protection and thermal performance.
FAQ
What is the maximum input voltage supported by the LM5000SD-3?
The LM5000SD-3 supports an operating input voltage range of 3.1V to 40V. Its internal 80V-rated NMOS switch provides sufficient voltage headroom for transient spikes, but sustained input above 40V violates absolute maximum ratings and risks permanent damage. For 48V bus applications, external clamping or pre-regulation is required before the VIN pin.
How does the FS pin configure switching frequency on the LM5000SD-3?
On the LM5000SD-3, the FS pin selects between two fixed frequencies: grounding FS sets 300kHz operation, while leaving FS open (high-impedance) selects 700kHz. This configuration is latched at power-up and remains stable across temperature and input voltage variations, enabling predictable EMI filtering and magnetics sizing without external clock circuitry.
Can the LM5000SD-3 be used in a flyback topology with optocoupler feedback?
Yes, the LM5000SD-3 is explicitly optimized for flyback regulator applications and supports optocoupler-based secondary-side feedback. The FB pin accepts the optocoupler output to regulate output voltage, while the COMP pin allows full compensation of the control loop - including right-half-plane zero mitigation - ensuring stability across load and line variations per TI's Application Report SLVA258.
What is the purpose of the exposed thermal pad on the LM5000SD-3 WSON package?
The exposed thermal pad on the LM5000SD-3 WSON package must be soldered to the PCB's solid ground plane to achieve the specified 45°C/W junction-to-ambient thermal resistance. Without this connection, θJA degrades significantly (to ~150°C/W), causing premature thermal shutdown under moderate load - especially critical in continuous conduction mode flyback designs.
Does the LM5000SD-3 include built-in slope compensation for current-mode control?
Yes, the LM5000SD-3 integrates fixed slope compensation to stabilize current-mode control above 50% duty cycle - a requirement for reliable boost and flyback operation. This internal ramp eliminates the need for external compensation components while maintaining cycle-by-cycle current limiting and excellent line transient rejection, as confirmed in the Functional Block Diagram and BOOST REGULATOR OPERATION section of the SNVS176D datasheet.
LM5000SD-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)
LM5000SD-3 FAQ
1.How can I place an order for LM5000SD-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000SD-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 LM5000SD-3 reliable?
The price and inventory of LM5000SD-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5000SD-3 is usually 5 days.
3.What payment methods are accepted for LM5000SD-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000SD-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000SD-3?
LM5000SD-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000SD-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 LM5000SD-3?
For technical support, including LM5000SD-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000SD-3 requirements.
6.How does Aetrix verify that LM5000SD-3 is sourced from the original manufacturer or authorized distributors?
All LM5000SD-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 LM5000SD-3 meets industry standards.
7.What is the process for return or replacement of LM5000SD-3?
All LM5000SD-3 units undergo pre-shipment inspection (PSI). If there is an issue with LM5000SD-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 LM5000SD-3 part is unused and in its original packaging.
Return procedure for LM5000SD-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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