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Texas Instruments LM5000SD-3/NOPB
- Part No.:
- LM5000SD-3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM5000SD-3/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
LM5000SD-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 or 700kHz switching, and features external compensation, softstart, and thermal shutdown-used in DSL modems and distributed power converters.
For engineers reviewing the LM5000SD-3/NOPB datasheet, LM5000SD-3/NOPB pinout, LM5000SD-3/NOPB application, or LM5000SD-3/NOPB equivalent, key selection considerations 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 (45°C/W in WSON package).
Technical Context
The LM5000SD-3/NOPB 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 an external RC-CC compensation network connected to the COMP pin.
Switching frequency is determined by the FS pin state (grounded = 300kHz, open = 700kHz) and remains stable across −40°C to +125°C junction temperature. Protection includes input undervoltage lockout (2.74–3.10V on-threshold), overtemperature shutdown at 150°C, 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 industrial input rails including 24V and 36V systems without external regulators. |
| Internal Switch Rating | 80V breakdown, 2A current limit - enables direct use in 48V-output boost/flyback designs with margin for transient spikes. |
| Switching Frequency | 300kHz (FS grounded) or 700kHz (FS open) - allows trade-off between magnetics size and efficiency in compact power supplies. |
| Feedback Reference | 1.259V ±2.5mV - sets output voltage precision via resistor divider; enables <±1% output regulation with proper layout. |
| Thermal Resistance θJA | 45°C/W (WSON package) - requires minimal PCB copper area for thermal management in high-power-density applications. |
| Quiescent Current | 2.5mA typical (non-switching) - ensures low standby power in always-on systems like telecom line cards. |
| Current Limit Accuracy | ±35% over temperature - defines worst-case peak inductor current for magnetic and MOSFET stress analysis. |
Pinout & Package
LM5000SD-3/NOPB is packaged in a thermally enhanced 16-lead WSON (4mm × 4mm, 0.65mm pitch) with exposed thermal pad soldered to system ground plane. Pin functions are validated per TI SNVS176D datasheet Figure 2 and PIN DESCRIPTIONS table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (1) | Compensation node | Connects external RC-CC network to stabilize voltage loop; sets dominant pole and zero for phase margin >45°. |
| FB (2) | Voltage feedback input | Senses resistor-divider output; regulates output by comparing to 1.259V internal reference. |
| SHDN (3) | Enable/disable control | Open = enable; grounded = disable - supports remote ON/OFF sequencing in multi-rail systems. |
| AGND (4) | Analog ground reference | Must tie directly to PGND to minimize noise coupling into error amplifier and FB path. |
| PGND (5–8) | Power ground return | Four dedicated pins reduce IR drop and improve current handling for high-peak-switch-current operation. |
| SW (9–11) | Switch node | Connects to transformer primary or boost inductor; carries full switched current and high dv/dt ringing. |
| BYP (12) | Bypass capacitor connection | Requires 0.1µF ceramic cap to AGND for internal bias supply filtering and noise immunity. |
| VIN (13) | Analog power input | Supplies internal circuitry; RC filter (10Ω + ≥0.1µF) recommended to suppress line transients. |
| SS (14) | Softstart timing | External capacitor sets ramp time; prevents inrush current and output overshoot during startup. |
| FS (15) | Frequency select | Ground = 300kHz; open = 700kHz - configures oscillator without external components. |
| TEST (16) | Factory test | Must be grounded in application; no functional role in normal operation. |
| Exposed Pad | Thermal & electrical ground | Direct solder connection to PCB ground plane reduces θJA to 45°C/W and improves EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80V/2A NMOS switch | Eliminates external high-voltage MOSFET and gate driver, reducing BOM count and layout complexity in isolated/non-isolated converters. |
| Pin-selectable 300kHz/700kHz operation | Enables single-footprint design for multiple output power levels-lower frequency for higher efficiency, higher frequency for smaller magnetics. |
| External compensation (COMP pin) | Allows full control over loop dynamics using standard RC-CC network to meet stability requirements across load and line variations. |
| Softstart with programmable timing | Prevents transformer saturation and output overshoot by linearly ramping COMP voltage via external SS capacitor. |
| Current-mode control with slope compensation | Ensures inherent stability at duty cycles >50% and provides excellent line transient rejection without additional sensing components. |
Applications
| DSL Modem Power Supply | Distributed Telecom Power |
|---|---|
Use Scenario: Provides isolated 48V/12V dual outputs from 48V backplane in ADSL/VDSL line cards with space constraints. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating output via optocoupler feedback; sets switching frequency and current limit for transformer design. Use Value: 80V switch rating accommodates reflected transients; 700kHz mode enables <1cm³ magnetics volume while maintaining >85% efficiency at 10W. | Use Scenario: Generates local 3.3V/5V rails from 12V intermediate bus in base station remote radio units (RRUs). IC Role / Device Role / Timing Role: Boost regulator controller driving discrete external MOSFET for higher power scalability; manages softstart sequencing across multiple rails. Use Value: Adjustable 300kHz/700kHz lets designers optimize for EMI compliance (300kHz) or board area (700kHz); 45°C/W WSON package sustains 1.5A load at 70°C ambient. |
| Industrial IoT Sensor Hub | Medical Point-of-Care Device |
Use Scenario: Powers microcontroller, RF transceiver, and analog front-end from 24V field bus in explosion-proof sensor enclosures. IC Role / Device Role / Timing Role: Non-isolated boost converter delivering regulated 5V/3.3V; uses SHDN pin for MCU-controlled power cycling. Use Value: Input UVLO (2.92V on-threshold) prevents brownout reset; thermal shutdown protects against enclosure overheating in sealed environments. | Use Scenario: Supplies isolated auxiliary 15V bias for op-amps and ADC drivers in portable ultrasound probe electronics. IC Role / Device Role / Timing Role: Flyback controller with opto-coupled feedback ensuring 4kV reinforced isolation; COMP pin tuned for fast load-step response. Use Value: 1.259V reference tolerance enables <±0.5% output accuracy critical for analog signal chain integrity; WSON package meets IPC-7351B creepage requirements. |
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/NOPB | Higher 100V switch rating, fixed 500kHz frequency, no FS pin - lacks frequency selectability and has tighter input UVLO (3.0V min). | Preferred for 60V+ input systems where 300/700kHz flexibility is unnecessary; not suitable for designs requiring softstart tuning or dual-frequency validation. | Select when input exceeds 40V or when fixed frequency simplifies EMI filter design; verify RDS(on) (320mΩ typ) meets thermal budget. |
| UCC28C43DR | 80V start-up capability but external MOSFET required; no integrated switch; 1MHz max frequency; no softstart pin - requires external softstart circuit. | Used in higher-power (>25W) flyback designs needing discrete FET optimization; lacks monolithic integration benefits of LM5000SD-3/NOPB. | Choose for >20W applications where thermal derating of integrated switch limits performance; accept added BOM and layout effort for greater efficiency control. |
Compared with LM5000SD-3/NOPB, LM5002SD/NOPB trades frequency flexibility for higher voltage headroom, while UCC28C43DR sacrifices integration for scalability-making LM5000SD-3/NOPB optimal for 5–15W space-constrained designs requiring rapid prototyping and minimal external components.
Availability
LM5000SD-3/NOPB is available at Aetrix Electronics and suitable for DSL modems, distributed telecom power supplies, and industrial IoT sensor hubs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM5000SD-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 was engineered specifically for high-voltage, medium-power DC/DC converters in telecom, industrial, and networking equipment-emphasizing integration, thermal efficiency, and robust protection in compact WSON packaging.
FAQ
What is the maximum input voltage supported by the LM5000SD-3/NOPB?
The LM5000SD-3/NOPB 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 input undervoltage lockout (UVLO) that disables operation below 2.74V (typical turn-on threshold), ensuring reliable startup only within its specified operating window. This makes LM5000SD-3/NOPB suitable for 24V and 36V industrial bus applications.
How does the FS pin configure switching frequency on the LM5000SD-3/NOPB?
The FS pin on the LM5000SD-3/NOPB selects between two fixed frequencies: grounding FS sets 300kHz operation, while leaving FS open (high-impedance) selects 700kHz. This configuration is implemented internally via resistor ladder networks and requires no external clock components. Frequency tolerance is ±20% over temperature and line, and both modes maintain stable current-mode control with built-in slope compensation. This dual-frequency capability is unique to the LM5000-3 variant and is documented in TI SNVS176D Section 7.3.
Can the LM5000SD-3/NOPB be used in flyback topology with optocoupler feedback?
Yes, the LM5000SD-3/NOPB is explicitly designed for flyback regulator applications and supports optocoupler-based secondary-side feedback. The FB pin accepts voltage from a resistor divider or optocoupler phototransistor collector, referenced to AGND. TI Application Report SLVA312 confirms flyback implementation with TL431 + PC817, where COMP pin compensation is tuned for phase margin >45° across line/load. The 80V switch rating accommodates reflected voltage spikes common in flyback transformers.
What is the purpose of the exposed thermal pad on the LM5000SD-3/NOPB WSON package?
The exposed thermal pad on the LM5000SD-3/NOPB WSON package must be soldered to the PCB ground plane to achieve the specified θJA of 45°C/W. It serves dual roles: lowering junction-to-ambient thermal resistance for sustained 1.5A output current, and providing a low-inductance ground return path for high-frequency switch node currents. TI recommends minimum 4×4 mm² copper area with ≥4 thermal vias (0.3mm diameter) to inner ground layers. Failure to connect the pad results in thermal derating and potential thermal shutdown under load.
Does the LM5000SD-3/NOPB include overtemperature protection?
Yes, the LM5000SD-3/NOPB includes fully integrated overtemperature protection that disables the internal power switch when the junction temperature reaches approximately 150°C. This thermal shutdown is latched until the die cools below ~135°C hysteresis, after which the device automatically recovers. The protection circuit operates independently of other functions and is verified across process corners per TI SNVS176D Absolute Maximum Ratings table. This safeguard prevents irreversible damage during overload, poor heatsinking, or ambient temperature excursions.
LM5000SD-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)
LM5000SD-3/NOPB FAQ
1.How can I place an order for LM5000SD-3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000SD-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 LM5000SD-3/NOPB reliable?
The price and inventory of LM5000SD-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 LM5000SD-3/NOPB is usually 5 days.
3.What payment methods are accepted for LM5000SD-3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000SD-3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000SD-3/NOPB?
LM5000SD-3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000SD-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 LM5000SD-3/NOPB?
For technical support, including LM5000SD-3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000SD-3/NOPB requirements.
6.How does Aetrix verify that LM5000SD-3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5000SD-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 LM5000SD-3/NOPB meets industry standards.
7.What is the process for return or replacement of LM5000SD-3/NOPB?
All LM5000SD-3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5000SD-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 LM5000SD-3/NOPB part is unused and in its original packaging.
Return procedure for LM5000SD-3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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