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Texas Instruments LM5000SD-6/NOPB
- Part No.:
- LM5000SD-6/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM5000SD-6/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,534
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Product details
Overview
LM5000SD-6/NOPB from Texas Instruments is a high-voltage current-mode PWM controller IC designed for flyback, boost, and forward DC/DC power converters. It integrates an 80V/2A NMOS switch, supports 600kHz or 1.3MHz switching (FS pin-selectable), operates from 3.1V to 40V input, and delivers adjustable output voltage via external resistor divider. It is used in DSL modems and distributed power systems requiring compact, high-frequency regulation.
For engineers reviewing the LM5000SD-6/NOPB datasheet, LM5000SD-6/NOPB pinout, LM5000SD-6/NOPB application, or LM5000SD-6/NOPB equivalent, key selection criteria include internal switch voltage rating (80V), dual-frequency operation (600kHz/1.3MHz), thermal shutdown protection, softstart control, and compatibility with flyback/boost topologies under industrial temperature range (−40°C to +125°C).
Technical Context
The LM5000SD-6/NOPB 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 features 150–750 µmho transconductance and 280 V/V gain, with external compensation (COMP pin) enabling loop stability optimization for varying output capacitance and load conditions.
It uses dedicated analog ground (AGND) and power ground (PGND) separation, includes undervoltage lockout (2.74–3.10V turn-on threshold), overtemperature protection, and an external shutdown pin (SHDN) supporting logic-level enable/disable. The FS pin selects between 600kHz (grounded) and 1.3MHz (open) operation - a fixed characteristic of the -6 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 40V - supports wide-input industrial and telecom supplies without external pre-regulation. |
| Internal Switch Rating | 80V breakdown, 2A current limit - enables direct interface with 48V bus or PoE-derived inputs in flyback/boost configurations. |
| Switching Frequency | 600kHz (FS grounded) or 1.3MHz (FS open) - allows trade-off between magnetics size and efficiency in space-constrained designs. |
| Feedback Reference Voltage | 1.259V ±2.5mV - sets precise output regulation accuracy using standard resistor-divider networks. |
| Thermal Shutdown Threshold | 150°C junction temperature - protects against sustained overload or poor heatsinking in enclosed environments. |
| Quiescent Current | 2.5mA typical (non-switching, VIN=12V) - minimizes standby power loss in always-on applications like DSL line cards. |
| RDS(ON) | 160–445mΩ at 1A - determines conduction loss and thermal rise during continuous operation. |
Pinout & Package
LM5000SD-6/NOPB is packaged in a thermally enhanced 16-lead WSON (4mm × 4mm, 0.65mm pitch) with exposed thermal pad connected to system ground plane. Pin count and layout match the TSSOP variant but offer lower θJA (45°C/W vs. 150°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP | Compensation network node | Connects external RC/CC network to stabilize voltage loop; critical for phase margin >45° in boost/flyback designs. |
| FB | Feedback input | Senses divided output voltage; internal 1.259V reference enables precise output regulation. |
| SHDN | Enable/disable control | Open = enabled; grounded = disabled - supports remote power sequencing and fault recovery. |
| AGND / PGND | Analog & power ground | Separate ground paths reduce noise coupling; PGND pins (4×) handle high di/dt return currents. |
| SW | Switch node | Connects to transformer primary or boost inductor; must be routed with low-inductance layout to minimize ringing. |
| BYP | Bypass capacitor connection | Requires 0.1µF ceramic cap to filter internal bias supply and suppress supply noise. |
| VIN | Analog power input | Supplies internal circuitry; RC filter (10Ω + ≥0.1µF) recommended to reject line transients. |
| SS | Softstart timing | External capacitor sets startup ramp time; prevents inrush current and output overshoot. |
| FS | Frequency select | Ground = 600kHz; open = 1.3MHz - configures operating frequency without external clock source. |
| TEST | Factory test | Must be tied to ground in application; no functional role in normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control with slope compensation | Enables stable operation at >50% duty cycle in boost/flyback topologies without external ramp injection. |
| Integrated 80V/2A NMOS switch | Eliminates need for external high-voltage MOSFET and gate driver, reducing BOM count and layout complexity. |
| Pin-selectable dual-frequency operation | 600kHz/1.3MHz selection via FS pin simplifies design reuse across performance tiers without changing IC footprint. |
| External compensation (COMP pin) | Allows full customization of loop dynamics for diverse output capacitors (ceramic, polymer, low-ESR tantalum). |
| Thermal shutdown and UVLO protection | Prevents damage during overtemperature events or brownout conditions; ensures robust start-up and fault recovery. |
Applications
| DSL Modem Power Supply | Flyback Regulator for Industrial Sensors |
|---|---|
Use Scenario: Provides isolated 12V/5V rails from 48V phantom power in DSL line cards with strict EMI and size constraints. IC Role / Device Role / Timing Role: Primary-side PWM controller regulating output via optocoupler feedback; operates at 1.3MHz to shrink transformer and filter components. Use Value: Enables compact, high-density power stage meeting ITU-T G.992.3 emission limits while maintaining ±2% output regulation across line/load variations. | Use Scenario: Generates isolated 5V supply for analog sensor front-ends in factory automation nodes powered from 24V DC bus. IC Role / Device Role / Timing Role: Flyback controller with primary-side sensing; uses 600kHz switching to balance efficiency (>85%) and transformer thermal performance. Use Value: Delivers clean, low-noise 5V rail with <50mVpp ripple, supporting 16-bit ADC accuracy without additional LDO post-regulation. |
| Boost Converter for Telecom Backup | Distributed Power Module in Network Equipment |
Use Scenario: Steps up 12V battery backup to 48V for Ethernet switches during AC failure, requiring fast transient response. IC Role / Device Role / Timing Role: Boost controller with softstart and current limiting; operates at 600kHz to support 10A peak output with minimal inductor size. Use Value: Maintains regulated 48V output during 10ms input dip to 9V, with <100µs recovery from 50% load step due to current-mode architecture. | Use Scenario: Powers FPGA I/O banks and SerDes from intermediate 12V rail in 1U servers, where board space and thermal density are critical. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier controller (used with external MOSFETs); leverages COMP pin for adaptive loop tuning across voltage rails. Use Value: Achieves >92% peak efficiency at 3A load while fitting within 1cm² footprint, reducing thermal hotspots near high-speed interfaces. |
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; same 16-WSON package; 500kHz/1MHz frequency options; no FS pin - fixed frequency. | Preferred for 60V+ input systems (e.g., automotive 48V mild-hybrid); lacks pin-selectable frequency flexibility. | Select when input exceeds 40V or fixed-frequency operation suffices; requires layout change only if frequency re-optimization needed. |
| UCC28C43DR | 80V start-up capability but external MOSFET required; 1MHz max frequency; no integrated softstart or slope compensation. | Suitable for cost-sensitive designs where discrete FET selection is acceptable; demands external compensation design effort. | Choose when BOM cost priority outweighs integration benefits; verify loop stability with external ramp generator for >50% duty cycles. |
Compared with LM5000SD-6/NOPB, LM5002SD/NOPB offers higher voltage headroom but less frequency configurability, while UCC28C43DR reduces integration to lower cost but increases design complexity and component count for equivalent performance.
Availability
LM5000SD-6/NOPB is available at Aetrix Electronics and suitable for DSL modems, industrial sensor power supplies, and telecom backup converters requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM5000SD-6/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 for high-voltage, high-frequency DC/DC controllers targeting space-constrained, efficiency-critical applications in telecommunications, industrial automation, and broadband infrastructure.
FAQ
What is the maximum input voltage supported by the LM5000SD-6/NOPB?
The LM5000SD-6/NOPB supports an operating input voltage range of 3.1V to 40V. Its internal 80V-rated switch allows safe operation with reflected voltages up to 80V on the SW pin, making it suitable for flyback topologies with higher turns ratios. Absolute maximum VIN is 40V - exceeding this may cause permanent damage per the datasheet's absolute maximum ratings table.
How does the FS pin configure switching frequency on the LM5000SD-6/NOPB?
On the LM5000SD-6/NOPB, the FS pin selects between two fixed frequencies: grounding FS sets 600kHz operation, while leaving FS open (high-impedance) selects 1.3MHz. This is a hardwired feature of the -6 variant - unlike the -3 version, it does not support 300kHz or 700kHz. The frequency tolerance is ±15% over temperature and line conditions as specified in the Electrical Characteristics table.
Can the LM5000SD-6/NOPB be used in a non-isolated boost configuration?
Yes, the LM5000SD-6/NOPB is explicitly validated for non-isolated boost regulator applications per its Applications section and Figure 19–20. It regulates output voltage using current-mode control, feedback via FB pin, and external compensation on COMP. Designers must ensure the inductor value meets minimum stability criteria for >50% duty cycle and that output capacitor ESR is minimized to maintain loop stability.
What is the purpose of the exposed thermal pad on the LM5000SD-6/NOPB WSON package?
The exposed thermal pad on the LM5000SD-6/NOPB WSON package must be soldered to the PCB's solid ground plane to achieve the specified θJA of 45°C/W. This thermal path significantly improves power dissipation capability versus the TSSOP variant (150°C/W), allowing higher continuous output current without thermal shutdown - especially critical in 1.3MHz operation where switching losses dominate.
Does the LM5000SD-6/NOPB include built-in slope compensation?
Yes, the LM5000SD-6/NOPB integrates slope compensation to prevent subharmonic oscillation in current-mode control when duty cycle exceeds 50%. This eliminates the need for external ramp generation circuitry. The internal ramp is summed with the switch-node voltage before comparison to the COMP pin voltage - a key detail confirmed in the BOOST REGULATOR OPERATION section and block diagram.
LM5000SD-6/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:
- 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/NOPB FAQ
1.How can I place an order for LM5000SD-6/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000SD-6/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-6/NOPB reliable?
The price and inventory of LM5000SD-6/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-6/NOPB is usually 5 days.
3.What payment methods are accepted for LM5000SD-6/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000SD-6/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000SD-6/NOPB?
LM5000SD-6/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000SD-6/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-6/NOPB?
For technical support, including LM5000SD-6/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000SD-6/NOPB requirements.
6.How does Aetrix verify that LM5000SD-6/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5000SD-6/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-6/NOPB meets industry standards.
7.What is the process for return or replacement of LM5000SD-6/NOPB?
All LM5000SD-6/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5000SD-6/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-6/NOPB part is unused and in its original packaging.
Return procedure for LM5000SD-6/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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