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Texas Instruments LM5000SDX-6/NOPB
- Part No.:
- LM5000SDX-6/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM5000SDX-6/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM5000SDX-6/NOPB from Texas Instruments is a high-voltage current-mode PWM controller IC optimized for boost, flyback, and forward DC/DC converter topologies. It integrates an 80V/2A NMOS power switch, supports pin-selectable 600kHz or 1.3MHz switching, features adjustable output voltage via resistor divider, external compensation, softstart, and input undervoltage lockout - deployed in DSL modems and distributed power converters.
For engineers reviewing the LM5000SDX-6/NOPB datasheet, LM5000SDX-6/NOPB pinout, LM5000SDX-6/NOPB application, or LM5000SDX-6/NOPB equivalent, key selection criteria include internal switch voltage rating (80V), operating input range (3.1V–40V), frequency selectability (FS pin), thermal shutdown behavior, and COMP pin compensation design requirements.
Technical Context
The LM5000SDX-6/NOPB implements peak current-mode control with built-in slope compensation to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier (transconductance: 150–750 µmho) drives the COMP pin, enabling custom loop compensation using RC/CC networks to stabilize against right-half-plane zero effects in boost/flyback configurations.
Switching frequency is determined by the FS pin state (grounded = 600kHz, open = 1.3MHz), with minimum on-time of 165 ns and maximum duty cycle of 85–90%. Protection includes overtemperature shutdown, input UVLO (2.74–3.10 V turn-on), and cycle-by-cycle current limiting (1.35–2.7 A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Internal Switch Rating | 80V breakdown voltage, 2A current limit - enables direct use in 48V-input boost or 400V-output flyback designs without external MOSFET. |
| Input Voltage Range | 3.1V to 40V - supports wide industrial input rails including 12V, 24V, and 36V systems with margin for transients. |
| Switching Frequency | 600kHz (FS grounded) or 1.3MHz (FS open) - allows trade-off between magnetics size and efficiency in space-constrained applications. |
| Feedback Reference | 1.233V–1.284V (typ. 1.259V) - sets precise output regulation accuracy; used with resistor divider to configure output voltage. |
| Softstart Current | 8–14 µA - charges external SS capacitor linearly to control startup dV/dt and limit inrush into output capacitors. |
| Thermal Resistance (WSON) | 45°C/W - enables higher continuous power delivery in thermally enhanced 16-lead WSON package vs. TSSOP (150°C/W). |
| Quiescent Current | 2.0–2.5 mA (non-switching) - defines standby power loss in always-on auxiliary supplies. |
Pinout & Package
LM5000SDX-6/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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COMP (1) | Voltage error amplifier output | Connects to RC/CC compensation network; sets loop stability and transient response in current-mode control. |
| FB (2) | Feedback input | Senses resistor-divider output voltage; regulates output by comparing to 1.259V internal reference. |
| SHDN (3) | Enable/disable control | Open = enabled; grounded = disabled - provides remote ON/OFF capability with <2 µA shutdown current. |
| AGND (4) | Analog ground reference | Must be connected directly to PGND; separates noise-sensitive analog circuitry from high-current power return paths. |
| PGND (5–8) | Power ground terminals | Four dedicated pins reduce ground impedance and minimize voltage spikes during switch transitions. |
| SW (9–11) | Switch node connection | Three parallel pins carry high di/dt switch current to internal NMOS drain; requires low-inductance layout to PGND. |
| BYP (12) | Bypass capacitor node | Connects 0.1µF ceramic capacitor to filter supply noise on internal bias rail. |
| VIN (13) | Analog power input | Supplies internal circuitry; RC filter (10Ω + ≥0.1µF) recommended to suppress line glitches. |
| SS (14) | Softstart timing input | External capacitor charged by 11 µA current source determines ramp time for controlled output voltage rise. |
| FS (15) | Frequency select | Ground = 600kHz; open = 1.3MHz - configures oscillator without external components. |
| TEST (16) | Factory test pin | Must be tied to ground in application; no functional role in normal operation. |
| Exposed Pad | Thermal interface | Connected to PCB ground plane to achieve 45°C/W θJA; critical for thermal performance in WSON package. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 80V/2A NMOS switch | Eliminates need for external high-voltage MOSFET and gate driver in medium-power isolated/non-isolated converters. |
| Pin-selectable 600kHz/1.3MHz operation | Enables optimization of magnetic size vs. efficiency without changing BOM or layout - FS pin replaces external resistor. |
| Current-mode control with slope compensation | Provides inherent line regulation, cycle-by-cycle current limiting, and stable operation up to 90% duty cycle in boost/flyback. |
| Adjustable softstart via external capacitor | Prevents output overshoot and limits inrush current during startup - programmable time constant independent of load. |
| Thermal shutdown and UVLO protection | Shuts down at >150°C junction temperature and disables below 2.74V VIN - prevents damage during fault or brownout conditions. |
Applications
| DSL Modem Power Supply | Distributed Telecom Power |
|---|---|
Use Scenario: Provides isolated 48V/1A output from 12V or 24V intermediate bus in DSL access equipment. IC Role / Device Role / Timing Role: Primary-side flyback controller managing transformer energy transfer, feedback regulation, and safety isolation. Use Value: Internal 80V switch withstands reflected output voltage plus leakage spikes; 1.3MHz option reduces transformer size for compact modem chassis. | Use Scenario: Generates multiple regulated outputs (±12V, 3.3V, 5V) from 48V telecom rectified input in remote radio units. IC Role / Device Role / Timing Role: Forward converter controller driving center-tapped transformer with synchronous rectification support. Use Value: Adjustable FB reference and external compensation enable tight cross-regulation across outputs; thermal pad ensures reliability in sealed enclosures. |
| Industrial Boost Converter | LED Driver for High-Voltage Strings |
Use Scenario: Steps up 24V battery input to 100V for industrial sensor excitation or actuator biasing. IC Role / Device Role / Timing Role: Non-isolated boost regulator controlling inductor current and regulating output via feedback divider. Use Value: 80V SW rating accommodates 100V output minus diode drop; 600kHz operation balances efficiency and EMI filtering component size. | Use Scenario: Drives 30–50V LED strings in architectural lighting fixtures powered from 24V DC distribution. IC Role / Device Role / Timing Role: Constant-current boost controller using FB pin for current-sense amplifier output feedback. Use Value: Precise 1.259V reference enables ±1% LED current accuracy; softstart prevents flash-on-power-up in sensitive lighting environments. |
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/NOPB | Higher 100V switch rating, fixed 500kHz frequency, no FS pin - lacks frequency selectability. | Preferred where input transients exceed 40V or output >60V required; not suitable when 1.3MHz operation needed. | Select LM5002SDX/NOPB only if 100V switch voltage is mandatory and frequency flexibility is unnecessary. |
| UCC28C43DR | External MOSFET required, 30V max VDD, no integrated switch - lower integration but wider VDD range (10–30V). | Used in higher-power (>50W) or higher-efficiency designs where discrete FET selection optimizes conduction losses. | Choose UCC28C43DR when thermal or efficiency targets exceed LM5000SDX-6/NOPB's 2A/80V capability or when custom gate drive is needed. |
Compared with LM5000SDX-6/NOPB, LM5002SDX/NOPB trades frequency flexibility for higher voltage robustness, while UCC28C43DR sacrifices integration for scalability and external FET optimization - making LM5000SDX-6/NOPB optimal for compact 10–30W flyback/boost designs requiring pin-selectable MHz-class switching.
Availability
LM5000SDX-6/NOPB is available at Aetrix Electronics and suitable for DSL modems, distributed telecom power supplies, and industrial boost converters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM5000SDX-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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, precision, and power efficiency.
The LM5000 product line was designed specifically for high-voltage DC/DC conversion in space- and cost-constrained applications such as broadband communications, industrial automation, and distributed power architecture - prioritizing integration, thermal performance, and ease of compensation.
FAQ
What is the maximum output voltage achievable with LM5000SDX-6/NOPB in a boost configuration?
The LM5000SDX-6/NOPB supports boost output voltages up to approximately 78V, calculated as its 80V internal switch breakdown voltage minus diode forward drop (typically 0.5–0.8V). This assumes proper layout, snubbing, and thermal management. Exceeding this limit risks switch avalanche failure. The LM5000SDX-6/NOPB datasheet specifies absolute maximum SW voltage as −0.3V to 80V, and practical design margins require derating.
Does LM5000SDX-6/NOPB support discontinuous conduction mode (DCM) operation?
Yes, LM5000SDX-6/NOPB operates reliably in both continuous and discontinuous conduction modes. Its current-mode control architecture inherently handles DCM transitions without instability. The device maintains regulation down to light loads, and the 1.259V feedback reference ensures accurate output setting regardless of conduction mode - confirmed in TI's typical application circuits and stability analysis guidelines for LM5000SDX-6/NOPB.
How is the softstart time calculated for LM5000SDX-6/NOPB?
The softstart time for LM5000SDX-6/NOPB is determined by the external capacitor on the SS pin and the internal 11 µA (typ.) current source: tSS ≈ CSS × 1.259V / 11 µA. For example, a 100 nF capacitor yields ~11.5 ms ramp time. This linear ramp controls COMP pin voltage rise, preventing output overshoot and limiting inrush - a key design parameter documented in the LM5000SDX-6/NOPB Electrical Characteristics table.
Can LM5000SDX-6/NOPB be used in a flyback converter with primary-side sensing?
No, LM5000SDX-6/NOPB requires optocoupler-based or auxiliary-winding feedback for isolated flyback operation. It does not integrate primary-side sensing or demagnetization detection circuitry. The FB pin must be driven by a voltage derived from the secondary side - either via optocoupler or auxiliary winding with appropriate scaling - to maintain regulation accuracy and safety isolation per LM5000SDX-6/NOPB application schematics.
What is the purpose of the four PGND pins on LM5000SDX-6/NOPB?
The four PGND pins (pins 5–8) on LM5000SDX-6/NOPB provide low-impedance, parallel return paths for high di/dt switch currents, minimizing ground bounce and improving EMI performance. They reduce voltage spikes across internal bond wires during switching transitions, stabilizing the power ground reference for the internal NMOS switch and protecting the analog ground domain - a layout-critical feature explicitly called out in the LM5000SDX-6/NOPB pin description table and thermal design guidelines.
LM5000SDX-6/NOPB 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)
LM5000SDX-6/NOPB FAQ
1.How can I place an order for LM5000SDX-6/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5000SDX-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 LM5000SDX-6/NOPB reliable?
The price and inventory of LM5000SDX-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 LM5000SDX-6/NOPB is usually 5 days.
3.What payment methods are accepted for LM5000SDX-6/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5000SDX-6/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5000SDX-6/NOPB?
LM5000SDX-6/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5000SDX-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 LM5000SDX-6/NOPB?
For technical support, including LM5000SDX-6/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5000SDX-6/NOPB requirements.
6.How does Aetrix verify that LM5000SDX-6/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5000SDX-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 LM5000SDX-6/NOPB meets industry standards.
7.What is the process for return or replacement of LM5000SDX-6/NOPB?
All LM5000SDX-6/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5000SDX-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 LM5000SDX-6/NOPB part is unused and in its original packaging.
Return procedure for LM5000SDX-6/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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