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Texas Instruments LM5002SDX/NOPB
- Part No.:
- LM5002SDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5002SDX/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,197
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Product details
Overview
LM5002SDX/NOPB from Texas Instruments is a high-voltage current-mode PWM controller with integrated 75-V/0.5-A N-channel MOSFET, designed for boost, flyback, SEPIC, and forward DC-DC converters. It operates from 3.1 V to 75 V input, delivers 1.26-V ±1.5% feedback reference accuracy, supports up to 1.5 MHz switching frequency, and includes thermal shutdown, cycle-by-cycle current limiting, and oscillator synchronization capability - used in industrial power supplies requiring wide-input regulation.
For engineers reviewing the LM5002SDX/NOPB datasheet, LM5002SDX/NOPB pinout, LM5002SDX/NOPB application, or LM5002SDX/NOPB equivalent, key selection criteria include its 75-V MOSFET rating, 85% max duty cycle, adjustable frequency via RT resistor, EN/UVLO dual-threshold control, and compatibility with isolated opto-coupler feedback topologies.
Technical Context
The LM5002SDX/NOPB implements peak current-mode control with internal slope compensation (450 mV ramp) to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier drives the COMP pin with 72 dB DC gain and 3 MHz unity-gain bandwidth, enabling stable Type-II loop compensation.
It integrates a 75-V bias regulator on VCC that tracks VIN up to 6.9 V then clamps, supports external VCC supply (7–12 V), and features dedicated EN/UVLO comparators with 0.45 V shutdown and 1.26 V enable thresholds plus 100 mV hysteresis per stage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 75 V - enables direct operation from 24 V, 48 V, and 60 V industrial bus rails without pre-regulation |
| Integrated MOSFET | 75-V N-channel, 850 mΩ RDS(on) at TJ = 25°C - eliminates external high-voltage switch in compact boost/flyback designs |
| Feedback Reference | 1.26 V ±1.5% - ensures tight output voltage regulation across –40°C to +125°C junction temperature range |
| Switching Frequency | 50 kHz to 1.5 MHz - set by single RT resistor; allows optimization of size vs. efficiency in space-constrained applications |
| Current Limit | 0.5 A peak - provides cycle-by-cycle overcurrent protection and soft-start capability without external sensing |
| Max Duty Cycle | 85% - supports high step-up ratios in boost and SEPIC topologies while maintaining stability |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed environments |
Pinout & Package
LM5002SDX/NOPB is supplied in an 8-pin SOIC package (4.90 mm × 3.90 mm body) with exposed pad not present - thermal performance relies on PCB copper area under pins 4 (GND) and 6 (FB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Power switch node | Drain terminal of internal 75-V MOSFET - connects directly to inductor/transformer primary; requires low-inductance layout |
| VIN (Pin 2) | Main power input | Accepts 3.1–75 V DC - must be decoupled with low-ESR capacitor near pin; absolute max 76 V |
| VCC (Pin 3) | Bias supply | Internal LDO output (6.9 V regulated) or external 7–12 V input - bypass with ≥0.47 µF ceramic capacitor |
| GND (Pin 4) | Power and signal reference | Common return for MOSFET current sense, error amplifier, and driver logic - star-ground connection recommended |
| RT (Pin 5) | Oscillator control | Resistor-to-GND sets frequency (50 kHz–1.5 MHz); accepts sync pulses >2.6 V via 100 pF AC coupling |
| FB (Pin 6) | Feedback input | Connects to resistive divider from output - referenced to 1.26 V internal bandgap; 10 nA bias current |
| COMP (Pin 7) | Error amplifier output | Open-drain output for Type-II compensation network - internal 5 kΩ pullup enables opto-coupler interface in isolated designs |
| EN (Pin 8) | Enable/UVLO input | Dual-threshold control: <0.45 V = shutdown (95 µA IQ), >1.26 V = full operation - internal 6 µA pullup allows single-resistor UVLO |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-voltage MOSFET | 75-V/0.5-A rated switch eliminates external HV FET and reduces BOM count in boost/flyback designs |
| Adjustable oscillator with sync | Single RT resistor sets frequency; external clock sync enables multi-phase or noise-spread operation |
| Isolated feedback support | COMP pin open-drain output with internal 5-kΩ pullup enables direct opto-coupler collector drive without external bias |
| Dual-level EN/UVLO | Independent 0.45 V shutdown and 1.26 V enable thresholds with 100 mV hysteresis per stage reduce false triggering |
| Internal slope compensation | Fixed 450-mV ramp prevents subharmonic oscillation in >50% duty cycle applications without external components |
Applications
| Industrial Power Supply | Automotive Telematics |
|---|---|
Use Scenario: 48 V battery-fed DC-DC converter powering 5 V/3.3 V logic in factory automation controllers. IC Role / Device Role / Timing Role: Primary-side PWM controller implementing non-isolated boost topology with 75 V input tolerance. Use Value: Eliminates need for pre-regulator stage; 3.1–75 V range accommodates brownout and load-dump transients per ISO 16750-2. | Use Scenario: Isolated flyback supply for GPS/GSM module in vehicle infotainment head unit. IC Role / Device Role / Timing Role: Primary-side controller with opto-coupler feedback driving transformer primary via SW pin. Use Value: COMP pin's internal 5-kΩ pullup enables direct opto-transistor drive - reduces component count and improves creepage/clearance compliance. |
| Telecom Line Card | LED Streetlight Driver |
Use Scenario: 60 V PoE++-derived auxiliary supply generating 12 V for FPGA and PHY ICs. IC Role / Device Role / Timing Role: SEPIC converter providing regulated output during input voltage sag below 36 V. Use Value: 85% max duty cycle and wide 3.1–75 V input enable stable operation across full PoE++ range (57–57 V) and transient dips. | Use Scenario: Constant-current LED driver using boost topology with analog dimming control. IC Role / Device Role / Timing Role: High-side switch controller regulating LED string current via FB voltage scaling. Use Value: 1.26 V ±1.5% reference and 72 dB error amplifier gain ensure <±2% LED current accuracy over line/load/temperature. |
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 |
|---|---|---|---|
| LM5005MX/NOPB | Higher 100-V MOSFET rating; 1.5-A peak current limit; same 8-pin SOIC package | Supports wider input range (3.1–100 V) and higher output power; no change to PCB layout required | Select when input may exceed 75 V or output current >0.5 A is needed |
| UCC28C42DR | External MOSFET required; 30-V VDD max; 1-MHz max frequency; 8-pin SOIC | Requires discrete 75-V FET and gate driver; lower integration but higher flexibility in FET selection | Select when thermal management demands external FET or custom switching characteristics are required |
Compared with LM5002SDX/NOPB, LM5005MX/NOPB extends input voltage and current capability within identical footprint, while UCC28C42DR trades integration for design flexibility - both require revalidation of loop compensation and thermal layout.
Availability
LM5002SDX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive telematics modules, telecom line cards, and LED streetlight drivers requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5002SDX/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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM5002SDX/NOPB belongs to TI's high-voltage DC-DC controller product line, engineered specifically for efficient, compact boost, flyback, SEPIC, and forward converters operating directly from unregulated 24–75 V rails.
FAQ
What is the maximum input voltage rating for the LM5002SDX/NOPB?
The LM5002SDX/NOPB has an absolute maximum input voltage rating of 76 V applied to the VIN pin. Its recommended operating input range is 3.1 V to 75 V. Exceeding 76 V - even transiently due to ringing or load dump - risks permanent damage. Proper input filtering and layout, including low-inductance placement of bulk and ceramic capacitors near VIN and GND, are essential to maintain reliability in high-voltage applications using the LM5002SDX/NOPB.
Does the LM5002SDX/NOPB support isolated power supply designs?
Yes, the LM5002SDX/NOPB supports isolated designs such as flyback converters. Its COMP pin features an open-drain output with an internal 5-kΩ pullup resistor, enabling direct connection to the collector of an opto-coupler transistor - eliminating external bias components. In this configuration, the FB pin is grounded on the primary side, and regulation is performed by a secondary-side error amplifier driving the opto-LED. This architecture is fully supported in the LM5002SDX/NOPB datasheet and reference designs.
How is the switching frequency set on the LM5002SDX/NOPB?
The switching frequency of the LM5002SDX/NOPB is set using a single external resistor (RRT) connected between the RT pin and GND. The relationship is approximated by RRT = 13.1 × 10⁹ / FSW − 83 ns. For example, a 48.7 kΩ resistor yields ~260 kHz. The RT pin also accepts external synchronization pulses (>2.6 V, >15 ns wide) via 100 pF AC coupling, allowing precise timing alignment in multi-converter systems - all while retaining the same RRT resistor.
What protection features does the LM5002SDX/NOPB include?
The LM5002SDX/NOPB integrates multiple protection features: cycle-by-cycle current limiting (0.5 A peak), thermal shutdown at 165°C with 20°C hysteresis, undervoltage lockout on EN pin (0.45 V shutdown, 1.26 V enable), and VCC UVLO (2.8 V turn-on, 2.7 V turn-off). It also includes leading-edge blanking on the current sense path and internal slope compensation to prevent subharmonic oscillation - collectively ensuring robust operation under fault, startup, and transient conditions for the LM5002SDX/NOPB.
Can an external supply be used for the VCC pin of the LM5002SDX/NOPB?
Yes, an external 7 V to 12 V supply can be applied to the VCC pin of the LM5002SDX/NOPB to disable the internal bias regulator, reducing power dissipation and improving overall converter efficiency - especially when VIN significantly exceeds the required VCC voltage. However, the external VCC voltage must never exceed VIN (to avoid reverse current through the internal VCC-to-VIN diode) or 14 V (absolute maximum rating). A ≥0.47 µF ceramic capacitor remains mandatory at the VCC pin for stability.
LM5002SDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Boost, Flyback, Forward Converter, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- 76V (Switch)
- Current - Output:
- 400mA (Switch)
- Frequency - Switching:
- 50kHz ~ 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (4x4)
LM5002SDX/NOPB FAQ
1.How can I place an order for LM5002SDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5002SDX/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 LM5002SDX/NOPB reliable?
The price and inventory of LM5002SDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5002SDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5002SDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5002SDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5002SDX/NOPB?
LM5002SDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5002SDX/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 LM5002SDX/NOPB?
For technical support, including LM5002SDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5002SDX/NOPB requirements.
6.How does Aetrix verify that LM5002SDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5002SDX/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 LM5002SDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5002SDX/NOPB?
All LM5002SDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5002SDX/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 LM5002SDX/NOPB part is unused and in its original packaging.
Return procedure for LM5002SDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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