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Texas Instruments LM5002MAX
- Part No.:
- LM5002MAX
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5002MAX.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,508
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Product details
Overview
LM5002MAX from Texas Instruments is a wide-input-voltage current-mode PWM controller with integrated 75-V/0.5-A N-channel MOSFET, 1.26-V feedback reference, 85% max duty cycle, and programmable oscillator up to 1.5 MHz - designed for high-efficiency boost, flyback, SEPIC, and forward converters in industrial and automotive power supplies.
For engineers reviewing the LM5002MAX datasheet, LM5002MAX pinout, LM5002MAX application, or LM5002MAX equivalent, this page delivers verified package mapping (8-pin SOIC), confirmed thermal specs (RθJA = 105.7°C/W), real-world current limit (0.5 A), oscillator programming method (single RT resistor), and functional alternatives for high-voltage DC-DC design.
Technical Context
The LM5002MAX implements peak current-mode control with internal slope compensation 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 loop compensation via external Type-II networks.
It integrates a 75-V VIN-to-VCC LDO regulator (6.85 V typical output, 20 mA current limit) and dual-threshold EN pin logic (0.45 V shutdown, 1.26 V enable) with 100 mV hysteresis per threshold - supporting precise undervoltage lockout and remote shutdown in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 75 V - supports direct connection to unregulated industrial rails, battery stacks, or automotive systems without pre-regulation. |
| Feedback Reference | 1.26 V ±1.5% - enables accurate output regulation across temperature (–40°C to +125°C) with minimal external components. |
| Current Limit | 0.5 A cycle-by-cycle - protects internal MOSFET and external magnetics during overload or short-circuit events. |
| Oscillator Frequency | 50 kHz to 1.5 MHz - set by single RT resistor; allows optimization of size vs. efficiency in space-constrained designs. |
| Max Duty Cycle | 85% - ensures sufficient off-time for transformer reset in flyback/forward topologies and prevents MOSFET saturation. |
| Thermal Shutdown | 165°C with 20°C hysteresis - disables switching while preserving VCC regulator, enabling safe auto-recovery after cooling. |
| VCC Regulator | 6.85 V ±0.3 V, 20 mA limit - powers internal circuitry and gate drive; accepts external 7–12 V bias to reduce dissipation at high VIN. |
Pinout & Package
LM5002MAX is supplied in an 8-pin SOIC package (4.90 mm × 3.90 mm body, 1.27 mm pitch) with exposed pad not present - thermal performance characterized at RθJA = 105.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Drain terminal of internal 75-V MOSFET; connects directly to inductor/flyback transformer primary; requires low-inductance PCB routing. |
| VIN | Main power input | Accepts 3.1–75 V supply; must be decoupled with low-ESR capacitor near pin to suppress transients and ringing. |
| VCC | Bias regulator output/input | Provides 6.85 V internal bias; can accept external 7–12 V supply to disable internal LDO and improve efficiency at high input voltage. |
| GND | Power and signal reference | Common return for MOSFET current sense, error amplifier, and PWM comparator; must connect to low-impedance ground plane. |
| RT | Oscillator programming | Resistor-to-ground sets switching frequency (50 kHz–1.5 MHz); also accepts sync pulses >2.6 V via 100-pF AC coupling. |
| FB | Feedback input | Connects to resistive divider from regulated output; referenced to 1.26-V internal precision bandgap; bias current <10 nA. |
| COMP | Error amplifier output | Open-drain output driving external compensation network; internal 5-kΩ pullup enables optocoupler biasing in isolated designs. |
| EN | 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 configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75-V MOSFET | Eliminates external high-voltage switch and associated gate-drive complexity in boost/flyback designs. |
| Current-mode control | Enables inherent line feed-forward and simplified loop compensation - no need for external voltage-mode error amplifiers. |
| Programmable oscillator | Single RT resistor sets frequency from 50 kHz to 1.5 MHz, allowing trade-off between magnetic size and EMI performance. |
| Slope compensation | Internal 450-mV ramp prevents subharmonic oscillation in >50% duty-cycle applications without external components. |
| Thermal shutdown with hysteresis | 165°C trip with 20°C recovery gap ensures reliable protection and automatic restart without system-level intervention. |
Applications
| Industrial Power Supplies | Automotive DC-DC Converters |
|---|---|
Use Scenario: 24 V or 48 V bus-powered PLC I/O modules requiring isolated 5 V/3.3 V rails under load dump conditions. IC Role / Device Role / Timing Role: Primary-side PWM controller in flyback topology, regulating output using optocoupler feedback and internal 1.26-V reference. Use Value: 75-V input rating withstands ISO 7637-2 pulse 5a (120 V transient); 0.5-A current limit handles surge loads without latch-off. | Use Scenario: Start-stop battery management system converting 9–16 V nominal to stable 12 V for infotainment head units. IC Role / Device Role / Timing Role: Boost controller maintaining regulated output during cold-crank (6.5 V min) and load-dump (36 V max) events. Use Value: Ultra-wide 3.1–75 V input range covers full automotive battery envelope; EN pin UVLO programmable down to 6.5 V. |
| Telecom Rectifier Modules | High-Voltage Sensor Interfaces |
Use Scenario: 48 V telecom rectifier supplying 54 V intermediate bus for downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: Primary-side controller in forward converter, synchronized to system clock via RT pin for EMI reduction. Use Value: Oscillator synchronization capability aligns switching edges across multiple converters to minimize conducted noise peaks. | Use Scenario: Isolated analog front-end powering 24-bit ADCs and precision op-amps from 40–75 V sensor bus in industrial process control. IC Role / Device Role / Timing Role: SEPIC controller delivering tightly regulated 5 V/±0.5% output with reverse-polarity and overvoltage protection. Use Value: Adjustable output via FB divider; 1.5% output accuracy ensures ADC reference stability; integrated current limiting protects against sensor short circuits. |
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, 2.5-A current limit, fixed 500-kHz frequency - no RT programming or sync capability. | Best for higher-power boost/flyback where fixed frequency simplifies EMI filtering and 100-V rating is mandatory. | Select LM5005MX/NOPB when >0.5-A output current or >75-V input margin is required; not drop-in due to different pinout and no RT/COMP flexibility. |
| UCC28C42DR | 75-V start-up capability but external MOSFET required; 1-MHz max frequency; no integrated VCC regulator - needs auxiliary bias. | Suitable for ultra-high-frequency designs (>500 kHz) where discrete FET selection and layout control outweigh integration benefits. | Choose UCC28C42DR when optimizing for >1-MHz switching or when thermal constraints demand external FET heatsinking; requires additional gate driver and bias circuitry. |
Compared with LM5005MX/NOPB and UCC28C42DR, the LM5002MAX uniquely balances wide input range, programmable frequency, and integrated MOSFET in an SOIC package - making it optimal for medium-power (≤15 W), thermally constrained, and cost-sensitive high-voltage DC-DC designs.
Availability
LM5002MAX is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC converters, and telecom rectifier modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM5002MAX 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 specializing in analog, embedded processing, and power management ICs - with leadership in high-reliability industrial and automotive power solutions.
The LM5002MAX belongs to TI's high-voltage DC-DC controller product line, engineered specifically for efficient, compact, and robust non-isolated and isolated converter topologies operating from 3.1 V to 75 V input rails.
FAQ
What is the maximum input voltage rating for the LM5002MAX?
The LM5002MAX has an absolute maximum input voltage rating of 76 V on the VIN pin, with recommended continuous operation up to 75 V. Exceeding 76 V - including transient spikes from line ringing - risks permanent damage. Proper input filtering and layout are essential to maintain safe operation within this limit. The LM5002MAX datasheet specifies strict derating guidelines for sustained high-voltage use.
Can the LM5002MAX operate with an external VCC supply?
Yes, the LM5002MAX supports external VCC biasing: applying 7–12 V to the VCC pin disables the internal LDO regulator, reducing internal power dissipation and improving overall converter efficiency - especially when VIN exceeds 24 V. The external voltage must never exceed VIN or 14 V, and must remain below the absolute maximum 14 V rating to avoid damaging the internal VCC-to-VIN diode structure.
How is the switching frequency programmed on the LM5002MAX?
The LM5002MAX switching frequency is set using a single resistor (RT) connected between the RT pin and GND. The relationship follows RT = 13.1 × 10⁹ / FSW – 83 ns, supporting 50 kHz to 1.5 MHz. A 48.7-kΩ resistor yields ~260 kHz (typical). The RT pin also accepts external sync pulses >2.6 V via 100-pF AC coupling - enabling EMI reduction through clock alignment in multi-rail systems.
Does the LM5002MAX support isolated feedback configurations?
Yes, the LM5002MAX supports isolated feedback via its COMP pin: grounding the FB pin disables the internal error amplifier, allowing the COMP pin to be driven directly by an optocoupler collector. This configuration is standard in flyback designs where secondary-side regulation is required. The internal 5-kΩ COMP pullup resistor provides bias current for the optocoupler transistor, eliminating need for external pullup components.
What thermal protection features does the LM5002MAX include?
The LM5002MAX incorporates thermal shutdown with a 165°C trip point and 20°C hysteresis - forcing the device into low-power standby while retaining VCC regulator functionality. This allows automatic recovery once die temperature falls below 145°C. The SOIC package has RθJA = 105.7°C/W; proper PCB copper area and thermal vias under the GND pad are critical to achieving rated junction temperature limits in continuous operation.
LM5002MAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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-SOIC
LM5002MAX FAQ
1.How can I place an order for LM5002MAX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5002MAX 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 LM5002MAX reliable?
The price and inventory of LM5002MAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5002MAX is usually 5 days.
3.What payment methods are accepted for LM5002MAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5002MAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5002MAX?
LM5002MAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5002MAX 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 LM5002MAX?
For technical support, including LM5002MAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5002MAX requirements.
6.How does Aetrix verify that LM5002MAX is sourced from the original manufacturer or authorized distributors?
All LM5002MAX 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 LM5002MAX meets industry standards.
7.What is the process for return or replacement of LM5002MAX?
All LM5002MAX units undergo pre-shipment inspection (PSI). If there is an issue with LM5002MAX, 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 LM5002MAX part is unused and in its original packaging.
Return procedure for LM5002MAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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