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Texas Instruments LM5001MAX/NOPB
- Part No.:
- LM5001MAX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5001MAX/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,048
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Product details
Overview
LM5001MAX/NOPB from Texas Instruments is a high-voltage current-mode PWM controller with integrated 75-V, 1-A peak-rated N-channel MOSFET, designed for boost, flyback, SEPIC, and forward converter topologies. It operates from 3.1 V to 75 V input, delivers adjustable output voltage with 1.26 V internal reference, supports up to 1.5 MHz switching frequency via RT resistor, and includes cycle-by-cycle current limiting and thermal shutdown. It is used in industrial DC-DC power supplies where wide VIN range and high reliability are required.
For engineers reviewing the LM5001MAX/NOPB datasheet, LM5001MAX/NOPB pinout, LM5001MAX/NOPB application, or LM5001MAX/NOPB equivalent, key selection criteria include its 75-V integrated MOSFET RDS(on), 1.26 V feedback reference accuracy (±1.5%), 85% max duty cycle limit, EN pin dual-threshold UVLO/standby control, and compatibility with isolated opto-coupled feedback architectures.
Technical Context
The LM5001MAX/NOPB implements peak current-mode control with internal slope compensation (450 mV ramp) to prevent sub-harmonic oscillation above 50% duty cycle. Its PWM comparator compares COMP voltage against a scaled current sense signal (1.05 V/A) plus slope ramp, while cycle-by-cycle limiting triggers at 1 A peak MOSFET current using a 50 mΩ internal sense resistor amplified 30×.
It integrates a high-voltage bias regulator that tracks VIN up to 6.9 V then regulates VCC at 6.9 V (±3%), delivering up to 20 mA. The EN pin provides three operational states-shutdown (<0.45 V), standby (0.45–1.26 V), and full enable (>1.26 V)-with 100 mV hysteresis per threshold and internal 6 µA pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 75 V - supports direct connection to 48 V telecom, 24 V industrial, and high-voltage battery systems without pre-regulation. |
| Integrated MOSFET | 75-V N-channel, 800 mΩ max RDS(on) - enables compact high-voltage converters without external switch; rated for 1-A peak current. |
| Feedback Reference | 1.260 V ±1.5% - enables precise output regulation; used with external resistor divider to set output voltage in non-isolated designs. |
| Switching Frequency | 50 kHz to 1.5 MHz - set by single RT resistor; allows optimization of size vs. efficiency; supports external synchronization via RT pin. |
| Max Duty Cycle | 85% - limits minimum off-time for stable operation in boost/flyback; prevents instability at high input-to-output ratios. |
| Current Limit Threshold | 1.0 A typical peak - provides inherent short-circuit protection and soft-start capability via controlled current ramp. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects die during overload or poor heatsinking; maintains VCC regulator functionality during shutdown. |
Pinout & Package
LM5001MAX/NOPB is packaged in SOIC-8 (4.9 mm × 3.91 mm) with exposed pad not present - distinct from WSON-8 variant. Pin functions are electrically identical across SOIC packages per TI SNVS484H datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Power switch drain node | Connects to MOSFET drain; carries high dv/dt switching waveform; requires minimized loop area with GND for EMI control. |
| 2 (VIN) | Main input supply | Accepts 3.1–75 V; powers internal circuitry and MOSFET gate drive; must be bypassed near pin with ≥0.47 µF ceramic capacitor. |
| 3 (VCC) | Bias regulator output/input | Internally regulated to 6.9 V (up to 20 mA); can accept external 7–12 V supply to improve efficiency in high-VIN applications. |
| 4 (GND) | Analog and power ground | Reference for FB, COMP, RT, EN; return path for MOSFET current sense; must be low-impedance star point for stability. |
| 5 (RT) | Oscillator timing/sync input | Resistor-to-GND sets frequency (50 kHz–1.5 MHz); accepts AC-coupled sync pulses >2.6 V peak for external clock alignment. |
| 6 (FB) | Error amplifier inverting input | Compares output voltage (via divider) against 1.26 V reference; grounded in isolated designs to enable opto-coupler feedback. |
| 7 (COMP) | Error amplifier output | Drives external Type II compensation network; open-drain compatible with opto-coupler collector in isolated configurations. |
| 8 (EN) | Enable/UVLO/standby control | Three-state logic: <0.45 V = shutdown (95 µA IQ), 0.45–1.26 V = standby (VCC on, PWM off), >1.26 V = full operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75-V MOSFET | Eliminates external high-voltage switch, reducing BOM count and layout complexity in boost/flyback designs up to 75 V input. |
| Ultra-wide 3.1 V–75 V input range | Enables single-design reuse across 12 V, 24 V, 48 V, and battery-backed industrial systems without input stage redesign. |
| Adjustable switching frequency (50 kHz–1.5 MHz) | Permits optimization of magnetic size (lower f) vs. efficiency/noise (higher f); RT resistor tolerance directly impacts frequency accuracy. |
| 1.26 V ±1.5% internal reference | Ensures tight output regulation tolerance without external reference IC; reduces drift-related error in temperature-varying environments. |
| Dual-threshold EN pin with hysteresis | Supports programmable undervoltage lockout and remote shutdown via resistor divider or open-drain control, improving system-level safety. |
| Slope-compensated current-mode control | Prevents sub-harmonic oscillation in continuous conduction mode (CCM) above 50% duty cycle, enabling stable high-ratio conversion. |
Applications
| Industrial 48 V DC-DC Supply | Automotive LED Driver |
|---|---|
|
Use Scenario: Step-up conversion from 12 V vehicle battery to 48 V rail for adaptive lighting or camera systems. IC Role / Device Role / Timing Role: Primary PWM controller in boost topology; regulates 48 V output using current-mode feedback and RT-set 500 kHz switching. Use Value: Integrated 75-V MOSFET eliminates need for external high-side switch; EN pin enables ignition-synchronized startup and load-dump-safe shutdown. |
Use Scenario: Constant-current LED driver for headlamps requiring dimming and fault protection in harsh automotive environments. IC Role / Device Role / Timing Role: Flyback controller with primary-side sensing; uses FB/COMP loop for current regulation and thermal foldback. Use Value: 165°C thermal shutdown and cycle-by-cycle current limiting protect LEDs and PCB during overtemperature or short-circuit events. |
| Telecom Boost Converter | Isolated Medical Power Supply |
|
Use Scenario: Generating +56 V from -48 V telecom bus for PoE++ or RF amplifiers in base station equipment. IC Role / Device Role / Timing Role: Boost controller operating at 300 kHz; leverages wide VIN range to accept negative input with proper level-shifting. Use Value: 75 V absolute max rating accommodates line transients on -48 V bus; VCC tracking enables efficient start-up without auxiliary winding. |
Use Scenario: 5 W isolated DC-DC module for patient-connected devices requiring reinforced insulation and low leakage current. IC Role / Device Role / Timing Role: Flyback controller with opto-coupler feedback; FB grounded, COMP driven by opto-transistor collector. Use Value: COMP open-circuit voltage (4.8–6.2 V) ensures reliable opto-driver saturation; 1.26 V reference enables accurate secondary-side regulation. |
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 |
|---|---|---|---|
| LM5122MH/NOPB | Wide-input synchronous controller (no integrated FET); supports up to 100 V; requires external high-side MOSFET. | Used in higher-efficiency, higher-power (>50 W) boost/flyback where synchronous rectification or discrete FET optimization is needed. | Select when higher efficiency, lower thermal stress, or custom FET selection outweighs BOM simplicity of integrated switch. |
| UCC28C42DR | BiCMOS current-mode controller (no integrated FET); 16–110 V input; fixed 1-MHz oscillator; no VCC LDO or EN hysteresis. | Targeted at cost-sensitive, fixed-frequency industrial SMPS where external bias and simple enable logic suffice. | Choose for legacy designs or where external 12 V bias is available and dual-threshold EN is unnecessary. |
Compared with LM5001MAX/NOPB, LM5122MH/NOPB offers higher input voltage margin and synchronous drive but increases component count and layout complexity, while UCC28C42DR reduces integration and feature set to meet basic controller requirements at lower cost.
Availability
LM5001MAX/NOPB is available at Aetrix Electronics and suitable for industrial DC-DC power supplies, automotive LED drivers, and telecom boost converters requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM5001MAX/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 specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive power solutions.
The LM5001MAX/NOPB belongs to TI's high-voltage DC-DC controller product line, engineered for robust, compact, and efficient non-isolated and isolated power conversion in demanding environments from –40°C to 125°C.
FAQ
What is the maximum input voltage rating for LM5001MAX/NOPB?
The LM5001MAX/NOPB has an absolute maximum input voltage (VIN to GND) rating of 76 V. Operation beyond this value risks permanent damage. In practice, TI recommends limiting steady-state VIN to ≤75 V with adequate transient suppression (e.g., TVS diode and input filter per Figure 14 in SNVS484H) to handle line ringing during load dumps or hot-plug events.
Does LM5001MAX/NOPB support isolated feedback configurations?
Yes, LM5001MAX/NOPB supports isolated feedback via opto-coupler. In such designs, the FB pin is grounded, disabling the internal error amplifier, and the COMP pin is driven by the opto-transistor collector. This configuration leverages the COMP open-circuit voltage (4.8–6.2 V) and sink current (2.5 mA) to ensure reliable opto-driver saturation and stable regulation on the secondary side.
How is the switching frequency set on LM5001MAX/NOPB?
The switching frequency of LM5001MAX/NOPB is set by a single resistor (RT) connected between the RT pin and GND. Using the formula FSW ≈ 13.1 × 10⁹ / (RRT + 83 ns), a 48.7 kΩ resistor yields ~260 kHz. Frequency is adjustable from 50 kHz to 1.5 MHz; the RT pin also accepts externally synchronized clock pulses coupled via a 100 pF capacitor.
What protection features does LM5001MAX/NOPB include?
LM5001MAX/NOPB integrates cycle-by-cycle current limiting (1.0 A peak), thermal shutdown (165°C with 20°C hysteresis), undervoltage lockout (VCC UVLO at 2.8 V), and EN pin–based shutdown/standby control. It also includes leading-edge blanking (50 ns) to suppress MOSFET turn-on current spikes and internal slope compensation to prevent sub-harmonic oscillation.
Can LM5001MAX/NOPB operate with an external VCC supply?
Yes, LM5001MAX/NOPB can accept an external 7–12 V supply on the VCC pin to disable the internal bias regulator. This reduces power dissipation and improves efficiency in high-VIN applications (e.g., 48 V input), provided the external VCC never exceeds VIN or 14 V. The internal VCC LDO shuts off when external voltage exceeds ~6.9 V, and the series pass MOSFET body diode prevents reverse current if VIN drops below VCC.
LM5001MAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 800mA (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
LM5001MAX/NOPB FAQ
1.How can I place an order for LM5001MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5001MAX/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 LM5001MAX/NOPB reliable?
The price and inventory of LM5001MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5001MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5001MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5001MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5001MAX/NOPB?
LM5001MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5001MAX/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 LM5001MAX/NOPB?
For technical support, including LM5001MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5001MAX/NOPB requirements.
6.How does Aetrix verify that LM5001MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5001MAX/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 LM5001MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5001MAX/NOPB?
All LM5001MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5001MAX/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 LM5001MAX/NOPB part is unused and in its original packaging.
Return procedure for LM5001MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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