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Texas Instruments LM5001MAX
- Part No.:
- LM5001MAX
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5001MAX.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,655
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Product details
Overview
LM5001MAX from Texas Instruments is a high-voltage current-mode switch-mode regulator IC integrating a 75-V, 1-A peak current-limited N-channel MOSFET. It supports Boost, Flyback, SEPIC, and Forward topologies with input range 3.1 V to 75 V, adjustable output voltage (1.26 V reference), and 1.5% output accuracy. Used in industrial DC-DC power supplies requiring wide VIN tolerance and compact high-voltage conversion.
For engineers reviewing the LM5001MAX datasheet, LM5001MAX pinout, LM5001MAX application, or LM5001MAX equivalent, key selection considerations include its integrated 75-V MOSFET RDS(ON) (490–800 mΩ), programmable 50 kHz–1.5 MHz switching frequency via RT resistor, thermal shutdown at 165°C, cycle-by-cycle current limiting, and dual-threshold EN/UVLO control for robust start-up sequencing.
Technical Context
The LM5001MAX employs 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 summed signal of amplified current sense (1.05 V/A) and slope ramp, enabling stable regulation across wide input and load transients.
It integrates a high-voltage bias regulator (VCC LDO) tracking VIN up to 6.9 V, then clamping at 6.9 V; VCC supplies gate drive and internal circuitry with 20 mA current limit. The EN pin provides three-state control: shutdown (<0.45 V), standby (0.45–1.26 V), and full enable (>1.26 V), each with 100 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 75 V - enables direct operation from 12 V, 24 V, 48 V, or unregulated HV rails without pre-regulation |
| Integrated MOSFET | 75-V N-channel, 490–800 mΩ RDS(ON) - eliminates external high-voltage switch, reduces BOM count and layout complexity |
| Switching Frequency | 50 kHz to 1.5 MHz - set by single RT resistor; allows optimization of size (high f) vs. efficiency (low f) |
| Feedback Reference | 1.260 V ±1.5% - precision internal reference enables accurate output regulation with minimal external components |
| Current Limit | 0.8 A to 1.2 A peak - cycle-by-cycle protection prevents MOSFET overcurrent during fault or soft-start |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects die under overload or poor heatsinking; resumes operation after cooling |
| Duty Cycle Limit | 80–90% max - constrains maximum on-time to ensure reliable operation in boost/flyback configurations |
Pinout & Package
LM5001MAX is packaged in SOIC-8 (4.9 mm × 3.91 mm) with exposed pad (EP) connected to GND for thermal enhancement. Pin functions are validated per TI SNVS484H datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Power MOSFET drain node | High-voltage switching node; connects to inductor/transformer primary; requires low-inductance layout |
| 2 (VIN) | Main input supply | Accepts 3.1–75 V; powers internal VCC LDO and MOSFET gate driver; must be bypassed with ≥0.47 µF ceramic |
| 3 (VCC) | Bias regulator output/input | Internally regulated to 6.9 V (for VIN >6.9 V); can accept external 7–12 V supply to reduce dissipation |
| 4 (GND) | Power and signal ground | Reference for current sense, error amplifier, and MOSFET source; tie EP to this plane for thermal performance |
| 5 (RT) | Oscillator programming/sync input | Resistor-to-GND sets frequency; accepts AC sync pulses >2.6 V peak via 100 pF capacitor |
| 6 (FB) | Feedback input | Connects to resistor divider from output; referenced to 1.26 V internal bandgap; 10 nA bias current |
| 7 (COMP) | Error amplifier output | Open-drain output with 5 kΩ internal pull-up; connects to compensation network and opto-coupler in isolated designs |
| 8 (EN) | Enable / UVLO input | Three-level control: <0.45 V = shutdown (95 µA IQ), 0.45–1.26 V = standby (VCC active), >1.26 V = full operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75-V MOSFET | Reduces component count and PCB area; eliminates need for external high-voltage switch and associated gate drive circuitry |
| Ultra-wide 3.1 V–75 V input | Supports direct connection to automotive battery (cold crank), telecom -48 V, industrial 24/48 V, and unregulated HV sources |
| Programmable 50 kHz–1.5 MHz fSW | Enables trade-off between magnetic size (higher f) and conduction loss (lower f); RT resistor simplifies design iteration |
| Internal slope compensation | 450 mV fixed ramp prevents sub-harmonic oscillation in >50% duty cycle applications without external components |
| Dual-threshold EN pin | Allows precise UVLO setting and remote shutdown capability while retaining VCC bias during standby for auxiliary circuitry |
Applications
| Industrial 24 V/48 V DC-DC Supply | Automotive Cold-Crank Boost Converter |
|---|---|
Use Scenario: Converting 24 V or 48 V industrial bus to isolated 5 V/12 V for PLC I/O modules or sensors. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology; regulates output via opto-coupler feedback to COMP pin. Use Value: Integrated 75-V MOSFET withstands 48 V nominal + surge; 1.26 V reference ensures tight output tolerance across temperature. | Use Scenario: Boosting battery voltage during cold-crank (as low as 3.1 V) to maintain 5 V MCU supply in automotive infotainment. IC Role / Device Role / Timing Role: Boost controller with EN pin tied to battery monitor; enters shutdown below 3.1 V to prevent brownout. Use Value: Ultra-low 3.1 V start-up and 1.5% output accuracy sustain critical loads during transient battery dips. |
| Telecom -48 V Forward Converter | Isolated Auxiliary Power for Gate Drivers |
Use Scenario: Generating +15 V/-15 V isolated rails from telecom -48 V input for op-amps and analog front-ends. IC Role / Device Role / Timing Role: Forward converter controller; uses VCC winding for self-bias once regulation is established. Use Value: VCC LDO tracks VIN up to 6.9 V, then clamps-enabling efficient self-bias from -48 V input via transformer auxiliary winding. | Use Scenario: Providing isolated +15 V bias for SiC MOSFET gate drivers in motor drives or inverters. IC Role / Device Role / Timing Role: Flyback controller with secondary-side error amp driving opto-coupler; COMP pin directly interfaces opto collector. Use Value: Open-drain COMP with 5 kΩ pull-up supports direct opto-coupler interface; 165°C thermal shutdown protects gate driver supply under overload. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage switch-mode regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5002MX/NOPB | Higher 100-V MOSFET rating; 2-A peak current limit; same SOIC-8 package | Required for inputs >75 V or higher output power; not drop-in due to different current limit threshold | Select when input exceeds 75 V or peak load current >1.2 A |
| UCC28C43DR | External MOSFET controller only; no integrated switch; 16-V VDD max; requires external bias | Suitable for custom high-efficiency designs where discrete FET selection is preferred; lacks integrated HV switch | Choose for flexibility in FET selection or when >100 V operation is needed with discrete solution |
Compared with LM5001MAX, LM5002MX offers higher voltage headroom but increased cost and footprint; UCC28C43DR provides greater design flexibility and efficiency tuning at the expense of BOM count and layout complexity-neither is pin-compatible, and both require revalidation of loop compensation and thermal design.
Availability
LM5001MAX is available at Aetrix Electronics and suitable for industrial DC-DC power supplies, automotive cold-crank boost converters, and telecom forward converters requiring stable component supply and long-term manufacturability.
Supply support for LM5001MAX 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 connectivity solutions for industrial, automotive, and communications markets.
The LM5001MAX belongs to TI's high-voltage DC-DC controller product line, designed specifically for compact, efficient non-isolated and isolated power conversion from 3.1 V to 75 V input sources.
FAQ
What is the absolute maximum input voltage rating for the LM5001MAX?
The LM5001MAX has an absolute maximum VIN-to-GND rating of 76 V, as specified in Section 6.1 of the SNVS484H datasheet. Operation beyond this voltage-even transiently-can cause permanent damage. Layout best practices, including low-inductance VIN/GND routing and local 0.47 µF ceramic decoupling, are essential to suppress ringing that could exceed this limit during line transients.
Can the LM5001MAX operate with an input voltage as low as 3.1 V, and what happens to VCC in that condition?
Yes, the LM5001MAX operates down to 3.1 V VIN. In this range, the internal VCC LDO regulator tracks VIN closely-so at 3.1 V input, VCC ≈ 3.1 V. The VCC UVLO threshold is 2.8 V (rising), ensuring reliable startup. Once VIN exceeds ~6.9 V, VCC clamps at 6.9 V to protect internal circuitry, and excess input energy is dissipated in the LDO pass element.
How does the EN pin function in the LM5001MAX, and what are its three operational states?
The EN pin on the LM5001MAX implements three distinct states: below 0.45 V it forces shutdown (IQ = 95 µA); between 0.45 V and 1.26 V it enables VCC regulation only (standby mode); above 1.26 V it fully enables PWM operation. Each transition includes 100 mV hysteresis to reject noise. An internal 6 µA pull-up allows default-enable behavior when left floating.
What is the purpose of slope compensation in the LM5001MAX, and how is it implemented?
Slope compensation in the LM5001MAX prevents sub-harmonic oscillation in current-mode control when duty cycle exceeds 50%. It adds a fixed 450 mV triangular ramp (zero at MOSFET turn-on, peaking at end of clock cycle) to the current sense signal before comparison with the COMP voltage. This ensures stable closed-loop behavior without requiring external components or complex compensation adjustments.
Does the LM5001MAX support external clock synchronization, and what are the electrical requirements?
Yes, the LM5001MAX supports external synchronization via the RT pin. The sync pulse must exceed 2.6 V peak (min), have width >15 ns, and be coupled through a 100 pF capacitor. The external clock frequency must be higher than the free-running oscillator frequency set by the RT resistor. The RT resistor remains mandatory in synchronized mode to set DC bias and ensure proper oscillator biasing.
LM5001MAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM5001MAX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5001MAX 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 reliable?
The price and inventory of LM5001MAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5001MAX is usually 5 days.
3.What payment methods are accepted for LM5001MAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5001MAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5001MAX?
LM5001MAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5001MAX 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?
For technical support, including LM5001MAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5001MAX requirements.
6.How does Aetrix verify that LM5001MAX is sourced from the original manufacturer or authorized distributors?
All LM5001MAX 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 meets industry standards.
7.What is the process for return or replacement of LM5001MAX?
All LM5001MAX units undergo pre-shipment inspection (PSI). If there is an issue with LM5001MAX, 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 part is unused and in its original packaging.
Return procedure for LM5001MAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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