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Texas Instruments LM5001MA/NOPB
- Part No.:
- LM5001MA/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5001MA/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,031
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Product details
Overview
LM5001MA/NOPB from Texas Instruments is a high-voltage current-mode PWM controller with integrated 75-V, 1-A peak current limit N-channel MOSFET, designed for boost, flyback, SEPIC, and forward converter topologies. It operates from 3.1 V to 75 V input, delivers 1.26 V ±1.5% reference accuracy, supports up to 1.5 MHz switching frequency via RT resistor, and includes thermal shutdown at 165°C. Used in industrial DC-DC power supplies requiring wide VIN range and compact high-voltage regulation.
For engineers reviewing the LM5001MA/NOPB datasheet, LM5001MA/NOPB pinout, LM5001MA/NOPB application, or LM5001MA/NOPB equivalent, key selection criteria include its 75-V internal MOSFET RDS(ON) (490–800 mΩ), adjustable 50 kHz–1.5 MHz oscillator, 85% max duty cycle, integrated slope compensation, and dual-threshold EN/UVLO with 0.45 V shutdown and 1.26 V enable thresholds.
Technical Context
The LM5001MA/NOPB implements peak current-mode control using an internal 50 mΩ sense resistor amplified 30× to generate a 1.5 V/A current limit signal, with slope compensation (450 mV ramp) preventing sub-harmonic oscillation above 50% duty cycle. Its oscillator uses a single RT-to-GND resistor and supports external synchronization via AC-coupled pulses exceeding 2.6 V at the RT pin.
Control architecture integrates a high-gain error amplifier (72 dB DC gain, 3 MHz unity-gain bandwidth) with COMP pin access for Type II compensation, while the FB pin references a trimmed 1.26 V internal bandgap. Protection includes cycle-by-cycle current limiting (0.8–1.2 A), thermal shutdown (165°C, 20°C hysteresis), and VCC UVLO (2.6–3.0 V).
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, or battery-backed systems without pre-regulation. |
| Integrated MOSFET | 75-V N-channel, 490–800 mΩ RDS(ON) - eliminates external high-voltage switch, reduces BOM count and layout area. |
| Switching Frequency | 50 kHz to 1.5 MHz - set by single RT resistor; enables optimization of magnetics size vs. efficiency trade-off. |
| Reference Voltage | 1.260 V ±1.5% - enables precise output voltage setting via external resistor divider on FB pin. |
| Current Limit | 0.8 A to 1.2 A (typ. 1.0 A) - cycle-by-cycle protection prevents MOSFET overcurrent during startup or overload. |
| Max Duty Cycle | 80% to 90% - configurable via external components; limits minimum off-time for stable operation in boost/flyback. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects die during sustained overload or poor heatsinking; resumes operation after cooldown. |
Pinout & Package
LM5001MA/NOPB is packaged in SOIC-8 (4.9 mm × 3.91 mm) with exposed pad (EP) not connected internally; EP must be tied to PCB ground for thermal performance. Pin functions are validated per TI SNVS484H datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Power MOSFET drain node | High-voltage switching node; connects to transformer primary or boost inductor; requires minimized loop area for EMI control. |
| VIN | Main input supply | Accepts 3.1–75 V; powers internal VCC LDO and MOSFET gate drive; needs local 0.47 µF ceramic bypass. |
| 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 and improve efficiency. |
| GND | Power and signal reference | Common return for MOSFET current sense, error amplifier, and oscillator; must be low-impedance plane. |
| RT | Oscillator timing/sync input | Resistor sets frequency (50 kHz–1.5 MHz); accepts sync pulses >2.6 V via 100 pF AC coupling; internal 1.5 V DC bias. |
| FB | Feedback reference input | Connects to resistor divider from output; compares against 1.26 V internal reference to regulate output voltage. |
| COMP | Error amplifier output | Open-drain node for external Type II compensation network; internal 5 kΩ pull-up enables opto-coupler bias 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 pull-up enables default-on behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75-V MOSFET | Reduces component count and board space in high-input-voltage converters; eliminates need for external HV gate driver. |
| Ultra-wide 3.1 V–75 V input range | Enables single design across 12 V, 24 V, 48 V, and battery-backed industrial/automotive rails without input stage changes. |
| Adjustable 50 kHz–1.5 MHz oscillator | Allows magnetic component optimization: higher frequencies shrink inductors/transformers; lower frequencies improve light-load efficiency. |
| Slope-compensated current-mode control | Ensures stable operation at duty cycles >50% in boost/flyback without external compensation components. |
| Dual-threshold EN/UVLO | Supports three operational states: shutdown (<0.45 V), standby (0.45–1.26 V), and active (>1.26 V), enabling flexible system-level power sequencing. |
| Thermal shutdown with hysteresis | Prevents permanent damage during overload or ambient temperature excursions; automatic recovery avoids manual reset requirement. |
Applications
| Industrial 48 V DC Power Supply | Automotive LED Driver |
|---|---|
Use Scenario: Regulating 48 V bus down to 12 V or 5 V for PLC I/O modules, sensors, and controllers in factory automation. IC Role / Device Role / Timing Role: Primary PWM controller in non-isolated boost or SEPIC topology; manages MOSFET switching, current sensing, and output regulation. Use Value: Eliminates need for external HV MOSFET and gate driver; 75 V rating handles 48 V transients per IEC 61000-4-5; 1.26 V reference ensures ±1.5% output accuracy over temperature. | Use Scenario: Driving high-brightness LEDs from 12 V–24 V vehicle batteries with constant-current output and dimming capability. IC Role / Device Role / Timing Role: Flyback controller regulating LED string current via secondary-side feedback; EN pin used for PWM dimming interface. Use Value: Integrated current sense and slope compensation simplify flyback design; 85% max duty cycle prevents transformer saturation; thermal shutdown protects against under-hood overheating. |
| Telecom Boost Converter | Isolated Medical Power Module |
Use Scenario: Stepping up -48 V telecom supply to +5 V or +3.3 V for digital logic in base station equipment. IC Role / Device Role / Timing Role: Boost controller operating in inverted topology; COMP pin drives opto-coupler for isolated feedback path. Use Value: VCC pin accepts auxiliary winding voltage to disable internal LDO, improving efficiency above 12 V; 1.5 MHz max frequency allows ultra-small magnetics. | Use Scenario: Providing reinforced isolation for patient-connected devices requiring 5 kVRMS creepage/clearance and low leakage current. IC Role / Device Role / Timing Role: Primary-side flyback controller with FB grounded and COMP driven by opto-coupler; EN pin used for remote enable/disable. Use Value: Internal 1.26 V reference and high-accuracy error amplifier (72 dB gain) ensure tight output regulation; thermal shutdown meets IEC 60601-1 fault safety requirements. |
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 |
|---|---|---|---|
| LM5002MA/NOPB | Higher 100-V MOSFET rating; 1.5-A peak current limit; same pinout and feature set. | Required for inputs >75 V (e.g., 96 V battery systems); supports higher output power due to increased current limit. | Select when input voltage exceeds 75 V or peak load current exceeds 1.2 A. |
| UCC28C42DR | External MOSFET required; 30-V VDD max; no integrated HV switch; lower quiescent current (1.2 mA). | Used where discrete FET selection is needed for specialized RDS(ON), voltage, or thermal requirements; lacks integrated bias regulator. | Choose for cost-sensitive designs with lower VIN (<30 V) and where layout flexibility justifies external FET. |
Compared with LM5002MA/NOPB, the LM5001MA/NOPB offers lower voltage rating but identical control features and footprint-ideal for ≤75 V systems. Versus UCC28C42DR, it trades external FET flexibility for integration, reducing component count and simplifying layout at the cost of fixed 75-V MOSFET limits.
Availability
LM5001MA/NOPB is available at Aetrix Electronics and suitable for industrial 48 V DC power supplies, automotive LED drivers, and telecom boost converters requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant variants (LM5001-Q1).
Supply support for LM5001MA/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 delivering analog and embedded processing solutions, with leadership in power management ICs and high-reliability automotive/industrial products.
The LM5001 belongs to TI's high-voltage DC-DC controller product line, engineered for efficient, compact, and robust non-isolated and isolated switching power supplies operating from 3.1 V to 75 V input rails.
FAQ
What is the absolute maximum input voltage rating for the LM5001MA/NOPB?
The LM5001MA/NOPB has an absolute maximum VIN-to-GND rating of 76 V, as specified in Section 6.1 of the SNVS484H datasheet. Operation above this voltage risks permanent damage. For reliable 75 V continuous operation, ensure input transients (e.g., IEC 61000-4-5 surges) do not exceed 76 V - use input clamping or filtering if necessary. The LM5001MA/NOPB is rated for 75 V nominal input, making it suitable for 48 V and 60 V industrial systems with margin.
Can the LM5001MA/NOPB be synchronized to an external clock, and what are the requirements?
Yes, the LM5001MA/NOPB supports external oscillator synchronization via the RT pin. The external clock must exceed the free-running frequency set by the RT resistor, have a rising edge pulse >2.6 V peak at RT, pulse width >15 ns, and be AC-coupled through a 100 pF capacitor. The internal RT bias remains at 1.5 V DC, so the AC pulse must provide ≥1.1 V amplitude. The RT resistor must remain installed whether synchronizing or not. This feature enables noise reduction in multi-rail systems using LM5001MA/NOPB.
How does the EN pin function in the LM5001MA/NOPB, and what are its threshold voltages?
The LM5001MA/NOPB EN pin provides three operational states: shutdown (<0.45 V), standby (0.45–1.26 V), and active (>1.26 V). At shutdown, VCC LDO and PWM are disabled (IQ = 95 µA). In standby, only VCC LDO operates; PWM remains blocked. Full operation begins above 1.26 V, with 100 mV hysteresis preventing noise-induced toggling. An internal 6 µA pull-up enables default-on behavior when EN is open. These thresholds allow precise UVLO programming using external resistive dividers from VIN.
What is the purpose and implementation of slope compensation in the LM5001MA/NOPB?
Slope compensation in the LM5001MA/NOPB adds a 450 mV linear ramp to the current-sense signal before comparison with the COMP voltage, preventing sub-harmonic oscillation in current-mode control when duty cycle exceeds 50%. It is fully integrated - no external components required. The ramp starts at 0 V when the MOSFET turns on and reaches 450 mV at the end of the switching period. This ensures stable operation in boost, flyback, and SEPIC topologies without requiring additional circuitry, directly enhancing design robustness for the LM5001MA/NOPB.
Does the LM5001MA/NOPB support isolated feedback configurations, and how is COMP used in that case?
Yes, the LM5001MA/NOPB supports isolated feedback by grounding the FB pin and driving the COMP pin directly with an opto-coupler collector. In this configuration, the internal error amplifier is disabled, and regulation is performed by an external error amplifier on the secondary side. The COMP pin's internal 5 kΩ pull-up resistor biases the opto-coupler transistor, enabling galvanic isolation. This method is commonly used in flyback and forward converters requiring reinforced isolation, and is explicitly documented in the LM5001MA/NOPB datasheet Figure 19 and Section 7.3.5.
LM5001MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LM5001MA/NOPB FAQ
1.How can I place an order for LM5001MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5001MA/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 LM5001MA/NOPB reliable?
The price and inventory of LM5001MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5001MA/NOPB is usually 5 days.
3.What payment methods are accepted for LM5001MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5001MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5001MA/NOPB?
LM5001MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5001MA/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 LM5001MA/NOPB?
For technical support, including LM5001MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5001MA/NOPB requirements.
6.How does Aetrix verify that LM5001MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5001MA/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 LM5001MA/NOPB meets industry standards.
7.What is the process for return or replacement of LM5001MA/NOPB?
All LM5001MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5001MA/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 LM5001MA/NOPB part is unused and in its original packaging.
Return procedure for LM5001MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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