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Texas Instruments LM5002MA/NOPB
- Part No.:
- LM5002MA/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5002MA/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
LM5002MA/NOPB from Texas Instruments is a high-voltage current-mode PWM controller IC integrating a 75-V, 0.5-A peak-current N-channel MOSFET for boost, flyback, SEPIC, and forward converters. 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, UVLO, and oscillator synchronization. Used in industrial DC-DC power supplies requiring wide VIN range and compact footprint.
For engineers reviewing the LM5002MA/NOPB datasheet, LM5002MA/NOPB pinout, LM5002MA/NOPB application, or LM5002MA/NOPB equivalent, key selection criteria include verified 75-V MOSFET RDS(on) (850–1600 mΩ), cycle-by-cycle 0.5-A current limit, COMP pin open-circuit voltage (4.8–6.2 V), FB reference tolerance (1.241–1.279 V), and dual-package availability (SOIC-8/WSON-8) with distinct thermal resistance profiles.
Technical Context
The LM5002MA/NOPB implements peak current-mode control with integrated 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 compensation networks for isolated and non-isolated topologies.
Functional protection includes cycle-by-cycle current limiting (0.4–0.6 A), thermal shutdown at 165°C with 20°C hysteresis, EN pin dual-threshold logic (0.45 V shutdown / 1.26 V enable), and internal VCC LDO regulated to 6.9 V (±0.3 V) with 20 mA current limit - all operating across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 75 V - supports direct connection to unregulated industrial bus rails, automotive batteries, and telecom line inputs without pre-regulation. |
| Integrated MOSFET | 75-V N-channel, 0.5-A peak current limit, 850–1600 mΩ RDS(on) - eliminates external high-voltage switch and reduces BOM count in single-stage converters. |
| Feedback Reference | 1.26 V ±1.5% - enables precise output regulation with minimal drift over temperature (±10 mV from –40°C to 125°C). |
| Switching Frequency | 50 kHz to 1.5 MHz - set by single RT resistor; allows optimization of magnetics size vs. efficiency and EMI performance. |
| Current Limit Threshold | 0.5 A typical cycle-by-cycle limit - provides inherent short-circuit protection and soft-start capability without external sensing components. |
| Thermal Shutdown | 165°C with 20°C hysteresis - ensures safe operation under overload or poor heatsinking; resumes regulation only after die cools below 145°C. |
| EN Pin Logic | 0.45 V shutdown / 1.26 V enable thresholds with 0.1 V hysteresis - enables robust undervoltage lockout using simple resistor divider from VIN. |
Pinout & Package
LM5002MA/NOPB is available in 8-pin SOIC (D package, 4.90 mm × 3.90 mm) and 8-pin WSON (NGT package, 4.00 mm × 4.00 mm with exposed pad). The SOIC variant uses standard leaded packaging; WSON offers lower thermal resistance (RθJA = 37.1°C/W vs. 105.7°C/W) and requires PCB ground connection to the EP pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Drain terminal of internal 75-V MOSFET; connects directly to transformer primary or boost inductor - requires low-inductance layout to minimize ringing. |
| VIN | Main power input | Accepts 3.1–75 V supply; powers internal circuitry and MOSFET gate drive; must be decoupled with low-ESR capacitor near pin. |
| VCC | Bias regulator output/input | Internally regulated to 6.9 V (±0.3 V); can accept external 7–12 V supply to disable internal LDO and improve efficiency at high VIN. |
| GND | Power and signal reference | Common return for MOSFET current sense, error amplifier, and driver logic; must connect to low-impedance PCB ground plane. |
| RT | Oscillator programming | Resistor-to-GND sets frequency (50 kHz–1.5 MHz); also accepts sync pulses >2.6 V via 100-pF AC coupling - requires tight placement near IC. |
| FB | Feedback input | Connects to resistive divider from output; referenced to 1.26-V internal precision bandgap - determines regulated output voltage (VOUT = 1.26 × (1 + R1/R2)). |
| COMP | Error amplifier output | Open-drain output with 5-kΩ internal pullup; interfaces with Type-II compensation network or optocoupler collector in isolated designs. |
| EN | Enable/UVLO input | 6-µA internal pullup enables default operation; external divider sets turn-on threshold (e.g., 16 V input → 1.26 V at EN via R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75-V MOSFET | Reduces component count and board space in high-input-voltage DC-DC stages - no external HV switch or gate driver required. |
| Current-mode control with slope compensation | Enables stable operation up to 85% duty cycle in boost/flyback without external compensation; eliminates need for external ramp generator. |
| Adjustable switching frequency (50 kHz–1.5 MHz) | Allows trade-off between magnetic size, conduction loss, and EMI filtering requirements - programmable with single resistor. |
| Thermal shutdown with hysteresis | Prevents catastrophic failure during sustained overload; automatic recovery avoids manual reset - critical for unattended industrial systems. |
| Oscillator synchronization input | Enables EMI reduction via fixed-frequency coordination with system clock - eliminates beat frequencies in multi-rail power systems. |
Applications
| Industrial Power Supply | Automotive Battery Management |
|---|---|
Use Scenario: 24-V or 48-V industrial bus powering PLC I/O modules with variable load demand and wide ambient temperature range. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology providing isolated 5-V/3.3-V rails with <1.5% output regulation accuracy and 75-V input tolerance. Use Value: Eliminates need for pre-regulator stage; withstands 75-V transients per ISO 7637-2; maintains regulation down to 3.1 V during brownout conditions. | Use Scenario: On-board charger auxiliary supply converting 12-V battery to 5-V for microcontroller and CAN transceiver in EV charging systems. IC Role / Device Role / Timing Role: Boost converter controller delivering 500-mA output from cold-cranked battery (as low as 3.1 V) while rejecting load-dump spikes up to 75 V. Use Value: Single-chip solution meets AEC-Q200 stress requirements; thermal shutdown protects against under-hood overheating; EN pin enables system-level sequencing. |
| Telecom Line Card Power | Isolated Medical Sensor Supply |
Use Scenario: -48-V telecom central office line card requiring +5-V and –5-V isolated outputs for analog front-end circuitry. IC Role / Device Role / Timing Role: Flyback controller with optocoupler feedback on secondary side; COMP pin driven by optocoupler collector for galvanic isolation. Use Value: Internal 1.26-V reference and high-gain error amplifier ensure <±1% output accuracy across line/load/temperature; slope compensation guarantees stability at full load. | Use Scenario: Patient-connected medical sensor requiring reinforced isolation and low leakage current in portable diagnostic equipment. IC Role / Device Role / Timing Role: SEPIC converter controller providing non-inverting isolated output from 3.3-V battery, avoiding ground loop risks in biopotential measurement circuits. Use Value: No transformer saturation risk (SEPIC topology); 0.5-A current limit prevents fault propagation; 125°C max junction rating supports sealed enclosure operation. |
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 |
|---|---|---|---|
| LM5005MH/NOPB | Higher 100-V MOSFET rating; 1.5-A peak current limit; wider 2.5–100 V input range; same SOIC-8/WSON-8 packages. | Supports higher input transients and heavier loads; suitable for 48-V telecom rectifiers and PoE++ injectors where LM5002MA/NOPB reaches current limit. | Select LM5005MH/NOPB when input exceeds 75 V or continuous output current >300 mA is required. |
| UCC28C42DR | External MOSFET driver (no integrated FET); 30-V max VDD; requires external 75-V+ MOSFET; 1-MHz max frequency; SOIC-8 only. | Offers greater flexibility in MOSFET selection and thermal management; lacks integrated bias regulator and UVLO - needs external support circuitry. | Choose UCC28C42DR for custom high-efficiency designs where discrete MOSFET optimization outweighs BOM simplification benefits of LM5002MA/NOPB. |
Compared with LM5005MH/NOPB, LM5002MA/NOPB trades off maximum voltage headroom and current capacity for tighter integration and lower quiescent current; versus UCC28C42DR, it delivers faster time-to-design and reduced layout sensitivity but less flexibility in power stage optimization.
Availability
LM5002MA/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery management systems, and telecom line card applications requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LM5002MA/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 leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in high-reliability power conversion ICs.
The LM5002MA/NOPB belongs to TI's high-voltage DC-DC controller product line, designed specifically for efficient, compact, and robust non-isolated and isolated power supplies operating from ultra-wide input ranges in harsh environments.
FAQ
What is the absolute maximum input voltage rating for LM5002MA/NOPB?
The absolute maximum input voltage (VIN to GND) for LM5002MA/NOPB is 76 V, as specified in Section 6.1 of the datasheet. Operation beyond this rating - even transiently - may cause permanent damage. Designers must implement input filtering and clamping (e.g., TVS diodes) to suppress ringing and line transients, especially when operating near the 75-V recommended maximum.
Can LM5002MA/NOPB operate with an external VCC supply?
Yes, LM5002MA/NOPB 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 - particularly beneficial when VIN significantly exceeds the output voltage. However, the external VCC voltage must never exceed VIN or 14 V to avoid reverse current or overstress.
How does the EN pin function in LM5002MA/NOPB?
The EN pin of LM5002MA/NOPB implements dual-threshold logic: below 0.45 V places the IC in low-current shutdown (IQ ≈ 130 µA); between 0.45 V and 1.26 V enables the VCC LDO only (standby mode); above 1.26 V fully enables PWM operation. An internal 6-µA pullup allows default enable when left floating, and 0.1 V hysteresis prevents noise-induced toggling.
What is the purpose of slope compensation in LM5002MA/NOPB?
Slope compensation in LM5002MA/NOPB adds a 450-mV linear ramp to the current-sense signal before comparison with the COMP voltage. This prevents subharmonic oscillation in peak current-mode control when duty cycle exceeds 50%, ensuring stable regulation in boost, flyback, and SEPIC topologies without requiring external components or complex loop tuning.
Does LM5002MA/NOPB support synchronization to an external clock?
Yes, LM5002MA/NOPB supports oscillator synchronization via the RT pin: an external clock signal coupled through a 100-pF capacitor must exceed 2.6 V peak and have pulse width >15 ns to trigger synchronization. The internal RT node DC bias remains at 1.5 V, and the external resistor (RRT) must still be present to set minimum frequency and provide impedance matching.
LM5002MA/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:
- 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
LM5002MA/NOPB FAQ
1.How can I place an order for LM5002MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5002MA/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 LM5002MA/NOPB reliable?
The price and inventory of LM5002MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5002MA/NOPB is usually 5 days.
3.What payment methods are accepted for LM5002MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5002MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5002MA/NOPB?
LM5002MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5002MA/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 LM5002MA/NOPB?
For technical support, including LM5002MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5002MA/NOPB requirements.
6.How does Aetrix verify that LM5002MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5002MA/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 LM5002MA/NOPB meets industry standards.
7.What is the process for return or replacement of LM5002MA/NOPB?
All LM5002MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5002MA/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 LM5002MA/NOPB part is unused and in its original packaging.
Return procedure for LM5002MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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