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Texas Instruments LM5002SD/NOPB
- Part No.:
- LM5002SD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5002SD/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,123
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Product details
Overview
LM5002SD/NOPB from Texas Instruments is a high-voltage current-mode PWM controller with integrated 75-V/0.5-A N-channel MOSFET, designed for boost, flyback, SEPIC, and forward DC-DC 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, and includes thermal shutdown, UVLO, and cycle-by-cycle current limiting - used in industrial power supplies requiring wide-input regulation.
For engineers reviewing the LM5002SD/NOPB datasheet, LM5002SD/NOPB pinout, LM5002SD/NOPB application, or LM5002SD/NOPB equivalent, key selection criteria include input voltage range (3.1–75 V), integrated MOSFET RDS(on) (850–1600 mΩ), COMP-based loop compensation, RT-programmable oscillator, and dual-threshold EN/UVLO functionality.
Technical Context
The LM5002SD/NOPB implements peak current-mode control with internal 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.
It integrates a high-voltage bias regulator that tracks VIN up to 6.9 V then regulates at 6.9 V (±0.25 V), with 20 mA current limit and 2.8 V UVLO threshold. The SW pin connects directly to the drain of the internal 75-V MOSFET, while the RT pin accepts both resistor-programmed oscillator (50 kHz–1.5 MHz) and external sync pulses (>2.6 V, >15 ns width).
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 72 V industrial/automotive rails without pre-regulation. |
| Output Reference Voltage | 1.26 V ±1.5% - sets precise feedback threshold for adjustable output via resistor divider; enables <±1% output regulation with proper compensation. |
| Switching Frequency Range | 50 kHz to 1.5 MHz - selectable via single RT resistor; higher frequencies reduce magnetics size but increase switching losses. |
| Peak Current Limit | 0.5 A typical - protects internal MOSFET and external components during overload or short-circuit; enables soft-start via controlled current ramp. |
| MOSFET RDS(on) | 850–1600 mΩ - defines conduction loss at full load; impacts efficiency in high-current, low-duty-cycle applications. |
| Thermal Shutdown Threshold | 165°C with 20°C hysteresis - disables PWM while preserving VCC regulator; ensures safe recovery after overheating without manual reset. |
| EN Pin Thresholds | 0.45 V (shutdown), 1.26 V (enable) - dual-level UVLO allows programmable input turn-on/turn-off with hysteresis to reject noise. |
Pinout & Package
LM5002SD/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.90 mm) with exposed pad not present - distinct from WSON variant. Thermal resistance is RθJA = 105.7°C/W (SOIC), requiring moderate copper area for thermal management in continuous 125°C ambient designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Power switch node | Drain terminal of internal 75-V MOSFET; connects to inductor/transformer primary; requires low-inductance layout to minimize ringing. |
| VIN (Pin 2) | Main power input | Accepts 3.1–75 V supply; feeds internal VCC regulator and MOSFET source; must be bypassed with low-ESR capacitor near pin. |
| VCC (Pin 3) | Bias supply rail | Output of internal LDO (6.9 V regulated); powers gate driver and logic; can accept external 7–12 V supply to improve efficiency at high VIN. |
| GND (Pin 4) | Power and signal reference | Common return for MOSFET current sense, error amplifier, and PWM comparator; must connect to low-impedance ground plane. |
| RT (Pin 5) | Oscillator control | Resistor-to-GND sets switching frequency; also accepts AC-coupled sync pulses (≥2.6 V, >15 ns) for multi-converter synchronization. |
| FB (Pin 6) | Feedback input | Connects to resistor divider from output; compares against 1.26-V internal reference; 10 nA bias current minimizes divider error. |
| COMP (Pin 7) | Error amplifier output | Open-drain output driving Type-II compensation network between COMP and FB; internal 5-kΩ pullup enables opto-coupler bias in isolated designs. |
| EN (Pin 8) | Enable/UVLO input | 6-µA internal pullup enables default operation; external resistor divider programs input turn-on voltage; dual thresholds support robust start-up sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75-V/0.5-A N-channel MOSFET | Eliminates external high-voltage switch and associated gate drive complexity; reduces BOM count and layout area in boost/flyback topologies. |
| Current-mode control with slope compensation | Enables stable operation at >50% duty cycle without external compensation; inherent line feed-forward improves transient response to input voltage changes. |
| Adjustable switching frequency (50 kHz–1.5 MHz) | Single RT resistor programming simplifies design iteration; supports EMI optimization and magnetics selection across wide power ranges. |
| 1.26-V ±1.5% internal reference | Provides high-accuracy feedback baseline; enables <1% output tolerance with precision resistors and proper PCB layout. |
| Thermal shutdown with hysteresis | Prevents latch-up during overtemperature events; automatic recovery at ~145°C avoids system reboot requirement in embedded applications. |
Applications
| Industrial DC-DC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V battery-fed boost converter generating 48 V for camera systems or radar modules in factory automation equipment. IC Role / Device Role / Timing Role: Primary PWM controller managing MOSFET switching, current sensing, and feedback regulation in non-isolated boost topology. Use Value: Wide 3.1–75 V input accommodates brownouts and load-dump transients; integrated MOSFET eliminates discrete high-side switch and driver IC. | Use Scenario: Flyback converter powering microcontrollers and sensors from 12 V vehicle battery with cold-crank capability down to 3.1 V. IC Role / Device Role / Timing Role: Isolated flyback controller using opto-coupler feedback, where COMP pin drives opto-transistor and FB is grounded. Use Value: Dual EN thresholds enable reliable start-up during cranking; thermal shutdown protects against under-hood temperature excursions. |
| Telecom 48 V Backup System | SEPIC for Wide-Range Input Sensors |
Use Scenario: SEPIC converter accepting 36–72 V telecom rectified input to deliver regulated 5 V/3.3 V to base station control logic. IC Role / Device Role / Timing Role: High-efficiency SEPIC controller with RT-synchronized switching to reduce conducted EMI in dense rack-mounted systems. Use Value: 1.5 MHz max frequency enables compact magnetics; integrated current limit prevents damage during hot-swap insertion events. | Use Scenario: Sensor interface power supply accepting variable input from solar panel (8–40 V) or USB PD (5–20 V) to generate stable 3.3 V. IC Role / Device Role / Timing Role: Adjustable-output SEPIC controller using FB divider and COMP compensation to maintain regulation across wide VIN range. Use Value: Ultra-wide input range eliminates need for input pre-regulator; 1.5% reference accuracy ensures sensor ADC reference stability. |
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 | Higher 100-V MOSFET rating, 3-A peak current limit, external MOSFET drive; no integrated switch. | Supports higher-power boost/flyback (>100 W); requires external gate driver and high-side FET. | Select when >0.5 A output current or >75 V input is required; not drop-in due to different pinout and external FET dependency. |
| UCC28C42DR | 75-V start-up, no integrated MOSFET, 1-A current sense, fixed 1 MHz oscillator, no RT sync. | Suitable for lower-cost, lower-complexity flyback designs; lacks slope compensation and adjustable frequency. | Choose for cost-sensitive, fixed-frequency applications where external MOSFET is acceptable and sub-50% duty cycle suffices. |
Compared with LM5002SD/NOPB, LM5122MH/NOPB offers higher voltage/current headroom at the cost of increased component count and layout complexity, while UCC28C42DR provides basic functionality with reduced feature set and no frequency adjustability - making LM5002SD/NOPB optimal for mid-power, wide-input, integrated-switch designs requiring flexibility and reliability.
Availability
LM5002SD/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom backup systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5002SD/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 ICs.
The LM5002 belongs to TI's high-voltage DC-DC controller product line, engineered for efficient, compact, and robust non-isolated and isolated power conversion in harsh environments - targeting applications where wide input range and integrated protection are critical.
FAQ
What is the maximum recommended switching frequency for LM5002SD/NOPB?
The LM5002SD/NOPB supports up to 1.5 MHz switching frequency, programmable via the RT resistor. At this frequency, minimum on-time (25 ns) and propagation delays remain within specification, but efficiency decreases due to higher switching losses. For optimal thermal performance in SOIC package, TI recommends ≤1 MHz in continuous 125°C ambient conditions. Always verify MOSFET SOA and transformer core loss at target frequency in final LM5002SD/NOPB design.
Can LM5002SD/NOPB operate with input voltage below 3.1 V?
No - the absolute minimum operating input voltage for LM5002SD/NOPB is 3.1 V, as specified in Recommended Operating Conditions. Below this, the internal VCC regulator cannot sustain bias for control circuitry, and startup fails. During cold-crank events where battery dips to 3.0 V or lower, the device enters undervoltage lockout. The EN pin does not override this fundamental limitation; it only controls enable/disable sequencing above the 3.1 V operational floor. LM5002SD/NOPB must be used within its validated 3.1–75 V range.
How does the COMP pin function in isolated flyback designs using LM5002SD/NOPB?
In isolated flyback configurations, the FB pin is grounded and the COMP pin becomes the opto-coupler collector node. The internal 5-kΩ pullup resistor biases the opto-transistor, allowing secondary-side error amplifier output to modulate COMP voltage and regulate primary-side duty cycle. This configuration decouples primary and secondary grounds while maintaining tight output regulation. The LM5002SD/NOPB datasheet confirms this use case in Figure 8-6 and Section 7.3.5 - no external components are needed beyond the opto-coupler and COMP-to-FB compensation network.
What is the purpose of the exposed pad in LM5002SD/NOPB?
The LM5002SD/NOPB uses an 8-pin SOIC package without an exposed pad - the EP designation applies only to the WSON (NGT) variant. Confusion arises because TI's datasheet lists both packages under "LM5002", but LM5002SD/NOPB specifically denotes the SOIC (D) package. Therefore, thermal management relies solely on standard SOIC pad connections and PCB copper area; no solder paste or vias are required for an exposed pad. Always verify package code: SD = SOIC, MH = HTSSOP, NT = WSON.
Does LM5002SD/NOPB support synchronization with external clock sources?
Yes - the RT pin of LM5002SD/NOPB accepts externally synchronized clock pulses. A 100-pF AC-coupling capacitor injects the sync signal, which must exceed 2.6 V peak and have >15 ns pulse width. The internal RT node is DC-biased at 1.5 V, so the AC component must provide ≥1.1 V swing. Synchronization is only possible at frequencies higher than the free-running oscillator set by the RT resistor. This feature enables EMI reduction in multi-rail systems and is fully supported in LM5002SD/NOPB's SOIC package per Section 7.3.3 of the datasheet.
LM5002SD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- 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:
- 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-WSON (4x4)
LM5002SD/NOPB FAQ
1.How can I place an order for LM5002SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5002SD/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 LM5002SD/NOPB reliable?
The price and inventory of LM5002SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5002SD/NOPB is usually 5 days.
3.What payment methods are accepted for LM5002SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5002SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5002SD/NOPB?
LM5002SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5002SD/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 LM5002SD/NOPB?
For technical support, including LM5002SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5002SD/NOPB requirements.
6.How does Aetrix verify that LM5002SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5002SD/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 LM5002SD/NOPB meets industry standards.
7.What is the process for return or replacement of LM5002SD/NOPB?
All LM5002SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5002SD/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 LM5002SD/NOPB part is unused and in its original packaging.
Return procedure for LM5002SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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