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Texas Instruments LM5002MAX/NOPB
- Part No.:
- LM5002MAX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5002MAX/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,525
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Product details
Overview
LM5002MAX/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 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 LM5002MAX/NOPB datasheet, LM5002MAX/NOPB pinout, LM5002MAX/NOPB application, or LM5002MAX/NOPB equivalent, key selection criteria include input voltage range (3.1–75 V), integrated 75-V MOSFET RDS(ON) (850–1600 mΩ), adjustable frequency (50 kHz–1.5 MHz), 1.26-V feedback reference, and SOIC-8/WSON-8 package compatibility with thermal design constraints.
Technical Context
The LM5002MAX/NOPB implements peak current-mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier drives the COMP pin for external Type-II compensation, while the PWM comparator compares a scaled current-sense signal (2.1 V/A) plus 450-mV ramp against COMP voltage.
It features dual-threshold EN/UVLO logic (0.45 V shutdown, 1.26 V enable), an integrated VCC LDO regulator tracking VIN up to 6.9 V (±0.25 V regulation), and cycle-by-cycle current limiting at 0.5 A with 100–200 ns delay. Thermal protection triggers at 165°C with 20°C hysteresis, disabling PWM while retaining VCC regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 75 V - supports direct connection to unregulated industrial, automotive, or telecom rails without pre-regulation. |
| Feedback Reference Voltage | 1.26 V ±1.5% - enables precise output regulation with minimal external resistor tolerance impact on setpoint accuracy. |
| Switching Frequency Range | 50 kHz to 1.5 MHz - set by single RT resistor; higher frequencies reduce magnetics size but increase switching losses. |
| Integrated MOSFET | 75-V N-channel, 0.5-A peak current limit, 850–1600 mΩ RDS(ON) - eliminates external high-voltage switch and sense resistor in most topologies. |
| Current Limit Threshold | 0.5 A typical - provides inherent cycle-by-cycle overcurrent protection and soft-start capability via EN pin control. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects die during overload or poor heatsinking; VCC remains active to support controlled recovery. |
| Oscillator Sync Input | RT pin accepts external clock > FSW with ≥2.6 V threshold and ≥15 ns pulse width - enables EMI reduction via spread-spectrum or multi-phase synchronization. |
Pinout & Package
LM5002MAX/NOPB is supplied in an 8-pin SOIC package (4.90 mm × 3.90 mm) with standard JEDEC MS-012AC footprint and exposed pad not present. Thermal resistance is RθJA = 105.7°C/W (SOIC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Drain of internal 75-V MOSFET; connects directly to inductor/transformer primary; requires low-inductance layout to minimize ringing. |
| VIN | Main power input | Accepts 3.1–75 V; supplies gate drive and internal circuitry; must be bypassed with low-ESR capacitor near pin. |
| VCC | Bias supply | Internal LDO output (6.9 V regulated); can accept external 7–12 V supply to disable internal regulator and improve efficiency at high VIN. |
| GND | Power and signal reference | Common return for MOSFET current sense, error amplifier, and PWM comparator; must connect to low-impedance ground plane. |
| RT | Oscillator programming | Resistor-to-GND sets frequency (50 kHz–1.5 MHz); also accepts sync pulses >2.6 V with 100-pF AC coupling. |
| FB | Feedback input | Connects to resistive divider from output; referenced to 1.26-V internal precision bandgap; bias current ≤10 nA. |
| COMP | Error amplifier output | Open-drain output with 5-kΩ internal pullup; hosts external Type-II compensation network between COMP and FB. |
| EN | Enable/UVLO input | Two-threshold control: <0.45 V = shutdown (95 µA IQ), >1.26 V = full operation; internal 6-µA pullup allows single-resistor UVLO setting. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75-V MOSFET | Eliminates need for external high-voltage switch and discrete current sense resistor in boost/flyback designs. |
| Adjustable 50 kHz–1.5 MHz oscillator | Single RT resistor enables optimization of magnetics size vs. efficiency; supports external sync for EMI control. |
| 1.26-V ±1.5% feedback reference | Enables stable output regulation across –40°C to +125°C with minimal external component drift sensitivity. |
| Dual-threshold EN/UVLO | Allows programmable input undervoltage lockout (e.g., 16 V turn-on) with 100-mV hysteresis to prevent chatter during brownout. |
| Internal slope compensation | 450-mV ramp prevents subharmonic oscillation in current-mode control when duty cycle exceeds 50%, ensuring stable loop behavior. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: 24-V battery-fed DC-DC converter generating 5 V/3.3 V for PLC I/O modules in factory automation cabinets exposed to 48-V rail transients. IC Role / Device Role / Timing Role: Primary-side current-mode controller in flyback topology, regulating isolated output using opto-coupler feedback to COMP pin. Use Value: 75-V input rating withstands load-dump spikes; 1.26-V reference ensures <±2% output variation across temperature; SOIC-8 simplifies manual rework in ruggedized assemblies. | Use Scenario: 12-V automotive battery-powered boost converter supplying 24 V to LED headlamp drivers in vehicles with stop-start systems. IC Role / Device Role / Timing Role: High-efficiency boost controller operating from cold-crank (6.5 V) to load-dump (40 V) conditions, using external VCC supply to maintain regulation at low VIN. Use Value: Ultra-wide 3.1–75 V input range covers full automotive transient profile; 0.5-A current limit enables robust short-circuit protection; thermal shutdown prevents latch-up during sustained overloads. |
| Telecom Remote Radio Unit | Industrial IoT Sensor Hub |
Use Scenario: 48-V PoE-derived power supply generating isolated 12 V for RF power amplifiers in outdoor base station radios with strict EMI limits. IC Role / Device Role / Timing Role: Synchronized flyback controller locked to system clock via RT pin to shift switching noise away from sensitive RF bands. Use Value: Oscillator sync capability enables deterministic EMI placement; 85% max duty cycle prevents transformer saturation; WSON-8 package reduces board area in space-constrained enclosures. | Use Scenario: Battery-backed 24-V industrial sensor node powering microcontroller, LoRa transceiver, and analog front-end with minimal BOM count. IC Role / Device Role / Timing Role: SEPIC converter maintaining regulated output during battery voltage decay from 30 V to 10 V, using EN pin for graceful shutdown below 12 V. Use Value: Adjustable UVLO via EN resistor divider extends usable battery life; integrated MOSFET reduces component count; 105.7°C/W SOIC thermal resistance supports convection-cooled designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage current-mode controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5122MH/NOPB | Wider 4.5–100 V input, 3-A peak current, external MOSFET driver; no integrated switch. | Suited for higher-power (>50 W) boost/flyback where thermal management justifies external FET. | Select when >0.5-A output current or >75-V input is required; requires additional gate driver and sense components. |
| UCC28C42DR | 30-V max input, no integrated MOSFET, fixed 1-MHz oscillator, lower quiescent current (1.2 mA). | Targeted at cost-sensitive, medium-input-voltage (<30 V) applications with simpler compensation needs. | Choose for <30 V systems prioritizing low IQ and BOM cost over wide-VIN capability and integration. |
Compared with LM5002MAX/NOPB, LM5122MH/NOPB offers higher voltage/current headroom at the cost of increased complexity and board area, while UCC28C42DR trades integration and VIN range for lower static power and cost in constrained-input applications.
Availability
LM5002MAX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom remote radio units requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5002MAX/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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM5002 belongs to TI's high-voltage DC-DC controller product line, designed specifically for efficient, compact, and robust non-isolated and isolated power conversion in harsh-input environments.
FAQ
What is the maximum allowable input voltage for LM5002MAX/NOPB?
The absolute maximum input voltage (VIN to GND) for LM5002MAX/NOPB is 76 V, with recommended continuous operation up to 75 V. Exceeding 76 V risks permanent damage. In practice, designers must account for voltage ringing during transients-especially in boost or flyback topologies-and use input filtering per Figure 8-1 in the datasheet to ensure the VIN pin never violates this rating during operation of the LM5002MAX/NOPB.
Can LM5002MAX/NOPB operate with an external VCC supply?
Yes, LM5002MAX/NOPB supports external VCC biasing between 7 V and 12 V. Applying voltage in this range disables the internal VCC LDO regulator, reducing internal power dissipation and improving overall converter efficiency-particularly when VIN significantly exceeds the output requirement. However, the external VCC voltage must never exceed VIN or 14 V, as reverse current through the internal VCC-to-VIN diode could damage the LM5002MAX/NOPB.
How is the switching frequency set on LM5002MAX/NOPB?
The switching frequency of LM5002MAX/NOPB is programmed using a single resistor (RT) connected between the RT pin and GND. The relationship is defined by RT = (13.1 × 10⁹ / FSW) − 83 ns. For example, a 48.7-kΩ resistor yields ~260 kHz. The RT pin also accepts external synchronization pulses >2.6 V with ≥15 ns width, enabling EMI control-though the RT resistor remains mandatory even during sync mode.
What protection features does LM5002MAX/NOPB include?
LM5002MAX/NOPB integrates cycle-by-cycle current limiting (0.5 A typical), thermal shutdown (165°C with 20°C hysteresis), undervoltage lockout (dual-threshold EN pin), and internal MOSFET overvoltage clamping. It also includes leading-edge blanking to suppress gate-drive-induced current-sense spikes and built-in slope compensation to prevent subharmonic oscillation. These protections operate autonomously without external components, enhancing reliability of the LM5002MAX/NOPB in demanding applications.
Is LM5002MAX/NOPB compatible with both SOIC-8 and WSON-8 footprints?
LM5002MAX/NOPB is specified and packaged exclusively in the 8-pin SOIC (D package) variant. While the LM5002 family includes a WSON-8 option (LM5002MM/NOPB), the LM5002MAX/NOPB part number corresponds only to the SOIC-8 version (4.90 mm × 3.90 mm). Pin functions are identical between packages, but thermal performance differs significantly: SOIC-8 has RθJA = 105.7°C/W versus WSON-8's 37.1°C/W. PCB layout and thermal design must match the SOIC-8 footprint for LM5002MAX/NOPB.
LM5002MAX/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:
- 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
LM5002MAX/NOPB FAQ
1.How can I place an order for LM5002MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5002MAX/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 LM5002MAX/NOPB reliable?
The price and inventory of LM5002MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5002MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5002MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5002MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5002MAX/NOPB?
LM5002MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5002MAX/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 LM5002MAX/NOPB?
For technical support, including LM5002MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5002MAX/NOPB requirements.
6.How does Aetrix verify that LM5002MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5002MAX/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 LM5002MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5002MAX/NOPB?
All LM5002MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5002MAX/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 LM5002MAX/NOPB part is unused and in its original packaging.
Return procedure for LM5002MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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