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Texas Instruments LM2587T-3.3/NOPB
- Part No.:
- LM2587T-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2587T-3.3/NOPB.pdf
- Description:
- IC REG BST FLYBACK 3.3V TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,221
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Product details
Overview
LM2587T-3.3/NOPB from Texas Instruments is a monolithic 5-A step-up (boost) and flyback switching regulator IC with fixed 3.3-V output, 4-V to 40-V input range, 100-kHz fixed-frequency operation, NPN internal switch rated for 65-V standoff and 5-A peak current, and ±4% system output voltage tolerance over line and load. It serves as the primary power conversion controller in isolated or non-isolated DC-DC supplies for industrial sensors and low-voltage embedded systems.
For engineers reviewing the LM2587T-3.3/NOPB datasheet, LM2587T-3.3/NOPB pinout, LM2587T-3.3/NOPB application, or LM2587T-3.3/NOPB equivalent, key selection criteria include input voltage range compatibility, internal NPN switch voltage/current ratings, fixed-output configuration versus adjustable versions, thermal performance under 1.75-A load at 3.3 V, and flyback transformer selection guidance per TI's recommended part table.
Technical Context
The LM2587T-3.3/NOPB implements current-mode control using an internal 100-kHz oscillator and cycle-by-cycle peak current limiting. Its error amplifier compares feedback voltage against a trimmed 3.3-V reference (not 1.23 V), enabling direct regulation without external resistor dividers for fixed-output operation.
It integrates undervoltage lockout (3.3 V threshold), thermal shutdown, and soft-start via internal 11-μA current source into the compensation pin. The NPN switch exhibits 0.7-V typical saturation voltage at 5 A and sustains up to 65 V, supporting both boost and flyback topologies with external diode, inductor/transformer, and output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line/load/temperature range - eliminates need for external feedback resistors in standard boost/flyback designs. |
| Input Voltage Range | 4 V to 40 V - supports wide-range industrial inputs including 5-V, 12-V, and 24-V rails without pre-regulation. |
| Switch Current Limit | 6.5 A typical, 5.0 A minimum - defines maximum peak inductor current; output current must be externally limited to ≤1.75 A in boost mode. |
| Switching Frequency | 100 kHz ±15% - enables use of compact magnetics while balancing EMI and efficiency trade-offs. |
| Output Switch | NPN transistor, 65-V standoff, 0.7-V VCE(sat) at 5 A - requires external flywheel diode and limits topology choice to boost/flyback/forward (not buck). |
| Thermal Shutdown | Activates at 150°C junction temperature - protects device during overload or insufficient heatsinking in TO-220 or DDPAK packages. |
| Soft-Start Current | 11 μA into COMP pin - controls ramp rate of internal error amp output to limit inrush current during startup. |
Pinout & Package
LM2587T-3.3/NOPB is available in TO-220 (NDH) and DDPAK/TO-263 (KTT) packages. Both are 5-pin devices with identical pin functions and thermal pad on KTT variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Input | Power input | Accepts 4–40 V DC; connects to bulk input capacitor and current-sense resistor for UVLO and current limit. |
| Pin 2: Ground | Power and signal reference | Common return for input, output, and internal circuits; must be low-inductance connection to minimize noise. |
| Pin 3: Feedback | Voltage sense input | Internally connected to 3.3-V reference; no external divider required for fixed-output operation. |
| Pin 4: Compensation | Error amplifier output | Connects to RC network for loop stability; soft-start current charges external capacitor here. |
| Pin 5: Switch | NPN collector output | Drives external flyback transformer primary or boost inductor; requires freewheeling diode and snubber. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity in space-constrained designs. |
| Integrated 5-A NPN switch | Reduces external component count vs. controller-only ICs; simplifies design but requires careful thermal management above 1 A. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting, improved line/load transient response, and simplified loop compensation. |
| Internal soft-start | 11-μA current source into COMP pin enables controlled output voltage ramp, preventing input rail collapse during startup. |
| System-level ±4% tolerance | Guarantees regulated 3.3-V output across full operating conditions - critical for powering sensitive logic or analog circuitry. |
Applications
| Industrial Sensor Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Powers 3.3-V microcontrollers and analog front-ends in battery-powered industrial sensors operating from 5–24-V nominal rails. IC Role / Device Role / Timing Role: Primary DC-DC converter in non-isolated boost configuration, delivering regulated 3.3 V at up to 1.75 A with minimal external components. Use Value: Enables single-rail operation across wide input range without LDO dropout loss; ±4% tolerance ensures reliable MCU boot and ADC accuracy. | Use Scenario: Supplies 3.3-V logic for CAN transceivers and door module microcontrollers in 12-V automotive systems with cold-crank down to 4 V. IC Role / Device Role / Timing Role: Input-robust flyback regulator providing isolated 3.3-V output with built-in UVLO and thermal protection. Use Value: Maintains regulation during cranking events; integrated current limit prevents damage during short-circuit faults in harsh environments. |
| Point-of-Load Converter | Legacy Equipment Retrofit |
Use Scenario: Replaces aging linear regulators in legacy industrial PLC I/O modules requiring efficient 3.3-V local power from 12-V backplane. IC Role / Device Role / Timing Role: Step-down replacement via flyback topology using existing transformer footprint; operates at fixed 100-kHz frequency. Use Value: Reduces heat generation by >70% vs. linear solution; leverages TI's listed standard transformers (e.g., Coilcraft Q4337-B) for drop-in mechanical fit. | Use Scenario: Upgrades obsolete 78L33 linear regulators in medical diagnostic equipment where board space and efficiency are constrained. IC Role / Device Role / Timing Role: Compact boost regulator in TO-220 package replacing through-hole linear regulators with same mounting holes. Use Value: Delivers 1.75-A output at 3.3 V with 75% efficiency at 12-V input - extends battery life and reduces thermal stress on adjacent components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587T-5.0/NOPB | Fixed 5-V output; identical pinout, package, and electrical specs except reference voltage and load regulation points. | Requires redesign of output filter and transformer turns ratio for 5-V systems; not interchangeable without circuit changes. | Select only when 5-V output is required; shares same layout and thermal design. |
| LM2587T-ADJ/NOPB | Adjustable output (1.23 V to 40 V); uses external resistor divider on FB pin; same switch, frequency, and protection features. | Supports custom output voltages but adds two resistors and increases feedback loop complexity and sensitivity to noise. | Choose for flexibility across multiple output requirements; avoid if fixed 3.3 V suffices to reduce cost and risk. |
Compared with LM2587T-5.0/NOPB and LM2587T-ADJ/NOPB, the LM2587T-3.3/NOPB offers lowest BOM count and highest integration for dedicated 3.3-V systems, with guaranteed ±4% tolerance eliminating post-production calibration - critical for compliance-driven industrial and medical applications.
Availability
LM2587T-3.3/NOPB is available at Aetrix Electronics and suitable for industrial sensor power supplies, automotive body control modules, point-of-load converters, and legacy equipment retrofits requiring stable component supply and long-term manufacturability.
Supply support for LM2587T-3.3/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, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.
The LM2587 series was designed specifically for cost-sensitive, high-reliability flyback, boost, and forward converter applications requiring minimal external components and robust thermal/overcurrent protection - targeting industrial automation and automotive subsystems.
FAQ
What is the maximum continuous output current supported by the LM2587T-3.3/NOPB in boost configuration?
The LM2587T-3.3/NOPB supports up to 1.75 A continuous output current in boost configuration, as specified in its Electrical Characteristics table for the 3.3-V version. This limit arises from thermal constraints and internal current-limit thresholds; exceeding it risks thermal shutdown or reduced reliability. External component selection - especially inductor DCR, output capacitor ESR, and heatsinking - directly impacts achievable output current. The LM2587T-3.3/NOPB datasheet confirms this rating under VIN = 4–12 V and TJ ≤ 125°C conditions.
Does the LM2587T-3.3/NOPB require external feedback resistors to set the output voltage?
No, the LM2587T-3.3/NOPB does not require external feedback resistors. It integrates a precision 3.3-V reference internally connected to the Feedback (FB) pin, enabling fixed-output operation without external dividers. This is confirmed in Section 6.5 ("Electrical Characteristics: 3.3 V") and Figure 7.2 of the datasheet, which shows R1 and R2 omitted for fixed versions. Using external resistors would disrupt regulation and is unnecessary - the LM2587T-3.3/NOPB is functionally distinct from the adjustable LM2587T-ADJ/NOPB in this regard.
Can the LM2587T-3.3/NOPB be used in flyback topology with multiple outputs?
Yes, the LM2587T-3.3/NOPB can be used in multi-output flyback configurations, as documented in Figures 25–27 of the datasheet. It regulates the primary output (3.3 V) directly via the FB pin, while secondary outputs rely on transformer turns ratios and post-regulation (e.g., Zener clamps or LDOs) for tighter tolerance. TI provides transformer selection tables listing compatible parts (e.g., Coilcraft Q4337-B) for dual- and triple-output designs. Cross-regulation performance depends on transformer coupling quality and load balance across outputs.
What is the purpose of the Compensation (COMP) pin on the LM2587T-3.3/NOPB?
The Compensation (COMP) pin on the LM2587T-3.3/NOPB is the output of the internal error amplifier and serves two critical functions: (1) it interfaces with an external RC network to stabilize the control loop and prevent oscillation, and (2) it receives the internal 11-μA soft-start current to ramp the output voltage gradually during power-up. Section 6.9 specifies COMP pin voltage swing limits (0.25–2.8 V), and Figure 7.2 shows its connection to the compensation network. Proper COMP network design is essential for transient response and stability - the LM2587T-3.3/NOPB cannot operate reliably without it.
How does the undervoltage lockout (UVLO) feature work on the LM2587T-3.3/NOPB?
The LM2587T-3.3/NOPB incorporates an internal undervoltage lockout circuit that disables the switch when input voltage falls below 3.30 V (typical), with a 3.05–3.75 V threshold range over temperature. This prevents erratic operation during brownout or startup, ensuring clean enablement only when sufficient input headroom exists. UVLO hysteresis is not specified, but the device remains latched off until VIN rises above the threshold. This behavior is verified in Section 6.9 (VUV parameter) and aligns with TI's stated design intent for robust industrial power sequencing - a key differentiator from basic linear regulators.
LM2587T-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, Forward Converter
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2587T-3.3/NOPB FAQ
1.How can I place an order for LM2587T-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2587T-3.3/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 LM2587T-3.3/NOPB reliable?
The price and inventory of LM2587T-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2587T-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2587T-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2587T-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2587T-3.3/NOPB?
LM2587T-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2587T-3.3/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 LM2587T-3.3/NOPB?
For technical support, including LM2587T-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2587T-3.3/NOPB requirements.
6.How does Aetrix verify that LM2587T-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2587T-3.3/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 LM2587T-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2587T-3.3/NOPB?
All LM2587T-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2587T-3.3/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 LM2587T-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2587T-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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