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Texas Instruments LM2587S-ADJ/NOPB
- Part No.:
- LM2587S-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2587S-ADJ/NOPB.pdf
- Description:
- IC REG BST FLYBACK ADJ 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:343
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Product details
Overview
LM2587S-ADJ/NOPB from Texas Instruments is a monolithic 5-A, 100-kHz step-up (boost) and flyback switching regulator IC with adjustable output voltage, wide 4 V to 40 V input range, internal 5-A NPN switch rated for 65 V standoff, and ±4% system output voltage tolerance over line and load. It serves as the core control and power switch in isolated or non-isolated DC-DC converters for industrial power supplies and battery-powered systems.
For engineers reviewing the LM2587S-ADJ/NOPB datasheet, LM2587S-ADJ/NOPB pinout, LM2587S-ADJ/NOPB application, or LM2587S-ADJ/NOPB equivalent, key selection criteria include its adjustable feedback reference (1.230 V), current-mode control architecture, integrated soft-start, undervoltage lockout (3.30 V threshold), and thermal shutdown protection - all critical for stable high-current boost/flyback designs operating across wide input ranges.
Technical Context
The LM2587S-ADJ/NOPB implements current-mode PWM control using an internal 100-kHz oscillator, error amplifier with 670 V/V gain and 3.2 mmho transconductance, and cycle-by-cycle peak current limiting. Its NPN output switch delivers up to 5 A with 0.7 V saturation voltage at 5 A and sustains 65 V, enabling robust operation in boost topologies where switch voltage exceeds input.
Feedback is referenced to a precision 1.230 V (±2.2% over temperature) bandgap reference; output voltage is set externally via resistor divider on the FB pin. Internal soft-start limits in-rush current by controlling the error amplifier output ramp, while undervoltage lockout disables operation below 3.05 V to prevent erratic startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports wide-range inputs including 5 V, 12 V, 24 V, and 36 V rails without external pre-regulation. |
| Switch Current Limit | 6.5 A typical (5.0–9.5 A min/max) - sets peak inductor current threshold to protect internal NPN transistor during overload. |
| Reference Voltage | 1.230 V ±2.2% - precise feedback reference enabling accurate adjustable output voltage setting (e.g., 5 V to 40 V) via external resistors. |
| Oscillator Frequency | 100 kHz ±15% - fixed-frequency operation simplifies EMI filtering and enables use of standard low-cost magnetics. |
| UVLO Threshold | 3.30 V (3.05–3.75 V) - ensures reliable disable below minimum functional input, preventing brownout-induced instability. |
| Efficiency | Up to 90% - achieved in flyback configurations at 10 V input / 1 A load, reducing thermal load and improving power density. |
| Thermal Shutdown | 150°C junction - protects device under sustained overload or poor heatsinking; auto-recovery after cooldown. |
Pinout & Package
LM2587S-ADJ/NOPB is packaged in a 5-pin DDPAK/TO-263 (KTT) thermally enhanced surface-mount package (10.16 mm × 8.42 mm body), optimized for high-power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Input | Power input supply connection | Accepts 4–40 V DC; requires local 100 µF+ bulk capacitance for stability and transient response. |
| Pin 2: Ground | Power and signal reference node | Must be low-impedance, star-connected to minimize noise coupling into feedback and compensation paths. |
| Pin 3: Feedback | Output voltage sensing input | Compares divided output voltage to 1.230 V reference; sets regulated output via R1/R2 divider (R2 = VREF × R1/(VOUT − VREF)). |
| Pin 4: Compensation | Error amplifier output and loop compensation node | Connects RC network to stabilize control loop; typical design uses 1 MΩ resistor + 1 nF capacitor for phase margin >45°. |
| Pin 5: Switch | Collector of internal NPN power transistor | Drives primary winding of flyback transformer or boost inductor; must interface with fast recovery diode and snubber network. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables inherent line/load transient rejection, simplifies loop compensation, and provides cycle-by-cycle overcurrent protection. |
| Internal soft-start | 11 µA soft-start current ramps COMP voltage gradually, limiting in-rush current and preventing output overshoot at startup. |
| Integrated 5-A/65-V NPN switch | Eliminates need for external high-voltage power transistor; reduces BOM count and layout complexity in boost/flyback designs. |
| ±4% system output tolerance | Guaranteed over full input (4–40 V) and load (300 mA–1.2 A) ranges - meets tight regulation requirements for sensitive downstream circuitry. |
| Thermal shutdown + UVLO + current limit | Triple fault protection ensures safe operation under short-circuit, overtemperature, and undervoltage conditions without external supervision. |
Applications
| Industrial Power Supply | Battery-Powered Equipment |
|---|---|
|
Use Scenario: 24 V nominal input (18–36 V range) stepped up to 48 V for PoE++ midspan or motor driver bias rail. IC Role / Device Role / Timing Role: Primary controller and power switch in non-isolated boost converter; regulates output using current-mode PWM at 100 kHz. Use Value: Delivers 1.2 A at 48 V with 90% efficiency and ±4% regulation, eliminating need for external MOSFET and gate driver. |
Use Scenario: Single-cell Li-ion (3.0–4.2 V) or 3-cell NiMH (3.6–4.5 V) powering 12 V analog sensors and microcontrollers. IC Role / Device Role / Timing Role: Adjustable boost regulator IC with 1.23 V reference; sets output via resistor divider; operates down to 4 V input. Use Value: Maintains stable 12 V output across battery discharge curve with no external voltage reference or compensation components required. |
| Flyback-Based AC/DC Adapter | Automotive Auxiliary Power |
|
Use Scenario: 12 V automotive input (9–16 V) generating isolated ±12 V outputs for op-amp biasing in test instrumentation. IC Role / Device Role / Timing Role: Flyback controller with internal NPN switch driving transformer primary; regulates multiple outputs via secondary winding ratios. Use Value: Achieves ±12 V at 300 mA per rail with <100 mV ripple using standard off-the-shelf flyback transformers (e.g., Coilcraft Q4438-B). |
Use Scenario: 24 V truck battery (18–32 V) supplying 5 V USB-C PD port and 3.3 V MCU rail in telematics module. IC Role / Device Role / Timing Role: Dual-output flyback regulator IC; primary-side sensing enables isolated regulation without optocoupler. Use Value: Meets automotive transient requirements (ISO 7637-2) with built-in UVLO (3.05 V) and thermal shutdown, reducing system-level protection components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up and flyback regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587T-ADJ/NOPB | TO-220-5 package (14.986 mm × 10.16 mm); higher θJA (65°C/W vs. 56°C/W); identical electrical specs. | Better suited for prototyping or low-volume through-hole assembly; requires larger PCB area and external heatsink above ~3 W dissipation. | Select LM2587T-ADJ/NOPB when manual soldering, socket-based testing, or legacy TO-220 footprint compatibility is required. |
| LM2577-ADJ | Lower 3-A switch current rating; 50 kHz switching frequency; no internal soft-start; different pinout and compensation behavior. | Limited to ≤3 A output in boost mode; less efficient at high input-to-output ratios; requires external soft-start circuit for clean startup. | Choose LM2577-ADJ only for cost-sensitive, lower-current (<2 A), non-critical applications where 100 kHz EMI or thermal performance is not prioritized. |
Compared with LM2587T-ADJ/NOPB, the LM2587S-ADJ/NOPB offers superior thermal performance in surface-mount designs, while LM2577-ADJ trades current capability and integration for lower cost - making LM2587S-ADJ/NOPB optimal for production-grade 5-A boost/flyback converters demanding reliability and compactness.
Availability
LM2587S-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, automotive auxiliary rails, and isolated flyback adapters requiring stable component supply and long-term manufacturability.
Supply support for LM2587S-ADJ/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 delivering analog, embedded processing, and power management solutions with emphasis on reliability, longevity, and design enablement.
The LM2587S-ADJ/NOPB belongs to TI's legacy high-current DC-DC controller family, engineered specifically for cost-effective, low-component-count boost and flyback converters in industrial, automotive, and telecom infrastructure applications.
FAQ
What is the maximum output current achievable with LM2587S-ADJ/NOPB in boost configuration?
The LM2587S-ADJ/NOPB internal 5-A NPN switch limits peak inductor current, but output current depends on input voltage, output voltage, and efficiency. At 12 V input to 24 V output, it reliably delivers 1.2 A continuous with proper heatsinking and layout. Output current must be externally limited to ≤5 A to prevent switch damage, as internal current limiting applies only in flyback mode per datasheet Section 6.9.
Does LM2587S-ADJ/NOPB require an external diode in boost topology?
Yes, LM2587S-ADJ/NOPB requires an external fast-recovery or Schottky diode (e.g., 60 V, 5 A) between the Switch pin and output capacitor in boost configuration. The diode blocks reverse current during switch conduction and transfers inductor energy to the output. TI recommends diodes with <50 ns reverse recovery time and low forward voltage to maximize efficiency.
How is output voltage set on LM2587S-ADJ/NOPB?
LM2587S-ADJ/NOPB uses a 1.230 V internal reference at the Feedback (FB) pin. Output voltage is set by a resistor divider: VOUT = 1.230 V × (1 + R1/R2), where R2 connects FB to ground and R1 connects output to FB. For example, 12 V output requires R1 = 8.73 kΩ and R2 = 1 kΩ. Layout must minimize noise pickup on the FB trace.
Can LM2587S-ADJ/NOPB operate from a 3.3 V input source?
No - LM2587S-ADJ/NOPB has a minimum input voltage of 4 V due to its undervoltage lockout threshold (3.05 V min). Operation below 4 V risks unstable startup or shutdown. For 3.3 V input applications, consider TI's TPS61088 (20-V, 5-A boost) or MAX1722 (inductorless, 3.3-V compatible), which support lower VIN.
What thermal considerations apply to LM2587S-ADJ/NOPB in DDPAK package?
LM2587S-ADJ/NOPB in KTT (DDPAK/TO-263) package has θJA = 56°C/W with minimal copper (0.136 in²) but improves to 26°C/W with 1.0064 in² of 1 oz. copper. To maintain TJ < 125°C, keep power dissipation below 1.3 W with minimal copper or 2.7 W with full thermal pad. Use solder mask defined thermal pad, ≥6 vias to inner ground planes, and avoid routing noisy traces under the IC.
LM2587S-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 60V
- Current - Output:
- 5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2587S-ADJ/NOPB FAQ
1.How can I place an order for LM2587S-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2587S-ADJ/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 LM2587S-ADJ/NOPB reliable?
The price and inventory of LM2587S-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2587S-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2587S-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2587S-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2587S-ADJ/NOPB?
LM2587S-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2587S-ADJ/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 LM2587S-ADJ/NOPB?
For technical support, including LM2587S-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2587S-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2587S-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2587S-ADJ/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 LM2587S-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2587S-ADJ/NOPB?
All LM2587S-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2587S-ADJ/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 LM2587S-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2587S-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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