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Texas Instruments LM2587SX-ADJ/NOPB
- Part No.:
- LM2587SX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2587SX-ADJ/NOPB.pdf
- Description:
- IC REG BST FLYBACK ADJ 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,100
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Product details
Overview
LM2587SX-ADJ/NOPB from Texas Instruments is a monolithic 5-A step-up (boost) and flyback switching regulator IC with adjustable output voltage, 4 V to 40 V input range, 100 kHz fixed-frequency operation, internal 5-A NPN switch rated for 65 V standoff, and current-mode control architecture. It enables compact, cost-effective DC-DC conversion in industrial power supplies and battery-powered systems requiring regulated high-voltage outputs.
For engineers reviewing the LM2587SX-ADJ/NOPB datasheet, LM2587SX-ADJ/NOPB pinout, LM2587SX-ADJ/NOPB application, or LM2587SX-ADJ/NOPB equivalent, key selection criteria include its adjustable feedback reference (1.23 V), ±4% system output tolerance over line/load, internal soft-start, undervoltage lockout (3.3 V threshold), and thermal shutdown protection - all critical for reliable boost/flyback design validation and BOM optimization.
Technical Context
The LM2587SX-ADJ/NOPB implements current-mode control using an internal error amplifier (transconductance: 3.2 mmho typ), comparator, and 100 kHz oscillator to regulate output by modulating peak switch current. Its NPN output transistor operates in discontinuous or continuous conduction mode depending on inductor selection and load conditions.
Feedback is taken from the output via a resistor divider to the FB pin, referenced to a precision 1.230 V (±2.2% over temp) internal bandgap. The COMP pin provides error amplifier output for external compensation, enabling stable loop response across wide input/output ratios typical of flyback and boost topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Output Current Capability | 5 A switch current limit - defines maximum primary-side energy transfer; output current depends on topology and duty cycle. |
| Switch Voltage Rating | 65 V - enables safe operation in 48-V bus systems and flyback designs with reflected output voltage spikes. |
| Reference Voltage | 1.230 V (±1.8% at 25°C, ±2.2% over −40°C to +125°C) - sets output voltage accuracy baseline for adjustable configurations. |
| Switching Frequency | 100 kHz (±15% over temp) - balances magnetics size, efficiency, and EMI; fixed frequency simplifies filter design. |
| System Output Tolerance | ±4% over full line/load/temperature - ensures predictable regulation without post-regulation stages in many applications. |
| Undervoltage Lockout | 3.30 V (3.05–3.75 V range) - prevents erratic startup during brownout or low-battery conditions. |
Pinout & Package
LM2587SX-ADJ/NOPB is packaged in a 5-pin DDPAK/TO-263 (KTT) surface-mount package with exposed thermal pad (10.16 mm × 8.42 mm body size), optimized for high-power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply | Primary DC input connection; must be decoupled near pin with ≥10 μF low-ESR capacitor to handle high di/dt. |
| GND | Power Ground | Common return for input capacitor, output rectifier cathode, and IC substrate; requires low-inductance plane connection. |
| SW | Switch Collector | Open-collector NPN output node; connects to primary winding of transformer or inductor; handles 5-A pulsed current. |
| FB | Feedback Input | High-impedance input sensing resistor-divider output; regulates VOUT = 1.23 V × (1 + R1/R2); bias current <600 nA. |
| COMP | Error Amplifier Output | Transconductance amplifier output (3.2 mmho); used for Type II/III compensation network to stabilize control loop. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | Configurable from ~1.23 V to >40 V via external resistor divider - eliminates need for multiple fixed-output SKUs. |
| Internal Soft-Start | 11 μA (typ) soft-start current charges external capacitor to limit inrush and prevent output overshoot at startup. |
| Current-Mode Control | Enables inherent cycle-by-cycle current limiting, fast transient response, and simplified loop compensation vs. voltage-mode. |
| Thermal Shutdown Protection | Activates at TJ ≥150°C - prevents permanent damage during overload or poor heatsinking; auto-recovery on cooldown. |
| Integrated 5-A NPN Switch | Eliminates external transistor and driver, reducing component count and layout complexity in boost/flyback designs. |
Applications
| Industrial DC Power Supply | Automotive Battery Backup System |
|---|---|
|
Use Scenario: Generating isolated 12 V or 24 V from 12 V vehicle battery for infotainment or telematics modules during engine cranking (input dips to 4–6 V). IC Role / Device Role / Timing Role: Flyback controller regulating secondary-side output; uses transformer isolation to withstand load-dump transients. Use Value: Maintains ±4% output stability across 4–40 V input range and −40°C to +125°C junction temperature, ensuring uninterrupted operation. |
Use Scenario: Boosting 12 V battery to 24 V for legacy sensors or actuators in modern 12 V architectures. IC Role / Device Role / Timing Role: Step-up (boost) regulator with fixed 100 kHz switching; drives external Schottky diode and power inductor. Use Value: Delivers up to 5 A switch current with internal current limiting and thermal shutdown, preventing fault propagation during short-circuit events. |
| Telecom Remote Power Feeding | Test Equipment Auxiliary Supply |
|
Use Scenario: Providing isolated ±12 V dual outputs from 5 V or 12 V backplane in telecom line cards requiring PoE-like remote powering. IC Role / Device Role / Timing Role: Dual-output flyback controller; uses transformer with center-tapped secondary and synchronous rectification. Use Value: Achieves >90% efficiency at 1 A per rail (per datasheet Figure 62), minimizing heat rise in densely packed chassis. |
Use Scenario: Generating variable 15–30 V lab supply rails from fixed 5 V USB-C or bench supply in portable test fixtures. IC Role / Device Role / Timing Role: Adjustable boost regulator; output set via precision potentiometer on FB divider for user-tunable voltage. Use Value: Leverages 1.230 V reference with <1.5 mV line regulation drift to maintain tight output accuracy across input variations. |
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 |
|---|---|---|---|
| LM2588MX-ADJ/NOPB | Higher 65 V input rating (vs. 40 V), same 5-A switch, but no internal soft-start; requires external soft-start circuit. | Better suited for 48 V industrial systems with transient overvoltage; less suitable for low-input brownout resilience. | Select when input may exceed 40 V; verify external soft-start implementation for controlled startup. |
| LM5008AMM/NOPB | Higher 100 V input rating, 500 mA switch current, 1 MHz switching, smaller 8-pin VSSOP package; not pin-compatible. | Targets low-power, space-constrained applications; cannot replace LM2587SX-ADJ/NOPB in 5-A designs without topology change. | Choose for new low-current designs prioritizing size and high-frequency operation; not a drop-in replacement. |
Compared with LM2587SX-ADJ/NOPB, LM2588MX-ADJ/NOPB extends input voltage capability but sacrifices integrated soft-start, while LM5008AMM/NOPB trades current capacity and package compatibility for higher frequency and smaller footprint - making each suitable only for distinct power-level and layout constraints.
Availability
LM2587SX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial DC power supplies, automotive battery backup systems, and telecom remote power feeding requiring stable component supply and long-term production continuity.
Supply support for LM2587SX-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 specializing in analog and embedded processing technologies, with decades of expertise in power management ICs and high-reliability industrial solutions.
The LM2587 product line was designed specifically for cost-sensitive, high-efficiency flyback, boost, and forward converter applications where minimal external components and robust protection features are essential - targeting industrial, automotive, and telecom infrastructure markets.
FAQ
What is the minimum input voltage required for stable operation of the LM2587SX-ADJ/NOPB?
The LM2587SX-ADJ/NOPB has a recommended operating input voltage range of 4 V to 40 V. Below 4 V, undervoltage lockout activates (threshold is 3.30 V, with 3.05–3.75 V tolerance), disabling the switch. Stable regulation requires VIN ≥4 V under all load and temperature conditions to ensure proper error amplifier biasing and oscillator function. The LM2587SX-ADJ/NOPB will not operate below this threshold.
Can the LM2587SX-ADJ/NOPB be used in a non-isolated boost configuration?
Yes, the LM2587SX-ADJ/NOPB is explicitly validated for non-isolated boost regulator use, as shown in Figure 16 and Section 7.3.1 of the datasheet. It requires only an inductor, Schottky diode, input/output capacitors, and feedback resistors. The LM2587SX-ADJ/NOPB's 65 V switch rating supports output voltages up to ~40 V from a 12 V input, provided external components are rated accordingly.
What is the purpose of the COMP pin on the LM2587SX-ADJ/NOPB?
On the LM2587SX-ADJ/NOPB, the COMP pin is the output of the internal transconductance error amplifier (3.2 mmho typ). It interfaces with an external RC compensation network (Type II or III) to stabilize the control loop. This pin directly controls PWM duty cycle via the internal comparator and must not be shorted or left floating. Proper compensation is essential for maintaining ±4% output tolerance across line, load, and temperature for the LM2587SX-ADJ/NOPB.
How does the LM2587SX-ADJ/NOPB achieve ±4% system output voltage tolerance?
The LM2587SX-ADJ/NOPB achieves ±4% total system output tolerance through a combination of its 1.230 V reference voltage (±2.2% over temperature), low-feedback-pin bias current (<600 nA), current-mode control rejecting input ripple, and internal soft-start limiting startup overshoot. This specification applies across full input (4–40 V), load (up to rated current), and temperature (−40°C to +125°C) ranges - verified in production testing per the LM2587SX-ADJ/NOPB datasheet.
Is the LM2587SX-ADJ/NOPB RoHS-compliant and lead-free?
Yes, the LM2587SX-ADJ/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (Texas Instruments' standard designation for lead-free, RoHS-compliant packaging). It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards - confirmed in TI's official packaging documentation for the LM2587SX-ADJ/NOPB.
LM2587SX-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:
- Tape & Reel (TR)
- 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)
LM2587SX-ADJ/NOPB FAQ
1.How can I place an order for LM2587SX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2587SX-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 LM2587SX-ADJ/NOPB reliable?
The price and inventory of LM2587SX-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 LM2587SX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2587SX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2587SX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2587SX-ADJ/NOPB?
LM2587SX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2587SX-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 LM2587SX-ADJ/NOPB?
For technical support, including LM2587SX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2587SX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2587SX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2587SX-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 LM2587SX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2587SX-ADJ/NOPB?
All LM2587SX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2587SX-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 LM2587SX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2587SX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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