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Texas Instruments LM2588SX-12/NOPB
- Part No.:
- LM2588SX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2588SX-12/NOPB.pdf
- Description:
- IC REG BST FLYBACK 12V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,039
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Product details
Overview
LM2588SX-12/NOPB from Texas Instruments is a monolithic 5-A flyback/boost regulator IC with fixed 12 V output, integrated 65 V NPN switch, adjustable 100–200 kHz switching frequency, ±4% system output voltage tolerance, and external shutdown control. It operates across 4 V to 40 V input, delivers up to 1.2 A load in flyback configuration, and supports synchronized multi-device operation for noise-sensitive industrial power supplies.
For engineers reviewing the LM2588SX-12/NOPB datasheet, LM2588SX-12/NOPB pinout, LM2588SX-12/NOPB application, or LM2588SX-12/NOPB equivalent, key selection criteria include its fixed 12 V output architecture, TO-263-7 (KTW) thermal performance (θJA = 26°C/W with 7.4× package copper), current-mode control for line/load transient rejection, soft-start function limiting in-rush current, and undervoltage lockout at 3.3 V nominal.
Technical Context
The LM2588SX-12/NOPB implements current-mode PWM control using an internal error amplifier (VREF = 12.0 V, ΔVREF ≤ 7.8 mV over 4–40 V input), comparator, and oscillator with external RSET-based frequency tuning. Its NPN power switch features 65 V sustaining voltage, 0.7 V typical saturation voltage at 5 A, and cycle-by-cycle current limiting set at 6.5 A typical.
Shutdown is asserted via pin 1 (ON/OFF) at ≥1.6 V threshold, reducing supply current to 16 μA typical; synchronization occurs on pin 6 (SYNC) with 0.75 V threshold and 100 μA input current. Thermal shutdown activates above 150°C junction temperature, and undervoltage lockout disables operation below 3.05 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over line/load/temperature - ensures stable rail for downstream logic or analog circuitry without external feedback resistors. |
| Input Voltage Range | 4 V to 40 V - supports wide-range DC inputs including automotive battery (9–16 V), industrial 24 V, and telecom 36 V systems. |
| Switch Current Limit | 6.5 A typical - sets peak primary-side current limit in flyback designs, enabling reliable energy transfer with standard magnetics. |
| Switching Frequency | 100–200 kHz (adjustable via RSET) - balances efficiency vs. size: lower frequencies improve conduction loss; higher frequencies shrink transformer/capacitor footprint. |
| Thermal Resistance (θJA) | 26°C/W (KTW package, 7.4× copper area) - enables 3.5 W continuous dissipation at 125°C max junction temp with 70°C ambient, critical for unheatsinked PCB layouts. |
| Shutdown Supply Current | 16 μA typical - reduces standby power in battery-backed or energy-conscious systems, e.g., remote sensors or IoT gateways. |
| Reference Voltage Accuracy | 12.0 V ±2.4% (min/max over temp) - defines absolute output regulation envelope; combined with feedback divider tolerance, determines total system VOUT error budget. |
Pinout & Package
LM2588SX-12/NOPB uses the 7-pin DDPAK/TO-263 (KTW) package (14.986 mm × 10.16 mm), optimized for high-power density and thermal performance on PCBs with extended copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FREQ/ON-OFF | Frequency adjust & shutdown control | Resistor-to-ground sets switching frequency (100–200 kHz); ≥1.6 V applied here forces shutdown - requires isolation diode for safe external control. |
| 2 - GND | Power and signal ground reference | Common return for internal circuits, switch emitter, and compensation network - must connect to low-impedance PCB ground plane. |
| 3 - FEEDBACK | Output voltage sensing input | Monitors regulated output via resistor divider; internal 12 V reference compares against divided voltage to maintain regulation - not used in fixed-12V version. |
| 4 - OUTPUT | NPN switch collector | High-side switching node connected to transformer primary or boost inductor - sustains 65 V, handles 5 A peak, requires snubber for voltage spike suppression. |
| 5 - COMP | Error amplifier output | Drives external RC compensation network to stabilize loop response - source/sink capability of 165 μA supports Type II/III compensation design. |
| 6 - SYNC | External frequency synchronization input | Accepts negative-going sync pulses to align switching edges with system clock - eliminates beat frequencies in multi-rail power systems. |
| 7 - VIN | Main input supply connection | 4–40 V DC input with undervoltage lockout at 3.05 V - requires local 10 μF ceramic + bulk electrolytic capacitance for ripple suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Improves line and load transient response by directly regulating inductor current per cycle - eliminates need for complex loop compensation in most flyback designs. |
| Internal soft-start | 11 μA constant-current ramp into compensation pin limits in-rush current during startup - prevents input capacitor stress and output overshoot in high-capacitance loads. |
| 65 V NPN switch with thermal/UVLO protection | Enables direct interface with 48 V industrial buses or automotive cold-crank (6 V min) while preventing damage from overtemperature (150°C cutoff) or brownout (3.05 V UVLO). |
| Adjustable 100–200 kHz switching frequency | Allows optimization of magnetic size vs. efficiency: 100 kHz maximizes efficiency with larger cores; 200 kHz minimizes transformer volume for space-constrained applications. |
| External shutdown with sub-20 μA quiescent draw | Supports low-power sleep modes in portable or always-on equipment - shutdown state draws only 16 μA from VIN, extending battery life or reducing no-load losses. |
Applications
| Industrial AC/DC Auxiliary Power | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Generating isolated 12 V bias supply from 24 V DC bus for PLC I/O modules, sensor interfaces, and relay drivers. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated secondary output - manages transformer energy transfer timing and current limiting per switching cycle. Use Value: Eliminates need for external feedback optocoupler or TL431; fixed 12 V output simplifies BOM and layout while maintaining ±4% regulation across -40°C to +125°C. |
Use Scenario: Providing robust 12 V rail for microcontroller, CAN transceiver, and LED drivers in vehicle door modules under cold-crank (6 V) and load-dump (36 V) conditions. IC Role / Device Role / Timing Role: Boost regulator operating from battery input - controls inductor current ramp and diode conduction timing to sustain regulated output during voltage dips. Use Value: Wide 4–40 V input range accommodates full automotive transient profile; 65 V switch withstands load-dump spikes without external clamping. |
| Telecom Remote Radio Unit (RRU) | Medical Patient Monitoring Auxiliary Supply |
|
Use Scenario: Delivering 12 V at 1 A from 48 V backplane to power RF front-end bias circuits in outdoor base stations. IC Role / Device Role / Timing Role: Synchronized flyback controller - aligns switching edge with system clock via SYNC pin to suppress conducted EMI in sensitive RF bands. Use Value: Frequency synchronization eliminates heterodyne noise; TO-263 thermal performance enables >3 W dissipation without heatsink in sealed enclosures. |
Use Scenario: Isolated 12 V supply for analog front-end and display backlight in portable ECG monitors powered by Li-ion battery packs (8–12.6 V). IC Role / Device Role / Timing Role: Flyback regulator with shutdown control - enables microcontroller to disable power stage during sleep intervals to reduce system standby current. Use Value: 16 μA shutdown current extends battery runtime; ±4% output tolerance ensures ADC reference stability and consistent LED brightness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2588T-12/NOPB | Same electrical specs but TO-220-7 (NDZ) package - θJA = 45°C/W (4 in² copper), larger footprint, vertical mounting required. | Preferred where mechanical height constraints allow TO-220 and thermal mass from heatsink is available. | Select LM2588T-12/NOPB when board space permits vertical heatsinking and lower assembly cost is prioritized over thermal density. |
| LM5020MM-1/NOPB | Current-mode flyback controller (not integrated switch); requires external MOSFET; supports up to 100 V input; no fixed-output versions. | Suitable for higher-voltage (>60 V) or higher-efficiency designs where discrete FET selection and advanced protection features are needed. | Choose LM5020MM-1/NOPB when designing for >40 V input, needing programmable soft-start or OVP, or requiring MOSFET-level optimization. |
Compared with LM2588T-12/NOPB, LM2588SX-12/NOPB offers superior thermal performance in compact layouts due to its surface-mount TO-263 package, while LM5020MM-1/NOPB provides greater flexibility for high-input-voltage or custom-switch designs at the cost of increased component count and design complexity.
Availability
LM2588SX-12/NOPB is available at Aetrix Electronics and suitable for industrial automation power supplies, automotive body electronics, and telecom remote radio units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2588SX-12/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, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2588 series was designed specifically for cost-sensitive, high-current flyback and boost converter applications in industrial, automotive, and telecom infrastructure - emphasizing minimal external components, integrated protection, and robust thermal behavior.
FAQ
What is the maximum output current achievable with LM2588SX-12/NOPB in a flyback configuration?
The LM2588SX-12/NOPB supports up to 1.2 A output current in flyback topology under recommended operating conditions (VIN = 4–10 V, TJ ≤ 125°C). This limit arises from internal current limiting (6.5 A typical switch peak), transformer turns ratio, and thermal constraints of the TO-263 package - exceeding 1.2 A requires careful thermal design and may trigger thermal shutdown.
Does LM2588SX-12/NOPB require external feedback resistors to set the output voltage?
No. The LM2588SX-12/NOPB is a fixed-output variant with internal 12 V reference and trimmed feedback network - no external resistors are needed. Unlike the adjustable LM2588ADJ, this part integrates the voltage divider, simplifying design and improving accuracy by eliminating resistor tolerance and temperature drift effects on the LM2588SX-12/NOPB output.
Can LM2588SX-12/NOPB be used in boost configuration, and what are the key layout considerations?
Yes, LM2588SX-12/NOPB supports boost operation per TI's Figure 17. Critical layout practices include placing the input capacitor within 5 mm of pins 2 (GND) and 7 (VIN), routing the switch node (pin 4) with minimal area to reduce EMI, and using Kelvin connections for the sense resistor if adding external current limiting - all essential to maintain stability and efficiency in the LM2588SX-12/NOPB boost implementation.
What is the purpose of the FREQ/ON-OFF pin (pin 1) on LM2588SX-12/NOPB, and how should it be configured?
Pin 1 serves dual functions: connecting a resistor to ground sets switching frequency (100–200 kHz), while applying ≥1.6 V shuts down the LM2588SX-12/NOPB. For combined use, TI recommends an isolation diode between control logic and pin 1 - this prevents interference between frequency programming and shutdown signals, ensuring reliable operation in both modes without compromising the LM2588SX-12/NOPB's 16 μA shutdown current spec.
How does the LM2588SX-12/NOPB handle input undervoltage conditions?
The LM2588SX-12/NOPB incorporates undervoltage lockout (UVLO) that disables switching when VIN falls below 3.05 V (min), preventing erratic operation during brownouts. Hysteresis of ~0.7 V ensures clean turn-on at ~3.75 V, protecting downstream circuitry from unstable regulation - this behavior is fully specified in the Electrical Characteristics table and applies identically across all LM2588SX-12/NOPB units regardless of temperature or load.
LM2588SX-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- 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):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 5A (Switch)
- Frequency - Switching:
- 100kHz ~ 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2588SX-12/NOPB FAQ
1.How can I place an order for LM2588SX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2588SX-12/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 LM2588SX-12/NOPB reliable?
The price and inventory of LM2588SX-12/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2588SX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2588SX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2588SX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2588SX-12/NOPB?
LM2588SX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2588SX-12/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 LM2588SX-12/NOPB?
For technical support, including LM2588SX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2588SX-12/NOPB requirements.
6.How does Aetrix verify that LM2588SX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2588SX-12/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 LM2588SX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2588SX-12/NOPB?
All LM2588SX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2588SX-12/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 LM2588SX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2588SX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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