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Texas Instruments LM2588S-ADJ/NOPB
- Part No.:
- LM2588S-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2588S-ADJ/NOPB.pdf
- Description:
- IC REG BST FLYBACK ADJ 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
LM2588S-ADJ/NOPB from Texas Instruments is a monolithic 5-A flyback/boost/forward switching regulator IC with adjustable output voltage, NPN 65-V switch, 100–200 kHz programmable oscillator, current-mode control, and external shutdown. It operates from 4 V to 40 V input and delivers ±4% system output voltage tolerance over line and load.
For engineers reviewing the LM2588S-ADJ/NOPB datasheet, LM2588S-ADJ/NOPB pinout, LM2588S-ADJ/NOPB application, or LM2588S-ADJ/NOPB equivalent, key selection considerations include its 1.23-V internal reference, 5-A NPN switch with 65-V standoff, soft-start function, frequency synchronization capability, and thermal/UVLO/current-limit protection.
Technical Context
The LM2588S-ADJ/NOPB implements current-mode control using an internal error amplifier (transconductance up to 6.0 mmho, gain up to 670 V/V) comparing feedback voltage against a 1.23-V reference. Its oscillator supports resistor-programmed frequency (100–200 kHz) and external synchronization via pin 6.
It integrates undervoltage lockout (3.05–3.75 V), thermal shutdown, cycle-by-cycle current limiting (5.0–9.5 A), and soft-start with 11 μA typical charging current. The NPN power switch exhibits 0.7–1.4 V saturation voltage at 5 A and sustains up to 65 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Adjustable via external resistors; set by VOUT = 1.23 V × (1 + R1/R2) |
| Input Voltage Range | 4 V to 40 V - supports wide industrial and automotive battery-fed inputs |
| Switch Current Limit | 5.0–9.5 A - protects NPN transistor during overload or short-circuit conditions |
| Oscillator Frequency | 100–200 kHz - selectable with external resistor; enables magnetic size optimization |
| Reference Voltage | 1.230 V (±2.2% over temp) - high-accuracy feedback reference for stable regulation |
| Shutdown Supply Current | 16 μA typical - ultra-low quiescent draw when disabled via ON/OFF pin |
| Thermal Shutdown | 150°C junction limit - automatic recovery after cooling; prevents permanent damage |
| Output Tolerance | ±4% max over line/load/temp - ensures reliable downstream system operation |
Pinout & Package
LM2588S-ADJ/NOPB is available in TO-220 (NDZ, 7-pin) and DDPAK/TO-263 (KTW, 7-pin) packages. Both use identical pin numbering and functional assignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Freq Adj / ON-OFF) | Frequency programming & shutdown control | Resistor-to-ground sets oscillator frequency; ≥3 V applied shuts down device |
| 2 (Ground) | Power and signal reference | Common return path for internal circuits and external components |
| 3 (Feedback) | Output voltage sensing input | Compares divided output to 1.23-V internal reference; enables adjustable regulation |
| 4 (Compensation) | Error amplifier output | Connects external RC network to stabilize loop response and ensure stability |
| 5 (VIN) | Main power supply input | Accepts 4–40 V DC; powers internal circuitry and bias for NPN switch |
| 6 (Sync) | External frequency synchronization input | Falling-edge trigger synchronizes switching to external clock; eliminates beat frequencies |
| 7 (Switch) | NPN collector output | Drives primary of transformer (flyback) or inductor (boost); withstands 65 V |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Improves transient response, line/load regulation, and enables precise cycle-by-cycle current limiting |
| Internal soft-start | Reduces in-rush current during startup by gradually ramping peak switch current |
| Frequency synchronization | Enables multiple LM2588S-ADJ/NOPB units to operate at same frequency, eliminating interference |
| Protection suite | Combines undervoltage lockout (3.05–3.75 V), thermal shutdown, and current limiting for robust operation |
| Low shutdown current | Draws only 16 μA from VIN and 40 μA from ON/OFF pin in shutdown - ideal for battery systems |
| Wide input range | Operates from 4 V to 40 V - accommodates 12 V/24 V industrial rails and automotive cold-crank conditions |
Applications
| Industrial Flyback Power Supply | Automotive Boost Converter |
|---|---|
|
Use Scenario: Isolated 24 V to 12 V/5 V dual-output supply for PLC I/O modules with 4–40 V input tolerance. IC Role / Device Role / Timing Role: Primary-side controller implementing flyback topology with transformer isolation and adjustable secondary regulation. Use Value: Enables single-chip isolated conversion without optocoupler feedback compensation; ±4% output tolerance ensures sensor/interface reliability. |
Use Scenario: 12 V battery-powered boost converter generating 24 V for automotive camera systems during cold-crank (down to 4 V). IC Role / Device Role / Timing Role: Step-up regulator with current-mode control and soft-start to handle low-input transients. Use Value: 5-A NPN switch and 65-V standoff sustain operation through 4 V start-up; 100–200 kHz adjustability optimizes EMI and magnetics size. |
| Multi-Output Forward Converter | Programmable Lab Power Supply |
|
Use Scenario: 48 V input forward converter delivering regulated 5 V, 3.3 V, and 12 V outputs for telecom shelf management. IC Role / Device Role / Timing Role: Primary-side PWM controller with synchronized switching for multi-rail coordination. Use Value: Sync pin allows phase alignment across multiple rails; current-mode architecture rejects input ripple and load step disturbances. |
Use Scenario: Bench-top adjustable DC supply (1.23–30 V) with digital potentiometer-based R1/R2 setting and front-panel enable/disable. IC Role / Device Role / Timing Role: Core adjustable regulator with ON/OFF pin used for remote enable and soft-start for user safety. Use Value: 1.23-V reference and wide VOUT range support precise lab-grade adjustment; shutdown current <60 μA enables low-power standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2577S-ADJ/NOPB | 3-A switch, fixed 52 kHz frequency, no sync pin, lower max input (40 V same) | Limited to lower output current; unsuitable for >3 A loads or synchronized multi-rail designs | Choose when cost sensitivity outweighs current/frequency flexibility needs |
| UCC28C43DR | Current-mode PWM controller (no integrated switch), requires external MOSFET, 1–1 MHz freq range | Supports higher efficiency and power density but increases BOM count and design complexity | Prefer for >50 W designs requiring MOSFET optimization or >200 kHz operation |
Compared with LM2577S-ADJ/NOPB, the LM2588S-ADJ/NOPB provides 67% higher switch current and programmable frequency; versus UCC28C43DR, it reduces component count and layout risk by integrating the 5-A NPN switch and reference, at the cost of fixed topology constraints.
Availability
LM2588S-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial flyback supplies, automotive boost converters, telecom forward converters, and programmable lab power supplies requiring stable component supply and long-term manufacturability.
Supply support for LM2588S-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 company headquartered in Dallas, Texas, designing analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM2588 series was developed specifically for cost-sensitive, medium-power isolated and non-isolated DC-DC conversion - emphasizing minimal external parts, rugged protection, and flexible topology support (flyback, boost, forward).
FAQ
What is the maximum output voltage achievable with LM2588S-ADJ/NOPB?
The LM2588S-ADJ/NOPB has no intrinsic upper limit on output voltage - it is determined solely by the external resistor divider (R1/R2) and component ratings. Using the formula VOUT = 1.23 V × (1 + R1/R2), outputs up to 60 V are routinely implemented with appropriate transformer turns ratio (flyback) or inductor/diode voltage ratings (boost). The internal 65-V switch rating constrains maximum VSW, not VOUT.
Does LM2588S-ADJ/NOPB require an external diode for shutdown functionality?
Yes - TI's datasheet Figure 20 explicitly specifies an isolation diode between the ON/OFF pin (pin 1) and the external control signal. This prevents unintended current injection into the internal circuitry during normal operation and ensures clean shutdown activation when ≥3 V is applied. Omitting the diode risks latch-up or erratic behavior in the LM2588S-ADJ/NOPB.
Can LM2588S-ADJ/NOPB be used in a synchronous rectification configuration?
No - the LM2588S-ADJ/NOPB does not provide gate drive signals for synchronous rectifiers. Its output stage is a single NPN switch (pin 7), and the feedback loop assumes standard diode rectification. Synchronous operation would require external timing control and MOSFET drivers not supported by the LM2588S-ADJ/NOPB architecture.
What is the minimum recommended copper area for thermal management of LM2588S-ADJ/NOPB in TO-220 package?
For the NDZ (TO-220) package, TI specifies θJA = 45°C/W with ~4 in² of 1 oz. copper. Minimum practical copper area is 2 in² with thermal vias to inner layers; below this, junction temperature may exceed 125°C under full 5-A load. The datasheet recommends heatsinking for continuous >2.5 A output current in ambient >50°C.
How does the LM2588S-ADJ/NOPB achieve ±4% system output voltage tolerance?
The ±4% tolerance is guaranteed across line, load, and temperature for the complete power system - not just the IC. It results from the combination of the 1.23-V reference (±2.2%), resistor divider accuracy, PCB layout effects, and transformer/inductor tolerances. TI validates this spec using standardized test circuits (e.g., Figure 54/55) with specified external components - deviations occur if unapproved parts or layouts are used.
LM2588S-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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 ~ 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2588S-ADJ/NOPB FAQ
1.How can I place an order for LM2588S-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2588S-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 LM2588S-ADJ/NOPB reliable?
The price and inventory of LM2588S-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 LM2588S-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2588S-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2588S-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2588S-ADJ/NOPB?
LM2588S-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2588S-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 LM2588S-ADJ/NOPB?
For technical support, including LM2588S-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2588S-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2588S-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2588S-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 LM2588S-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2588S-ADJ/NOPB?
All LM2588S-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2588S-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 LM2588S-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2588S-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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