My Inquiry
My Account
Texas Instruments LM2588SX-ADJ/NOPB
- Part No.:
- LM2588SX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2588SX-ADJ/NOPB.pdf
- Description:
- IC REG BST FLYBACK ADJ 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,247
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2588SX-ADJ/NOPB from Texas Instruments is a monolithic 5-A flyback/boost/forward DC-DC regulator IC with adjustable output voltage, NPN internal switch rated for 65 V standoff and 5 A peak current, 4–40 V input range, and programmable 100–200 kHz switching frequency - used in isolated power supplies for industrial control and telecom infrastructure.
For engineers reviewing the LM2588SX-ADJ/NOPB datasheet, LM2588SX-ADJ/NOPB pinout, LM2588SX-ADJ/NOPB application, or LM2588SX-ADJ/NOPB equivalent, key selection criteria include its current-mode control architecture, ±4% system output tolerance over line/load, 1.23 V internal reference, external shutdown capability, and thermal/UVLO/overcurrent protection - all critical for reliable high-current isolated converter design.
Technical Context
The LM2588SX-ADJ/NOPB implements current-mode control using an internal error amplifier (transconductance: 3.2 mmho typ), comparator, and oscillator with external frequency adjustment via resistor on Pin 1. Its NPN power switch operates with cycle-by-cycle current limiting and soft-start to manage in-rush current.
It supports three topologies: flyback (isolated), boost (non-isolated step-up), and forward (isolated). Output voltage is set externally via resistive divider referencing the 1.23 V internal bandgap; feedback pin voltage must be regulated to 1.23 V for stable operation.
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. |
| Switch Current Limit | 5.0 A typical - defines maximum peak primary-side current in flyback/boost designs. |
| Switch Breakdown Voltage | 65 V - enables use with ≤60 V output flyback designs or ≤40 V input boost converters with margin. |
| Reference Voltage | 1.230 V ±2.2% - sets precision of output regulation when used with external R1/R2 divider. |
| Switching Frequency | 100–200 kHz (adjustable) - balances magnetics size, efficiency, and EMI in compact isolated supplies. |
| Output Tolerance | ±4% max over line, load, and temperature - ensures stable downstream logic or analog rail operation. |
| Shutdown Supply Current | 16 μA typ - enables ultra-low-power standby in battery-backed systems. |
Pinout & Package
LM2588SX-ADJ/NOPB is packaged in a 7-pin DDPAK/TO-263 (KTW) surface-mount package with exposed thermal pad, measuring 14.986 mm × 10.16 mm, optimized for high-power dissipation in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Freq Adj / ON-OFF | Frequency programming & shutdown control | Resistor-to-ground sets switching frequency (100–200 kHz); ≥3 V applied shuts down device. |
| Pin 2: Ground | Power and signal reference | Common return for internal circuitry, switch emitter, and compensation network - requires low-impedance PCB plane. |
| Pin 3: Feedback | Output voltage sensing input | Compares divided output voltage against 1.23 V internal reference to regulate output. |
| Pin 4: Compensation | Error amplifier output | Connects RC network to stabilize loop response; transconductance = 3.2 mmho (typ) at 25°C. |
| Pin 5: Input Voltage | Main power supply input | Accepts 4–40 V DC; feeds internal bias circuitry and switch collector via internal diode. |
| Pin 6: Sync | External frequency synchronization | Falling-edge triggered; allows multiple LM2588 devices to operate at same frequency to reduce beat noise. |
| Pin 7: Switch | NPN transistor collector | Drives primary winding of transformer (flyback/forward) or inductor (boost); rated 65 V, 5 A peak. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response, inherent cycle-by-cycle current limiting, and simplified loop compensation. |
| Internal soft-start | Reduces in-rush current during startup by gradually increasing peak switch current over ~10 ms. |
| Thermal shutdown & UVLO | Protects against overheating (>150°C junction) and brownout (UVLO threshold = 3.3 V typ). |
| Adjustable frequency | Allows optimization of magnetic size and EMI profile using single external resistor (22 kΩ → 200 kHz). |
| System-level ±4% output tolerance | Guarantees tight regulation across full operating conditions without external trimming. |
Applications
| Industrial Isolated Power Supply | Telecom DC-DC Boost Converter |
|---|---|
|
Use Scenario: Providing isolated 12 V/2 A auxiliary rail from 24 V bus in PLC I/O modules. IC Role / Device Role / Timing Role: Flyback controller regulating isolated secondary output; switch operates at 125 kHz with current-mode timing. Use Value: Eliminates need for external gate driver or optocoupler feedback; achieves ±4% regulation with minimal external parts. |
Use Scenario: Generating 48 V from 24 V input for PoE midspan power sourcing equipment. IC Role / Device Role / Timing Role: Boost regulator with NPN switch driving discrete inductor; 200 kHz operation minimizes inductor volume. Use Value: Delivers >5 A peak switch current enabling high-efficiency 48 V @ 1.5 A output without external MOSFET. |
| Automotive Body Control Module | Test Equipment Auxiliary Supply |
|
Use Scenario: Generating isolated 5 V rail from 12 V battery in vehicle gateway ECUs with cold-crank immunity. IC Role / Device Role / Timing Role: Flyback controller with UVLO (3.3 V) and thermal shutdown protecting against engine cranking dips. Use Value: Maintains regulation down to 4 V input and survives 40 V load-dump transients via 65 V switch rating. |
Use Scenario: Compact 15 V/1 A lab-grade supply for portable test instrumentation powered from USB-C PD. IC Role / Device Role / Timing Role: Adjustable-output boost regulator synchronized to system clock via Pin 6 to suppress EMI. Use Value: Enables precise 15 V output (R1=10.2 kΩ, R2=1 kΩ) with <100 mVpp ripple and synchronized switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2577SX-ADJ/NOPB | 3-A switch, fixed 52 kHz frequency, no sync pin, lower input voltage limit (3.5 V) | Suitable for lower-power non-synchronized boost; lacks flyback transformer drive capability and frequency adjust. | Select when cost-sensitive, lower-current (<2 A) boost is sufficient and EMI synchronization is unnecessary. |
| UCC28C43D | Current-mode PWM controller (external MOSFET), 1 A start-up current, no integrated switch | Requires external N-channel MOSFET and bootstrap circuit; supports higher voltages (>100 V) and frequencies up to 1 MHz. | Select when designing >65 V output flyback or needing >5 A output with discrete FET optimization and layout flexibility. |
Compared with LM2577SX-ADJ/NOPB, LM2588SX-ADJ/NOPB delivers 67% higher switch current and programmable frequency for better EMI control; compared with UCC28C43D, it integrates the 5-A NPN switch and reference, reducing BOM count but limiting max voltage to 65 V.
Availability
LM2588SX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC-DC conversion, automotive body electronics, and test equipment requiring stable component supply and long-term manufacturability.
Supply support for LM2588SX-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, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM2588 product line was designed specifically for cost-effective, high-current isolated and non-isolated DC-DC conversion in space- and thermal-constrained applications where integration of switch and control reduces design complexity.
FAQ
What is the maximum output voltage achievable with LM2588SX-ADJ/NOPB in flyback configuration?
The LM2588SX-ADJ/NOPB does not impose a hard upper limit on output voltage in flyback mode - it depends on transformer turns ratio, input voltage, and switch voltage rating. With its 65 V switch breakdown voltage and typical 4–40 V input range, practical isolated outputs up to 48 V are common; higher voltages require careful derating and snubber design. The LM2588SX-ADJ/NOPB itself regulates based on feedback divider, so output is set solely by R1/R2 values per VOUT = 1.23 × (1 + R1/R2).
Can LM2588SX-ADJ/NOPB be used in boost configuration without isolation?
Yes, LM2588SX-ADJ/NOPB is explicitly qualified for non-isolated boost operation per TI's datasheet Figure 17 and Section 7.3.2. It drives an external inductor and diode to generate output voltages greater than VIN, with peak switch current limited to 5 A. For example, with 12 V input and 24 V output, the LM2588SX-ADJ/NOPB delivers up to ~1.8 A continuous output while maintaining ±4% regulation and thermal safety.
What is the purpose of the Sync pin (Pin 6) on LM2588SX-ADJ/NOPB?
The Sync pin (Pin 6) on LM2588SX-ADJ/NOPB accepts a negative-going TTL-compatible pulse to synchronize the internal oscillator to an external clock source. This eliminates beat frequencies in multi-rail systems and reduces conducted EMI by aligning switching edges. A 700 ns delay exists between sync pulse edge and switch turn-on, as verified in TI's Figure 22 waveform capture. The LM2588SX-ADJ/NOPB remains fully functional without sync signal - defaulting to its programmed or open-circuit frequency.
How does the shutdown function work on LM2588SX-ADJ/NOPB?
LM2588SX-ADJ/NOPB uses Pin 1 (Freq Adj / ON-OFF) for shutdown: applying ≥3 V to this pin forces the device into low-power shutdown mode, drawing only 16 μA total supply current (100 μA max per datasheet). An isolation diode is required between control logic and Pin 1 to prevent interference with frequency adjustment. To resume operation, remove the voltage and leave Pin 1 floating - the LM2588SX-ADJ/NOPB automatically exits shutdown and initiates soft-start.
What thermal considerations apply to LM2588SX-ADJ/NOPB in TO-263 package?
The LM2588SX-ADJ/NOPB in KTW (DDPAK/TO-263) package has θJA = 26°C/W with 1.0064 in² copper area (7.4× package size), per datasheet Table 6.8. To maintain TJ ≤125°C at full 5 A load, PCB layout must include ≥1 in² of 1 oz. copper tied to the exposed thermal pad. Without adequate copper, junction temperature can exceed limits rapidly - e.g., θJA rises to 56°C/W with minimal copper, limiting safe continuous current to ~2.5 A at 25°C ambient. Thermal shutdown activates at 150°C.
LM2588SX-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:
- 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 ~ 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-ADJ/NOPB FAQ
1.How can I place an order for LM2588SX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2588SX-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 LM2588SX-ADJ/NOPB reliable?
The price and inventory of LM2588SX-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 LM2588SX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2588SX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2588SX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2588SX-ADJ/NOPB?
LM2588SX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2588SX-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 LM2588SX-ADJ/NOPB?
For technical support, including LM2588SX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2588SX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2588SX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2588SX-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 LM2588SX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2588SX-ADJ/NOPB?
All LM2588SX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2588SX-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 LM2588SX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2588SX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2588SX-ADJ/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
