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Texas Instruments LM2588S-5.0/NOPB
- Part No.:
- LM2588S-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2588S-5.0/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK 5V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:360
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Product details
Overview
LM2588S-5.0/NOPB from Texas Instruments is a monolithic 5-A flyback/boost regulator IC with fixed 5.0 V output, NPN internal switch rated for 65 V standoff and 5 A peak current, 4–40 V input range, adjustable 100–200 kHz switching frequency, and external shutdown control - used in isolated DC-DC power supplies for industrial instrumentation and telecom line cards.
For engineers reviewing the LM2588S-5.0/NOPB datasheet, LM2588S-5.0/NOPB pinout, LM2588S-5.0/NOPB application, or LM2588S-5.0/NOPB equivalent, key selection criteria include its ±4% system output voltage tolerance over line/load, current-mode control architecture for transient immunity, integrated soft-start to limit in-rush, thermal/UVLO protection, and compatibility with standard flyback transformers per TI's recommended inductor family.
Technical Context
The LM2588S-5.0/NOPB implements current-mode PWM control with an internal 1.23 V reference, error amplifier (transconductance: 0.75 mmho typ), and comparator comparing sensed switch current against error amp output. Its oscillator supports resistor-programmed frequency (100–200 kHz) or external synchronization via pin 6.
It integrates undervoltage lockout (3.3 V threshold), thermal shutdown, cycle-by-cycle current limiting (6.5 A typ), and soft-start (11 μA sink current). The NPN output switch exhibits 0.7 V saturation voltage at 5 A and sustains up to 65 V - enabling robust flyback operation without external high-voltage transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line/load/temperature range - ensures stable rail for downstream logic or analog circuitry without external feedback resistors. |
| Input Voltage Range | 4 V to 40 V - supports wide-input industrial and automotive battery-supplied systems, including 12 V and 24 V nominal rails. |
| Switch Current Limit | 6.5 A typical, 5.0 A minimum - defines maximum safe primary-side energy transfer in flyback designs and limits fault current during short-circuit events. |
| Switching Frequency | 100–200 kHz (resistor-adjustable or sync-capable) - balances magnetics size, EMI, and efficiency; 100 kHz default enables use of low-cost off-the-shelf transformers. |
| Shutdown Supply Current | 16 μA typical at VSH = 3 V - enables ultra-low-power standby in battery-backed systems without auxiliary LDOs. |
| Thermal Resistance (θJA) | 45 °C/W (TO-220, 4 in² copper) - dictates heatsink requirements; junction temperature must stay ≤125 °C under max load and ambient. |
| Reference Voltage | 5.0 V at FB pin (for 5-V version), with 3.3 mV line regulation - enables precise closed-loop regulation without trimming. |
Pinout & Package
LM2588S-5.0/NOPB is housed in a 7-pin TO-220 (NDZ) package with bent, staggered leads and exposed tab (internally connected to Pin 2). The tab serves as thermal path and electrical ground reference.
| 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 (draws 16 μA). |
| Pin 2: Ground | Power and signal reference | Common return for internal circuits, switch emitter, and thermal pad - must be low-impedance connection to PCB ground plane. |
| Pin 3: Feedback | Output voltage sensing input | Internally compared to 5.0 V reference; open for fixed 5-V operation - no external divider required. |
| Pin 4: Compensation | Error amplifier output | Connects to RC network for loop stability; transconductance 0.75 mmho enables predictable type-II compensation design. |
| Pin 5: Input | Main power supply input | Accepts 4–40 V DC; includes UVLO (3.3 V threshold) and feeds internal bias circuitry - decoupling capacitor mandatory. |
| Pin 6: Sync | External frequency synchronization input | Accepts negative-going pulses to align switching edge with system clock - eliminates beat frequencies in multi-rail supplies. |
| Pin 7: Switch | NPN collector output | Drives transformer primary or boost inductor; rated 65 V standoff, 5 A peak - requires snubber and proper layout for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast transient response, inherent cycle-by-cycle current limiting, and simplified loop compensation vs. voltage-mode. |
| Integrated soft-start | 11 μA constant-current sink on COMP pin ramps output voltage smoothly - prevents in-rush stress on input capacitors and transformer core. |
| Thermal + UVLO + current protection | Triple fault coverage: thermal shutdown (>150 °C), undervoltage lockout (<3.05 V), and internal current limit (≥5 A) - eliminates need for external protection circuitry. |
| Fixed 5.0 V output configuration | Internal feedback divider eliminates external resistors - reduces BOM count, improves accuracy (±4% system tolerance), and simplifies layout. |
| Sync-capable oscillator | Allows multiple LM2588S-5.0/NOPB units to operate at identical frequency - critical for noise-sensitive applications like data acquisition and RF subsystems. |
Applications
| Industrial Isolated Power | Telecom Line Card Supply |
|---|---|
Use Scenario: Providing isolated 5 V rail from 24 V or 48 V backplane in programmable logic controllers (PLCs) with galvanic separation between field I/O and CPU. IC Role / Device Role / Timing Role: Primary-side controller in flyback topology; regulates output using optocoupler feedback; operates at 100 kHz for optimal transformer size and EMI profile. Use Value: Eliminates need for external NPN transistor and discrete protection circuits while maintaining ±4% output accuracy across -40°C to +85°C ambient. |
Use Scenario: Generating 5 V for digital signal processors (DSPs) and interface ICs on telecom line cards powered from -48 V DC distribution. IC Role / Device Role / Timing Role: Boost converter front-end; steps up -48 V (absolute) to 5 V using inverting topology with external PNP pass device or charge-pump assist. Use Value: Leverages wide 4–40 V input range to accommodate degraded -48 V rails (down to -36 V) and maintains regulation during brownouts. |
| Test Equipment Auxiliary Supply | Automotive Body Control Module |
Use Scenario: Delivering clean, isolated 5 V for analog front-ends and ADC references in portable multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Flyback regulator with transformer-isolated secondary; uses TI-recommended standard inductor (e.g., Pulse PA0368.x series) for repeatable performance. Use Value: Achieves <100 mVpp output ripple and ±4% tolerance without post-regulation LDO - reducing component count and board space. |
Use Scenario: Powering microcontrollers and CAN transceivers in 12 V automotive body control modules requiring shutdown during ignition-off. IC Role / Device Role / Timing Role: Primary-side flyback controller with external ON/OFF pin driven by microcontroller GPIO; draws only 16 μA in shutdown. Use Value: Meets automotive quiescent current requirements (<50 μA) and supports cold-crank operation down to 4 V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587S-5.0/NOPB | Same pinout, but optimized for forward/boost-only (no flyback support); lacks sync pin and has lower 3.5 A switch rating. | Suitable for non-isolated boost where transformer isolation is unnecessary; not viable for flyback due to missing transformer drive capability. | Select LM2587S-5.0/NOPB only when isolation is not required and peak current stays below 3.5 A. |
| UC3845N | Current-mode PWM controller (not integrated switch); requires external MOSFET; 1 A gate drive; no built-in soft-start or UVLO. | Offers higher voltage/current flexibility (up to 400 V switch) but demands more external components and design effort for protection and compensation. | Choose UC3845N when custom high-voltage flyback (>65 V) or variable-output designs are needed - not a drop-in replacement. |
Compared with LM2587S-5.0/NOPB, LM2588S-5.0/NOPB adds flyback capability, sync functionality, and higher 5 A switch rating - making it uniquely suited for isolated 5 V supplies. Versus UC3845N, it trades design flexibility for integration, reducing BOM count and validation time at the cost of fixed topology constraints.
Availability
LM2588S-5.0/NOPB is available at Aetrix Electronics and suitable for industrial instrumentation, telecom line cards, and automotive body control modules requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for LM2588S-5.0/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2588S-5.0/NOPB belongs to TI's legacy monolithic flyback/boost regulator family, designed specifically for cost-sensitive, isolated DC-DC applications where integration, protection, and ease of use outweigh programmability needs.
FAQ
What is the maximum input voltage supported by the LM2588S-5.0/NOPB?
The LM2588S-5.0/NOPB supports a recommended operating input voltage range of 4 V to 40 V. Its absolute maximum input voltage rating is 45 V, but sustained operation above 40 V may compromise reliability and is not guaranteed per specifications. For automotive cold-crank scenarios, the device maintains regulation down to 4 V input - a key feature validated in TI's Electrical Characteristics table.
Does the LM2588S-5.0/NOPB require external feedback resistors to set the 5 V output?
No. The LM2588S-5.0/NOPB is a fixed-output variant with internal feedback divider configured for 5.0 V regulation. Pin 3 (Feedback) is internally connected to the 5.0 V reference and must be left unconnected - eliminating external resistors, trimming, and associated drift errors. This design directly enables the ±4% system output tolerance specification.
Can the LM2588S-5.0/NOPB be used in a flyback configuration?
Yes. The LM2588S-5.0/NOPB is explicitly designed for flyback, forward, and boost topologies. Its NPN switch (65 V standoff, 5 A peak), current-mode control, and dedicated transformer-drive timing make it ideal for flyback converters. TI provides reference designs (e.g., Figure 16 in SNVS117E) and recommends specific flyback transformers compatible with LM2588S-5.0/NOPB.
What thermal considerations apply to the LM2588S-5.0/NOPB in TO-220 package?
The LM2588S-5.0/NOPB in NDZ (TO-220) package has θJA = 45 °C/W with 4 in² of 1 oz. copper - meaning at 5 A load and 40 V input, thermal design must ensure junction temperature stays ≤125 °C. The exposed tab (Pin 2) must be soldered to a large copper pour; thermal vias under the tab improve heat transfer. Derating curves in the datasheet guide max continuous output current vs. ambient temperature.
How does the shutdown function work on the LM2588S-5.0/NOPB?
The LM2588S-5.0/NOPB uses Pin 1 (Freq Adj / ON-OFF) for shutdown: applying ≥3 V to this pin forces the device into low-power state, reducing supply current to 16 μA. An isolation diode (as shown in Figure 20 of SNVS117E) is required to prevent interference with frequency adjustment. During shutdown, the switch is disabled, COMP pin discharges, and output drops to zero - enabling clean system-level power sequencing.
LM2588S-5.0/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- 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)
LM2588S-5.0/NOPB FAQ
1.How can I place an order for LM2588S-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2588S-5.0/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-5.0/NOPB reliable?
The price and inventory of LM2588S-5.0/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-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2588S-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2588S-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2588S-5.0/NOPB?
LM2588S-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2588S-5.0/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-5.0/NOPB?
For technical support, including LM2588S-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2588S-5.0/NOPB requirements.
6.How does Aetrix verify that LM2588S-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2588S-5.0/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-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2588S-5.0/NOPB?
All LM2588S-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2588S-5.0/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-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2588S-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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