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Texas Instruments LM2591HVSX-ADJ/NOPB
- Part No.:
- LM2591HVSX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2591HVSX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,080
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Product details
Overview
LM2591HVSX-ADJ/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter IC designed for high-input-voltage industrial and automotive power supplies. It delivers up to 1 A output current, supports input voltages up to 60 V, features a fixed 150-kHz switching frequency, and provides adjustable output voltage from 1.2 V to 57 V with ±4% regulation accuracy over line and load. It is used in on-card switching regulators requiring robust input transient handling.
For engineers reviewing the LM2591HVSX-ADJ/NOPB datasheet, LM2591HVSX-ADJ/NOPB pinout, LM2591HVSX-ADJ/NOPB application, or LM2591HVSX-ADJ/NOPB equivalent, key selection criteria include its 60-V max input rating, 1-A continuous output capability, ON/OFF control interface, thermal shutdown protection, and compatibility with standard buck external component sets (Schottky catch diode, 52–100 µH inductor, electrolytic input/output capacitors).
Technical Context
The LM2591HVSX-ADJ/NOPB integrates a PWM controller, power switch, and internal compensation network in a single chip. Its 150-kHz fixed-frequency oscillator enables predictable EMI behavior and allows use of compact filter components-inductors as small as 52 µH and 470-µF input capacitors-without requiring external frequency synchronization or loop compensation components.
It operates in continuous conduction mode (CCM) at full load and transitions to discontinuous conduction mode (DCM) under light loads. Feedback is sensed via an internal 1.23-V reference applied to the FB pin, enabling precise output adjustment using a two-resistor divider; bias current into FB is only 10–50 nA, minimizing divider error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial inputs including 24-V, 36-V, and 48-V rails without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and analog front-ends in embedded systems. |
| Switching Frequency | 127–173 kHz (typ. 150 kHz) - enables use of low-cost, off-the-shelf inductors and reduces size vs. lower-frequency alternatives. |
| Feedback Reference | 1.23 V ±2.7% - sets output via external resistor divider; low 10–50 nA bias current preserves accuracy with high-value dividers. |
| Standby Current | 90 µA typ. - enables ultra-low-power shutdown for battery-backed or energy-sensitive applications. |
| Thermal Protection | Internal thermal shutdown - disables switching above 150°C junction temperature, preventing damage during overload or poor heatsinking. |
| Current Limit | 1.3–2.8 A peak - protects internal switch during short-circuit or startup; minimum limit of 1.2 A ensures safe operation across temperature. |
Pinout & Package
LM2591HVSX-ADJ/NOPB is supplied in a 5-pin DDPAK/TO-263 surface-mount package (body size 10.18 mm × 8.41 mm), optimized for high-power dissipation with exposed thermal pad connected to Pin 3 (Ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: +VIN | Positive input supply | Accepts up to 60 V DC; requires local 470-µF low-ESR aluminum electrolytic capacitor to handle high RMS input ripple current. |
| 2: Output | Switch node | Connects to cathode of Schottky catch diode and inductor; swings between ~(+VIN − 1.2 V) and ~−0.5 V during operation. |
| 3: Ground | Power and signal reference | Must be tied to PCB thermal pad and low-impedance ground plane; serves as return path for switch current and feedback reference. |
| 4: Feedback | Regulation sense input | Monitors output via resistive divider; internal 1.23-V reference compares against divider voltage to maintain regulation. |
| 5: ON/OFF | Shutdown control | Drives high (≥2 V) to enter 90-µA standby; floats or pulled low (≤0.6 V) for normal operation; threshold is 1.3 V typical. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | Supports direct connection to unregulated 24-V, 36-V, or 48-V industrial buses without external pre-regulator. |
| Adjustable output (1.2–57 V) | Enables single BOM to support multiple output rails (e.g., 3.3 V, 5 V, 12 V, 24 V) using only resistor changes. |
| Integrated thermal shutdown | Automatically disables switching at 150°C junction temperature, eliminating need for external thermal monitoring circuitry. |
| Low-quiescent-current shutdown | Draws only 90 µA in OFF state-critical for always-on systems powered from batteries or energy-harvesting sources. |
| Fixed 150-kHz oscillator | Provides deterministic switching frequency for EMI filtering design and avoids audible noise in sensitive applications. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24-V vehicle battery to stable 5-V rail for MCU and CAN transceivers in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 5-V supply with input transient tolerance up to 60 V (load dump). Use Value: Eliminates need for discrete pre-regulator stage; withstands automotive load dump pulses without derating or external clamping. |
Use Scenario: Generating 3.3-V logic supply from 12-V battery in engine control units where space and thermal margin are constrained. IC Role / Device Role / Timing Role: Compact, thermally robust step-down converter delivering 1-A output in TO-263 package with integrated thermal protection. Use Value: Reduces board area vs. linear regulators; achieves >77% efficiency at 12-V input, minimizing heat sink requirements. |
| Programmable Logic Controller (PLC) I/O Module | Telecom Remote Radio Unit (RRU) |
|
Use Scenario: Powering isolated analog sensor interfaces and digital I/O drivers from 48-V backplane in modular PLC chassis. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured for 12-V or 24-V auxiliary rails, supporting multiple fieldbus standards. Use Value: Single part number accommodates varying module requirements; ±4% output tolerance ensures reliable ADC reference stability. |
Use Scenario: Providing 5-V bias to RF power amplifiers and 3.3-V logic to FPGAs in outdoor base station RRUs operating from -40°C to +85°C. IC Role / Device Role / Timing Role: High-reliability buck converter rated for extended temperature range (-40°C to +125°C junction). Use Value: Maintains regulation across full industrial temp range; thermal shutdown prevents latch-up during ambient temperature excursions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596HV-ADJ/NOPB | Higher 3-A output current, 150-kHz frequency, but larger TO-220-5 package and higher quiescent current (5 mA active vs. 10 mA for LM2591HVSX-ADJ/NOPB). | Better suited for higher-current loads (>1 A); less suitable for space-constrained SMT designs due to through-hole footprint. | Select when output current exceeds 1 A and thermal management permits TO-220 mounting. |
| TPS54160DGQ | 60-V input, 1.5-A output, 100–2500-kHz adjustable frequency, integrated high-side MOSFET, but requires external compensation and has stricter layout sensitivity. | Offers greater flexibility in EMI optimization and efficiency tuning; demands more design effort for loop stability verification. | Select when programmable frequency, higher efficiency at light loads, or tighter output tolerance (<±1%) is required. |
Compared with LM2591HVSX-ADJ/NOPB, LM2596HV-ADJ/NOPB trades SMT convenience for higher current capacity, while TPS54160DGQ replaces simplicity with configurability-making LM2591HVSX-ADJ/NOPB optimal for cost-sensitive, space-limited 1-A buck applications needing minimal external components and proven layout robustness.
Availability
LM2591HVSX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) modules requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.
Supply support for LM2591HVSX-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, embedded processing, and power management technologies, with decades of experience in high-reliability power conversion solutions.
The LM2591HV series was developed as part of TI's SIMPLE SWITCHER® portfolio to deliver rugged, easy-to-use DC-DC buck regulators for harsh-environment applications including industrial automation, transportation, and telecom infrastructure.
FAQ
What is the maximum input voltage supported by the LM2591HVSX-ADJ/NOPB?
The LM2591HVSX-ADJ/NOPB supports a maximum input voltage of 60 V, with absolute maximum rating of 63 V. This allows direct operation from 24-V, 36-V, and 48-V industrial or automotive bus systems, including transient conditions like ISO 7637-2 load dump pulses. Operation above 60 V risks permanent damage and violates recommended operating conditions.
How is the output voltage set on the LM2591HVSX-ADJ/NOPB?
The LM2591HVSX-ADJ/NOPB uses a resistive voltage divider connected between output and ground, with the midpoint feeding the Feedback (FB) pin. The internal 1.23-V reference compares against this divided voltage; output voltage is calculated as VOUT = 1.23 × (1 + R1/R2). Resistor values must be selected for ≤1% tolerance to maintain the ±4% overall output accuracy specified for the LM2591HVSX-ADJ/NOPB.
Does the LM2591HVSX-ADJ/NOPB require external compensation components?
No, the LM2591HVSX-ADJ/NOPB includes internal frequency compensation and is designed for stable operation with standard external components: a Schottky catch diode, 52–100 µH inductor, and aluminum electrolytic input/output capacitors. Unlike many current-mode controllers, it does not require external Type II or Type III compensation networks-simplifying design and reducing BOM count for the LM2591HVSX-ADJ/NOPB.
What thermal considerations apply to the LM2591HVSX-ADJ/NOPB in a 1-A application?
In a 1-A application at 12-V input and 5-V output, the LM2591HVSX-ADJ/NOPB dissipates approximately 0.7 W. With its KTT (DDPAK/TO-263) package offering 50°C/W junction-to-ambient thermal resistance, this yields ~35°C rise above ambient-well within the 125°C max operating junction temperature. Adequate copper pour on the thermal pad and minimal trace length to ground are essential to realize this rating for the LM2591HVSX-ADJ/NOPB.
Can the LM2591HVSX-ADJ/NOPB be used in a negative-output (inverting) configuration?
Yes, the LM2591HVSX-ADJ/NOPB can be configured as a positive-to-negative inverting regulator by bootstrapping the GND pin to the negative output and referencing FB to system ground. This topology supports outputs such as –5 V or –12 V, but requires additional diodes (D1, D3) and careful attention to voltage stress-the sum of |VIN| + |VOUT| must remain ≤60 V. Full implementation guidance is provided in TI's LM2591HV datasheet for the LM2591HVSX-ADJ/NOPB.
LM2591HVSX-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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 57V
- Current - Output:
- 1A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2591HVSX-ADJ/NOPB FAQ
1.How can I place an order for LM2591HVSX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2591HVSX-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 LM2591HVSX-ADJ/NOPB reliable?
The price and inventory of LM2591HVSX-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 LM2591HVSX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2591HVSX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2591HVSX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2591HVSX-ADJ/NOPB?
LM2591HVSX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2591HVSX-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 LM2591HVSX-ADJ/NOPB?
For technical support, including LM2591HVSX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2591HVSX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2591HVSX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2591HVSX-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 LM2591HVSX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2591HVSX-ADJ/NOPB?
All LM2591HVSX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2591HVSX-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 LM2591HVSX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2591HVSX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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