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Texas Instruments LM2591HVS-ADJ/NOPB
- Part No.:
- LM2591HVS-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2591HVS-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:675
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Product details
Overview
LM2591HVS-ADJ/NOPB from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter IC designed for high-input-voltage industrial and automotive power supplies. It delivers 1-A output current with adjustable output voltage (1.2 V to 57 V), operates up to 60-V input, features 150-kHz fixed-frequency switching, and includes ON/OFF control and thermal shutdown - used in on-card buck regulators requiring wide VIN range and stable regulation under varying load.
For engineers reviewing the LM2591HVS-ADJ/NOPB datasheet, LM2591HVS-ADJ/NOPB pinout, LM2591HVS-ADJ/NOPB application, or LM2591HVS-ADJ/NOPB equivalent, key selection criteria include feedback voltage accuracy (1.23 V ±3%), standby current (90 μA), saturation voltage (1.2 V at 1 A), oscillator frequency tolerance (±15%), and thermal protection behavior across −40°C to +125°C ambient.
Technical Context
The LM2591HVS-ADJ/NOPB implements a current-mode controlled buck topology with internal 150-kHz oscillator, integrated 1.9-A peak-current-limited N-channel DMOS switch, and voltage feedback loop referenced to a precision 1.23-V bandgap reference. Its feedback pin senses output via external resistor divider, enabling programmable regulation from 1.2 V to 57 V with ±4% total error over line, load, and temperature.
It supports active mode operation when ON/OFF pin is ≤0.6 V or floating, and enters low-power shutdown (ISTBY = 90 μA typ.) when ON/OFF ≥2 V. Protection includes thermal shutdown, two-stage current limiting, and absolute maximum ratings up to 63-V input and 25-V ON/OFF pin voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial rails including 24-V, 36-V, and 48-V systems without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and analog circuitry in embedded systems. |
| Feedback Voltage | 1.23 V ±3% - sets output via R1/R2 divider; enables precise 1.2–57 V adjustment with <±4% total output error. |
| Switching Frequency | 150 kHz ±15% - allows use of compact, low-cost 10–100 μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Quiescent Current | 90 μA typical in shutdown - minimizes battery drain in always-on or wake-on-event applications. |
| Saturation Voltage | 1.2 V max at 1 A - defines conduction loss in high-side switch; impacts efficiency especially at low VOUT. |
| Thermal Shutdown | Activates at TJ ≥150°C - protects device during overload or poor heatsinking; auto-recovery on cooldown. |
Pinout & Package
LM2591HVS-ADJ/NOPB is supplied in a 5-pin DDPAK/TO-263 (KTT) package with exposed thermal pad, measuring 10.18 mm × 8.41 mm. This thermally enhanced surface-mount package enables direct PCB copper pour connection for efficient heat dissipation in high-power-density designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VIN | Positive input supply | Accepts 4.5–60 V DC; requires local low-ESR bypass capacitor to handle high di/dt switching currents. |
| Output | Switch node | Drives external catch diode and inductor; swings between ~(+VIN − VSAT) and ~−0.5 V during operation. |
| Ground | Power and signal reference | Common return for input/output capacitors, feedback network, and thermal pad; must be low-impedance. |
| Feedback | Voltage sense input | Compares divided output to 1.23-V internal reference; open-circuit or short-circuit here disables regulation. |
| ON/OFF | Enable/disable control | Logic-high (≥2 V) forces shutdown (90 μA IQ); floating or logic-low (≤0.6 V) enables normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 1.2 V to 57 V - supports single-bom flexibility across multiple system voltages without redesigning power stage. |
| Integrated current-limit protection | 1.3–2.8 A peak switch current limit - prevents damage during short-circuit or startup inrush without external sensing. |
| Fixed 150-kHz oscillator | No external timing components required - simplifies layout, improves EMI predictability, and avoids component drift. |
| Low standby current | 90 μA typical shutdown IQ - extends battery life in portable or energy-harvesting systems with intermittent operation. |
| Thermal shutdown with hysteresis | Triggers at 150°C junction, resets ~10–15°C below - prevents thermal cycling and ensures safe recovery after fault clearance. |
Applications
| Industrial 24-V Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24-V vehicle battery or factory bus to 3.3-V/5-V for MCU and CAN transceivers. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated DC rail with input transient tolerance up to 60 V. Use Value: Eliminates need for external pre-regulator; handles cold-crank (6.5 V) and load-dump (60 V) events per ISO 7637-2. |
Use Scenario: Powering door module electronics including window motor drivers, LED indicators, and LIN transceivers. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering 1-A at 5 V from noisy 12-V battery rail. Use Value: 150-kHz switching enables small magnetics; ON/OFF pin allows sleep-mode current reduction to <100 μA. |
| Programmable Test Equipment PSU | Outdoor Telecom Remote Unit |
|
Use Scenario: Lab-grade bench supply with digitally set output voltage (e.g., 12 V, 15 V, 24 V) via DAC-controlled feedback divider. IC Role / Device Role / Timing Role: Adjustable-output DC-DC core enabling software-configurable output without hardware change. Use Value: 1.23-V reference and high-accuracy feedback bias (50 nA typ.) support <1% output programming resolution. |
Use Scenario: Powering remote radio head electronics in uncontrolled outdoor cabinets with wide ambient temperature swing. IC Role / Device Role / Timing Role: Main 48-V-to-5-V conversion stage operating continuously at −40°C to +85°C ambient. Use Value: Guaranteed 1-A output across full temperature range; thermal shutdown prevents field failure in sealed enclosures. |
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 | Higher 3-A output current, 150-kHz frequency, but larger TO-220-5 package and higher quiescent current (5 mA active). | Better suited for higher-load applications; less ideal for space-constrained PCBs due to through-hole footprint. | Select when >1-A load or higher thermal margin is required; verify layout compatibility with TO-220 mounting. |
| TPS54160DGQ | 1.5-A synchronous buck, 100-V input, 2.5-V to 60-V adjustable output, 100-kHz to 2.5-MHz programmable frequency. | Enables smaller inductors and higher efficiency at light loads; requires external MOSFET drivers and compensation. | Choose for ultra-wide VIN (up to 100 V) or where synchronous rectification improves efficiency >85% at partial load. |
Compared with LM2591HVS-ADJ/NOPB, LM2596HV-ADJ offers higher current but sacrifices board area and standby power; TPS54160DGQ provides wider input range and frequency flexibility but increases design complexity and BOM count.
Availability
LM2591HVS-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, and outdoor telecom infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM2591HVS-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, serving industrial, automotive, and communications markets since 1930.
The LM2591HV series was developed as part of TI's SIMPLE SWITCHER® portfolio to deliver robust, easy-to-use DC-DC conversion for harsh-environment applications where reliability, wide input range, and minimal external components are critical.
FAQ
What is the minimum input voltage required for LM2591HVS-ADJ/NOPB to regulate a 5-V output?
The LM2591HVS-ADJ/NOPB requires a minimum input voltage of approximately 6.5 V to sustain 5-V output at full 1-A load, based on its dropout behavior and 1.2-V feedback reference. At lighter loads, regulation can begin near 4.5 V per datasheet recommended operating conditions, but practical design margins require ≥7 V input for reliable 5-V operation across temperature and line variation.
Can LM2591HVS-ADJ/NOPB be used in a negative-output (inverting) configuration?
Yes, LM2591HVS-ADJ/NOPB supports inverting buck-boost topology to generate negative outputs - e.g., −5 V from +12 V - by reconfiguring ground and feedback connections per Figure 25 in the datasheet. The regulator sees |VIN| + |VOUT| across its input-to-ground terminals, so total must remain ≤60 V; for −12 V from +24 V, the device experiences 36 V, staying within rating.
What is the purpose of the feedforward capacitor (CFF) in LM2591HVS-ADJ/NOPB circuits?
The feedforward capacitor (CFF) across the upper feedback resistor improves phase margin and loop stability when output voltage exceeds 10 V or output capacitor ESR is very low (<100 mΩ). It adds lead compensation to counteract the right-half-plane zero inherent in buck converters. CFF values >0.1 μF are discouraged due to risk of negative voltage spikes on the feedback pin during output short-circuit events.
Does LM2591HVS-ADJ/NOPB require an external catch diode, and what type is recommended?
Yes, LM2591HVS-ADJ/NOPB requires an external catch diode connected from Output to Ground. A Schottky diode rated ≥2 A and ≥60 V (e.g., 21DQ06) is strongly recommended for best efficiency and fast recovery, especially at output voltages ≤5 V. Fast-recovery diodes may be used for higher-VIN applications, but ultra-fast types with abrupt turnoff can induce EMI or instability.
How does the ON/OFF pin function in LM2591HVS-ADJ/NOPB, and what are its voltage thresholds?
The ON/OFF pin enables digital control of LM2591HVS-ADJ/NOPB operation: pulling it to ≤0.6 V or leaving it floating activates regulation; driving it to ≥2 V places the device in shutdown with 90 μA typical quiescent current. Threshold voltage is typically 1.3 V, with guaranteed turn-off above 2 V and turn-on below 0.6 V across −40°C to +125°C. Pin voltage must never exceed 25 V.
LM2591HVS-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:
- Tube
- 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)
LM2591HVS-ADJ/NOPB FAQ
1.How can I place an order for LM2591HVS-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2591HVS-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 LM2591HVS-ADJ/NOPB reliable?
The price and inventory of LM2591HVS-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 LM2591HVS-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2591HVS-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2591HVS-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2591HVS-ADJ/NOPB?
LM2591HVS-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2591HVS-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 LM2591HVS-ADJ/NOPB?
For technical support, including LM2591HVS-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2591HVS-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2591HVS-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2591HVS-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 LM2591HVS-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2591HVS-ADJ/NOPB?
All LM2591HVS-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2591HVS-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 LM2591HVS-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2591HVS-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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