My Inquiry
My Account
Texas Instruments LM2594HVN-ADJ
- Part No.:
- LM2594HVN-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2594HVN-ADJ.pdf
- Description:
- IC REG BUCK ADJ 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,053
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2594HVN-ADJ from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter IC designed for 0.5-A load regulation in industrial and embedded power supplies. It operates with a fixed 150-kHz switching frequency, supports input voltages up to 60 V, delivers adjustable output from 1.2 V to 37 V (±4% tolerance), and features TTL-compatible ON/OFF control with 85 μA standby current.
For engineers reviewing the LM2594HVN-ADJ datasheet, LM2594HVN-ADJ pinout, LM2594HVN-ADJ application, or LM2594HVN-ADJ equivalent, key selection criteria include HV input capability (60 V max), feedback reference voltage (1.23 V typ), thermal shutdown protection, SOIC-8 surface-mount package compatibility, and minimal external component count (only four required).
Technical Context
The LM2594HVN-ADJ integrates a PWM controller, power switch, oscillator, and internal compensation into a single chip. Its architecture uses voltage-mode control with a fixed-frequency 150-kHz oscillator and two-stage current limiting-peak current limit (~0.8 A) and frequency-reducing overload protection.
It implements undervoltage lockout via the ON/OFF pin (1.3 V threshold), supports delayed start-up using RC timing on that pin, and enables inverting regulator topologies by bootstrapping the ground pin. Feedback sensing occurs at the internal 1.23-V reference, requiring external resistor divider for output programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 60 V - Supports wide-input industrial rails including 48-V telecom and 24-V factory automation systems. |
| Output Current | 0.5 A continuous - Ensured output drive capability without derating under full line/load/temperature conditions. |
| Switching Frequency | 150 kHz ±15% - Fixed internal oscillator enables predictable EMI filtering and simplifies inductor selection. |
| Feedback Reference | 1.23 V ±0.05 V - Precision reference enables accurate output programming across temperature (−40°C to +125°C). |
| Standby Current | 85 μA - Enables low-power shutdown mode suitable for battery-backed or energy-sensitive applications. |
| Thermal Protection | Internal thermal shutdown - Automatically disables switching if junction temperature exceeds safe operating limit (150°C). |
| Current Limit | 0.8 A peak - Two-stage current limiting prevents damage during short-circuit or overload events. |
Pinout & Package
LM2594HVN-ADJ is housed in an 8-pin SOIC (D-package) with 4.90 mm × 3.91 mm body size and standard 1.27-mm lead pitch. The package supports surface-mount reflow assembly and provides adequate thermal dissipation (RθJA = 150°C/W on 4-layer JEDEC board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | No Connection | Internally unconnected; must be soldered to PCB for mechanical stability and thermal conduction. |
| 4 | Feedback Input | Senses output voltage via external resistor divider; regulates output to maintain 1.23 V at this pin. |
| 5 | ON/OFF Control | TTL-compatible logic input: ≤1.3 V enables operation; ≥1.3 V disables switching and reduces IQ to 85 μA. |
| 6 | Ground | Power and signal reference node; connects to system ground plane for noise immunity and thermal path. |
| 7 | +VIN | Main power input; requires local 68-μF tantalum bypass capacitor to suppress high-frequency switching transients. |
| 8 | Output Switch | Drains internal NPN transistor; connects to catch diode anode and inductor; switches between VIN–VSAT and −0.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 150-kHz oscillator | Eliminates need for external timing components and ensures consistent switching behavior across units and temperatures. |
| Internal frequency compensation | Reduces design complexity by removing external compensation network; enables stable operation with standard inductors. |
| TTL shutdown interface | Allows direct interfacing with microcontroller GPIOs or logic-level control signals without level-shifting circuitry. |
| Thermal shutdown + current limit | Provides dual-fault protection: thermal cutoff prevents overheating; current limiting avoids destructive overloads during startup or fault conditions. |
| SOIC-8 surface-mount package | Enables automated PCB assembly and offers better thermal performance than PDIP while maintaining legacy footprint compatibility. |
Applications
| Industrial Power Supply | Factory Automation Controller |
|---|---|
Use Scenario: Generating 5 V or 12 V from 24-V or 48-V DC bus to power PLC I/O modules and sensors. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC rail with high efficiency and robust fault handling. Use Value: Delivers 0.5-A output with <1.2 V dropout at 60-V input, enabling reliable operation even under brownout or transient overvoltage conditions. | Use Scenario: On-board conversion of 24-V supply to 3.3-V for microcontroller, FPGA, and communication interfaces (RS-485, CAN). IC Role / Device Role / Timing Role: Compact, integrated step-down converter replacing discrete buck controllers and MOSFETs. Use Value: Requires only four external components and supports adjustable output, reducing BOM count and layout area versus modular solutions. |
| Telecom Equipment | Test & Measurement Instrumentation |
Use Scenario: Preregulation stage feeding linear regulators in 48-V powered base station subsystems. IC Role / Device Role / Timing Role: High-efficiency preregulator stepping down 48 V to ~6 V before LDO post-regulation. Use Value: Achieves >80% efficiency at 0.5-A load, minimizing heat generation and improving overall system thermal management. | Use Scenario: Dual-rail power for analog front-ends requiring precise ±5-V or +15-V/-15-V outputs. IC Role / Device Role / Timing Role: Configured as inverting regulator to generate negative output from positive input supply. Use Value: Supports inverting topology with validated design guidance (e.g., Figure 8-5), enabling bipolar supplies without additional ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2594MX-ADJ | Same architecture and specs, but in PDIP-8 package (9.81 mm × 6.35 mm); higher RθJA (95°C/W) and no surface-mount compatibility. | Used where through-hole assembly or prototyping on breadboard/perfboard is preferred. | Select LM2594MX-ADJ only when manual soldering or legacy through-hole infrastructure is required. |
| LMR36506RNXR | Synchronous buck with 3–65 V input, 0.6-A output, 2.1-MHz switching, and integrated FETs; smaller solution size and higher efficiency (>90%). | Targets space-constrained, high-efficiency designs where PCB area and thermal performance are critical. | Choose LMR36506RNXR for new designs needing improved efficiency and reduced external component count; not pin-compatible with LM2594HVN-ADJ. |
Compared with LM2594HVN-ADJ, LM2594MX-ADJ offers identical electrical performance in a through-hole package, while LMR36506RNXR delivers superior efficiency and integration at the cost of non-interchangeable pinout and higher design complexity for EMI filtering.
Availability
LM2594HVN-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, factory automation controllers, and telecom equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2594HVN-ADJ 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 ICs.
The LM2594HVN-ADJ belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use in cost-sensitive, medium-power DC-DC applications where minimal external components and proven reliability are essential.
FAQ
What is the maximum input voltage rating for the LM2594HVN-ADJ?
The LM2594HVN-ADJ has an absolute maximum input voltage rating of 60 V, with recommended operating range from 4.5 V to 60 V. This HV rating distinguishes it from the standard LM2594 (40 V max) and makes it suitable for 48-V industrial and telecom applications. Exceeding 60 V risks permanent damage per Absolute Maximum Ratings in the datasheet.
How does the feedback pin (Pin 4) function in the LM2594HVN-ADJ?
The feedback pin (Pin 4) of the LM2594HVN-ADJ senses the output voltage via an external resistor divider and regulates to maintain 1.23 V at this node. Its bias current is ultra-low (10–50 nA), minimizing divider error. The LM2594HVN-ADJ uses this reference to adjust duty cycle and stabilize output across line, load, and temperature variations.
Can the LM2594HVN-ADJ be used in an inverting regulator configuration?
Yes, the LM2594HVN-ADJ supports inverting topology by bootstrapping its ground pin to the negative output rail. TI provides validated schematics (e.g., Figure 8-5) and design guidance-including component selection and startup current considerations-for generating −5 V or other negative outputs. Diodes D1 and D3 are mandatory for stability and transient protection in this mode.
What is the purpose of the ON/OFF pin (Pin 5) on the LM2594HVN-ADJ?
The ON/OFF pin (Pin 5) provides logic-level enable/disable control for the LM2594HVN-ADJ. Pulling it below 1.3 V (vs. ground) enables regulation; pulling it above 1.3 V disables switching and reduces quiescent current to 85 μA. It accepts up to 25 V, allowing direct connection to higher-voltage control signals without external level shifters.
Does the LM2594HVN-ADJ require external compensation components?
No, the LM2594HVN-ADJ includes internal frequency compensation, eliminating the need for external compensation networks. This simplifies design and ensures stable loop response across all operating conditions when using standard inductors and the recommended input/output capacitors specified in the datasheet.
LM2594HVN-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 500mA
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2594HVN-ADJ FAQ
1.How can I place an order for LM2594HVN-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594HVN-ADJ 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 LM2594HVN-ADJ reliable?
The price and inventory of LM2594HVN-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2594HVN-ADJ is usually 5 days.
3.What payment methods are accepted for LM2594HVN-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594HVN-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594HVN-ADJ?
LM2594HVN-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594HVN-ADJ 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 LM2594HVN-ADJ?
For technical support, including LM2594HVN-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594HVN-ADJ requirements.
6.How does Aetrix verify that LM2594HVN-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2594HVN-ADJ 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 LM2594HVN-ADJ meets industry standards.
7.What is the process for return or replacement of LM2594HVN-ADJ?
All LM2594HVN-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2594HVN-ADJ, 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 LM2594HVN-ADJ part is unused and in its original packaging.
Return procedure for LM2594HVN-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2594HVN-ADJ 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…
