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Texas Instruments LM2597HVM-ADJ
- Part No.:
- LM2597HVM-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2597HVM-ADJ.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,716
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Product details
Overview
LM2597HVM-ADJ 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 0.5-A output current with ±4% output voltage accuracy, operates from 4.5 V to 60 V input, features a fixed 150-kHz switching frequency, and supports adjustable output from 1.2 V to 37 V - enabling flexible regulation in preregulator, on-card, or positive-to-negative converter applications.
For engineers reviewing the LM2597HVM-ADJ datasheet, LM2597HVM-ADJ pinout, LM2597HVM-ADJ application, or LM2597HVM-ADJ equivalent, key selection criteria include its HV-rated input range (60 V), bias supply (VBS) pin for efficiency optimization at high VIN/low VOUT, integrated shutdown/soft-start, error flag with delay timing, and thermal/current protection - all in an 8-pin SOIC package.
Technical Context
The LM2597HVM-ADJ implements a current-mode control architecture with internal frequency compensation and a fixed 150-kHz oscillator. Its nonsynchronous buck topology uses an internal NPN switch with 1.1-V typical saturation voltage at 0.5-A load, requiring an external catch diode and inductor.
It integrates supervisory functions including undervoltage lockout via shutdown pin (1.3-V threshold), open-collector error flag triggered at 95% of nominal VOUT with programmable delay, and bias supply (VBS) pin that powers internal circuitry from VOUT - reducing VIN current draw and improving efficiency by up to 5% under high-input/low-output conditions.
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 systems without external pre-regulation. |
| Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, and analog circuitry in embedded systems. |
| Output Voltage Range | 1.2 V to 37 V (adjustable) - set via external resistor divider on FB pin; enables single-part flexibility across multiple rail requirements. |
| Switching Frequency | 150 kHz (±15%) - enables use of low-cost, standard-value inductors (e.g., 68–100 µH) and reduces EMI compared to higher-frequency alternatives. |
| Feedback Reference Voltage | 1.23 V (±2.4%) - defines regulation point; low tolerance ensures tight output accuracy over line/load/temperature. |
| Standby Quiescent Current | 140 µA typical (LM2597HV) - enables ultra-low-power shutdown mode suitable for battery-backed or always-on systems. |
| Thermal Resistance θJA | 95 °C/W (SOIC-8) - allows full 0.5-A operation at +85°C ambient with minimal PCB copper area; no heatsink required. |
Pinout & Package
LM2597HVM-ADJ is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, optimized for surface-mount assembly and thermal performance on standard FR-4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Error Flag | Open-collector output | Asserts low when VOUT drops below 95% of target; used for MCU reset or system fault signaling; requires pull-up resistor. |
| 2 - Delay | Capacitor node | Sets time delay between VOUT reaching 95% and Error Flag going high; enables controlled power-up sequencing. |
| 3 - Bias Supply (VBS) | Power input | Accepts regulated VOUT (≥3.5 V) to power internal circuitry - reduces VIN current and improves efficiency at high VIN/low VOUT. |
| 4 - Feedback (FB) | High-impedance input | Senses divided output voltage; 10–50 nA bias current enables high-resistor-divider designs minimizing quiescent loss. |
| 5 - Shutdown/Soft-Start | Dual-function input | Pulled low (<0.6 V) disables regulator (ISTBY = 140 µA); capacitor adds soft-start ramp to limit inrush current. |
| 6 - Ground | Reference node | Common return for internal circuitry and external components; must be low-inductance connection to minimize noise. |
| 7 - +VIN | Main power input | Accepts 4.5–60 V DC; requires local 100-nF ceramic bypass capacitor to suppress switching transients. |
| 8 - Output | Switch collector | Drives external inductor/diode; swings between (VIN − VSAT) and ~−0.5 V; demands minimal PCB trace area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Bias Supply (VBS) Pin | Enables internal circuitry to run from VOUT instead of VIN - cuts operating IQ by >80% and boosts efficiency up to 5% at VIN = 48 V / VOUT = 5 V. |
| Integrated Soft-Start | Capacitor-programmable output voltage ramp - limits peak inrush current to ≤160 mA (vs. 700 mA without), protecting input sources and downstream caps. |
| Error Flag with Delay | Open-drain flag with user-set delay - provides clean power-good signal for microprocessor reset after stable regulation is achieved. |
| Thermal & Current Protection | Two-stage current limit (0.58–1.4 A) plus thermal shutdown at 150°C - prevents damage during overload, short-circuit, or poor heatsinking. |
| Fixed-Frequency Operation | 150-kHz internal oscillator - simplifies EMI filtering design and avoids variable-frequency jitter issues common in hysteretic regulators. |
Applications
| Industrial Power Supply Preregulator | Automotive On-Board DC-DC Converter |
|---|---|
|
Use Scenario: Converting 24 V or 48 V vehicle battery or factory bus to 5 V or 12 V intermediate rail before linear regulation. IC Role / Device Role / Timing Role: Primary buck regulator providing efficient, stable intermediate voltage with built-in fault signaling. Use Value: Eliminates need for discrete high-voltage MOSFET drivers; 60 V max VIN withstands load-dump transients per ISO 7637-2. |
Use Scenario: Generating 3.3 V or 5 V for infotainment ECUs, ADAS sensors, or CAN transceivers from 12 V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Step-down controller delivering regulated output despite input dips to 4.5 V during cranking. Use Value: 4.5 V minimum VIN and 140 µA standby current support always-on functionality without excessive battery drain. |
| Positive-to-Negative Inverting Supply | Programmable Lab/Tester Power Module |
|
Use Scenario: Generating –5 V or –12 V from +12 V or +24 V input for op-amp biasing or analog signal conditioning. IC Role / Device Role / Timing Role: Inverting buck-boost topology using grounded feedback and bootstrapped ground reference. Use Value: Single-chip solution avoids dual-output controllers; 100 µH inductor recommendation simplifies BOM and layout. |
Use Scenario: Bench power supply module where output voltage must be precisely adjusted across 1.2–37 V range for prototype validation. IC Role / Device Role / Timing Role: Adjustable buck regulator with fine-resolution VOUT control via precision resistor divider. Use Value: ±4% output accuracy and 1.23 V reference enable <1% total error with 0.1% resistors - suitable for calibration-grade outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596-ADJ | Lower max VIN (40 V vs. 60 V); same 0.5-A rating, 150-kHz freq, and SOIC-8 package. | Lacks bias supply (VBS) pin and error flag delay; less suited for high-VIN efficiency optimization or sequenced power-up. | Select when input stays ≤40 V and VBS/error flag features are unnecessary - lower cost, mature second-source availability. |
| LM2678-ADJ | Higher output current (5 A), 260-kHz switching, but larger SOIC-8 footprint and no VBS pin. | Designed for high-current loads; lacks integrated error flag and soft-start delay; requires more complex compensation. | Choose only when ≥3 A output is needed; not drop-in - demands new inductor, diode, and layout due to higher peak currents. |
Compared with LM2596-ADJ, LM2597HVM-ADJ offers superior high-input-voltage robustness and efficiency tuning via VBS; versus LM2678-ADJ, it trades raw current capability for tighter integration, simpler design, and better suitability for space-constrained 0.5-A applications.
Availability
LM2597HVM-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, and test equipment requiring stable component supply, long-lifecycle support, and proven reliability in harsh environments.
Supply support for LM2597HVM-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 ICs, with decades of expertise in switching regulator design and automotive-grade qualification.
The LM2597HV product line was engineered for high-input-voltage DC-DC conversion in industrial, transportation, and telecom infrastructure - prioritizing ruggedness, simplicity, and compatibility with standard passive components.
FAQ
What is the maximum input voltage supported by the LM2597HVM-ADJ?
The LM2597HVM-ADJ supports a maximum input voltage of 60 V, as specified in its absolute maximum ratings and recommended operating conditions. This HV rating distinguishes it from the standard LM2597 (40 V max) and enables use in 48 V systems, industrial buses, and automotive load-dump scenarios where transient spikes exceed 40 V. The device maintains regulation down to 4.5 V, covering cold-crank conditions.
How does the Bias Supply (VBS) pin improve efficiency in the LM2597HVM-ADJ?
The VBS pin on the LM2597HVM-ADJ allows internal circuitry to be powered from the regulated output instead of VIN. When VOUT is ≥3.5 V, connecting VBS to VOUT reduces VIN current draw by >80%, lowering conduction losses - especially beneficial at high VIN/low VOUT (e.g., 48 V → 5 V), where efficiency gains reach up to 5% as shown in TI's Figure 19 and Figure 20.
Can the LM2597HVM-ADJ be used in an inverting (positive-to-negative) configuration?
Yes, the LM2597HVM-ADJ supports inverting operation by bootstrapping its ground pin to the negative output and grounding the feedback pin. TI Application Note SNVS119D Figure 24 shows a working –5 V design using the LM2597-5; the adjustable version extends this to any negative output. Key constraints include limiting |VIN| + |VOUT| ≤ 60 V and using a 100-µH inductor for stability.
What protection features are integrated into the LM2597HVM-ADJ?
The LM2597HVM-ADJ includes thermal shutdown (150°C junction limit), two-stage current limiting (0.58–1.4 A peak), and undervoltage lockout via the shutdown pin. It also features an open-collector error flag that asserts low if VOUT falls >5% below target, with a capacitor-programmable delay to avoid false triggers during startup - providing comprehensive fault coverage without external circuitry.
Is the LM2597HVM-ADJ pin-compatible with other LM2597 variants?
Yes, the LM2597HVM-ADJ shares identical 8-pin SOIC (D) and PDIP (P) packages and pinout with all LM2597 and LM2597HV fixed- and adjustable-output versions. Pin functions - including Error Flag, Delay, VBS, FB, SD/SS, GND, VIN, and OUTPUT - are fully consistent across the family, enabling direct substitution where input voltage and output requirements align.
LM2597HVM-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2597HVM-ADJ FAQ
1.How can I place an order for LM2597HVM-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597HVM-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 LM2597HVM-ADJ reliable?
The price and inventory of LM2597HVM-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2597HVM-ADJ is usually 5 days.
3.What payment methods are accepted for LM2597HVM-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597HVM-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597HVM-ADJ?
LM2597HVM-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597HVM-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 LM2597HVM-ADJ?
For technical support, including LM2597HVM-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597HVM-ADJ requirements.
6.How does Aetrix verify that LM2597HVM-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2597HVM-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 LM2597HVM-ADJ meets industry standards.
7.What is the process for return or replacement of LM2597HVM-ADJ?
All LM2597HVM-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2597HVM-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 LM2597HVM-ADJ part is unused and in its original packaging.
Return procedure for LM2597HVM-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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