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Texas Instruments LM2597M-12
- Part No.:
- LM2597M-12
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2597M-12.pdf
- Description:
- IC REG BUCK 12V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,575
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Product details
Overview
LM2597M-12 from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC switching regulator delivering 12 V at up to 0.5 A output current, with ±4% output voltage tolerance over line and load, 150-kHz fixed-frequency operation, and input voltage support up to 40 V. It serves as an efficient primary or preregulator in industrial power supplies, embedded systems, and on-card converters.
For engineers reviewing the LM2597M-12 datasheet, LM2597M-12 pinout, LM2597M-12 application, or LM2597M-12 equivalent, key selection criteria include its fixed 12-V output, 8-pin SOIC package, integrated soft-start/shutdown control, error flag with delay, and bias supply (VBS) pin for improved efficiency at high VIN/low VOUT conditions.
Technical Context
The LM2597M-12 integrates a PWM controller, power switch, oscillator, error amplifier, and protection circuitry into a single IC. Its 150-kHz fixed-frequency architecture enables compact external filter design using standard off-the-shelf inductors and capacitors.
It features dual-mode shutdown/soft-start control, an open-collector error flag with programmable delay via external capacitor, and a bias supply (VBS) pin that powers internal circuitry from VOUT instead of VIN-reducing quiescent current and improving efficiency under high-input/low-output conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for downstream logic or analog circuitry without external feedback resistors. |
| Max Output Current | 0.5 A DC - supports moderate-power loads such as microcontrollers, sensors, or interface ICs without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - compatible with 12-V, 24-V, and 36-V industrial bus rails and battery-backed systems. |
| Switching Frequency | 150 kHz (±15%) - balances EMI performance and component size; allows use of low-cost, widely available 100–150 μH inductors. |
| Quiescent Current | 5–10 mA typical operating IQ; 85 μA standby IQ with shutdown - enables low-power hold modes in battery-operated equipment. |
| Efficiency | 88% typical at VIN = 25 V, VOUT = 12 V, IOUT = 0.5 A - reduces thermal load and eliminates need for heatsinks in most PCB layouts. |
| Protection Features | Thermal shutdown, peak current limiting (0.65–1.3 A), and undervoltage lockout - provides robust fault handling without external supervision circuitry. |
Pinout & Package
LM2597M-12 is housed in an 8-pin SOIC (D package) with nominal body size 4.90 mm × 3.91 mm, optimized for surface-mount assembly and thermal dissipation via PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Error Flag | Open-collector output | Asserts low when VOUT drops >5%; 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-good timing. |
| 3 - Bias Supply (VBS) | Power input | Accepts VOUT (≥4 V) to power internal circuitry - reduces VIN current draw and improves efficiency at high VIN/low VOUT. |
| 4 - Feedback | Input (not used in fixed 12-V version) | Internally connected to 12-V divider; left unconnected - no external resistor network required. |
| 5 - Shutdown/Soft-Start | Input | Pull low for shutdown (IQ ≈ 85 μA); add capacitor for soft-start - controls inrush current and output ramp rate. |
| 6 - Ground | Reference node | Main power ground; must be low-impedance connection to minimize noise coupling into sensitive analog blocks. |
| 7 - +VIN | Power input | Primary input supply (4.5–40 V); requires local 100-nF ceramic bypass capacitor to suppress switching transients. |
| 8 - Output | Switch node | Drives external catch diode and inductor; high dv/dt node - keep trace area minimal to reduce EMI radiation. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external feedback resistors and associated layout sensitivity - simplifies design validation and reduces BOM count. |
| Bias supply (VBS) pin | Enables powering internal circuitry from regulated 12-V output - cuts VIN current by ~4 mA and improves efficiency by up to 3% at VIN = 36 V. |
| Integrated soft-start | Reduces peak inrush current from 700 mA to ~160 mA - prevents input rail sag and avoids tripping upstream current limiters. |
| Error flag with delay | Provides clean, debounced power-good signal with user-adjustable hold-off - suitable for direct connection to microcontroller reset inputs. |
| Thermal shutdown & current limit | Self-protects during overload or poor heatsinking - maintains reliability without external foldback or shutdown logic. |
Applications
| Industrial Power Supply | Embedded System Preregulator |
|---|---|
|
Use Scenario: Converting 24-V factory bus to stable 12-V rail for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 12-V supply with built-in fault signaling. Use Value: Delivers 0.5-A continuous current with 88% efficiency at 25-V input, reducing heat generation and enabling convection-only cooling. |
Use Scenario: Generating clean 12-V intermediate rail before LDOs for FPGA core and I/O banks in edge computing gateways. IC Role / Device Role / Timing Role: High-efficiency preregulator minimizing dropout and thermal stress on downstream linear regulators. Use Value: Fixed 12-V output and ±4% tolerance ensure consistent LDO headroom across temperature and load variations. |
| On-Card DC-DC Conversion | Positive-to-Negative Converter |
|
Use Scenario: Local 12-V generation on a motor control board where space constraints prohibit external AC-DC adapters. IC Role / Device Role / Timing Role: Compact, self-contained buck converter using only 4 external components (diode, inductor, two caps). Use Value: 8-pin SOIC footprint and 150-kHz switching allow small PCB area (<1.5 cm² active layout) while maintaining low EMI. |
Use Scenario: Deriving –12-V rail from existing +24-V supply for op-amp biasing in precision analog front-ends. IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2597M-12's internal switch and ground-referenced control pins. Use Value: Enables bipolar supply generation without dedicated inverting ICs - leverages same 12-V fixed-output device in nonstandard topology. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596-12 | Lower max input voltage (40 V vs. LM2597M-12's 40 V), identical 12-V fixed output, but lacks VBS pin and error flag delay. | No integrated power-good delay or bias supply optimization - requires external circuits for reset timing or efficiency tuning. | Choose LM2596-12 only if VBS and delay features are unnecessary and cost is prioritized over design simplicity. |
| LM2577-12 | Higher max input (60 V), but 52-kHz switching frequency and lower efficiency (~75% at 25 V → 12 V); no VBS or error flag. | Requires larger inductors/caps and delivers less output current (0.5 A vs. LM2597M-12's 0.5 A, but with higher losses). | Select LM2577-12 only for legacy designs needing 60-V input compatibility where 150-kHz EMI constraints are relaxed. |
Compared with LM2596-12 and LM2577-12, the LM2597M-12 uniquely combines fixed 12-V output, 150-kHz operation, VBS efficiency enhancement, and programmable error flag delay - making it optimal for new designs requiring robust, low-component-count 12-V conversion with system-level supervision.
Availability
LM2597M-12 is available at Aetrix Electronics and suitable for industrial power supplies, embedded system preregulators, and on-card DC-DC converters requiring stable component supply, long-term lifecycle support, and TI-qualified manufacturing traceability.
Supply support for LM2597M-12 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 expertise in high-reliability power conversion ICs.
The LM2597 series was designed specifically for simple, robust, low-component-count buck regulation in industrial, automotive, and telecom infrastructure - emphasizing ease of use, thermal resilience, and system-level integration features like error flag and soft-start.
FAQ
What is the maximum input voltage rating for the LM2597M-12?
The LM2597M-12 has a maximum input voltage rating of 40 V, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V risks permanent damage per absolute maximum ratings. The HV variant (LM2597HV-12) supports up to 60 V, but LM2597M-12 is not rated for voltages beyond 40 V under any condition.
Does the LM2597M-12 require external feedback resistors to set the 12-V output?
No, the LM2597M-12 is a fixed-output version with internal resistor divider calibrated for 12 V ±4%. Pin 4 (Feedback) is internally connected and must remain unconnected in standard operation - eliminating resistor selection, placement, and tolerance errors common in adjustable regulators.
How does the Bias Supply (VBS) pin improve efficiency in the LM2597M-12?
The VBS pin allows the LM2597M-12's internal circuitry to be powered from the 12-V output instead of the higher input voltage. At VIN = 36 V, this reduces VIN current draw by ~4 mA and improves full-load efficiency by up to 3%, particularly beneficial in high-input/low-output scenarios where quiescent loss dominates.
Can the LM2597M-12 be used in an inverting (positive-to-negative) configuration?
Yes, the LM2597M-12 supports inverting operation by bootstrapping its ground pin to the negative output. The datasheet provides a validated circuit for generating –12 V from +24 V, using the same fixed 12-V device. Output current capability depends on |VIN| + |VOUT| ≤ 40 V, and soft-start is recommended due to high startup currents.
What protection features are integrated into the LM2597M-12?
The LM2597M-12 includes thermal shutdown, peak current limiting (0.65–1.3 A), and undervoltage lockout. These operate autonomously without external components. When triggered, current limiting enters two-stage mode with reduced switching frequency, and thermal shutdown disables the output until junction temperature falls below threshold.
LM2597M-12 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- 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
LM2597M-12 FAQ
1.How can I place an order for LM2597M-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2597M-12 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 LM2597M-12 reliable?
The price and inventory of LM2597M-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2597M-12 is usually 5 days.
3.What payment methods are accepted for LM2597M-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2597M-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2597M-12?
LM2597M-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2597M-12 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 LM2597M-12?
For technical support, including LM2597M-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2597M-12 requirements.
6.How does Aetrix verify that LM2597M-12 is sourced from the original manufacturer or authorized distributors?
All LM2597M-12 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 LM2597M-12 meets industry standards.
7.What is the process for return or replacement of LM2597M-12?
All LM2597M-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2597M-12, 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 LM2597M-12 part is unused and in its original packaging.
Return procedure for LM2597M-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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