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Texas Instruments LM26400YSDX/NOPB
- Part No.:
- LM26400YSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM26400YSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A DL 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,010
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Product details
Overview
LM26400YSDX/NOPB from Texas Instruments is a dual-output, monolithic synchronous buck regulator IC with two integrated 175-mΩ NMOS power switches, 500-kHz fixed-frequency PWM operation, 3 V to 20 V input range, and independent 2-A per channel capability. It delivers regulated outputs down to 0.6 V using peak current-mode control and internal compensation-designed for high-power-density point-of-load conversion in space-constrained industrial and computing systems.
For engineers reviewing the LM26400YSDX/NOPB datasheet, LM26400YSDX/NOPB pinout, LM26400YSDX/NOPB application, or LM26400YSDX/NOPB equivalent, key selection considerations include dual-channel independent enable/soft-start control, frequency foldback under overcurrent, thermal shutdown at 165°C, and compatibility with ceramic output capacitors without external loop compensation.
Technical Context
The LM26400YSDX/NOPB implements peak current-mode control with an internal 0.6-V reference shared across both channels and 180° phase-shifted switching to reduce input ripple. Its architecture integrates bootstrap diodes, programmable soft-start via external capacitors on SS1/SS2, and separate EN1/EN2 logic inputs enabling independent channel sequencing.
It features frequency foldback triggered when FB voltage drops below 0.35 V-reducing switching frequency during overload to limit thermal stress and prevent minimum-on-time violation. Overcurrent protection operates at ~3 A per channel with immediate switch turn-off, while thermal shutdown activates at 165°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports wide-input industrial and automotive supply rails without pre-regulation. |
| Output Current (per channel) | 2 A continuous - sustained with proper PCB thermal design and ceramic output capacitance. |
| Switching Frequency | 500 kHz ±10% - balances inductor size, efficiency, and EMI performance for compact designs. |
| Feedback Reference Voltage | 0.6 V ±1.8% - sets output voltage via external resistor divider; stable over –40°C to 125°C. |
| RDS(ON) (NMOS Switch) | 175 mΩ (HTSSOP), 194 mΩ (WSON) - defines conduction loss and thermal rise at full load. |
| Thermal Shutdown Threshold | 165°C with 15°C hysteresis - protects die integrity during sustained overload or poor heatsinking. |
| Soft-Start Control | External capacitor on SS1/SS2 pins - enables independent ramp timing per channel to manage inrush. |
Pinout & Package
LM26400YSDX/NOPB is packaged in a 16-pin WSON (5.00 mm × 5.00 mm) with exposed thermal pad (DAP) for enhanced heat dissipation. Pin functions are validated per TI SNVS457D Rev D datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVIN | Internal bias supply | Provides gate-drive bootstrap and internal LDO bias; requires local 1-µF ceramic bypass. |
| BST1, BST2 | Bootstrap rails | Drive high-side NMOS gates; each requires dedicated 0.1-µF ceramic capacitor to SWx. |
| EN1, EN2 | Channel enable inputs | Logic-high active (≥2.5 V); independent control allows staggered startup or fault isolation. |
| FB1, FB2 | Feedback inputs | Monitor output voltage via resistor divider; 0.6-V reference enables precise regulation down to 0.6 V. |
| GND | Signal & power ground | Kelvin connection point for feedback divider lower resistor to minimize load regulation error. |
| PVIN | Main power input | Connects directly to drain of internal NMOS; tie pins 11–14 together with low-inductance path. |
| SS1, SS2 | Soft-start timing | Charge current = 16 µA; capacitor value sets ramp time (e.g., 25 nF ≈ 1 ms soft-start). |
| SW1, SW2 | Switch nodes | Connect to inductors and catch diodes; layout critical for EMI and efficiency. |
| DAP | Thermal pad | Must be soldered to solid copper pour for thermal conduction and low-impedance grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diodes | Eliminates need for external bootstrap diodes, reducing BOM count and layout complexity. |
| Frequency foldback protection | Reduces switching frequency under overload to maintain stability and limit thermal stress when VFB < 0.35 V. |
| Independent enable & soft-start | EN1/EN2 and SS1/SS2 allow channel-specific sequencing, inrush control, and fault containment. |
| Internal loop compensation | Enables stable operation with ceramic output capacitors-no external compensation components required. |
| 180° phase-shifted outputs | Reduces input ripple current by ~70% compared to in-phase operation, easing input capacitor sizing. |
| Overcurrent & thermal protection | Per-channel 3-A peak current limit and 165°C thermal shutdown with hysteresis ensure robust fault recovery. |
Applications
| DTV-LCD Power Supply | Industrial Point-of-Load |
|---|---|
|
Use Scenario: Dual-rail power for LCD panel logic (1.2 V) and backlight driver (2.5 V) in digital TV systems. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering tightly regulated, sequenced outputs from 12-V main rail. Use Value: Independent soft-start prevents display flicker during power-up; 180° phase shift minimizes input capacitor stress. |
Use Scenario: Distributed 2-A supplies for FPGA I/O banks and core logic in programmable logic controllers. IC Role / Device Role / Timing Role: Compact, thermally efficient dual buck regulator replacing discrete solutions on dense industrial PCBs. Use Value: Internal compensation and ceramic-capacitor compatibility simplify layout; thermal shutdown ensures reliability in sealed enclosures. |
| Automotive Infotainment | Computing Peripherals |
|
Use Scenario: Powering SoC subsystems (e.g., audio DSP + video decoder) in 12-V automotive head units. IC Role / Device Role / Timing Role: Wide-input buck regulator handling cold-crank (3 V) to load-dump (20 V) transients. Use Value: 3–20 V input range eliminates need for pre-regulator; frequency foldback maintains stability during short-circuit events. |
Use Scenario: Dual 2-A supplies for USB-C PD controller and Type-C port power delivery circuitry. IC Role / Device Role / Timing Role: High-efficiency, low-noise dual regulator supporting fast transient response for dynamic load profiles. Use Value: Peak current-mode control enables <40 ns minimum on-time for low-VOUT operation; CFF capacitor support improves load-step response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54290RGER | Higher 2.2-MHz switching frequency; 3.5-A per channel; requires external compensation. | Better suited for ultra-compact designs where smaller inductors are prioritized over thermal margin. | Choose TPS54290RGER when board area is constrained and higher switching losses are acceptable. |
| LM26420QSDX/NOPB | Automotive-grade (AEC-Q100); identical topology and pinout; wider temp range (–40°C to 150°C). | Required for safety-critical automotive modules where extended junction temperature and qualification are mandatory. | Choose LM26420QSDX/NOPB when automotive qualification and 150°C max junction temperature are required. |
Compared with TPS54290RGER and LM26420QSDX/NOPB, LM26400YSDX/NOPB offers optimal balance of integration (internal compensation, bootstrap diodes), thermal performance (27.8°C/W RθJA in WSON), and cost for industrial and consumer applications-not requiring AEC-Q100 or ultra-high-frequency operation.
Availability
LM26400YSDX/NOPB is available at Aetrix Electronics and suitable for DTV-LCD, industrial controls, and computing peripherals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM26400YSDX/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 expertise in high-reliability DC-DC conversion.
The LM264xx family was designed specifically for high-density, dual-output point-of-load regulation in space-constrained industrial, computing, and consumer electronics-emphasizing ease of use, thermal robustness, and minimal external component count.
FAQ
What is the maximum output current per channel for LM26400YSDX/NOPB?
The LM26400YSDX/NOPB supports up to 2 A continuous output current per channel under recommended operating conditions (TJ ≤ 125°C). Actual achievable current depends on PCB thermal design, ambient temperature, and input/output voltage differential. In the WSON package with proper copper pour, 2 A per channel is sustainable at 20 VIN/1.2 VOUT with 40°C ambient.
Does LM26400YSDX/NOPB require external compensation components?
No, LM26400YSDX/NOPB features fully internal loop compensation optimized for ceramic output capacitors. No external compensation network is needed-simplifying design and reducing bill-of-materials. The internal transconductance amplifier and compensation network are factory-trimmed to ensure stability across the full operating range.
Can LM26400YSDX/NOPB operate with a 3-V input supply?
Yes, LM26400YSDX/NOPB is specified for 3 V to 20 V input operation. At 3 V input, it can regulate down to 0.6 V output with ≥90% efficiency at light loads. Minimum on-time of 40 ns enables stable operation even at low duty cycles-critical for low-VOUT applications like FPGA core rails.
How does frequency foldback work in LM26400YSDX/NOPB?
In LM26400YSDX/NOPB, frequency foldback activates when FB voltage falls below 0.35 V-typically during overload or short-circuit. The switching frequency reduces progressively (down to ~390 kHz) to limit peak switch current and thermal stress. This mechanism prevents runaway current due to minimum on-time constraints and aids safe recovery after fault clearance.
What package options are available for LM26400YSDX/NOPB?
LM26400YSDX/NOPB is offered exclusively in the 16-pin WSON package (5.00 mm × 5.00 mm) with exposed thermal pad (DAP). This thermally enhanced package achieves 27.8°C/W junction-to-ambient thermal resistance-superior to the HTSSOP variant-and is optimized for high-power-density layouts in industrial and consumer applications.
LM26400YSDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 2A
- Frequency - Switching:
- 520kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WSON (5x5)
LM26400YSDX/NOPB FAQ
1.How can I place an order for LM26400YSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26400YSDX/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 LM26400YSDX/NOPB reliable?
The price and inventory of LM26400YSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26400YSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM26400YSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26400YSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26400YSDX/NOPB?
LM26400YSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26400YSDX/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 LM26400YSDX/NOPB?
For technical support, including LM26400YSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26400YSDX/NOPB requirements.
6.How does Aetrix verify that LM26400YSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26400YSDX/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 LM26400YSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM26400YSDX/NOPB?
All LM26400YSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26400YSDX/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 LM26400YSDX/NOPB part is unused and in its original packaging.
Return procedure for LM26400YSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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