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Texas Instruments LM26400YMHX/NOPB
- Part No.:
- LM26400YMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM26400YMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A DL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,632
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Product details
Overview
LM26400YMHX/NOPB from Texas Instruments is a dual-output, monolithic PWM buck regulator IC with two integrated 175-mΩ NMOS power switches, delivering up to 2 A per channel across a 3 V to 20 V input range. It operates at a fixed 500-kHz switching frequency, supports output voltages down to 0.6 V via external feedback dividers, and features independent enable and soft-start pins for sequencing in point-of-load applications such as set-top boxes and industrial controls.
For engineers reviewing the LM26400YMHX/NOPB datasheet, LM26400YMHX/NOPB pinout, LM26400YMHX/NOPB application, or LM26400YMHX/NOPB equivalent, key selection considerations include its peak-current-mode control architecture, internal compensation, 40-ns minimum on-time capability, frequency foldback protection, and thermal shutdown at 165°C - all critical for stable dual-rail DC-DC conversion in space-constrained, thermally demanding systems.
Technical Context
The LM26400YMHX/NOPB implements peak-current-mode control with built-in loop compensation, enabling stable regulation without external compensation components. Its dual channels share a common 0.6-V reference but operate with 180° phase-shifted PWM clocks to reduce input ripple and thermal stress.
Each channel integrates bootstrap diodes and supports independent soft-start timing via external capacitors on SS1/SS2 pins. Frequency foldback activates when FB voltage drops below 0.35 V, reducing switching frequency under overcurrent or short-circuit conditions to limit thermal runaway and improve reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports wide-range industrial and automotive supplies without pre-regulation. |
| Output Current (per channel) | 2 A continuous - enables compact dual-rail POL designs for FPGAs, DSPs, and ASICs. |
| Switching Frequency | 500 kHz ±10% - balances inductor size, efficiency, and EMI filtering requirements. |
| Feedback Reference Voltage | 0.6 V ±1.8% - sets precise output voltage via external resistor divider; low tolerance minimizes output error. |
| Internal MOSFET RDS(ON) | 175 mΩ (HTSSOP) - reduces conduction loss and thermal load at full 2-A output. |
| Minimum On-Time | 40 ns - enables high step-down ratios (e.g., 12 V → 1.2 V) at 500 kHz without pulse-skipping. |
| Thermal Shutdown Threshold | 165°C - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LM26400YMHX/NOPB is packaged in a thermally enhanced 16-pin HTSSOP (4.4 mm × 5.0 mm) with PowerPAD, optimized for high-power-density layouts and efficient heat dissipation through the exposed die attach pad (DAP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVIN | Internal bias supply rail | Provides regulated internal voltage for gate drivers and logic; requires local 0.1-µF bypass capacitor. |
| BST1 / BST2 | Bootstrap supply for CH1/CH2 gate drive | Must connect external 0.1-µF ceramic capacitor between BSTx and SWx to sustain high-side NMOS turn-on. |
| EN1 / EN2 | Independent channel enable inputs | Logic-high (>2.5 V) enables respective channel; allows flexible power sequencing and fault isolation. |
| FB1 / FB2 | Feedback inputs for CH1/CH2 | Connect to resistor divider to set output voltage; 0.6-V reference enables 1.2-V, 2.5-V, 3.3-V, or 5-V rails. |
| GND | Signal and power ground | Kelvin connection point for lower feedback resistor; must be tied to DAP for optimal load regulation and thermal performance. |
| PVIN | Main power input (pins 11–14) | High-current path to internal NMOS drains; requires low-ESR bulk capacitance and short PCB traces. |
| SS1 / SS2 | Soft-start timing inputs | Capacitor-to-ground sets ramp rate; 16-µA internal current source enables predictable startup with <1-ms to >10-ms duration. |
| SW1 / SW2 | Switch node outputs | Connect to inductor, catch diode (if used), and BSTx capacitor; high dv/dt nodes requiring careful layout. |
| DAP | Exposed thermal pad | Mandatory solder connection to PCB ground plane for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diodes | Eliminates need for external bootstrap diodes, reducing BOM count and layout area in dual-buck designs. |
| Frequency foldback protection | Automatically lowers switching frequency during overcurrent events to prevent thermal runaway and reduce stress on external components. |
| 180° phase-shifted PWM outputs | Halves input ripple current compared to in-phase operation, allowing smaller input capacitors and reduced EMI. |
| Internal loop compensation | Enables stable operation with ceramic output capacitors only - no external compensation network required. |
| Separate soft-start and enable pins | Supports independent power-up sequencing of dual rails, critical for FPGA I/O and core voltage coordination. |
Applications
| DTV-LCD Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Dual-rail power for LCD panel logic (3.3 V) and backlight driver (12 V) in digital TV systems. IC Role / Device Role / Timing Role: Primary DC-DC converter providing isolated, sequenced 3.3-V and adjustable 12-V outputs from a 12-V or 19-V adapter. Use Value: 180° phase shift cuts input capacitor RMS current by ~30%, extending capacitor life and reducing board area. | Use Scenario: Local regulation for analog sensor interfaces (5 V) and microcontroller cores (1.2 V) in programmable logic controllers. IC Role / Device Role / Timing Role: Point-of-load regulator delivering tightly regulated, low-noise dual supplies with independent enable control for system-level power gating. Use Value: Internal 0.6-V reference and ±1.8% tolerance ensure <±2% output accuracy across –40°C to 125°C, meeting industrial temp-grade requirements. |
| Automotive Infotainment Head Units | Computing Peripherals (USB Hubs, Docking Stations) |
Use Scenario: Powering SoC cores (1.1 V) and DDR memory (1.35 V) in head unit mainboards operating from 9–16 V battery supply. IC Role / Device Role / Timing Role: High-efficiency dual buck regulator handling wide-input transients while maintaining tight output regulation during cold-crank (6.5 V) and load-dump (28 V) events. Use Value: 3–20 V input range and 40-ns minimum on-time support direct battery connection without pre-regulator, simplifying power architecture. | Use Scenario: Generating 5-V USB bus power and 3.3-V controller logic from a 12-V wall adapter in multi-port USB hubs. IC Role / Device Role / Timing Role: Dual-channel synchronous buck converter enabling independent enable/disable of USB ports and logic domain for dynamic power management. Use Value: Separate EN1/EN2 pins allow software-controlled port disable with zero quiescent current (2 nA shutdown), meeting USB suspend mode requirements. |
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 |
|---|---|---|---|
| TPS54290PWPR | Higher 2.2-MHz switching frequency; 3-A per channel; requires external compensation. | Better suited for ultra-compact designs where inductor size is critical; less tolerant of high-ESR output caps. | Select when board space is constrained and higher-frequency operation justifies added design complexity. |
| LM26420QMHX/NOPB | Automotive-grade (AEC-Q100); identical pinout and electrical specs; qualified for –40°C to 125°C junction. | Required for automotive infotainment, ADAS, or body electronics where qualification and extended temperature compliance are mandatory. | Choose for automotive production programs needing certified reliability and long-term supply assurance. |
Compared with TPS54290PWPR and LM26420QMHX/NOPB, the LM26400YMHX/NOPB offers optimal balance of ease-of-use (internal compensation), thermal robustness (165°C shutdown), and industrial temperature support (–40°C to 125°C), making it ideal for cost-sensitive, non-automotive embedded systems requiring proven dual-rail stability.
Availability
LM26400YMHX/NOPB is available at Aetrix Electronics and suitable for DTV-LCD, industrial PLCs, and computing peripherals requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for LM26400YMHX/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 solutions.
The LM26400YMHX/NOPB belongs to TI's wide-input-voltage buck regulator product line, engineered for industrial, computing, and consumer applications demanding dual-rail efficiency, thermal resilience, and minimal external component count.
FAQ
What is the recommended input capacitor configuration for LM26400YMHX/NOPB?
The LM26400YMHX/NOPB requires a low-ESR bulk capacitor (e.g., 10–47 µF tantalum or polymer) plus a 0.1-µF ceramic capacitor placed directly at the PVIN pins. This combination suppresses high-frequency switching noise and maintains stable input voltage during transient load steps. TI's typical design uses a 10-µF/16-V X5R ceramic (GRM32DR61C106KA01) for optimal performance across temperature and bias conditions.
Does LM26400YMHX/NOPB support pre-biased output startup?
Yes, the LM26400YMHX/NOPB can start up into a pre-biased output if the input-to-output voltage difference exceeds 2 V. This behavior is validated in the datasheet's Device Functional Modes section. Successful pre-bias startup depends on sufficient initial charge on the bootstrap capacitor; designers should verify operation under worst-case prebias (e.g., 12-V output with 12-V input) using bench testing.
How does frequency foldback operate in LM26400YMHX/NOPB during overload?
In LM26400YMHX/NOPB, frequency foldback activates when the FB pin voltage falls below 0.35 V - typically during overcurrent or short-circuit events. The switching frequency decreases linearly as FB drops further, reducing power dissipation and thermal stress. This mechanism is confirmed in Figure 10 of the SNVS457D datasheet and applies independently per channel without affecting the other regulator.
What is the thermal resistance (RθJA) of LM26400YMHX/NOPB in its HTSSOP package?
The LM26400YMHX/NOPB in the PWP (HTSSOP-16) package has a junction-to-ambient thermal resistance (RθJA) of 39.4°C/W when mounted on a standard 4-layer JEDEC test board (4.5″ × 3″, 2 oz copper). This value assumes proper soldering of the DAP thermal pad to a large ground plane; actual board-level RθJA will vary based on PCB copper area and airflow.
Can LM26400YMHX/NOPB be used with all-ceramic output capacitors?
Yes, the LM26400YMHX/NOPB is specifically optimized for all-ceramic output capacitor designs. Its internal compensation and peak-current-mode control provide stable operation with X5R or X7R MLCCs - no electrolytic or tantalum capacitors are required. TI recommends ≥10 µF total ceramic capacitance per channel, placed close to the SW and GND pins for best transient response.
LM26400YMHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-HTSSOP
LM26400YMHX/NOPB FAQ
1.How can I place an order for LM26400YMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26400YMHX/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 LM26400YMHX/NOPB reliable?
The price and inventory of LM26400YMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26400YMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM26400YMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26400YMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26400YMHX/NOPB?
LM26400YMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26400YMHX/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 LM26400YMHX/NOPB?
For technical support, including LM26400YMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26400YMHX/NOPB requirements.
6.How does Aetrix verify that LM26400YMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26400YMHX/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 LM26400YMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM26400YMHX/NOPB?
All LM26400YMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26400YMHX/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 LM26400YMHX/NOPB part is unused and in its original packaging.
Return procedure for LM26400YMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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