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Texas Instruments LM26400YSDE/NOPB
- Part No.:
- LM26400YSDE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM26400YSDE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A DL 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:205
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Product details
Overview
LM26400YSDE/NOPB from Texas Instruments is a dual-output, monolithic PWM buck regulator with two integrated 175-mΩ NMOS switches, delivering up to 2 A per channel across an input range of 3 V to 20 V and supporting output voltages as low as 0.6 V. It operates at a fixed 500-kHz switching frequency, features internal compensation, separate enable and soft-start pins, and is packaged in a thermally enhanced 16-pin HTSSOP (PWP) with PowerPAD.
For engineers reviewing the LM26400YSDE/NOPB datasheet, LM26400YSDE/NOPB pinout, LM26400YSDE/NOPB application, or LM26400YSDE/NOPB equivalent, key selection considerations include dual-channel independent control, 40-ns minimum on-time for high VIN-to-VOUT ratios, frequency foldback under overcurrent, thermal shutdown at 165°C, and compatibility with ceramic output capacitors without external loop compensation.
Technical Context
The LM26400YSDE/NOPB implements peak-current-mode control with a shared 0.6-V reference and 180° out-of-phase switching between channels to reduce input ripple. Its internal 175-mΩ NMOS FETs, integrated bootstrap diodes, and frequency foldback protection enable stable operation under line/load transients and short-circuit conditions without external components.
It uses a single internal oscillator set to 500 kHz, supports prebiased start-up with ≥2-V VIN–VOUT margin, and employs a transconductance error amplifier with built-in compensation optimized for ceramic output capacitors - eliminating need for external type-II or type-III networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 20 V - supports wide industrial, automotive, and computing supply rails without external pre-regulation. |
| Output Current per Channel | 2 A continuous - sustained by internal 175-mΩ NMOS FETs and thermal design with RθJA = 39.4°C/W (HTSSOP). |
| Switching Frequency | 500 kHz ±10% - balances inductor size, efficiency, and EMI performance; fixed internally, no external resistor required. |
| Feedback Reference Voltage | 0.6 V ±1.8% (–40°C to 125°C) - sets output via external resistor divider; enables precise low-voltage regulation down to 0.6 V. |
| Minimum On-Time | 40 ns - allows high step-down ratios (e.g., 12 V → 1.2 V) at 500 kHz without pulse-skipping or instability. |
| Thermal Shutdown Threshold | 165°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design; automatic recovery after cooldown. |
| Frequency Foldback Trigger | FB voltage ≤ 0.35 V - reduces switching frequency during overcurrent to limit thermal stress and prevent runaway duty cycle. |
Pinout & Package
LM26400YSDE/NOPB is housed in a 16-pin HTSSOP (PWP) package with exposed PowerPAD for enhanced thermal dissipation (4.40 mm × 5.00 mm body). The package includes four PVIN pins (11–14) tied together for low-inductance high-current input connection and a dedicated die-attach pad (DAP) that must be soldered to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1, FB2 | Feedback inputs | Connect to resistor dividers to set each channel's output voltage; referenced to 0.6 V internal bandgap. |
| EN1, EN2 | Digital enable inputs | Logic-high (>2.5 V) enables respective channel; independent control allows staggered power-up or fault isolation. |
| SS1, SS2 | Soft-start timing inputs | Capacitor-to-ground sets ramp rate; internal 16-µA current source charges pin until FB reaches 0.6 V. |
| BST1, BST2 | Bootstrap supplies | Drive gate of internal NMOS; require 0.1-µF ceramic capacitor between BSTx and SWx for high-side switching. |
| SW1, SW2 | Switch nodes | Connect to inductors and catch diodes; high dv/dt nodes requiring tight layout and Kelvin grounding. |
| PVIN (11–14) | Main power input | Direct connection to drain of internal NMOS; tie all four pins to minimize IR drop and thermal resistance. |
| AVIN | Analog bias supply | Provides internal LDO bias; requires local 0.1-µF bypass capacitor; draws only 2 nA in shutdown. |
| GND | Signal & power ground | Kelvin connection point for feedback divider lower resistor; ties to DAP for lowest impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 2-A buck regulators | Enables split-rail or multi-voltage system power with channel-specific enable/soft-start - no external controllers needed. |
| Internal 175-mΩ NMOS switches | Eliminates external MOSFETs and drivers; achieves >90% efficiency at 12 V → 3.3 V/2 A with ceramic output caps. |
| 180° phase-shifted switching | Reduces input capacitor RMS current by ~30% versus in-phase operation - lowers input cap count and size. |
| Frequency foldback protection | Prevents thermal runaway during overload by lowering fSW when FB drops below 0.35 V - avoids destructive duty-cycle extension. |
| Integrated bootstrap diodes | Removes need for external bootstrap diodes; simplifies layout and improves reliability in high-duty-cycle applications. |
| 40-ns minimum on-time | Supports 12 V → 1.2 V conversion at 500 kHz without pulse-skipping - maintains regulation and low output ripple. |
Applications
| Point-of-Load Regulation | Industrial Control Systems |
|---|---|
Use Scenario: Providing isolated 1.2 V and 2.5 V rails to FPGA I/O banks and core logic in programmable logic controllers. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering tightly regulated, low-noise DC power with independent sequencing. Use Value: Eliminates need for two discrete regulators; 180° phase shift cuts input capacitance requirements by 30%, saving board space and cost. | Use Scenario: Powering microcontroller, display driver, and sensor interface circuits in factory automation HMIs operating from 12–24 V DC bus. IC Role / Device Role / Timing Role: Primary DC-DC converter generating multiple stable rails from unregulated industrial supply with robust thermal management. Use Value: Thermal shutdown at 165°C and frequency foldback ensure reliable operation in enclosed enclosures without forced air cooling. |
| Automotive Infotainment | Computing Peripherals |
Use Scenario: Supplying 3.3 V and 5 V to USB hub controller and audio codec in rear-seat entertainment systems powered from 9–16 V battery rail. IC Role / Device Role / Timing Role: Wide-input buck regulator meeting automotive cold-crank (6 V) and load-dump (20 V) transient requirements. Use Value: 3 V–20 V input range and 40-ns min on-time maintain regulation during cranking; separate EN pins allow controlled power-up sequence. | Use Scenario: Generating 1.8 V and 3.3 V for SSD controller and interface logic in external storage enclosures using 12 V adapter input. IC Role / Device Role / Timing Role: High-density dual-output regulator enabling compact, fanless peripheral designs with minimal BOM. Use Value: Internal compensation and ceramic-cap-optimized loop eliminate tuning effort; HTSSOP PowerPAD ensures thermal compliance at full 2-A load. |
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 |
|---|---|---|---|
| LM26420YMH/NOPB | Same architecture and pinout; WSON-16 package (5.0 mm × 5.0 mm), lower RθJA (27.8°C/W) but no PowerPAD thermal slug. | Better thermal performance in space-constrained layouts; less effective heat spreading than HTSSOP PowerPAD in high-ambient environments. | Select LM26420YMH/NOPB when board area is limited and airflow is available; LM26400YSDE/NOPB preferred for conduction-cooled or sealed enclosures. |
| TPS54290PWPR | 2.5-A dual buck with adjustable frequency (300–2000 kHz), external compensation, and higher RDS(ON) (210 mΩ). | Requires external loop compensation and more external components; supports higher current but lower efficiency at light loads. | Choose TPS54290PWPR when frequency flexibility or >2-A output is required; LM26400YSDE/NOPB offers simpler design with guaranteed stability. |
Compared with LM26420YMH/NOPB, LM26400YSDE/NOPB provides superior thermal conduction via PowerPAD and lower EMI due to fixed 500-kHz operation; versus TPS54290PWPR, it delivers faster time-to-market with zero-compensation design but less configurability for specialized noise or efficiency targets.
Availability
LM26400YSDE/NOPB is available at Aetrix Electronics and suitable for industrial controls, automotive infotainment, and computing peripherals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM26400YSDE/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM264xx family was designed for space-constrained, multi-rail embedded systems needing dual-output DC-DC regulation with minimal external components and guaranteed stability - targeting DTV, set-top boxes, and industrial edge devices.
FAQ
What is the recommended input capacitor configuration for LM26400YSDE/NOPB?
The LM26400YSDE/NOPB requires low-ESR ceramic input capacitors placed close to the PVIN and GND pins. TI recommends a 10-µF X5R/X7R MLCC (1210 case) plus a 0.22-µF ceramic (0603) in parallel. All four PVIN pins (11–14) must be tied together and connected directly to the capacitor bank to minimize loop inductance and ensure stable high-frequency operation.
Does LM26400YSDE/NOPB support prebiased output startup?
Yes, LM26400YSDE/NOPB supports prebiased startup if the input-to-output voltage difference is ≥2 V at turn-on. This capability allows safe powering of systems where output rails may retain residual voltage from backup sources. Startup behavior should be validated under worst-case prebias (e.g., 12 V input with 10 V output) using bench testing per Section 7.4.1 of the datasheet.
How does frequency foldback operate in LM26400YSDE/NOPB during overload?
In LM26400YSDE/NOPB, frequency foldback activates when the FB pin voltage drops to ≤0.35 V - typically during sustained overcurrent. The internal oscillator reduces switching frequency proportionally to maintain control, preventing destructive minimum-on-time violation and limiting thermal stress on both the IC and external catch diode. Recovery occurs automatically once load current decreases and FB rises above threshold.
Can LM26400YSDE/NOPB drive ceramic output capacitors without external compensation?
Yes, LM26400YSDE/NOPB includes fully integrated loop compensation optimized for ceramic output capacitors. No external compensation network is required - the internal transconductance amplifier and pole-zero placement ensure ≥50° phase margin across line, load, and temperature when using X5R/X7R MLCCs. This eliminates tuning effort and reduces BOM count.
What is the thermal performance difference between LM26400YSDE/NOPB and LM26420YMH/NOPB?
LM26400YSDE/NOPB in HTSSOP (PWP) has RθJA = 39.4°C/W on a standard 4-layer board, while LM26420YMH/NOPB in WSON (NHQ) has RθJA = 27.8°C/W. However, LM26400YSDE/NOPB's exposed PowerPAD provides lower thermal resistance to the PCB ground plane (RθJB = 18°C/W vs. 9.9°C/W), making it more effective in conduction-cooled or high-ambient applications despite higher junction-to-air rating.
LM26400YSDE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- 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-WSON (5x5)
LM26400YSDE/NOPB FAQ
1.How can I place an order for LM26400YSDE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM26400YSDE/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 LM26400YSDE/NOPB reliable?
The price and inventory of LM26400YSDE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM26400YSDE/NOPB is usually 5 days.
3.What payment methods are accepted for LM26400YSDE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM26400YSDE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM26400YSDE/NOPB?
LM26400YSDE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM26400YSDE/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 LM26400YSDE/NOPB?
For technical support, including LM26400YSDE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM26400YSDE/NOPB requirements.
6.How does Aetrix verify that LM26400YSDE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM26400YSDE/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 LM26400YSDE/NOPB meets industry standards.
7.What is the process for return or replacement of LM26400YSDE/NOPB?
All LM26400YSDE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM26400YSDE/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 LM26400YSDE/NOPB part is unused and in its original packaging.
Return procedure for LM26400YSDE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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