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Texas Instruments LM20146MHE/NOPB
- Part No.:
- LM20146MHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20146MHE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 6A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:623
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Product details
Overview
LM20146MHE/NOPB from Texas Instruments is a 6A synchronous buck regulator with peak current mode control, adjustable switching frequency (250–750 kHz), integrated 16 mΩ low-side and 20 mΩ high-side MOSFETs, and precision 0.8 V feedback reference. It delivers stable point-of-load regulation for FPGA, ASIC, and DSP core supplies from 2.95–5.5 V input rails.
For engineers reviewing the LM20146MHE/NOPB datasheet, LM20146MHE/NOPB pinout, LM20146MHE/NOPB application, or LM20146MHE/NOPB equivalent, key selection considerations include pre-biased startup capability, adjustable soft-start via external capacitor, output voltage tracking, integrated OVP/UVLO/thermal shutdown, and HTSSOP-16EP package thermal performance.
Technical Context
The LM20146MHE/NOPB implements nonlinear parabolic slope compensation to maintain loop stability across its full 0.8–5.5 V output range-unlike linear-slope competitors-and supports diode emulation mode for light-load efficiency optimization. Its peak current mode architecture enables single-loop compensation with only two external components (RC network on COMP) and inherent line feed-forward.
It features dual-function SS/TRK pin enabling either programmable soft-start (via external capacitor) or precise output voltage tracking of an upstream rail, while maintaining monotonic startup into pre-biased loads without sinking current. The internal 2.7 V VCC regulator and AVIN/AGND separation ensure analog bias integrity under dynamic load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6 A continuous-supports high-current digital loads without external FETs or heatsinks. |
| Input Voltage Range | 2.95 V to 5.5 V-directly compatible with standard 3.3 V and 5 V system buses. |
| Feedback Reference | 0.8 V ±1.5%-enables accurate low-voltage core supplies (e.g., 1.2 V, 1.5 V) with minimal resistor divider error. |
| Switching Frequency | 250 kHz to 750 kHz-adjustable via RT-to-GND resistor; higher frequencies allow smaller inductors and faster transient response. |
| Current Limit Threshold | 7.35 A to 9.35 A-tight tolerance minimizes required inductor saturation current margin. |
| Peak Efficiency | 97%-achieved at mid-load with optimized layout and ceramic output capacitors. |
| Thermal Shutdown | 160 °C with 10 °C hysteresis-protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LM20146MHE/NOPB uses a 16-pin HTSSOP package with exposed thermal pad (EP), optimized for surface-mount thermal dissipation on 2-layer or multilayer PCBs without external heatsinks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start/Tracking control | 5 µA internal current source charges external capacitor for controlled ramp; also accepts external voltage for rail tracking. |
| 2 FB | Feedback input | Connects to resistor divider; regulates output by comparing to internal 0.8 V reference. |
| 3 PGOOD | Open-drain power-good indicator | Sinks current when VOUT is within ±6% of target; requires external 10–100 kΩ pull-up. |
| 4 COMP | Compensation node | External RC network sets loop crossover and phase margin; supports all capacitor types. |
| 5 NC | No connect | Must be tied to AGND for proper operation per datasheet. |
| 6,7 PVIN | Power input to internal FETs | High-current input pins-must be shorted together and decoupled with low-ESR capacitor near package. |
| 8,9 SW | Switch node | Drives external inductor; high dv/dt node requiring tight layout and snubber if ringing observed. |
| 10,11 PGND | Power ground return | Low-impedance return path for switch currents; must be connected directly to EP and input/output caps. |
| 12 EN | Precision enable input | Turn-on threshold 1.18 V ±66 mV hysteresis; supports sequencing via resistor divider from VIN. |
| 13 VCC | Internal 2.7 V bias supply | Bypass with 1 µF ceramic capacitor to stabilize internal regulator. |
| 14 AVIN | Analog supply input | Must connect to PVIN through RC filter to reduce noise coupling into error amplifier. |
| 15 AGND | Analog ground reference | Quiet ground for FB, COMP, and internal bias-separate from PGND to avoid noise injection. |
| 16 RT | Frequency set input | Resistor to GND sets oscillator frequency; 49.9 kΩ yields ~750 kHz, 249 kΩ yields ~260 kHz. |
| EP | Exposed thermal pad | Electrically tied to PGND; must be soldered to large PCB copper area for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased startup | Starts without pulling down existing output voltage-critical for multi-rail systems with cross-coupled loads like FPGAs. |
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage level, ensuring stable current-mode control across 0.8–5.5 V without manual tuning. |
| Diode emulation mode | Disables reverse inductor current at light loads (<100 mA), eliminating shoot-through losses and improving efficiency. |
| Integrated protection suite | OVP (108% VFB), UVLO (2.7 V), thermal shutdown (160 °C), and cycle-by-cycle current limiting prevent fault propagation. |
| Adjustable soft-start | External capacitor on SS/TRK sets ramp time; eliminates inrush current stress on input bus and bulk capacitors. |
Applications
| Point-of-Load FPGA Core Supply | DSP/ASIC I/O Rail Regulation |
|---|---|
Use Scenario: Powering Xilinx or Intel FPGA core logic requiring tightly regulated 1.0–1.2 V at up to 6 A with fast load transients. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering core voltage; manages PGOOD sequencing with other rails. Use Value: Pre-biased startup prevents damage during hot-plug or multi-rail power-up; 97% peak efficiency reduces board-level heat density. | Use Scenario: Generating 1.8 V or 2.5 V I/O supply for high-speed SerDes interfaces in networking processors. IC Role / Device Role / Timing Role: Secondary buck regulator tracking a higher master rail via SS/TRK pin for controlled voltage ramp alignment. Use Value: Output voltage tracking ensures safe I/O interface power sequencing; adjustable frequency avoids EMI-sensitive bands. |
| Industrial PLC CPU Power | Optical Transceiver Bias Supply |
Use Scenario: Providing 3.3 V main CPU supply in ruggedized programmable logic controllers operating from 5 V backplane. IC Role / Device Role / Timing Role: Main DC-DC converter with precision enable (EN) for controlled cold-boot and watchdog-triggered reset sequencing. Use Value: 6 A capability supports burst-mode CPU loads; thermal shutdown protects against enclosure overheating in sealed enclosures. | Use Scenario: Generating stable 3.3 V bias for SFP+ or QSFP optical modules where ripple and noise affect signal integrity. IC Role / Device Role / Timing Role: Low-noise point-of-load regulator using AVIN/AGND separation and ceramic output caps to minimize PSRR degradation. Use Value: 0.8 V reference and tight FB tolerance (±1.5%) enable accurate 3.3 V generation; 16 mΩ/20 mΩ FETs reduce thermal drift in compact modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54620RGYR | Higher 6.5 A rating; fixed 600 kHz frequency; no SS/TRK tracking function; requires external compensation. | Lacks voltage tracking and pre-bias startup-unsuitable for multi-rail sequencing or hot-plug FPGA systems. | Select when fixed frequency simplifies EMI filtering and tracking is unnecessary. |
| MP2315DJ-LF-Z | Lower 3 A rating; 2.5–5.5 V input; no PGOOD or thermal shutdown; 12-pin QFN package. | Missing critical protections and monitoring signals-requires external circuitry for safety-critical industrial use. | Select only for cost-sensitive, non-safety-critical consumer applications with light loads. |
Compared with TPS54620RGYR and MP2315DJ-LF-Z, LM20146MHE/NOPB uniquely combines pre-biased startup, output voltage tracking, integrated PGOOD, and thermal protection in a thermally enhanced HTSSOP-16EP package-making it optimal for complex, sequenced, and reliability-critical embedded power systems.
Availability
LM20146MHE/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, DSP I/O rails, industrial PLC CPU power, and optical transceiver bias applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM20146MHE/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 LM20146MHE/NOPB belongs to TI's high-current synchronous buck regulator product line, designed specifically for demanding point-of-load applications in FPGA, ASIC, DSP, and telecom infrastructure where efficiency, thermal performance, and robust protection are mandatory.
FAQ
What is the minimum recommended output voltage for LM20146MHE/NOPB?
The LM20146MHE/NOPB supports an adjustable output voltage down to 0.8 V, set by the internal feedback reference voltage. This value is specified with ±1.5% tolerance over temperature and line, enabling accurate generation of common low-voltage rails such as 1.0 V, 1.2 V, and 1.5 V using standard resistor dividers. The 0.8 V reference is stable and does not require external trimming for most designs.
Does LM20146MHE/NOPB support startup into a pre-biased output?
Yes, LM20146MHE/NOPB supports pre-biased startup: when the output voltage is non-zero at enable, the device will not sink current or pull the rail low. Instead, it waits until the soft-start voltage on the SS/TRK pin exceeds the FB pin voltage before initiating switching. This behavior protects downstream loads-such as FPGAs with parasitic conduction paths-from damage during hot-plug or multi-rail power sequencing.
How is switching frequency adjusted on LM20146MHE/NOPB?
Switching frequency on LM20146MHE/NOPB is set by connecting an external resistor between the RT pin and ground. A 49.9 kΩ resistor yields ~750 kHz, while a 249 kΩ resistor yields ~260 kHz. The relationship is approximately linear across the 250–750 kHz range, and the RT pin draws negligible current-ensuring stable frequency setting without loading the resistor network.
What thermal performance can be expected from the LM20146MHE/NOPB HTSSOP-16EP package?
The LM20146MHE/NOPB in HTSSOP-16EP achieves a junction-to-ambient thermal resistance (θJA) of 25 °C/W when mounted on a 2" × 2" 4-layer FR4 PCB with the exposed pad fully soldered to a solid ground plane. This allows continuous 6 A operation at ambient temperatures up to +70 °C without forced airflow, provided input voltage remains ≤5 V and output voltage ≥1.2 V. Thermal shutdown activates at 160 °C with 10 °C hysteresis.
Can LM20146MHE/NOPB be used without an external soft-start capacitor?
Yes, LM20146MHE/NOPB includes an internal 1 ms soft-start timer that activates automatically if the SS/TRK pin is left unconnected or floating. However, an external capacitor is strongly recommended for applications requiring monotonic startup, precise timing control, or coordination with the PGOOD signal-especially in systems with multiple rails where sequencing accuracy is critical. The internal timer lacks tracking capability.
LM20146MHE/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:
- 1
- Voltage - Input (Min):
- 2.95V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 4.68V
- Current - Output:
- 6A
- Frequency - Switching:
- 260kHz ~ 750kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20146MHE/NOPB FAQ
1.How can I place an order for LM20146MHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20146MHE/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 LM20146MHE/NOPB reliable?
The price and inventory of LM20146MHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20146MHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM20146MHE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20146MHE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20146MHE/NOPB?
LM20146MHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20146MHE/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 LM20146MHE/NOPB?
For technical support, including LM20146MHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20146MHE/NOPB requirements.
6.How does Aetrix verify that LM20146MHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20146MHE/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 LM20146MHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM20146MHE/NOPB?
All LM20146MHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20146MHE/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 LM20146MHE/NOPB part is unused and in its original packaging.
Return procedure for LM20146MHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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