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Texas Instruments LM20124MHX/NOPB
- Part No.:
- LM20124MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20124MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,495
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Product details
Overview
LM20124MHX/NOPB from Texas Instruments is a 4A, 1 MHz synchronous buck regulator with peak current mode control, integrated 32 mΩ high- and low-side FETs, and precision 0.8 V feedback reference. It operates from 2.95 V to 5.5 V input, delivers adjustable output down to 0.8 V, and supports pre-biased start-up - ideal for powering FPGAs, DSPs, and ASICs from 3.3 V or 5 V rails.
For engineers reviewing the LM20124MHX/NOPB datasheet, LM20124MHX/NOPB pinout, LM20124MHX/NOPB application, or LM20124MHX/NOPB equivalent, key selection criteria include its 1 MHz fixed-frequency operation, ±1.5% feedback voltage accuracy, integrated OVP/UVLO/thermal shutdown, soft-start/tracking dual-function pin, and TSSOP-16EP package with exposed thermal pad.
Technical Context
The LM20124MHX/NOPB implements peak current mode control with nonlinear parabolic slope compensation - dynamically adjusted per output voltage to ensure stability across 0.8 V–3.3 V outputs without external tuning. Its transconductance error amplifier (gm = 510 µmho) interfaces directly with the COMP pin for two-component loop compensation.
It integrates dual power switches (RDS(on) = 36 mΩ HS / 32 mΩ LS), a 2.7 V internal sub-regulator (VCC), analog bias supply filtering (AVIN/AGND), and precision enable logic with 1.18 V turn-on threshold and 66 mV hysteresis - enabling accurate supply sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4 A continuous - supports high-current digital loads without external MOSFETs or heatsinks. |
| Switching Frequency | 1 MHz (±10%) - enables compact 1 µH inductors and reduces EMI filter size. |
| Feedback Voltage | 0.8 V ±1.5% - sets output as low as 0.8 V with <0.08%/A load regulation. |
| Input Voltage Range | 2.95 V to 5.5 V - compatible with standard 3.3 V and 5 V intermediate buses. |
| Current Limit Threshold | 6.0 A typical - tightly controlled over −40°C to +125°C for reliable inductor sizing. |
| Efficiency | 96% at 1 MHz - achieved via low RDS(on) FETs and diode emulation mode at light loads. |
| Thermal Shutdown | 160°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
TSSOP-16 with exposed thermal pad (Package PWP0016A); pad must be soldered to PCB ground plane for thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-Start / Tracking control | 5 µA internal current source charges external capacitor for monotonic start-up; also accepts external voltage for rail tracking. |
| 2 FB | Feedback input | Connects to resistor divider; regulates output by comparing against 0.8 V internal reference. |
| 3 PGOOD | Open-drain power-good indicator | Asserts high when VOUT is within ±6% of target; requires 10 kΩ–100 kΩ pull-up. |
| 4 COMP | Compensation node | Interface for RC network to set loop crossover frequency and phase margin. |
| 5,16 NC | No-connect | Must be tied to AGND for proper operation and noise immunity. |
| 6,7 PVIN | Main power input | High-current path to internal FETs; requires local low-ESR input capacitor. |
| 8,9 SW | Switch node | Drives external inductor; high dv/dt node requiring careful layout and optional snubber. |
| 10,11 PGND | Power ground | Return path for switch currents; separate from AGND to minimize noise coupling. |
| 12 EN | Enable input | 1.18 V threshold with hysteresis; enables precise input-voltage sequencing via resistor divider. |
| 13 VCC | Internal 2.7 V regulator output | Bypass with 1 µF ceramic capacitor; powers internal logic and gate drivers. |
| 14 AVIN | Analog supply input | Filtered input for bias circuitry; connect to PVIN via RC low-pass filter (RF/CF). |
| 15 AGND | Analog ground | Quiet reference for error amplifier and comparators; tie to system ground at single point. |
| EP | Exposed thermal pad | Electrically connected to GND; mandatory solder connection to PCB ground plane for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current mode control with parabolic slope compensation | Stabilizes loop across full output range (0.8 V–3.3 V) without re-tuning compensation components. |
| Pre-biased start-up capability | Prevents sinking current during startup when output is already biased - avoids load damage in FPGA/ASIC systems. |
| Adjustable soft-start and voltage tracking | Single SS/TRK pin supports both monotonic ramp-up and synchronized rail sequencing with external sources. |
| Integrated protection suite | OVP (108% VFB trip), UVLO (2.7 V), thermal shutdown (160°C), and cycle-by-cycle current limiting. |
| Diode emulation mode | Disables reverse inductor current at light loads (<100 mA), improving efficiency without external diode. |
Applications
| FPGA Core Power Supply | DSP I/O Rail Sequencing |
|---|---|
|
Use Scenario: Powers Xilinx or Intel FPGA core voltage (e.g., 1.0 V or 1.2 V) from a 3.3 V intermediate bus with strict monotonicity requirements. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering up to 4 A with pre-bias tolerance and PGOOD signaling for system boot validation. Use Value: Eliminates need for external current-sense resistors or discrete MOSFETs while ensuring safe start-up into pre-charged rails. |
Use Scenario: Supplies configurable I/O banks on TI C6000 DSPs requiring coordinated voltage ramping relative to core supply. IC Role / Device Role / Timing Role: Tracking buck regulator using SS/TRK pin to follow a master 1.8 V rail during power-up and power-down. Use Value: Achieves precise inter-rail timing alignment without additional op-amps or dedicated sequencer ICs. |
| Optical Transceiver Biasing | Industrial PLC Digital Logic Rail |
|
Use Scenario: Generates stable 2.5 V or 3.3 V for SFP+ or QSFP transceiver modules in telecom line cards. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator operating at 1 MHz to minimize conducted EMI near sensitive RF sections. Use Value: Delivers 96% efficiency at full load with integrated FETs, reducing board area and thermal management complexity. |
Use Scenario: Supplies 1.8 V or 2.5 V logic rails in DIN-rail mounted PLC controllers subject to wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust buck converter with −40°C to +125°C junction rating, UVLO hysteresis, and thermal shutdown. Use Value: Maintains regulation under brown-out conditions and survives sustained overload events without latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3 A rated, 1.2 MHz switching, no pre-bias start-up, higher quiescent current (120 µA vs. 90 µA shutdown) | Lacks SS/TRK tracking function and pre-biased start-up - unsuitable for FPGA/ASIC multi-rail sequencing | Choose when lower cost and smaller footprint outweigh need for rail tracking and pre-bias tolerance. |
| MP2315DJ-LF-Z | 3.5 A rated, 500 kHz switching, no integrated OVP, requires external soft-start capacitor | Missing PGOOD, OVP, and precision enable - demands additional support circuitry for industrial reliability | Consider only for space-constrained consumer designs where full protection and sequencing are not required. |
Compared with TPS54332DR and MP2315DJ-LF-Z, the LM20124MHX/NOPB uniquely combines 4 A output, 1 MHz operation, pre-biased start-up, and dual-function SS/TRK in a thermally enhanced TSSOP package - making it optimal for high-reliability, multi-rail embedded systems where sequencing integrity and fault coverage are critical.
Availability
LM20124MHX/NOPB is available at Aetrix Electronics and suitable for FPGA power delivery, DSP I/O sequencing, optical transceiver biasing, and industrial PLC logic rails requiring stable component supply and long-term manufacturability.
Supply support for LM20124MHX/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 LM20124MHX/NOPB belongs to TI's PowerWise® synchronous buck regulator family, designed specifically for high-efficiency, low-voltage point-of-load applications in FPGA, DSP, and ASIC power architectures.
FAQ
What is the recommended input capacitor for LM20124MHX/NOPB?
A 22 µF X5R/X7R ceramic capacitor rated for ≥6.3 V is recommended and must be placed adjacent to the PVIN and PGND pins. For high-RMS-current applications or long input traces, parallel with a bulk capacitor (e.g., 100 µF polymer) to reduce input ripple and maintain stability under dynamic load steps.
Does LM20124MHX/NOPB support output voltage tracking?
Yes, the LM20124MHX/NOPB supports voltage tracking via its SS/TRK pin. When driven by an external voltage source below 800 mV, the pin overrides the internal reference and forces the output to track that source - enabling precise sequencing with master rails in multi-supply systems.
Can LM20124MHX/NOPB start up into a pre-biased output?
Yes, the LM20124MHX/NOPB supports pre-biased start-up. During startup, it will not sink current from a pre-charged output until the internal soft-start ramp exceeds the FB pin voltage - protecting downstream FPGA or ASIC loads from parasitic conduction damage.
What is the purpose of the AVIN and AGND pins on LM20124MHX/NOPB?
The AVIN pin supplies filtered analog bias to internal comparators and the error amplifier; it must be connected to PVIN through an RC filter (RF/CF). AGND is the quiet analog ground reference - physically separated from PGND to prevent switching noise from degrading regulation accuracy and PGOOD response.
How is loop compensation implemented for LM20124MHX/NOPB?
Loop compensation for LM20124MHX/NOPB is implemented externally at the COMP pin using a series RC network (RC1/CC1). This two-component configuration sets dominant pole and zero locations to achieve >45° phase margin across load and input variations - eliminating need for complex Type II/III compensators.
LM20124MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerWise®
- 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:
- 4A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20124MHX/NOPB FAQ
1.How can I place an order for LM20124MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20124MHX/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 LM20124MHX/NOPB reliable?
The price and inventory of LM20124MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20124MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM20124MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20124MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20124MHX/NOPB?
LM20124MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20124MHX/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 LM20124MHX/NOPB?
For technical support, including LM20124MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20124MHX/NOPB requirements.
6.How does Aetrix verify that LM20124MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20124MHX/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 LM20124MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM20124MHX/NOPB?
All LM20124MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20124MHX/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 LM20124MHX/NOPB part is unused and in its original packaging.
Return procedure for LM20124MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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