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Texas Instruments LM20124MHE/NOPB
- Part No.:
- LM20124MHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20124MHE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:248
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Product details
Overview
LM20124MHE/NOPB from Texas Instruments is a 4A, 1 MHz synchronous buck regulator in a 16-pin TSSOP with exposed pad, delivering adjustable output down to 0.8V from 2.95–5.5V input, featuring peak current mode control, pre-bias startup, and integrated OVP/UVLO/thermal shutdown - used for point-of-load regulation in FPGA, DSP, and ASIC power rails.
For engineers reviewing the LM20124MHE/NOPB datasheet, LM20124MHE/NOPB pinout, LM20124MHE/NOPB application, or LM20124MHE/NOPB equivalent, key selection criteria include its 32 mΩ integrated FETs, ±1.5% feedback voltage accuracy, 1 ms internal soft-start, PGOOD open-drain signaling, and compatibility with ceramic output capacitors in space-constrained industrial and communications systems.
Technical Context
The LM20124MHE/NOPB implements peak current mode control with nonlinear parabolic slope compensation, enabling stable operation across 0.8–5.5V output range without external ramp injection. Its transconductance error amplifier (gm = 510 µmho) interfaces with COMP pin for two-component Type II compensation.
It integrates dual 32–55 mΩ MOSFETs, precision 0.8V reference (±1.5%), 66 mV EN hysteresis, and 16 µs PGOOD deglitching. The SS/TRK pin supports both programmable soft-start (via external capacitor) and voltage tracking (via resistor divider), while pre-bias startup prevents sinking current during powered-up load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports high-current digital loads like FPGAs without external current sharing. |
| Switching Frequency | 1 MHz (±10%) - enables compact 1 µH inductors and reduces EMI filtering burden. |
| Feedback Voltage | 0.8 V ±1.5% - sets output as low as 0.8V with <0.08%/A load regulation for tight rail tolerance. |
| Input Voltage Range | 2.95 V to 5.5 V - compatible with 3.3V and 5V intermediate buses in multi-rail systems. |
| High-Side RDS(on) | 36–55 mΩ at 3.5A - minimizes conduction loss and thermal rise under full load. |
| Current Limit Threshold | 5.4–6.6 A - factory-trimmed ±10% over temperature, enabling smaller inductors with lower saturation current. |
| Quiescent Current | 3.5–6 mA - maintains efficiency at light loads without forced PWM mode penalty. |
Pinout & Package
LM20124MHE/NOPB uses a 16-pin TSSOP package (PWP0016A) with exposed thermal pad (EP), rated θJA = 38°C/W. The exposed pad must be soldered to PCB ground plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-Start / Tracking control | 5 µA internal current source charges external capacitor for monotonic startup; <0.8V input enables voltage tracking of higher rail. |
| 2 FB | Feedback input | Connects to resistor divider; regulates output to 0.8V reference with 1 nA bias current for minimal divider error. |
| 3 PGOOD | Open-drain power-good indicator | Asserts low when VOUT deviates >6% from target; requires 10–100 kΩ pull-up for sequencing and fault detection. |
| 4 COMP | Compensation node | Interface for Type II network (RC1, CC1); sets loop crossover and phase margin for stability with any output capacitor type. |
| 5,16 NC | No-connect | Must be tied to AGND or PGND per layout guidelines to prevent noise coupling and ensure proper biasing. |
| 6,7 PVIN | Main power input | High-current path for switch supply; requires local low-ESR ceramic capacitor (e.g., 22 µF X5R) placed adjacent to pins. |
| 8,9 SW | Power switch node | Drives external inductor; high di/dt node requiring minimized trace area and optional RC snubber for ringing suppression. |
| 10,11 PGND | Power ground return | Low-impedance return for switch currents; must be separated from AGND and connected only at single-point star ground. |
| 12 EN | Precision enable input | Turn-on threshold 1.18V ±66 mV hysteresis; supports precise input-voltage sequencing via resistor divider from PVIN. |
| 13 VCC | Internal 2.7V sub-regulator output | Bypass with 1 µF ceramic capacitor to stabilize gate drive and analog circuitry; decouples from noisy PVIN. |
| 14 AVIN | Analog supply input | Filtered version of PVIN (via RC network) powering error amplifier and reference; improves PSRR and noise immunity. |
| 15 AGND | Analog ground reference | Quiet ground for FB, COMP, and AVIN circuits; isolated from PGND except at single-point connection near AVIN filter. |
| EP | Exposed thermal pad | Electrically weakly tied to GND; must be soldered to large copper pour for thermal dissipation and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage, eliminating sub-harmonic oscillation across full 0.8–5.5V range without manual tuning. |
| Pre-bias startup capability | Does not sink current on startup if VOUT > 0V - protects FPGA/ASIC I/O from reverse current damage in multi-rail sequencing. |
| Diode emulation mode | Disables low-side FET at zero inductor current, preventing negative current and improving light-load efficiency below 100 mA. |
| Integrated protection suite | OVP (108% of VFB), UVLO (2.7V ±45 mV), thermal shutdown (160°C), and cycle-by-cycle current limiting - no external components required. |
| Adjustable soft-start & tracking | Single SS/TRK pin configures either 1 ms internal ramp or external capacitor-based timing; also accepts external voltage for rail tracking. |
Applications
| FPGA Core Power Supply | DSP Point-of-Load Regulation |
|---|---|
|
Use Scenario: Powers 1.2V core rail of Xilinx Kintex-7 FPGA during configuration and active operation, handling 0–3.5A dynamic load steps. IC Role / Device Role / Timing Role: Primary synchronous buck converter providing regulated DC output with PGOOD sequencing signal for FPGA configuration lock. Use Value: Pre-bias startup avoids back-driving configuration I/O; 96% efficiency at 1 MHz reduces thermal load in dense BGA packages. |
Use Scenario: Supplies 1.0V I/O rail for TI C66x DSP in wireless baseband processing, responding to burst-mode current demands. IC Role / Device Role / Timing Role: High-bandwidth buck regulator with fast transient response (<10 µs recovery) enabled by peak current mode control. Use Value: 32 mΩ FETs and 16 µs PGOOD deglitching ensure stable rail during RF transmit bursts without false fault triggering. |
| Optical Transceiver Module | Industrial PLC CPU Power |
|
Use Scenario: Generates 3.3V auxiliary supply for SFP+ module laser driver and serializer-deserializer ICs in telecom line cards. IC Role / Device Role / Timing Role: Secondary buck regulator tracking main 5V rail via SS/TRK pin to meet hot-swap and inrush current limits. Use Value: Voltage tracking ensures monotonic power-up across multiple rails; TSSOP-EP package fits narrow 1U card spacing. |
Use Scenario: Delivers 2.5V logic supply to ARM Cortex-M7 microcontroller in DIN-rail mounted PLC, operating continuously at -40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade DC-DC converter with 125°C junction rating and robust OVP/UVP fault handling. Use Value: Integrated thermal shutdown (160°C) and 38°C/W θJA enable reliable operation in sealed enclosures without forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20RTWR | 4A, 1.5 MHz, 0.6V ref, integrated MOSFETs (2.8/1.8 mΩ), requires external compensation. | Higher switching frequency enables smaller magnetics but increases EMI filtering complexity. | Preferred for designs prioritizing size over thermal margin; not drop-in due to different pinout and ref voltage. |
| MP2315GJ-Z | 4A, 1 MHz, 0.8V ref, 35/25 mΩ FETs, no SS/TRK or tracking, simpler EN/PGOOD interface. | Lacks voltage tracking and pre-bias startup - unsuitable for FPGA/ASIC sequencing-critical systems. | Lower-cost option for fixed-output, non-sequencing applications where tracking and robust startup are not required. |
Compared with LM20124MHE/NOPB, TPS544B20RTWR offers higher efficiency at light loads but requires more complex layout and lacks tracking; MP2315GJ-Z simplifies design but sacrifices critical sequencing features needed in multi-rail digital systems.
Availability
LM20124MHE/NOPB is available at Aetrix Electronics and suitable for FPGA power delivery, DSP point-of-load regulation, optical transceiver modules, and industrial PLC CPU supplies requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for LM20124MHE/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 power conversion ICs.
The LM20124MHE/NOPB belongs to TI's PowerWise® synchronous buck regulator family, engineered for high-efficiency, low-noise, and robust sequencing in demanding digital load applications including communications infrastructure and industrial automation.
FAQ
What is the recommended input capacitor for LM20124MHE/NOPB?
A 22 µF X5R/X7R ceramic capacitor rated ≥6.3V is recommended for most applications, placed directly between PVIN and PGND pins. This value provides sufficient RMS current handling and low impedance at 1 MHz. If the input source has high impedance or long traces, add parallel bulk capacitance (e.g., 100 µF tantalum) to reduce input ripple and prevent UVLO triggering during load transients. The LM20124MHE/NOPB datasheet specifies this configuration for stable operation across its 2.95–5.5V input range.
Does LM20124MHE/NOPB support output voltage tracking?
Yes, LM20124MHE/NOPB supports voltage tracking via its SS/TRK pin. When driven by an external voltage source below 0.8V, the pin overrides the internal reference and forces the FB node to track that source, enabling coordinated power-up with higher-voltage rails. This behavior is confirmed in the datasheet's Pin Descriptions and Operation Description sections. The LM20124MHE/NOPB does not require additional ICs or complex circuitry to implement rail tracking - it is a native, validated function of the device.
Can LM20124MHE/NOPB start up into a pre-biased output?
Yes, LM20124MHE/NOPB supports pre-bias startup: it will not sink current from a pre-charged output during startup. Instead, it waits until the internal soft-start ramp exceeds the existing FB voltage before enabling switching. This prevents reverse current flow through parasitic paths in FPGAs, ASICs, or DSPs - a critical feature verified in the datasheet's "Pre-Bias Start Up Capability" section. The LM20124MHE/NOPB maintains this behavior across its full operating temperature range (-40°C to +125°C).
What is the maximum achievable output voltage accuracy for LM20124MHE/NOPB?
The LM20124MHE/NOPB achieves ±1.5% output voltage accuracy over temperature and line, based on its 0.8V feedback reference (0.788–0.812V). Combined with standard 1% resistor tolerances in the RFB1/RFB2 divider, total system accuracy remains within ±2.5%. This is confirmed in the Electrical Characteristics table and supported by low FB bias current (1 nA), minimizing divider error. For precision applications, the LM20124MHE/NOPB's tight reference and stable compensation architecture deliver repeatable regulation without calibration.
How does LM20124MHE/NOPB handle light-load efficiency?
LM20124MHE/NOPB improves light-load efficiency via diode emulation mode: when inductor current reaches zero, the low-side FET turns off, preventing reverse current and reducing switching losses. Below ~100 mA, it further skips pulses to lower effective frequency. These behaviors are documented in the "Light Load Operation" section and validated in Figure 10 (quiescent current vs. VIN) and Figure 17 (load transient response). The LM20124MHE/NOPB maintains >85% efficiency at 100 mA load with 5V input and 1.2V output.
LM20124MHE/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
LM20124MHE/NOPB FAQ
1.How can I place an order for LM20124MHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20124MHE/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 LM20124MHE/NOPB reliable?
The price and inventory of LM20124MHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20124MHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM20124MHE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20124MHE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20124MHE/NOPB?
LM20124MHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20124MHE/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 LM20124MHE/NOPB?
For technical support, including LM20124MHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20124MHE/NOPB requirements.
6.How does Aetrix verify that LM20124MHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20124MHE/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 LM20124MHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM20124MHE/NOPB?
All LM20124MHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20124MHE/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 LM20124MHE/NOPB part is unused and in its original packaging.
Return procedure for LM20124MHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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