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Texas Instruments LM20154MHE/NOPB
- Part No.:
- LM20154MHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20154MHE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:312
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Product details
Overview
LM20154MHE/NOPB from Texas Instruments is a 4A, 1 MHz synchronous buck regulator in HTSSOP-16 with exposed pad, featuring peak current mode control, 0.8V adjustable output, integrated 32 mΩ/36 mΩ FETs, and SYNCOUT phase-shifted clock output. It delivers high efficiency (96% peak) for FPGA, DSP, and ASIC core supplies from 2.95–5.5V input rails.
For engineers reviewing the LM20154MHE/NOPB datasheet, LM20154MHE/NOPB pinout, LM20154MHE/NOPB application, or LM20154MHE/NOPB equivalent, key selection criteria include pre-biased startup capability, ±10 mV tracking accuracy on SS/TRK, 180° SYNCOUT phase shift for multi-converter interleaving, and thermal shutdown at 160°C with 10°C hysteresis.
Technical Context
The LM20154MHE/NOPB implements peak current mode control with nonlinear parabolic slope compensation-dynamically adjusted per output voltage-to ensure stability across 0.8V–VIN−0.5V output range without external loop tuning beyond COMP network. Its dual FET architecture integrates high-side and low-side switches with matched RDS(on) (32 mΩ/36 mΩ typ), enabling continuous 4A output with minimal conduction loss.
Internal circuitry includes precision 0.8V feedback reference (±1.5% over temp), 1.18V enable threshold with 66 mV hysteresis, and open-drain PGOOD with 16 µs deglitching. The SYNCOUT pin provides exact 1 MHz frequency (850–1150 kHz min/max) with fixed 180° phase shift relative to SW node, supporting deterministic multi-phase synchronization without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports FPGA core rails and high-performance SoC power domains without external current sharing. |
| Switching Frequency | 1 MHz (850–1150 kHz) - enables compact 1 µH inductors and reduces EMI fundamental while maintaining >90% efficiency at full load. |
| Feedback Voltage | 0.8V ±12 mV - sets minimum output voltage; allows precise 0.8V–5.0V regulation via RFB1/RFB2 divider with <0.08%/A load regulation. |
| Current Limit | 6.0A typical - ensures robust short-circuit protection while permitting use of smaller inductors with lower saturation current ratings. |
| SYNCOUT Phase Shift | 180° fixed - enables out-of-phase interleaving with identical converters (e.g., LM20134) to halve input RMS ripple and reduce required CIN size. |
| Thermal Shutdown | 160°C with 10°C hysteresis - protects against sustained overload; auto-recovery at ~150°C prevents latch-up during transient thermal events. |
| Pre-Bias Startup | Supported - prevents sinking current into pre-charged outputs (e.g., multi-rail FPGA systems), avoiding damage through parasitic load paths. |
Pinout & Package
LM20154MHE/NOPB uses a thermally enhanced 16-pin HTSSOP package with exposed pad (EP), optimized for PCB heat spreading without heatsinks. Pin 1 (SS/TRK) supports soft-start timing or voltage tracking; Pin 16 (SYNCOUT) is NMOS open-drain with 1.8 mA sink capability at 0.8V.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-Start/Tracking control | 5 µA internal current source charges external capacitor for monotonic startup; also accepts external voltage ≤800 mV to force output tracking. |
| 2 FB | Feedback input | Connects to resistor divider; regulates output by comparing against internal 0.8V reference; bias current <100 nA minimizes divider error. |
| 3 PGOOD | Power-good indicator | Open-drain output asserts high when VOUT is within ±6% of target; requires 10–100 kΩ pull-up; 16 µs deglitch prevents false trips. |
| 4 COMP | Compensation node | External RC network sets loop crossover and phase margin; supports ceramic, polymer, or electrolytic output capacitors without instability. |
| 5 NC | No-connect | Must be tied to AGND for proper operation; not internally connected but electrically critical for noise isolation. |
| 6,7 PVIN | Power input supply | High-current input pins for switch FETs; require low-ESR bulk capacitance placed directly at these pins to suppress switching noise. |
| 8,9 SW | Switch node | Drives external inductor; high di/dt node requiring tight layout; connects to L, CIN, and COUT ground return path. |
| 10,11 PGND | Power ground | Separate ground return for high-current FET paths; must be isolated from AGND except at single-point star connection. |
| 12 EN | Enable control | Precision analog input with 1.18V turn-on threshold and 66 mV hysteresis; supports programmable UVLO using resistor divider from PVIN. |
| 13 VCC | Internal sub-regulator | 2.7V internal LDO output; bypassed with 1 µF ceramic capacitor to stabilize gate drive and internal bias circuits. |
| 14 AVIN | Analog supply filter | Must connect to PVIN via RC filter (e.g., 10 Ω + 1 µF) to reject switching noise from analog reference and error amplifier. |
| 15 AGND | Analog ground | Quiet reference ground for FB, COMP, and internal reference; routed separately from PGND and joined only at EP or single point. |
| 16 SYNCOUT | Synchronization output | NMOS open-drain output synchronized to oscillator; 180° phase shift enables interleaved multi-converter designs without external clock generator. |
| EP | Exposed thermal pad | Weakly tied to GND internally; must be soldered to large PCB copper area for thermal resistance reduction (θJA = 38°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage-ensures stable current-mode control across full 0.8V–4.5V output range without manual compensation adjustment. |
| Pre-biased startup | Zero-sink behavior during start-up prevents reverse current flow into pre-charged loads (e.g., FPGA I/O banks), eliminating risk of latch-up or damage. |
| Diode emulation mode | Disables low-side FET at zero inductor current-eliminates reverse conduction losses and improves light-load efficiency below 100 mA. |
| Adjustable soft-start | External capacitor on SS/TRK sets ramp time; default 1 ms internal ramp ensures controlled inrush without external parts if not needed. |
| Integrated OVP/UVP | 108% rising OVP threshold with 3% hysteresis and 94% falling PGOOD threshold provide fast fault detection while rejecting transient glitches. |
| HTSSOP thermal design | Exposed pad and split ground pins (PGND/AGND) enable >2.6W power dissipation in standard PCB layouts-no heatsink required for 4A operation. |
Applications
| FPGA Core Power Supply | DSP/ASIC Point-of-Load Regulation |
|---|---|
|
Use Scenario: Powers 1.0V–1.2V core rail of Xilinx Artix-7 or Intel Cyclone V FPGA during configuration and active computation. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering up to 4A with monotonic startup and PGOOD sequencing for configuration logic. Use Value: Pre-biased startup avoids conflict with I/O bank voltages; 96% peak efficiency reduces thermal load on dense BGA packages. |
Use Scenario: Supplies variable-core-voltage DSPs (e.g., TI C66x) requiring dynamic VDD scaling between 0.95V and 1.1V under software control. IC Role / Device Role / Timing Role: Adjustable-output buck converter with tracking capability (via SS/TRK) to follow auxiliary voltage rails during state transitions. Use Value: ±10 mV tracking accuracy ensures tight voltage alignment; 1 MHz switching enables fast transient response to sudden load steps. |
| Optical Line Card DC-DC Conversion | Industrial PLC CPU Module |
|
Use Scenario: Generates 3.3V/2.5V/1.8V rails from 5V backplane in telecom line cards with strict EMI limits and space constraints. IC Role / Device Role / Timing Role: Multi-rail buck regulator synchronized via SYNCOUT to align switching edges and minimize conducted EMI peaks. Use Value: 180° phase-shifted SYNCOUT enables deterministic interleaving with adjacent converters-reducing input capacitor RMS current by up to 30%. |
Use Scenario: Powers ARM Cortex-A9-based PLC controller in harsh industrial environments with wide ambient temperature swings (−40°C to +85°C). IC Role / Device Role / Timing Role: Robust point-of-load regulator with thermal shutdown (160°C), UVLO hysteresis (45 mV), and extended junction temp rating (125°C). Use Value: Guaranteed operation across full industrial temp range; exposed-pad HTSSOP maintains reliability without forced air or heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM20145MHX/NOPB | Higher 5A output rating, same 1 MHz frequency and HTSSOP-16 package; RDS(on) reduced to 25 mΩ/28 mΩ; no SYNCOUT pin. | Lacks SYNCOUT functionality-unsuitable for multi-converter interleaving; better for single-rail high-current apps where footprint compatibility is critical. | Select LM20145MHX/NOPB when output current >4A is required and synchronization is unnecessary; verify PGOOD timing matches system sequencing. |
| TPS544B20RTWR | 4A, 1.5 MHz, 3 mm × 3 mm QFN; integrated MOSFETs with 12 mΩ/8 mΩ RDS(on); PMBus interface and digital compensation; no SYNCOUT phase shift. | Digital control enables dynamic loop tuning and telemetry; smaller footprint but requires firmware integration; lacks analog SYNCOUT for simple hardware sync. | Choose TPS544B20RTWR for space-constrained designs needing telemetry or adaptive compensation; avoid if analog-only sync or minimal BOM is mandatory. |
Compared with LM20154MHE/NOPB, LM20145MHX/NOPB trades SYNCOUT for higher current and lower RDS(on), while TPS544B20RTWR replaces analog simplicity with digital configurability and smaller size-neither offers the exact 180° hardware-sync capability critical for EMI-sensitive multi-converter systems.
Availability
LM20154MHE/NOPB is available at Aetrix Electronics and suitable for FPGA core power, DSP point-of-load regulation, optical line card DC-DC conversion, industrial PLC CPU modules, and broadband infrastructure requiring stable component supply with consistent parametric performance.
Supply support for LM20154MHE/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-efficiency DC-DC conversion and automotive-grade reliability.
The LM20154MHE/NOPB belongs to TI's high-frequency synchronous buck regulator product line, designed specifically for space-constrained, high-efficiency point-of-load applications in communications, computing, and industrial systems where thermal performance and multi-rail coordination are critical.
FAQ
What is the maximum supported input voltage for LM20154MHE/NOPB?
The LM20154MHE/NOPB operates over an input voltage range of 2.95V to 5.5V. Absolute maximum rating for PVIN, AVIN, and EN pins is +6V, but sustained operation above 5.5V violates operating specifications and may trigger overvoltage protection or cause permanent damage. Always maintain PVIN within 2.95–5.5V for guaranteed performance and reliability of the LM20154MHE/NOPB.
Does LM20154MHE/NOPB support output voltage tracking, and how is it implemented?
Yes, LM20154MHE/NOPB supports output voltage tracking via the SS/TRK pin. When driven by an external voltage ≤800 mV (e.g., from another regulator's feedback or reference), the LM20154MHE/NOPB output follows that signal with ±10 mV accuracy. This enables coordinated power-up sequencing in multi-rail systems such as FPGAs, where core voltage must ramp after I/O voltage.
Can LM20154MHE/NOPB start up into a pre-biased output, and what happens during that condition?
Yes, LM20154MHE/NOPB supports pre-biased startup. During startup with a non-zero output voltage, the device does not sink current-the low-side FET remains off until the internal soft-start ramp exceeds the FB pin voltage. This prevents reverse current flow through parasitic load paths, protecting sensitive devices like ASICs and DSPs powered by the LM20154MHE/NOPB.
What is the purpose of the SYNCOUT pin on LM20154MHE/NOPB, and how is it used?
The SYNCOUT pin on LM20154MHE/NOPB is an NMOS open-drain output providing a 1 MHz clock signal phase-shifted by exactly 180° relative to the high-side switch node. It enables hardware-level interleaving with other compatible regulators (e.g., LM20134) to reduce input ripple current and conducted EMI-no external clock generator or timing IC is required for this function in the LM20154MHE/NOPB.
How does the LM20154MHE/NOPB handle light-load efficiency, and what modes are active?
LM20154MHE/NOPB improves light-load efficiency via diode emulation mode-disabling the low-side FET at zero inductor current-and pulse-skipping mode below ~100 mA. These features eliminate reverse conduction losses and reduce switching losses respectively, maintaining >85% efficiency at 10 mA load while preserving regulation accuracy and transient response of the LM20154MHE/NOPB.
LM20154MHE/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
LM20154MHE/NOPB FAQ
1.How can I place an order for LM20154MHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20154MHE/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 LM20154MHE/NOPB reliable?
The price and inventory of LM20154MHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20154MHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM20154MHE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20154MHE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20154MHE/NOPB?
LM20154MHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20154MHE/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 LM20154MHE/NOPB?
For technical support, including LM20154MHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20154MHE/NOPB requirements.
6.How does Aetrix verify that LM20154MHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20154MHE/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 LM20154MHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM20154MHE/NOPB?
All LM20154MHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20154MHE/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 LM20154MHE/NOPB part is unused and in its original packaging.
Return procedure for LM20154MHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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