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Texas Instruments LM20154MH/NOPB
- Part No.:
- LM20154MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20154MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:341
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Product details
Overview
LM20154MH/NOPB from Texas Instruments is a 4A, 1 MHz synchronous buck regulator in HTSSOP-16 with exposed pad, delivering regulated DC/DC conversion from 2.95V–5.5V input to adjustable output down to 0.8V. It integrates 32 mΩ high-side and 32 mΩ low-side MOSFETs, features peak current mode control with nonlinear slope compensation, and supports pre-biased start-up-used in FPGA core power, DSP supply rails, and multi-rail telecom systems.
For engineers reviewing the LM20154MH/NOPB datasheet, LM20154MH/NOPB pinout, LM20154MH/NOPB application, or LM20154MH/NOPB equivalent, key selection criteria include its 1 MHz fixed-frequency operation, SYNCOUT phase-shifted clock output, precision enable threshold (1.18 V), PGOOD open-drain status signal, and soft-start/tracking dual-function SS/TRK pin for sequencing and monotonic startup.
Technical Context
The LM20154MH/NOPB employs peak current mode control with parabolic slope compensation-dynamically adjusted per output voltage-to ensure stability across 0.8V–VIN−0.3V output range without external loop tuning complexity. Its internal 2.7V VCC regulator powers analog circuitry, while AVIN/AGND separation isolates noise-sensitive bias paths from power-switching grounds.
It integrates OVP (108% of VFB), thermal shutdown (160°C), UVLO (2.7V with 45 mV hysteresis), and cycle-by-cycle current limiting (6.0 A typical). The SYNCOUT pin delivers an NMOS open-drain 180° phase-shifted 1 MHz clock synchronized to internal switching, enabling out-of-phase interleaving with compatible regulators like LM20134 to reduce input RMS ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4 A continuous-supports high-current digital loads like FPGA I/O banks without external current sharing. |
| Switching Frequency | 1 MHz ±15%-enables compact 1 µH inductors and reduces EMI fundamental frequency above AM band. |
| Input Voltage Range | 2.95 V to 5.5 V-directly interfaces 3.3 V and 5 V system buses without pre-regulation. |
| Feedback Reference | 0.8 V ±1.5%-sets output as low as 0.8 V with standard resistor divider; enables precise core voltage regulation. |
| Current Limit Threshold | 6.0 A typical-limits peak inductor current to protect internal FETs during overload or short-circuit events. |
| Efficiency | 96% peak at 1.0 MHz-minimizes thermal load in space-constrained embedded enclosures. |
| Thermal Resistance | 38 °C/W junction-to-ambient-requires PCB-exposed pad soldering for full 4 A performance at 125°C ambient. |
Pinout & Package
LM20154MH/NOPB uses a 16-pin HTSSOP package with exposed thermal pad (EP), optimized for thermal dissipation in high-current DC/DC applications. Pin layout follows TI's standard top-view numbering (1–16 + EP).
| 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-enables power sequencing in multi-voltage systems. |
| 2 FB | Feedback input | Connects to resistor divider from VOUT; internal 800 mV reference sets regulation point-defines output voltage accuracy and load regulation (0.08%/A). |
| 3 PGOOD | Power-good status | Open-drain output asserted high when VOUT within ±6% of target; requires 10–100 kΩ pull-up-signals host controller that rail is stable. |
| 4 COMP | Compensation node | Connects RC network to stabilize control loop; supports ceramic, polymer, or electrolytic output capacitors without redesign. |
| 5 NC | No-connect | Must be tied to AGND-ensures proper internal biasing and noise immunity. |
| 6,7 PVIN | Main power input | High-current VIN path for internal switches; requires local 22 µF X5R ceramic capacitor-minimizes input ripple and EMI. |
| 8,9 SW | Switch node | Drives external inductor; high dv/dt node requiring tight layout-connects directly to L and CIN ground return. |
| 10,11 PGND | Power ground | Return path for switch currents; separate from AGND to prevent noise coupling into error amplifier. |
| 12 EN | Enable input | 1.18 V threshold with 66 mV hysteresis-allows precise turn-on sequencing via resistor divider from PVIN. |
| 13 VCC | Internal sub-regulator | 2.7 V output for analog circuitry; bypassed with 1 µF ceramic-stabilizes internal bias independent of PVIN transients. |
| 14 AVIN | Analog supply input | Filtered PVIN input for internal analog blocks; requires RC low-pass filter-reduces switching noise injection into error amp. |
| 15 AGND | Analog ground | Quiet reference for FB, COMP, and error amplifier-must be isolated from PGND except at single-point star ground. |
| 16 SYNCOUT | Synchronization output | NMOS open-drain, 180° phase-shifted 1 MHz clock-enables interleaved operation with other sync-capable regulators to cut input capacitor RMS current. |
| EP | Exposed thermal pad | Internally weakly connected to GND; must be soldered to PCB ground plane-lowers θJA by >25% for sustained 4 A operation. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased start-up | Allows safe startup when output is already biased (e.g., via back-powering from another rail); prevents sinking current until soft-start ramp exceeds FB voltage-protects FPGA/ASIC I/O structures. |
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage-eliminates need for external compensation tuning across 0.8 V–3.3 V outputs and ensures stability in both CCM and DCM. |
| Diode emulation mode | Disables low-side FET at zero inductor current-reduces light-load switching losses and improves efficiency below 100 mA without audible noise. |
| Accurate current limit | ±10% tolerance over −40°C to +125°C-permits smaller inductors with lower saturation ratings, reducing board area and cost. |
| Integrated OVP & thermal shutdown | 108% VFB overvoltage trip and 160°C junction shutdown with 10°C hysteresis-provides autonomous fault containment without external monitoring circuitry. |
Applications
| FPGA Core Power Supply | DSP/ASIC Point-of-Load Regulation |
|---|---|
Use Scenario: Powers 0.85 V–1.2 V core rails of Xilinx Kintex or Intel Stratix FPGAs during configuration and high-speed data processing. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering up to 4 A with <1% load regulation and monotonic startup via SS/TRK pin. Use Value: Pre-biased start-up avoids reverse current through FPGA I/O clamps; PGOOD confirms rail readiness before configuration logic initiates. | Use Scenario: Supplies variable-core-voltage domains in TI C6000 DSPs or Broadcom ASICs where dynamic voltage scaling adjusts VDD based on workload. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with tracking capability-SS/TRK pin follows master 1.8 V rail to sequence 1.0 V I/O and 0.9 V core simultaneously. Use Value: 0.8 V reference and ±1.5% FB accuracy enable tight voltage margins required for sub-28 nm process nodes. |
| Optical Line Card Power | Industrial PLC I/O Module |
Use Scenario: Generates isolated 3.3 V and 1.2 V rails from a shared 5 V backplane in 10G/25G optical transponder modules. IC Role / Device Role / Timing Role: Dual-rail buck controller using SYNCOUT to interleave with companion LM20134-reducing input capacitor RMS current by ~30%. Use Value: 1 MHz switching and HTSSOP thermal pad allow dense placement near SFP+ cages without forced air cooling. | Use Scenario: Powers isolated CAN, RS-485, and analog sensor interface circuits in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Robust point-of-load regulator with UVLO (2.7 V), thermal shutdown (160°C), and 4 kV ESD-rated pins-survives industrial bus transients and wide ambient swings. Use Value: 96% peak efficiency minimizes heat buildup in sealed enclosures; PGOOD feeds watchdog timer for fail-safe reset initiation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM20144MH/NOPB | Same 4 A/1 MHz architecture but lacks SYNCOUT pin and pre-biased start-up support. | Not suitable for interleaved designs or FPGA rails with back-powering risk. | Select when SYNCOUT and tracking are unnecessary and BOM cost reduction is prioritized. |
| TPS544B20RNVR | 4 A, 1.5 MHz, integrated MOSFETs (2.5 mΩ/1.5 mΩ), PMBus interface, and adaptive on-time control. | Requires digital configuration; higher cost; supports telemetry and dynamic voltage scaling not available in LM20154MH/NOPB. | Select when telemetry, tighter output accuracy (<±0.5%), or faster transient response is required. |
Compared with LM20154MH/NOPB, LM20144MH/NOPB omits critical sequencing features for complex SoC power, while TPS544B20RNVR adds digital control overhead and cost-making LM20154MH/NOPB optimal for analog-controlled, cost-sensitive, high-reliability 1 MHz buck applications.
Availability
LM20154MH/NOPB is available at Aetrix Electronics and suitable for FPGA core power, DSP point-of-load regulation, and optical line card power conversion requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability (Q1 variant available).
Supply support for LM20154MH/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.
The LM20154MH/NOPB belongs to TI's high-current synchronous buck regulator product line, designed specifically for space-constrained, thermally demanding applications in communications infrastructure, industrial automation, and computing-where 4 A output, 1 MHz switching, and robust protection are essential.
FAQ
What is the recommended input capacitor for LM20154MH/NOPB?
A 22 µF X5R or X7R ceramic capacitor rated for ≥6.3 V is recommended and must be placed adjacent to PVIN and PGND pins. This value suppresses high-frequency switching ripple and meets RMS current requirements; additional capacitance may be needed if input traces are long or impedance is high. The LM20154MH/NOPB's input stage tolerates up to 5.5 V, so capacitor voltage rating must exceed worst-case bus overshoot.
Does LM20154MH/NOPB support output voltage tracking?
Yes, LM20154MH/NOPB supports voltage tracking via its SS/TRK pin: applying an external voltage ≤800 mV to this pin forces the output to follow that reference during startup. This enables coordinated sequencing with higher-voltage rails-critical in multi-supply systems like FPGAs where I/O voltage must ramp before core voltage. Tracking accuracy is ±15 mV relative to FB voltage.
Can LM20154MH/NOPB start up into a pre-biased output?
Yes, LM20154MH/NOPB supports pre-biased start-up: when the output is already at a non-zero voltage (e.g., from leakage or cross-coupling), the device will not sink current until its internal soft-start ramp exceeds the FB pin voltage. This prevents damaging reverse current flow through load parasitics-making LM20154MH/NOPB suitable for hot-swap and multi-rail FPGA/ASIC applications.
What is the purpose of the SYNCOUT pin on LM20154MH/NOPB?
The SYNCOUT pin on LM20154MH/NOPB provides an NMOS open-drain 1 MHz clock signal phase-shifted 180° from the high-side switch node. It enables interleaved operation with other sync-capable regulators (e.g., LM20134) to reduce input capacitor RMS current and conducted EMI. A 2.94 kΩ pull-up to PVIN is recommended for most implementations.
How does LM20154MH/NOPB handle overvoltage conditions?
LM20154MH/NOPB detects overvoltage via an internal comparator monitoring FB: if VOUT rises above 108% of the 0.8 V reference (i.e., >864 mV), it terminates the high-side pulse, turns on the low-side FET, and pulls PGOOD low. Recovery occurs only after FB falls back within regulation or zero-cross detection resets the FETs-providing autonomous fault containment without external circuitry.
LM20154MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerWise®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM20154MH/NOPB FAQ
1.How can I place an order for LM20154MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20154MH/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 LM20154MH/NOPB reliable?
The price and inventory of LM20154MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20154MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM20154MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20154MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20154MH/NOPB?
LM20154MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20154MH/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 LM20154MH/NOPB?
For technical support, including LM20154MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20154MH/NOPB requirements.
6.How does Aetrix verify that LM20154MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20154MH/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 LM20154MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM20154MH/NOPB?
All LM20154MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20154MH/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 LM20154MH/NOPB part is unused and in its original packaging.
Return procedure for LM20154MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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