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Texas Instruments LM20144QMHX/NOPB
- Part No.:
- LM20144QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20144QMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,745
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Product details
Overview
LM20144QMHX/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified 4A synchronous buck regulator with peak current mode control, adjustable switching frequency (500 kHz–1.5 MHz), 0.8V adjustable output voltage, and integrated 32 mΩ/36 mΩ high-side/low-side FETs. It delivers up to 4A continuous output from a 2.95V–5.5V input, supports pre-biased start-up, and is used in FPGA/DSP power rails requiring tight regulation and sequencing.
For engineers reviewing the LM20144QMHX/NOPB datasheet, LM20144QMHX/NOPB pinout, LM20144QMHX/NOPB application, or LM20144QMHX/NOPB equivalent, key selection criteria include its HTSSOP-16 exposed-pad thermal performance, precision enable threshold (1.18V typ), PGOOD open-drain signaling, and SS/TRK dual-mode tracking/soft-start capability for multi-rail coordination.
Technical Context
The LM20144QMHX/NOPB implements peak current mode control with nonlinear parabolic slope compensation-dynamically adjusted per output voltage-to ensure stability across 0.8V–5.5V VOUT without external loop tuning complexity. Its internal 2.7V sub-regulator (VCC) powers bias circuitry, while AVIN/AGND provide isolated analog supply and quiet ground for error amplifier (gm = 510 µmho, AVOL = 2000 V/V) and modulator accuracy.
It integrates OVP (108% of VFB), UVLO (2.7V rising, 45 mV hysteresis), thermal shutdown (160°C), and cycle-by-cycle current limiting (6.0A typ at 3.3V). The SS/TRK pin enables monotonic soft-start via external capacitor or precise voltage tracking using external resistor dividers-critical for coordinated power-up in multi-rail systems like telecom baseband processors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports high-current FPGA core rails without external FETs or heatsinks. |
| Input Voltage Range | 2.95V to 5.5V - compatible with standard 3.3V and 5V system buses. |
| Switching Frequency | 500 kHz to 1.5 MHz - adjustable via RT-to-ground resistor; enables compact magnetics and EMI optimization. |
| Feedback Reference | 0.8V ±1.5% - sets regulated output via RFB1/RFB2 divider; enables low-voltage core supplies (e.g., 1.2V, 1.0V). |
| Current Limit Threshold | 6.0A typical at VIN = 3.3V - ensures robust short-circuit protection while allowing margin for inductor saturation. |
| Peak Efficiency | 97% - achieved at mid-load with 5V input → 1.2V/4A output, reducing thermal load in dense PCB layouts. |
| Thermal Resistance θJA | 38°C/W - measured on JEDEC 4-layer board with 8 thermal vias; enabled by exposed pad soldered to PCB ground plane. |
Pinout & Package
LM20144QMHX/NOPB uses a 16-pin HTSSOP package (Package Number PWP0016A) with exposed thermal pad (EP) on bottom, designed for direct soldering to PCB ground plane to achieve θJA = 38°C/W and support 4A operation without external heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-Start / Tracking Control | 5 µA internal current source charges external capacitor for controlled ramp; <0.8V input overrides FB reference for rail tracking. |
| 2 FB | Feedback Input | Connects to resistor divider from VOUT; regulates output to 0.8V at this pin - defines output voltage setpoint. |
| 3 PGOOD | Power-Good Open-Drain Output | Asserts low when VOUT is within ±6% of target (94–96% of VFB); requires 10–100 kΩ pull-up for system sequencing. |
| 4 COMP | Compensation Node | External RC network sets loop crossover and phase margin; supports ceramic, polymer, or electrolytic output capacitors. |
| 5 NC | No Connect | Internally unconnected; TI recommends tying to AGND for noise immunity. |
| 6,7 PVIN | Power Switch Input | High-current input pins tied together near device; require low-ESR bulk + ceramic input capacitance (e.g., 22 µF X5R + 1 µF). |
| 8,9 SW | Switch Node | Drives external inductor; high dV/dt node requiring minimized trace area and optional RC snubber for EMI control. |
| 10,11 PGND | Power Ground | Return path for high-current switch loops; must be separated from AGND and joined only at single point near EP. |
| 12 EN | Enable Input | 1.18V typical turn-on threshold with 66 mV hysteresis; supports precise input-voltage sequencing via resistor divider from PVIN. |
| 13 VCC | Internal Sub-Regulator Output | 2.7V supply for internal logic; bypassed with 1 µF ceramic capacitor to stabilize gate drive and control circuitry. |
| 14 AVIN | Analog Supply Input | Filtered input (RC low-pass) for internal bias generation; must connect to PVIN through series R and shunt C. |
| 15 AGND | Analog Ground | Quiet reference for error amplifier and modulator; isolated from PGND except at EP or designated star point. |
| 16 RT | Frequency Set | Resistor to GND sets oscillator frequency: 49.9 kΩ → 1.5 MHz, 249 kΩ → 500 kHz - enables EMI spread-spectrum tuning. |
| EP | Exposed Thermal Pad | Weakly connected to GND internally; must be soldered to large PCB ground plane for thermal dissipation and θJA reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased Start-Up | Enables safe power-up into existing VOUT > 0V (e.g., FPGA I/O rails); prevents reverse current flow during soft-start ramp. |
| Nonlinear Slope Compensation | Parabolic ramp adapts to VOUT level - eliminates need for manual slope adjustment and guarantees stability across full 0.8V–5.5V range. |
| Diode Emulation Mode | Disables low-side FET at zero inductor current - avoids reverse conduction and improves light-load efficiency below ~100 mA. |
| Integrated OVP + UVP + Thermal Shutdown | Hardware-level fault protection triggers immediate FET tri-state and PGOOD deassertion - no firmware or external monitoring required. |
| Adjustable Soft-Start & Tracking | Single SS/TRK pin supports either monotonic voltage ramp (via CSS) or synchronized ramp with higher-voltage rail (via resistor network). |
Applications
| Telecom Baseband Processor Power | FPGA Core Voltage Regulation |
|---|---|
|
Use Scenario: Powering multi-core baseband processors in 4G/LTE small cells where strict sequencing and low-noise 1.0V/1.2V rails are required. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 4A at 1.0V from 3.3V bus; coordinates start-up with RF transceiver via SS/TRK tracking. Use Value: Pre-biased start-up prevents back-driving of partially powered RF sections; PGOOD enables deterministic boot timing. |
Use Scenario: Generating configurable core voltage for Xilinx Artix-7 or Intel Cyclone V FPGAs in industrial PLCs. IC Role / Device Role / Timing Role: Adjustable-frequency buck converter with 0.8V reference supporting dynamic VDD scaling; EN pin enables firmware-controlled power gating. Use Value: 97% peak efficiency reduces board-level heat density; HTSSOP exposed pad eliminates need for thermal vias under IC. |
| Automotive ADAS Camera Module | Networking ASIC Supply |
|
Use Scenario: Providing AEC-Q100-compliant 1.8V/2.5V rails for image signal processors in rear-view camera ECUs operating at −40°C to +125°C. IC Role / Device Role / Timing Role: Grade 1 qualified buck regulator with UVLO hysteresis (45 mV) and thermal shutdown (160°C) for automotive ambient resilience. Use Value: Integrated OVP (108% of VFB) protects sensitive ISP cores from transient overvoltage; SS/TRK ensures monotonic startup during cold crank. |
Use Scenario: Stepping down 5V mid-rail to 1.2V for Broadcom BCM56xx switch ASICs in enterprise switches with strict ripple limits (<10 mV). IC Role / Device Role / Timing Role: High-frequency (1.2 MHz) buck regulator using ceramic output caps; COMP pin allows fine-tuning for <20 µs load transient recovery. Use Value: 500 kHz–1.5 MHz frequency adjust enables EMI compliance in dense switch fabric; 32 mΩ/36 mΩ FETs minimize conduction loss at 4A. |
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, 4.5–18V input, 600 kHz–2 MHz freq, 0.6V ref, QFN-17 with PowerPAD; higher Vin range but larger footprint. | Targets 12V intermediate bus systems; lacks AEC-Q100 qualification and pre-bias start-up. | Select for wider input range and higher-frequency operation where automotive qualification is not required. |
| MP2315DJ-LF-Z | 4A, 4.5–26V input, fixed 500 kHz, 0.8V ref, SOIC-8; lower integration (no SS/TRK, no PGOOD), no AEC-Q100. | Suitable for cost-sensitive industrial 24V DC inputs; no rail tracking or precision enable. | Choose for simpler, lower-cost 24V-to-3.3V conversion where sequencing and automotive compliance are unnecessary. |
Compared with TPS544B20RTWR and MP2315DJ-LF-Z, LM20144QMHX/NOPB uniquely combines AEC-Q100 Grade 1 qualification, pre-biased start-up, SS/TRK dual-mode functionality, and HTSSOP thermal performance in a 2.95–5.5V input range - making it optimal for space-constrained, multi-rail automotive and telecom applications requiring deterministic sequencing and reliability.
Availability
LM20144QMHX/NOPB is available at Aetrix Electronics and suitable for FPGA power delivery, automotive ADAS modules, telecom baseband processors, and networking ASIC supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LM20144QMHX/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 LM20144 product line delivers fully integrated, AEC-Q100-qualified synchronous buck regulators optimized for low-voltage, high-current point-of-load applications in automotive, telecom, and industrial systems where thermal efficiency, sequencing control, and fault resilience are critical.
FAQ
What is the maximum continuous output current supported by the LM20144QMHX/NOPB?
The LM20144QMHX/NOPB supports 4A of continuous output current under thermal design conditions meeting θJA ≤ 38°C/W (JEDEC 4-layer board with 8 thermal vias and exposed pad soldered to ground plane). At ambient temperatures above 60°C or with reduced copper area, derating applies per the thermal curves in the SNVS529G datasheet. Peak current limit is 6.0A typical at 3.3V input, providing headroom for transient loads without foldback.
Does the LM20144QMHX/NOPB support start-up into a pre-biased output voltage?
Yes, the LM20144QMHX/NOPB supports pre-biased start-up: when VOUT is non-zero at power-on, the device will not sink current from the output until the internal soft-start ramp exceeds the FB pin voltage. This prevents reverse current flow through parasitic paths in multi-rail systems such as FPGA or DSP boards, protecting downstream components. No external diode or circuitry is needed - the behavior is inherent to the control architecture.
How is the switching frequency set on the LM20144QMHX/NOPB?
The switching frequency of the LM20144QMHX/NOPB is set by connecting a resistor between the RT pin and ground. The relationship is approximately RT = 154.75 kΩ / fSW – 55 kΩ, yielding 500 kHz at 249 kΩ and 1.5 MHz at 49.9 kΩ. The oscillator tolerances are ±10% over temperature and line, and frequency remains stable across input voltage and load variations - enabling predictable EMI filter design and layout.
What is the function of the SS/TRK pin on the LM20144QMHX/NOPB?
The SS/TRK pin on the LM20144QMHX/NOPB serves two distinct functions: (1) Soft-Start - when connected to a capacitor to ground, it generates a linear 5 µA-charged ramp controlling output voltage rise time; (2) Tracking - when driven by an external voltage <0.8V, it forces the FB node to follow that reference, enabling coordinated ramp-up with higher-voltage rails. Both modes are mutually exclusive and selected by external circuitry - no configuration register or command is required.
Is the LM20144QMHX/NOPB qualified for automotive applications?
Yes, the LM20144QMHX/NOPB is explicitly qualified to AEC-Q100 Grade 1 (−40°C to +125°C junction temperature), with built-in features supporting automotive reliability: UVLO with 45 mV hysteresis, thermal shutdown at 160°C with 10°C hysteresis, OVP at 108% of VFB, and HTSSOP packaging with exposed pad for robust thermal performance. The "Q" suffix denotes automotive qualification, and the device is listed in TI's automotive-grade product portfolio with PPAP documentation support.
LM20144QMHX/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:
- 500kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20144QMHX/NOPB FAQ
1.How can I place an order for LM20144QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20144QMHX/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 LM20144QMHX/NOPB reliable?
The price and inventory of LM20144QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20144QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM20144QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20144QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20144QMHX/NOPB?
LM20144QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20144QMHX/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 LM20144QMHX/NOPB?
For technical support, including LM20144QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20144QMHX/NOPB requirements.
6.How does Aetrix verify that LM20144QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20144QMHX/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 LM20144QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM20144QMHX/NOPB?
All LM20144QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20144QMHX/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 LM20144QMHX/NOPB part is unused and in its original packaging.
Return procedure for LM20144QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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