My Inquiry
My Account
Texas Instruments LM20144MHX/NOPB
- Part No.:
- LM20144MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20144MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,168
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM20144MHX/NOPB from Texas Instruments is a 4A synchronous buck regulator with peak current mode control, adjustable switching frequency (500 kHz–1.5 MHz), 0.8V–5.5V output range, and integrated 32 mΩ/36 mΩ high-side/low-side FETs. It delivers stable point-of-load regulation for FPGA, DSP, and ASIC core supplies from 3.3V/5V input buses.
For engineers reviewing the LM20144MHX/NOPB datasheet, LM20144MHX/NOPB pinout, LM20144MHX/NOPB application, or LM20144MHX/NOPB equivalent, key selection criteria include pre-biased start-up capability, ±10 mV FB voltage accuracy, 6.0 A current limit tolerance, and HTSSOP-16 exposed-pad thermal performance in space-constrained industrial and telecom power designs.
Technical Context
The LM20144MHX/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 dual-stage current sensing includes blanking time (80 ns) and cycle-by-cycle limiting with foldback during hard shorts.
It integrates precision analog functions: 1.18V EN threshold with 66 mV hysteresis, 800 mV FB reference with ±12 mV total error over temperature, and PGOOD with 16 µs deglitching and 94% VFB rising threshold. The SS/TRK pin supports both programmable soft-start (via external capacitor) and voltage tracking of higher rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4 A continuous-supports FPGA core rails and multi-core SoC power domains without external current sharing. |
| Input Voltage Range | 2.95 V to 5.5 V-directly compatible with standard 3.3 V and 5 V system buses, eliminating intermediate regulation stages. |
| Switching Frequency | 500 kHz to 1.5 MHz-adjustable via RT-to-GND resistor; enables optimization of inductor size vs. EMI vs. light-load efficiency. |
| Feedback Reference | 0.8 V ±12 mV (−40°C to +125°C)-enables precise low-voltage outputs down to 0.8 V with minimal external resistor tolerance impact. |
| Current Limit Threshold | 6.0 A typical (5.4–6.6 A min/max)-tight tolerance reduces required inductor saturation margin and improves overcurrent response predictability. |
| High-Side RDS(on) | 36 mΩ max at 3.5 A-minimizes conduction loss at full load, supporting >97% peak efficiency at 1.2 V/4 A, 5 V input. |
| Thermal Shutdown | 160°C with 10°C hysteresis-protects against sustained overload or poor PCB thermal design while enabling safe auto-recovery. |
Pinout & Package
LM20144MHX/NOPB uses a 16-pin HTSSOP package with exposed thermal pad (Package Number PWP0016A). The exposed pad must be soldered to PCB ground plane to achieve θJA = 38°C/W and sustain 4 A continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-Start / Tracking Control | 5 µA internal current source charges external capacitor for monotonic startup; <0.8 V input forces output tracking of external rail. |
| 2 FB | Feedback Input | Connects to resistor divider from VOUT; 800 mV internal reference sets regulation point-accuracy directly determines output tolerance. |
| 3 PGOOD | Power Good Output | Open-drain signal asserting when VOUT is within ±6% of target; requires 10–100 kΩ pull-up for sequencing and fault monitoring. |
| 4 COMP | Compensation Node | External RC network sets loop crossover and phase margin-only two components needed for stable operation with ceramic output caps. |
| 6,7 PVIN | Power Switch Input | Dual pins reduce high-frequency input ripple current path impedance; must connect together near bulk input capacitor. |
| 8,9 SW | Switch Node | Drives external inductor; high di/dt node requiring tight layout and optional RC snubber if ringing exceeds EMI limits. |
| 10,11 PGND | Power Ground | Return path for switch currents; must be isolated from AGND except at single-point star ground to avoid noise coupling. |
| 12 EN | Enable Input | 1.18 V turn-on threshold with 66 mV hysteresis-allows precise input voltage sequencing using external resistor divider from PVIN. |
| 13 VCC | Internal Subregulator | 2.7 V bias supply; requires 1 µF ceramic bypass to PGND for stable gate drive and internal circuit operation. |
| 14 AVIN | Analog Supply Input | Bias source for error amplifier and references; must connect to PVIN through RC filter (R=10 Ω, C=1 µF) to suppress switching noise. |
| 15 AGND | Analog Ground | Quiet reference return for FB, COMP, and internal bias-must tie to PGND only at package EP or single-point ground. |
| 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 Pad | Thermal & Electrical Ground | Weak internal connection to GND; must be soldered to large PCB copper area for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased Start-up | Starts into existing VOUT without sinking current-prevents damage to FPGA/ASIC I/O banks during multi-rail power sequencing. |
| Nonlinear Slope Compensation | Parabolic ramp adapts to VOUT level-ensures stable current-mode control across full 0.8–5.5 V output range without manual compensation changes. |
| Diode Emulation Mode | Disables low-side FET at zero inductor current-eliminates reverse conduction losses and improves light-load efficiency below 100 mA. |
| Integrated OVP & UVLO | OVP triggers at 108% VFB with 3% hysteresis; UVLO activates at 2.7 V with 45 mV hysteresis-reduces need for external protection ICs. |
| Adjustable Soft-Start | External capacitor on SS/TRK sets ramp time (e.g., 10 nF → ~50 ms); prevents input bus droop and inrush stress on upstream converters. |
Applications
| FPGA Core Power | DSP/ASIC Point-of-Load |
|---|---|
|
Use Scenario: Powers Xilinx Artix-7 or Intel Cyclone V FPGA core logic at 1.0 V/3.5 A with tight transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated VCCINT with PGOOD sequencing to FPGA configuration controller. Use Value: Pre-biased start-up avoids back-driving configuration I/O; 6.0 A current limit accommodates FPGA dynamic current spikes without foldback. |
Use Scenario: Supplies TI C66x DSP or Broadcom BCM53xx ASIC at 1.2 V/4 A in optical line card with strict thermal limits. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter with thermal shutdown protecting against airflow failure in sealed chassis. Use Value: HTSSOP exposed pad enables 4 A operation at 70°C ambient without heatsink; 97% peak efficiency reduces board-level heat density. |
| Networking Processor Rail | Industrial MCU Core Supply |
|
Use Scenario: Generates 1.8 V/3 A for Marvell ARMADA XP networking processor in 1U switch with dense component layout. IC Role / Device Role / Timing Role: Adjustable-frequency buck regulator synchronized to system clock to minimize beat-frequency EMI in high-speed SerDes zones. Use Value: 500 kHz–1.5 MHz RT-programmable frequency allows EMI notch placement away from 2.5 Gbps lanes and DDR3 clocks. |
Use Scenario: Provides 3.3 V/2 A core supply for STMicro STM32H7 MCU in PLC controller with wide input voltage variation (3.3–5.5 V). IC Role / Device Role / Timing Role: Input-flexible buck regulator with precision enable pin enabling brown-out detection and controlled power-up sequence. Use Value: EN pin's 1.18 V threshold and 66 mV hysteresis allow direct connection to MCU GPIO or resistor-divider from unregulated 24 V input. |
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 | 4 A, 1.5 V to 16 V input, 0.6 V reference, integrated MOSFETs with lower RDS(on) (2.5 mΩ HS/1.5 mΩ LS) | Supports higher input voltages and lower output voltages; lacks pre-biased start-up and SS/TRK tracking | Preferred for 12 V input systems or sub-0.8 V outputs; not drop-in for LM20144MHX/NOPB's 3.3/5 V bus use case |
| MP2315GJ-Z | 4 A, 4.5–26 V input, 0.8 V reference, no SS/TRK pin, fixed 500 kHz frequency, smaller QFN-10 package | Higher input range but no tracking or programmable frequency; limited thermal performance at 4 A continuous | Suitable for cost-sensitive 12 V industrial supplies where tracking and frequency tuning are unnecessary |
Compared with TPS544B20RTWR and MP2315GJ-Z, the LM20144MHX/NOPB uniquely combines 2.95–5.5 V input compatibility, pre-biased start-up, voltage tracking, and 500 kHz–1.5 MHz adjustability-making it optimal for tightly sequenced, low-voltage, multi-rail embedded systems where board space and thermal management are constrained.
Availability
LM20144MHX/NOPB is available at Aetrix Electronics and suitable for FPGA core power, DSP point-of-load regulation, and industrial MCU supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM20144MHX/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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM20144MHX/NOPB belongs to TI's PowerWise® synchronous buck regulator family, designed specifically for high-efficiency, low-voltage point-of-load conversion in space-constrained digital systems such as FPGAs, DSPs, and networking processors.
FAQ
What is the minimum recommended output voltage for LM20144MHX/NOPB?
The LM20144MHX/NOPB supports an adjustable output voltage down to 0.8 V, set by the internal 800 mV feedback reference and external resistor divider. This minimum is guaranteed across temperature and load conditions, enabling direct powering of modern low-voltage FPGA and ASIC cores without additional regulation stages.
Does LM20144MHX/NOPB support start-up into a pre-biased output?
Yes, the LM20144MHX/NOPB supports pre-biased start-up: it will not sink current from a pre-charged output until the internal soft-start ramp exceeds the FB pin voltage. This protects downstream loads like FPGA I/O banks from reverse current during multi-rail power sequencing, a critical feature in telecom and networking equipment.
How is switching frequency set on LM20144MHX/NOPB?
Switching frequency on the LM20144MHX/NOPB is set by connecting an external resistor from the RT pin to ground. A 49.9 kΩ resistor yields ~1.5 MHz, while 249 kΩ yields ~500 kHz. The relationship is approximately fSW = 154750 / RRT − 55 kHz, allowing precise EMI management and inductor size optimization.
What thermal performance can be expected from LM20144MHX/NOPB in the HTSSOP package?
In the HTSSOP-16 package with exposed pad soldered to a 4-layer PCB thermal pad, the LM20144MHX/NOPB achieves θJA = 38°C/W. At 4 A load and 5 V input, junction temperature rise is ~152°C above ambient-requiring derating above 70°C ambient or enhanced copper pour to maintain reliability within the 125°C max operating junction temperature.
Can LM20144MHX/NOPB track another voltage rail during start-up?
Yes, the SS/TRK pin enables output voltage tracking: when driven by an external voltage less than 0.8 V, the LM20144MHX/NOPB regulates its output to match that reference. This allows coordinated ramp-up with higher-voltage rails (e.g., I/O supply before core supply), preventing latch-up in mixed-voltage digital ICs.
LM20144MHX/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20144MHX/NOPB FAQ
1.How can I place an order for LM20144MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20144MHX/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 LM20144MHX/NOPB reliable?
The price and inventory of LM20144MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20144MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM20144MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20144MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20144MHX/NOPB?
LM20144MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20144MHX/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 LM20144MHX/NOPB?
For technical support, including LM20144MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20144MHX/NOPB requirements.
6.How does Aetrix verify that LM20144MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20144MHX/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 LM20144MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM20144MHX/NOPB?
All LM20144MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20144MHX/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 LM20144MHX/NOPB part is unused and in its original packaging.
Return procedure for LM20144MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM20144MHX/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
