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Texas Instruments LM20145QMH/NOPB
- Part No.:
- LM20145QMH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20145QMH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
LM20145QMH/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous buck regulator delivering up to 5A continuous output current, operating from 2.95V–5.5V input, with adjustable switching frequency (250–750 kHz), integrated 32 mΩ high-side/36 mΩ low-side FETs, and precision 0.8V feedback reference for low-voltage point-of-load regulation in automotive and industrial power systems.
For engineers reviewing the LM20145QMH/NOPB datasheet, LM20145QMH/NOPB pinout, LM20145QMH/NOPB application, or LM20145QMH/NOPB equivalent, key selection considerations include its peak-current-mode control architecture, pre-biased startup capability, PGOOD open-drain signaling, RT-pin-based frequency programming, and HTSSOP-16 exposed-pad thermal performance under sustained 5A loads.
Technical Context
The LM20145QMH/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 ramp injection. Its transconductance error amplifier (Gm = 510 µmho) interfaces directly with the COMP pin for two-component Type II compensation.
It integrates dual N-channel MOSFETs (RDS_ON ≤ 55 mΩ HS / ≤ 52 mΩ LS), precision enable (VIH_EN = 1.18V typ, 66 mV hysteresis), UVLO (2.7V rising threshold), OVP (108% of VFB), and thermal shutdown (160°C). The SS/TRK pin supports both soft-start timing (via external capacitor) and voltage tracking of higher rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5A continuous-supports FPGA core rails and multi-core DSPs without external current sharing. |
| Input Voltage Range | 2.95V to 5.5V-directly compatible with 3.3V and 5V system buses, including automotive 5V supplies. |
| Switching Frequency | 250 kHz to 750 kHz-set via RT-to-GND resistor; enables optimization of inductor size vs. efficiency trade-off. |
| Feedback Reference | 0.8V ±1.5%-enables precise low-VOUT regulation down to 0.8V with standard resistor dividers. |
| Current Limit Threshold | 7.4A typical-minimizes required inductor saturation current rating while maintaining robust short-circuit protection. |
| Peak Efficiency | 97% at 5V→1.2V/3A-achieved using integrated low-RDS_ON FETs and diode emulation mode at light load. |
| Thermal Resistance | θJA = 38°C/W on JEDEC 4-layer board-exposed pad enables direct PCB thermal coupling without heatsink. |
Pinout & Package
LM20145QMH/NOPB uses a 16-pin HTSSOP package (Package Number PWP0016A) with exposed thermal pad (EP) soldered to PCB ground plane for enhanced heat dissipation. Pin pitch is 0.65 mm; body dimensions are 5.0 mm × 4.4 mm × 1.2 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-Start or Tracking Control | 5 µA internal current source charges external capacitor for monotonic startup; <0.8V input forces output tracking of external rail. |
| 2 FB | Feedback Input | Connects to resistor divider; regulates output by comparing against internal 0.8V reference. |
| 3 PGOOD | Power Good Output | Open-drain signal asserted when VOUT is within ±6% of target; requires 10–100 kΩ pull-up. |
| 4 COMP | Compensation Node | Interface for Type II network (RC + series R); sets loop crossover and phase margin. |
| 5 NC | No Connect | Internally unconnected; must be tied to AGND or PVIN for noise immunity. |
| 6,7 PVIN | Power Switch Input | Dual input pins for high-current path; require local low-ESR ceramic input capacitance. |
| 8,9 SW | Switch Node | Drives external inductor; high dv/dt node requiring tight layout and optional snubber. |
| 10,11 PGND | Power Ground | Return path for switch currents; separate from AGND to minimize noise coupling. |
| 12 EN | Enable Input | 1.18V turn-on threshold with 66 mV hysteresis; supports precise sequencing via resistor divider. |
| 13 VCC | Internal Subregulator Output | 2.7V supply for bias circuitry; bypass with 1 µF ceramic capacitor near pin. |
| 14 AVIN | Analog Supply Input | Filtered input for analog circuits; connect to VIN via RC filter (e.g., 10 Ω + 1 µF). |
| 15 AGND | Analog Ground | Quiet reference for error amplifier and modulator; tie to PGND at single point only. |
| 16 RT | Frequency Set | Resistor to GND sets oscillator frequency: RT = 78 kΩ/(fSW – 55 kHz) for fSW in kHz. |
| EP | Exposed Pad | Thermally conductive ground connection; must be soldered to large PCB copper area for θJA reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Peak-Current-Mode Control with Nonlinear Slope Compensation | Parabolic ramp adapts to VOUT-ensures stable operation across full 0.8V–5.5V range without external slope injection. |
| Pre-Biased Startup Capability | Does not sink current during startup if VOUT > 0-prevents damage to FPGA/ASIC loads with parasitic conduction paths. |
| Adjustable Soft-Start & Output Tracking | Single SS/TRK pin supports either 1 ms internal ramp or external capacitor timing; also enables rail sequencing with master supply. |
| Diode Emulation Mode | Disables low-side FET at zero inductor current-eliminates reverse current, improves light-load efficiency below 100 mA. |
| AEC-Q100 Grade 1 Qualification | Rated for −40°C to +125°C junction temperature-validated for automotive infotainment, ADAS, and body electronics. |
Applications
| Automotive Infotainment Power | FPGA Core Rail Regulation |
|---|---|
Use Scenario: Supplies 1.2V core voltage to SoC in head-unit with 5V battery-derived input and strict thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing transient response, sequencing, and fault reporting via PGOOD. Use Value: Pre-biased startup prevents latch-up during hot-swap of display modules; AEC-Q100 qualification ensures reliability over vehicle lifetime. |
Use Scenario: Powers Xilinx Artix-7 FPGA core from 3.3V bus in industrial PLC with tight output tolerance and fast load steps. IC Role / Device Role / Timing Role: Point-of-load regulator with tracking capability to coordinate with auxiliary 2.5V I/O rail during configuration. Use Value: 97% peak efficiency reduces thermal load on dense PCB; SS/TRK pin enables monotonic startup critical for FPGA configuration integrity. |
| Networking ASIC Bias Supply | Industrial DSP Power Management |
Use Scenario: Generates 1.0V supply for Broadcom BCM56xx switch ASIC in 1RU switch chassis with limited airflow. IC Role / Device Role / Timing Role: High-current buck converter with programmable frequency to avoid noise coupling into SerDes lanes. Use Value: 750 kHz max switching enables compact 1.0 µH inductor; exposed pad design meets 38°C/W thermal requirement without heatsink. |
Use Scenario: Delivers 1.8V to TI C66x DSP in motor drive controller where EMI and thermal management are critical. IC Role / Device Role / Timing Role: Regulator with precision enable and UVLO for controlled power-up sequence alongside gate driver ICs. Use Value: 66 mV EN hysteresis prevents oscillation during brown-out; integrated OVP protects sensitive DSP core from overvoltage faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54560QPWPRQ1 | Wider input range (3.5V–60V), lower output current (5A max), no pre-bias startup, fixed 500 kHz frequency. | Suitable for 12V/24V automotive systems but lacks LM20145QMH/NOPB's 3.3V/5V bus compatibility and tracking capability. | Choose for high-input-voltage DC/DC conversion where LM20145QMH/NOPB's 2.95V–5.5V range is insufficient. |
| MP2315GJ-Z | Non-AEC-Q100, 5A rating, 2.5V–36V input, no SS/TRK pin, no PGOOD, smaller QFN-10 package. | Targeted at cost-sensitive industrial applications; lacks automotive qualification, rail tracking, and power-good signaling. | Choose for non-automotive designs where footprint and BOM cost outweigh need for sequencing and fault reporting. |
Compared with TPS54560QPWPRQ1 and MP2315GJ-Z, the LM20145QMH/NOPB uniquely combines AEC-Q100 Grade 1 qualification, pre-biased startup, output voltage tracking, and PGOOD signaling in a 5A buck regulator optimized for 3.3V/5V bus architectures-making it the preferred choice for automotive and high-reliability embedded power rails.
Availability
LM20145QMH/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, FPGA core power delivery, and industrial DSP biasing requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LM20145QMH/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 automotive-grade product development and manufacturing excellence.
The LM20145QMH/NOPB belongs to TI's PowerWise® family of high-efficiency DC/DC regulators, designed specifically for low-voltage, high-current point-of-load applications in automotive, industrial, and communications infrastructure where thermal performance and reliability are critical.
FAQ
What is the maximum output current supported by the LM20145QMH/NOPB?
The LM20145QMH/NOPB delivers up to 5A of continuous output current under thermal limits defined by its HTSSOP-16 exposed-pad package and PCB layout. Peak current limit is specified at 7.4A typical, enabling robust short-circuit handling. Actual achievable current depends on ambient temperature, input/output voltage, switching frequency, and thermal design-TI recommends verifying junction temperature remains below 125°C in final application.
Does the LM20145QMH/NOPB support startup into a pre-biased output?
Yes, the LM20145QMH/NOPB supports pre-biased startup: when VOUT > 0 at enable, it will not sink current until the internal soft-start ramp exceeds the FB pin voltage. This prevents reverse current flow through load parasitics-critical for FPGA, ASIC, and multi-rail systems. The SS/TRK pin must be left floating or configured for internal soft-start (1 ms) to activate this behavior.
How is switching frequency set on the LM20145QMH/NOPB?
Switching frequency on the LM20145QMH/NOPB is set by connecting a resistor (RT) between the RT pin and ground. Frequency ranges from 250 kHz to 750 kHz and follows RT = 78 kΩ/(fSW – 55 kHz), where fSW is in kHz. For example, a 49.9 kΩ resistor yields ~750 kHz. No external capacitor is needed-frequency is internally generated and temperature-compensated.
What is the purpose of the SS/TRK pin on the LM20145QMH/NOPB?
The SS/TRK pin on the LM20145QMH/NOPB serves dual functions: (1) Soft-Start-connect external capacitor to ground to program monotonic output ramp time; (2) Voltage Tracking-drive with external voltage <0.8V to force LM20145QMH/NOPB output to follow that rail. Leaving SS/TRK open activates internal 1 ms soft-start. Both modes prevent inrush current and enable coordinated power sequencing.
Is the LM20145QMH/NOPB qualified for automotive applications?
Yes, the LM20145QMH/NOPB is explicitly qualified to AEC-Q100 Grade 1 standards (−40°C to +125°C junction temperature), with production testing and reliability validation for automotive use. It includes automotive-specific features: precision enable with hysteresis, UVLO with glitch immunity, thermal shutdown with 10°C hysteresis, and PGOOD signaling-all documented in TI's SNVS530E datasheet.
LM20145QMH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerWise®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 5A
- Frequency - Switching:
- 260kHz ~ 750kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20145QMH/NOPB FAQ
1.How can I place an order for LM20145QMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20145QMH/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 LM20145QMH/NOPB reliable?
The price and inventory of LM20145QMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20145QMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM20145QMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20145QMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20145QMH/NOPB?
LM20145QMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20145QMH/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 LM20145QMH/NOPB?
For technical support, including LM20145QMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20145QMH/NOPB requirements.
6.How does Aetrix verify that LM20145QMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20145QMH/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 LM20145QMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM20145QMH/NOPB?
All LM20145QMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20145QMH/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 LM20145QMH/NOPB part is unused and in its original packaging.
Return procedure for LM20145QMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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