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Texas Instruments LM20145QMHX/NOPB
- Part No.:
- LM20145QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20145QMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,009
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Product details
Overview
LM20145QMHX/NOPB from Texas Instruments is a 5A synchronous buck regulator with peak current mode control, adjustable switching frequency (250–750 kHz), integrated 32 mΩ high-side and 32 mΩ low-side FETs, and precision 0.8V feedback reference-designed for point-of-load regulation in FPGA, DSP, and ASIC power rails supplied from 3.3V or 5V buses.
For engineers reviewing the LM20145QMHX/NOPB datasheet, LM20145QMHX/NOPB pinout, LM20145QMHX/NOPB application, or LM20145QMHX/NOPB equivalent, key selection considerations include pre-biased start-up capability, output voltage tracking via SS/TRK pin, ±10 mV FB accuracy over temperature, and AEC-Q100 Grade 1 qualification for automotive-adjacent industrial systems.
Technical Context
The LM20145QMHX/NOPB implements nonlinear parabolic slope compensation to maintain stability across 0.8V–5.5V output ranges without external tuning. Its peak current mode architecture supports cycle-by-cycle current limiting, inherent line feed-forward, and stable operation with ceramic, polymer, or hybrid output capacitors.
It integrates dual MOSFET drivers, a 2.7V internal sub-regulator (VCC), analog bias supply filtering (AVIN/AGND), and fault protection including OVP (108% VFB), thermal shutdown (160°C), and UVLO (2.7V with 45 mV hysteresis). The SS/TRK pin enables either soft-start ramp control or monotonic voltage tracking of higher-voltage rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5A continuous-supports high-current digital loads without external current sharing. |
| Input Voltage Range | 2.95V to 5.5V-directly compatible with standard 3.3V and 5V system buses. |
| Feedback Reference | 0.8V ±12 mV (−40°C to +125°C)-enables accurate low-voltage regulation down to 0.8V with minimal resistor tolerance impact. |
| Switching Frequency | 250 kHz to 750 kHz via RT resistor-allows optimization of inductor size vs. efficiency and EMI performance. |
| FET RDS(on) | 32 mΩ high-side / 32 mΩ low-side at 3.5A-minimizes conduction loss and thermal rise at full load. |
| Current Limit Threshold | 7.4A typical (−40°C to +125°C)-provides robust short-circuit protection while enabling smaller inductors. |
| Efficiency | 97% peak at 5V→1.2V/3A-reduces thermal management burden in dense PCB layouts. |
Pinout & Package
LM20145QMHX/NOPB uses a 16-pin HTSSOP package with exposed thermal pad (Package Number PWP0016A), optimized for PCB-level heat dissipation without heatsinks. The exposed pad must be soldered to a solid ground plane to achieve θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start or tracking control | 5 µA internal current source charges external capacitor for programmable startup ramp; also accepts external voltage for rail tracking. |
| 2 FB | Feedback input | Connects to resistor divider; regulates output to 0.8V reference-accuracy directly determines output voltage tolerance. |
| 3 PGOOD | Open-drain power-good indicator | Asserts low when VOUT is within ±6% of target; requires 10–100 kΩ pull-up for system sequencing. |
| 4 COMP | Compensation node | External RC network sets loop bandwidth and phase margin-only two components needed for stable operation. |
| 5 NC | No connect | Must be tied to AGND per TI recommendation to reduce noise coupling. |
| 6,7 PVIN | Power switch input | Dual pins reduce trace inductance; require local low-ESR input capacitor (e.g., 22 µF X5R) placed adjacent to pins. |
| 8,9 SW | Switch node | High-frequency PWM output driving external inductor; layout critical to minimize EMI and ringing. |
| 10,11 PGND | Power ground return | Separate from AGND; must be connected to low-impedance ground plane under exposed pad. |
| 12 EN | Enable with hysteresis | Turn-on threshold 1.18V ±66 mV-supports precise input-voltage sequencing via resistor divider from PVIN. |
| 13 VCC | Internal 2.7V regulator output | Bypass with 1 µF ceramic capacitor; powers gate drivers and internal logic-decoupling prevents instability. |
| 14 AVIN | Analog supply input | Must be filtered from PVIN via RC network (e.g., 10 Ω + 1 µF) to suppress noise on bias circuitry. |
| 15 AGND | Analog ground reference | Quiet ground for error amplifier and reference-must be star-connected to PGND at single point near IC. |
| 16 RT | Frequency set resistor | Resistor to GND sets fSW: 49.9 kΩ → 750 kHz, 249 kΩ → 260 kHz-enables EMI spread-spectrum tuning. |
| EP | Exposed thermal pad | Electrically connected to GND; mandatory solder connection to PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased start-up | Starts into existing output voltage without sinking current-prevents damage to FPGA/ASIC I/O during multi-rail power sequencing. |
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage-ensures stable current-mode control across full 0.8V–5.5V range without manual tuning. |
| Diode emulation mode | Disables reverse current at light load-eliminates negative inductor current and improves efficiency below ~100 mA. |
| AEC-Q100 Grade 1 | Qualified for −40°C to +125°C junction operation-validates reliability for automotive infotainment, ADAS sensor hubs, and industrial controllers. |
| Integrated OVP/UVLO/thermal shutdown | Single-chip protection eliminates need for external supervisors-reduces BOM count and board space in safety-critical designs. |
Applications
| Baseband Processor Power | FPGA Core Rail |
|---|---|
|
Use Scenario: Powering ARM-based baseband processors in 4G/LTE small cells requiring tight voltage tolerance and fast transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.0V @ 4A with <1% load regulation and <100 µs recovery from 2A load step. Use Value: 97% peak efficiency reduces thermal load in sealed enclosures; PGOOD enables safe processor reset sequencing. |
Use Scenario: Generating configurable core voltage (0.85V–1.2V) for Xilinx Artix-7 FPGAs in reconfigurable edge computing nodes. IC Role / Device Role / Timing Role: Adjustable-output buck converter with SS/TRK pin tracking auxiliary 3.3V rail during power-up to prevent I/O contention. Use Value: Pre-biased start-up avoids FPGA configuration corruption; ±12 mV FB accuracy ensures reliable bitstream loading. |
| Automotive Infotainment SoC | Optical Transceiver Bias |
|
Use Scenario: Supplying 1.1V core power to NXP i.MX8M SoCs in dashboard displays operating across automotive temperature range. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 buck regulator with thermal shutdown and UVLO-monitors input bus integrity and junction temperature autonomously. Use Value: 160°C thermal shutdown prevents latch-up during prolonged high-ambient conditions; EN pin hysteresis rejects ignition noise. |
Use Scenario: Providing stable 2.5V bias to SFP+ optical transceivers in enterprise switches where EMI-sensitive analog circuits coexist with digital logic. IC Role / Device Role / Timing Role: Low-noise synchronous buck with separate AGND/PGND and AVIN filtering-minimizes switching noise coupling into laser driver paths. Use Value: Dual ground planes and analog supply filtering reduce output ripple to <5 mVpp, preventing bit-error-rate degradation. |
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 (3.5–60V), lower output current (5A max), no pre-bias start-up | Better suited for 12V/24V industrial inputs; lacks SS/TRK tracking and pre-bias capability required for FPGA sequencing | Select when input exceeds 5.5V or automotive 12V battery direct connection is needed; not drop-in for 3.3V/5V bus designs. |
| MP2315GJ-Z | Higher current (6A), smaller QFN-10 package, no AEC-Q100 qualification, fixed 500 kHz fSW | Lacks adjustable frequency, tracking, and automotive qualification-limited to commercial-grade consumer electronics | Choose for cost-sensitive, space-constrained applications where AEC-Q100 and rail tracking are unnecessary. |
Compared with TPS54560QPWPRQ1 and MP2315GJ-Z, LM20145QMHX/NOPB uniquely combines AEC-Q100 Grade 1 rating, pre-biased start-up, and SS/TRK voltage tracking-making it the only option qualified for automotive-adjacent FPGA and SoC core rail applications requiring strict power sequencing and reliability.
Availability
LM20145QMHX/NOPB is available at Aetrix Electronics and suitable for FPGA power delivery, automotive infotainment SoC supplies, and optical transceiver biasing requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM20145QMHX/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-reliability power conversion solutions.
The LM20145QMHX/NOPB belongs to TI's PowerWise® synchronous buck regulator family, engineered specifically for high-efficiency, low-voltage point-of-load regulation in automotive, industrial, and communications infrastructure applications.
FAQ
What is the maximum junction temperature and thermal shutdown behavior of the LM20145QMHX/NOPB?
The LM20145QMHX/NOPB features internal thermal shutdown triggered at 160°C (typical) junction temperature. When activated, it tri-states both power FETs and resets the soft-start circuit. Recovery occurs automatically once the junction cools to approximately 150°C, after which the device resumes normal startup sequencing. This hysteresis prevents thermal cycling during sustained elevated ambient conditions.
Can the LM20145QMHX/NOPB start up into a pre-biased output, and how does it behave during that condition?
Yes, the LM20145QMHX/NOPB supports pre-biased start-up. When the output voltage is non-zero at enable, the device will not sink current from the rail-even though it uses synchronous rectification. It waits until the internal soft-start ramp exceeds the voltage present at the FB pin before initiating switching, thereby protecting downstream loads like FPGAs from reverse current damage during multi-rail power sequencing.
What is the purpose of the AVIN and AGND pins on the LM20145QMHX/NOPB, and how should they be routed?
The AVIN pin supplies clean bias voltage to the internal analog circuitry and must be filtered from PVIN using an RC network (e.g., 10 Ω + 1 µF ceramic). AGND is the quiet ground reference for the error amplifier and reference-physically separate from PGND. Both pins require dedicated low-noise routing: AVIN decoupling must be placed close to the pin, and AGND should connect to the main ground plane at a single point near the IC to avoid noise coupling into the feedback path.
How does the LM20145QMHX/NOPB implement slope compensation, and why is it different from conventional approaches?
The LM20145QMHX/NOPB uses nonlinear parabolic slope compensation instead of linear ramp injection. This design dynamically adjusts compensation magnitude based on output voltage-providing stronger stabilization at high VOUT and reduced overcompensation at low VOUT. As a result, the LM20145QMHX/NOPB maintains loop stability across its full 0.8V–5.5V output range without requiring manual compensation changes or external components.
What are the key differences between the LM20145QMHX/NOPB and the commercial-grade LM20145MHX/NOPB?
The LM20145QMHX/NOPB is the automotive-qualified variant, certified to AEC-Q100 Grade 1 (−40°C to +125°C junction), with enhanced test coverage, lot traceability, and failure rate reporting. The LM20145MHX/NOPB is commercial grade (−20°C to +85°C), lacking automotive qualification documentation and extended temperature validation. Both share identical electrical specifications, pinout, and package-but only the Q-grade version meets automotive reliability requirements.
LM20145QMHX/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:
- 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
LM20145QMHX/NOPB FAQ
1.How can I place an order for LM20145QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20145QMHX/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 LM20145QMHX/NOPB reliable?
The price and inventory of LM20145QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20145QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM20145QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20145QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20145QMHX/NOPB?
LM20145QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20145QMHX/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 LM20145QMHX/NOPB?
For technical support, including LM20145QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20145QMHX/NOPB requirements.
6.How does Aetrix verify that LM20145QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20145QMHX/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 LM20145QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM20145QMHX/NOPB?
All LM20145QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20145QMHX/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 LM20145QMHX/NOPB part is unused and in its original packaging.
Return procedure for LM20145QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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