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Texas Instruments LM20145QMHE/NOPB
- Part No.:
- LM20145QMHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20145QMHE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LM20145QMHE/NOPB from Texas Instruments is a 5A synchronous buck regulator with peak current mode control, adjustable switching frequency (250–750 kHz), and integrated 32 mΩ high-side/36 mΩ low-side FETs. It delivers regulated output down to 0.8V from 2.95–5.5V input, supports pre-biased start-up, and features precision enable, power good, and thermal shutdown-used in FPGA core supply rails requiring tight voltage tracking and fast transient response.
For engineers reviewing the LM20145QMHE/NOPB datasheet, LM20145QMHE/NOPB pinout, LM20145QMHE/NOPB application, or LM20145QMHE/NOPB equivalent, key selection criteria include verified soft-start control via SS/TRK pin, confirmed 800 mV feedback reference accuracy (±12 mV), validated 7.4 A current limit over −40°C to +125°C, and HTSSOP-16 exposed-pad thermal performance (θJA = 38°C/W).
Technical Context
The LM20145QMHE/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 range. Its internal 2.7V sub-regulator powers analog circuitry via VCC, while AVIN/AGND provide isolated bias for error amplifier and modulator.
It integrates OVP (108% of VFB), UVLO (2.7V rising threshold with 45 mV hysteresis), and thermal shutdown at 160°C with 10°C hysteresis. The SS/TRK pin enables dual-mode operation: external capacitor-controlled soft-start or active voltage tracking of higher rail sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous-supports FPGA core loads without external current sharing. |
| Input Voltage Range | 2.95 V to 5.5 V-directly compatible with 3.3 V and 5 V system buses. |
| Feedback Reference | 0.8 V ±12 mV-enables precise 1.2 V, 1.8 V, or 2.5 V outputs with <1% regulation error. |
| Switching Frequency | 250 kHz to 750 kHz-set by RT-to-ground resistor; allows optimization of inductor size vs. efficiency. |
| Current Limit Threshold | 7.4 A typical-minimizes required inductor saturation current rating. |
| Peak Efficiency | 97%-achieved at mid-load with 5 V input / 1.2 V output / 500 kHz operation. |
| Thermal Resistance | θJA = 38°C/W-requires exposed pad soldered to PCB ground plane for full 5 A capability. |
Pinout & Package
LM20145QMHE/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 rated 5 A output and θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start/Tracking control | 5 µA internal current source charges external capacitor; also accepts external voltage for rail tracking. |
| 2 FB | Error amplifier inverting input | Compares output voltage against 0.8 V reference; sets regulation point via RFB1/RFB2 divider. |
| 3 PGOOD | Open-drain power-good indicator | Pulls low when VOUT deviates >6% from target; requires 10–100 kΩ pull-up for sequencing. |
| 4 COMP | External compensation node | Connects RC network to stabilize control loop; supports ceramic, polymer, or electrolytic output caps. |
| 5 NC | No internal connection | Must be connected to AGND or PGND to reduce noise coupling. |
| 6,7 PVIN | High-side switch input | Parallel input pins for low-impedance connection to bulk input capacitor (CIN). |
| 8,9 SW | Power switch node | Drives external inductor; requires careful layout to minimize EMI and ringing in DCM. |
| 10,11 PGND | Power ground return | Low-inductance path for high di/dt switch currents; separate from AGND to avoid noise injection. |
| 12 EN | Precision enable input | Turns on at 1.18 V (typical) with 66 mV hysteresis; supports accurate input-voltage sequencing. |
| 13 VCC | Internal 2.7 V sub-regulator output | Bypass with 1 µF ceramic cap; powers gate drivers and internal logic. |
| 14 AVIN | Analog bias supply input | Connected to VIN through RC filter to suppress noise on error amplifier reference. |
| 15 AGND | Analog ground reference | Quiet ground for FB, COMP, and internal reference; must tie to PGND at single point only. |
| 16 RT | Frequency adjust | Resistor to ground sets oscillator frequency (e.g., 49.9 kΩ → 750 kHz). |
| EP | Exposed thermal pad | Electrically tied to GND; mandatory solder connection to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage-ensures stable current-mode control across full 0.8–5.5 V VOUT range without manual tuning. |
| Pre-biased start-up | Does not sink current during startup if VOUT > 0-prevents damage to FPGA/ASIC loads with parasitic conduction paths. |
| Diode emulation mode | Disables low-side FET at zero inductor current-eliminates reverse current and improves light-load efficiency below 100 mA. |
| Adjustable soft-start | External capacitor on SS/TRK sets monotonic ramp time-controls inrush current and enables reliable PGOOD assertion. |
| Integrated protection suite | OVP, UVLO, thermal shutdown, and cycle-by-cycle current limiting-reduces need for external fault management circuitry. |
Applications
| FPGA Core Supply | DSP I/O Rail Regulation |
|---|---|
Use Scenario: Powers Xilinx Artix-7 or Intel Cyclone V FPGA core logic at 1.2 V with dynamic load steps up to 3 A/µs. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise DC voltage with tracking capability for multi-rail sequencing. Use Value: Pre-biased start-up prevents latch-up during hot-plug; 97% peak efficiency reduces board-level heat dissipation. | Use Scenario: Supplies TI C6000 DSP I/O banks requiring 3.3 V at ≤2 A with strict 2% output tolerance. IC Role / Device Role / Timing Role: Secondary buck converter synchronized to main processor rail using SS/TRK pin for controlled voltage ramp alignment. Use Value: Adjustable soft-start and PGOOD enable deterministic power-on reset timing; 0.8 V reference ensures accuracy across temperature. |
| Optical Transceiver Bias | Industrial PLC Digital I/O |
Use Scenario: Generates stable 2.5 V bias for SFP+ laser driver ICs in 10G Ethernet line cards with high EMI immunity requirements. IC Role / Device Role / Timing Role: Isolated point-of-load regulator with AVIN/AGND separation minimizing noise coupling into sensitive analog bias paths. Use Value: 32 mΩ integrated FETs reduce conduction loss; 750 kHz max switching frequency allows compact 1.0 µH inductor. | Use Scenario: Provides 5 V auxiliary rail for isolated digital I/O modules in DIN-rail mounted PLCs operating from 24 V DC input via intermediate 5 V bus. IC Role / Device Role / Timing Role: High-reliability buck converter with AEC-Q100 Grade 1 qualification (−40°C to +125°C junction). Use Value: Integrated thermal shutdown and OVP protect against field failures; HTSSOP exposed pad sustains 5 A under industrial ambient conditions. |
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 (3.5–60 V); lower max output current (5 A typ. but derated above 40 V); no pre-bias start-up. | Suited for 12–48 V industrial inputs-not direct replacement for 3.3/5 V bus-fed designs. | Select only if input exceeds 5.5 V; verify soft-start and tracking compatibility. |
| MP2315GJ-Z | Fixed 500 kHz frequency; no RT pin; 0.8 V reference; 6 A rated but unqualified for automotive temp grade. | Lacks AEC-Q100 Grade 1 rating and SS/TRK tracking-limited to commercial-grade consumer applications. | Consider for cost-sensitive non-automotive designs where frequency flexibility and rail tracking are unnecessary. |
Compared with TPS54560QPWPRQ1 and MP2315GJ-Z, the LM20145QMHE/NOPB uniquely combines AEC-Q100 Grade 1 qualification, pre-biased start-up, and dual-mode SS/TRK functionality-making it the only option qualified for automotive infotainment SoC core supplies requiring rail coordination and hot-plug robustness.
Availability
LM20145QMHE/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, DSP I/O regulation, optical transceiver bias, industrial PLC I/O, and automotive infotainment SoC power rails requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LM20145QMHE/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 DC-DC conversion.
The LM20145QMHE/NOPB belongs to TI's PowerWise® synchronous buck regulator family-designed specifically for high-efficiency, low-voltage point-of-load applications in automotive, industrial, and communications infrastructure where thermal performance, precision enable, and rail tracking are critical.
FAQ
What is the maximum recommended output current for LM20145QMHE/NOPB under continuous operation?
The LM20145QMHE/NOPB is rated for 5 A continuous output current when used with proper PCB thermal design-including soldering the exposed pad to a minimum 4-layer board with ≥4 thermal vias. At ambient temperatures above 60°C or with inadequate copper area, derating is required per the thermal curves in the SNVS530E datasheet. The device's 7.4 A current limit provides headroom for transient peaks, but sustained operation beyond 5 A risks thermal shutdown activation.
Does LM20145QMHE/NOPB support start-up into a pre-biased output voltage?
Yes, the LM20145QMHE/NOPB supports pre-biased start-up: when VOUT > 0 at power-on, the device will not sink current from the output until the internal soft-start ramp exceeds the FB pin voltage. This behavior protects downstream FPGA or ASIC loads from reverse current damage caused by parasitic conduction paths. The SS/TRK pin must not be externally driven during pre-bias conditions unless intentional tracking is required.
How is the switching frequency set on LM20145QMHE/NOPB?
The switching frequency of LM20145QMHE/NOPB is set by connecting an external resistor between the RT pin and ground. The relationship is approximately fSW ≈ 78 kΩ / RRT − 55 kHz, yielding 250 kHz with 249 kΩ and 750 kHz with 49.9 kΩ. No capacitor is required-only a precision metal-film resistor with ≤1% tolerance is recommended to maintain frequency accuracy across temperature.
What is the purpose of the AVIN and AGND pins on LM20145QMHE/NOPB?
The AVIN and AGND pins on LM20145QMHE/NOPB provide a dedicated low-noise analog supply path for the internal error amplifier and reference circuits. AVIN must be connected to the main input (VIN) through a low-pass RC filter (e.g., 10 Ω + 1 µF), while AGND serves as the quiet ground return-separate from noisy PGND. This isolation minimizes switching noise injection into the feedback loop, ensuring stable regulation and accurate 0.8 V reference performance.
Can LM20145QMHE/NOPB be used in automotive applications?
Yes, the LM20145QMHE/NOPB is qualified to AEC-Q100 Temperature Grade 1 (−40°C to +125°C junction), making it suitable for automotive infotainment, ADAS domain controllers, and body electronics. Its integrated protections-including OVP, UVLO, thermal shutdown, and precise enable with hysteresis-meet functional safety requirements for ASIL-B systems when used within specified operating limits and with appropriate system-level diagnostics.
LM20145QMHE/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
LM20145QMHE/NOPB FAQ
1.How can I place an order for LM20145QMHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20145QMHE/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 LM20145QMHE/NOPB reliable?
The price and inventory of LM20145QMHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20145QMHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM20145QMHE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20145QMHE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20145QMHE/NOPB?
LM20145QMHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20145QMHE/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 LM20145QMHE/NOPB?
For technical support, including LM20145QMHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20145QMHE/NOPB requirements.
6.How does Aetrix verify that LM20145QMHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20145QMHE/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 LM20145QMHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM20145QMHE/NOPB?
All LM20145QMHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20145QMHE/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 LM20145QMHE/NOPB part is unused and in its original packaging.
Return procedure for LM20145QMHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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