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Texas Instruments LM20145MHE/NOPB
- Part No.:
- LM20145MHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20145MHE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,865
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Product details
Overview
LM20145MHE/NOPB from Texas Instruments is a 5A synchronous buck regulator with peak current mode control, adjustable 250–750 kHz switching frequency, 0.8V to 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 or 5V input buses.
For engineers reviewing the LM20145MHE/NOPB datasheet, LM20145MHE/NOPB pinout, LM20145MHE/NOPB application, or LM20145MHE/NOPB equivalent, key selection criteria include pre-biased start-up capability, ±10 mV SS/TRK tracking accuracy, 97% peak efficiency at 5A, and HTSSOP-16 exposed-pad thermal performance in space-constrained industrial and telecom power designs.
Technical Context
The LM20145MHE/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 FET architecture supports continuous 5A output with cycle-by-cycle current limiting and diode emulation mode below 100 mA load.
Internal protection includes overvoltage (108% of VFB), thermal shutdown (160°C), UVLO (2.7V with 45 mV hysteresis), and precision enable (1.18V threshold with 66 mV hysteresis). The SS/TRK pin enables monotonic soft-start via external capacitor or precise voltage tracking using resistor networks.
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 rails. |
| Switching Frequency | 250 kHz to 750 kHz-adjustable via RT-to-ground resistor; enables optimization of size vs. EMI. |
| Feedback Reference | 0.8V ±12 mV-sets minimum output voltage; enables tight regulation down to sub-1V core supplies. |
| High-Side RDS(on) | 36 mΩ (typ.)-reduces conduction loss at full load; contributes to 97% peak efficiency. |
| Soft-Start Accuracy | ±10 mV tracking error (VSS – VFB)-ensures precise rail sequencing in multi-voltage systems. |
| Thermal Shutdown | 160°C with 10°C hysteresis-prevents permanent damage during sustained overload or poor airflow. |
| PGOOD Threshold | 94% of VFB rising, 2% hysteresis-provides reliable power-good assertion for system boot sequencing. |
Pinout & Package
LM20145MHE/NOPB uses a 16-pin HTSSOP package with exposed thermal pad (Package Number PWP0016A), optimized for PCB heat dissipation without heatsinks. Pin 1 (SS/TRK) is dual-function for soft-start timing or external voltage tracking; Pins 6/7 (PVIN) and 10/11 (PGND) are paralleled for low-impedance power routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start/Tracking control | 5 µA internal current source charges external capacitor; overrides FB reference when driven <800 mV for rail tracking. |
| 2 FB | Feedback input | Connects to resistor divider; senses regulated output against 0.8V internal reference for closed-loop control. |
| 3 PGOOD | Open-drain power-good indicator | Asserts low when VOUT deviates >6% from target; requires 10–100 kΩ pull-up for logic-level signaling. |
| 4 COMP | Compensation node | External RC network sets loop bandwidth and phase margin; enables stability with any capacitor type. |
| 5 NC | No connect | Must be grounded per TI recommendation to minimize noise coupling into analog circuitry. |
| 6,7 PVIN | Power switch input | Parallel pins for high-current VIN path; require local low-ESR ceramic bypass near package. |
| 8,9 SW | Switch node | Drives external inductor; high dv/dt node requiring tight layout and optional snubber for ringing suppression. |
| 10,11 PGND | Power ground return | Low-impedance return for switch currents; must be isolated from AGND except at single-point star ground. |
| 12 EN | Enable control | 1.18V turn-on threshold with 66 mV hysteresis; supports precise input-voltage sequencing via resistor divider. |
| 13 VCC | Internal 2.7V bias supply | Bypass with 1 µF ceramic capacitor; powers internal logic and gate drivers independently of PVIN. |
| 14 AVIN | Analog supply input | Filtered by external RC network to reduce noise on internal bias rails; connects to main VIN. |
| 15 AGND | Analog ground reference | Quiet ground for error amplifier and reference circuits; separated from PGND to prevent switching noise injection. |
| 16 RT | Frequency adjust | Resistor to ground sets oscillator frequency: 49.9 kΩ → 750 kHz, 249 kΩ → 260 kHz. |
| EP | Exposed thermal pad | Weakly tied to GND internally; must be soldered to PCB ground plane to achieve θJA = 38°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased start-up | Enables safe startup into existing VOUT without sinking current-critical for FPGA/ASIC multi-rail sequencing. |
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage, eliminating need for manual slope adjustment across 0.8–5.5V range. |
| Diode emulation mode | Disables reverse inductor current below ~100 mA, improving light-load efficiency without external diode. |
| Integrated OVP + UVLO + thermal shutdown | Single-chip protection suite eliminates discrete fault-detection components and reduces BOM count. |
| Adjustable soft-start | External capacitor sets ramp time; avoids input bus droop and inrush stress on upstream converters or bulk capacitors. |
| HTSSOP-16 exposed pad | Thermal resistance reduced to θJC = 3.5°C/W-enables 5A operation in compact layouts without forced air or heatsinks. |
Applications
| FPGA Core Supply | DSP I/O Rail Regulation |
|---|---|
Use Scenario: Powers Xilinx or Intel FPGA core logic requiring tightly regulated 0.85V–1.2V at up to 5A with strict monotonic startup. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering dynamically scaled core voltage with PGOOD-synchronized configuration. Use Value: Pre-biased start-up prevents damage from parasitic backfeed during partial-power-up sequences; ±10 mV SS/TRK tracking ensures coordinated ramp with auxiliary rails. | Use Scenario: Supplies 1.8V or 2.5V I/O banks for high-speed DSPs in baseband processing units with bursty load profiles. IC Role / Device Role / Timing Role: Point-of-load converter with diode emulation mode maintaining >85% efficiency at 50 mA idle current. Use Value: Adjustable 250–750 kHz switching frequency allows EMI spread-spectrum tuning to avoid interference with ADC sampling clocks. |
| Optical Transceiver Bias | Industrial PLC CPU Module |
Use Scenario: Generates stable 3.3V bias for SFP+ or QSFP transceivers where ripple-induced jitter degrades BER performance. IC Role / Device Role / Timing Role: Low-noise buck regulator with AVIN/AGND separation minimizing switching noise coupling into analog laser driver paths. Use Value: 0.8V reference and precision FB pin enable <1% output ripple with ceramic COUT; PGOOD confirms lock before enabling data lanes. | Use Scenario: Powers ARM Cortex-A9 CPU in ruggedized programmable logic controller with wide ambient temperature range (−40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade buck regulator with AEC-Q100 Grade 1 qualification and 125°C junction rating. Use Value: Thermal shutdown at 160°C and robust UVLO hysteresis ensure reliable operation during brownouts or enclosure overheating events. |
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 3.5–60V input range; lower 3.5A output; fixed 500 kHz frequency; no SS/TRK tracking. | Better suited for 12V/24V industrial inputs; lacks rail-tracking for multi-supply sequencing. | Select when input exceeds 5.5V or tracking is unnecessary; verify thermal design for 3.5A in same footprint. |
| MP2315GJ-Z | 4A output; 4.5–26V input; fixed 500 kHz; no PGOOD or tracking; smaller QFN-10 package. | Cost-optimized for non-critical consumer applications; missing precision enable and OVP protection. | Choose for space-constrained, lower-reliability designs where 5A and rail coordination are not required. |
Compared with TPS54560QPWPRQ1 and MP2315GJ-Z, LM20145MHE/NOPB uniquely combines 5A capability, 0.8V reference, SS/TRK tracking, and AEC-Q100 Grade 1 qualification in a thermally enhanced HTSSOP package-making it optimal for high-integrity, multi-rail embedded computing power delivery.
Availability
LM20145MHE/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, DSP I/O regulation, optical transceiver biasing, and industrial PLC CPU modules requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LM20145MHE/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-efficiency DC-DC conversion.
The LM20145MHE/NOPB belongs to TI's PowerWise® synchronous buck regulator family, engineered for high-density point-of-load power delivery in FPGA, DSP, and ASIC applications demanding precision regulation, rail sequencing, and thermal resilience.
FAQ
What is the maximum continuous output current supported by the LM20145MHE/NOPB?
The LM20145MHE/NOPB supports 5A of continuous output current under typical thermal conditions (θJA = 38°C/W, TA = 25°C). Its 32 mΩ high-side and 36 mΩ low-side integrated FETs, combined with the HTSSOP-16 exposed pad, enable this rating without external current sensing or parallel devices. Derating is required above 85°C ambient or with reduced airflow.
How does the SS/TRK pin function in voltage tracking mode for the LM20145MHE/NOPB?
In voltage tracking mode, the LM20145MHE/NOPB's SS/TRK pin accepts an external reference voltage (e.g., from another regulator's output) via a resistor divider. When the applied voltage falls below 800 mV, it overrides the internal 0.8V feedback reference, forcing the LM20145MHE/NOPB's output to track the external source with ±10 mV accuracy. This enables synchronized startup of multiple rails in complex systems like FPGAs.
Can the LM20145MHE/NOPB start up safely when its output is already biased to 1.2V before enabling?
Yes-the LM20145MHE/NOPB features pre-biased start-up capability. During startup, it will not sink current from a pre-charged output; instead, it waits until the internal soft-start ramp exceeds the FB pin voltage before engaging the high-side FET. This prevents damaging reverse current flow through load parasitics, a critical feature for multi-rail FPGA and ASIC applications.
What is the purpose of the AVIN and AGND pins on the LM20145MHE/NOPB, and how should they be routed?
The AVIN pin supplies clean bias to the LM20145MHE/NOPB's analog circuitry (error amplifier, reference, modulator) and must be filtered via an external RC network from main VIN. AGND is the dedicated quiet ground return for these analog blocks. They must be routed separately from PGND and joined only at a single-point star ground near the device to prevent switching noise from corrupting regulation accuracy.
Does the LM20145MHE/NOPB support adjustable switching frequency, and how is it configured?
Yes-the LM20145MHE/NOPB supports adjustable switching frequency from 250 kHz to 750 kHz via the RT pin. A resistor connected between RT and GND sets the frequency: RT = 49.9 kΩ yields ~750 kHz, while RT = 249 kΩ yields ~260 kHz. The relationship is approximately fSW ≈ 78000/RT − 55 kHz. This allows designers to optimize inductor size, efficiency, and EMI behavior for each application.
LM20145MHE/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20145MHE/NOPB FAQ
1.How can I place an order for LM20145MHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20145MHE/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 LM20145MHE/NOPB reliable?
The price and inventory of LM20145MHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20145MHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM20145MHE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20145MHE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20145MHE/NOPB?
LM20145MHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20145MHE/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 LM20145MHE/NOPB?
For technical support, including LM20145MHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20145MHE/NOPB requirements.
6.How does Aetrix verify that LM20145MHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20145MHE/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 LM20145MHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM20145MHE/NOPB?
All LM20145MHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20145MHE/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 LM20145MHE/NOPB part is unused and in its original packaging.
Return procedure for LM20145MHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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