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Texas Instruments LM3102MHX/NOPB
- Part No.:
- LM3102MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3102MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,814
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Product details
Overview
LM3102MHX/NOPB from Texas Instruments is a synchronous step-down DC-DC regulator integrating dual N-channel MOSFETs, delivering up to 2.5 A output current with input voltage range 4.5 V to 42 V, adjustable output down to 0.8 V ±1.5%, and programmable switching frequency up to 1 MHz - used in industrial control power rails and automotive body electronics.
For engineers reviewing the LM3102MHX/NOPB datasheet, LM3102MHX/NOPB pinout, LM3102MHX/NOPB application, or LM3102MHX/NOPB equivalent, key selection criteria include valley current limit (2.7 A), COT control architecture requiring no loop compensation, ceramic-capacitor stability, prebias start-up capability, and thermal shutdown at 165°C.
Technical Context
The LM3102MHX/NOPB implements Constant ON-Time (COT) regulation using an internal 0.8-V reference and comparator-driven one-shot timer, where ON-time varies inversely with VIN to maintain near-constant switching frequency across line variations. It operates in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), with zero-coil-current detection enabling efficient light-load operation.
Its integrated gate driver uses a bootstrap capacitor (BST–SW) for high-side N-MOSFET drive, with VCC startup regulator (6 V, 65 mA) and gate-drive UVLO (3.3 V). Protection includes output overvoltage detection (0.92 V threshold), valley current limiting (2.7 A), thermal shutdown (165°C), and EN-controlled shutdown with internal pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct conversion from 2–4-cell Li-ion, 12/24 VDC systems, and industrial 24/48 VAC rectified rails. |
| Output Current | 2.5 A - maximum continuous load current under thermal derating limits (100°C ambient with 40 cm² 2 oz copper). |
| Reference Voltage | 0.8 V ±1.5% - sets precision output via external resistor divider; enables 0.8 V minimum output with tight regulation. |
| Switching Frequency | Up to 1 MHz - programmable via RON resistor; higher frequencies allow smaller inductors but increase switching loss. |
| Valley Current Limit | 2.7 A - protects against overload by disabling ON-time until inductor current falls below threshold. |
| Thermal Shutdown | 165°C with 20°C hysteresis - forces reset and SS pin discharge; resumes operation only after junction cools to ~145°C. |
| VCC Startup Regulator | 6 V output, 65 mA current limit - powers internal circuitry; requires ≥680 nF bypass capacitor for stable bias. |
Pinout & Package
LM3102MHX/NOPB is packaged in thermally enhanced HTSSOP-20 (6.50 mm × 4.40 mm) with exposed power pad (EP) for improved thermal dissipation. Pin functions are validated per TI SNVS515I Rev I datasheet, Section 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Main supply input (4.5–42 V); connects to bulk input capacitor and feeds internal VCC regulator. |
| BST | Bootstrap Supply | Connects to bootstrap capacitor (CBST) between BST and SW; enables high-side N-MOSFET gate drive. |
| SW | Switching Node | Drain connection of main MOSFET and source of synchronous MOSFET; ties to inductor and output filter. |
| AGND | Analog Ground | Reference ground for FB, SS, EN, RON; must be separated from PGND at single point to minimize noise coupling. |
| PGND | Power Ground | High-current return path for MOSFETs and inductor; connects directly to EP for thermal and EMI performance. |
| FB | Feedback Input | Senses output voltage via resistor divider; compares to 0.8 V internal reference to regulate ON-time. |
| EN | Enable Control | Active-high logic input; internal pull-up; pulls low (<1 V) to disable regulator and discharge SS pin. |
| RON | ON-Time Programming | Resistor-connected pin setting ON-time duration and thus switching frequency; inverse relationship with VIN. |
| SS | Soft-Start Control | Internal 8 µA current source charges external CSS; controls output ramp rate and prevents inrush current. |
| VCC | Bias Supply Output | 6 V regulated output powering gate drivers and control logic; requires ≥680 nF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | COT architecture eliminates external compensation network - reduces BOM count and layout sensitivity to capacitor ESR. |
| Stable with ceramic capacitors | Zero reliance on output capacitor ESR for stability - enables use of small, low-profile, high-reliability MLCCs. |
| Prebias start-up | Regulator safely starts into precharged output without reverse current or overshoot - critical for hot-swap and redundant power systems. |
| Ultra-fast transient response | Fixed ON-time + comparator-based control yields sub-microsecond recovery from load steps - maintains tight regulation under dynamic loads. |
| Integrated dual N-MOSFETs | Reduces external component count and PCB footprint - eliminates need for discrete high-side and synchronous rectifier FETs. |
Applications
| Industrial PLC Power Rail | Automotive Body Control Module |
|---|---|
Use Scenario: Providing clean 3.3-V or 5-V rail for microcontrollers and I/O drivers in programmable logic controllers operating from 24-VDC industrial bus. IC Role / Device Role / Timing Role: Primary buck converter supplying regulated core voltage; handles wide input transients (e.g., load dump, cold crank) and meets IEC 61000-4-5 surge immunity requirements. Use Value: 42-V max input withstands 24-V system surges; thermal shutdown and OVP protect downstream logic during fault conditions. | Use Scenario: Generating 5-V supply for door module ECUs powered from vehicle battery (9–16 V nominal, up to 42 V during jump-start or alternator load dump). IC Role / Device Role / Timing Role: Point-of-load regulator converting battery voltage to MCU and CAN transceiver supply; supports prebias start-up during ignition sequence. Use Value: 2.5-A capability drives multiple peripherals; DCM mode extends battery life in sleep state; HTSSOP-20 package fits constrained under-hood space. |
| Telecom Point-of-Load | Storage System Board Power |
Use Scenario: Delivering 1.2-V or 1.8-V core voltage to FPGA or DSP in broadband infrastructure equipment powered from 12-V or 48-V intermediate bus. IC Role / Device Role / Timing Role: High-efficiency, fast-transient buck regulator placed adjacent to processor; operates at 1 MHz to minimize inductor size. Use Value: Ceramic-capacitor compatibility simplifies filtering; ultra-fast transient response maintains voltage within ±3% during burst-mode processing loads. | Use Scenario: Supplying 3.3-V or 5-V rails to SSD controller, NAND flash, and interface ICs in enterprise storage enclosures with 12-V backplane input. IC Role / Device Role / Timing Role: Secondary regulator stepping down 12-V intermediate bus; must survive repeated thermal cycling and meet long-term reliability targets. Use Value: Thermally enhanced HTSSOP-20 package with EP improves power dissipation; valley current limit prevents damage during short-circuit events on dense PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5115MHX/NOPB | External MOSFET driver (no integrated FETs); supports up to 75-V input; requires separate high-side and sync FETs. | Used where higher input voltage (>42 V) or higher output current (>2.5 A) is needed; larger solution size due to external FETs. | Select when input exceeds 42 V or thermal budget allows discrete FETs; not drop-in compatible with LM3102MHX/NOPB. |
| TPS54227DDAR | 2.2-A rated; 4.5–18-V input; integrated FETs; fixed 500-kHz frequency; no RON programming or valley current limit. | Targeted at lower-voltage, lower-current applications (e.g., 12-V embedded systems); lacks 42-V tolerance and programmable frequency. | Choose for cost-sensitive 12-V designs where 2.2-A output suffices and fixed frequency is acceptable; different pinout and feedback scheme. |
Compared with LM5115MHX/NOPB, LM3102MHX/NOPB offers lower BOM count and smaller footprint due to integrated FETs but sacrifices input voltage headroom; compared with TPS54227DDAR, it provides higher current, wider VIN, and design flexibility via RON and valley current limit - making it preferable for ruggedized 24/48-V industrial and automotive applications.
Availability
LM3102MHX/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive telematics, and broadband infrastructure applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LM3102MHX/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, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive power solutions.
The LM3102 product line delivers highly integrated synchronous buck regulators for demanding input voltage ranges (up to 42 V) and compact industrial, automotive, and telecom power supplies - designed to reduce design time and improve thermal robustness in harsh environments.
FAQ
What is the maximum input voltage supported by the LM3102MHX/NOPB?
The LM3102MHX/NOPB supports a maximum input voltage of 42 V, verified per Absolute Maximum Ratings in TI SNVS515I Rev I. This enables direct operation from 24-VDC industrial buses and automotive battery systems including load-dump transients. Operation above 42 V risks permanent damage; design margin should maintain VIN ≤42 V under all conditions including ripple and transients.
Does the LM3102MHX/NOPB require external compensation components?
No, the LM3102MHX/NOPB uses Constant ON-Time (COT) control and requires no external loop compensation components. Its stability is inherently independent of output capacitor ESR, allowing reliable operation with ceramic capacitors. This eliminates compensation resistors and capacitors, reducing BOM count and layout complexity while ensuring consistent transient response across temperature and load.
How does the soft-start function work on the LM3102MHX/NOPB?
The LM3102MHX/NOPB implements soft-start via an internal 8-µA current source charging an external capacitor (CSS) connected to the SS pin. As CSS charges, the reference voltage ramps linearly, causing controlled output voltage rise and limiting inrush current. The SS pin is actively discharged during shutdown, thermal fault, or EN deactivation - ensuring safe, repeatable start-up sequences in systems with prebiased outputs.
What protection features are built into the LM3102MHX/NOPB?
The LM3102MHX/NOPB integrates output overvoltage protection (0.92-V FB threshold), valley current limiting (2.7-A threshold), thermal shutdown (165°C activation), VCC undervoltage lockout (3.75-V rising threshold), and gate-drive UVLO (3.3-V BST–SW threshold). These operate independently and concurrently to safeguard the IC and downstream circuitry during fault conditions without external components.
Can the LM3102MHX/NOPB operate with a prebiased output voltage?
Yes, the LM3102MHX/NOPB supports prebias start-up: it safely starts into an already charged output without forcing reverse current through the inductor or causing output overshoot. This behavior is confirmed in TI's application notes and typical waveforms (Figure 12), making LM3102MHX/NOPB suitable for hot-swap, redundant power, and systems with backup supplies where output voltage may be present before enable.
LM3102MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 20-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):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 2.5A
- Frequency - Switching:
- Up to 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM3102MHX/NOPB FAQ
1.How can I place an order for LM3102MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3102MHX/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 LM3102MHX/NOPB reliable?
The price and inventory of LM3102MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3102MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3102MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3102MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3102MHX/NOPB?
LM3102MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3102MHX/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 LM3102MHX/NOPB?
For technical support, including LM3102MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3102MHX/NOPB requirements.
6.How does Aetrix verify that LM3102MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3102MHX/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 LM3102MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3102MHX/NOPB?
All LM3102MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3102MHX/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 LM3102MHX/NOPB part is unused and in its original packaging.
Return procedure for LM3102MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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