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Texas Instruments LM3102QMHX/NOPB
- Part No.:
- LM3102QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3102QMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,262
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Product details
Overview
LM3102QMHX/NOPB from Texas Instruments is a synchronous step-down DC-DC regulator with integrated dual N-channel MOSFETs, delivering up to 2.5 A output current across 4.5 V–42 V input range, featuring constant-on-time (COT) control, 0.8 V ±1.5% internal reference, and valley current limiting at 2.7 A - used in automotive body electronics and industrial point-of-load conversion.
For engineers reviewing the LM3102QMHX/NOPB datasheet, LM3102QMHX/NOPB pinout, LM3102QMHX/NOPB application, or LM3102QMHX/NOPB equivalent, key selection considerations include its HTSSOP-20 thermal performance (RθJA = 30°C/W), programmable switching frequency up to 1 MHz via RON, ceramic-capacitor compatibility without loop compensation, and prebias start-up capability for reliable power sequencing.
Technical Context
The LM3102QMHX/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 input voltage 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 dual N-channel power stage includes main and synchronous MOSFETs with RDS(on) of 0.18 Ω and 0.11 Ω respectively, supported by bootstrap gate drive (BST–SW), VCC startup regulator (6 V, 65 mA), and valley-current-limit protection triggered at 2.7 A during synchronous FET conduction.
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 batteries and 5/12/24 VDC industrial rails. |
| Output Current | 2.5 A continuous - thermally limited; derates to ~1.9 A at 100°C ambient with 40 cm² 2-oz copper ground plane. |
| Reference Voltage | 0.8 V ±1.5% - sets minimum adjustable output; enables precise 3.3 V, 5 V, or custom rail generation via FB resistor divider. |
| Switching Frequency | Up to 1 MHz - programmable via external RON; maintains stability with ceramic output capacitors, no loop compensation required. |
| Current Limit Threshold | 2.7 A valley current limit - protects against overload by disabling next ON-time until inductor current falls below threshold. |
| Thermal Shutdown | 165°C activation with 20°C hysteresis - disables main FET and grounds SS pin; resumes operation at ~145°C junction temperature. |
| VCC Startup Regulator | 6 V output, 65 mA current limit - powers internal circuitry; requires ≥680 nF bypass capacitor on VCC pin for stability. |
Pinout & Package
LM3102QMHX/NOPB is housed in a thermally enhanced HTSSOP-20 (PWP) package (6.50 mm × 4.40 mm) with exposed power pad (EP) for improved heat dissipation. Pin functions are validated per TI SNVS515I Rev I datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply (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; supplies floating gate drive voltage for high-side N-FET. |
| SW | Switching Node | Drain connection of main N-FET and source of sync N-FET; drives external inductor and forms buck switching node. |
| AGND | Analog Ground | Reference ground for FB, SS, EN, RON, and internal analog circuits; must be separated from PGND at single-point star ground. |
| PGND | Power Ground | Return path for high-current inductor and sync FET; connects to exposed pad (EP) and input/output capacitor grounds. |
| FB | Feedback Input | Monitors output voltage via resistor divider; compared to 0.8 V reference to initiate ON-time when voltage drops below threshold. |
| EN | Enable Control | Active-high logic input; device enabled when voltage >1.18 V; pulled low (<1 V) forces shutdown and discharges SS pin. |
| RON | Frequency Programming | Resistor-connected pin setting ON-time duration; determines switching frequency inversely with VIN (fSW ≤ 1 MHz). |
| SS | Soft-Start Control | Internal 8 µA current source charges external CSS capacitor; controls output voltage ramp rate and prevents inrush current. |
| VCC | Internal Bias Supply | 6 V regulated output powering gate drivers and control logic; UVLO threshold at 3.75 V ensures safe startup sequence. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | COT architecture eliminates need for external compensation network - reduces BOM count and layout sensitivity to capacitor ESR. |
| Ceramic capacitor compatible | Stable operation with low-ESR ceramic output caps - avoids bulk electrolytic capacitors, improves reliability and temperature stability. |
| Prebias start-up | Supports powering into precharged output rails - prevents reverse current flow and ensures controlled ramp-up even with existing VOUT voltage. |
| Ultra-fast transient response | Sub-microsecond load step recovery due to COT control and absence of phase-margin constraints - critical for FPGA and DSP core rails. |
| Programmable soft-start | External CSS capacitor sets output voltage ramp time - mitigates inrush current and avoids undershoot/overshoot during power-on. |
| Output overvoltage protection | 0.92 V FB overvoltage threshold triggers immediate ON-time termination - safeguards downstream ICs during line transients or feedback fault. |
Applications
| Automotive Telematics Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers microcontroller, CAN transceiver, and GPS module in vehicle infotainment head unit from 12 V battery rail with cold-crank tolerance down to 4.5 V. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting unregulated automotive battery to stable 3.3 V or 5 V system rail. Use Value: Maintains regulation during engine cranking dips; DCM mode sustains efficiency at standby current <10 mA; thermal shutdown prevents failure under sealed enclosure conditions. |
Use Scenario: Supplies isolated field I/O circuitry in programmable logic controller with wide-input 24 VDC industrial bus. IC Role / Device Role / Timing Role: High-efficiency buck converter generating 5 V local rail for digital isolators and ADC front-end. Use Value: Handles 42 V transients per ISO 7637-2; valley current limit prevents latch-up during short-circuit events on field wiring; HTSSOP-20 EP pad enables conduction cooling on metal-backed PCB. |
| Storage System Backplane Converter | Embedded Networking Equipment |
|
Use Scenario: Generates 1.8 V or 3.3 V for SATA/SAS controller ASICs and flash memory buffers in enterprise SSD enclosures. IC Role / Device Role / Timing Role: Secondary buck regulator fed from intermediate 5 V or 12 V backplane, delivering clean low-noise core voltage. Use Value: Ultra-low output ripple (<15 mVpp) due to COT control and ceramic cap compatibility; 2.5 A capacity supports burst-mode NAND access; soft-start prevents voltage droop on shared backplane. |
Use Scenario: Powers Ethernet PHY, switch fabric, and management MCU in compact PoE-powered access points. IC Role / Device Role / Timing Role: Compact, high-density DC-DC stage converting PoE-derived 48 V or mid-rail 12 V to 3.3 V system voltage. Use Value: Small solution size (≤120 mm² total footprint) enabled by integrated FETs and minimal external components; 1 MHz operation allows use of 2.2 µH inductors; prebias start-up supports hot-swap insertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3102TLX/NOPB | Same die in DSBGA-28 package; lower 1.5 A rated output current; RθJA = 50°C/W vs. 30°C/W for HTSSOP-20. | Suitable for space-constrained portable designs where thermal budget allows reduced current; not interchangeable without layout change. | Select LM3102TLX/NOPB only when board area is critical and peak load ≤1.5 A; verify thermal margin with 2-layer PCB. |
| TPS54240DGQR | Adjustable 3.5 A buck with current-mode control; wider 3.5–42 V input; requires external compensation; no integrated high-side FET. | Better suited for designs needing higher current or tighter output accuracy; lacks prebias start-up and ceramic-cap stability out-of-box. | Choose TPS54240DGQR if design requires >2.5 A or needs adjustable current limit; accept added complexity of compensation network and external FET. |
Compared with LM3102TLX/NOPB, LM3102QMHX/NOPB delivers 67% higher output current and 40% better thermal resistance, making it preferred for industrial and automotive loads above 1.8 A; versus TPS54240DGQR, it trades external component flexibility for faster time-to-market with zero-compensation design and guaranteed ceramic-cap stability.
Availability
LM3102QMHX/NOPB is available at Aetrix Electronics and suitable for automotive telematics, industrial PLC I/O modules, and embedded networking equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM3102QMHX/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and communications markets.
The LM3102QMHX/NOPB belongs to TI's high-voltage synchronous buck regulator product line, engineered for robust operation in harsh environments - specifically targeting automotive body electronics and industrial control systems requiring wide-input, high-efficiency, and thermally resilient DC-DC conversion.
FAQ
What is the maximum input voltage rating for the LM3102QMHX/NOPB?
The LM3102QMHX/NOPB has an absolute maximum input voltage rating of 43.5 V, but its recommended operating input voltage range is 4.5 V to 42 V. Operation above 42 V risks exceeding thermal limits or triggering overvoltage protection, especially under high ambient temperatures or heavy load conditions. The device is designed for automotive and industrial applications where 24 V and 42 V nominal rails are common.
Does the LM3102QMHX/NOPB support prebias start-up, and how does it behave?
Yes, the LM3102QMHX/NOPB supports prebias start-up. When powered into a precharged output rail, the internal control logic prevents reverse current flow through the synchronous MOSFET by delaying main FET turn-on until the output voltage begins rising naturally. This avoids damaging downstream components and ensures monotonic output ramp-up - confirmed in TI SNVS515I Section 7.3.8 and Figure 12.
Can the LM3102QMHX/NOPB operate with all-ceramic output capacitors?
Yes, the LM3102QMHX/NOPB is explicitly designed to operate stably with all-ceramic output capacitor networks. Its Constant-On-Time (COT) control architecture does not rely on output capacitor ESR for loop stability, unlike traditional voltage-mode or current-mode regulators. This eliminates the need for tantalum or aluminum electrolytic capacitors and improves reliability across temperature extremes.
What is the purpose of the RON pin on the LM3102QMHX/NOPB, and how is it used?
The RON pin on the LM3102QMHX/NOPB sets the ON-time duration of the main MOSFET via an external resistor, thereby determining the switching frequency. The relationship is approximately fSW ≈ 1.3×10⁻¹⁰ × RON / [(VIN − VOUT) × RON], allowing frequency programming up to 1 MHz. RON must be selected so that minimum ON-time remains ≥150 ns at maximum VIN to ensure stable operation.
How does the LM3102QMHX/NOPB handle overvoltage conditions on the output?
The LM3102QMHX/NOPB includes dedicated output overvoltage protection (OVP) that monitors the FB pin voltage against a 0.92 V internal threshold. If exceeded - e.g., due to sudden load removal or feedback resistor open - the controller immediately terminates the current ON-time pulse. The synchronous FET remains active briefly to discharge the inductor, then turns off once current reaches zero, preventing sustained overvoltage at the output.
LM3102QMHX/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM3102QMHX/NOPB FAQ
1.How can I place an order for LM3102QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3102QMHX/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 LM3102QMHX/NOPB reliable?
The price and inventory of LM3102QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3102QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3102QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3102QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3102QMHX/NOPB?
LM3102QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3102QMHX/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 LM3102QMHX/NOPB?
For technical support, including LM3102QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3102QMHX/NOPB requirements.
6.How does Aetrix verify that LM3102QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3102QMHX/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 LM3102QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3102QMHX/NOPB?
All LM3102QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3102QMHX/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 LM3102QMHX/NOPB part is unused and in its original packaging.
Return procedure for LM3102QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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