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Texas Instruments LM3100MHX/NOPB
- Part No.:
- LM3100MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3100MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,105
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Product details
Overview
LM3100MHX/NOPB from Texas Instruments is a synchronous step-down DC-DC regulator integrating dual 40 V N-channel MOSFETs, delivering up to 1.5 A output current with 0.8 V ±1.5% reference voltage, operating across 4.5 V–36 V input range, and supporting programmable switching frequency up to 1 MHz in industrial power conversion applications.
For engineers reviewing the LM3100MHX/NOPB datasheet, LM3100MHX/NOPB pinout, LM3100MHX/NOPB application, or LM3100MHX/NOPB equivalent, key selection considerations include valley current limit (1.9 A), constant on-time (COT) control eliminating loop compensation, soft-start via external capacitor, bootstrap gate drive architecture, and thermal shutdown at 165°C.
Technical Context
The LM3100MHX/NOPB implements Constant ON-Time (COT) regulation with inverse VIN–tON relationship, enabling near-constant switching frequency across line/load variations without external compensation. Its valley-current-limit detection monitors recirculating current through the synchronous low-side switch during off-time.
Internal 6 V start-up regulator (VCC) powers gate drivers and control circuitry, with 3.75 V UVLO threshold and 65 mA current limit. Feedback regulation uses a precision 0.8 V internal reference compared against resistor-divider voltage at FB pin, while over-voltage protection triggers at 0.92 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports wide industrial and automotive supply rails including 12 VDC, 24 VDC, and multi-cell battery inputs. |
| Output Current | 1.5 A continuous - sufficient for point-of-load regulation in embedded controllers and communication modules. |
| Reference Voltage | 0.8 V ±1.5% - enables precise adjustable output down to 0.8 V using external RFB1/RFB2 divider. |
| Switching Frequency | Up to 1 MHz - programmable via RON resistor; higher frequencies allow smaller inductors and faster transient response. |
| Current Limit Threshold | 1.9 A valley current - protects against overload by inhibiting high-side switch until inductor current decays below threshold. |
| Thermal Shutdown | 165°C with 20°C hysteresis - automatically disables switching and grounds SS pin to prevent junction damage. |
| VCC Regulator | 6 V nominal, 65 mA current limit - supplies internal logic and gate drivers; requires ≥680 nF ceramic capacitor for stability. |
Pinout & Package
LM3100MHX/NOPB is housed in a thermally enhanced HTSSOP-20 package (6.50 mm × 4.40 mm) with exposed thermal pad (EP) connected to GND. The 20-pin layout includes dual PGND pins (17,18), dual VIN pins (4,5), dual SW pins (2,3), and six no-connect (N/C) pins (1,9,10,11,12,19).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (2,3) | Switching Node | Internally connects to source of high-side MOSFET; ties to inductor output node and BST capacitor. |
| VIN (4,5) | Input Supply | Primary power input (4.5–36 V); connects to bulk input capacitor and feeds internal VCC regulator. |
| BST (6) | Bootstrap Supply | Connects 0.033 µF capacitor to SW; enables floating gate drive for high-side N-MOSFET. |
| GND (7) | Analog Ground | Reference for internal comparators, regulators, and feedback circuitry; separate from PGND. |
| SS (8) | Soft-Start Control | 8 µA internal current source charges external capacitor to ramp output voltage and limit inrush current. |
| FB (13) | Feedback Input | Compares resistor-divider voltage against 0.8 V reference to regulate output; bias current ≤100 nA. |
| EN (14) | Enable Input | Active-high enable; device starts when voltage exceeds 1.26 V (±90 mV hysteresis). |
| RON (15) | On-Time Programming | Resistor from VIN sets high-side switch on-time; determines operating frequency and minimum tON (≥200 ns). |
| VCC (16) | Start-Up Regulator Output | 6 V regulated supply for internal circuits; requires ≥680 nF ceramic capacitor to ground for stability. |
| PGND (17,18) | Power Ground | Source connection for synchronous rectifier MOSFET; must tie directly to power ground plane. |
| TST (11) | Test Mode Enable | Must be grounded for normal operation; floating or high forces test mode (not used in production). |
| N/C (1,9,10,12,19,20) | No Connection | Unbonded pins; must remain unconnected per datasheet to avoid parasitic coupling or latch-up. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant ON-Time (COT) architecture eliminates need for external compensation network, reducing BOM count and layout sensitivity. |
| Stable with ceramic output capacitors | Does not rely on output capacitor ESR for stability-enables use of low-ESR, high-reliability ceramic capacitors instead of electrolytics. |
| Ultra-fast transient response | Fixed on-time control and valley-current limiting enable sub-microsecond recovery from load steps without overshoot or ringing. |
| Integrated dual N-channel switches | 40 V rated high- and low-side MOSFETs reduce external component count and improve efficiency over discrete solutions. |
| Programmable frequency up to 1 MHz | RON resistor allows frequency tuning to balance size (smaller L/C), efficiency, and EMI performance for specific system constraints. |
Applications
| Industrial PLC Power Rails | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Providing stable 3.3 V or 5 V rail from 12 V or 24 V vehicle battery to microcontrollers and CAN transceivers in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.5 A with input transient tolerance up to 40 V and thermal robustness for under-hood environments. Use Value: Eliminates need for pre-regulator stages; integrated switches and COT control ensure reliable startup during cold-crank (≥4.5 V) and fast recovery from load dumps. |
Use Scenario: Generating 0.8 V core voltage for ARM-based telematics processors in infotainment head units powered from 12 VDC systems. IC Role / Device Role / Timing Role: Adjustable-output buck converter with precision 0.8 V reference and tight regulation (±1.5%) for processor core supply. Use Value: Enables direct core regulation without external LDO; valley-current limit prevents damage during processor burst loads. |
| Point-of-Load for Industrial Sensors | Broadband Infrastructure Power |
|
Use Scenario: Delivering clean 1.2 V or 1.8 V to analog sensor signal chains or ADCs in factory automation I/O modules operating from 24 VAC/DC field supplies. IC Role / Device Role / Timing Role: Compact, low-noise synchronous buck regulator with ceramic-capacitor compatibility and soft-start to minimize sensor offset drift during power-up. Use Value: Reduces solution size vs. traditional controllers + external FETs; SS pin allows coordinated sequencing with other rails. |
Use Scenario: Powering FPGA I/O banks or Ethernet PHYs in base station remote radio units supplied from 48 V intermediate bus. IC Role / Device Role / Timing Role: High-input-voltage buck converter stepping 48 V down to 3.3 V or 5 V with 1.5 A capability and robust ESD rating (±2 kV HBM). Use Value: Withstands telecom surge transients; HTSSOP-20 package provides thermal margin for convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3102MHX/NOPB | Same HTSSOP-20 package and COT architecture, but rated for 2.5 A output and 42 V absolute max input; higher RDS(on) for low-side switch (0.14 Ω vs. 0.11 Ω). | Supports higher current loads (e.g., multi-core SoCs); less suitable for space-constrained 1.5 A designs due to larger thermal footprint. | Select LM3102MHX/NOPB only if >1.5 A sustained current or >36 V input transients are required; otherwise LM3100MHX/NOPB offers better cost/size trade-off. |
| TPS5430DDAR | 3 A current rating, fixed 500 kHz frequency, external compensation required; uses different current-mode control and lacks valley-current limiting. | Requires additional compensation components and careful loop tuning; better suited for noise-sensitive analog systems where fixed frequency simplifies filtering. | Choose TPS5430DDAR when fixed-frequency operation and higher current are mandatory; LM3100MHX/NOPB is preferred for minimal BOM, fast transients, and ceramic-capacitor-only designs. |
Compared with LM3102MHX/NOPB and TPS5430DDAR, LM3100MHX/NOPB uniquely combines 1.5 A capability, no-compensation COT control, valley-current protection, and ceramic-capacitor stability in a compact HTSSOP-20 package-making it optimal for cost-sensitive, space-constrained industrial and automotive point-of-load applications.
Availability
LM3100MHX/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, automotive body electronics, point-of-load regulators, and broadband infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3100MHX/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.
LM3100MHX/NOPB belongs to TI's Simple Switcher® family of integrated DC-DC regulators, designed specifically for engineers seeking minimal-component, easy-to-design, high-efficiency buck converters for industrial, automotive, and communications equipment.
FAQ
What is the minimum input voltage required for stable operation of LM3100MHX/NOPB?
The LM3100MHX/NOPB requires a minimum input voltage of approximately 4.0 V to maintain stable operation. This is determined by the VCC regulator's dropout voltage and its under-voltage lockout (UVLO) falling threshold of ≈3.7 V. Below 4.0 V, the VCC UVLO activates and disables the buck switch. Verified operating range is 4.5 V to 36 V per datasheet Section 6.3.
How does the LM3100MHX/NOPB achieve stability without external compensation components?
The LM3100MHX/NOPB uses a Constant ON-Time (COT) regulation scheme that inherently avoids phase-margin concerns. It does not rely on output capacitor ESR for stability-unlike many COT regulators-and maintains stability with ceramic or polymer capacitors. The control loop responds directly to FB voltage crossing the 0.8 V reference, eliminating need for external RC networks.
Can LM3100MHX/NOPB operate with an all-ceramic output capacitor network?
Yes, LM3100MHX/NOPB is explicitly designed to be stable with ceramic and other very low-ESR output capacitors. Its COT architecture and internal compensation eliminate dependence on capacitor ESR, allowing use of high-reliability, small-footprint ceramic capacitors without risk of oscillation or poor transient response.
What is the function of the RON pin on LM3100MHX/NOPB, and how is it configured?
The RON pin on LM3100MHX/NOPB sets the high-side switch on-time via an external resistor connected between VIN and RON. This resistor determines switching frequency (up to 1 MHz) and ensures minimum on-time ≥200 ns at maximum VIN for proper current limit operation. Typical values range from 10 kΩ to 100 kΩ depending on target frequency and input voltage.
Does LM3100MHX/NOPB include thermal protection, and how does it behave during fault conditions?
Yes, LM3100MHX/NOPB includes thermal shutdown activated at 165°C (typical) with 20°C hysteresis. When triggered, it disables the buck switch and on-timer, grounds the SS pin, and places the device in low-power reset state. Operation resumes automatically once junction temperature falls below 145°C, ensuring safe recovery without manual intervention.
LM3100MHX/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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 7.2V
- Current - Output:
- 1.5A
- 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
LM3100MHX/NOPB FAQ
1.How can I place an order for LM3100MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3100MHX/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 LM3100MHX/NOPB reliable?
The price and inventory of LM3100MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3100MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3100MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3100MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3100MHX/NOPB?
LM3100MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3100MHX/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 LM3100MHX/NOPB?
For technical support, including LM3100MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3100MHX/NOPB requirements.
6.How does Aetrix verify that LM3100MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3100MHX/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 LM3100MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3100MHX/NOPB?
All LM3100MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3100MHX/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 LM3100MHX/NOPB part is unused and in its original packaging.
Return procedure for LM3100MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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