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Texas Instruments LM3100MH/NOPB
- Part No.:
- LM3100MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3100MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:934
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Product details
Overview
LM3100MH/NOPB from Texas Instruments is a synchronous step-down DC-DC regulator with integrated 40 V dual N-channel MOSFETs, delivering up to 1.5 A output current across 4.5 V–36 V input range, featuring 0.8 V ±1.5% internal reference and constant-on-time (COT) control for ultra-fast transient response in industrial power supplies.
For engineers reviewing the LM3100MH/NOPB datasheet, LM3100MH/NOPB pinout, LM3100MH/NOPB application, or LM3100MH/NOPB equivalent, this page delivers verified technical context, HTSSOP-20 package mapping, valley current limit (1.9 A), programmable switching frequency up to 1 MHz, and soft-start timing via external capacitor - all confirmed from TI's production data sheet SNVS421H.
Technical Context
The LM3100MH/NOPB implements a Constant ON-Time (COT) regulation scheme where high-side switch on-time is inversely proportional to VIN and set by RON resistor, enabling near-constant switching frequency across line/load variations without loop compensation. Its valley-current-limit detection operates during low-side conduction with 1.9 A threshold.
It integrates a 6 V start-up LDO (VCC) with 65 mA current limit and 3.75 V UVLO, bootstrap gate drive supporting 33 nF BST capacitor, and independent analog (GND) and power (PGND) ground returns - all optimized for ceramic-output-capacitor stability and thermal robustness in HTSSOP-20.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports direct conversion from 12/24 VDC systems and multi-cell Li-ion battery inputs. |
| Output Current | 1.5 A continuous - sufficient for point-of-load regulation in embedded controllers and I/O modules. |
| Reference Voltage | 0.8 V ±1.5% - enables precise adjustable output down to 0.8 V using RFB1/RFB2 divider. |
| Switching Frequency | Up to 1 MHz - programmable via RON resistor; reduces external inductor size and improves transient response. |
| Current Limit | 1.9 A valley current limit - protects against overload by inhibiting high-side switch until inductor current decays below threshold. |
| Thermal Shutdown | 165°C activation with 20°C hysteresis - ensures safe recovery after overtemperature events without manual reset. |
| Package | HTSSOP-20 (6.50 mm × 4.40 mm) with exposed pad - provides low thermal resistance (RθJC = 6.5°C/W) for high-power density layouts. |
Pinout & Package
LM3100MH/NOPB uses a thermally enhanced HTSSOP-20 package with exposed thermal pad (EP) connected to GND. Pin functions are validated per TI SNVS421H Rev H, including dual PGND pins (17,18), dedicated BST (6), SS (8), EN (14), FB (13), RON (15), 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 both MOSFETs; must be routed with low-inductance path to inductor and COUT. |
| VIN (4,5) | Input Supply | Primary power input; accepts 4.5–36 V; requires local CIN decoupling at each pin. |
| BST (6) | Bootstrap Supply | Connects to SW via 0.033 µF capacitor; powers high-side gate driver during on-time. |
| GND (7) | Analog Ground | Reference for internal comparators and bias circuits; separate from PGND to minimize noise coupling. |
| SS (8) | Soft-Start Control | 8 µA internal current source charges external CSS capacitor to ramp output voltage gradually. |
| EN (14) | Enable Input | Active-high enable; ≥1.26 V required to activate regulator; <1.1 V forces shutdown mode. |
| FB (13) | Feedback Input | Compares against 0.8 V reference; sets output voltage via RFB1/RFB2 divider network. |
| RON (15) | On-Time Programming | Resistor from VIN to RON sets high-side on-time; determines operating frequency and minimum on-time. |
| VCC (16) | Start-up Regulator Output | 6 V LDO output; requires ≥680 nF ceramic capacitor to stabilize gate drive and internal circuitry. |
| PGND (17,18) | Power Ground | Source connection for synchronous rectifier MOSFET; must tie directly to power ground plane. |
| EP (DAP) | Exposed Thermal Pad | Electrically and thermally connected to GND; essential for thermal performance and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | COT architecture eliminates need for external compensation network, reducing BOM count and layout sensitivity. |
| Stable with ceramic output capacitors | Does not rely on capacitor ESR for stability - enables use of low-profile, high-reliability MLCCs. |
| Ultra-fast load transient response | Constant on-time control and valley-current limiting enable sub-microsecond recovery from step-load changes. |
| Integrated dual 40 V N-channel switches | Reduces external component count and PCB area; eliminates discrete high-side driver design complexity. |
| Thermally enhanced HTSSOP-20 | 6.5°C/W junction-to-case thermal resistance enables 1.5 A operation without forced air in compact industrial enclosures. |
Applications
| Industrial Power Supplies | Automotive Body Electronics |
|---|---|
Use Scenario: 24 VDC vehicle subsystems requiring clean, regulated 3.3 V or 5 V for microcontrollers and sensors. IC Role / Device Role / Timing Role: Primary buck regulator converting battery-supplied 24 VDC to stable low-voltage rail with fast transient immunity. Use Value: 1.5 A output and 36 V max input withstand automotive load-dump transients; HTSSOP-20 meets under-hood thermal requirements. | Use Scenario: Embedded telematics units powered from 12 VAC/DC sources in infotainment and gateway modules. IC Role / Device Role / Timing Role: Point-of-load regulator supplying FPGA I/O banks or communication ICs with tight voltage tolerance. Use Value: 0.8 V ±1.5% reference and valley-current limit ensure reliable startup and sustained operation during cold-crank conditions. |
| Point-of-Load Regulation | Broadband Infrastructure |
Use Scenario: Compact networking equipment (e.g., PoE injectors, small cell radios) needing efficient 1.2 V/1.8 V rails from 12/48 V backplanes. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter delivering regulated voltage with minimal board space. Use Value: Programmable 1 MHz switching allows small inductors and ceramic capacitors, reducing solution footprint by >30% vs. 500 kHz alternatives. | Use Scenario: Remote radio units and base station control cards operating from 24/48 V telecom supplies. IC Role / Device Role / Timing Role: Primary DC-DC stage converting intermediate bus voltage to processor core or memory supply rails. Use Value: Thermal shutdown (165°C) and gate-drive UVLO protect against field failures in sealed, fanless 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 |
|---|---|---|---|
| LM3102MH/NOPB | Same HTSSOP-20 package; higher 2.5 A output current; identical COT architecture and pinout. | Supports higher load currents in same footprint; requires larger inductor and output capacitance. | Select when >1.5 A output is needed without changing PCB layout. |
| TPS5430DDAR | 3 A output; fixed 500 kHz frequency; requires external compensation; SOIC-8 package. | Larger solution size; lower integration (no integrated high-side FET); less suitable for ceramic-capacitor designs. | Choose for cost-sensitive, lower-frequency applications where layout area is not constrained. |
Compared with LM3100MH/NOPB, LM3102MH/NOPB offers higher current capability in identical packaging and control architecture, while TPS5430DDAR trades integration and ceramic-capacitor compatibility for lower unit cost and simpler thermal management - making LM3100MH/NOPB optimal for space-constrained, fast-transient industrial and automotive loads.
Availability
LM3100MH/NOPB is available at Aetrix Electronics and suitable for industrial controls, automotive body electronics, and broadband infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3100MH/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 and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM3100MH/NOPB belongs to TI's Simple Switcher® family of highly integrated DC-DC regulators, designed specifically for engineers seeking minimal external components, fast time-to-market, and robust operation in harsh environments.
FAQ
What is the maximum input voltage rating for LM3100MH/NOPB?
The LM3100MH/NOPB has an absolute maximum input voltage rating of 40 V, with recommended operating range from 4.5 V to 36 V. Transient input spikes up to 40 V are tolerated, but sustained operation above 36 V may trigger thermal shutdown or damage the internal 40 V MOSFETs. Always verify input transient protection in automotive or industrial applications.
How does the LM3100MH/NOPB achieve stability without external compensation?
The LM3100MH/NOPB achieves stability through its Constant ON-Time (COT) control architecture, which does not depend on output capacitor ESR. Instead, it uses internal feedback comparison against a 0.8 V reference and valley-current limiting to maintain regulation - enabling stable operation with ceramic, polymer, or low-ESR tantalum capacitors without compensation components.
What is the purpose of the RON pin on LM3100MH/NOPB?
The RON pin on LM3100MH/NOPB sets the high-side switch on-time by connecting an external resistor between VIN and RON. This resistor determines the switching frequency (up to 1 MHz) and ensures minimum on-time remains above 200 ns at maximum VIN - critical for proper valley-current-limit functionality and stable light-load operation.
Can LM3100MH/NOPB operate with only ceramic output capacitors?
Yes, LM3100MH/NOPB is explicitly designed to operate stably with ceramic output capacitors. Its COT architecture eliminates reliance on capacitor ESR for loop stability, and TI's datasheet confirms compatibility with "ceramic and other very low ESR capacitors" - simplifying filtering, improving reliability, and reducing solution size.
What thermal protection features does LM3100MH/NOPB include?
LM3100MH/NOPB includes thermal shutdown activated at 165°C (typical) with 20°C hysteresis, gate-drive under-voltage lockout, and VCC under-voltage lockout. When thermal shutdown triggers, the buck switch disables, the on-timer halts, and the SS pin is grounded - ensuring safe recovery once junction temperature falls below 145°C.
LM3100MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM3100MH/NOPB FAQ
1.How can I place an order for LM3100MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3100MH/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 LM3100MH/NOPB reliable?
The price and inventory of LM3100MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3100MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3100MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3100MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3100MH/NOPB?
LM3100MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3100MH/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 LM3100MH/NOPB?
For technical support, including LM3100MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3100MH/NOPB requirements.
6.How does Aetrix verify that LM3100MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3100MH/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 LM3100MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3100MH/NOPB?
All LM3100MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3100MH/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 LM3100MH/NOPB part is unused and in its original packaging.
Return procedure for LM3100MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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