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Texas Instruments LM3102MH/NOPB
- Part No.:
- LM3102MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3102MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:208
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Product details
Overview
LM3102MH/NOPB from Texas Instruments is a synchronous step-down DC-DC voltage 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 limit of 2.7 A - used in industrial power supplies and automotive body electronics.
For engineers reviewing the LM3102MH/NOPB datasheet, LM3102MH/NOPB pinout, LM3102MH/NOPB application, or LM3102MH/NOPB equivalent, key selection considerations include its HTSSOP-20 thermally enhanced package, programmable switching frequency up to 1 MHz, ceramic-capacitor compatibility without loop compensation, and prebias start-up capability for reliable cold-start operation.
Technical Context
The LM3102MH/NOPB implements a Constant ON-Time (COT) regulation scheme 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. It operates in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), with automatic DCM entry at light loads to sustain high efficiency.
Valley current limiting detects re-circulating current through the synchronous MOSFET during OFF-time, triggering shutdown of the next ON-pulse if current exceeds 2.7 A. Protection includes output overvoltage detection at 0.92 V on FB, thermal shutdown at 165°C with 20°C hysteresis, VCC UVLO at 3.75 V, and gate-drive UVLO at 3.3 V.
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 - rated under thermal derating conditions 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 resistor divider. |
| Switching Frequency | Up to 1 MHz - programmable via RON resistor; higher frequencies allow smaller inductors and faster transient response. |
| Main MOSFET RDS(on) | 0.18 Ω (typ) - reduces conduction loss at full load; contributes to >90% peak efficiency at 3.3 V/2.5 A. |
| Synchronous MOSFET RDS(on) | 0.11 Ω (typ) - minimizes reverse conduction loss and enables efficient DCM operation at light loads. |
| Valley Current Limit | 2.7 A - hard current limit enforced during OFF-time; prevents inductor saturation and ensures safe overload handling. |
Pinout & Package
LM3102MH/NOPB is housed in a thermally enhanced HTSSOP-20 (PWP) package measuring 6.50 mm × 4.40 mm with exposed thermal pad (EP). The 20-pin layout supports high-current routing and efficient heat dissipation in compact industrial and automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary DC input (4.5–42 V); connects to bulk capacitor and feeds internal VCC regulator. |
| BST | Bootstrap Supply | Connects external bootstrap capacitor to SW node; powers high-side gate driver during main MOSFET ON-time. |
| SW | Switching Node | Drain connection of main MOSFET and source of synchronous MOSFET; drives external inductor. |
| AGND | Analog Ground | Reference for FB, SS, EN, RON; must be star-connected to PGND near IC to minimize noise coupling. |
| SS | Soft-Start Control | Internal 8 µA current source charges external capacitor; controls output ramp rate and inrush current. |
| FB | Feedback Input | Monitors output via resistor divider; compares to 0.8 V reference to regulate output voltage. |
| EN | Enable Input | Active-high logic input (1.18 V threshold); pulls SS low when disabled to prevent output rise. |
| RON | ON-Time Programming | Resistor sets ON-time duration and thus switching frequency; inverse relationship with VIN maintains stable fSW. |
| VCC | Internal Bias Supply | 6 V regulated output (65 mA current-limited); powers gate drivers and control circuitry; requires ≥680 nF bypass cap. |
| PGND | Power Ground | High-current return path for MOSFETs and inductor; must be low-inductance connection to EP and input/output caps. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | COT architecture eliminates external compensation network - reduces BOM count and design iteration time. |
| Stable with ceramic capacitors | ESR-independent stability enables use of low-profile, high-reliability ceramic output capacitors without damping networks. |
| Prebias start-up | Allows controlled ramp-up even when output is precharged - prevents reverse current flow into powered downstream circuits. |
| Ultra-fast transient response | Sub-microsecond ON-time adjustment enables <5% output deviation under 2.5 A/µs load steps - critical for FPGA and DSP core rails. |
| Programmable soft-start | External capacitor sets ramp time - avoids input voltage droop and inrush stress on upstream converters or connectors. |
| Output overvoltage protection | 0.92 V FB threshold triggers immediate ON-time termination - protects downstream 3.3 V or 5 V logic from fault-induced overvoltage. |
Applications
| Industrial PLC Power Supply | Automotive Telematics Module |
|---|---|
|
Use Scenario: Converts 24 VDC vehicle battery or factory bus to stable 3.3 V for microcontroller, CAN transceiver, and GPS receiver. IC Role / Device Role / Timing Role: Primary point-of-load regulator providing isolated, ripple-controlled 3.3 V rail with fast load-step recovery. Use Value: Maintains system uptime during engine cranking (input dips to 6 V) and handles 2.5 A burst loads from cellular modem transmission without brownout. |
Use Scenario: Powers infotainment head unit subsystems including display interface, audio codec, and Bluetooth/Wi-Fi SoC from 12 V battery. IC Role / Device Role / Timing Role: Synchronous buck converter delivering clean, low-noise 1.8 V and 3.3 V rails with minimal thermal footprint. Use Value: Enables compact layout with ceramic capacitors and achieves >92% efficiency at 1.5 A, reducing heatsink requirements in sealed enclosures. |
| Embedded Network Switch | Industrial Sensor Hub |
|
Use Scenario: Generates 5 V and 3.3 V rails for Ethernet PHY, switch fabric ASIC, and management MCU in DIN-rail mounted switch. IC Role / Device Role / Timing Role: High-input-voltage buck regulator supporting wide-range 24–42 V PoE+ or auxiliary supply inputs. Use Value: Delivers full 2.5 A at 42 V input with <30°C temperature rise on standard 2-layer board - eliminates need for forced air cooling. |
Use Scenario: Supplies 0.8 V to 5 V configurable rails for multi-sensor nodes (temperature, pressure, IMU) in hazardous-area monitoring systems. IC Role / Device Role / Timing Role: Adjustable-output buck regulator enabling single-BOM flexibility across sensor variants and firmware revisions. Use Value: Programmable RON and FB divider support field-configurable outputs; DCM mode extends battery life in wireless sensor edge nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5115MH/NOPB | Higher 75-V input rating; external MOSFET drive; no integrated power stage. | Used where >42 V input or >5 A output is needed; requires more external components and layout effort. | Select when input exceeds 42 V or thermal/power scalability beyond 2.5 A is required. |
| TPS54229EDDAR | 2.95–6 V input range; 2-A output; integrated 22-mΩ/52-mΩ MOSFETs; fixed 500-kHz fSW. | Targeted at low-input-voltage applications like USB-powered devices; not suitable for 12/24/42 V systems. | Choose only for sub-6 V input designs where smaller size and lower quiescent current outweigh input range limitations. |
Compared with LM3102MH/NOPB, LM5115MH/NOPB offers extended input voltage and external FET flexibility but increases design complexity, while TPS54229EDDAR provides lower IQ and smaller footprint at the cost of incompatible input range - making LM3102MH/NOPB the optimal choice for 4.5–42 V, 2.5-A industrial and automotive point-of-load applications.
Availability
LM3102MH/NOPB is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive telematics modules, embedded network switches, and industrial sensor hubs requiring stable component supply and long-term manufacturability.
Supply support for LM3102MH/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 ICs, with leadership in high-reliability industrial and automotive power solutions.
The LM3102 product line delivers highly integrated synchronous buck regulators targeting space-constrained, high-input-voltage applications in harsh environments - designed to simplify power design while maintaining robust thermal and fault protection.
FAQ
What is the maximum input voltage supported by the LM3102MH/NOPB?
The LM3102MH/NOPB supports a maximum input voltage of 42 V, with absolute maximum ratings extending to 43.5 V for short transients. This allows direct integration into 24 VDC industrial systems and 12/24 VAC rectified supplies. Operation above 42 V risks exceeding recommended operating conditions and may trigger VCC UVLO or thermal shutdown. Always maintain VIN within 4.5 V to 42 V for guaranteed performance and reliability of the LM3102MH/NOPB.
Does the LM3102MH/NOPB require external compensation components?
No, the LM3102MH/NOPB uses a Constant ON-Time (COT) control architecture that eliminates the need for external loop compensation components such as type-II or type-III networks. Its stability is inherently independent of output capacitor ESR, enabling robust operation with ceramic capacitors alone. This simplifies layout, reduces bill-of-materials count, and accelerates design validation - a core advantage confirmed in the LM3102MH/NOPB datasheet Section 7.3.1.
Can the LM3102MH/NOPB start up into a prebiased output?
Yes, the LM3102MH/NOPB supports prebias start-up, allowing it to safely ramp the output voltage even when the output rail is initially charged to a non-zero voltage. During prebias operation, the synchronous MOSFET remains off until the FB voltage drops below the 0.8 V reference, preventing reverse current flow. This behavior is explicitly documented in the LM3102MH/NOPB datasheet Section 7.1 and ensures reliable power sequencing in complex multi-rail systems.
What package type is used for the LM3102MH/NOPB?
The LM3102MH/NOPB is packaged in the thermally enhanced HTSSOP-20 (PWP) package, measuring 6.50 mm × 4.40 mm with an exposed thermal pad (EP). This package provides superior thermal performance compared to the DSBGA variant, supporting full 2.5 A output current with appropriate PCB copper area. The pinout and thermal characteristics are fully specified in the LM3102MH/NOPB datasheet Section 5 and Section 6.4.
How is the switching frequency programmed on the LM3102MH/NOPB?
The switching frequency of the LM3102MH/NOPB is programmed using an external resistor (RON) connected between the RON pin and AGND. The ON-time varies inversely with input voltage, yielding nearly constant frequency across line variations. For example, with RON = 100 kΩ and VIN = 18 V, fSW ≈ 1 MHz. The LM3102MH/NOPB datasheet Equation 5 and Figure 4 provide exact relationships - ensuring predictable frequency setting without trimming or calibration.
LM3102MH/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):
- 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
LM3102MH/NOPB FAQ
1.How can I place an order for LM3102MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3102MH/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 LM3102MH/NOPB reliable?
The price and inventory of LM3102MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3102MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3102MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3102MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3102MH/NOPB?
LM3102MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3102MH/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 LM3102MH/NOPB?
For technical support, including LM3102MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3102MH/NOPB requirements.
6.How does Aetrix verify that LM3102MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3102MH/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 LM3102MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3102MH/NOPB?
All LM3102MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3102MH/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 LM3102MH/NOPB part is unused and in its original packaging.
Return procedure for LM3102MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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