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Texas Instruments LM3103MH/NOPB
- Part No.:
- LM3103MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM3103MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 750MA 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:419
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Product details
Overview
LM3103MH/NOPB from Texas Instruments is a synchronous step-down DC-DC voltage regulator IC delivering 0.75 A output current with input voltage range 4.5 V to 42 V, 0.6 V ±2% internal reference, and integrated dual N-channel MOSFETs in HTSSOP-16 package - used in industrial control, automotive body electronics, and point-of-load conversion from 12/24 VDC rails.
For engineers reviewing the LM3103MH/NOPB datasheet, LM3103MH/NOPB pinout, LM3103MH/NOPB application, or LM3103MH/NOPB equivalent, key selection criteria include its constant-on-time (COT) control architecture, no-loop-compensation design, ceramic-capacitor compatibility, programmable switching frequency up to 1 MHz, and valley-current-limit protection at 0.9 A.
Technical Context
The LM3103MH/NOPB implements a Constant ON-Time (COT) regulation scheme using an internal 0.6 V reference and comparator-driven one-shot timer, eliminating need for external loop compensation. Its on-time is inversely proportional to input voltage and set by external RON, enabling near-constant switching frequency across line variations.
It integrates dual N-channel MOSFETs (RDS(on) = 0.37 Ω main / 0.22 Ω sync), supports DCM/CCM operation, features zero-coil-current detection for light-load efficiency, and includes OVP (0.68 V FB threshold), thermal shutdown (165 °C), and pre-bias startup capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - enables direct regulation from 5/12/24 VDC and 2–4 cell Li-ion battery systems without pre-regulation. |
| Output Current | 0.75 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Reference Voltage | 0.6 V ±2% - sets minimum adjustable output voltage and defines feedback accuracy for stable regulation. |
| Switching Frequency | Up to 1 MHz (programmable via RON) - allows compact magnetics and high transient response while avoiding AM radio band. |
| Main MOSFET RDS(on) | 0.37 Ω (typ) - reduces conduction loss at full load, supporting >90% peak efficiency at 3.3 V/0.75 A. |
| Current Limit Threshold | 0.9 A valley detection - provides overcurrent protection without external sensing, limiting fault energy during short-circuit events. |
| Soft-Start Current | 70 µA (typ) - charges external capacitor to control ramp rate of output voltage, preventing inrush current into downstream capacitance. |
Pinout & Package
LM3103MH/NOPB is housed in a thermally enhanced HTSSOP-16 package (5.00 mm × 4.40 mm) with exposed thermal pad (DAP/EP) requiring connection to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2) | Input supply rail | Accepts 4.5–42 V; powers internal startup regulator (VCC) and gate drivers; requires local bulk capacitance. |
| SW (Pins 3,4) | Switch node | Connects to inductor; carries high di/dt switching waveform; must be routed with minimal loop area for EMI control. |
| BST (Pin 5) | Bootstrap supply | Connects 33 nF ceramic capacitor to SW; supplies floating gate drive voltage for high-side N-MOSFET. |
| AGND (Pin 6) | Analog ground reference | Ground return for feedback, reference, and control circuitry; must be star-connected to PGND at single point. |
| SS (Pin 7) | Soft-start control | 70 µA current source charges external capacitor; controls output voltage ramp time and prevents startup overshoot. |
| NC (Pin 8) | No connection | Internally unconnected; must remain floating - no routing or soldering allowed. |
| GND (Pins 9,10) | Digital ground reference | Must be externally tied to AGND; not internally connected - ensures clean separation of analog/digital returns. |
| FB (Pin 11) | Feedback input | Monitors output via resistor divider; regulates to 0.6 V; bias current <1 nA enables high-impedance divider networks. |
| EN (Pin 12) | Enable control | Active-high (1.6 V threshold); internal pull-up allows default-enable operation; supports remote power sequencing. |
| RON (Pin 13) | On-time programming | Resistor from VIN sets main MOSFET on-time; determines operating frequency and minimum duty cycle. |
| VCC (Pin 14) | Startup regulator output | 6 V ±0.2 V regulated output; powers internal circuitry; requires ≥1 µF low-ESR ceramic capacitor to ground. |
| PGND (Pins 15,16) | Power ground return | Source connection for synchronous MOSFET; carries high pulsed current; must connect directly to ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Constant ON-Time (COT) Control | Eliminates need for external compensation components, simplifies layout, and delivers ultra-fast load transient response (<10 µs recovery). |
| Ceramic Capacitor Stability | Stable operation with zero-ESR ceramic output capacitors - removes dependency on aluminum or tantalum caps and reduces solution size. |
| Integrated Dual N-Channel MOSFETs | Reduces BOM count by two discrete switches and associated gate drivers; improves efficiency and thermal coupling in HTSSOP-16 package. |
| Pre-bias Startup | Allows safe start-up into pre-charged output rails without reverse current flow - critical for hot-swap and multi-rail sequencing applications. |
| Valley Current Limit Protection | Detects inductor current during synchronous FET conduction phase, enabling accurate 0.9 A current limit without sense resistors or secondary windings. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powering isolated CAN transceivers, ADCs, and digital I/O drivers from 24 VDC field bus. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 24 V to 3.3 V/5 V with high noise immunity and wide input tolerance. Use Value: Enables robust operation across 18–32 V input range and withstands load dump transients up to 42 V without derating. |
Use Scenario: Supplying microcontroller core voltage and sensor interfaces in door module or lighting control unit. IC Role / Device Role / Timing Role: Synchronous buck converter providing 0.75 A at 1.2 V or 3.3 V from vehicle battery (9–16 V nominal). Use Value: Delivers >88% efficiency at 100 mA (DCM) and >92% at full load, reducing thermal stress in sealed enclosures. |
| Telecom Remote Radio Unit | Storage System Fan Controller |
|
Use Scenario: Generating 5 V for FPGA configuration and 3.3 V for SerDes interfaces in outdoor base station equipment. IC Role / Device Role / Timing Role: High-reliability DC-DC stage supporting -40°C to +125°C junction temperature operation. Use Value: Thermal shutdown (165 °C) and overvoltage protection (0.68 V FB threshold) prevent latch-up during ambient temperature excursions. |
Use Scenario: Regulating 12 V fan supply from server backplane rail with dynamic speed control via PWM input. IC Role / Device Role / Timing Role: Efficient intermediate regulator feeding linear fan driver; supports soft-start to avoid mechanical jerk at power-on. Use Value: Programmable soft-start (via SS pin) eliminates audible coil whine and extends fan bearing life during repeated cycling. |
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 COT architecture but rated for 1.2 A output and higher RDS(on) (0.45 Ω main / 0.28 Ω sync); shares identical pinout and feature set. | Supports higher current loads (e.g., multi-core MCU domains) but with ~3% lower peak efficiency at 0.75 A due to higher conduction loss. | Select when future-proofing for >0.75 A or when board layout re-use is prioritized over marginal efficiency gain. |
| TPS54302DDCR | Current-mode PWM controller (not COT); 3 A rating; requires external compensation; 0.6 V reference; 4.5–28 V input. | Better light-load efficiency in PFM mode but slower transient response (>20 µs); larger solution size due to compensation network. | Choose when strict EMI requirements favor fixed-frequency operation or when existing designs already use TI's WEBENCH-compatible PWM controllers. |
Compared with LM3103MH/NOPB, LM3102MH/NOPB offers higher current headroom with identical footprint and control behavior, while TPS54302DDCR trades COT's simplicity and speed for greater flexibility in loop tuning and light-load optimization - making LM3103MH/NOPB optimal for space-constrained, fast-transient industrial and automotive point-of-load designs.
Availability
LM3103MH/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive telematics, and broadband infrastructure applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3103MH/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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM3103MH/NOPB belongs to TI's synchronous buck regulator product line designed for cost-sensitive, high-efficiency point-of-load applications in harsh environments - emphasizing integration, thermal robustness, and ease of implementation.
FAQ
What is the maximum input voltage supported by the LM3103MH/NOPB?
The LM3103MH/NOPB supports a maximum input voltage of 42 V, verified per Absolute Maximum Ratings in the official datasheet (SNVS523G). This rating allows direct operation from 24 VDC industrial buses and automotive systems experiencing load dump conditions. Operation above 42 V risks permanent damage, and the device incorporates VCC UVLO (3.7 V threshold) to disable switching if input drops below safe startup level.
Does the LM3103MH/NOPB require external compensation components?
No, the LM3103MH/NOPB uses a Constant ON-Time (COT) control architecture that eliminates the need for external compensation components such as type-II or type-III networks. Its stability is inherently achieved through the feedback comparator and one-shot timer, enabling reliable operation with ceramic output capacitors and simplifying PCB layout - a confirmed feature documented in Sections 7.2.1 and 8.1.1 of the SNVS523G datasheet.
Can the LM3103MH/NOPB start up into a pre-biased output?
Yes, the LM3103MH/NOPB supports pre-bias startup, meaning it can safely begin regulation when the output voltage is already present (e.g., from another power rail or hold-up capacitor). This behavior is explicitly stated in the Features list and Section 7.2.1 of the datasheet, preventing reverse current flow and ensuring controlled ramp-up even when VOUT > 0 V at enable assertion.
What package type and thermal characteristics does the LM3103MH/NOPB use?
The LM3103MH/NOPB is packaged in the HTSSOP-16 (PWP) variant with a 5.00 mm × 4.40 mm body and exposed thermal pad (DAP). Its junction-to-ambient thermal resistance (RθJA) is 35 °C/W under standard JEDEC conditions, and it includes thermal shutdown activation at 165 °C with 20 °C hysteresis - all confirmed in Sections 5 and 6.4 of the SNVS523G datasheet.
How is the switching frequency programmed on the LM3103MH/NOPB?
The LM3103MH/NOPB switching frequency is programmed via an external resistor (RON) connected between the VIN and RON pins. The on-time varies inversely with input voltage, yielding near-constant frequency up to 1 MHz. Equation (2) in Section 7.2.1 of the datasheet gives fSW ≈ 8.3×10⁻¹¹ × RON / [(VIN ± VOUT) × RON], with minimum on-time limiting maximum frequency to ~1 MHz at VIN(MAX).
LM3103MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-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):
- 0.6V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 750mA
- Frequency - Switching:
- Up to 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM3103MH/NOPB FAQ
1.How can I place an order for LM3103MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3103MH/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 LM3103MH/NOPB reliable?
The price and inventory of LM3103MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3103MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM3103MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3103MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3103MH/NOPB?
LM3103MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3103MH/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 LM3103MH/NOPB?
For technical support, including LM3103MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3103MH/NOPB requirements.
6.How does Aetrix verify that LM3103MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3103MH/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 LM3103MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM3103MH/NOPB?
All LM3103MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3103MH/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 LM3103MH/NOPB part is unused and in its original packaging.
Return procedure for LM3103MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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