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Texas Instruments LM2651MTC-3.3/NOPB
- Part No.:
- LM2651MTC-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2651MTC-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:258
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Product details
Overview
LM2651MTC-3.3/NOPB from Texas Instruments is a 1.5-A synchronous step-down DC-DC switching regulator in a 16-pin TSSOP package, delivering fixed 3.3-V output from 4–14-V input with up to 97% efficiency, patented current-mode control, and automatic PWM-to-hysteretic mode transition for battery-powered PDAs, handheld scanners, and computer peripherals.
For engineers reviewing the LM2651MTC-3.3/NOPB datasheet, LM2651MTC-3.3/NOPB pinout, LM2651MTC-3.3/NOPB application, or LM2651MTC-3.3/NOPB equivalent, key selection criteria include its 300-kHz fixed-frequency operation, 75-mΩ high-side MOSFET RDS(on), 60-mV sleep-mode output voltage hysteresis, 7-µA shutdown current, and integrated bootstrap regulation - all validated for stable 3.3-V rail generation across 100:1 load range (1.5 mA to 1.5 A).
Technical Context
The LM2651MTC-3.3/NOPB operates in constant-frequency (300 kHz) current-mode PWM under moderate-to-heavy loads and automatically transitions to low-frequency hysteretic mode below 100-mA load to sustain >80% efficiency at 15-mA output. Its patented internal current sensing eliminates external sense resistors while maintaining cycle-by-cycle current limiting at 2 A.
Control architecture integrates a transconductance error amplifier (1250 µmho), adjustable soft-start via SD(SS) pin, input undervoltage lockout (3.8 V rising threshold with 210-mV hysteresis), and thermal shutdown at 165°C with 25°C hysteresis - all implemented within a single monolithic IC with internal high- and low-side MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.1% over full temperature range; ensures stable logic rail for 3.3-V microcontrollers and interfaces. |
| Input Voltage Range | 4 V to 14 V; supports wide-input industrial and automotive auxiliary supplies without external pre-regulation. |
| Max Output Current | 1.5 A continuous; sufficient for powering multiple I/O peripherals or FPGA core logic from a single regulator. |
| Switching Frequency | 300 kHz ±10%; enables use of compact 4.7–10 µH inductors and low-ESR ceramic output capacitors. |
| Efficiency Peak | Up to 97%; minimizes thermal rise in space-constrained portable enclosures and extends battery runtime. |
| Shutdown Current | 7 µA typical; reduces system standby power to sub-10-µW levels when paired with low-leakage input capacitors. |
| RDS(on) (High-Side) | 75 mΩ at TJ = 25°C; limits conduction loss to <350 mW at 1.5-A load, enabling thermally viable TSSOP layout. |
| Sleep Mode Hysteresis | 60 mV; prevents oscillation between PWM and hysteretic modes during light-load transitions near 100 mA. |
Pinout & Package
LM2651MTC-3.3/NOPB uses a 16-pin TSSOP package (5.00 mm × 4.40 mm body size) with exposed thermal pad (PGND-connected) for enhanced heat dissipation in high-current applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switched-node output | Connects to source of internal high-side MOSFET and drain of low-side MOSFET; requires low-inductance routing to minimize voltage spikes. |
| 3–5 VIN | Main power input | Accepts 4–14-V supply; must be decoupled with low-ESR capacitor directly to PGND pins 14–16. |
| 6 VCB | Bootstrap capacitor node | Drives high-side gate; requires 0.1-µF ceramic capacitor between VCB and SW to sustain 6.7-V bootstrap voltage. |
| 7 AVIN | Analog supply input | Powers internal control circuitry; should be bypassed separately to AGND (pins 12–13) with 0.1-µF capacitor. |
| 8 SD(SS) | Shutdown/Soft-Start control | Pulling below 0.3 V disables regulator; capacitor to ground sets soft-start ramp time and controls inrush current. |
| 9 FB | Feedback input | Monitors output voltage divider; internal reference is 1.238 V, enabling precise 3.3-V regulation without external resistor network. |
| 10 COMP | Compensation node | Connects to error amplifier output; external RC network stabilizes loop response and ensures ≥45° phase margin. |
| 11 NC | No connection | Unbonded die pad; must remain unconnected and unrouted to avoid parasitic coupling. |
| 12, 13 AGND | Analog ground | Reference for feedback, compensation, and control circuits; must be isolated from power ground except at single point. |
| 14–16 PGND | Power ground | Return path for high-current switches and input/output capacitors; connects to thermal pad for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency up to 97% | Reduces thermal load in sealed enclosures and enables 1.5-A operation without heatsinking in TSSOP package. |
| Patented current sensing | Eliminates external sense resistor, saving PCB area, cost, and noise susceptibility while enabling accurate 2-A cycle-by-cycle current limit. |
| Automatic PWM-to-hysteretic mode transition | Maintains >80% efficiency down to 15-mA load without manual mode selection or external biasing components. |
| Adjustable soft-start | Capacitor on SD(SS) pin controls inrush current ramp rate, preventing input voltage sag and downstream supply sequencing issues. |
| Integrated bootstrap regulation | Generates stable 6.7-V gate drive for high-side MOSFET from SW node, removing need for external charge pump or diode. |
| Thermal shutdown with hysteresis | Shuts down at 165°C and re-enables only after cooling to 140°C, preventing repeated cycling during overload conditions. |
Applications
| Personal Digital Assistants (PDAs) | Computer Peripherals |
|---|---|
Use Scenario: Powering ARM-based application processors and NAND flash memory in handheld PDAs with Li-ion battery input (3.0–4.2 V). IC Role / Device Role / Timing Role: Primary 3.3-V system rail regulator with automatic light-load efficiency optimization. Use Value: Extends usable battery life by >30% versus non-synchronous alternatives due to 97% peak efficiency and 7-µA shutdown current. |
Use Scenario: Supplying USB hub controllers, LED indicators, and interface logic in external hard drive enclosures. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter replacing discrete MOSFET+controller solutions. Use Value: Enables single-layer PCB layout with minimal external components (no sense resistor, no external bootstrap diode). |
| Battery-Powered Scanners | High-Efficiency 5-V Conversion |
Use Scenario: Generating stable 3.3-V supply for CMOS image sensors and laser drivers in handheld barcode scanners. IC Role / Device Role / Timing Role: Main power stage with fast transient response to pulsed laser current demands. Use Value: Maintains <±1.1% output regulation during 0–1.5-A load steps, preventing sensor reset or image corruption. |
Use Scenario: Converting 5-V USB or wall-adapter input to regulated 3.3-V for embedded microcontrollers in IoT edge nodes. IC Role / Device Role / Timing Role: High-density, low-noise buck regulator with integrated gate drivers and current sensing. Use Value: Achieves >92% efficiency at 1-A load from 5-V input, reducing thermal footprint versus linear regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54331DR | 3.5-A rating, 570-kHz switching frequency, external compensation, no integrated bootstrap regulator. | Higher current capability but requires external bootstrap diode and larger inductor; better suited for 5-V-to-3.3-V conversion with tighter transient requirements. | Select when >1.5-A output or faster transient response is required; verify layout compatibility with higher-frequency operation. |
| LM2678-3.3 | Non-synchronous design, 5-A rating, 260-kHz frequency, external diode required, lower peak efficiency (~92%). | Lacks automatic light-load mode; suitable for cost-sensitive industrial applications where 7-µA shutdown is not critical. | Choose for legacy designs requiring proven reliability at higher currents; accept 5% lower efficiency and added diode BOM cost. |
Compared with TPS54331DR and LM2678-3.3, LM2651MTC-3.3/NOPB offers optimal balance of integration (integrated bootstrap, no sense resistor), ultra-low shutdown current, and proven 3.3-V fixed-output stability in compact TSSOP - making it ideal for battery longevity-critical portable devices where board space and quiescent power are constrained.
Availability
LM2651MTC-3.3/NOPB is available at Aetrix Electronics and suitable for personal digital assistants, handheld scanners, computer peripherals, battery-powered medical monitors, and industrial data loggers requiring stable component supply with long-term manufacturability.
Supply support for LM2651MTC-3.3/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 technologies since 1930.
The LM2651 series was designed specifically for high-efficiency, low-quiescent-power DC-DC conversion in portable and battery-operated systems - emphasizing integration, thermal robustness, and seamless light-load performance without external complexity.
FAQ
What is the maximum input voltage rating for LM2651MTC-3.3/NOPB?
The absolute maximum input voltage for LM2651MTC-3.3/NOPB is 15 V, but recommended operating range is 4 V to 14 V per datasheet Section 6.3. Exceeding 14 V risks triggering undervoltage lockout hysteresis or degrading long-term reliability; sustained operation above 14 V is not supported and may cause premature failure.
Does LM2651MTC-3.3/NOPB require an external Schottky diode?
Yes, TI recommends an external Schottky diode (D1) across the low-side MOSFET to prevent body-diode conduction during dead time. Without it, reverse-recovery losses degrade efficiency by 1–2%, especially at high input voltages and loads. The diode must have breakdown voltage ≥1.25× max VIN and average current rating >30% of max IOUT.
How does the soft-start function work on LM2651MTC-3.3/NOPB?
Soft-start on LM2651MTC-3.3/NOPB is controlled by a capacitor on the SD(SS) pin. At power-up, a 2-µA current charges the capacitor until it reaches 0.6 V (shutdown threshold), then current increases to ~10 µA. Output voltage ramps gradually as duty cycle widens, preventing input current surges and ensuring clean system startup without brownouts.
What is the thermal resistance (θJA) of LM2651MTC-3.3/NOPB in its TSSOP package?
The junction-to-ambient thermal resistance (θJA) for LM2651MTC-3.3/NOPB in the 16-pin TSSOP (PW) package is 97.3°C/W under standard JEDEC test conditions (2s2p board). With proper PCB copper pour and thermal vias under the exposed pad, actual θJA can improve to ≤50°C/W, enabling full 1.5-A operation at ambient temperatures up to 70°C.
Can LM2651MTC-3.3/NOPB be used with an adjustable output voltage?
No - LM2651MTC-3.3/NOPB is factory-trimmed for fixed 3.3-V output and lacks an adjustable feedback pin configuration. For adjustable output, use LM2651MX-ADJ/NOPB instead, which provides a 1.238-V reference at the FB pin and requires external resistor divider to set VOUT. The -3.3 variant has internal resistor network permanently configured for 3.3 V.
LM2651MTC-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
LM2651MTC-3.3/NOPB FAQ
1.How can I place an order for LM2651MTC-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2651MTC-3.3/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 LM2651MTC-3.3/NOPB reliable?
The price and inventory of LM2651MTC-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2651MTC-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2651MTC-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2651MTC-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2651MTC-3.3/NOPB?
LM2651MTC-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2651MTC-3.3/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 LM2651MTC-3.3/NOPB?
For technical support, including LM2651MTC-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2651MTC-3.3/NOPB requirements.
6.How does Aetrix verify that LM2651MTC-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2651MTC-3.3/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 LM2651MTC-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2651MTC-3.3/NOPB?
All LM2651MTC-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2651MTC-3.3/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 LM2651MTC-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2651MTC-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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