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Texas Instruments LM2731YMFX/NOPB
- Part No.:
- LM2731YMFX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2731YMFX/NOPB.pdf
- Description:
- IC REG BOOST ADJ 1.8A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,031
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Product details
Overview
LM2731YMFX/NOPB from Texas Instruments is a 0.6-MHz fixed-frequency current-mode boost converter IC with integrated 22-V, 1.8-A DMOS FET switch in 5-pin SOT-23 package. It operates from 2.7 V to 14 V input, delivers up to 20 V output, and features cycle-by-cycle current limiting and thermal shutdown - ideal for space-constrained portable power rails in digital cameras and PDAs.
For engineers reviewing the LM2731YMFX/NOPB datasheet, LM2731YMFX/NOPB pinout, LM2731YMFX/NOPB application, or LM2731YMFX/NOPB equivalent, key selection factors include its 0.6-MHz switching frequency (Y option), 1.23-V feedback reference, 300–450-mΩ RDS(ON), <1 µA shutdown current, and compatibility with tiny ceramic capacitors and 10-µH inductors.
Technical Context
The LM2731YMFX/NOPB uses peak-current-mode control with an internal ramp generator and PWM comparator comparing sensed switch current against feedback-derived error voltage. Its 0.6-MHz oscillator enables compact magnetics while maintaining stable regulation across 2.7–14-V input and load transients.
Protection includes per-cycle current limiting triggered by a sense resistor in series with the internal FET, plus thermal shutdown at ~160°C junction temperature. The FB pin regulates output via a resistive divider referenced to 1.23 V, and SHDN is active-low with <2 µA bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 0.6 MHz (Y option) - enables use of small 10-µH inductors and 4.7-µF ceramic output capacitors |
| Input Voltage Range | 2.7 V to 14 V - supports single-cell Li-ion, multi-cell alkaline, and USB-powered systems |
| Output Voltage Capability | Up to 20 V - enabled by 22-V rated internal DMOS FET switch |
| Switch Current Limit | 1.4 A to 1.8 A (−40°C to +125°C) - sets maximum deliverable load current under boost conditions |
| RDS(ON) | 300–450 mΩ (TJ = 25°C) - determines conduction loss and thermal rise at full load |
| Feedback Reference Voltage | 1.205 V to 1.255 V (−40°C to +125°C) - defines precision of output voltage setting via external resistor divider |
| Shutdown Current | <1 µA - extends battery life in standby mode for portable devices |
Pinout & Package
LM2731YMFX/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm with standard lead pitch and thermal pad-compatible footprint. The package supports high power density and efficient PCB heat dissipation via bottom-side copper exposure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Drain | Connection to internal 22-V DMOS FET drain; routes pulsed current to external inductor and Schottky diode |
| GND (Pin 2) | Analog & Power Ground | Common return for feedback, control logic, and power path; must be low-impedance and star-connected |
| FB (Pin 3) | Feedback Input | Senses output voltage via resistive divider; regulates output to 1.23 V reference with ±25 mV tolerance over temperature |
| SHDN (Pin 4) | Active-Low Enable | Pulls low to disable switching; requires pull-up to VIN if unused; max bias current 2 µA |
| VIN (Pin 5) | Power Input | Supplies internal circuitry and switch driver; accepts 2.7–14 V with transient rating up to 14.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 22-V, 1.8-A DMOS FET | Eliminates external high-voltage switch; enables 5-V-to-12-V or 3.3-V-to-18-V boost without discrete MOSFET |
| 0.6-MHz fixed-frequency operation | Reduces EMI filtering burden vs lower frequencies; allows smaller passive components than 100-kHz converters |
| Cycle-by-cycle current limiting | Protects internal FET during overload or short-circuit; responds within one switching cycle without latch-off |
| Internally compensated control loop | Requires only feedforward capacitor (CF) for stability - no external compensation network needed |
| Low shutdown current (<1 µA) | Minimizes battery drain in always-on portable systems; supports rapid wake-up without soft-start delay |
Applications
| White LED Backlighting | Digital Camera Power Rail |
|---|---|
Use Scenario: Driving 3–4串联 white LEDs from a single 3.3-V Li-ion cell in compact camera modules. IC Role / Device Role / Timing Role: Boost converter providing regulated 12–15 V output with current-mode control for stable LED current. Use Value: Enables consistent brightness across battery discharge; 0.6-MHz switching avoids audible noise in image sensor vicinity. |
Use Scenario: Generating 5-V and 12-V rails for CCD/CMOS sensor bias, flash charging, and ISP logic from 3.3-V system supply. IC Role / Device Role / Timing Role: Primary boost regulator delivering up to 500 mA at 12 V with fast transient response to burst-mode sensor loads. Use Value: 1.8-A switch current and 22-V rating support high-voltage flash capacitor charging without external FET. |
| PDA/System-on-Module Local Boost | Portable Audio Codec Supply |
Use Scenario: Providing clean 5-V local supply for SD card interface or USB PHY on battery-powered handhelds. IC Role / Device Role / Timing Role: Compact, low-noise boost stage placed near load to minimize IR drop and EMI coupling. Use Value: SOT-23 footprint and ceramic-capacitor compatibility reduce board area by >40% vs legacy 100-kHz solutions. |
Use Scenario: Generating 12-V analog supply for audio DAC/ADC reference and op-amp rails in Bluetooth headsets. IC Role / Device Role / Timing Role: Efficient, low-ripple boost source with <1 µA shutdown current for extended standby time. Use Value: 1.23-V FB reference and tight line/load regulation ensure stable audio performance across battery voltage range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2731XMF/NOPB | 1.6-MHz switching frequency; higher RDS(ON) (typ. 400 mΩ); reduced max duty cycle (93% vs 93% at 25°C) | Better suited for ultra-compact designs requiring smallest inductors; trades ~2–3% efficiency for size reduction | Select when board space is critical and EMI filtering can accommodate higher fundamental frequency |
| TPS61040DRVR | Fixed 500-kHz frequency; 28-V switch; 0.5-A switch current limit; requires external compensation | Lower output current capability; needs additional RC network for loop stability; wider input range (1.8–6 V) | Prefer for sub-300-mA loads where input starts below 2.7 V or where TI's newer TPS61xxx family toolchain is standardized |
Compared with LM2731YMFX/NOPB, the LM2731XMF/NOPB offers higher switching frequency for smaller passives but lower efficiency at medium loads, while the TPS61040DRVR provides broader low-input support at the cost of reduced current capability and added design complexity.
Availability
LM2731YMFX/NOPB is available at Aetrix Electronics and suitable for portable imaging systems, handheld computing devices, and battery-powered audio equipment requiring stable component supply and long-lifecycle availability.
Supply support for LM2731YMFX/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 over 50 years of innovation in high-reliability power conversion ICs.
The LM2731 family was designed specifically for high-density portable power applications - delivering regulated boost outputs using minimal external components while maintaining robust protection and thermal performance in SOT-23 packaging.
FAQ
What is the switching frequency of the LM2731YMFX/NOPB?
The LM2731YMFX/NOPB is the Y-option variant with a nominal switching frequency of 0.6 MHz, confirmed in the Electrical Characteristics table (FSW = 0.6 MHz, "Y" Option). This frequency remains stable across −40°C to +125°C junction temperature and input voltages from 2.7 V to 14 V, enabling predictable EMI filtering and compact magnetic design.
Does the LM2731YMFX/NOPB require external compensation components?
The LM2731YMFX/NOPB is internally compensated, eliminating the need for external Type-II or Type-III compensation networks. However, a feedforward capacitor (CF) is mandatory for loop stability - typically 220 pF placed between FB and VIN per the recommended application schematic in the datasheet. Omitting CF risks oscillation or poor transient response.
What is the maximum output voltage achievable with the LM2731YMFX/NOPB?
The LM2731YMFX/NOPB supports output voltages up to 20 V, limited by its 22-V rated internal DMOS FET switch and absolute maximum SW pin voltage of 22 V. Output voltage is set externally via the FB resistive divider; for reliable operation, VOUT must remain ≥ VIN + VDIODE + VSW (typically ≥ VIN + 1 V) to maintain continuous conduction mode.
Can the LM2731YMFX/NOPB drive a white LED string directly?
The LM2731YMFX/NOPB is not a constant-current LED driver IC; it is a voltage-regulated boost converter. To drive white LEDs, it must be paired with an external current-sense resistor and feedback configuration - e.g., connecting the LED string cathode to GND and sensing current through a resistor tied to FB. Direct LED connection without current regulation risks thermal runaway and LED failure.
What thermal considerations apply to the LM2731YMFX/NOPB in SOT-23 package?
The LM2731YMFX/NOPB has RθJA = 209.9°C/W (DBV package) and thermal shutdown at ~160°C. For continuous 500-mA output at 12 V from 3.3 V input, power dissipation exceeds 0.5 W - requiring ≥250 mm² of 2-oz copper pour under the exposed pad and adjacent GND traces. Without adequate copper, junction temperature may exceed 125°C derating limits even at moderate loads.
LM2731YMFX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 22V (Switch)
- Current - Output:
- 1.8A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2731YMFX/NOPB FAQ
1.How can I place an order for LM2731YMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2731YMFX/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 LM2731YMFX/NOPB reliable?
The price and inventory of LM2731YMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2731YMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2731YMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2731YMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2731YMFX/NOPB?
LM2731YMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2731YMFX/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 LM2731YMFX/NOPB?
For technical support, including LM2731YMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2731YMFX/NOPB requirements.
6.How does Aetrix verify that LM2731YMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2731YMFX/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 LM2731YMFX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2731YMFX/NOPB?
All LM2731YMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2731YMFX/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 LM2731YMFX/NOPB part is unused and in its original packaging.
Return procedure for LM2731YMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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