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Texas Instruments LM2731YMF/NOPB
- Part No.:
- LM2731YMF/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2731YMF/NOPB.pdf
- Description:
- IC REG BOOST ADJ 1.8A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:507
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Product details
Overview
LM2731YMF/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, 1.23-V feedback reference, and logic-level shutdown control - designed for compact, high-efficiency DC-DC voltage boosting in portable battery-powered systems requiring up to 20-V output from 2.7–14-V input.
For engineers reviewing the LM2731YMF/NOPB datasheet, LM2731YMF/NOPB pinout, LM2731YMF/NOPB application, or LM2731YMF/NOPB equivalent, key selection criteria include switching frequency (0.6 MHz), internal FET RDS(ON) (typ. 300 mΩ), thermal shutdown threshold (160°C), cycle-by-cycle current limiting, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM2731YMF/NOPB implements peak-current-mode control using an internal ramp generator and PWM comparator, where the FB pin regulates output via a resistive divider and the SW pin drives an external inductor-diode stage. Its 0.6-MHz oscillator enables use of small 10-µH inductors and ceramic capacitors while maintaining stable regulation across 2.7–14-V input range.
Protection includes per-cycle current limiting triggered by the internal sense FET, thermal shutdown at 160°C junction temperature, and <1 µA shutdown quiescent current. The device requires no external compensation beyond the feedforward capacitor (CF) for loop stability, simplifying design for local boost and LED bias applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 0.6 MHz - enables compact 10-µH inductors and low-ESR ceramic capacitors; reduces solution footprint vs lower-frequency boosters. |
| Input Voltage Range | 2.7 V to 14 V - supports single-cell Li-ion (3.0–4.2 V), dual-cell alkaline (2.7–3.6 V), and wide-input industrial rails. |
| Internal Switch Rating | 22-V drain-source breakdown, 1.8-A peak current - allows regulated outputs up to 20 V with margin; eliminates external MOSFET. |
| Feedback Reference | 1.230 V ±25 mV (−40°C to +125°C) - sets output voltage via external resistor divider; enables precise 5 V, 12 V, or 18 V generation. |
| RDS(ON) | 300 mΩ typ. at TJ = 25°C - minimizes conduction loss at full load; contributes to >86% efficiency at 500 mA output (VIN = 5 V → VOUT = 12 V). |
| Shutdown Current | <1 µA - extends battery life in standby mode; SHDN pin active-low with 0.5 V turn-off threshold. |
| Thermal Shutdown | 160°C junction activation - protects against sustained overload or poor PCB thermal design; auto-recovery at ~150°C. |
Pinout & Package
LM2731YMF/NOPB is housed in a 5-pin SOT-23 package (1.60 mm × 2.90 mm body size) with exposed pad not electrically connected. Thermal resistance is RθJA = 209.9°C/W (JEDEC standard board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Drain Output | Connects to inductor and Schottky diode anode; carries pulsed 1.8-A peak current; voltage swings from GND to up to 22 V. |
| GND (Pin 2) | Analog & Power Ground | Common return for FB, SHDN, and internal circuitry; must be low-impedance connection to minimize noise and ensure regulation accuracy. |
| FB (Pin 3) | Feedback Input | Senses output voltage via resistive divider; regulates output by comparing to 1.23-V internal reference; bias current ≤500 nA. |
| SHDN (Pin 4) | Shutdown Control | Active-low enable; pulls below 0.5 V to disable switching and reduce IQ to <1 µA; tie to VIN if unused (no pull-up required). |
| VIN (Pin 5) | Power Input | Supplies internal circuitry and switch driver; accepts 2.7–14 V; requires local 2.2-µF ceramic bypass capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 22-V/1.8-A DMOS FET | Eliminates external switch and gate driver; supports 20-V output with headroom; reduces BOM count and layout complexity. |
| 0.6-MHz Fixed Switching Frequency | Enables use of miniature 10-µH inductors and 4.7-µF ceramic output capacitors; improves transient response over lower-frequency alternatives. |
| Cycle-by-Cycle Current Limiting | Protects internal FET during overload or short-circuit events by terminating each switching pulse when peak current exceeds threshold. |
| Internally Compensated Architecture | Requires only one external feedforward capacitor (CF) for stability; avoids complex Type-II/III compensation network design. |
| Logic-Level Shutdown with <1 µA IQ | Permits direct interfacing with microcontroller GPIO; extends battery runtime in sleep modes without external level-shifting. |
Applications
| White LED Backlighting | Portable Audio Amplifier Supply |
|---|---|
|
Use Scenario: Driving 3–6串联 white LEDs (3.0–3.6 V each) from a single 3.7-V Li-ion cell in Bluetooth headphones or portable speakers. IC Role / Device Role / Timing Role: Boost converter providing regulated 12–18 V output to constant-current LED driver IC; operates continuously at 0.6 MHz for low EMI. Use Value: Enables high-brightness LED operation without battery sag; 86% efficiency at 500 mA maintains runtime; SOT-23-5 fits tight acoustic module layouts. |
Use Scenario: Generating 5 V or 9 V local supply for Class D audio amplifier ICs in handheld gaming devices powered by 3.3 V or 3.7 V sources. IC Role / Device Role / Timing Role: Local boost regulator delivering clean, low-noise rail independent of main system voltage; uses internal compensation for fast load-step response. Use Value: Prevents audio distortion during dynamic peaks; <1 µA shutdown current preserves battery between game sessions; small footprint avoids routing conflicts near RF sections. |
| Digital Camera Flash Charging | PDA/System Local Boost Rail |
|
Use Scenario: Charging high-voltage capacitor (≥200 V) for xenon flash via charge-pump stages, where LM2731YMF/NOPB supplies intermediate 12–15 V rail. IC Role / Device Role / Timing Role: Primary boost stage stepping up battery voltage to feed subsequent voltage-multiplier circuits; operates at 0.6 MHz to minimize inductor size in slim camera modules. Use Value: Achieves rapid flash recharge (<2 s) with minimal board area; 22-V switch rating ensures safe margin during capacitor charging transients. |
Use Scenario: Providing isolated 5 V or 12 V supply for USB peripherals, SD card interfaces, or display drivers in legacy PDAs and industrial handheld terminals. IC Role / Device Role / Timing Role: Dedicated local boost regulator decoupled from main PMIC; delivers stable output despite varying main rail conditions (e.g., battery discharge). Use Value: Improves system reliability by preventing brownouts on sensitive peripherals; thermal shutdown protects against sustained overloads during hot-plug events. |
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) (450 mΩ max); identical pinout and FB reference. | Better suited for ultra-compact designs needing smallest inductors; lower efficiency at high load due to increased switching loss. | Select LM2731XMF/NOPB when board space is critical and load current ≤300 mA; LM2731YMF/NOPB preferred for higher efficiency above 400 mA. |
| TPS61040DRVR | Fixed 500-kHz frequency; 28-V switch; 0.5-A switch current limit; different pinout (6-pin WSON); requires external compensation. | Lower peak current capability limits output power; smaller package but needs additional compensation components. | Choose TPS61040DRVR only if 0.5-A output suffices and WSON-6 thermal performance is acceptable; LM2731YMF/NOPB offers higher power density and simpler design. |
Compared with LM2731XMF/NOPB, the LM2731YMF/NOPB trades higher efficiency and lower thermal stress for larger passive components; versus TPS61040DRVR, it delivers 3.6× higher switch current in the same footprint with no external compensation - making it optimal for mid-power portable boost applications demanding reliability and design simplicity.
Availability
LM2731YMF/NOPB is available at Aetrix Electronics and suitable for portable medical monitors, handheld test equipment, and battery-powered IoT edge nodes requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM2731YMF/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 and embedded processing technologies, with decades of expertise in power management IC design and high-volume manufacturing.
The LM2731 product line delivers highly integrated, thermally robust boost converters optimized for space-constrained, battery-operated portable electronics - emphasizing minimal external components, predictable thermal behavior, and seamless integration into compact PCB layouts.
FAQ
What is the maximum output voltage achievable with the LM2731YMF/NOPB?
The LM2731YMF/NOPB features a 22-V internal DMOS FET switch with 20-V absolute maximum SW pin voltage rating. When configured with appropriate external components (e.g., 20-V Schottky diode, 25-V output capacitor), it reliably generates regulated outputs up to 20 V - sufficient for white LED strings, LCD bias rails, and sensor excitation circuits. Exceeding 20 V risks FET breakdown and permanent damage.
Does the LM2731YMF/NOPB require external compensation components?
The LM2731YMF/NOPB uses internal compensation for its current-mode control loop, eliminating the need for external Type-II or Type-III networks. However, a feedforward capacitor (CF, typically 220 pF) between FB and VIN is mandatory for stability - as specified in TI's application schematic. Omitting CF causes oscillation and regulation failure, even though no compensation resistors or capacitors beyond CF are required.
Can the LM2731YMF/NOPB operate with a 2.5-V input supply?
No - the LM2731YMF/NOPB has a minimum recommended input voltage of 2.7 V per its Absolute Maximum Ratings and Recommended Operating Conditions. At 2.5 V, the internal bias circuitry fails to activate, resulting in no switching action and unregulated output. For sub-2.7-V operation, consider TI's TPS61200 or similar ultra-low-VIN boost converters.
How does the shutdown pin (SHDN) interface with a 1.8-V GPIO?
The LM2731YMF/NOPB SHDN pin has a 0.5-V turn-off threshold and tolerates voltages up to VIN + 0.3 V. A 1.8-V GPIO can directly drive SHDN only if VIN ≥ 1.5 V; otherwise, a level-shifter or open-drain buffer is required. TI recommends tying SHDN to VIN if unused - no pull-up resistor needed - to avoid floating inputs that cause erratic enable/disable behavior.
What is the typical efficiency of the LM2731YMF/NOPB at 500 mA output current?
At 500 mA output (e.g., 5 V → 12 V boost), the LM2731YMF/NOPB achieves 86% typical efficiency with 5-V input, 10-µH inductor, and MBR0520 Schottky diode - as verified in Figure 17 of the SNVS217G datasheet. Efficiency drops to ~78% at full 1.8-A switch current due to increased conduction and switching losses, remaining within specification across −40°C to +125°C junction temperature.
LM2731YMF/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
LM2731YMF/NOPB FAQ
1.How can I place an order for LM2731YMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2731YMF/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 LM2731YMF/NOPB reliable?
The price and inventory of LM2731YMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2731YMF/NOPB is usually 5 days.
3.What payment methods are accepted for LM2731YMF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2731YMF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2731YMF/NOPB?
LM2731YMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2731YMF/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 LM2731YMF/NOPB?
For technical support, including LM2731YMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2731YMF/NOPB requirements.
6.How does Aetrix verify that LM2731YMF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2731YMF/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 LM2731YMF/NOPB meets industry standards.
7.What is the process for return or replacement of LM2731YMF/NOPB?
All LM2731YMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2731YMF/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 LM2731YMF/NOPB part is unused and in its original packaging.
Return procedure for LM2731YMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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