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Texas Instruments LM2735XMF/NOPB
- Part No.:
- LM2735XMF/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2735XMF/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,648
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Product details
Overview
LM2735XMF/NOPB from Texas Instruments is a 1.6-MHz, 2.1-A low-side switch boost/SEPIC DC/DC regulator in SOT-23-5 package, supporting 2.7 V–5.5 V input and up to 24 V output, with ±2% feedback voltage accuracy, 170-mΩ NMOS switch, and 80 nA shutdown current. It enables compact LCD backlight and USB-powered device power supplies.
For engineers reviewing the LM2735XMF/NOPB datasheet, LM2735XMF/NOPB pinout, LM2735XMF/NOPB application, or LM2735XMF/NOPB equivalent, key selection criteria include switching frequency (1.6 MHz), peak switch current (2.1 A), feedback reference (1.255 V), thermal shutdown threshold (160°C), and SOT-23-5 package compatibility with space-constrained portable designs.
Technical Context
The LM2735XMF/NOPB implements constant-frequency peak current-mode control with internal compensation, enabling stable regulation without external loop components. Its 1.6-MHz oscillator allows use of sub-2-mm SMD inductors and chip capacitors while maintaining up to 90% efficiency at 350 mA output.
It integrates soft start (4 ms ramp), pulse-by-pulse current limiting (2.1 A min), undervoltage lockout (2.3 V rising), and thermal shutdown (160°C with 10°C hysteresis). The EN pin provides logic-high enable with 0.4 V shutdown threshold and <100 nA bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - enables use of ≤2.2-µH inductors and reduces solution footprint by >40% vs 520-kHz variants |
| Peak Switch Current | 2.1 A - supports ≥350 mA output at 12 V with margin for transient loads and startup inrush |
| Feedback Voltage | 1.255 V ±2% - sets output via resistor divider; enables precise 3–24 V programming with <±50 mV error |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-ion, 3.3 V rails, and USB 5 V sources |
| Shutdown Quiescent Current | 80 nA - extends battery life in always-on portable systems with periodic wake-up cycles |
| Internal NMOS RDS(on) | 170 mΩ - limits conduction loss to <120 mW at 1 A, improving thermal performance in SOT-23 |
| Thermal Shutdown | 160°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design |
Pinout & Package
SOT-23-5 package (1.60 mm × 2.90 mm) with exposed pad not connected internally; requires solder mask defined pad for thermal relief only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies internal regulator and power stage; must be decoupled within 3 mm of pin with ≥10 µF ceramic capacitor |
| SW | Switch node | Connects to inductor and catch diode anode; high dv/dt node requiring tight layout and minimal trace length |
| EN | Enable control | Logic-high active; 0.4 V threshold ensures reliable disable with microcontroller GPIO; must not exceed VIN + 0.3 V |
| FB | Feedback input | High-impedance (0.1 µA bias) node sensing resistor divider; place bottom resistor adjacent to AGND for noise immunity |
| GND | Signal ground | Reference for FB and EN; separate from PGND in layout; connect to system ground plane with multiple vias |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft start | 4-ms output ramp prevents inrush current into large output capacitors and avoids input rail sag |
| Current-mode control | Enables fast transient response (<10 µs recovery) and inherent cycle-by-cycle overcurrent protection |
| Internal compensation | Eliminates need for external compensation network-reduces BOM count and layout sensitivity |
| Ultra-low shutdown current | 80 nA enables multi-year battery operation in IoT sensors and remote controls during sleep mode |
| Two fixed frequencies | 1.6-MHz option (LM2735X) targets ultra-compact designs; 520-kHz (LM2735Y) favors higher efficiency at medium loads |
Applications
| LCD Display Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving white LED strings in handheld medical monitors and industrial HMIs with 3.3 V or single-cell Li-ion input. IC Role / Device Role / Timing Role: Boost converter generating 12–24 V from 3.3 V/5 V to bias LED cathodes with constant-current sink control. Use Value: 1.6-MHz operation allows 1.5-µH inductor and 10-µF output cap, reducing total solution area to <25 mm². | Use Scenario: Providing regulated 15 V bias for OLED display driver ICs in smart wearables with strict size constraints. IC Role / Device Role / Timing Role: SEPIC topology delivering non-inverting 15 V output from variable 3.0–4.2 V battery input, avoiding polarity inversion issues. Use Value: Internal 170-mΩ switch and 2.1-A current limit support 200 mA load with >85% efficiency across full battery range. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Powering FPGA I/O banks or RF front-end modules from standard USB 5 V ports in portable test equipment. IC Role / Device Role / Timing Role: Boost regulator stepping 5 V USB input to 8–12 V for analog signal chains or sensor bias rails. Use Value: 80 nA shutdown current meets USB suspend mode leakage requirements (<500 nA) without external switches. | Use Scenario: Generating 12 V flash LED driver supply and 3.3 V image sensor core rail from dual-cell alkaline batteries (2.4–3.2 V). IC Role / Device Role / Timing Role: High-efficiency boost converter operating down to 2.7 V input, supporting burst-mode flash illumination. Use Value: 2.1-A switch current handles 1-A flash pulses with <100 µs turn-on delay, synchronized to camera shutter timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2735YMF/NOPB | 520-kHz switching frequency, same pinout and features; lower quiescent current (3.4 mA vs 7 mA) in active mode | Better efficiency at medium loads (>100 mA); larger inductor required (≥4.7 µH) increases solution size | Select when board space is less critical than peak efficiency or EMI sensitivity is high |
| TPS61040DRVR | 1-MHz fixed frequency, 0.5-A switch current, 20-V max output, different pinout (6-pin WSON) | Limited to ≤150 mA output at 12 V; lacks thermal shutdown and internal soft start | Choose only for low-power, cost-sensitive applications where 2.1-A capability is unnecessary |
Compared with LM2735YMF/NOPB, the LM2735XMF/NOPB trades ~3% efficiency at 200 mA for 60% smaller magnetics and lower EMI filter complexity; versus TPS61040DRVR, it delivers >2× output current, integrated thermal protection, and proven reliability in production portable designs.
Availability
LM2735XMF/NOPB is available at Aetrix Electronics and suitable for LCD backlighting, USB-powered peripherals, and digital camera power management requiring stable component supply and long-term manufacturability.
Supply support for LM2735XMF/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, high-efficiency DC/DC conversion solutions.
The LM2735 product line delivers space-efficient boost and SEPIC regulators for portable electronics, emphasizing ease-of-use, minimal external components, and robust thermal performance in tiny packages.
FAQ
What is the maximum output voltage supported by the LM2735XMF/NOPB?
The LM2735XMF/NOPB supports output voltages from 3 V to 24 V, set externally via a resistor divider on the FB pin. The 24 V upper limit is constrained by the absolute maximum SW pin voltage rating of 26.5 V and internal NMOS breakdown characteristics. Operation above 20 V requires careful attention to PCB creepage and diode reverse voltage ratings.
Does the LM2735XMF/NOPB require external compensation components?
No, the LM2735XMF/NOPB features fully internal compensation optimized for stability across its operating range. Unlike many current-mode controllers, it does not require external RC networks on the COMP or FB pins. This eliminates tuning effort and reduces bill-of-materials count while maintaining >45° phase margin in typical boost configurations.
Can the LM2735XMF/NOPB operate in SEPIC topology, and what modifications are needed?
Yes, the LM2735XMF/NOPB supports SEPIC operation using the same SOT-23-5 pinout. Required changes include adding a coupling capacitor between VIN and SW, splitting the inductor into two equal windings, and grounding the center tap. The feedback network remains identical, and no internal configuration is needed-the controller's current-mode architecture inherently supports both topologies.
What is the thermal performance of the LM2735XMF/NOPB in SOT-23-5 package at full load?
In a standard 2-layer PCB with 1-in² 2-oz copper pour under the SOT-23-5 exposed pad, the LM2735XMF/NOPB achieves θJA = 164.2°C/W. At 350 mA output (12 V), dissipation is ~450 mW, resulting in ~74°C junction rise above ambient-well below the 160°C thermal shutdown threshold. Adding thermal vias improves this by 20–30°C.
How does the enable pin (EN) of the LM2735XMF/NOPB behave during power-up?
The EN pin of the LM2735XMF/NOPB has a 0.4 V threshold and hysteresis to prevent chatter near the trip point. When VIN rises above UVLO (2.3 V), the device remains disabled until EN exceeds 0.4 V. Once enabled, it initiates 4-ms soft start. If EN drops below 0.4 V during operation, the device shuts down within one switching cycle, sinking <100 nA.
LM2735XMF/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, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 2.1A (Switch)
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2735XMF/NOPB FAQ
1.How can I place an order for LM2735XMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735XMF/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 LM2735XMF/NOPB reliable?
The price and inventory of LM2735XMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735XMF/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735XMF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735XMF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735XMF/NOPB?
LM2735XMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735XMF/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 LM2735XMF/NOPB?
For technical support, including LM2735XMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735XMF/NOPB requirements.
6.How does Aetrix verify that LM2735XMF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735XMF/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 LM2735XMF/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735XMF/NOPB?
All LM2735XMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735XMF/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 LM2735XMF/NOPB part is unused and in its original packaging.
Return procedure for LM2735XMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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