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Texas Instruments LM2735XMFX/NOPB
- Part No.:
- LM2735XMFX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2735XMFX/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,711
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Product details
Overview
LM2735XMFX/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 2.7–5.5 V input and up to 24 V output with ±2% feedback voltage accuracy, 170-mΩ NMOS switch, and 80 nA shutdown current. It delivers high-efficiency power conversion for space-constrained portable backlight and LED driver applications.
For engineers reviewing the LM2735XMFX/NOPB datasheet, LM2735XMFX/NOPB pinout, LM2735XMFX/NOPB application, or LM2735XMFX/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The LM2735XMFX/NOPB implements fixed-frequency (1.6 MHz), current-mode PWM control with internal compensation and soft-start, enabling stable regulation without external loop components. Its architecture integrates a 170-mΩ NMOS switch, precision 1.255-V reference, and cycle-by-cycle current limiting to support fast transient response in boost and SEPIC topologies.
It operates across –40°C to +125°C junction temperature, features logic-high enable with 0.4–1.8 V threshold, and includes thermal shutdown at 160°C with 10°C hysteresis. The device uses internal ramp compensation and delivers up to 90% efficiency at 12 V output with 350 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - enables use of ≤15 µH SMD inductors and chip capacitors, minimizing PCB footprint by >40% vs 520-kHz variants. |
| Max Switch Current | 2.1 A - supports ≥350 mA output at 12 V in boost configuration with margin for start-up transients and temperature drift. |
| Feedback Voltage | 1.255 V ±2% - sets output voltage via resistor divider; accuracy ensures <±3% output error over full temp range and line/load conditions. |
| Shutdown Current | 80 nA - extends battery life in always-on portable systems; adds negligible drain during extended sleep modes. |
| RDS(ON) | 170 mΩ - limits conduction loss to <120 mW at 1 A switch current, preserving >85% efficiency at light loads. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V), USB 5 V, and 3.3 V rail inputs without pre-regulation. |
| Output Voltage Range | 3 V to 24 V - configurable for white LED strings (12–24 V), OLED bias (5–15 V), or auxiliary rails in compact devices. |
Pinout & Package
SOT-23-5 package (1.60 mm × 2.90 mm) with exposed pad not connected; thermally optimized for low-RθJA (164.2°C/W) on standard 2-layer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies internal regulator and NMOS switch; must be decoupled within 3 mm of pin with ≥22 µF X5R ceramic capacitor. |
| SW | Switch node | Drives external inductor and catch diode; requires tight layout to minimize EMI and switching losses. |
| EN | Enable control | Logic-high active; 0.4–1.8 V threshold allows direct MCU GPIO drive; floating or >VIN+0.3 V damages IC. |
| FB | Feedback input | Connects to resistor divider midpoint; 0.1 µA bias current enables high-value dividers (e.g., 10.2 kΩ/86.6 kΩ for 12 V). |
| GND | Signal ground | Reference for FB and EN; must tie directly to PGND plane under IC with minimal trace length to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft start | 4-ms output ramp prevents inrush current into large output caps; eliminates need for external timing components. |
| Current-mode control | Enables inherent stability with single-pole compensation; supports wide input/output ratios without external loop tuning. |
| Ultra-low shutdown current | 80 nA draw allows multi-year battery operation in IoT sensors and wearables with periodic wake-up cycles. |
| Thermal shutdown | 160°C trip with 10°C hysteresis protects against sustained overload or poor heatsinking; auto-recovery avoids latch-up failures. |
| Fixed 1.6-MHz frequency | Shifts switching noise above AM radio band (1.6 MHz > 1.2 MHz), simplifying EMI filtering in consumer audio/video products. |
Applications
| LCD Display Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving 4–6 white LEDs in series from a 3.7-V Li-ion cell in smartphones or portable medical displays. IC Role / Device Role / Timing Role: Boost converter providing regulated 12–18 V output with constant-current LED driver interface. Use Value: 1.6-MHz operation allows 10–15 µH inductors and eliminates audible coil whine, critical for quiet clinical environments. | Use Scenario: Generating 5–15 V bias rails for OLED pixel drivers and gate-line shift registers in foldable tablets. IC Role / Device Role / Timing Role: SEPIC-configured regulator delivering stable output despite wide input variation during battery discharge. Use Value: ±2% VFB accuracy maintains display uniformity across temperature; 2.1-A switch handles peak panel refresh currents. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Powering 5-V logic and 12-V flash circuits from USB 2.0 (5 V ±5%) host ports in portable test equipment. IC Role / Device Role / Timing Role: Boost regulator stepping USB 5 V to 12 V for analog front-end amplifiers and sensor biasing. Use Value: 80-nA shutdown current preserves USB suspend mode compliance; SOT-23-5 fits dense USB-C dongle PCBs. | Use Scenario: Supplying 3.3 V and 5 V rails for CMOS image sensor, ISP, and SD card interface in compact action cameras. IC Role / Device Role / Timing Role: Dual-output boost/SEPIC stage feeding LDOs; supports burst-mode capture with fast load transient recovery. Use Value: Current-mode control achieves <50-µs output recovery from 100-mA step load, preventing image corruption during rapid shooting. |
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; higher max duty cycle (99% vs 96%); lower quiescent current (3.4 mA vs 7 mA in operation). | Better suited for ultra-low-noise audio applications where 1.6-MHz switching could interfere with sensitive analog stages. | Select LM2735YMF/NOPB when board area is less constrained and EMI filtering cost must be minimized. |
| TPS61040DRVR | Higher 28-V output capability; 500-kHz frequency; integrated Schottky diode; no SEPIC support; 1.2-A switch current. | Limited to boost-only topologies; insufficient for 24-V outputs or SEPIC-based battery-input isolation required in automotive diagnostics tools. | Choose TPS61040DRVR only for simple 3–5 V input to ≤15 V boost with minimal BOM count and no thermal stress concerns. |
Compared with LM2735XMFX/NOPB, the LM2735YMF/NOPB trades higher efficiency at light loads for larger magnetics and lower EMI, while the TPS61040DRVR sacrifices topology flexibility and output voltage headroom for integration and ease of layout-making LM2735XMFX/NOPB optimal for space-critical, multi-topology, high-output-voltage designs.
Availability
LM2735XMFX/NOPB is available at Aetrix Electronics and suitable for LCD backlighting, OLED bias supplies, and USB-powered instrumentation requiring stable component supply, long-term lifecycle assurance, and TI-qualified production lots.
Supply support for LM2735XMFX/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 ICs, with decades of expertise in high-efficiency DC/DC conversion.
The LM2735 product line delivers space-efficient, easy-to-use boost and SEPIC regulators targeting portable, battery-powered, and space-constrained applications where small solution size and low standby power are critical.
FAQ
What is the maximum output voltage achievable with LM2735XMFX/NOPB?
The LM2735XMFX/NOPB supports an output voltage range of 3 V to 24 V, set externally via the FB resistor divider. At VIN = 5 V and 1.6-MHz operation, it reliably delivers 24 V at up to 200 mA with >82% efficiency, limited primarily by switch current rating and thermal dissipation in the SOT-23-5 package.
Does LM2735XMFX/NOPB support SEPIC topology, and what external components are required?
Yes, LM2735XMFX/NOPB supports SEPIC topology per TI's official application notes. Required components include two coupled inductors (or two discrete inductors with mutual coupling), one catch diode, two input/output capacitors, and the FB resistor divider. No additional compensation or control ICs are needed due to internal current-mode architecture and compensation.
What is the purpose of the AGND pin, and is it present on LM2735XMFX/NOPB?
The AGND pin is not present on LM2735XMFX/NOPB. This variant uses the SOT-23-5 package, which has only five pins: VIN, SW, EN, FB, and GND. AGND appears only on the 6-pin WSON and 8-pin MSOP-PowerPAD packages for improved noise separation between analog and power grounds.
Can LM2735XMFX/NOPB operate with a 2.5-V input supply?
No. LM2735XMFX/NOPB has a minimum recommended input voltage of 2.7 V and an undervoltage lockout (UVLO) turn-on threshold of 2.3 V (typical). Operation below 2.7 V violates recommended conditions and may cause unstable regulation, reduced efficiency, or premature shutdown during battery discharge.
How does the 1.6-MHz switching frequency of LM2735XMFX/NOPB impact thermal performance compared to 520-kHz variants?
At 1.6 MHz, LM2735XMFX/NOPB exhibits higher switching losses but lower conduction losses due to reduced inductor DCR requirements. In practice, its thermal performance is dominated by package limitations: the SOT-23-5 version has RθJA = 164.2°C/W, making thermal derating essential above 350 mA output current-unlike the 520-kHz LM2735YMF/NOPB, which sustains higher loads before thermal limiting.
LM2735XMFX/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
LM2735XMFX/NOPB FAQ
1.How can I place an order for LM2735XMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735XMFX/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 LM2735XMFX/NOPB reliable?
The price and inventory of LM2735XMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735XMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735XMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735XMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735XMFX/NOPB?
LM2735XMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735XMFX/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 LM2735XMFX/NOPB?
For technical support, including LM2735XMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735XMFX/NOPB requirements.
6.How does Aetrix verify that LM2735XMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735XMFX/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 LM2735XMFX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735XMFX/NOPB?
All LM2735XMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735XMFX/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 LM2735XMFX/NOPB part is unused and in its original packaging.
Return procedure for LM2735XMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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