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Texas Instruments LM2735XQMF/NOPB
- Part No.:
- LM2735XQMF/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2735XQMF/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,005
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Product details
Overview
LM2735XQMF/NOPB from Texas Instruments is a 1.6-MHz, 2.1-A current-mode boost/SEPIC DC/DC regulator in a 5-pin SOT-23 package, supporting 2.7–5.5 V input and up to 24 V output. It integrates a 170-mΩ NMOS switch, ±2% feedback voltage accuracy, internal soft start, and ultra-low 80 nA shutdown current-designed for space-constrained portable backlighting and USB-powered systems.
For engineers reviewing the LM2735XQMF/NOPB datasheet, LM2735XQMF/NOPB pinout, LM2735XQMF/NOPB application, or LM2735XQMF/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 package compatibility with high-density PCB layouts.
Technical Context
The LM2735XQMF/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 surface-mount inductors and chip capacitors while maintaining up to 90% efficiency at 350 mA output.
Operation relies on pulse-by-pulse current limiting (2.1 A min), logic-high enable control, and a dedicated power ground (PGND) separate from analog ground (AGND) to minimize noise coupling. Thermal shutdown activates at 160°C with 10°C hysteresis, and undervoltage lockout engages below 2.3 V (rising) to prevent erratic startup.
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 in portable displays |
| Feedback Voltage | 1.255 V ±2% - sets output via resistor divider; accuracy ensures <±3% output error across temperature |
| 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 |
| Shutdown Current | 80 nA - extends battery life in always-on standby modes for handheld devices |
| RDS(ON) | 170 mΩ - limits conduction loss to <120 mW at 1 A, improving thermal performance in SOT-23 |
| Soft Start Time | 4 ms - controls output ramp rate to limit inrush current into large display capacitors |
Pinout & Package
LM2735XQMF/NOPB uses the DBV (SOT-23-5) package: 1.60 mm × 2.90 mm, 1.1-mm height, thermally enhanced with exposed pad connected to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies power stage; must be decoupled with ≥10 µF ceramic capacitor near pin |
| SW | Switch node | Connects to inductor and catch diode anode; high dv/dt node requiring tight layout and ground guard ring |
| EN | Enable control | Logic-high active; float or >VIN+0.3 V risks latch-up; pull-down resistor required for default-off operation |
| FB | Feedback input | Senses output via resistor divider; trace must be short and routed away from SW and PGND to avoid noise coupling |
| GND | Signal ground | Reference for FB and EN; connect directly to PGND plane under IC via multiple vias for low-impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation network-reduces BOM count and design iteration time |
| Current-mode control | Provides inherent cycle-by-cycle overcurrent protection and fast transient response (<10 µs to 100 mA step) |
| Thermal shutdown | 160°C activation with 10°C hysteresis prevents permanent damage during sustained overload or poor heatsinking |
| Ultra-low shutdown current | 80 nA enables multi-year battery life in IoT sensors and remote controls powered by coin cells |
| Two-frequency option | 1.6-MHz variant (LM2735X) prioritizes size reduction; 520-kHz (LM2735Y) favors efficiency at medium loads |
Applications
| LCD Display Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving white LED strings in smartphones and tablets with 3.7-V Li-ion battery input. IC Role / Device Role / Timing Role: Boost converter generating 12–24 V from 2.7–4.2 V battery to bias LED cathodes. Use Value: 1.6-MHz operation enables <2.2-µH inductors and 10-µF output caps-reducing total solution area to <12 mm². | Use Scenario: Providing regulated 15–20 V bias for OLED pixel drivers in wearables and smartwatches. IC Role / Device Role / Timing Role: SEPIC topology delivering stable output despite wide battery voltage swing (3.0–4.2 V). Use Value: Internal soft start (4 ms) prevents display flash during power-on; ±2% VFB ensures consistent brightness across temperature. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Powering 5-V peripherals (e.g., USB-C PD accessories) from 5-V USB host port. IC Role / Device Role / Timing Role: Boost regulator stepping 5 V up to 9–12 V for auxiliary rails or motor drivers. Use Value: 80 nA shutdown current meets USB suspend mode leakage requirements (<500 nA); logic-high EN simplifies MCU control. | Use Scenario: Generating 12 V for CCD/CMOS sensor bias and flash LED drivers in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: High-efficiency boost converter operating from dual AA/AAA alkaline cells (1.8–3.2 V). Use Value: 2.1-A switch current supports 500-ms flash bursts; 170-mΩ RDS(ON) minimizes thermal rise in sealed plastic housing. |
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 but lower frequency enables higher efficiency at >200 mA loads | Better suited for medium-power applications where board space is less constrained than efficiency | Select when optimizing for peak efficiency >88% at 300–500 mA rather than minimal footprint |
| TPS61040DRVR | Fixed 500-kHz frequency; 28-V max output; 1.1-A switch current; requires external compensation | Limited to lower output current; lacks integrated soft start and thermal shutdown hysteresis | Choose only if cost sensitivity outweighs need for robust protection and ease-of-use |
Compared with LM2735YMF/NOPB, the LM2735XQMF/NOPB trades ~3% peak efficiency for >2× smaller magnetics and 40% smaller PCB area; versus TPS61040DRVR, it delivers higher current capability, built-in protections, and simpler layout-making it superior for production-critical portable designs.
Availability
LM2735XQMF/NOPB is available at Aetrix Electronics and suitable for LCD backlighting, OLED bias supplies, and USB-powered peripherals requiring stable component supply, long-term manufacturability, and automotive-grade reliability validation.
Supply support for LM2735XQMF/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-reliability DC/DC conversion.
The LM2735 product line delivers space-efficient, easy-to-design boost/SEPIC regulators targeting portable electronics where small size, low quiescent current, and robust protection are mandatory.
FAQ
What is the maximum output voltage supported by the LM2735XQMF/NOPB?
The LM2735XQMF/NOPB supports output voltages up to 24 V, set externally via the feedback resistor divider connected to the FB pin. This range accommodates common display backlight (12–24 V) and OLED panel bias (15–20 V) requirements. The internal 170-mΩ NMOS switch and thermal shutdown (160°C) ensure safe operation at these voltages when properly heatsunk.
Does the LM2735XQMF/NOPB require external compensation components?
No, the LM2735XQMF/NOPB features fully internal compensation optimized for stability across its operating range. Unlike many boost controllers, it eliminates the need for external RC networks or type-II/type-III compensators-reducing bill-of-materials count and layout complexity while maintaining >45° phase margin in typical applications.
What is the purpose of the separate AGND and PGND pins on the LM2735XQMF/NOPB?
The LM2735XQMF/NOPB separates analog ground (AGND) and power ground (PGND) to isolate noise-sensitive feedback circuitry from high-current switching paths. AGND serves as the reference for the FB and EN pins, while PGND carries pulsed inductor return current. Proper PCB layout-connecting both to a common ground plane under the IC via multiple vias-minimizes ground bounce and improves regulation accuracy.
Can the LM2735XQMF/NOPB operate from a single 3.7-V Li-ion battery?
Yes, the LM2735XQMF/NOPB operates across 2.7–5.5 V input, fully covering the discharge curve of a single-cell Li-ion battery (3.0–4.2 V nominal). Its 2.1-A switch current and 1.6-MHz frequency enable efficient 12-V output at 350 mA even at 3.0 V input-critical for maintaining display brightness throughout battery life.
How does the soft-start function of the LM2735XQMF/NOPB improve system reliability?
The LM2735XQMF/NOPB incorporates a 4-ms internal soft-start that ramps the error amplifier reference from 0 V to 1.255 V, controlling output voltage slew rate. This prevents inrush current into large output capacitors-reducing stress on input sources, catch diodes, and PCB traces-and eliminates display flash or microcontroller brownout during power-up in portable systems.
LM2735XQMF/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2735XQMF/NOPB FAQ
1.How can I place an order for LM2735XQMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735XQMF/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 LM2735XQMF/NOPB reliable?
The price and inventory of LM2735XQMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735XQMF/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735XQMF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735XQMF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735XQMF/NOPB?
LM2735XQMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735XQMF/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 LM2735XQMF/NOPB?
For technical support, including LM2735XQMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735XQMF/NOPB requirements.
6.How does Aetrix verify that LM2735XQMF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735XQMF/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 LM2735XQMF/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735XQMF/NOPB?
All LM2735XQMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735XQMF/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 LM2735XQMF/NOPB part is unused and in its original packaging.
Return procedure for LM2735XQMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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