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Texas Instruments LM2735XQMFX/NOPB
- Part No.:
- LM2735XQMFX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2735XQMFX/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,956
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Product details
Overview
LM2735XQMFX/NOPB from Texas Instruments is a 1.6-MHz, 2.1-A low-side NMOS boost/SEPIC DC/DC regulator in a 5-pin SOT-23 package, operating from 2.7 V to 5.5 V input and delivering up to 24 V output with ±2% feedback voltage accuracy (1.255 V nominal), 170-mΩ internal switch RDS(ON), and 80 nA shutdown current - used in portable LCD backlighting and USB-powered white LED drivers.
For engineers reviewing the LM2735XQMFX/NOPB datasheet, LM2735XQMFX/NOPB pinout, LM2735XQMFX/NOPB application, or LM2735XQMFX/NOPB equivalent, key selection criteria include switching frequency (1.6 MHz), peak switch current rating (2.1 A), feedback reference tolerance (±2%), thermal shutdown threshold (160°C), and SOT-23 package compatibility with space-constrained portable power designs.
Technical Context
The LM2735XQMFX/NOPB implements constant-frequency peak current-mode control with internal compensation, enabling stable regulation using only five external components. Its 1.6-MHz oscillator allows use of sub-2-mm SMD inductors and chip capacitors while maintaining up to 90% efficiency at 12-V output.
It integrates soft-start (4-ms ramp), cycle-by-cycle current limiting (2.1-A min over temperature), undervoltage lockout (2.3 V rising), and thermal shutdown (160°C with 10°C hysteresis). The EN pin enables logic-high activation with 100-nA bias current and 0.4-V shutdown threshold.
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 programmability with <±50 mV error. |
| RDS(ON) | 170 mΩ - limits conduction loss to <120 mW at 1-A load, improving thermal performance in SOT-23. |
| Shutdown Current | 80 nA - extends battery life in always-on portable systems; adds <1 µA total system leakage with SW leakage. |
| Input Voltage Range | 2.7 V to 5.5 V - matches single-cell Li-ion (3.0–4.2 V), USB 5 V, and 3.3-V rail inputs without pre-regulation. |
| Thermal Shutdown | 160°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
LM2735XQMFX/NOPB uses the DBV (SOT-23-5) package: 1.60 mm × 2.90 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant, lead-free (NOPB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies internal regulator and power stage; must be decoupled within 3 mm of pin with ≥22 µF X5R ceramic. |
| SW | Switch node | Connects to inductor and catch diode anode; high dv/dt node requiring tight layout and minimal trace area. |
| EN | Enable control | Logic-high active; 0.4-V threshold ensures reliable disable under brownout; must not exceed VIN + 0.3 V. |
| FB | Feedback input | Senses output via resistor divider; 0.1-µA bias current requires bottom resistor ≤100 kΩ for noise immunity. |
| GND | Signal/power ground | Single-point connection for FB divider and input/output caps; ties AGND and PGND internally in SOT-23. |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft start | 4-ms output ramp prevents inrush current into large output capacitors and avoids input rail droop. |
| Current-mode control | Enables fast transient response (<10 µs recovery) and inherent cycle-by-cycle overcurrent protection. |
| Ultra-low shutdown current | 80 nA enables multi-year battery operation in IoT sensors and always-on wake-up circuits. |
| Fixed 1.6-MHz frequency | Eliminates external frequency-setting components and simplifies EMI filtering with predictable harmonics. |
| Integrated 170-mΩ NMOS | Reduces BOM count by removing external switch and lowers thermal resistance vs. discrete solutions. |
Applications
| Portable LCD Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving 4–6 white LEDs in series from a single Li-ion cell in handheld medical displays. IC Role / Device Role / Timing Role: Boost regulator generating 12–18 V at 20–35 mA per string with analog/PWM dimming interface. Use Value: 1.6-MHz operation minimizes inductor size to 2.2 µH/2.5 mm × 2.0 mm, enabling <80-mm² total solution area. |
Use Scenario: Providing regulated 15-V bias for OLED pixel driver ICs in foldable smartphone panels. IC Role / Device Role / Timing Role: SEPIC converter sustaining output during Li-ion discharge from 4.2 V to 3.0 V without polarity reversal. Use Value: 2.1-A switch current supports 150-mA output with >85% efficiency across full input range and temperature. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Generating 5-V auxiliary rail from USB 5-V input for image sensor bias and flash charging in portable scanners. IC Role / Device Role / Timing Role: Boost regulator with enable pin synchronized to host USB enumeration for zero-quiescent standby. Use Value: 80-nA shutdown current meets USB Battery Charging v1.2 "suspend" requirements for <100-µA system leakage. |
Use Scenario: Powering CCD/CMOS sensor bias rails (12 V, 15 V) and flash capacitor charging (300 V) in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Primary boost stage feeding charge pump or flyback controller; operates only during capture sequence. Use Value: Internal soft start prevents 5-V USB port reset during flash capacitor pre-charge; thermal shutdown prevents lens motor interference. |
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 peak current (2.1 A same), but larger inductor required (≥10 µH). | Better light-load efficiency in battery-backed RTCs; unsuitable for ultra-compact layouts needing <3-mm² area. | Select when EMI sensitivity favors lower fundamental frequency and board space permits larger magnetics. |
| TPS61040DRVR | Higher 28-V output capability; 2.5-A switch; 1.2-MHz fixed frequency; no internal compensation. | Supports wider output range (2.5–28 V); requires external compensation network for stability tuning. | Choose when >24-V output or >2.1-A peak current is needed, accepting added design complexity for flexibility. |
Compared with LM2735YMF/NOPB, the LM2735XQMFX/NOPB trades light-load efficiency for 3× smaller passive components and tighter EMI control; versus TPS61040DRVR, it offers plug-and-play stability at the cost of output voltage ceiling and current headroom.
Availability
LM2735XQMFX/NOPB is available at Aetrix Electronics and suitable for portable display backlighting, USB-powered instrumentation, and digital camera power management requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade alternatives (LM2735-Q1).
Supply support for LM2735XQMFX/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 designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer applications.
The LM2735 product line delivers space-efficient, easy-to-use DC/DC boost and SEPIC regulators targeting portable electronics where small size, low quiescent current, and rapid time-to-market are critical.
FAQ
What is the maximum output voltage achievable with LM2735XQMFX/NOPB?
The LM2735XQMFX/NOPB supports output voltages from 3 V to 24 V, set by the external resistor divider on the FB pin. At 24 V, the device maintains regulation with ≥2.1-A peak switch current and 1.6-MHz operation, provided input voltage remains ≥2.7 V and thermal limits are observed. Output beyond 24 V risks exceeding absolute maximum SW voltage (26.5 V) and is not supported.
Does LM2735XQMFX/NOPB require external compensation components?
No, LM2735XQMFX/NOPB features fully internal compensation optimized for standard boost configurations. Unlike many boost controllers, it needs no external RC network for stability - only the FB divider, input/output capacitors, inductor, and catch diode are required. This reduces BOM count and design iteration time.
Can LM2735XQMFX/NOPB operate in SEPIC topology?
Yes, LM2735XQMFX/NOPB is explicitly qualified for SEPIC operation per TI's datasheet and application notes. Its low-side NMOS switch and current-mode architecture support both boost and SEPIC configurations. Required changes include adding a coupling capacitor between VIN and SW and adjusting the feedback divider for desired output.
What is the thermal performance of LM2735XQMFX/NOPB in SOT-23 package?
In the DBV (SOT-23-5) package, LM2735XQMFX/NOPB has a junction-to-ambient thermal resistance (RθJA) of 164.2°C/W on a standard 2-layer board. With proper copper pour and thermal vias, it sustains 1.2-A continuous output at 12 V without exceeding 125°C junction temperature. Thermal shutdown activates at 160°C with 10°C hysteresis.
Is LM2735XQMFX/NOPB pin-compatible with other LM2735 variants?
Yes, all LM2735 variants (X, Y, Q1) in the SOT-23-5 (DBV) package share identical pinout, footprint, and electrical interface. The LM2735XQMFX/NOPB can replace LM2735YMF/NOPB on the same PCB, though frequency-dependent layout optimizations (e.g., smaller inductor) may improve performance.
LM2735XQMFX/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
LM2735XQMFX/NOPB FAQ
1.How can I place an order for LM2735XQMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735XQMFX/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 LM2735XQMFX/NOPB reliable?
The price and inventory of LM2735XQMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735XQMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735XQMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735XQMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735XQMFX/NOPB?
LM2735XQMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735XQMFX/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 LM2735XQMFX/NOPB?
For technical support, including LM2735XQMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735XQMFX/NOPB requirements.
6.How does Aetrix verify that LM2735XQMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735XQMFX/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 LM2735XQMFX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735XQMFX/NOPB?
All LM2735XQMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735XQMFX/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 LM2735XQMFX/NOPB part is unused and in its original packaging.
Return procedure for LM2735XQMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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