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Texas Instruments LM2735YQMFX/NOPB
- Part No.:
- LM2735YQMFX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2735YQMFX/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,292
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Product details
Overview
LM2735YQMFX/NOPB from Texas Instruments is a 520-kHz, 2.1-A low-side switch boost/SEPIC DC/DC regulator in SOT-23-5 package, supporting 2.7–5.5 V input and 3–24 V output with ±2% feedback voltage accuracy and 170-mΩ NMOS switch. It delivers up to 90% efficiency in portable LCD backlighting and USB-powered devices.
For engineers reviewing the LM2735YQMFX/NOPB datasheet, LM2735YQMFX/NOPB pinout, LM2735YQMFX/NOPB application, or LM2735YQMFX/NOPB equivalent, key selection criteria include switching frequency (520 kHz), peak switch current (2.1 A), ultra-low shutdown current (80 nA), internal soft start (4 ms), and feedback voltage tolerance (±2%).
Technical Context
The LM2735YQMFX/NOPB implements fixed-frequency current-mode control with internal compensation, enabling stable regulation across wide load and line variations without external loop components. Its 520-kHz oscillator sets timing for pulse-width modulation, while cycle-by-cycle current limiting protects the 170-mΩ NMOS switch during overloads.
Operation requires only five external components: input/output capacitors, inductor, diode, and feedback divider. The device enters shutdown at EN < 0.4 V, reducing quiescent current to 80 nA, and resumes regulation when EN exceeds 1.8 V - ideal for battery-critical portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz - enables use of compact 10–22 µH SMD inductors and chip capacitors, minimizing PCB footprint. |
| Peak Switch Current | 2.1 A - supports ≥350 mA output at 12 V in boost configuration with margin for transient loads. |
| Feedback Voltage | 1.255 V ±2% - sets output voltage via resistor divider; accuracy ensures stable regulation across –40°C to 125°C. |
| Shutdown Current | 80 nA - extends battery life in standby mode without requiring external disconnect circuitry. |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V), Li-polymer, and 3.3/5 V rail supplies. |
| Output Voltage Range | 3 V to 24 V - configurable for white LED strings (12–24 V), OLED bias (3–5 V), or USB OTG (5 V). |
| Switch RDS(on) | 170 mΩ - limits conduction loss at full load; contributes to ≥90% peak efficiency at 12 V output. |
Pinout & Package
SOT-23-5 package (1.60 mm × 2.90 mm) with exposed pad not connected internally; thermal performance relies on PCB copper area under pin 2 (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies power stage; must be decoupled with ≥22 µF X5R ceramic capacitor near pin. |
| SW | Switch node | Drives external inductor/diode; high dv/dt node requiring short trace routing and ground shielding. |
| EN | Enable control | Logic-high active; threshold 1.8 V min; floating or >VIN+0.3 V risks latch-up or damage. |
| FB | Feedback input | Connects to resistor divider midpoint; 0.1 µA bias current allows high-value resistors to minimize quiescent loss. |
| GND | Signal & power ground | Common reference for FB, EN, and SW return path; must tie to solid ground plane with multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft start | 4-ms output ramp prevents inrush current into large output capacitors, eliminating need for external soft-start circuitry. |
| Current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sense resistor. |
| Internal compensation | Eliminates external compensation network; simplifies design and reduces BOM count for space-constrained applications. |
| Ultra-low shutdown current | 80 nA draw preserves battery charge in always-on portable systems with intermittent operation. |
| Pulse-by-pulse current limit | Protects internal NMOS switch during overload or short-circuit events by disabling SW each cycle exceeding 2.1 A. |
Applications
| LCD Display Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving parallel white LED strings in handheld medical monitors and industrial HMIs powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Boost regulator generating 12–24 V from 3.3–4.2 V battery to maintain constant LED current via external current-sense resistor. Use Value: 520-kHz switching enables small 15 µH inductor and 10 µF output capacitor, fitting within 8 mm² board area. | Use Scenario: Providing regulated 3.3–5 V bias for OLED display modules in smart wearables with tight thermal constraints. IC Role / Device Role / Timing Role: SEPIC converter delivering stable output despite battery voltage sag below output level during discharge. Use Value: Internal soft start (4 ms) and ±2% VFB accuracy ensure flicker-free startup and consistent brightness across temperature. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Generating 5 V from USB 5 V input to power auxiliary sensors or audio codecs requiring clean, isolated supply. IC Role / Device Role / Timing Role: Boost regulator operating in 1:1 mode with minimal dropout, leveraging 170-mΩ RDS(on) for high efficiency at light loads. Use Value: 80 nA shutdown current meets USB suspend mode leakage requirements (<100 nA) without external switches. | Use Scenario: Supplying 12 V flash LED driver and 3.3 V image sensor core from dual-cell alkaline (2.4–3.2 V) or Li-ion (3.0–4.2 V) sources. IC Role / Device Role / Timing Role: High-current boost regulator delivering 350 mA at 12 V with thermal shutdown (160°C) preventing overheating during burst capture. Use Value: 2.1-A peak switch current supports 2× LED flash pulses without current foldback or output droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2735XMF/NOPB | 1.6-MHz switching frequency, same package and pinout; higher quiescent current (7 mA vs 3.4 mA) in active mode. | Better suited for ultra-compact designs needing smallest possible inductors (e.g., <4.7 µH); less optimal for noise-sensitive analog sections. | Select LM2735XMF/NOPB when board area is constrained and EMI filtering is feasible; otherwise LM2735YQMFX/NOPB offers better efficiency and lower noise. |
| TPS61040DRVR | Fixed 500-kHz frequency, 28-V max output, 0.5-A switch current, 5-pin SOT-23 package; no internal soft start or thermal shutdown. | Limited to lower-power applications (≤150 mA at 12 V); requires external soft-start capacitor and thermal monitoring. | Choose TPS61040DRVR only for cost-sensitive, low-current designs where internal protections are managed externally. |
Compared with LM2735XMF/NOPB, LM2735YQMFX/NOPB trades higher inductor size for improved efficiency and lower EMI; versus TPS61040DRVR, it provides integrated protection and tighter output regulation at higher current, justifying its use in mission-critical portable power rails.
Availability
LM2735YQMFX/NOPB is available at Aetrix Electronics and suitable for LCD backlighting, OLED bias, and USB-powered portable electronics requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for LM2735YQMFX/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 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 boost/SEPIC regulators targeting portable electronics with stringent size, efficiency, and battery-life requirements.
FAQ
What is the switching frequency of the LM2735YQMFX/NOPB?
The LM2735YQMFX/NOPB operates at a fixed 520-kHz switching frequency. This value is factory-set and cannot be adjusted externally. It enables use of small surface-mount inductors (e.g., 10–22 µH) and ceramic capacitors while maintaining high efficiency (up to 90%) and low output ripple. The 520-kHz frequency balances PCB area reduction against EMI filter complexity.
Does the LM2735YQMFX/NOPB require external compensation components?
No, the LM2735YQMFX/NOPB features fully internal compensation. Its current-mode control architecture and optimized error amplifier eliminate the need for external compensation networks such as RC or RCD snubbers. This reduces BOM count, saves PCB space, and accelerates design time - confirmed in TI's SNVS485I datasheet Section 7.3.4.
What is the maximum output current achievable with the LM2735YQMFX/NOPB?
The LM2735YQMFX/NOPB supports up to 2.1 A peak switch current, enabling ≥350 mA continuous output at 12 V in boost configuration (per typical application Figure 9). Actual deliverable current depends on input voltage, output voltage, ambient temperature, and PCB thermal design - e.g., 250 mA at 24 V with 3.3 V input and 2-layer board.
How does the enable pin (EN) function on the LM2735YQMFX/NOPB?
The EN pin on the LM2735YQMFX/NOPB is logic-high active: applying ≥1.8 V enables regulation, while ≤0.4 V forces shutdown with 80-nA quiescent current. The pin must never float or exceed VIN + 0.3 V to prevent damage. No pull-up is required if driven actively; TI recommends direct MCU GPIO connection with series resistor for ESD protection.
Can the LM2735YQMFX/NOPB be used in SEPIC topology?
Yes, the LM2735YQMFX/NOPB supports SEPIC configuration per its official description and application circuits in SNVS485I. In SEPIC mode, it regulates output voltage even when input drops below output (e.g., 2.7 V → 5 V), using two coupled inductors or a single coupled inductor with center tap. External component selection differs from boost mode but leverages identical IC functionality.
LM2735YQMFX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 520kHz
- 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
LM2735YQMFX/NOPB FAQ
1.How can I place an order for LM2735YQMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735YQMFX/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 LM2735YQMFX/NOPB reliable?
The price and inventory of LM2735YQMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735YQMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735YQMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735YQMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735YQMFX/NOPB?
LM2735YQMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735YQMFX/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 LM2735YQMFX/NOPB?
For technical support, including LM2735YQMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735YQMFX/NOPB requirements.
6.How does Aetrix verify that LM2735YQMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735YQMFX/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 LM2735YQMFX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735YQMFX/NOPB?
All LM2735YQMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735YQMFX/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 LM2735YQMFX/NOPB part is unused and in its original packaging.
Return procedure for LM2735YQMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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