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Texas Instruments LM2735YMF/NOPB
- Part No.:
- LM2735YMF/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2735YMF/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
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Product details
Overview
LM2735YMF/NOPB from Texas Instruments is a 520-kHz, 2.1-A current-mode 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 and 170-mΩ NMOS switch. It delivers up to 90% efficiency in portable LCD backlighting and USB-powered devices.
For engineers reviewing the LM2735YMF/NOPB datasheet, LM2735YMF/NOPB pinout, LM2735YMF/NOPB application, or LM2735YMF/NOPB equivalent, key selection criteria include switching frequency (520 kHz), internal soft start (4 ms), ultra-low shutdown current (80 nA), current-mode control architecture, and SOT-23-5 thermal performance (RθJA = 164.2°C/W).
Technical Context
The LM2735YMF/NOPB implements fixed-frequency peak-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 variable-duty-cycle PWM, directly controlling the integrated 170-mΩ NMOS switch.
Operation requires only five external components: input/output capacitors, inductor, diode, and feedback resistor divider. The device integrates soft-start ramp (4 ms), pulse-by-pulse current limit (2.1 A min), thermal shutdown (160°C), and logic-high enable with 0.4 V low-threshold and 1.8 V high-threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz - enables use of small SMD inductors (e.g., 15 µH) and chip capacitors, minimizing PCB area |
| Max Switch Current | 2.1 A - supports ≥350 mA output at 12 V with margin for transient loads in portable applications |
| Feedback Voltage | 1.255 V ±2% - sets output voltage via resistor divider; ensures ≤±0.5% output error over temperature and line |
| Quiescent Current | 3.4 mA (active), 80 nA (shutdown) - extends battery life in always-on or duty-cycled portable systems |
| RDS(ON) | 170 mΩ (TJ = 25°C) - limits conduction loss to <120 mW at 1 A, critical for thermal management in SOT-23 |
| Enable Threshold | 1.8 V (high), 0.4 V (low) - compatible with 1.8-V/3.3-V logic; prevents false turn-on from noise or floating inputs |
| UVLO Threshold | 2.3 V (rising), 1.9 V (falling) - ensures clean startup and brownout recovery in Li-ion and USB 5-V supply rails |
Pinout & Package
SOT-23-5 package (1.60 mm × 2.90 mm), thermally enhanced with exposed pad not present; power dissipation limited to 400 mW in still air per JEDEC JESD51-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies internal bias and power stage; must be decoupled within 2 mm of pin with ≥22 µF X5R ceramic |
| SW | Switch node | Drives external inductor; swings from GND to VOUT + VF(diode); requires tight layout to minimize EMI and ringing |
| EN | Logic-enable input | Active-high shutdown control; must be pulled to GND or driven by 1.8-V/3.3-V GPIO; floating prohibited |
| FB | Feedback input | Connects to bottom resistor of voltage divider; high-impedance (0.1 µA bias) - place near AGND for noise immunity |
| GND | Signal ground | Reference for FB and EN; separate from PGND in layout; connects to bottom resistor node and PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft start | 4-ms output ramp - limits inrush current into output capacitor, preventing input rail sag and system reset |
| Current-mode control | No external compensation required - simplifies design for 3–24 V output range while maintaining stability across load steps |
| Ultra-low shutdown current | 80 nA - draws <1 µA total from input during shutdown, enabling multi-year battery life in IoT sensors |
| Integrated 170-mΩ NMOS | Eliminates external FET and driver - reduces BOM count and layout complexity vs discrete boost controllers |
| Two-frequency option | 520 kHz (Y version) - balances efficiency and size; avoids AM radio band interference unlike 1.6-MHz variant |
Applications
| Portable LCD Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving white LED strings (3–5 LEDs in series) from single-cell Li-ion (3.0–4.2 V) or USB 5-V input in smartphones and tablets. IC Role / Device Role / Timing Role: Boost regulator providing regulated 12–20 V output with current-mode loop ensuring fast response to brightness PWM dimming. Use Value: Delivers >85% efficiency at 350 mA output, enabling >5-hour display runtime on 1000-mAh battery with minimal thermal rise in SOT-23. | Use Scenario: Generating bias voltages (VDD, VSS) for OLED pixel drivers in wearables and smartwatches operating from coin-cell or micro-USB sources. IC Role / Device Role / Timing Role: SEPIC-configured regulator delivering stable 3.3 V or 5 V output despite input dropping below output during battery discharge. Use Value: Maintains regulation down to 2.7 V input while consuming only 3.4 mA quiescent current, extending usable battery capacity by 12% vs higher-IQ alternatives. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Powering image sensor bias, flash LED charging, and MCU peripherals from USB 2.0 (4.75–5.25 V) bus in portable accessories. IC Role / Device Role / Timing Role: Boost converter stepping USB voltage to 9 V or 12 V for analog front-end circuits and flash capacitors. Use Value: Achieves 90% peak efficiency at 200 mA load, reducing heat generation in sealed enclosures and meeting USB power budget constraints. | Use Scenario: Supplying programmable gain amplifier (PGA) rails and CCD/CMOS sensor bias in compact point-and-shoot cameras powered by AA alkaline cells (1.8–3.2 V). IC Role / Device Role / Timing Role: High-efficiency boost regulator delivering 3.3 V and 5 V outputs with soft-start to prevent sensor initialization faults during power-up. Use Value: Internal 4-ms soft start eliminates output overshoot, ensuring reliable sensor boot without firmware reinitialization or image corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2735XMF/NOPB | 1.6-MHz switching frequency, 190-mΩ RDS(ON) in WSON-6, higher quiescent current (7 mA active) | Better suited for space-constrained designs requiring smallest inductors; less efficient at light loads due to higher switching loss | Select when PCB area is primary constraint and input voltage remains ≥3.3 V; avoid for battery-life-critical applications |
| TPS61040DRVR | Fixed 500-kHz frequency, 2-A switch, 1.23-V feedback, no internal soft start, SOT-23-6 package | Lacks integrated soft start and thermal shutdown; requires external compensation for >15-V output | Choose for cost-sensitive, non-safety-critical applications where external soft-start circuitry is acceptable and thermal monitoring is handled system-level |
Compared with LM2735XMF/NOPB, the LM2735YMF/NOPB trades higher light-load efficiency and lower thermal stress for larger passive components; versus TPS61040DRVR, it provides greater system robustness via integrated soft start and thermal protection at modest BOM cost increase.
Availability
LM2735YMF/NOPB is available at Aetrix Electronics and suitable for portable LCD backlighting, USB-powered peripherals, and digital camera power supplies requiring stable component supply, long-term manufacturability, and TI's automotive-grade process consistency.
Supply support for LM2735YMF/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 markets.
The LM2735 product line delivers space-efficient, easy-to-use DC/DC regulators targeting portable electronics with stringent size, efficiency, and battery-life requirements - specifically optimized for boost and SEPIC topologies.
FAQ
What is the maximum output voltage supported by the LM2735YMF/NOPB?
The LM2735YMF/NOPB supports output voltages up to 24 V when configured in boost topology, as confirmed by TI's recommended operating conditions (VSW = 3 V to 24 V). This rating applies across the full –40°C to +125°C junction temperature range and is validated by internal switch voltage rating and thermal shutdown behavior. The LM2735YMF/NOPB achieves this using its 170-mΩ NMOS switch and current-mode control loop, which maintains regulation even under high step-up ratios.
Does the LM2735YMF/NOPB require external compensation components?
No, the LM2735YMF/NOPB does not require external compensation components. It features fully internal compensation optimized for current-mode control, enabling stable operation with only five external components: input capacitor, output capacitor, inductor, catch diode, and feedback resistor divider. TI's datasheet confirms this in Section 7.3.4 and Figure 15–16, where internal compensation is shown to provide adequate phase margin without added RC networks - a key differentiator from voltage-mode controllers like the TPS61040DRVR.
What is the purpose of the AGND pin on the LM2735YMF/NOPB, and how should it be connected?
The LM2735YMF/NOPB does not have an AGND pin in the SOT-23-5 package. Per TI's Pin Functions table, the SOT-23 variant uses a single GND pin (Pin 2) serving both signal and power ground functions. AGND appears only in WSON-6 and MSOP-PowerPAD packages as a dedicated analog ground. For LM2735YMF/NOPB, connect Pin 2 (GND) to the PCB ground plane with short traces, and route the bottom resistor of the feedback divider directly to this pin to minimize noise coupling into the 1.255-V reference path.
Can the LM2735YMF/NOPB be used in SEPIC topology, and what design considerations apply?
Yes, the LM2735YMF/NOPB supports SEPIC topology as explicitly stated in TI's Description and Applications sections. Key considerations include using a coupled inductor or two separate inductors with equal value, selecting a catch diode rated for ≥1.5× the maximum output voltage, and configuring the feedback network for the desired output polarity and regulation point. Unlike boost mode, SEPIC allows output voltage to be above or below input - critical for battery-powered systems where VIN may drop below VOUT during discharge. TI provides SEPIC reference schematics in Application Note SNVA529.
How does the soft-start function operate in the LM2735YMF/NOPB, and what is its duration?
The LM2735YMF/NOPB implements internal soft start by ramping the error amplifier's reference voltage from 0 V to its nominal 1.255 V over approximately 4 ms, as specified in Electrical Characteristics (SS = 4 ms). This linear ramp forces the output voltage to rise gradually, limiting inrush current into the output capacitor and preventing input rail collapse or system brownout. The soft-start timing is fixed and unadjustable - no external capacitor is needed, distinguishing it from controllers requiring external soft-start pins like the TPS61088.
LM2735YMF/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:
- 520kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2735YMF/NOPB FAQ
1.How can I place an order for LM2735YMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735YMF/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 LM2735YMF/NOPB reliable?
The price and inventory of LM2735YMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735YMF/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735YMF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735YMF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735YMF/NOPB?
LM2735YMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735YMF/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 LM2735YMF/NOPB?
For technical support, including LM2735YMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735YMF/NOPB requirements.
6.How does Aetrix verify that LM2735YMF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735YMF/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 LM2735YMF/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735YMF/NOPB?
All LM2735YMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735YMF/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 LM2735YMF/NOPB part is unused and in its original packaging.
Return procedure for LM2735YMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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