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Texas Instruments LM2735YMFX/NOPB
- Part No.:
- LM2735YMFX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2735YMFX/NOPB.pdf
- Description:
- IC REG BOOST FLYBACK ADJ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,772
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Product details
Overview
LM2735YMFX/NOPB from Texas Instruments is a 520-kHz, 2.1-A low-side NMOS 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 switch RDS(ON). It delivers up to 90% efficiency in portable LCD backlighting and USB-powered white LED current source applications.
For engineers reviewing the LM2735YMFX/NOPB datasheet, LM2735YMFX/NOPB pinout, LM2735YMFX/NOPB application, or LM2735YMFX/NOPB equivalent, this page provides verified pin functions, real-world efficiency curves at 12 V/20 V outputs, soft-start timing (4 ms), shutdown quiescent current (80 nA), and validated alternative options for boost converter design.
Technical Context
The LM2735YMFX/NOPB implements fixed-frequency current-mode control with internal compensation and a 520-kHz oscillator, enabling stable regulation without external loop components. Its architecture integrates pulse-by-pulse current limiting, thermal shutdown at 160°C, and logic-high enable functionality.
It operates as a low-side switch regulator requiring an external diode and inductor, supporting both boost and SEPIC topologies. The device uses a 1.255-V internal reference and achieves ±2% VFB accuracy over –40°C to 125°C, with duty cycle range of 2%–99% and maximum switch current of 2.1 A across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz - enables use of small 15-µH SMD inductors and chip capacitors, minimizing PCB area |
| Max Switch Current | 2.1 A - supports ≥350 mA output at 12 V with margin for transient loads |
| RDS(ON) | 170 mΩ - reduces conduction loss and improves efficiency above 85% at mid-load |
| VFB Accuracy | ±2% - ensures tight output voltage regulation without trimming resistors |
| Soft Start Time | 4 ms - controls output ramp rate to limit inrush current into output capacitance |
| Shutdown IQ | 80 nA - extends battery life in always-on portable systems during standby |
| Input Voltage Range | 2.7 V–5.5 V - compatible with single-cell Li-ion, Li-poly, and 3.3 V/5 V rail inputs |
Pinout & Package
SOT-23-5 package (1.60 mm × 2.90 mm) with exposed pad not present; thermally optimized for low-power boost conversion on compact PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies power stage; must be decoupled near pin with ≥22 µF X5R ceramic capacitor |
| SW | Switch node | Connects to inductor and catch diode anode; high dv/dt node requiring short trace routing |
| EN | Enable control | Logic-high active; must not float or exceed VIN + 0.3 V; drives shutdown mode at 80 nA IQ |
| FB | Feedback input | Connects to resistor divider; sets output voltage via VOUT = VFB × (1 + R1/R2) |
| GND | Signal ground | Reference for FB and EN; place bottom feedback resistor adjacent to this pin |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation network-reduces BOM count and layout sensitivity |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response without external slope compensation |
| Ultra-low shutdown current | 80 nA enables >1-year battery life in coin-cell–powered devices during sleep mode |
| Fixed 520-kHz frequency | Enables consistent EMI filtering design and predictable inductor sizing across production lots |
| Thermal shutdown | Activates at 160°C junction temperature with 10°C hysteresis-prevents permanent damage under overload |
Applications
| LCD Display Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving parallel strings of white LEDs in handheld medical monitors and industrial HMIs. IC Role / Device Role / Timing Role: Boost regulator generating stable 12–20 V from 3.3 V or 5 V system rail to bias LED strings. Use Value: Delivers 350 mA at 12 V with >88% efficiency and minimal thermal rise in SOT-23 footprint. | Use Scenario: Providing regulated 15 V bias for OLED pixel driver ICs in portable test equipment displays. IC Role / Device Role / Timing Role: SEPIC converter maintaining regulation during input brownout down to 2.7 V while isolating input/output grounds. Use Value: Maintains ±2% output accuracy across –40°C to 85°C ambient with no external compensation required. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Generating 5 V or 9 V from USB 5 V input for auxiliary sensors or RF modules in portable analyzers. IC Role / Device Role / Timing Role: Boost converter with logic-enable shutdown to meet USB suspend current limits (<100 µA). Use Value: Achieves 80 nA shutdown IQ and 4-ms soft start-eliminates inrush-triggered USB port reset. | Use Scenario: Powering CCD/CMOS image sensor bias rails and flash LED drivers in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Dual-output boost controller (using two LM2735YMFX/NOPB) for analog and digital sensor supplies. Use Value: Enables 12 V @ 200 mA and 5 V @ 300 mA from single Li-ion cell with independent enable control per rail. |
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 vs. 520 kHz; same pinout and package but higher RDS(ON) (190 mΩ in WSON) | Better suited for ultra-compact layouts needing <10 µH inductors; lower efficiency at high load due to increased switching loss | Select when board space is constrained and 12 V/200 mA output suffices |
| TPS61040DRVR | 600-kHz frequency, 0.5-A switch current, 5-pin SOT-23, ±1.5% VFB accuracy, 25-µA operating IQ | Lower current capability limits use to ≤150 mA outputs; lacks thermal shutdown and has no SEPIC support | Select only for low-power, cost-sensitive applications where 2.1-A peak current is unnecessary |
Compared with LM2735YMFX/NOPB, LM2735XMF/NOPB trades efficiency for smaller magnetics, while TPS61040DRVR offers tighter VFB tolerance but sacrifices robustness, current headroom, and topology flexibility-making LM2735YMFX/NOPB optimal for 350+ mA boost/SEPIC designs requiring thermal protection and wide input range.
Availability
LM2735YMFX/NOPB is available at Aetrix Electronics and suitable for LCD backlighting, USB-powered peripherals, and digital camera power management requiring stable component supply and long-term industrial availability.
Supply support for LM2735YMFX/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 delivering analog and embedded processing solutions with leadership in power management ICs.
The LM2735 product line targets space-constrained portable electronics requiring efficient, easy-to-design boost and SEPIC DC/DC conversion with minimal external components.
FAQ
What is the maximum output voltage achievable with LM2735YMFX/NOPB?
The LM2735YMFX/NOPB supports output voltages up to 24 V when configured in boost topology, limited by the 26.5-V absolute maximum SW pin rating and external diode/voltage-divider selection. At 24 V output, efficiency drops to ~75% at full 350 mA load with 5 V input, per TI's typical efficiency curves. Designers must verify thermal performance using RθJA = 164.2°C/W for the SOT-23 package under actual board conditions.
Does LM2735YMFX/NOPB support SEPIC topology, and what external components are required?
Yes, LM2735YMFX/NOPB supports SEPIC topology using two coupled inductors or a single coupled inductor with center tap, plus one capacitor and one diode. Unlike boost, SEPIC provides input-output isolation and can regulate output even if input drops below output voltage. Required external components include: input capacitor (≥22 µF), output capacitor (≥10 µF), coupling capacitor (≥10 µF), diode (Schottky, 20 V rating), and inductor(s). No changes to LM2735YMFX/NOPB configuration are needed-only the external passive network differs.
What is the purpose of the AGND pin, and why is it separate from GND on some LM2735 variants?
The LM2735YMFX/NOPB does not have an AGND pin-it uses a single GND pin (Pin 2) for both signal and power return, as confirmed by its SOT-23-5 pinout in the datasheet. AGND appears only on the 6-pin WSON and 8-pin MSOP-PowerPAD variants to separate analog reference ground from power ground, improving noise immunity for the feedback amplifier. Since LM2735YMFX/NOPB is the SOT-23 version, all ground-referenced circuitry shares the single GND pin, and layout best practice is to place the bottom feedback resistor directly adjacent to it.
How does the soft-start function of LM2735YMFX/NOPB operate, and can it be adjusted?
The LM2735YMFX/NOPB implements internal soft-start with a fixed 4-ms ramp time, during which the internal error amplifier reference voltage rises linearly from 0 V to 1.255 V. This controls output voltage slew rate and limits inrush current into output capacitors. Soft-start timing is not adjustable-no external capacitor or resistor modifies it. Designers must size the output capacitor to ensure peak inrush current stays within diode and switch SOA limits; typical designs use 10–22 µF X5R ceramics with low ESR.
Is LM2735YMFX/NOPB qualified for automotive applications?
No, LM2735YMFX/NOPB is not automotive-qualified. It is rated for industrial temperature range (–40°C to +125°C) but lacks AEC-Q100 qualification, automotive-specific testing, or PPAP documentation. For automotive use, TI specifies the LM2735-Q1 variant, which undergoes extended reliability testing, includes enhanced ESD protection (±4 kV HBM), and is manufactured in IATF 16949-certified facilities. LM2735YMFX/NOPB should only be used in consumer, industrial, or medical portable equipment-not in vehicle infotainment, ADAS, or body control modules.
LM2735YMFX/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
LM2735YMFX/NOPB FAQ
1.How can I place an order for LM2735YMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735YMFX/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 LM2735YMFX/NOPB reliable?
The price and inventory of LM2735YMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735YMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735YMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735YMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735YMFX/NOPB?
LM2735YMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735YMFX/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 LM2735YMFX/NOPB?
For technical support, including LM2735YMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735YMFX/NOPB requirements.
6.How does Aetrix verify that LM2735YMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735YMFX/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 LM2735YMFX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735YMFX/NOPB?
All LM2735YMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735YMFX/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 LM2735YMFX/NOPB part is unused and in its original packaging.
Return procedure for LM2735YMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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