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Texas Instruments LM2735YMF
- Part No.:
- LM2735YMF
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2735YMF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,664
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Product details
Overview
LM2735YMF 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 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 LCD backlighting and USB-powered portable systems.
For engineers reviewing the LM2735YMF datasheet, LM2735YMF pinout, LM2735YMF application, or LM2735YMF equivalent, key selection criteria include switching frequency (520 kHz), internal compensation, soft-start timing (4 ms), ultra-low shutdown current (80 nA), and thermal shutdown at 160°C - all critical for space-constrained, battery-sensitive designs.
Technical Context
The LM2735YMF 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 allows use of compact 10–22 µF input and 10 µF output ceramic capacitors and ≤22 µH surface-mount inductors.
It integrates pulse-by-pulse current limiting (2.1 A min), thermal shutdown (160°C trip, 10°C hysteresis), and logic-high enable with 0.4 V shutdown threshold. The 1.255 V reference (±2% over –40°C to 125°C) feeds a resistor-divider on FB to set output voltage precisely from 3 V to 24 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz - enables use of small 10–22 µF ceramic input/output caps and ≤22 µH SMD inductors, minimizing PCB area. |
| Max Switch Current | 2.1 A - supports ≥350 mA output at 12 V (boost) with margin for transient loads and startup inrush. |
| Feedback Voltage | 1.255 V ±2% - sets output via resistor divider; accuracy ensures stable 3–24 V regulation across temperature. |
| RDS(ON) | 170 mΩ - reduces conduction loss at high duty cycles, improving efficiency in high-VOUT/low-VIN configurations. |
| Shutdown Current | 80 nA - extends battery life in always-on portable devices during standby or sleep modes. |
| Soft Start Time | 4 ms - controls output ramp rate to limit inrush current into output capacitance, preventing input rail sag. |
| UVLO Threshold | 2.3 V (rising), 1.9 V (falling) - prevents erratic operation during brown-out and ensures clean start-up from weak batteries. |
Pinout & Package
SOT-23-5 package (1.60 mm × 2.90 mm), thermally enhanced with exposed pad (PGND-connected) in DBV variant; LM2735YMF uses this 5-pin configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Supplies power stage; accepts 2.7–5.5 V; must be decoupled locally with ≥22 µF ceramic cap near pin. |
| SW | Switch node | Drives external inductor and catch diode; swings from GND to VOUT + VF; requires short, low-inductance trace. |
| FB | Feedback input | Connects to resistor divider (R1/R2) from VOUT; sets regulated output voltage per VOUT = VFB × (1 + R2/R1). |
| EN | Enable control | Logic-high active; 0.4 V threshold ensures reliable disable; must not exceed VIN + 0.3 V to avoid damage. |
| GND | Signal & power ground | Common return for FB divider, input cap, and PGND; place bottom FB resistor directly adjacent to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity in boost/SEPIC designs. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response without requiring slope compensation. |
| Ultra-low shutdown current | 80 nA enables multi-year battery life in IoT sensors and remote controls where device spends >99% time in shutdown. |
| Integrated soft start | 4 ms internal ramp prevents output overshoot and limits inrush into large output capacitors (e.g., 10–100 µF). |
| Thermal shutdown with hysteresis | 160°C trip / 150°C recovery prevents latch-up during overload or poor heatsinking; protects IC during sustained overtemp. |
Applications
| LCD Backlight Power Supply | OLED Panel Bias Supply |
|---|---|
|
Use Scenario: Driving white LED strings (3–6 LEDs in series) from single-cell Li-ion (3.0–4.2 V) in smartphones and tablets. IC Role / Device Role / Timing Role: Boost regulator providing regulated 12–24 V output with current-mode stability under dynamic LED dimming loads. Use Value: 520-kHz switching enables <2.5 mm² total solution size using 15 µH inductor and 10 µF ceramic output cap - critical for thin bezel designs. |
Use Scenario: Generating 15–20 V bias rails for OLED display source drivers in wearables and AR glasses. IC Role / Device Role / Timing Role: SEPIC converter delivering stable output despite input voltage collapse during RF transmission bursts. Use Value: Internal soft start (4 ms) and ±2% VFB accuracy ensure flicker-free panel startup and consistent brightness across battery discharge. |
| USB-Powered Portable Instrument | Digital Camera Flash Charging |
|
Use Scenario: Powering 5 V analog front-end and 12 V op-amp rails from USB 5 V supply in handheld test equipment. IC Role / Device Role / Timing Role: Compact boost regulator with logic-enable sequencing for controlled subsystem power-up. Use Value: 80 nA shutdown current preserves USB bus power budget during idle; SOT-23-5 footprint fits within 6 mm × 6 mm board area. |
Use Scenario: Charging high-voltage capacitor (300–400 V) for xenon flash via intermediate 12 V rail in compact digital cameras. IC Role / Device Role / Timing Role: Primary-stage boost converter supplying isolated flyback controller with tightly regulated 12 V input. Use Value: 2.1 A switch current and 170-mΩ RDS(ON) support rapid capacitor charging (<500 ms) while maintaining >85% efficiency at 300 mA load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2735XMF | 1.6 MHz switching frequency; higher quiescent current (7 mA vs. 3.4 mA); same 2.1 A switch rating and pinout. | Better suited for ultra-compact layouts needing smallest possible inductors/caps; trades off slightly lower light-load efficiency. | Select LM2735XMF when board area is constrained below 15 mm² and EMI filtering favors higher fundamental frequency. |
| TPS61040DBVR | Fixed 500-kHz frequency; 0.5-A switch current; no internal soft start; requires external compensation; SOT-23-5. | Limited to ≤150 mA output at 12 V; lacks thermal shutdown and precise VFB accuracy (±2.5%). | Choose TPS61040DBVR only for cost-sensitive, low-power applications (<100 mA) where full LM2735YMF feature set is unnecessary. |
Compared with LM2735XMF, LM2735YMF offers lower quiescent current and better light-load efficiency at the expense of larger passive components; versus TPS61040DBVR, it provides higher current capability, integrated protection, and tighter regulation - making LM2735YMF optimal for mid-power portable boost applications demanding reliability and design simplicity.
Availability
LM2735YMF is available at Aetrix Electronics and suitable for LCD backlighting, USB-powered instrumentation, and digital camera power management requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM2735YMF 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 specializing in analog and embedded processing solutions, with leadership in power management ICs for portable, industrial, and automotive markets.
The LM2735YMF belongs to TI's space-efficient DC/DC regulator product line, designed specifically for compact boost and SEPIC conversion in battery-powered consumer electronics where PCB area, efficiency, and ease of design are critical.
FAQ
What is the switching frequency of the LM2735YMF?
The LM2735YMF operates at a fixed 520 kHz switching frequency. This value is factory-trimmed and remains stable across –40°C to 125°C ambient temperature, with typical variation of ±30% over full conditions. The 520 kHz frequency enables use of small 10–22 µF ceramic capacitors and ≤22 µH surface-mount inductors, reducing total solution size compared to lower-frequency alternatives. LM2735YMF does not support frequency adjustment or synchronization.
Does the LM2735YMF require external compensation components?
No, the LM2735YMF features fully internal compensation optimized for standard boost and SEPIC configurations. Its current-mode architecture eliminates the need for external compensation networks such as RC or R-CF combinations. Designers can implement stable regulation using only the required input/output capacitors, inductor, feedback resistors, and catch diode - significantly reducing BOM count and layout complexity. LM2735YMF maintains phase margin >45° across all recommended operating conditions without added components.
What is the maximum output voltage achievable with the LM2735YMF?
The LM2735YMF supports output voltages from 3 V up to 24 V, set by the external resistor divider connected to the FB pin. The upper limit is constrained by the absolute maximum SW pin voltage rating of 26.5 V and practical considerations including diode reverse voltage rating and capacitor voltage derating. At 24 V output, the device maintains ≥80% efficiency with 5 V input and 200 mA load, verified in TI's typical characteristics (Figure 10). Output voltage accuracy is ±2% due to the 1.255 V ±2% internal reference.
How does the enable (EN) pin function on the LM2735YMF?
The EN pin on the LM2735YMF is a logic-high active enable input with a 0.4 V threshold. When pulled below 0.4 V, the device enters shutdown mode, reducing quiescent current to 80 nA. When driven above 1.8 V, regulation begins after internal soft start (4 ms). The pin must never float or exceed VIN + 0.3 V to prevent damage. No pull-up or pull-down resistor is required if driven actively; however, a 100-kΩ pull-down is recommended in systems where EN may be unconnected during power-up.
Is the LM2735YMF pin-compatible with other variants in the LM2735 family?
Yes, the LM2735YMF (520 kHz, SOT-23-5) shares identical pinout and footprint with LM2735XMF (1.6 MHz, SOT-23-5) and LM2735ZMF (SEPIC-optimized, same package). All three variants use the DBV package with VIN, SW, FB, EN, and GND pins in identical positions and electrical roles. This allows direct substitution between Y/X/Z versions without PCB changes - only the switching frequency and minor parameter tolerances differ. Thermal performance and maximum output current remain identical across all SOT-23-5 variants.
LM2735YMF 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2735YMF FAQ
1.How can I place an order for LM2735YMF through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735YMF 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 reliable?
The price and inventory of LM2735YMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735YMF is usually 5 days.
3.What payment methods are accepted for LM2735YMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735YMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735YMF?
LM2735YMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735YMF 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?
For technical support, including LM2735YMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735YMF requirements.
6.How does Aetrix verify that LM2735YMF is sourced from the original manufacturer or authorized distributors?
All LM2735YMF 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 meets industry standards.
7.What is the process for return or replacement of LM2735YMF?
All LM2735YMF units undergo pre-shipment inspection (PSI). If there is an issue with LM2735YMF, 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 part is unused and in its original packaging.
Return procedure for LM2735YMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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