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Texas Instruments LM2735YQSD/NOPB
- Part No.:
- LM2735YQSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2735YQSD/NOPB.pdf
- Description:
- IC REG BST FLYBCK ADJ 2.1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
LM2735YQSD/NOPB from Texas Instruments is a 520-kHz, 2.1-A low-side switch boost/SEPIC DC/DC regulator in a 6-pin WSON package. It operates from 2.7 V to 5.5 V input, delivers up to 24 V output, features ±2% feedback voltage accuracy (1.255 V nominal), 170-mΩ NMOS switch, and 80 nA shutdown current. It is used in portable LCD backlighting where space-constrained, high-efficiency step-up conversion is required.
For engineers reviewing the LM2735YQSD/NOPB datasheet, LM2735YQSD/NOPB pinout, LM2735YQSD/NOPB application, or LM2735YQSD/NOPB equivalent, key selection criteria include switching frequency (520 kHz), output voltage programmability via FB resistor divider, thermal shutdown (160°C), soft-start timing (4 ms), and compatibility with small SMD inductors and ceramic capacitors in space-sensitive designs.
Technical Context
The LM2735YQSD/NOPB implements constant-frequency peak current-mode control with internal compensation, enabling stable regulation across wide load and line variations without external loop components. Its architecture integrates a 520-kHz oscillator, pulse-by-pulse current limiting, and thermal shutdown-ensuring robust operation in portable power rails.
It uses a single NMOS low-side switch with 170-mΩ RDS(ON) at 25°C, supports SEPIC and boost topologies, and relies on external diode and inductor for energy transfer. The FB pin senses output voltage via resistive divider, referenced to 1.255 V with ±2% accuracy over –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 520 kHz - enables use of compact 1–10 µH SMD inductors and reduces output ripple without increasing EMI filtering complexity. |
| Max Switch Current | 2.1 A - supports ≥350 mA output at 12 V (boost) with margin for transient loads and efficiency derating. |
| Feedback Voltage | 1.255 V ±2% - sets precise output voltage via external resistor divider; accuracy maintained from 0°C to 125°C for stable regulation. |
| RDS(ON) | 170 mΩ - minimizes conduction loss at full load; contributes to >90% peak efficiency in typical 5 V → 12 V boost applications. |
| Shutdown Current | 80 nA - preserves battery life in always-on portable systems; enables ultra-low-power sleep modes without auxiliary circuitry. |
| Soft-Start Time | 4 ms - controls output ramp rate to limit inrush current into output capacitors, preventing input supply sag or brownout. |
| UVLO Threshold | 2.3 V (rising), 1.9 V (falling) - prevents erratic startup/shutdown near battery depletion; provides 400 mV hysteresis for noise immunity. |
Pinout & Package
LM2735YQSD/NOPB is housed in a thermally enhanced 6-pin WSON (NGG) package measuring 3.00 mm × 3.00 mm with exposed thermal pad (DAP). The DAP must be connected to PGND via ≥4 vias for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Supplies power stage; accepts 2.7–5.5 V; requires local 22-µF ceramic bypass capacitor placed near pin. |
| SW | Switch Node | Drives external inductor and catch diode; swings from GND to VOUT + VF; layout critical for EMI and efficiency. |
| FB | Feedback Input | Senses output voltage via resistor divider; high-impedance (0.1 µA bias); place bottom resistor adjacent to AGND. |
| EN | Enable Control | Active-high logic input; <0.4 V disables regulator; must not exceed VIN + 0.3 V; floats to disable if unconnected. |
| AGND | Analog Ground | Reference for FB and error amplifier; separate from PGND in layout to avoid noise coupling into feedback path. |
| PGND | Power Ground | Return path for switch current; connect directly to DAP and output capacitor ground; minimize loop area with SW and VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Compensation | Eliminates need for external compensation network-reduces BOM count and design iteration time for standard boost/SEPIC layouts. |
| Current-Mode Control | Provides inherent cycle-by-cycle current limiting and fast transient response (<10 µs) to load steps without external sensing. |
| Logic-High Enable | Simplifies system-level power sequencing; compatible with standard GPIOs; no pull-up required for default-disable behavior. |
| Ultra-Low Shutdown Current | 80 nA ensures ≤1 µA total system standby draw when paired with low-leakage diode and capacitors-critical for multi-year battery life. |
| Thermal Shutdown | Activates at 160°C junction temperature with 10°C hysteresis; protects against sustained overload or poor PCB heatsinking without external sensors. |
Applications
| Portable LCD Backlighting | OLED Panel Power Supply |
|---|---|
Use Scenario: Driving white LED strings (3–6 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 rail; 520-kHz switching avoids audible noise while enabling <2-mm² solution size. Use Value: Delivers >88% efficiency at 350 mA load with minimal thermal rise in thin-profile devices; soft-start prevents display flash during power-on. | Use Scenario: Generating bias voltages (VDD, VSS) for AMOLED displays requiring tightly regulated ±10 V rails from 3.3 V system supply. IC Role / Device Role / Timing Role: SEPIC converter delivering non-inverting, isolated-like output; 520-kHz frequency allows use of 4.7-µH shielded inductors under 1 mm height. Use Value: Maintains regulation during battery voltage sag (down to 2.7 V); ±2% FB accuracy ensures consistent OLED luminance and color fidelity. |
| USB-Powered Devices | Digital Still Cameras |
Use Scenario: Powering 5-V peripherals (e.g., USB audio DACs, sensors) from 5-V USB host port with variable source impedance. IC Role / Device Role / Timing Role: Boost regulator stepping 4.75–5.25 V USB input to stable 5.0 V output; operates in 100% duty cycle mode near input limit. Use Value: UVLO hysteresis prevents oscillation during USB port hot-plug; 80 nA shutdown enables zero-power disconnect detection via microcontroller GPIO. | Use Scenario: Supplying 12 V flash LED driver and 3.3 V image sensor core from dual-cell alkaline (1.8–3.2 V) in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: Dual-output boost/SEPIC controller; first stage boosts to 12 V for flash, second regulates 3.3 V from intermediate rail. Use Value: 2.1-A switch supports 1-A flash pulses without dropout; thermal shutdown prevents lens motor interference during extended burst capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2735XQSD/NOPB | 1.6-MHz switching frequency; higher RDS(ON) (190 mΩ); same package and pinout. | Better suited for ultra-compact layouts needing <1 µH inductors; lower efficiency at high load due to increased switching loss. | Select LM2735XQSD/NOPB when board area is constrained below 15 mm² and input voltage remains ≥3.3 V. |
| TPS61088RHLR | Higher 5-A switch current; 2.5-V to 12-V input; adjustable 2.5–18-V output; 12-pin WQFN package. | Supports wider input range and higher output power; requires external compensation and more external components. | Choose TPS61088RHLR for applications demanding >500 mA output or input down to 2.5 V, accepting larger solution size and design effort. |
Compared with LM2735XQSD/NOPB, the LM2735YQSD/NOPB trades higher efficiency at medium loads for relaxed EMI filtering and lower inductor cost; versus TPS61088RHLR, it offers simpler implementation and smaller footprint at the expense of output flexibility and peak current capability.
Availability
LM2735YQSD/NOPB is available at Aetrix Electronics and suitable for portable LCD backlighting, OLED panel power supplies, and USB-powered devices requiring stable component supply, long-term manufacturability, and automotive-grade reliability screening.
Supply support for LM2735YQSD/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM2735 product line delivers space-efficient, easy-to-use boost and SEPIC regulators targeting portable and battery-powered applications where small solution size, low quiescent current, and robust thermal performance are essential.
FAQ
What is the maximum output voltage achievable with LM2735YQSD/NOPB?
The LM2735YQSD/NOPB supports output voltages from 3 V to 24 V, set by an external resistor divider on the FB pin. The upper limit is constrained by the 26.5-V absolute maximum SW pin voltage rating and external diode reverse voltage rating. For reliable 24-V operation, a 30-V Schottky diode and appropriate output capacitor voltage rating must be selected. The LM2735YQSD/NOPB itself does not impose additional internal limits beyond those specified in its absolute maximum ratings.
Does LM2735YQSD/NOPB require external compensation components?
No, the LM2735YQSD/NOPB features fully internal compensation optimized for standard boost and SEPIC configurations. No external compensation network is needed for stable operation across its recommended operating conditions. This simplifies design, reduces BOM count, and eliminates tuning effort-though optional external compensation (e.g., C3 in TI's reference designs) may be added to further optimize transient response in demanding applications.
Can LM2735YQSD/NOPB operate in SEPIC topology?
Yes, the LM2735YQSD/NOPB is explicitly designed for both boost and SEPIC topologies. Its low-side NMOS switch, current-mode control, and integrated soft-start function support SEPIC operation with proper external component selection (coupled inductor or two discrete inductors, plus input/output capacitors and diode). TI provides validated SEPIC reference designs and WEBENCH® support for LM2735YQSD/NOPB-based SEPIC converters.
What is the thermal performance of LM2735YQSD/NOPB in the WSON package?
In the 6-pin WSON (NGG) package, the LM2735YQSD/NOPB has a junction-to-ambient thermal resistance (RθJA) of 54.9°C/W when mounted on a standard 4-layer PCB with 2-oz copper and adequate thermal vias to the DAP. With proper layout-including connection of the DAP to a solid ground plane via ≥4 thermal vias-the device sustains continuous 2.1-A switch current up to 125°C ambient, aided by thermal shutdown activation at 160°C junction temperature.
Is LM2735YQSD/NOPB pin-compatible with other LM2735 variants?
Yes, the LM2735YQSD/NOPB shares identical pinout and package (6-pin WSON NGG) with LM2735XQSD/NOPB and LM2735ZQSD/NOPB. All three variants are mechanically and electrically pin-compatible-differing only in factory-set switching frequency (520 kHz, 1.6 MHz, or 2.1 MHz) and minor parameter tolerances. No PCB redesign is required when substituting between these variants for frequency optimization.
LM2735YQSD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2735YQSD/NOPB FAQ
1.How can I place an order for LM2735YQSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2735YQSD/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 LM2735YQSD/NOPB reliable?
The price and inventory of LM2735YQSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2735YQSD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2735YQSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2735YQSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2735YQSD/NOPB?
LM2735YQSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2735YQSD/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 LM2735YQSD/NOPB?
For technical support, including LM2735YQSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2735YQSD/NOPB requirements.
6.How does Aetrix verify that LM2735YQSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2735YQSD/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 LM2735YQSD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2735YQSD/NOPB?
All LM2735YQSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2735YQSD/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 LM2735YQSD/NOPB part is unused and in its original packaging.
Return procedure for LM2735YQSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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