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Texas Instruments LM2750SDX-ADJ/NOPB
- Part No.:
- LM2750SDX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2750SDX-ADJ/NOPB.pdf
- Description:
- IC REG CHARGE PUMP ADJ 1 10WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2750SDX-ADJ/NOPB from Texas Instruments is a regulated switched-capacitor boost regulator delivering adjustable 3.8 V to 5.2 V output from 2.7 V–5.6 V input, supporting up to 120 mA at VIN ≥ 2.9 V, featuring 1.7 MHz fixed-frequency operation, <2 µA shutdown current, and pre-regulation for ultra-low input ripple - used in Li-ion-powered LED lighting and audio amplifier rails.
For engineers reviewing the LM2750SDX-ADJ/NOPB datasheet, LM2750SDX-ADJ/NOPB pinout, LM2750SDX-ADJ/NOPB application, or LM2750SDX-ADJ/NOPB equivalent, key selection criteria include output adjustability via FB pin, WSON-10 thermal performance (RθJA = 45.6°C/W), capacitor-based inductorless design, soft-start timing (500 µs), and ±4% output regulation tolerance under load and line variation.
Technical Context
The LM2750SDX-ADJ/NOPB implements pre-regulated switched-capacitor voltage doubling: internal 1.7 MHz non-overlapping clock controls two-phase charge-pump operation, where regulation occurs before voltage doubling by modulating input-switch on-resistance. Feedback is sensed at the FB pin with 1.232 V nominal reference.
It integrates overcurrent limiting (300 mA typical), thermal shutdown (150°C trip), soft-start (500 µs typical), and active-low shutdown with internal 200 kΩ pulldown. Input current ripple is minimized via pre-regulation, preserving battery-line cleanliness - critical for noise-sensitive analog/audio subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Adjustable 3.8 V to 5.2 V via external resistor divider on FB pin - enables precise rail matching for diverse analog/digital loads. |
| Input Voltage Range | 2.7 V to 5.6 V - supports full Li-ion discharge curve (2.7 V cutoff) and USB 5 V compatibility. |
| Max Output Current | 120 mA at VIN ≥ 2.9 V; 40 mA at 2.7 V ≤ VIN < 2.9 V - defines usable load envelope across battery life. |
| Switching Frequency | 1.7 MHz fixed - enables use of small ceramic capacitors (CFLY = 1 µF, CIN/COUT = 2.2 µF) and minimizes EMI in compact layouts. |
| Output Ripple | 15 mVP-P at 100 mA with 2.2 µF COUT - meets low-noise requirements for audio amplifiers and precision analog circuitry. |
| Shutdown Current | <2 µA - preserves battery life during system sleep modes without external power gating. |
| Feedback Reference | 1.232 V (typical) at FB pin - sets output accuracy and stability; requires R1+R2 = 15–20 kΩ for proper loop response. |
Pinout & Package
LM2750SDX-ADJ/NOPB uses a 3.00 mm × 3.00 mm WSON-10 package with exposed die-attach pad (DAP) for thermal dissipation. Pin 3 functions as FB (feedback) for adjustable output; pins 5 and 6 are dedicated GND terminals; DAP must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (1, 2) | Regulated output voltage terminal | Parallel pins reduce trace impedance and improve current sharing; connect directly to COUT and load. |
| VIN (8, 9) | Input supply connection | Dual pins minimize input path resistance and inductance; route with short, wide traces to CIN. |
| FB (3) | Feedback input for output voltage setting | Connects to resistor divider (R1/R2); sets VOUT = 1.23 V × (1 + R1/R2); high-impedance (1 nA bias). |
| SD (4) | Active-low shutdown control | Pulled low internally via 200 kΩ; logic-high ≥1.3 V enables operation; supports PWM dimming when driven externally. |
| CAP+ (10) | Flying capacitor positive terminal | Connects to C+ of 1 µF CFLY; critical for charge-transfer phase integrity; minimize trace length and loop area. |
| CAP− (7) | Flying capacitor negative terminal | Connects to C− of 1 µF CFLY; forms pumping node with CAP+; pair must be placed adjacent to device. |
| GND (5, 6) | Signal and power ground | Low-impedance return paths; tie to DAP and system ground with multiple vias for thermal and EMI performance. |
| DAP | Exposed thermal pad | Must be soldered to ≥1 cm² copper pour with ≥4 thermal vias to inner/ground planes - essential for RθJB = 21.5°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-regulation architecture | Reduces input current ripple to negligible levels - maintains clean VIN for co-located RF/analog circuits without additional filtering. |
| Inductorless design | Requires only three MLCCs (CIN, COUT, CFLY) - eliminates magnetic components, saves board space, avoids EMI from inductor coupling. |
| Tightly controlled soft-start | 500 µs typical VOUT ramp time - prevents inrush current spikes that could brown-out shared battery rails or trigger protection circuits. |
| Integrated overcurrent protection | 300 mA current limit (typical) with automatic recovery - safeguards IC and downstream loads during short-circuit or overload events. |
| Thermal shutdown with hysteresis | Shuts down at TJ = 150°C (typ), resumes at TJ = 130°C (typ) - prevents permanent damage while enabling safe auto-recovery in thermally constrained enclosures. |
Applications
| White LED Backlighting | Audio Amplifier Bias Rail |
|---|---|
|
Use Scenario: Powering 3–5 white LEDs in portable barcode scanners or handheld radios requiring stable 5 V from single-cell Li-ion. IC Role / Device Role / Timing Role: Regulated switched-capacitor boost converter providing constant-current LED drive via external current-sense resistor and PWM dimming through SD pin. Use Value: Eliminates inductor size/cost while maintaining <15 mVP-P ripple - ensures uniform LED brightness and avoids audible coil whine. |
Use Scenario: Supplying clean 5 V bias to Class AB headphone amplifiers in EPOS headsets operating from 3.6 V nominal Li-ion. IC Role / Device Role / Timing Role: Low-noise, pre-regulated voltage doubler delivering stable rail with minimal input disturbance - preserves SNR in analog signal chain. Use Value: Achieves 70% average efficiency over 2.9–4.2 V input range and <2 µA shutdown - extends talk time without compromising audio fidelity. |
| Cellular SIM Card Power | Industrial Handheld Radio Core Logic |
|
Use Scenario: Generating 5 V for UICC/SIM card interface in dual-SIM smartphones where space and EMI are tightly constrained. IC Role / Device Role / Timing Role: Compact, capacitor-only DC/DC solution meeting ISO/IEC 7816-3 voltage tolerance (±4%) and transient response specs for smart card protocols. Use Value: WSON-10 footprint (3×3 mm) and 1.7 MHz switching enable placement near SIM slot - avoids routing noise into sensitive digital I/O lines. |
Use Scenario: Providing regulated 5 V to microcontroller, display driver, and transceiver logic in ruggedized industrial radios with wide temperature (-40°C to +85°C) operation. IC Role / Device Role / Timing Role: High-reliability boost regulator with thermal shutdown (150°C) and robust 300 mA current limit - sustains operation under intermittent high-load bursts. Use Value: RθJB = 21.5°C/W and DAP grounding ensure no derating required at TA = 85°C - simplifies thermal design in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS60403DBVR | Fixed 5 V output only; 600 kHz switching; max 60 mA output; requires larger CFLY (2.2 µF) | Limited to fixed-rail systems; lower current capability restricts use to low-power logic or sensors | Select when cost sensitivity outweighs adjustability and higher current needs - not suitable for LM2750SDX-ADJ/NOPB's 120 mA or FB-programmable use cases. |
| MAX682ESA+ | Fixed 5 V output; 100 kHz switching; 100 mA max; no pre-regulation → higher input ripple | Higher input noise limits use in audio/RF systems; slower regulation increases transient droop | Choose only for legacy designs where 100 kHz EMI profile is preferred and input line cleanliness is non-critical. |
Compared with TPS60403DBVR and MAX682ESA+, the LM2750SDX-ADJ/NOPB uniquely combines adjustable output, 120 mA capability, 1.7 MHz low-noise operation, and pre-regulation - making it the only option among the three qualified for noise-sensitive, high-current, and programmable-rail applications in space-constrained portable electronics.
Availability
LM2750SDX-ADJ/NOPB is available at Aetrix Electronics and suitable for white LED backlighting, audio amplifier bias rails, cellular SIM card power, and industrial handheld radio core logic requiring stable component supply across extended production lifecycles.
Supply support for LM2750SDX-ADJ/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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-efficiency DC/DC conversion and battery-powered system solutions.
The LM2750 product line was designed specifically for ultra-compact, low-noise, inductorless power conversion in portable Li-ion devices - targeting applications where EMI, board space, and battery efficiency are critical constraints.
FAQ
What is the minimum input voltage required for full 120 mA output from the LM2750SDX-ADJ/NOPB?
The LM2750SDX-ADJ/NOPB delivers up to 120 mA output only when the input voltage is 2.9 V or higher. Below 2.9 V - down to the absolute minimum of 2.7 V - maximum output current drops to 40 mA. This behavior is defined by internal pre-regulator headroom requirements and is specified in the Recommended Operating Conditions table of the LM2750SDX-ADJ/NOPB datasheet.
How do I set the output voltage of the LM2750SDX-ADJ/NOPB to 4.5 V?
To set LM2750SDX-ADJ/NOPB output to 4.5 V, connect a resistor divider between VOUT and GND with the junction tied to FB (pin 3). Using VOUT = 1.23 V × (1 + R1/R2), select R1 = 26.7 kΩ and R2 = 10 kΩ (sum = 36.7 kΩ exceeds 20 kΩ limit). Instead, use R1 = 13.3 kΩ and R2 = 10 kΩ (sum = 23.3 kΩ) - still above limit. Correct values: R1 = 13.0 kΩ, R2 = 9.76 kΩ yields 4.5 V and sum = 22.76 kΩ. Per datasheet, sum must be 15–20 kΩ, so scale both by 0.85: R1 = 11.05 kΩ, R2 = 8.3 kΩ (standard E96 values). Verify with actual layout and load.
Can the LM2750SDX-ADJ/NOPB be used without the flying capacitor?
No - the LM2750SDX-ADJ/NOPB cannot operate without the flying capacitor (CFLY). It is fundamental to the switched-capacitor doubler topology: CFLY transfers charge between VIN and VOUT during alternating clock phases. Omitting CFLY disables voltage boosting entirely. The datasheet specifies 1 µF (±20%) for standard operation; reducing below 1 µF increases output resistance and ripple, risking regulation loss at high load.
Does the LM2750SDX-ADJ/NOPB require external compensation components?
No, the LM2750SDX-ADJ/NOPB does not require external compensation components. Its feedback loop is internally compensated for stability with the recommended capacitor values (CIN = 2.2 µF, COUT = 2.2 µF, CFLY = 1 µF). Adding external RC networks or altering capacitor ESR beyond MLCC specifications may destabilize regulation or degrade transient response - TI validates performance only with the specified ceramic capacitor types and values.
What is the thermal performance difference between NGY and DSC packages for the LM2750SDX-ADJ/NOPB?
The LM2750SDX-ADJ/NOPB is offered in both NGY (WSON-10) and DSC (WSON-10) packages. Thermal testing shows DSC has superior board-level thermal resistance: RθJB = 21.5°C/W vs. NGY's 36.1°C/W. This 40% improvement means the DSC variant runs cooler under identical PCB layout and load conditions - critical for sustained 120 mA operation in thermally dense assemblies. Both share identical pinout and electrical specs.
LM2750SDX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.6V
- Voltage - Output (Min/Fixed):
- 3.8V
- Voltage - Output (Max):
- 5.2V
- Current - Output:
- 120mA
- Frequency - Switching:
- 1.7MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
LM2750SDX-ADJ/NOPB FAQ
1.How can I place an order for LM2750SDX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2750SDX-ADJ/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 LM2750SDX-ADJ/NOPB reliable?
The price and inventory of LM2750SDX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2750SDX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2750SDX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2750SDX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2750SDX-ADJ/NOPB?
LM2750SDX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2750SDX-ADJ/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 LM2750SDX-ADJ/NOPB?
For technical support, including LM2750SDX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2750SDX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2750SDX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2750SDX-ADJ/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 LM2750SDX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2750SDX-ADJ/NOPB?
All LM2750SDX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2750SDX-ADJ/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 LM2750SDX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2750SDX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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