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Texas Instruments LM2750LDX-ADJ
- Part No.:
- LM2750LDX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2750LDX-ADJ.pdf
- Description:
- IC REG CHARGE PUMP ADJ 1 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,941
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Product details
Overview
LM2750LDX-ADJ from Texas Instruments is a regulated switched-capacitor boost regulator in a 10-pin WSON (3mm × 3mm) package, delivering adjustable output voltage (3.8V–5.2V) with up to 120mA output current at VIN ≥ 2.9V, 40mA at VIN ≥ 2.7V, and featuring 1.7MHz fixed switching frequency, pre-regulation for ultra-low input ripple, and shutdown current <2µA. It serves as a low-noise, inductorless power source for space-constrained Li-ion–powered systems.
For engineers reviewing the LM2750LDX-ADJ datasheet, LM2750LDX-ADJ pinout, LM2750LDX-ADJ application, or LM2750LDX-ADJ equivalent, key selection considerations include its adjustable feedback architecture (FB pin), 3-capacitor solution requirement (CIN/COUT/CFLY), thermal performance in WSON-10, soft-start timing (0.5ms), and output regulation limits across input voltage and load conditions.
Technical Context
The LM2750LDX-ADJ implements a two-phase non-overlapping switched-capacitor doubler with internal pre-regulation-modulating input-switch on-resistance before charge transfer-to achieve tight output regulation while minimizing input current ripple. Its feedback loop references a 1.232V (typ.) internal bandgap, enabling programmable VOUT via external resistor divider (R1/R2).
Operation requires three external ceramic capacitors: 2.2µF CIN, 2.2µF COUT, and 1µF CFLY. Output resistance is 5Ω (typ.), and thermal shutdown engages at TJ = 150°C (typ.) with hysteresis down to 135°C (typ.), supported by θJA = 55°C/W in standard PCB layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 3.8V to 5.2V, set by external R1/R2 divider per VOUT = 1.23V × (1 + R1/R2) |
| Input Voltage Range | 2.7V to 5.6V; for VOUT ≤ 4.9V, max VIN = VOUT + 0.7V |
| Max Output Current | 120mA (VIN ≥ 2.9V); 40mA (2.7V ≤ VIN ≤ 2.9V) |
| Switching Frequency | 1.7MHz (fixed), enabling compact 1µF flying capacitor and low output ripple |
| Feedback Reference Voltage | 1.232V (typ.) at FB pin, with ±5% tolerance over temperature and line/load |
| Shutdown Current | <2µA, achieved via active-low SD pin with internal 200kΩ pull-down |
| Output Ripple | 4mVp-p (COUT = 10µF, IOUT = 100mA); 15mVp-p (COUT = 2.2µF, IOUT = 100mA) |
| Peak Efficiency | 85% (VIN = 2.9V, IOUT = 120mA); 87% (VIN = 2.7V, IOUT = 40mA) |
Pinout & Package
LM2750LDX-ADJ is housed in a thermally enhanced 10-pin WSON package (3mm × 3mm, package code NGY0010A/DSC0010A), with exposed die-attach pad (DAP) for improved heat dissipation and ground connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | VOUT | Regulated output voltage node; must be connected externally with low-inductance path to COUT |
| 3 | FB | Feedback input for adjustable output; connects to resistor divider midpoint; 1nA input bias enables high-impedance setting |
| 4 | SD | Active-low shutdown control; internally pulled to GND via 200kΩ; logic-low (≤0.4V) disables regulator |
| 5, 6, DAP | GND | System ground reference; DAP must be soldered to large copper pour with multiple thermal vias for thermal management |
| 7 | CAP− | Negative terminal of external flying capacitor (CFLY); critical for charge-transfer phase integrity |
| 8, 9 | VIN | Input supply node; dual pins reduce trace inductance and IR drop; requires local 2.2µF CIN |
| 10 | CAP+ | Positive terminal of external flying capacitor (CFLY); paired with CAP− to form charge-pump path |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless architecture | Eliminates magnetic components and EMI concerns; uses only three small MLCCs (CIN/COUT/CFLY) |
| Tightly controlled soft-start | 0.5ms (typ.) VOUT ramp time prevents inrush current and system brownout during enable |
| Pre-regulation topology | Minimizes input current ripple, keeping VIN line virtually noise-free for sensitive analog/RF circuits |
| Integrated protection | Current limit (300mA typ.) and thermal shutdown (150°C trip) safeguard IC and load under fault conditions |
| Low-noise regulated output | 4mVp-p ripple with 10µF COUT enables direct powering of audio amplifiers and precision analog stages |
| WSON thermal performance | θJA = 55°C/W enables full 120mA output without derating in properly laid-out 4-layer PCBs |
Applications
| White LED Backlighting | Cellular Phone SIM Card Power |
|---|---|
|
Use Scenario: Driving parallel white LEDs in compact handheld displays requiring stable 4.5–5.0V bias. IC Role / Device Role / Timing Role: Adjustable boost regulator supplying regulated VOUT set to 4.8V via R1/R2, replacing inductive solutions to avoid EMI near RF sections. Use Value: 1.7MHz operation allows 1µF CFLY and 2.2µF COUT, reducing board area by >40% vs. inductor-based alternatives while maintaining <15mVp-p ripple. |
Use Scenario: Providing isolated, low-noise 5V supply to SIM card interface circuitry in multi-voltage mobile platforms. IC Role / Device Role / Timing Role: Low-quiescent, shutdown-capable regulator delivering clean 5.0V from shared Li-ion rail, activated only during SIM communication bursts. Use Value: Shutdown current <2µA extends standby battery life; pre-regulation prevents SIM data corruption caused by VIN ripple coupling into digital I/O lines. |
| Audio Amplifier Bias Supply | Li-ion to 5V General-Purpose Conversion |
|
Use Scenario: Generating low-ripple bias voltage for Class AB headphone amplifiers in portable audio devices. IC Role / Device Role / Timing Role: Regulated switched-capacitor source delivering 5.0V ±4% with 4mVp-p ripple, decoupled from noisy digital supply domains. Use Value: Eliminates audible switching noise in audio path; 120mA capability supports dual-channel amplifiers without thermal throttling in WSON package. |
Use Scenario: Converting single-cell Li-ion (2.7–4.2V) to stable 5V for USB-peripheral charging or MCU peripherals in wearables. IC Role / Device Role / Timing Role: Compact, cost-optimized DC-DC solution requiring no magnetics, supporting dynamic load steps up to 100mA. Use Value: 85% peak efficiency at 2.9V input preserves battery runtime; adjustable output allows future-proofing for 4.5V or 4.8V system rails. |
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 |
|---|---|---|---|
| LM2750LDX-5.0 | Fixed 5.0V output; FB pin replaced with GND; identical package, pinout, and efficiency | No external resistors needed; unsuitable for non-5V rails; lacks flexibility for margin testing or voltage scaling | Select when system requires only 5.0V and board space for feedback resistors is constrained |
| TPS60403DBVR | Fixed 5.0V output; 600kHz switching; max 60mA IOUT; SOT-23-5 package; no shutdown pin | Lower output current and efficiency (80% peak); smaller footprint but higher thermal resistance (θJA ≈ 200°C/W) | Choose only for ultra-low-cost, low-current (<40mA), non-shutdown applications where WSON thermal performance is not required |
Compared with LM2750LDX-ADJ, LM2750LDX-5.0 removes design flexibility but simplifies BOM, while TPS60403DBVR trades current capability, thermal robustness, and feature set for package size and cost-neither offers pin compatibility or identical regulation behavior.
Availability
LM2750LDX-ADJ is available at Aetrix Electronics and suitable for white LED backlighting, cellular SIM card power, audio amplifier bias supplies, and general-purpose Li-ion-to-5V conversion requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2750LDX-ADJ 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 space-constrained, noise-sensitive, battery-operated applications requiring inductorless, low-EMI power conversion-targeting mobile handsets, portable audio, and compact IoT endpoints.
FAQ
What is the recommended external capacitor configuration for LM2750LDX-ADJ?
The LM2750LDX-ADJ requires three external MLCCs: 2.2µF input capacitor (CIN) placed adjacent to pins 8/9, 2.2µF output capacitor (COUT) near pins 1/2, and 1µF flying capacitor (CFLY) between pins 7 (CAP−) and 10 (CAP+). TDK C2012X7R1A225K (2.2µF) and C1608X5R1A105K (1µF) are validated part numbers. Ceramic X7R/X5R dielectrics are mandatory; tantalum or electrolytic capacitors are prohibited due to high ESR.
How is the output voltage programmed on LM2750LDX-ADJ?
The LM2750LDX-ADJ output voltage is set using an external resistor divider connected to the FB pin (pin 3). The formula is VOUT = 1.23V × (1 + R1/R2), with R1 connected between VOUT and FB, and R2 between FB and GND. Total resistance (R1 + R2) must be 15kΩ–20kΩ; for VOUT = 4.8V, typical values are R1 = 14.7kΩ and R2 = 4.99kΩ. A 10pF capacitor across R1 is recommended if total resistance exceeds 20kΩ.
Does LM2750LDX-ADJ support shutdown functionality, and how is it implemented?
Yes, LM2750LDX-ADJ supports active-low shutdown via pin 4 (SD). Pulling SD to GND (≤0.4V) disables regulation and reduces supply current to <2µA. An internal 200kΩ pull-down resistor ensures automatic shutdown when SD is left floating. To enable, drive SD to VIN or logic-high (≥1.3V). No external pull-up is required, but driving capability must exceed 5µA to overcome the internal pull-down.
What thermal management practices are required for LM2750LDX-ADJ at full 120mA load?
At 120mA output, LM2750LDX-ADJ requires proper thermal design: the DAP (die-attach pad) must be soldered to a minimum 100mm² copper pour with ≥4 thermal vias (0.3mm diameter) connecting to inner ground planes. Use of 4-layer PCB with 1oz copper on all layers and 55°C/W θJA layout is mandatory. Ambient temperature must not exceed 85°C; junction temperature must stay below 125°C under continuous load, verified via thermal simulation or IR measurement.
Can LM2750LDX-ADJ operate with input voltage below 2.7V?
No, LM2750LDX-ADJ is not specified or guaranteed to operate below 2.7V. Absolute minimum VIN is −0.3V (damage threshold), but functional operation begins at 2.7V per Operating Ratings. At 2.7V–2.9V input, maximum output current is limited to 40mA; attempting higher loads risks output droop, thermal shutdown, or regulation loss. For sub-2.7V operation, alternative regulators such as the TPS60400 series must be evaluated.
LM2750LDX-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
LM2750LDX-ADJ FAQ
1.How can I place an order for LM2750LDX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2750LDX-ADJ 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 LM2750LDX-ADJ reliable?
The price and inventory of LM2750LDX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2750LDX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2750LDX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2750LDX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2750LDX-ADJ?
LM2750LDX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2750LDX-ADJ 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 LM2750LDX-ADJ?
For technical support, including LM2750LDX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2750LDX-ADJ requirements.
6.How does Aetrix verify that LM2750LDX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2750LDX-ADJ 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 LM2750LDX-ADJ meets industry standards.
7.What is the process for return or replacement of LM2750LDX-ADJ?
All LM2750LDX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2750LDX-ADJ, 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 LM2750LDX-ADJ part is unused and in its original packaging.
Return procedure for LM2750LDX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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