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Texas Instruments LM2750SD-ADJ
- Part No.:
- LM2750SD-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2750SD-ADJ.pdf
- Description:
- IC REG CHARGE PUMP ADJ 1 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,946
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Product details
Overview
LM2750SD-ADJ from Texas Instruments is a regulated switched-capacitor boost regulator in a 10-pin WSON package, delivering adjustable 3.8V–5.2V output with up to 120mA load current at VIN ≥ 2.9V and fixed 1.7MHz switching frequency. It uses only three external ceramic capacitors (CIN, COUT, CFLY), achieves ≤4mVp-p output ripple at 100mA, and features pre-regulation for near-noise-free input line operation - ideal for Li-ion–powered audio amplifiers and LED display bias supplies.
For engineers reviewing the LM2750SD-ADJ datasheet, LM2750SD-ADJ pinout, LM2750SD-ADJ application, or LM2750SD-ADJ equivalent, this page delivers verified technical context, exact pin-to-function mapping, real-world efficiency curves, feedback resistor design guidance for VOUT programming, and validated alternative options for low-noise, inductorless 5V conversion.
Technical Context
The LM2750SD-ADJ implements a two-phase non-overlapping switched-capacitor doubler architecture with internal pre-regulation: input-connected pass-transistor switches modulate on-resistance before voltage doubling to maintain tight output regulation. Its feedback pin (FB, Pin 3) senses output via external resistor divider (R1/R2), enabling precise VOUT = 1.23V × (1 + R1/R2) across 3.8V–5.2V range.
Thermal protection engages at TJ = 150°C (typ.) with hysteresis release at 130°C, and shutdown draws <2µA. Input current ripple is minimized by pre-regulation, while soft-start limits turn-on inrush to 0.5ms (typ.), and overcurrent protection clamps IOUT at 300mA (typ.) during short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Adjustable 3.8V–5.2V; set by external R1/R2 divider; 1.23V FB reference enables precise regulation without trimming. |
| Input Voltage Range | 2.7V–5.6V; supports full Li-ion discharge curve (2.7V–4.2V) with stable output current capability. |
| Output Current | Up to 120mA at VIN ≥ 2.9V; up to 40mA at VIN = 2.7V; sufficient for white LED bias or audio amplifier rails. |
| Switching Frequency | Fixed 1.7MHz; enables use of small 1µF flying capacitor and minimizes EMI in space-constrained layouts. |
| Output Ripple | ≤4mVp-p at 100mA with 10µF COUT; ≤15mVp-p with 2.2µF COUT - critical for noise-sensitive analog circuits. |
| Efficiency | 85% peak at VIN=2.9V/IOUT=120mA; 70% average over 2.9V–4.2V Li-ion range - extends battery runtime. |
| Shutdown Current | <2µA; enables ultra-low-power sleep modes in portable devices without compromising wake-up latency. |
Pinout & Package
LM2750SD-ADJ is housed in a thermally enhanced 10-pin WSON package (3mm × 3mm, NGY0010A/DSC0010A), featuring an exposed die-attach pad (DAP) for low-θJA (55°C/W) and robust thermal performance without derating under full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | VOUT | Regulated output voltage node; dual pins reduce IR drop and improve current sharing for 120mA loads. |
| 3 | FB | Feedback input for adjustable output; connects to R1/R2 divider junction; 1.232V (typ.) reference enables accurate VOUT programming. |
| 4 | SD | Active-low shutdown control; internal 200kΩ pull-down ensures safe default-off state; logic-compatible with 0.4V/1.3V thresholds. |
| 5, 6, DAP | GND | Power and signal ground; DAP must be soldered to PCB ground plane for thermal and EMI performance. |
| 7 | CAP− | Flying capacitor negative terminal; connects to CFLY (1µF); low-inductance routing essential for stable charge transfer. |
| 8, 9 | VIN | Input supply node; dual pins minimize trace resistance and inductance; requires local 2.2µF CIN placed adjacent to pins. |
| 10 | CAP+ | Flying capacitor positive terminal; completes charge-pump path; paired with CAP− for efficient voltage doubling. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless architecture | Eliminates magnetic components and associated EMI; reduces BOM count to just 3 MLCCs (CIN/COUT/CFLY). |
| Tightly controlled soft-start | 0.5ms (typ.) VOUT ramp prevents inrush into downstream capacitance - avoids brownout in shared-rail systems. |
| Pre-regulation topology | Minimizes input current ripple; keeps VIN line virtually noise-free - critical for RF or precision analog subsystems. |
| Integrated thermal shutdown | Auto-recovers at 130°C after shutdown at 150°C; protects against sustained overload without external circuitry. |
| Low-noise output | ≤4mVp-p ripple at 100mA enables direct powering of op-amps, ADC references, and Class AB audio stages. |
Applications
| White LED Display Backlight | Cellular Phone SIM Card Power |
|---|---|
Use Scenario: Driving 3–5 white LEDs in series from a single Li-ion cell (2.7V–4.2V) in compact handheld displays. IC Role / Device Role / Timing Role: Boost regulator providing stable 5.0V rail; operates at fixed 1.7MHz to avoid audible noise and simplify filtering. Use Value: Delivers 120mA at >85% peak efficiency with <4mVp-p ripple - eliminates visible LED flicker and preserves color accuracy. | Use Scenario: Supplying clean 3.8V–5.2V power to ISO 7816-compliant SIM cards in smartphones and wearables. IC Role / Device Role / Timing Role: Adjustable voltage source with shutdown control; FB pin enables precise compliance with SIM card VCC specs. Use Value: <2µA shutdown current extends standby time; pre-regulation prevents noise coupling into secure element communication lines. |
| Audio Amplifier Bias Rail | Li-ion to 5V General-Purpose Conversion |
Use Scenario: Generating low-noise 5V supply for headphone amplifiers or Class D speaker drivers in portable audio devices. IC Role / Device Role / Timing Role: Low-ripple DC-DC converter; 1.7MHz switching avoids interference in 20Hz–20kHz audio band. Use Value: ≤4mVp-p output ripple prevents audible hiss; WSON thermal design sustains 120mA continuously without derating. | Use Scenario: Replacing linear regulators in legacy 5V systems powered by Li-ion batteries where space and efficiency are constrained. IC Role / Device Role / Timing Role: Inductorless step-up converter; replaces inefficient LDOs with 70% average efficiency over full battery range. Use Value: Reduces heat generation by >60% vs. LDO; 3-capacitor solution saves >40mm² PCB area versus inductor-based alternatives. |
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 |
|---|---|---|---|
| LM2750SD-5.0 | Fixed 5.0V output; identical pinout, package, and efficiency; no FB pin or external resistors required. | Suitable when exact 5.0V ±4% is acceptable; eliminates R1/R2 layout and tolerance sensitivity. | Select LM2750SD-5.0 if system does not require adjustable output - simplifies design and reduces component count. |
| TPS60403DBVR | Fixed 5.0V output; 600kHz switching; lower max IOUT (60mA); requires same 3-capacitor configuration. | Better suited for ultra-low-power microcontroller peripherals; insufficient for 120mA LED or audio loads. | Choose TPS60403DBVR only for sub-60mA applications where lower switching frequency eases EMI filtering. |
Compared with LM2750SD-5.0, the LM2750SD-ADJ trades fixed-output simplicity for programmability across 3.8V–5.2V - essential for SIM card voltage compliance or variable LED forward voltage stacks. Versus TPS60403DBVR, it delivers double the output current and higher efficiency at 1.7MHz, but demands tighter layout attention for low-noise performance.
Availability
LM2750SD-ADJ is available at Aetrix Electronics and suitable for white LED backlighting, cellular SIM card power, audio amplifier bias rails, and general-purpose Li-ion–to–5V conversion requiring stable component supply across production lifecycles.
Supply support for LM2750SD-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 high-reliability power management solutions.
The LM2750 product line delivers low-noise, inductorless voltage boosting for space- and noise-constrained battery-powered systems - targeting portable displays, secure communications, and audio subsystems.
FAQ
What is the recommended feedback resistor network for setting LM2750SD-ADJ to 4.5V output?
To configure LM2750SD-ADJ for 4.5V output, use the equation VOUT = 1.23V × (1 + R1/R2). Solving yields R1/R2 ≈ 2.66. Select R2 = 10kΩ and R1 = 26.7kΩ (standard 1% value), ensuring total resistance (R1 + R2 = 36.7kΩ) remains within the 15kΩ–20kΩ recommendation by adding a 10pF capacitor across R1. This maintains loop stability and achieves ±1% output accuracy per TI's application guidance for LM2750SD-ADJ.
Can LM2750SD-ADJ operate reliably at 2.7V input while delivering 120mA output current?
No - LM2750SD-ADJ is rated for up to 120mA only when VIN ≥ 2.9V. At VIN = 2.7V, maximum supported output current drops to 40mA per the datasheet's operating ratings. Attempting 120mA at 2.7V will cause output voltage droop beyond ±4% regulation and may trigger thermal shutdown due to excessive power dissipation. For full 120mA capability across the entire Li-ion range, select a part with wider input-current envelope or implement input pre-boost staging.
How does the pre-regulation feature of LM2750SD-ADJ reduce input noise compared to standard charge-pump ICs?
LM2750SD-ADJ applies regulation *before* voltage doubling by modulating the on-resistance of input-connected switches during the charge phase (φ1). This controls input current draw dynamically, eliminating the pulsed, high-amplitude current spikes typical of open-loop charge pumps. As a result, VIN line ripple is reduced to negligible levels - critical for co-located RF transceivers or precision ADCs sharing the same battery rail. Standard charge pumps lack this pre-regulation stage and inject significant broadband noise into the input supply.
What is the minimum flying capacitor value supported for LM2750SD-ADJ at 120mA load?
The minimum recommended flying capacitor (CFLY) for LM2750SD-ADJ at 120mA is 1.0µF, per TI's Electrical Characteristics table. Using <1.0µF risks increased output resistance (ROUT), leading to excessive VOUT droop and potential loss of regulation under load. While the device may function with smaller values in low-current applications, 1.0µF is the validated lower bound for full 120mA operation - and TI specifies 1.0µF TDK C1608X5R1A105K as a qualified part for LM2750SD-ADJ designs.
Does LM2750SD-ADJ require external compensation components for stability?
No - LM2750SD-ADJ is internally compensated and requires no external compensation components. Its regulation loop is optimized for use with standard ceramic capacitors (CIN, COUT, CFLY) in the specified values (1.0µF–2.2µF). Stability is guaranteed across the full operating range (−40°C to 125°C junction temperature) when layout follows TI's recommendations: short, low-inductance traces to all capacitors; solid ground plane connection to DAP and GND pins; and avoidance of vias in high-current paths. Adding external compensation would disrupt factory-tuned loop response.
LM2750SD-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)
LM2750SD-ADJ FAQ
1.How can I place an order for LM2750SD-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2750SD-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 LM2750SD-ADJ reliable?
The price and inventory of LM2750SD-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2750SD-ADJ is usually 5 days.
3.What payment methods are accepted for LM2750SD-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2750SD-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2750SD-ADJ?
LM2750SD-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2750SD-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 LM2750SD-ADJ?
For technical support, including LM2750SD-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2750SD-ADJ requirements.
6.How does Aetrix verify that LM2750SD-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2750SD-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 LM2750SD-ADJ meets industry standards.
7.What is the process for return or replacement of LM2750SD-ADJ?
All LM2750SD-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2750SD-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 LM2750SD-ADJ part is unused and in its original packaging.
Return procedure for LM2750SD-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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