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Texas Instruments LM2750SD-ADJ/NOPB
- Part No.:
- LM2750SD-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2750SD-ADJ/NOPB.pdf
- Description:
- IC REG CHARGE PUMP ADJ 1 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
LM2750SD-ADJ/NOPB from Texas Instruments is a regulated switched-capacitor boost regulator delivering adjustable 3.8 V to 5.2 V output voltage with up to 120 mA output current (VIN ≥ 2.9 V), fixed 1.7 MHz switching frequency, and < 4 mVP-P output ripple at 100 mA load. It serves as a low-noise, inductorless power supply for LED drivers and portable audio amplifiers.
For engineers reviewing the LM2750SD-ADJ/NOPB datasheet, LM2750SD-ADJ/NOPB pinout, LM2750SD-ADJ/NOPB application, or LM2750SD-ADJ/NOPB equivalent, key selection criteria include feedback-pin-based output adjustability, pre-regulation architecture minimizing input current ripple, thermal shutdown at 150°C, and WSON-10 package compatibility with high-density PCB layouts.
Technical Context
The LM2750SD-ADJ/NOPB implements pre-regulation by modulating the on-resistance of input-connected pass-transistor switches before charge transfer, reducing input current ripple and preserving battery line integrity. Its two-phase non-overlapping clock controls flying capacitor (CFLY) charging and stacking to achieve voltage doubling.
Output regulation relies on a 1.232 V (typ) internal reference applied to the FB pin, enabling precise external resistor-divider programming (R1/R2 = 15 kΩ–20 kΩ total). Thermal shutdown engages at TJ = 150°C (typ) and releases at 135°C (typ), while overcurrent protection limits output to 300 mA (typ) during short-circuit events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 3.8 V to 5.2 V, set via external R1/R2 divider connected to FB pin |
| Input Voltage Range | 2.7 V to 5.6 V; supports full 120 mA output only when VIN ≥ 2.9 V |
| Switching Frequency | 1.7 MHz (fixed), enabling compact 1 µF CFLY and low-output-ripple design |
| Output Ripple | 4 mVP-P max at 100 mA with 10 µF COUT; 15 mVP-P with 2.2 µF COUT |
| Peak Efficiency | 85% at VIN = 2.9 V, IOUT = 120 mA; 87% at VIN = 2.7 V, IOUT = 40 mA |
| Shutdown Current | < 2 µA, achieved via active-low SD pin with internal 200 kΩ pulldown |
| Feedback Reference | 1.232 V (typ) at FB pin, ±5.3% tolerance over temperature and line |
Pinout & Package
LM2750SD-ADJ/NOPB uses a 3.00 mm × 3.00 mm WSON-10 package with exposed die-attach pad (DAP) for thermal dissipation. The DAP must be soldered to a PCB copper plane for optimal thermal performance (RθJB = 21.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pins 1, 2) | Regulated output voltage terminal | Two parallel pins reduce trace resistance and inductance; require direct connection to COUT |
| VIN (Pins 8, 9) | Input voltage supply terminal | Dual pins minimize input path impedance; must connect externally to CIN with shortest possible traces |
| GND (Pins 5, 6) | Power ground reference | Low-impedance return path; must be tied to DAP and system ground via multiple vias |
| FB (Pin 3) | Feedback input for output voltage regulation | Connects to resistor divider (R1/R2); sets VOUT = 1.23 V × (1 + R1/R2); 1 nA input bias current |
| SD (Pin 4) | Active-low shutdown control | Pulled low internally by 200 kΩ resistor; logic-low ≤ 0.4 V disables regulator and reduces IQ to < 2 µA |
| CAP+ (Pin 10) | Flying capacitor positive terminal | Connects to C+ of 1 µF CFLY; requires minimal trace length and no vias if possible |
| CAP− (Pin 7) | Flying capacitor negative terminal | Connects to C− of 1 µF CFLY; forms charge-transfer path with CAP+ |
| DAP | Thermal and electrical ground | Exposed pad under package body; must be soldered to ≥ 100 mm² copper area for thermal reliability |
Key Features
| Feature | Design Value |
|---|---|
| Pre-regulation architecture | Minimizes input current ripple, keeping VIN line virtually noise-free for sensitive analog circuits |
| Inductorless design | Requires only three ceramic capacitors (CIN, COUT, CFLY); eliminates EMI and size penalties of inductors |
| Tightly controlled soft-start | 500 µs (typ) VOUT ramp time prevents inrush current damage to input source and downstream loads |
| Integrated thermal shutdown | Auto-recovers at 135°C after shutdown at 150°C; enables robust operation without external thermal management |
| Output current limiting | 300 mA (typ) foldback limit protects device and load during shorts or overload conditions |
Applications
| White LED Display Backlighting | Cellular Phone SIM Card Power |
|---|---|
|
Use Scenario: Driving 3–5 white LEDs in series from a single Li-ion cell (2.7–4.2 V). IC Role / Device Role / Timing Role: Boost regulator providing stable 5 V ±4% output with low ripple to ensure uniform LED brightness and flicker-free operation. Use Value: Pre-regulation preserves battery voltage stability, preventing interference with RF transceivers and baseband processors sharing the same power rail. |
Use Scenario: Supplying regulated 3.8–5.2 V to secure microcontroller and EEPROM in UICC/SIM modules. IC Role / Device Role / Timing Role: Adjustable-output switched-capacitor regulator enabling compliance with ISO/IEC 7816-3 voltage classes across varying battery states. Use Value: Shutdown current < 2 µA extends standby battery life; 1.7 MHz switching avoids interference with SIM card clock (1–5 MHz) and data lines. |
| Portable Audio Amplifier Supply | Li-Ion to 5 V General-Purpose Conversion |
|
Use Scenario: Powering Class AB/D headphone amplifiers in Bluetooth earbuds or portable speakers. IC Role / Device Role / Timing Role: Low-noise 5 V supply with < 4 mVP-P ripple ensures high PSRR and low THD+N in audio signal chain. Use Value: Inductorless topology eliminates magnetic coupling into sensitive audio paths; WSON-10 footprint fits tight space constraints. |
Use Scenario: Converting declining Li-ion battery voltage (2.7–4.2 V) to stable 5 V for USB-peripheral emulation or MCU peripherals. IC Role / Device Role / Timing Role: Regulated switched-capacitor doubler maintaining 5 V output across full battery discharge curve without efficiency collapse. Use Value: 70% average efficiency over 2.9–4.2 V input range sustains runtime; thermal shutdown prevents failure during sustained 120 mA loads. |
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 |
|---|---|---|---|
| MAX8647ETE+ | Fixed 5 V output only; no FB pin; 1.2 MHz switching; 100 mA max IOUT | Lacks output adjustability; lower max current restricts use in higher-power LED strings | Select when fixed 5 V and lower cost outweigh need for programmability and 120 mA capability |
| TPS60403DBVR | Fixed 3.3 V output; 600 kHz switching; 60 mA max IOUT; no thermal shutdown | Insufficient output voltage and current for 5 V LED/audio loads; no overtemperature protection | Choose only for low-current 3.3 V bias rails where thermal margin is guaranteed and ripple tolerance is higher |
Compared with MAX8647ETE+ and TPS60403DBVR, LM2750SD-ADJ/NOPB uniquely combines adjustable output (3.8–5.2 V), 120 mA capability, 1.7 MHz low-noise operation, and integrated thermal/current protection-making it the only option suitable for space-constrained, battery-powered 5 V systems requiring both flexibility and robustness.
Availability
LM2750SD-ADJ/NOPB is available at Aetrix Electronics and suitable for white LED display backlighting, cellular phone SIM card power, portable audio amplifier supplies, Li-ion-to-5-V conversion, and industrial handheld radio applications requiring stable component supply and long-term manufacturability.
Supply support for LM2750SD-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The LM2750 product line delivers low-noise, inductorless DC/DC solutions for battery-powered devices where board space, EMI, and input line integrity are critical-targeting displays, wearables, and secure authentication modules.
FAQ
What is the minimum input voltage required for full 120 mA output from the LM2750SD-ADJ/NOPB?
The LM2750SD-ADJ/NOPB delivers up to 120 mA output current only when the input voltage is 2.9 V or higher. Below 2.9 V-down to the absolute minimum of 2.7 V-the maximum supported output current drops to 40 mA. This behavior is defined in the Recommended Operating Conditions table and verified across temperature and load variations per the datasheet's Electrical Characteristics section.
How do I calculate the resistor values needed to set a specific output voltage on the LM2750SD-ADJ/NOPB?
To set the output voltage of the LM2750SD-ADJ/NOPB, use the formula VOUT = 1.23 V × (1 + R1/R2), where R1 connects between VOUT and FB, and R2 connects between FB and GND. The sum R1 + R2 must be between 15 kΩ and 20 kΩ. For example, to achieve 5.0 V output, R1 = 30.7 kΩ and R2 = 10.0 kΩ satisfies both the ratio and total resistance requirement. LM2750SD-ADJ/NOPB's FB pin draws only 1 nA, ensuring minimal error from resistor-divider loading.
Does the LM2750SD-ADJ/NOPB require an external inductor?
No, the LM2750SD-ADJ/NOPB is an inductorless switched-capacitor boost regulator. It uses only three external ceramic capacitors: CIN (1–2 µF), COUT (1–2 µF), and CFLY (1 µF). This eliminates magnetic field emissions, reduces solution size, and simplifies layout-key advantages over inductive boost converters. The LM2750SD-ADJ/NOPB achieves regulation through pre-regulation of internal pass-transistor switches rather than inductor-based energy storage.
What is the purpose of the DAP (die-attach pad) on the LM2750SD-ADJ/NOPB package?
The DAP on the LM2750SD-ADJ/NOPB is an exposed thermal pad on the bottom of the WSON-10 package that functions as both a thermal conduction path and an electrical ground connection. It must be soldered to a dedicated PCB copper area (≥100 mm² recommended) with multiple thermal vias to an internal ground plane. This configuration achieves RθJB = 21.5°C/W, preventing thermal shutdown under full 120 mA load and ensuring reliable long-term operation. LM2750SD-ADJ/NOPB's DAP is electrically tied to GND internally.
Can the LM2750SD-ADJ/NOPB be used for PWM dimming control of LEDs?
Yes, the LM2750SD-ADJ/NOPB supports PWM dimming by applying a pulse-width modulated signal directly to its active-low SD pin. When the SD pin is driven high, the regulator operates normally; when pulled low, it shuts down completely, disconnecting the load. This enables precise brightness control without color shift or audible noise-ideal for white LED backlighting. LM2750SD-ADJ/NOPB's fast turn-on time (0.5 ms typ) ensures responsive dimming transitions without visible flicker at standard PWM frequencies.
LM2750SD-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)
LM2750SD-ADJ/NOPB FAQ
1.How can I place an order for LM2750SD-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2750SD-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 LM2750SD-ADJ/NOPB reliable?
The price and inventory of LM2750SD-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 LM2750SD-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2750SD-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2750SD-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2750SD-ADJ/NOPB?
LM2750SD-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2750SD-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 LM2750SD-ADJ/NOPB?
For technical support, including LM2750SD-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2750SD-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2750SD-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2750SD-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 LM2750SD-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2750SD-ADJ/NOPB?
All LM2750SD-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2750SD-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 LM2750SD-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2750SD-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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