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Texas Instruments LM2751SD-B/NOPB
- Part No.:
- LM2751SD-B/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2751SD-B/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,525
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Product details
Overview
LM2751SD-B/NOPB from Texas Instruments is a regulated 2×/1.5× switched capacitor white LED driver IC in a 10-pin WSON package, delivering up to 150mA at 4.5V or 80mA at 5.0V with ±3% output regulation, 92% peak efficiency, and programmable switching frequencies (9.5–725kHz). It operates across 2.8V–5.5V input and targets backlighting for small displays and keypads.
For engineers reviewing the LM2751SD-B/NOPB datasheet, LM2751SD-B/NOPB pinout, LM2751SD-B/NOPB application, or LM2751SD-B/NOPB equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative options, and supply-chain support for industrial and embedded lighting designs.
Technical Context
The LM2751SD-B/NOPB implements constant-frequency pre-regulation using dual-gain (2× and 1.5×) charge-pump topology to maintain tight output voltage control without inductors. Gain selection is automatic: 2× below ~3.5V input, 1.5× above ~3.58V, with 40–150mV hysteresis to prevent oscillation during transition.
It features active-high enable (EN) with internal 1MΩ pull-down, two logic-controlled frequency select pins (CS0/CS1), soft-start ramp (300µs typical), and thermal shutdown at 150°C. Output ripple remains under 8mV at 150mA due to double-pumping architecture and fixed-frequency operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.5V or 5.0V option; regulated within ±3% over full input range and load - enables stable LED current without external feedback. |
| Max Output Current | 150mA @ 4.5V / 80mA @ 5.0V - supports 3–6 parallel white LEDs at typical forward voltages. |
| Input Voltage Range | 2.8V to 5.5V - fully covers single-cell Li-ion (2.8V cutoff) through USB 5V rails. |
| Switching Frequency | Programmable: 9.5kHz, 37kHz, 300kHz, or 725kHz - allows trade-off between quiescent current (425µA min) and transient response. |
| Efficiency | Up to 92% @ 5.0V/80mA, 83% @ 4.5V/150mA - exceeds inductor-based boost converters at light-to-moderate loads. |
| Shutdown Current | 0.77µA typical - preserves battery life in always-on portable devices with periodic backlight activation. |
| Package | 10-pin WSON (DSC), 3mm × 3mm × 0.8mm - compact footprint with exposed die-attach pad for thermal management (θJA = 55°C/W). |
Pinout & Package
LM2751SD-B/NOPB uses a 10-pin WSON (DSC0010A) package with exposed thermal pad tied to GND. Pin numbering follows top-view counterclockwise layout starting from top-left corner (Pin 1 = VOUT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VOUT | Regulated output node | Pre-regulated 4.5V/5.0V supply for LED anodes; connects directly to COUT (2.2µF). |
| 2 C1+ | Flying capacitor terminal | Connects to positive side of C1 (1µF); alternates polarity with C1− during charge-pump cycles. |
| 3 VIN | Main power input | Accepts 2.8V–5.5V; requires local 2.2µF ceramic bypass (CIN) near pin. |
| 4 CS0 | Frequency select bit 0 | Active-high logic input; combined with CS1 to set one of four switching frequencies (Table 1). |
| 5 CS1 | Frequency select bit 1 | Active-high logic input; no internal pull-up/down - must be driven externally or hard-wired. |
| 6 EN | Enable control | Active-high enable; internal 1MΩ pull-down ensures safe shutdown on power-up; supports PWM dimming. |
| 7 C2− | Flying capacitor terminal | Connects to negative side of C2 (1µF); complements C2+ in 2×/1.5× charge transfer phases. |
| 8 GND | Power and signal reference | Ground return for all circuitry; die-attach pad must be soldered to PCB ground plane for thermal performance. |
| 9 C1− | Flying capacitor terminal | Connects to negative side of C1 (1µF); works with C1+ to shuttle charge between VIN and VOUT. |
| 10 C2+ | Flying capacitor terminal | Connects to positive side of C2 (1µF); forms second flying capacitor pair for gain flexibility. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates EMI-prone magnetics and reduces BOM cost/size - only four low-ESR ceramic capacitors required. |
| Programmable gain selection | Automatic 2×/1.5× mode switching maximizes efficiency across full input range without user intervention. |
| Low-noise pre-regulation | Fixed-frequency operation minimizes conducted input ripple and simplifies EMI filtering vs. variable-frequency pumps. |
| PWM brightness control | Direct EN-pin PWM dimming enables linear brightness scaling (100Hz–1kHz) without external MOSFET or controller. |
| Robust protection suite | Includes thermal shutdown (150°C), short-circuit current limit (250mA typ.), and <1µA shutdown current. |
Applications
| White LED Display Backlights | White LED Keypad Backlights |
|---|---|
Use Scenario: Driving 3–4 parallel white LEDs in handheld LCD displays (e.g., medical monitors, industrial HMIs). IC Role / Device Role / Timing Role: Regulated 4.5V/5.0V charge-pump voltage source with integrated gain control and soft-start. Use Value: Delivers stable LED current without inductor size penalty; 8mV output ripple prevents visible flicker at full brightness. |
Use Scenario: Illuminating alphanumeric keypads in consumer remotes, POS terminals, and automotive control panels. IC Role / Device Role / Timing Role: Low-quiescent-current (425µA) regulated LED driver with PWM-dimmable enable pin. Use Value: Enables long battery life via ultra-low shutdown current and efficient 9.5kHz/37kHz modes during standby. |
| Portable Medical Device UI Lighting | Industrial Handheld Scanner Backlighting |
Use Scenario: Powering high-CRI white LEDs in battery-operated pulse oximeters and glucose meters. IC Role / Device Role / Timing Role: Input-rail-flexible (2.8V–5.5V) regulated pump supporting Li-ion voltage sag during discharge. Use Value: Maintains ±3% output regulation across full battery range - ensures consistent LED brightness from 4.2V down to 2.8V. |
Use Scenario: Backlighting OLED or TFT displays in rugged barcode scanners used in warehouses and logistics. IC Role / Device Role / Timing Role: Thermally robust (55°C/W θJA) charge-pump driver with exposed-pad thermal path. Use Value: Sustains 150mA output at 4.5V without derating in 60°C ambient environments when PCB thermal vias are implemented. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated switched-capacitor LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2750SD-5.0/NOPB | Fixed 5.0V output only; no 4.5V option; identical pinout and frequency programming. | Lacks dual-voltage flexibility - unsuitable where 4.5V is required for lower-power LED strings. | Select when only 5.0V operation is needed and board layout re-use is critical. |
| TPS60230RTJR | Fixed 5.0V output; 125mA max; 2.5V–5.5V input; different pinout (16-pin QFN); no frequency select pins. | Lower output current and no programmable frequency - limits dimming flexibility and efficiency tuning. | Choose for simpler designs where 125mA suffices and fixed-frequency operation is acceptable. |
Compared with LM2751SD-B/NOPB, LM2750SD-5.0/NOPB offers identical functionality but removes voltage-option flexibility, while TPS60230RTJR trades current capability and programmability for a more integrated, fixed-function solution - making LM2751SD-B/NOPB optimal for designs requiring both 4.5V/5.0V support and dynamic efficiency optimization.
Availability
LM2751SD-B/NOPB is available at Aetrix Electronics and suitable for white LED backlighting, portable medical UIs, and industrial handheld scanner designs requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle continuity.
Supply support for LM2751SD-B/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 precision power conversion and LED driver innovation.
The LM2751 belongs to TI's regulated switched-capacitor LED driver product line, engineered specifically for compact, inductor-free backlight solutions in space-constrained portable and battery-powered systems.
FAQ
What output voltage options does the LM2751SD-B/NOPB support?
The LM2751SD-B/NOPB supports two factory-configured output voltages: 4.5V (Version B) and 5.0V (Version A). The specific variant LM2751SD-B/NOPB is the 4.5V version, delivering tightly regulated output within ±3.5% over 2.8V–5.5V input and up to 150mA load. This version is optimized for lower-forward-voltage LED strings and extended battery runtime.
How does the LM2751SD-B/NOPB achieve high efficiency without an inductor?
The LM2751SD-B/NOPB achieves up to 92% peak efficiency using a dual-gain (2× and 1.5×) switched-capacitor topology that eliminates magnetic components. It dynamically selects gain based on input voltage - operating at 2× when VIN < ~3.5V and 1.5× when VIN > ~3.58V - to keep G × VIN close to VOUT, maximizing energy transfer efficiency while maintaining regulation.
Can the LM2751SD-B/NOPB drive multiple white LEDs in parallel?
Yes, the LM2751SD-B/NOPB can drive multiple white LEDs in parallel when paired with individual current-setting resistors. At 4.5V output and 150mA total current, it supports typical configurations of 3–6 LEDs (VF ≈ 3.0–3.4V), assuming 15–25mA per LED. For uniform brightness, use binned LEDs and ensure PCB layout minimizes trace resistance imbalance.
What is the purpose of the CS0 and CS1 pins on the LM2751SD-B/NOPB?
The CS0 and CS1 pins on the LM2751SD-B/NOPB are active-high logic inputs that configure the device's switching frequency: 9.5kHz (CS0=1, CS1=0), 37kHz (0,0), 300kHz (0,1), or 725kHz (1,1). These selections directly impact quiescent current (425µA–1.5mA) and transient response, enabling optimization for battery life versus dynamic performance in each application.
Does the LM2751SD-B/NOPB include thermal protection?
Yes, the LM2751SD-B/NOPB includes internal thermal shutdown that disables operation when junction temperature exceeds 150°C (typical), re-enabling automatically once temperature falls below 140°C. This protection is critical for sustained 150mA operation in compact layouts; proper thermal design - including soldering the exposed die-attach pad to a PCB ground plane with ≥4 thermal vias - is required to maintain safe TJ.
LM2751SD-B/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.8V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4.5V
- Current - Output / Channel:
- 150mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
LM2751SD-B/NOPB FAQ
1.How can I place an order for LM2751SD-B/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2751SD-B/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 LM2751SD-B/NOPB reliable?
The price and inventory of LM2751SD-B/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2751SD-B/NOPB is usually 5 days.
3.What payment methods are accepted for LM2751SD-B/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2751SD-B/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2751SD-B/NOPB?
LM2751SD-B/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2751SD-B/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 LM2751SD-B/NOPB?
For technical support, including LM2751SD-B/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2751SD-B/NOPB requirements.
6.How does Aetrix verify that LM2751SD-B/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2751SD-B/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 LM2751SD-B/NOPB meets industry standards.
7.What is the process for return or replacement of LM2751SD-B/NOPB?
All LM2751SD-B/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2751SD-B/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 LM2751SD-B/NOPB part is unused and in its original packaging.
Return procedure for LM2751SD-B/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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