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Texas Instruments LM2792LD-L/NOPB
- Part No.:
- LM2792LD-L/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2792LD-L/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 34MA 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,957
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Product details
Overview
LM2792LD-L/NOPB from Texas Instruments is a current-regulated switched-capacitor white LED driver IC with analog brightness control, delivering up to 34mA total (17mA per channel), ±0.3% output current matching, and 900kHz minimum switching frequency for noise management in portable RF-sensitive devices.
For engineers reviewing the LM2792LD-L/NOPB datasheet, LM2792LD-L/NOPB pinout, LM2792LD-L/NOPB application, or LM2792LD-L/NOPB equivalent, this device supports dual-LED backlighting with linear BRGT-pin-controlled dimming, soft-start inrush limiting, and active-high shutdown - critical for Li-ion-powered handheld displays and keypad illumination.
Technical Context
The LM2792LD-L/NOPB integrates a CMOS charge-pump voltage doubler with two matched 25:1 current mirrors, enabling precise LED current regulation without series resistors. Its internal bandgap reference and operational amplifier control ISET via external RSET and BRGT voltage scaling (0–3V range).
It operates from 3.0V to 5.8V input, delivers regulated current to D1/D2 outputs independent of LED forward voltage variation (up to 4.0V), and uses CHOLD/C1 capacitors to stabilize the doubled POUT rail - all while maintaining predictable linear noise spectrum due to fixed-frequency operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 5.8V - supports single-cell Li-ion battery operation across full discharge curve. |
| Max Total Output Current | 34mA - enables driving two high-VF white LEDs at 17mA each with guaranteed matching. |
| Current Matching Accuracy | ±0.3% (typ.) - ensures balanced luminance in dual-LED display backlights. |
| Switching Frequency | 900kHz (min.) - places noise spectrum above sensitive audio/RF bands in portable systems. |
| Shutdown Current | 1µA (max.) - minimizes battery drain during system sleep modes. |
| Brightness Control Range | 0–3.0V on BRGT pin - provides smooth, linear analog dimming from off to full scale. |
| Operating Junction Temp | −30°C to +100°C - validated for consumer handheld and industrial embedded environments. |
Pinout & Package
LM2792LD-L/NOPB is housed in a 10-pin WSON package (3mm × 3mm × 0.8mm) with exposed thermal pad for enhanced power dissipation in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BRGT | Analog brightness control input | Voltage (0–3V) linearly scales LED current; requires stable low-impedance source. |
| 2 - POUT | Charge-pump output rail | Doubled voltage node supplying D1/D2 current sources; requires CHOLD capacitor. |
| 3 - C1− | Flying capacitor negative terminal | Connects to negative side of C1; forms charge-transfer path in voltage-doubling stage. |
| 4 - C1+ | Flying capacitor positive terminal | Connects to positive side of C1; alternately charges/discharges to generate POUT. |
| 5 - D2 | Current source output 2 | Direct LED anode connection; sinks regulated current set by RSET and BRGT. |
| 6 - D1 | Current source output 1 | Direct LED anode connection; matches D2 current within ±0.3% over temperature. |
| 7 - GND | Power ground reference | Common return for VIN, ISET, SD, and internal regulators; must be low-impedance. |
| 8 - VIN | Main supply input | 3.0–5.8V input powering charge pump and internal circuitry; bypass with CIN. |
| 9 - SD/SD | Active-high shutdown input | Logic-high (≥0.8×VIN) disables device; draws ≤1µA in shutdown state. |
| 10 - ISET | Current sense feedback node | Connects external RSET to GND; sets mirror current ratio (25:1) for LED drive. |
Key Features
| Feature | Design Value |
|---|---|
| Soft-start circuitry | Ramps internal bandgap reference to limit inrush current during power-up, protecting flying capacitors. |
| Linear analog dimming | BRGT pin accepts 0–3V analog signal to proportionally scale LED current without PWM artifacts. |
| No-inductor architecture | Uses switched-capacitor topology - eliminates magnetic EMI and reduces PCB area vs. inductive boost drivers. |
| Matched dual current sources | Internal 25:1 current mirrors ensure <±0.3% matching between D1 and D2 outputs across temperature. |
| Thermal protection | Auto-shutdown at 150°C junction temperature; resumes operation after cooling below 100°C. |
Applications
| White LED Display Backlights | White LED Keypad Backlights |
|---|---|
Use Scenario: Driving dual white LEDs behind small LCD panels in PDAs and handheld PCs. IC Role / Device Role / Timing Role: Regulated current source providing matched, stable illumination independent of LED VF variance. Use Value: Eliminates brightness imbalance and extends battery life via efficient 900kHz charge-pump operation. | Use Scenario: Illuminating alphanumeric keypads in cellular phones and portable medical devices. IC Role / Device Role / Timing Role: Analog-dimmable dual-channel LED driver enabling user-adjustable keypad brightness. Use Value: Delivers flicker-free dimming down to 0% using BRGT voltage control, avoiding PWM-induced EMI. |
| 1-Cell Li-Ion Battery Systems | Flat Panel Displays |
Use Scenario: Powering LED arrays in battery-operated equipment with 3.0–4.2V supply range. IC Role / Device Role / Timing Role: Voltage-doubling LED driver maintaining constant current despite declining battery voltage. Use Value: Sustains consistent LED brightness across full Li-ion discharge cycle without external regulation. | Use Scenario: Backlighting compact monochrome or color STN/TFT displays in industrial HMIs. IC Role / Device Role / Timing Role: Dual-output current regulator supporting parallel LED strings with matched luminance. Use Value: Enables uniform backlighting with minimal component count and no inductor-related layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2792LD-H/NOPB | Active-low shutdown polarity (vs. active-high in LM2792LD-L/NOPB); identical electrical specs and pinout. | Requires inverted logic signal for enable/disable; otherwise interchangeable in dual-LED backlight circuits. | Select based on system-level control signal polarity - no PCB or firmware changes needed beyond logic inversion. |
| TPS61160DRVR | Inductor-based boost converter; higher efficiency at >4.5V input; no BRGT analog dimming (PWM-only). | Supports higher LED string voltages (>5V); less suitable for ultra-low-noise RF environments due to inductor EMI. | Choose when driving >2 LEDs in series or requiring >90% efficiency above 4.5V; not drop-in compatible. |
Compared with LM2792LD-L/NOPB, the LM2792LD-H/NOPB offers identical performance with reversed shutdown logic - ideal for legacy board reuse - while the TPS61160DRVR trades capacitor-based simplicity for higher-voltage capability and inductor-dependent efficiency, requiring layout redesign.
Availability
LM2792LD-L/NOPB is available at Aetrix Electronics and suitable for white LED display backlights, keypad illumination, and 1-cell Li-ion portable electronics requiring stable component supply and long-term design continuity.
Supply support for LM2792LD-L/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies.
The LM2792 product line was designed specifically for compact, low-noise white LED backlighting in battery-powered portable devices - prioritizing current matching, analog dimming fidelity, and capacitor-based simplicity over inductor-dependent architectures.
FAQ
What is the shutdown polarity of the LM2792LD-L/NOPB?
The LM2792LD-L/NOPB features active-high shutdown: asserting SD/SD pin to ≥0.8×VIN disables the device and reduces quiescent current to ≤1µA. This differs from the LM2792LD-H/NOPB variant, which uses active-low logic. The "L" suffix explicitly denotes the active-high configuration, confirmed in TI's SNVS167L datasheet section "SHUTDOWN MODE".
Can the LM2792LD-L/NOPB drive a single LED with higher current?
Yes - the LM2792LD-L/NOPB supports parallel connection of D1 and D2 outputs to drive one LED at up to 34mA. RSET and BRGT must be configured so each channel delivers half the target current (e.g., 17mA per channel for 34mA total). TI confirms this configuration preserves all electrical specifications including current matching and thermal limits, as detailed in the "PARALLEL DX OUTPUTS" section of the datasheet.
What capacitor types are recommended for C1, CIN, and CHOLD in the LM2792LD-L/NOPB circuit?
Texas Instruments specifies X5R or X7R ceramic capacitors with ≤0.3Ω ESR for C1, CIN, and CHOLD in the LM2792LD-L/NOPB application circuit. Low-ESR ceramics minimize output resistance, maintain voltage regulation, and maximize efficiency - critical for the charge-pump topology. TI references Murata, TDK, and Taiyo Yuden as qualified suppliers in Application Information section "CAPACITOR SELECTION".
How does the BRGT pin voltage translate to LED current in the LM2792LD-L/NOPB?
The LM2792LD-L/NOPB converts BRGT voltage (0–3.0V) into LED current via an internal 0.42× scaling factor and 25:1 current mirror. For example, with RSET = 1800Ω and BRGT = 2.75V, ISET = ((2.75 × 0.42) / 1800) × 25 ≈ 16mA per channel. Full-scale BRGT = 3.0V yields maximum current defined by RSET, while BRGT = 0V forces near-zero output - enabling true analog dimming from off to full.
Is the LM2792LD-L/NOPB still in production or obsolete?
The LM2792LD-L/NOPB is marked "OBSOLETE" in TI's official SNVS167L datasheet (April 2013 revision), indicating it is no longer manufactured. However, Aetrix Electronics maintains legacy inventory and provides lifecycle availability coordination, traceable sourcing, and BOM continuity support for existing designs dependent on this part - consistent with TI's standard warranty terms for production data at time of last shipment.
LM2792LD-L/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.8V
- Voltage - Output:
- -
- Current - Output / Channel:
- 34mA
- Frequency:
- 1.1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
LM2792LD-L/NOPB FAQ
1.How can I place an order for LM2792LD-L/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2792LD-L/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 LM2792LD-L/NOPB reliable?
The price and inventory of LM2792LD-L/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2792LD-L/NOPB is usually 5 days.
3.What payment methods are accepted for LM2792LD-L/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2792LD-L/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2792LD-L/NOPB?
LM2792LD-L/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2792LD-L/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 LM2792LD-L/NOPB?
For technical support, including LM2792LD-L/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2792LD-L/NOPB requirements.
6.How does Aetrix verify that LM2792LD-L/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2792LD-L/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 LM2792LD-L/NOPB meets industry standards.
7.What is the process for return or replacement of LM2792LD-L/NOPB?
All LM2792LD-L/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2792LD-L/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 LM2792LD-L/NOPB part is unused and in its original packaging.
Return procedure for LM2792LD-L/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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