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Texas Instruments LM2792LDX-L/NOPB
- Part No.:
- LM2792LDX-L/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2792LDX-L/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 34MA 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,247
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Product details
Overview
LM2792LDX-L/NOPB from Texas Instruments is a CMOS charge-pump LED driver IC delivering two matched, analog-brightness-controlled current sources for white/blue LED backlighting. It operates from 3.0V to 5.8V input, delivers up to 34mA total (±0.3% matching), and integrates soft-start, 900kHz min switching frequency, and 1µA shutdown current - used in handheld display backlight systems.
For engineers reviewing the LM2792LDX-L/NOPB datasheet, LM2792LDX-L/NOPB pinout, LM2792LDX-L/NOPB application, or LM2792LDX-L/NOPB equivalent, key selection criteria include analog brightness control linearity (0–3V BRGT range), WSON-10 thermal performance (θJA = 55°C/W), dual-current-source matching tolerance, and absence of inductor requirement in compact portable designs.
Technical Context
The LM2792LDX-L/NOPB implements a voltage-doubling switched-capacitor charge pump with internal 25:1 current mirror architecture to regulate two independent LED currents without external series resistors. Its analog brightness control uses a 0–3V BRGT input that scales output current linearly via an internal 0.42× voltage divider feeding the mirror reference.
It features active-high shutdown (SD pin), integrated soft-start limiting inrush during capacitor charging, and thermal protection disabling the charge pump above 150°C junction temperature. The device maintains stable operation across −30°C to +85°C ambient with ≤1.4mA quiescent current and 900–1800kHz switching frequency depending on VIN and load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 5.8V - supports single-cell Li-ion battery operation without external regulation. |
| Max Total Output Current | 34mA - drives two white LEDs at up to 17mA each, or one LED at 34mA when D1/D2 are paralleled. |
| Current Matching Accuracy | ±0.3% (typ.) - ensures balanced luminance between dual LEDs in display backlight applications. |
| Switching Frequency | 900kHz (min.) - places noise spectrum above sensitive RF bands in portable devices. |
| Shutdown Current | 1µA (max.) - enables ultra-low-power standby in battery-critical systems. |
| Brightness Control Range | 0V to 3.0V on BRGT pin - provides full analog dimming from off to maximum set current. |
| Quiescent Current | 1.4mA (typ.) - minimizes battery drain during active backlight operation. |
Pinout & Package
LM2792LDX-L/NOPB is housed in a thermally enhanced 10-pin WSON package (3mm × 3mm × 0.8mm) with exposed die attach pad (2.0mm × 1.2mm) for PCB thermal land connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BRGT | Analog brightness control input | Voltage (0–3V) directly sets LED current magnitude; internal 250kΩ input resistance and 0.42× scaling determine ISET. |
| 2 - POUT | Charge pump output node | Provides doubled voltage rail; requires external Schottky diode (e.g., BAT54) between VIN and POUT for startup. |
| 3 - C1− | Flying capacitor negative terminal | Connects to negative side of 1µF ceramic flying capacitor (C1); low-ESR X5R/X7R recommended. |
| 4 - C1+ | Flying capacitor positive terminal | Connects to positive side of C1; forms charge-transfer path for voltage doubling. |
| 5 - D2 | LED current source output #2 | Direct connection to cathode/anode of second LED; matched to D1 within ±0.3%. |
| 6 - D1 | LED current source output #1 | Direct connection to cathode/anode of first LED; identical regulation and compliance as D2. |
| 7 - GND | Power ground reference | Primary return path for all internal circuits and external capacitors; must be low-impedance PCB plane. |
| 8 - VIN | Main power supply input | Accepts 3.0–5.8V; powers charge pump, regulators, and logic; requires 1µF low-ESR ceramic bypass (CIN). |
| 9 - SD/SD | Active-high shutdown control | Logic high (≥0.8×VIN) disables device; reduces supply current to ≤1µA; "-L" suffix denotes active-high polarity. |
| 10 - ISET | Current sense reference node | Connects external RSET resistor to GND; sets full-scale current via 25:1 mirror ratio (ILED = 25 × VBRGT×0.42/RSET). |
Key Features
| Feature | Design Value |
|---|---|
| Matched dual current sources | ±0.3% matching ensures uniform luminance across dual-LED displays without binning or trimming. |
| Analog brightness control | Linear 0–3V BRGT input enables flicker-free dimming without PWM circuitry or EMI concerns. |
| Inductorless charge-pump topology | Eliminates magnetic components, reducing BOM count, board area, and EMI emissions in space-constrained designs. |
| Soft-start function | Internally ramps bandgap reference to limit inrush current during startup, protecting flying/hold capacitors. |
| Thermal shutdown protection | Disables charge pump at TJ > 150°C and recovers automatically below 100°C, preventing permanent damage. |
Applications
| White LED Display Backlights | White LED Keypad Backlights |
|---|---|
Use Scenario: Driving dual white LEDs behind small-format LCD panels in PDAs and handheld PCs. IC Role / Device Role / Timing Role: Provides matched constant-current sources with analog dimming to maintain consistent color and brightness across display area. Use Value: Eliminates need for discrete current-setting resistors and enables smooth brightness control using only a DAC or potentiometer on BRGT. |
Use Scenario: Illuminating alphanumeric keypads in cellular phones and industrial handheld terminals. IC Role / Device Role / Timing Role: Delivers regulated current to two low-profile SMD LEDs while operating from a single Li-ion cell. Use Value: Ensures uniform keypad illumination intensity across varying battery voltage (3.0–4.2V) without brightness drift. |
| 1-Cell Li-Ion Portable Devices | Flat Panel Display Modules |
Use Scenario: Powering backlight in compact consumer electronics including MP3 players and digital cameras. IC Role / Device Role / Timing Role: Functions as a self-contained, inductorless LED driver with integrated voltage doubling and thermal protection. Use Value: Reduces solution size by >40% vs. inductive boost solutions and avoids EMI filtering requirements. |
Use Scenario: Supporting edge-lit or direct-lit mini-backlight modules in industrial HMIs and medical displays. IC Role / Device Role / Timing Role: Supplies tightly matched current to multiple LED strings via parallel D1/D2 configuration. Use Value: Enables 34mA single-LED drive capability with same accuracy and thermal behavior as dual-LED mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2792LDX-H/NOPB | Same silicon, active-low shutdown polarity (SD pin asserted low to disable) | Requires inverted logic signal or level-shifting circuitry if replacing -L version | Select -H only when system-level control logic is active-low and layout allows pin-compatible substitution. |
| TPS61160DRVR | Inductor-based boost converter; higher efficiency at >4.2V VIN but larger footprint and EMI sensitivity | Supports wider LED VF range (up to 24V) and higher current (40mA), but lacks analog dimming linearity | Choose TPS61160DRVR only when driving >4V LEDs or requiring >34mA per string; not drop-in compatible. |
Compared with LM2792LDX-L/NOPB, the -H variant offers identical electrical performance but reversed shutdown logic, while TPS61160DRVR trades capacitor-based simplicity for higher-voltage flexibility and inductor-dependent layout constraints - neither is pin-compatible, and both require schematic and firmware review before substitution.
Availability
LM2792LDX-L/NOPB is available at Aetrix Electronics and suitable for white LED display backlights, keypad illumination, and 1-cell Li-ion portable devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2792LDX-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 leader specializing in analog, embedded processing, and power management technologies, with over 90 years of innovation in high-reliability electronic components.
The LM2792 product line was designed specifically for compact, inductorless white LED backlighting in battery-powered portable electronics - prioritizing current matching accuracy, analog dimming fidelity, and thermal robustness in CSP packages.
FAQ
What is the shutdown polarity of LM2792LDX-L/NOPB?
The LM2792LDX-L/NOPB features active-high shutdown: asserting the SD pin to ≥0.8×VIN disables the device and reduces supply current to ≤1µA. This differs from the -H variant, which requires SD ≤0.2×VIN to disable. Confirm logic level compatibility with host controller before integration.
How is LED current set on LM2792LDX-L/NOPB?
LED current on LM2792LDX-L/NOPB is set by two factors: an external RSET resistor connected from ISET to GND determines full-scale current, and the BRGT pin voltage (0–3V) scales that current linearly. For example, with RSET = 1.8kΩ and BRGT = 2.75V, each LED draws ~16mA.
Can LM2792LDX-L/NOPB drive a single LED at higher current?
Yes - LM2792LDX-L/NOPB supports parallel connection of D1 and D2 outputs to drive one LED at up to 34mA. RSET and BRGT must be selected so each current source delivers half the target current (e.g., 15mA per source for 30mA total), preserving matching and thermal limits.
What capacitor types are required for LM2792LDX-L/NOPB?
LM2792LDX-L/NOPB requires three 1µF ceramic capacitors: CIN (input bypass), C1 (flying capacitor), and CHOLD (output hold capacitor), all with ≤0.3Ω ESR. X5R or X7R dielectrics from Murata, TDK, or Taiyo Yuden are explicitly recommended in the datasheet for stable regulation and efficiency.
Does LM2792LDX-L/NOPB include thermal protection?
Yes - LM2792LDX-L/NOPB incorporates internal thermal shutdown that disables the charge pump when junction temperature exceeds 150°C. Operation resumes automatically once TJ falls below 100°C. Proper PCB thermal land design (1:1 copper pad with vias to ground plane) is essential to maintain this protection margin.
LM2792LDX-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)
LM2792LDX-L/NOPB FAQ
1.How can I place an order for LM2792LDX-L/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2792LDX-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 LM2792LDX-L/NOPB reliable?
The price and inventory of LM2792LDX-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 LM2792LDX-L/NOPB is usually 5 days.
3.What payment methods are accepted for LM2792LDX-L/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2792LDX-L/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2792LDX-L/NOPB?
LM2792LDX-L/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2792LDX-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 LM2792LDX-L/NOPB?
For technical support, including LM2792LDX-L/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2792LDX-L/NOPB requirements.
6.How does Aetrix verify that LM2792LDX-L/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2792LDX-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 LM2792LDX-L/NOPB meets industry standards.
7.What is the process for return or replacement of LM2792LDX-L/NOPB?
All LM2792LDX-L/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2792LDX-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 LM2792LDX-L/NOPB part is unused and in its original packaging.
Return procedure for LM2792LDX-L/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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