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Texas Instruments LM2792LD-H/NOPB
- Part No.:
- LM2792LD-H/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2792LD-H/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 34MA 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,538
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Product details
Overview
LM2792LD-H/NOPB from Texas Instruments is a current-regulated switched-capacitor white LED driver IC with analog brightness control, delivering matched ±0.3% dual 16.8 mA (typ.) current sources at 3.0–5.8 V input, designed for Li-ion-powered display backlights in handheld devices.
For engineers reviewing the LM2792LD-H/NOPB datasheet, LM2792LD-H/NOPB pinout, LM2792LD-H/NOPB application, or LM2792LD-H/NOPB equivalent, key selection factors include its WSON-10 package, 900 kHz min. switching frequency, 1.4 mA typical operating current, and BRGT-pin-based linear analog dimming - all critical for low-noise, space-constrained backlight designs.
Technical Context
The LM2792LD-H/NOPB integrates a CMOS charge-pump voltage doubler with two precision current mirrors (25:1 ratio) to regulate LED current without external sense resistors in the LED path. It uses an internal bandgap reference and operational amplifier to translate BRGT pin voltage (0–3.0 V) into proportional output current.
Its shutdown input (SD) supports active-low logic enabling, reducing supply current to ≤1 µA; soft-start limits inrush during capacitor charging; and thermal protection disables the charge pump above 150°C junction temperature while maintaining operation down to −30°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 5.8 V - supports single-cell Li-ion battery operation across full discharge curve. |
| Max Output Current per Channel | 34 mA total (17 mA per channel max) - drives two high-VF white LEDs (≥3.0 V) simultaneously. |
| Current Matching Accuracy | ±0.3% (typ.) - ensures balanced luminance in dual-LED backlight arrays without binning. |
| Switching Frequency | 900–1800 kHz - places noise spectrum above sensitive RF bands in portable devices. |
| Brightness Control Range | 0–3.0 V on BRGT pin - enables smooth, linear analog dimming from fully off to full scale. |
| Quiescent Current | 1.4 mA (typ.) - minimizes standby power draw in always-on display systems. |
| Shutdown Current | 1 µA (max.) - meets ultra-low-power requirements for system-level sleep modes. |
Pinout & Package
LM2792LD-H/NOPB is housed in a thermally enhanced 10-pin WSON package (3 mm × 3 mm × 0.8 mm) with exposed die attach pad (DAP) for PCB thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BRGT | Analog brightness control input | Voltage (0–3.0 V) directly sets LED current magnitude via internal resistor divider and op-amp; no external DAC required. |
| 2 - POUT | Charge-pump output node | Provides doubled voltage rail (~2×VIN) to bias LEDs; requires external Schottky diode (e.g., BAT54) between VIN and POUT. |
| 3 - C1− | Flying capacitor negative terminal | Connects to negative side of 1 µF ceramic flying capacitor (C1); forms charge-transfer path for voltage doubling. |
| 4 - C1+ | Flying capacitor positive terminal | Connects to positive side of C1; alternately charges/discharges to generate boosted voltage. |
| 5 - D2 | Current source output 2 | Direct LED anode connection; delivers regulated current (up to 16.8 mA) with ±0.3% matching to D1. |
| 6 - D1 | Current source output 1 | Direct LED anode connection; identical regulation and matching performance as D2. |
| 7 - GND | Power ground reference | Common return for VIN, ISET, SD, and internal regulators; must be low-impedance PCB plane. |
| 8 - VIN | Main power input | Accepts 3.0–5.8 V; powers internal circuitry and charge pump; requires 1 µF low-ESR ceramic bypass (CIN). |
| 9 - SD/SD | Active-low shutdown input | Pulling low disables charge pump and reduces supply current to ≤1 µA; high-impedance when not asserted. |
| 10 - ISET | Current sense reference node | Connects external RSET resistor to GND; sets full-scale LED current via 25:1 current mirror ratio. |
Key Features
| Feature | Design Value |
|---|---|
| Matched dual current sources | ±0.3% matching ensures uniform brightness across dual-LED backlights without optical compensation. |
| Analog brightness control | Linear 0–3.0 V BRGT input eliminates need for PWM generation circuitry or microcontroller GPIO resources. |
| No inductor required | Switched-capacitor architecture enables ultra-compact layout with only three 1 µF ceramic capacitors and one Schottky diode. |
| Soft-start function | Internally ramps bandgap reference to limit inrush current during startup, preventing voltage droop on shared battery rails. |
| Thermal shutdown protection | Auto-disables charge pump above 150°C junction temperature and recovers autonomously below 100°C. |
Applications
| Smartphone Display Backlight | PDA Keypad Illumination |
|---|---|
|
Use Scenario: Driving two white LEDs behind a small TFT-LCD panel in a battery-powered smartphone. IC Role / Device Role / Timing Role: Dual-channel constant-current LED driver with analog dimming interface and integrated charge-pump voltage doubler. Use Value: Eliminates discrete current-setting resistors and inductors, reducing BOM count by ≥4 components while maintaining ±0.3% current matching for consistent color temperature. |
Use Scenario: Uniform illumination of alphanumeric keypad in a legacy PDA with 3.6 V Li-ion supply. IC Role / Device Role / Timing Role: Low-quiescent-current (1.4 mA) LED driver with active-low shutdown for rapid system-level power gating. Use Value: Enables keypad lighting to be disabled during sleep mode with ≤1 µA leakage, extending battery runtime by >12 hours per charge cycle. |
| Handheld PC Frontlight Module | Industrial HMI Panel Backlight |
|
Use Scenario: Compact frontlight solution for reflective LCD in ruggedized handheld PC operating from 3.0–5.5 V range. IC Role / Device Role / Timing Role: Wide-input-voltage LED driver supporting full Li-ion discharge curve without external LDO or DC/DC pre-regulation. Use Value: Maintains stable LED current across 3.0–5.8 V input, avoiding brightness drift during battery discharge and eliminating need for input voltage monitoring. |
Use Scenario: Reliable backlight for industrial human-machine interface panel requiring extended temperature operation (−30°C to +85°C). IC Role / Device Role / Timing Role: Thermally protected LED driver with junction temperature monitoring and automatic recovery from overtemperature events. Use Value: Prevents permanent LED degradation or display failure in enclosed enclosures by disabling output above 150°C and resuming operation once cooled. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2792LD-L/NOPB | Active-high shutdown (SD) instead of active-low; identical electrical specs, pinout, and package. | Requires inverted logic signal for enable/disable; unsuitable where system-level control uses active-low signals. | Select LM2792LD-L/NOPB only if host MCU GPIO is configured for active-high enable; otherwise LM2792LD-H/NOPB matches standard low-active control architecture. |
| TPS61160DRVR | Boost converter topology (inductor-based), 1.2 MHz fixed frequency, 30 mA max per channel, no analog BRGT input. | Requires external inductor and feedback resistors; brightness controlled only via PWM or I²C; higher EMI risk near RF sections. | Choose TPS61160DRVR only when higher output voltage (>2×VIN) or programmable I²C dimming is required; LM2792LD-H/NOPB offers lower component count and analog simplicity. |
Compared with LM2792LD-L/NOPB, LM2792LD-H/NOPB provides native compatibility with standard active-low enable logic, avoiding level-shifting; versus TPS61160DRVR, it eliminates inductor-related size, cost, and EMI concerns while offering direct analog dimming - making it optimal for compact, low-noise, dual-LED backlighting.
Availability
LM2792LD-H/NOPB is available at Aetrix Electronics and suitable for smartphone display backlights, handheld PC frontlights, and industrial HMI panel backlights requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2792LD-H/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 portable power solutions.
The LM2792 product line was engineered specifically for space-constrained, battery-powered LED backlighting in consumer handhelds - prioritizing minimal external components, precise current matching, and analog dimming simplicity.
FAQ
What is the function of the BRGT pin on the LM2792LD-H/NOPB?
The BRGT pin on the LM2792LD-H/NOPB is an analog brightness control input that accepts a 0–3.0 V voltage to linearly set LED current magnitude. Internally, this voltage is scaled by a 0.42 factor and fed to an op-amp controlling the current mirror, enabling smooth, flicker-free dimming without PWM circuitry. The LM2792LD-H/NOPB achieves full-scale current when BRGT = 3.0 V and shuts off output near 0 V.
Does the LM2792LD-H/NOPB require an external Schottky diode, and why?
Yes, the LM2792LD-H/NOPB requires an external Schottky diode (e.g., BAT54 or 1N5817) between VIN and POUT. During startup, this diode provides a low-VF path to charge the output hold capacitor and initiate oscillator operation. Without it, the device may fail to start or latch up due to parasitic conduction paths. The LM2792LD-H/NOPB datasheet specifies ≥200 mA current capability for this diode to ensure reliable turn-on.
Can the D1 and D2 outputs of the LM2792LD-H/NOPB be paralleled to drive a single LED?
Yes, the D1 and D2 outputs of the LM2792LD-H/NOPB can be connected in parallel to drive one LED at up to 34 mA total current. To do so, configure RSET and BRGT such that each channel delivers half the target current (e.g., 15 mA per channel for 30 mA total). The LM2792LD-H/NOPB maintains its ±0.3% matching and all electrical specifications in this configuration, with no impact on efficiency or thermal behavior.
What is the purpose of the ISET pin on the LM2792LD-H/NOPB?
The ISET pin on the LM2792LD-H/NOPB connects to an external resistor (RSET) tied to GND, setting the full-scale LED current via a 25:1 internal current mirror. The current through RSET determines the mirrored current delivered to D1 and D2. For example, with RSET = 1.8 kΩ and BRGT = 2.75 V, the LM2792LD-H/NOPB delivers ~16 mA per channel. This eliminates LED current-setting resistors in the LED path, preserving regulation accuracy.
How does thermal protection operate in the LM2792LD-H/NOPB?
The LM2792LD-H/NOPB includes built-in thermal protection that disables the charge pump when junction temperature exceeds 150°C, preventing damage from sustained overloads or poor PCB thermal design. Operation resumes automatically once the die cools below 100°C. This hysteresis prevents cycling near the trip point. Effective thermal management requires soldering the exposed DAP to a PCB thermal land with vias to inner ground planes - a requirement explicitly defined for the LM2792LD-H/NOPB's WSON-10 package.
LM2792LD-H/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-H/NOPB FAQ
1.How can I place an order for LM2792LD-H/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2792LD-H/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-H/NOPB reliable?
The price and inventory of LM2792LD-H/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-H/NOPB is usually 5 days.
3.What payment methods are accepted for LM2792LD-H/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2792LD-H/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2792LD-H/NOPB?
LM2792LD-H/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2792LD-H/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-H/NOPB?
For technical support, including LM2792LD-H/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2792LD-H/NOPB requirements.
6.How does Aetrix verify that LM2792LD-H/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2792LD-H/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-H/NOPB meets industry standards.
7.What is the process for return or replacement of LM2792LD-H/NOPB?
All LM2792LD-H/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2792LD-H/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-H/NOPB part is unused and in its original packaging.
Return procedure for LM2792LD-H/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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