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Texas Instruments LM2794TL
- Part No.:
- LM2794TL
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-WFBGA, DSBGA
- Datasheet:
-
LM2794TL.pdf
- Description:
- IC LED DRV RGLTR PWM 14DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,818
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Product details
Overview
LM2794TL from Texas Instruments is a current-regulated switched-capacitor white LED driver IC with analog and PWM brightness control, delivering up to 20mA per output across four matched current sources (±0.5% matching), operating from 2.7V–5.5V input, and featuring 325kHz minimum switching frequency for low-noise operation in portable Li-ion battery-powered devices such as cellular phone keypads and display backlights.
For engineers reviewing the LM2794TL datasheet, LM2794TL pinout, LM2794TL application, or LM2794TL equivalent, this page provides verified technical context on its 1.5× charge-pump architecture, DSBGA-14 package mapping, BRGT/SD dual-dimming interface, ISET-based current programming, and design-critical headroom voltage constraints for stable LED regulation.
Technical Context
The LM2794TL integrates a fractional CMOS charge pump with fixed 1.5× gain (switching mode) and automatic pass-through mode above ~4.7V input, enabling efficient drive of 3.0–4.0V white LEDs without inductors. Its four current sources are internally mirrored from a single ISET resistor with 10:1 ratio and ±0.5% matching across temperature and supply.
Brightness is controlled via two independent paths: linear analog dimming (0–3.0V on BRGT pin, 0.385× scaling + 0.188V offset) and digital PWM dimming (via SD pin - active-low for LM2794TL), with soft-start ramping and thermal shutdown at 150°C (typ.). The unregulated POUT rail supports auxiliary current delivery (up to ~80mA total load) but requires external ballast resistors for LED connections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports full Li-ion battery discharge curve without brownout. |
| Output Current per Channel | Up to 20mA - set by RSET value; 124Ω yields 15mA typical at BRGT = 0V. |
| Current Matching Accuracy | ±0.5% - ensures uniform brightness across four LEDs without binning. |
| Switching Frequency | 325–675kHz - fixed-frequency operation avoids audible noise and simplifies EMI filtering. |
| Shutdown Current | 2.3µA (typ.) - enables ultra-low-power standby in battery-critical applications. |
| Charge-Pump Gain | 1.5× (switching mode) / 1× (pass mode above ~4.7V) - dynamically optimizes efficiency vs. input voltage. |
| Headroom Voltage Coefficient | 20mV/mA (typ.) - defines minimum VPOUT–VDX required for regulation; impacts max LED VF support. |
Pinout & Package
LM2794TL is housed in a thin DSBGA-14 package (2.08mm × 2.403mm × 0.600mm), optimized for space-constrained portable designs. Pin numbering follows JEDEC-standard bottom-view layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | C1+ | Positive terminal of flying capacitor C1 - critical for charge-pump energy transfer. |
| B2 | C1− | Negative terminal of flying capacitor C1 - forms 1.5× voltage doubler stage. |
| C1 | VIN | Main power input (2.7–5.5V) - supplies both logic and charge-pump circuitry. |
| D2 | GND | Power ground reference - must be low-impedance return path for all currents. |
| E1 | C2− | Negative terminal of flying capacitor C2 - completes second charge-pump phase. |
| E3, E5, E7, D6 | D1–D4 | Matched current-source outputs - connect directly to LED anodes; no external current-setting components needed. |
| C7 | ISET | Current sense input - sets reference current via resistor to GND; determines all LED currents (10:1 mirror ratio). |
| B6 | BRGT | Analog brightness control input - 0–3.0V linearly scales LED current; internal 240kΩ input resistance. |
| A7 | SD | Active-low shutdown input - pulls device into 2.3µA sleep state when LOW; no internal pull-up. |
| A5 | C2+ | Positive terminal of flying capacitor C2 - enables 1.5× voltage step-up operation. |
| A3 | POUT | Unregulated charge-pump output - delivers additional current (e.g., keypad LEDs) with ~3.0Ω output resistance. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic EMI, board area, and cost of external inductor - ideal for ultra-thin handhelds. |
| Dual dimming interface | Simultaneous analog (BRGT) and PWM (SD) control enables flexible UI brightness schemes without MCU GPIO expansion. |
| Thermal protection | Automatic shutdown at TJ ≥150°C (typ.) with hysteresis - prevents permanent damage during transient overloads. |
| Small solution size | Full 4-LED driver fits within <3mm² footprint using only five 1µF ceramic capacitors (CIN, C1, C2, CHOLD, CPOUT). |
| Pass-mode fallback | Seamlessly transitions to 1× pass-through above ~4.7V input - improves efficiency at high battery voltage. |
Applications
| Cellular Phone Keypad Backlight | Handheld PDA Display Backlight |
|---|---|
Use Scenario: Illuminating alphanumeric keypad buttons in GSM/CDMA smartphones with single-cell Li-ion supply (2.7–4.2V). IC Role / Device Role / Timing Role: Four-channel constant-current source driving parallel white LEDs; regulates current independently of forward voltage variation. Use Value: Maintains consistent button brightness across battery discharge cycle and temperature range (−30°C to +85°C ambient). |
Use Scenario: Powering TFT-LCD backlight in compact PDAs where board height is limited to <1.0mm. IC Role / Device Role / Timing Role: Switched-capacitor LED driver generating 1.5× boosted voltage (POUT) to drive series-connected LEDs. Use Value: Achieves >80% efficiency at 3.6V input while eliminating inductor height constraint - enables sub-10mm device thickness. |
| Portable Media Player UI Lighting | Ultra-Thin Handheld PC Status Indicators |
Use Scenario: Driving status LEDs (power, charging, Bluetooth) in MP3 players with dynamic brightness control. IC Role / Device Role / Timing Role: Dual-dimming controller using BRGT for smooth analog fade and SD for rapid PWM strobing effects. Use Value: Enables rich UI feedback (e.g., breathing LED patterns) with single IC and minimal firmware overhead. |
Use Scenario: Providing matched illumination for multi-color status indicators in industrial handheld PCs. IC Role / Device Role / Timing Role: Precision current-matched quad-output driver ensuring identical luminance across RGB+white indicator set. Use Value: Eliminates manual LED binning and reduces BOM count - cuts assembly cost and calibration time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2795TL | Identical functionality except active-high SD pin (internal VIN pull-up); same DSBGA-14 package and pinout. | Requires inverted logic control signal; unsuitable where MCU GPIO lacks pull-down strength. | Select LM2795TL only if system-level shutdown signaling is active-high and open-drain compatible. |
| TPS61160DRVR | Inductor-based boost converter; higher efficiency (>90%) above 3.6V but larger solution size and EMI concerns. | Supports higher LED VF (up to 24V) and higher current (up to 40mA/channel); not pin-compatible. | Choose TPS61160DRVR for applications needing >4.0V LED strings or tighter efficiency targets at expense of board area. |
Compared with LM2795TL, LM2794TL offers direct compatibility with active-low logic interfaces without external inverters; versus TPS61160DRVR, it trades peak efficiency for inductor-free compactness and lower EMI - making LM2794TL optimal for space- and noise-sensitive single-cell LED arrays.
Availability
LM2794TL is available at Aetrix Electronics and suitable for cellular phone keypad backlighting, handheld PDA display backlighting, and portable media player UI lighting requiring stable component supply across long production lifecycles.
Supply support for LM2794TL 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 LM2794TL belongs to TI's white LED driver product line, engineered specifically for ultra-compact, inductorless backlighting in battery-powered consumer electronics operating across the full Li-ion voltage range.
FAQ
What is the maximum total output current supported by the LM2794TL?
The LM2794TL supports up to 80mA total output current across all channels (D1–D4) plus POUT. This assumes sufficient headroom voltage (VPOUT − VDX ≥ kHR × IDX, where kHR = 20mV/mA typ.) and accounts for charge-pump output resistance (~3.0Ω). At 3.6V input and 3.6V LED forward voltage, maximum per-channel current is ~20mA with proper RSET selection and thermal management.
How does the LM2794TL handle input voltage variations from a discharging Li-ion battery?
The LM2794TL automatically switches between 1.5× charge-pump mode (below ~4.7V) and 1× pass-through mode (at or above ~4.7V), maintaining regulated LED current across the full 2.7V–5.5V input range. This eliminates need for external voltage regulation and preserves efficiency as battery voltage drops - a key advantage for single-cell portable systems.
Can the LM2794TL drive LEDs with forward voltage higher than 4.0V?
No - the LM2794TL is designed for white LEDs with forward voltage of 3.0V–4.0V. At 3.6V input, POUT reaches ~5.4V (1.5×), leaving only ~1.4V headroom for a 4.0V LED. Driving >4.0V LEDs risks falling out of regulation due to insufficient VPOUT–VDX margin, especially at low input voltages or elevated temperatures where kHR increases to 25mV/mA.
What is the role of the CHOLD capacitor in the LM2794TL circuit?
The CHOLD capacitor (1µF ceramic) stabilizes the internal reference voltage and improves line/load regulation performance. It reduces ripple on the current-mirror reference node, enhancing current matching accuracy and dimming linearity - particularly critical during BRGT-based analog control where small voltage errors directly scale LED current.
Is the LM2794TL pin-compatible with the LM2795TL?
Yes - the LM2794TL and LM2795TL share identical DSBGA-14 package, pinout, and electrical specifications except for shutdown polarity: LM2794TL has active-low SD (LOW = shutdown), while LM2795TL has active-high SD (HIGH = shutdown) with internal VIN pull-up. No PCB changes are required for substitution, but logic-level interface must be verified.
LM2794TL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 3.8V
- Current - Output / Channel:
- 20mA
- Frequency:
- 515kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DSBGA
LM2794TL FAQ
1.How can I place an order for LM2794TL through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2794TL 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 LM2794TL reliable?
The price and inventory of LM2794TL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2794TL is usually 5 days.
3.What payment methods are accepted for LM2794TL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2794TL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2794TL?
LM2794TL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2794TL 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 LM2794TL?
For technical support, including LM2794TL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2794TL requirements.
6.How does Aetrix verify that LM2794TL is sourced from the original manufacturer or authorized distributors?
All LM2794TL 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 LM2794TL meets industry standards.
7.What is the process for return or replacement of LM2794TL?
All LM2794TL units undergo pre-shipment inspection (PSI). If there is an issue with LM2794TL, 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 LM2794TL part is unused and in its original packaging.
Return procedure for LM2794TL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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