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Texas Instruments LM2794TLX/NOPB
- Part No.:
- LM2794TLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-WFBGA, DSBGA
- Datasheet:
-
LM2794TLX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 14DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2794TLX/NOPB from Texas Instruments is a current-regulated switched-capacitor white LED driver IC with four matched constant-current outputs, ±0.5% output current matching, 325–675 kHz switching frequency, and analog/PWM brightness control. It operates from 2.7V to 5.5V input and delivers up to 20 mA per channel for keypad or display backlighting in single-cell Li-ion portable devices.
For engineers reviewing the LM2794TLX/NOPB datasheet, LM2794TLX/NOPB pinout, LM2794TLX/NOPB application, or LM2794TLX/NOPB equivalent, key selection considerations include active-low shutdown behavior, DSBGA-14 package footprint, ISET resistor-based current programming, BRGT voltage-controlled dimming range (0–3 V), and POUT rail availability for auxiliary LED drive.
Technical Context
The LM2794TLX/NOPB implements a 1.5×/1× fractional CMOS charge pump with automatic mode transition at ~4.7 V input: below that threshold, it boosts POUT to 1.5×VIN; above, it enters pass mode with POUT = VIN. Four independent current sources-each mirroring ISET current at 10:1 ratio-are internally connected between POUT and D1–D4 outputs.
Brightness control is dual-mode: linear analog via 0–3 V on BRGT (with 240 kΩ input resistance and 0.385× scaling), or digital PWM via SD pin (active-low logic, 2.3 µA shutdown current). The device includes thermal shutdown (150°C trip), soft-start ramping, and headroom-aware current regulation requiring ≥20 mV/mA VHR across each output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports full discharge curve of single-cell Li-ion batteries without external LDO. |
| Output Current per Channel | Up to 20 mA - programmable via RSET; typical 15.25 mA at 3.6 V VIN and 124 Ω RSET. |
| Current Matching | ±0.5% - ensures uniform brightness across four LEDs without binning or trimming. |
| Switching Frequency | 325–675 kHz - fixed-frequency operation avoids audible noise and simplifies EMI filtering. |
| Shutdown Current | 2.3 µA (typ.) - enables ultra-low-power standby in battery-critical applications. |
| Package | DSBGA-14, 2.08 mm × 2.403 mm × 0.6 mm - ultra-compact chip-scale package for space-constrained handheld PCBs. |
| Operating Temperature | −30°C to +85°C ambient - qualified for consumer and industrial portable equipment environments. |
Pinout & Package
LM2794TLX/NOPB uses a 14-ball thin DSBGA package (2.08 mm × 2.403 mm, 0.6 mm height) with JEDEC-standard ball numbering. Pin functions are validated per TI SNVS168L Rev. May 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (C1+) | Charge pump flying capacitor positive terminal | Connects to C1 anode; forms half of 1.5× charge-pump stage with C1−. |
| B2 (C1−) | Charge pump flying capacitor negative terminal | Connects to C1 cathode; critical for stable charge transfer and low ripple. |
| C1 (VIN) | Main power supply input | Accepts 2.7–5.5 V; powers internal circuitry and feeds charge pump. |
| D2 (GND) | Power ground reference | Low-impedance return path for all currents; must be tied to system ground plane. |
| E1 (C2−) | Second flying capacitor negative terminal | Completes second phase of 1.5× charge-pump; pairs with C2+ (A5). |
| E3/E5/E7/D6 (D1–D4) | Constant-current LED output terminals | Each sinks up to 20 mA; directly connect to LED cathodes for regulated drive. |
| C7 (ISET) | Current sense reference input | Connect 1% resistor to GND; sets base current mirrored 10× to D1–D4. |
| B6 (BRGT) | Analog brightness control input | 0–3 V linearly scales LED current; 240 kΩ input resistance minimizes loading. |
| A7 (SD) | Active-low shutdown control | LOW disables device and reduces IQ to 2.3 µA; no internal pull-up required. |
| A5 (C2+) | Second flying capacitor positive terminal | Completes 1.5× charge-pump loop; requires low-ESR ceramic capacitor. |
| A3 (POUT) | Unregulated charge-pump output rail | Provides ~1.5×VIN (or VIN in pass mode); usable for auxiliary LED strings with ballast resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Four matched current sources | ±0.5% matching ensures consistent LED luminance across displays/keypads without calibration. |
| 1.5×/1× auto-switching charge pump | Eliminates inductor; maintains regulation across full Li-ion voltage range (2.7–4.2 V) with minimal BOM count. |
| Independent analog and PWM dimming | BRGT pin enables smooth linear control; SD pin accepts standard PWM signals for digital brightness management. |
| Ultra-small DSBGA-14 footprint | 2.08 mm × 2.403 mm area saves >60% board space vs. QFN alternatives; ideal for slim mobile designs. |
| Thermal shutdown protection | Engages at TJ = 150°C (typ.), disengages at 140°C (typ.); prevents permanent damage during overload or poor heatsinking. |
Applications
| White LED Display Backlights | White LED Keypad Backlights |
|---|---|
Use Scenario: Driving four parallel white LEDs behind a TFT-LCD panel in a handheld PDA with 3.6 V nominal Li-ion supply. IC Role / Device Role / Timing Role: LM2794TLX/NOPB acts as constant-current source array, regulating each LED at 15 mA while maintaining <0.5% current mismatch across temperature. Use Value: Eliminates need for discrete current-setting resistors per LED, reduces thermal variance, and enables uniform grayscale rendering. | Use Scenario: Illuminating alphanumeric keypad LEDs in a cellular phone where input voltage varies from 4.2 V (fully charged) to 2.7 V (discharged). IC Role / Device Role / Timing Role: LM2794TLX/NOPB serves as adaptive backlight controller, automatically switching between 1.5× boost and pass mode to sustain LED forward voltage headroom. Use Value: Maintains consistent keypad brightness over full battery life without software intervention or voltage monitoring. |
| 1-Cell Li-Ion Portable Devices | Compact Handheld Electronics |
Use Scenario: Powering status indicator LEDs in a Bluetooth headset powered by a 3.7 V Li-ion cell with tight PCB area constraints. IC Role / Device Role / Timing Role: LM2794TLX/NOPB functions as integrated LED driver and voltage scaler, delivering regulated current while minimizing quiescent draw in standby. Use Value: Achieves 2.3 µA shutdown current and DSBGA-14 footprint-critical for multi-week battery life and miniaturized form factors. | Use Scenario: Backlighting UI icons in a wearable fitness tracker with aggressive thickness targets (<8 mm) and no space for magnetic components. IC Role / Device Role / Timing Role: LM2794TLX/NOPB replaces inductor-based boost converters, providing inductorless 1.5× voltage gain and four independent current channels. Use Value: Removes EMI-sensitive magnetics, reduces profile by >0.5 mm, and simplifies layout with only five external ceramic capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2795TLX/NOPB | Identical architecture and pinout, but features active-high SD pin with internal VIN pull-up. | Suitable where host MCU GPIO lacks high-drive capability or requires open-drain control. | Select LM2795TLX/NOPB only when active-high shutdown logic is required; otherwise LM2794TLX/NOPB offers direct compatibility with standard CMOS LOW-active signals. |
| TPS61160DRVR | Inductor-based boost converter with single 30-mA output; no multi-channel current matching or BRGT analog dimming. | Used in cost-sensitive single-LED applications where ±0.5% matching is unnecessary. | Choose TPS61160DRVR only for single-LED systems needing higher peak current; LM2794TLX/NOPB remains superior for quad-LED uniformity and inductorless design. |
Compared with LM2795TLX/NOPB, LM2794TLX/NOPB provides identical performance with active-low shutdown-reducing external logic complexity. Against TPS61160DRVR, LM2794TLX/NOPB delivers four matched outputs without inductors, enabling smaller size and lower EMI in multi-LED layouts.
Availability
LM2794TLX/NOPB is available at Aetrix Electronics and suitable for white LED backlighting, portable display illumination, and compact handheld electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2794TLX/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 and LED lighting solutions.
LM2794TLX/NOPB belongs to TI's switched-capacitor LED driver product line, designed specifically for inductorless, multi-channel white LED biasing in space- and power-constrained battery-operated devices.
FAQ
What is the shutdown behavior of the LM2794TLX/NOPB?
The LM2794TLX/NOPB features an active-low shutdown pin (SD). When SD is driven LOW, the device enters shutdown mode with typical supply current reduced to 2.3 µA. When SD is HIGH, the LM2794TLX/NOPB operates normally. There is no internal pull-up or pull-down on the SD pin, so external logic must actively drive the signal level. This behavior distinguishes LM2794TLX/NOPB from the pin-compatible LM2795TLX/NOPB, which uses active-high shutdown.
How is LED current programmed on the LM2794TLX/NOPB?
LED current on the LM2794TLX/NOPB is set using an external precision resistor (RSET) connected between the ISET pin and GND. The internal current mirror delivers 10× the ISET current to each of D1–D4 outputs. For example, a 124 Ω resistor at 3.6 V VIN yields ~15.25 mA per channel. The BRGT pin allows further analog scaling (0–3 V) of this base current, enabling fine-grained brightness control without changing RSET.
Can the LM2794TLX/NOPB drive more than four LEDs?
Yes-the LM2794TLX/NOPB supports parallel connection of its D1–D4 outputs to increase per-LED current. For instance, connecting D1 and D2 together drives one LED with up to 40 mA (2×15 mA), provided RSET and BRGT are adjusted to set 15 mA per channel. All electrical specifications-including current matching, headroom requirements, and thermal limits-remain valid in parallel configurations, as confirmed in TI SNVS168L Section "Parallel Dx Outputs for Increased Current Drive".
What is the function of the POUT pin on the LM2794TLX/NOPB?
The POUT pin on the LM2794TLX/NOPB provides the unregulated output of the 1.5× charge pump-nominally 1.5×VIN below ~4.7 V input, or VIN in pass mode above that threshold. It can supply additional current (beyond D1–D4) to auxiliary LEDs via ballast resistors. However, because POUT is unregulated and exhibits ~3.0 Ω output resistance, its voltage droops under load; thus, it is best suited for non-critical backlighting like keypads where precise current matching is not required.
Does the LM2794TLX/NOPB require specific capacitor types?
Yes-the LM2794TLX/NOPB requires four low-ESR ceramic capacitors (CIN, C1, C2, CHOLD), each rated ≥1 µF with X7R or X5R dielectric. TI explicitly warns against Y5V/Z5U ceramics due to severe capacitance loss (>80%) over voltage and temperature, which risks failure to meet minimum capacitance requirements. Typical values are 1 µF, ≤15 mΩ ESR; recommended vendors include Murata, TDK, and Taiyo Yuden per TI Application Note SNVS168L Table 1.
LM2794TLX/NOPB 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
LM2794TLX/NOPB FAQ
1.How can I place an order for LM2794TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2794TLX/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 LM2794TLX/NOPB reliable?
The price and inventory of LM2794TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2794TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2794TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2794TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2794TLX/NOPB?
LM2794TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2794TLX/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 LM2794TLX/NOPB?
For technical support, including LM2794TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2794TLX/NOPB requirements.
6.How does Aetrix verify that LM2794TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2794TLX/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 LM2794TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2794TLX/NOPB?
All LM2794TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2794TLX/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 LM2794TLX/NOPB part is unused and in its original packaging.
Return procedure for LM2794TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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