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Texas Instruments LM2794TL/NOPB
- Part No.:
- LM2794TL/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-WFBGA, DSBGA
- Datasheet:
-
LM2794TL/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 14DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,132
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Product details
Overview
LM2794TL/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 (80 mA total) for portable display backlighting.
For engineers reviewing the LM2794TL/NOPB datasheet, LM2794TL/NOPB pinout, LM2794TL/NOPB application, or LM2794TL/NOPB equivalent, this page provides verified technical context, DSBGA-14 pin mapping, real-world headroom voltage constraints, charge-pump mode transition behavior at 4.7 V, and validated alternative options for LED backlight designs in Li-ion-powered handheld devices.
Technical Context
The LM2794TL/NOPB implements a fractional 1.5×/1× CMOS charge pump with internal pass-mode transition at ~4.7 V input - below which it boosts POUT to 1.5×VIN, above which POUT follows VIN directly. Its four current sources are mirrored from ISET with 10:1 ratio and share a common POUT rail.
LED current is set by RSET and scaled linearly via BRGT (0–3 V), while shutdown is active-low on SD. Headroom voltage (VPOUT − VDX) must exceed kHR × IDX (kHR = 20 mV/mA typ.) for regulation; insufficient headroom causes current droop and inter-LED mismatch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports full Li-ion battery discharge curve without external LDO. |
| Output Current per Channel | Up to 20 mA - enables driving four 3.6 V white LEDs at 15 mA each (60 mA total) with <0.5% matching. |
| Switching Frequency | 325–675 kHz - fixed-frequency operation avoids audible noise and simplifies EMI filtering. |
| Shutdown Current | 2.3 µA typ. - preserves battery life during display-off states in portable systems. |
| Current Matching | ±0.5% between any two outputs - ensures uniform brightness across multi-LED displays without binning. |
| Charge-Pump Gain | 1.5× (boost) or 1× (pass mode) - automatically transitions at ~4.7 V to maximize efficiency across input range. |
| Headroom Requirement | ≥20 mV/mA × IDX - defines minimum (VPOUT − VDX) needed to maintain regulation; impacts max LED VF support. |
Pinout & Package
LM2794TL/NOPB uses a 2.08 mm × 2.403 mm × 0.600 mm thin DSBGA-14 package with bottom-side ball array. Pin numbering follows JEDEC standard (revised April 2002); physical layout matches TI SNVS168L pin diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | C1+ | Positive terminal of flying capacitor C1 - connects to internal charge-pump switch node. |
| B2 | C1− | Negative terminal of flying capacitor C1 - forms first stage of 1.5× charge-pump network. |
| C1 | VIN | Main power input - supplies both logic and charge-pump circuitry; accepts 2.7–5.5 V. |
| D2 | GND | Power ground reference - must be low-impedance connection to minimize noise coupling into current mirrors. |
| E1 | C2− | Negative terminal of flying capacitor C2 - completes second stage of charge-pump topology. |
| E3, E5, E7, D6 | D1–D4 | Constant-current LED outputs - each sinks up to 20 mA; internally connected to POUT rail. |
| C7 | ISET | Current sense input - sets reference current via external resistor; 10:1 mirror ratio to D1–D4. |
| B6 | BRGT | Analog brightness control - 0–3 V input linearly scales LED current; 240 kΩ input resistance. |
| A7 | SD | Active-low shutdown - pulls supply current to 2.3 µA when LOW; no internal pull-up. |
| A5 | C2+ | Positive terminal of flying capacitor C2 - critical for stable 1.5× voltage generation. |
| A3 | POUT | Charge-pump output rail - unregulated 1.5×VIN (or VIN in pass mode); can source additional current. |
Key Features
| Feature | Design Value |
|---|---|
| Four matched current sources | ±0.5% matching ensures consistent LED brightness without optical compensation or binning. |
| 1.5×/1× auto-switching charge pump | Eliminates need for inductor while maintaining >80% efficiency across 2.7–5.5 V input range. |
| Analog + PWM brightness control | BRGT pin enables smooth dimming; SD pin accepts PWM for digital control without added circuitry. |
| DSBGA-14 ultra-thin package | 2.08 mm × 2.403 mm footprint saves PCB area in space-constrained handhelds and wearables. |
| No-inductor solution | Reduces BOM cost and eliminates magnetic EMI concerns typical of inductive boost converters. |
Applications
| Display Backlighting | Keypad Illumination |
|---|---|
|
Use Scenario: Driving four 3.6 V white LEDs in a PDA or handheld PC main display. IC Role / Device Role / Timing Role: Provides matched constant current to each LED anode via D1–D4 outputs, using POUT as common cathode rail. Use Value: Eliminates brightness variation across display corners; supports analog dimming down to 0 V BRGT for zero-light standby. |
Use Scenario: Illuminating alphanumeric keypad LEDs in cellular phones powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Delivers 5–10 mA per LED through parallel-connected D1/D2 and D3/D4 outputs, leveraging POUT for auxiliary current. Use Value: Enables independent brightness control per key group using BRGT voltage scaling; maintains uniformity despite varying LED forward voltages. |
| Portable Media Player UI | Wearable Device Indicator |
|
Use Scenario: Backlighting segmented OLED status indicators in MP3 players with 3.0–4.2 V battery input. IC Role / Device Role / Timing Role: Operates in 1.5× boost mode below 4.7 V to sustain 3.8 V LED forward voltage; switches to pass mode above 4.7 V to reduce losses. Use Value: Extends runtime by 12% vs fixed-gain solutions; thermal shutdown at 150°C prevents damage during extended playback. |
Use Scenario: Driving dual-color indicator LEDs in fitness trackers where board height <0.8 mm is mandatory. IC Role / Device Role / Timing Role: Uses DSBGA-14 package and ceramic-only external components (C1/C2/CIN/CHOLD) to meet mechanical stack-up constraints. Use Value: Achieves 0.6 mm max height including capacitors; 2.3 µA shutdown current extends battery life to >6 months in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2795TL/NOPB | Active-high SD pin with internal VIN pull-up; identical electrical specs and pinout. | Requires inverted logic control signal; suitable for systems with open-drain GPIOs. | Select LM2795TL/NOPB only when active-high shutdown is required; not drop-in compatible with LM2794TL/NOPB. |
| TPS61160DRVR | Inductor-based boost converter; 1.2 MHz switching; 30 V output capability; no POUT rail. | Supports higher LED VF (up to 30 V) but requires magnetics and has larger solution size. | Choose TPS61160DRVR for >4 V LED strings or when higher efficiency above 4.5 V is critical; not pin-compatible. |
Compared with LM2795TL/NOPB, LM2794TL/NOPB offers simpler GPIO interface for active-low control; compared with TPS61160DRVR, it trades higher-voltage flexibility for inductor-free compactness and lower EMI in RF-sensitive handhelds.
Availability
LM2794TL/NOPB is available at Aetrix Electronics and suitable for white LED display backlights, keypad illumination, portable media player UIs, and wearable device indicators requiring stable component supply and long-term production continuity.
Supply support for LM2794TL/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 experience in portable power and LED lighting solutions.
The LM2794TL/NOPB belongs to TI's switched-capacitor LED driver product line, designed specifically for ultra-compact, inductorless backlighting in battery-powered handheld devices operating across the full Li-ion voltage range.
FAQ
What is the maximum LED forward voltage supported by LM2794TL/NOPB?
The LM2794TL/NOPB supports LED forward voltages up to 3.8 V under typical conditions (IDX ≤15 mA, VIN ≥3.0 V). This limit arises from headroom requirements: VPOUT − VDX must remain ≥20 mV/mA × IDX. At VIN = 3.6 V, POUT ≈5.4 V (1.5×), allowing up to 3.8 V LED VF while maintaining 1.6 V headroom for 15 mA drive. Exceeding this risks current droop and mismatch.
How does LM2794TL/NOPB handle input voltage transitions across the 4.7 V charge-pump threshold?
The LM2794TL/NOPB automatically switches between 1.5× boost mode (VIN <4.7 V) and 1× pass mode (VIN ≥4.7 V) using internal hysteresis (250 mV). In pass mode, POUT tracks VIN directly, reducing switching losses and improving efficiency above 4.7 V. No external control or mode pin is required - the transition is seamless and transparent to system design.
Can multiple LM2794TL/NOPB outputs be paralleled to increase per-LED current?
Yes - D1–D4 outputs may be wired in parallel (e.g., D1+D2 to one LED) to deliver up to 40 mA per LED. RSET and BRGT must be adjusted so each contributing output delivers half the target current (e.g., 20 mA per output for 40 mA total). Electrical specs including matching and headroom apply identically to paralleled configurations.
What capacitor types are recommended for LM2794TL/NOPB, and why?
Only X7R or X5R multilayer ceramic capacitors (1 µF, ≤15 mΩ ESR) are recommended for C1, C2, CIN, and CHOLD. Their tight tolerance (±10%), stable capacitance over temperature, and low ESR ensure reliable charge-pump operation. Y5V/Z5U ceramics are prohibited - their capacitance can drop to 10% of nominal under bias/temperature, causing startup failure or regulation loss.
Is LM2794TL/NOPB pin-compatible with LM2795TL/NOPB?
Yes - LM2794TL/NOPB and LM2795TL/NOPB share identical pinout, package, and electrical specifications except for SD pin logic polarity: LM2794TL/NOPB has active-low shutdown, while LM2795TL/NOPB has active-high shutdown with internal VIN pull-up. Swapping them requires inverting the SD control signal; no PCB change is needed if logic level is adapted.
LM2794TL/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2794TL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2794TL/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 LM2794TL/NOPB reliable?
The price and inventory of LM2794TL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2794TL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2794TL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2794TL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2794TL/NOPB?
LM2794TL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2794TL/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 LM2794TL/NOPB?
For technical support, including LM2794TL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2794TL/NOPB requirements.
6.How does Aetrix verify that LM2794TL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2794TL/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 LM2794TL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2794TL/NOPB?
All LM2794TL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2794TL/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 LM2794TL/NOPB part is unused and in its original packaging.
Return procedure for LM2794TL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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