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Texas Instruments LM2795TLX/NOPB
- Part No.:
- LM2795TLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-WFBGA, DSBGA
- Datasheet:
-
LM2795TLX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 14DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,101
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Product details
Overview
LM2795TLX/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 keypad or display backlighting in single-cell Li-ion portable devices.
For engineers reviewing the LM2795TLX/NOPB datasheet, LM2795TLX/NOPB pinout, LM2795TLX/NOPB application, or LM2795TLX/NOPB equivalent, key selection considerations include active-high shutdown logic, DSBGA-14 package footprint, 1.5× charge-pump gain with pass-mode transition at ~4.7 V, ISET resistor-based current programming, and BRGT pin linear dimming from 0–3 V.
Technical Context
The LM2795TLX/NOPB integrates a fractional CMOS charge pump with 1.5× voltage gain (switching mode) and pass-through mode above ~4.7 V input, enabling efficient white LED driving across the full Li-ion battery range. Its internal current mirror architecture ensures ±0.5% matching between any two D1–D4 outputs, with headroom voltage dependency governed by kHR = 20 mV/mA (typ.) and output resistance ROUT = 3.0 Ω (typ.).
It supports dual brightness control: analog via 0–3 V on BRGT (linear current scaling), and digital PWM via SD pin (active-high shutdown toggling). The SD pin includes an internal pull-up to VIN for open-drain logic compatibility, distinguishing it from the LM2794's active-low SD implementation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports full discharge curve of 1-cell Li-ion batteries without external regulation. |
| Output Current per Channel | Up to 20 mA - programmable via external RSET; enables driving standard white LEDs with 3.0–4.0 V forward voltage. |
| Current Matching | ±0.5% - ensures uniform brightness across multiple LEDs without binning or calibration. |
| Switching Frequency | 325–675 kHz - keeps conducted EMI away from sensitive RF bands in cellular handsets. |
| Shutdown Current | 2.3 µA (typ.) - minimizes battery drain during sleep modes in portable equipment. |
| Charge-Pump Gain | 1.5× (switching) / 1× (pass mode) - automatically transitions at ~4.7 V to maximize efficiency across input range. |
| Package | DSBGA-14, 2.08 mm × 2.403 mm × 0.6 mm - ultra-compact footprint for space-constrained handheld PCBs. |
Pinout & Package
LM2795TLX/NOPB uses a 14-ball thin DSBGA package (2.08 mm × 2.403 mm × 0.6 mm) with JEDEC-standard bottom-view pin numbering. All pins are solder balls; no leads. Thermal performance relies on PCB copper pad area under the package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | C1+ | Positive terminal of flying capacitor C1 - forms charge-transfer path in 1.5× boost stage. |
| B2 | C1− | Negative terminal of flying capacitor C1 - completes charge-pump switching loop with C1+. |
| C1 | VIN | Main power input - supplies both charge pump and internal circuitry; accepts 2.7–5.5 V. |
| D2 | GND | Power ground reference - must be low-impedance connection to minimize noise and thermal rise. |
| E1 | C2− | Negative terminal of flying capacitor C2 - second flying cap used in charge-pump topology. |
| E3, E5, E7, D6 | D1–D4 | Constant-current LED outputs - each sinks up to 20 mA; internally matched within ±0.5%. |
| C7 | ISET | Current sense input - connects to RSET to ground; sets reference current mirrored 10:1 to D1–D4. |
| B6 | BRGT | Analog brightness control - 0–3 V input linearly scales LED current; 240 kΩ input resistance. |
| A7 | SD | Active-high shutdown - HIGH disables device (2.3 µA quiescent); internal pull-up to VIN enables open-drain control. |
| A5 | C2+ | Positive terminal of flying capacitor C2 - works with C2− to enable charge recycling in 1.5× mode. |
| A3 | POUT | Unregulated charge-pump output - provides ~1.5×VIN rail for auxiliary loads (e.g., keypad LEDs with ballast resistors). |
Key Features
| Feature | Design Value |
|---|---|
| Four matched current sources | ±0.5% matching between any pair - eliminates need for per-LED current trimming in multi-backlight systems. |
| 1.5×/1× adaptive charge pump | Auto-switches to pass mode above ~4.7 V - maintains >85% efficiency across entire 2.7–5.5 V input range. |
| Linear + PWM brightness control | BRGT pin (0–3 V) + SD pin (PWM) - enables hybrid dimming schemes for flicker-free, high-resolution brightness adjustment. |
| No inductor required | Capacitor-only topology - reduces BOM cost, board area, and EMI compared to inductive LED drivers. |
| Ultra-low shutdown current | 2.3 µA typical - extends standby time in always-on portable devices such as feature phones and PDAs. |
Applications
| White LED Display Backlights | White LED Keypad Backlights |
|---|---|
Use Scenario: Driving 4 parallel white LEDs behind TFT-LCD panels in handheld PCs or early smartphones. IC Role / Device Role / Timing Role: Constant-current sink for each LED anode tied to POUT; regulates current independent of LED VF variation. Use Value: Ensures uniform luminance across display corners using only one IC and four 1 µF ceramic capacitors - no inductors or feedback loops required. |
Use Scenario: Illuminating alphanumeric keypads in cellular handsets powered by 3.6 V nominal Li-ion batteries. IC Role / Device Role / Timing Role: Supplies 5–15 mA per key LED via D1–D4; uses POUT rail with ballast resistors for additional keys. Use Value: Maintains consistent brightness over battery discharge (2.7–4.2 V) via automatic 1.5×/1× mode switching - avoids manual gain selection. |
| 1-Cell Li-Ion Portable Devices | PDAs and Hand-Held PCs |
Use Scenario: Powering mixed LED arrays (display + status indicators) in compact consumer electronics with tight height constraints. IC Role / Device Role / Timing Role: Primary LED supply IC; SD pin accepts PWM from baseband processor for dynamic brightness scaling during UI transitions. Use Value: 2.08 mm × 2.403 mm DSBGA footprint saves >60% board area versus QFN alternatives - critical for sub-10 mm Z-height designs. |
Use Scenario: Backlighting high-resolution monochrome or color LCDs in enterprise PDAs requiring long runtime and stable luminance. IC Role / Device Role / Timing Role: Four-channel current regulator with BRGT analog dimming - enables smooth, stepless brightness ramping controlled by ARM application processor. Use Value: ±0.5% current matching prevents visible banding or streaking on large-area displays - verified across −30°C to +85°C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2794TLX/NOPB | Identical functionality except active-low SD pin (LOW = shutdown); no internal SD pull-up. | Requires active-low logic or external pull-down; incompatible with open-drain microcontroller GPIOs without level-shifting. | Select LM2794TLX/NOPB only when system-level shutdown control is natively active-low and no pull-up is desired. |
| TPS60230RTJR | Single-output 20 mA LED driver with 1.5× charge pump; no BRGT analog dimming; fixed 500 kHz fSW. | Lacks multi-channel capability and analog brightness control - suitable only for single-LED or simple on/off applications. | Choose TPS60230RTJR for cost-sensitive, single-LED designs where channel count and dimming flexibility are not required. |
Compared with LM2794TLX/NOPB, LM2795TLX/NOPB offers plug-and-play compatibility with open-drain logic and eliminates external pull-up components; versus TPS60230RTJR, it provides four matched channels and dual-mode dimming at the cost of higher BOM complexity.
Availability
LM2795TLX/NOPB is available at Aetrix Electronics and suitable for white LED backlighting, keypad illumination, and portable Li-ion-powered human interface applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2795TLX/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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2795TLX/NOPB belongs to TI's legacy LED driver product line designed specifically for low-power, multi-LED backlighting in space-constrained portable devices - emphasizing capacitor-based efficiency, precise current matching, and seamless integration with Li-ion battery systems.
FAQ
What is the shutdown behavior of the LM2795TLX/NOPB?
The LM2795TLX/NOPB features an active-high shutdown pin (SD). When SD is driven HIGH (≥0.8×VIN), the device enters shutdown mode with typical supply current of 2.3 µA. When SD is LOW, the device operates normally. An internal pull-up to VIN allows direct connection to open-drain logic outputs without external resistors - a key distinction from the LM2794TLX/NOPB's active-low SD implementation.
How is LED current programmed on the LM2795TLX/NOPB?
LED current on the LM2795TLX/NOPB is set by an external resistor (RSET) connected between the ISET pin and GND. The internal current mirror delivers 10× the RSET current to each D1–D4 output. For example, a 124 Ω resistor at 25°C yields ~15 mA per channel. The BRGT pin further scales this current linearly from 0–3 V, enabling fine analog dimming without changing RSET.
Does the LM2795TLX/NOPB require inductors?
No, the LM2795TLX/NOPB uses a switched-capacitor (charge-pump) architecture and requires only four external ceramic capacitors (C1, C2, CIN, CHOLD) - no inductors. This eliminates magnetic EMI, reduces solution size, and lowers BOM cost. TI recommends X7R/X5R 1 µF MLCCs with ≤15 mΩ ESR; Y5V/Z5U types are discouraged due to capacitance drift.
What is the function of the POUT pin on the LM2795TLX/NOPB?
The POUT pin on the LM2795TLX/NOPB provides the unregulated output of the 1.5× charge pump (~1.5×VIN). It can supply additional current (beyond D1–D4) to auxiliary LEDs or circuits via external ballast resistors. Because POUT is unregulated, its voltage droops under load (ROUT ≈ 3.0 Ω), making it best suited for non-critical loads like keypad LEDs where precise current matching is unnecessary.
How does the LM2795TLX/NOPB handle input voltage variations across a Li-ion battery discharge cycle?
The LM2795TLX/NOPB automatically transitions between 1.5× charge-pump mode (below ~4.7 V) and 1× pass mode (at or above ~4.7 V), maintaining regulated LED current from 2.7 V to 5.5 V. This eliminates efficiency cliffs and ensures stable brightness across the full Li-ion discharge curve (3.0–4.2 V typical), unlike fixed-gain drivers that require external LDOs or complex power-path management.
LM2795TLX/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
LM2795TLX/NOPB FAQ
1.How can I place an order for LM2795TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2795TLX/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 LM2795TLX/NOPB reliable?
The price and inventory of LM2795TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2795TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2795TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2795TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2795TLX/NOPB?
LM2795TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2795TLX/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 LM2795TLX/NOPB?
For technical support, including LM2795TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2795TLX/NOPB requirements.
6.How does Aetrix verify that LM2795TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2795TLX/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 LM2795TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2795TLX/NOPB?
All LM2795TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2795TLX/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 LM2795TLX/NOPB part is unused and in its original packaging.
Return procedure for LM2795TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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