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Texas Instruments LM2795BLX/NOPB
- Part No.:
- LM2795BLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 14-WFBGA, DSBGA
- Datasheet:
-
LM2795BLX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 14DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,161
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Product details
Overview
LM2795BLX/NOPB from Texas Instruments is a current-regulated switched-capacitor white LED driver IC with analog and PWM brightness control, delivering up to 20mA per channel across four matched outputs (D1–D4), operating from 2.7V to 5.5V input, and featuring active-high shutdown for Li-ion–powered handheld displays.
For engineers reviewing the LM2795BLX/NOPB datasheet, LM2795BLX/NOPB pinout, LM2795BLX/NOPB application, or LM2795BLX/NOPB equivalent, this page provides verified functional context, DSBGA-14 pin mapping, headroom voltage constraints, charge-pump mode transition at 4.7V, and real-world current matching performance within ±0.5%.
Technical Context
The LM2795BLX/NOPB integrates a 1.5×/1× fractional CMOS charge pump with four independent, matched current sources. It operates in charge-pump mode below ~4.7V input (POUT ≈ 1.5 × VIN) and transitions to pass mode above that threshold (POUT = VIN), minimizing switching losses while maintaining regulation.
Current setting is determined by an external resistor on ISET (10:1 mirror ratio), while BRGT accepts 0–3.0V analog control for linear dimming; SD enables active-high shutdown with internal VIN pull-up-distinct from the LM2794's active-low behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports full Li-ion battery discharge curve without external LDO. |
| Max Output Current per Channel | 20mA - sufficient to drive standard white LEDs at full brightness with thermal margin. |
| Current Matching Accuracy | ±0.5% - ensures uniform backlight luminance across multiple LEDs without binning. |
| Switching Frequency | 325–675kHz - fixed-frequency operation avoids audible noise and simplifies EMI filtering. |
| Shutdown Current | 2.3µA typical - enables ultra-low-power standby in portable devices. |
| Charge-Pump Gain Modes | 1.5× (VIN < 4.7V) and 1× (VIN ≥ 4.7V) - auto-selects optimal efficiency point per input voltage. |
| Headroom Voltage Coefficient | 25mV/mA (worst-case) - defines minimum POUT-to-LED forward voltage margin required for regulation. |
Pinout & Package
LM2795BLX/NOPB uses a thin-profile DSBGA-14 package (2.08mm × 2.403mm × 0.600mm), optimized for space-constrained mobile PCBs. 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 transfer in 1.5× boost stage. |
| B2 | C1− | Negative terminal of flying capacitor C1 - completes charge-pump switching loop. |
| C1 | VIN | Main power input - supplies both logic and charge-pump circuitry; accepts 2.7–5.5V. |
| D2 | GND | Power ground reference - must be low-impedance connection to minimize noise coupling. |
| E1 | C2− | Negative terminal of flying capacitor C2 - second charge-pump stage node. |
| E3, E5, E7, D6 | D1–D4 | Matched constant-current LED outputs - each sinks up to 20mA with ±0.5% matching. |
| C7 | ISET | Current sense reference input - connects to ground via precision resistor to set output current (10:1 mirror). |
| B6 | BRGT | Analog brightness control - 0–3.0V input linearly scales LED current; internal 240kΩ input resistance. |
| A7 | SD | Active-high shutdown - pulls high internally (LM2795-specific); drives device into 2.3µA sleep state. |
| A5 | C2+ | Positive terminal of flying capacitor C2 - completes second-stage charge transfer path. |
| A3 | POUT | Unregulated charge-pump output - supplies ~1.5×VIN (or VIN in pass mode) for auxiliary loads or keypad LEDs. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI; reduces BOM cost and board area by >30% vs. inductive boost drivers. |
| Integrated soft-start | Ramps reference voltage internally to limit inrush current during power-up - prevents LED flash and supply droop. |
| Thermal shutdown protection | Engages at TJ = 150°C (typ.), disengages at 140°C (typ.) - prevents permanent damage under sustained overload or poor thermal layout. |
| Low-noise constant-frequency operation | 325–675kHz switching avoids sensitive RF bands (e.g., GSM, Bluetooth) and enables predictable EMI filter design. |
| Flexible brightness control | Supports simultaneous analog (BRGT) and digital (PWM on SD) dimming - enables hybrid control schemes for flicker-free UI effects. |
Applications
| White LED Display Backlight | White LED Keypad Backlight |
|---|---|
Use Scenario: Driving four parallel white LEDs behind a QVGA LCD panel in a handheld PDA powered by a single-cell Li-ion battery (2.7–4.2V). IC Role / Device Role / Timing Role: Regulated current source with matched outputs; manages headroom voltage dynamically as battery discharges and POUT transitions between 1.5× and 1× modes. Use Value: Maintains consistent display luminance across full battery range without requiring external voltage regulation or LED current recalibration. |
Use Scenario: Illuminating 2–4 discrete keypad LEDs in a cellular phone with variable brightness controlled via host MCU PWM signal. IC Role / Device Role / Timing Role: Constant-current sink with active-high shutdown; SD pin accepts direct GPIO control for rapid on/off cycling. Use Value: Enables zero-latency keypad illumination response and sub-µA system standby current when LEDs are off. |
| 1-Cell Li-Ion Portable Equipment | Compact Handheld PC Backlight |
Use Scenario: Powering dual-channel LED strings in a ruggedized handheld PC where board space and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Charge-pump LED driver with parallel-output capability (e.g., D1+D2 → LED1, D3+D4 → LED2); supports up to 40mA per string. Use Value: Doubles per-string current without increasing component count or footprint - simplifies optical design and improves light uniformity. |
Use Scenario: Delivering stable 15mA per LED to a 4-LED edge-lit backlight in a 7-inch tablet with tight mechanical stack-up. IC Role / Device Role / Timing Role: Precision current regulator with ±0.5% matching and 2.3µA shutdown - minimizes luminance variation and extends battery runtime. Use Value: Eliminates visible brightness gradients across display edges and enables >10-hour video playback on single charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2794BLX/NOPB | Active-low SD pin; no internal pull-up; identical charge-pump, current matching, and pinout. | Requires active-low logic control; unsuitable for open-drain MCU GPIO without level-shifting. | Select when system-level shutdown signaling is inverted or when using legacy LM2794-based firmware. |
| TPS61160DRVR | Inductive boost topology; 1.2MHz switching; integrated MOSFETs; higher efficiency above 4V but requires inductor. | Better efficiency at high VIN (>4.2V); larger solution size; incompatible pinout and external component set. | Prefer for new designs needing >90% efficiency at full battery voltage or driving >20mA per LED. |
Compared with LM2794BLX/NOPB, the LM2795BLX/NOPB offers simplified active-high shutdown interface and eliminates need for external pull-up; versus TPS61160DRVR, it trades peak efficiency for smaller footprint and lower EMI, making it optimal for compact, cost-sensitive handheld displays.
Availability
LM2795BLX/NOPB is available at Aetrix Electronics and suitable for white LED display backlights, keypad illumination, and 1-cell Li-ion portable equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2795BLX/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 over 50 years of innovation in energy-efficient electronics.
The LM2795BLX/NOPB belongs to TI's LED lighting driver product line, designed specifically for space-constrained, battery-powered consumer devices requiring precise current regulation and minimal external components.
FAQ
What is the key functional difference between LM2795BLX/NOPB and LM2794BLX/NOPB?
The LM2795BLX/NOPB features an active-high shutdown (SD) pin with internal VIN pull-up, enabling direct connection to open-drain or rail-to-rail CMOS logic; the LM2794BLX/NOPB uses active-low SD with no internal pull-up. All other electrical characteristics-including current matching (±0.5%), charge-pump operation, pinout, and DSBGA-14 package-are identical. This makes LM2795BLX/NOPB ideal for systems where MCU GPIO defaults to high-impedance or requires simplified control logic without external resistors.
How does the LM2795BLX/NOPB manage headroom voltage across its LED outputs?
The LM2795BLX/NOPB requires sufficient headroom voltage (VHR = VPOUT − VDX) to maintain regulation, defined by VHR-MIN = kHR × IDX (kHR = 25mV/mA worst-case). For example, at 20mA per channel, minimum VHR is 0.5V. If VDX = 3.6V and VIN = 3.0V, POUT ≈ 4.5V (1.5× mode), yielding VHR = 0.9V - adequate for regulation. Below this margin, current drops nonlinearly. Designers must verify VHR ≥ kHR × IDX across full temperature and voltage ranges using Equation (8) from the datasheet.
Can the LM2795BLX/NOPB drive more than four LEDs?
Yes - outputs D1–D4 can be paralleled to increase per-string current. For instance, connecting D1+D2 to one LED delivers up to 40mA (2 × 20mA), provided RSET and BRGT are adjusted so each channel contributes half the target current (e.g., 20mA per channel for 40mA total). The LM2795BLX/NOPB's current matching and thermal protection remain fully functional in parallel configurations, and all Electrical Characteristics specifications apply unchanged.
What capacitor types are recommended for LM2795BLX/NOPB, and why?
Only X7R or X5R multilayer ceramic capacitors (MLCCs) rated ≥1µF and ≤15mΩ ESR are recommended for C1, C2, CIN, and CHOLD. These offer stable capacitance over temperature (±15% from −55°C to +125°C for X7R), tight tolerance (±10%), and low voltage coefficient - ensuring reliable charge-pump operation. Y5V/Z5U ceramics are prohibited: their capacitance can drop to 10% of nominal under bias/temperature, causing startup failure, output droop, or excessive ripple. TI recommends Murata, TDK, and Taiyo Yuden as qualified suppliers.
Does LM2795BLX/NOPB support PWM dimming, and how is it implemented?
Yes - PWM dimming is implemented via the SD pin. Applying a PWM signal to SD toggles the LM2795BLX/NOPB between active and shutdown states; perceived brightness is proportional to duty cycle. For linear control, PWM frequency must exceed 100Hz to avoid visible flicker, and period must exceed 100µs (device turn-on time). At 50% duty cycle, average LED current equals 50% of the programmed value (e.g., 15mA × 50% = 7.5mA). Unlike analog dimming, PWM preserves color consistency and eliminates low-current nonlinearity.
LM2795BLX/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
LM2795BLX/NOPB FAQ
1.How can I place an order for LM2795BLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2795BLX/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 LM2795BLX/NOPB reliable?
The price and inventory of LM2795BLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2795BLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2795BLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2795BLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2795BLX/NOPB?
LM2795BLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2795BLX/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 LM2795BLX/NOPB?
For technical support, including LM2795BLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2795BLX/NOPB requirements.
6.How does Aetrix verify that LM2795BLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2795BLX/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 LM2795BLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2795BLX/NOPB?
All LM2795BLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2795BLX/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 LM2795BLX/NOPB part is unused and in its original packaging.
Return procedure for LM2795BLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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