Texas Instruments LM2795TL

Overview

LM2795TL 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 driving up to four white LEDs in portable backlight applications.

For engineers reviewing the LM2795TL datasheet, LM2795TL pinout, LM2795TL application, or LM2795TL equivalent, this page provides verified technical context, real-world design meaning of key specs, validated DSBGA package mapping, confirmed pin functions, and two rigorously cross-checked alternative parts for LED backlighting designs requiring stable current regulation and compact capacitor-based power conversion.

Technical Context

The LM2795TL implements a 1.5×/1× fractional CMOS charge pump with automatic mode switching: it operates in 1.5× boost mode below ~4.7 V input and transitions to pass-through (1×) mode above that threshold. Its four current sources are internally mirrored from a single ISET resistor with 10:1 ratio, enabling precise per-channel current setting and tight matching.

Brightness control is dual-mode: linear analog control via 0–3 V applied to BRGT pin, and digital PWM dimming via SD pin - where high logic level triggers shutdown (active-high), distinguishing it from the LM2794TL. The device integrates soft-start, thermal shutdown at 150°C (typ.), and supports parallel output configurations without performance degradation.

Key Specifications

Pinout & Package

LM2795TL is housed in a thin DSBGA package measuring 2.08 mm × 2.403 mm × 0.600 mm, optimized for space-constrained portable PCBs. The 14-ball array uses JEDEC-standard bottom-view numbering revised in April 2002.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with LM2794TL, LM2795TL's active-high SD simplifies interface to most modern microcontrollers; compared with TPS61160DRVR, LM2795TL delivers superior space efficiency and lower shutdown current but lacks digital configurability and high-Vf capability.

Availability

LM2795TL is available at Aetrix Electronics and suitable for white LED display backlights, keypad illumination, and 1-cell Li-ion portable electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LM2795TL 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 LM2795TL belongs to TI's LED backlight driver product line, engineered specifically for space- and power-constrained handheld devices requiring high-efficiency, inductorless LED current regulation with analog and digital dimming flexibility.

FAQ

What is the shutdown behavior of the LM2795TL?

The LM2795TL features an active-high shutdown pin (SD). When SD is driven HIGH (≥0.8×VIN), the device enters shutdown mode, reducing quiescent current to 2.3 µA (typ.). An internal pull-up to VIN allows direct connection to open-drain logic outputs. In contrast, the LM2794TL uses active-low shutdown. This distinction makes LM2795TL ideal for systems where high-level GPIO control is standard. Always verify SD logic levels against actual VIN during design validation.

How does the LM2795TL regulate LED current?

The LM2795TL regulates LED current using a precision current mirror architecture. A single external resistor (RSET) connected to the ISET pin sets a reference current, which is then mirrored 10:1 to each of the four D1–D4 outputs. Current matching between any two outputs is guaranteed at ±0.5%, independent of LED forward voltage variation. The BRGT pin further modulates this current linearly from 0–3 V, enabling smooth analog dimming without altering RSET.

Can the LM2795TL drive more than four LEDs?

Yes - the LM2795TL supports parallel output configurations. D1–D4 can be wired in pairs (e.g., D1+D2, D3+D4) to deliver up to 40 mA per LED string while preserving current matching. Additionally, the unregulated POUT pin provides ~1.5×VIN rail for driving auxiliary LEDs via ballast resistors. However, POUT-driven LEDs lack current regulation and brightness matching, making them best suited for non-critical indicators like keypads rather than primary displays.

What capacitor types are recommended for the LM2795TL?

Texas Instruments specifies X7R or X5R multilayer ceramic capacitors (MLCCs) for C1, C2, CIN, and CHOLD - all rated at 1 µF with ≤15 mΩ ESR. These offer stable capacitance over temperature and voltage, essential for predictable charge-pump operation. Y5V or Z5U ceramics are explicitly discouraged due to severe capacitance loss (down to 10% of nominal) under bias or temperature swing, which risks failure to meet minimum capacitance requirements and causes regulation instability in the LM2795TL.

Does the LM2795TL require thermal management on PCB?

Yes - although the LM2795TL includes thermal shutdown at 150°C (typ.), its DSBGA package has θJA = 125°C/W on a standard 2-layer board. Under maximum load (80 mA total), power dissipation can exceed 400 mW. To ensure reliable operation across −30°C to +85°C ambient, use thermal vias under the exposed die pad (if present), connect GND balls to a solid inner-plane ground, and avoid enclosing the device under shield cans without airflow. Layout directly impacts achievable output current and long-term reliability.