Texas Instruments LM2735XSD/NOPB

Overview

LM2735XSD/NOPB from Texas Instruments is a 1.6-MHz, 2.1-A low-side switch boost/SEPIC DC/DC regulator in a 6-pin WSON package, operating from 2.7 V to 5.5 V input and delivering up to 24 V output with ±2% feedback voltage accuracy, 170-mΩ NMOS switch R_DS(ON), and 80 nA shutdown current. It enables compact LCD backlight and USB-powered device power supplies.

For engineers reviewing the LM2735XSD/NOPB datasheet, LM2735XSD/NOPB pinout, LM2735XSD/NOPB application, or LM2735XSD/NOPB equivalent, key selection considerations include its fixed 1.6-MHz switching frequency, internal compensation, soft-start timing (4 ms), thermal shutdown (160°C), and compatibility with small SMD inductors and ceramic capacitors in space-constrained portable designs.

Technical Context

The LM2735XSD/NOPB implements constant-frequency peak current-mode control with internal compensation, enabling stable regulation across wide load and line variations without external loop components. Its architecture integrates a 170-mΩ NMOS power switch, precision 1.255-V reference, and cycle-by-cycle current limiting (2.1 A min) for robust transient response.

It supports both boost and SEPIC topologies via external component configuration, uses a logic-high enable pin for ultra-low 80-nA standby current, and features built-in soft start (4 ms ramp), undervoltage lockout (2.3 V rising), and thermal shutdown with 10°C hysteresis - all optimized for single-cell Li-ion and USB 5-V input systems.

Key Specifications

Pinout & Package

The LM2735XSD/NOPB is housed in a thermally enhanced 6-pin WSON (NGG) package measuring 3.00 mm × 3.00 mm, with exposed thermal pad (DAP) connected to PGND for improved power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost regulator applications.

Compared with LM2735YMF/NOPB and TPS61040DRVR, the LM2735XSD/NOPB offers the best balance of miniaturization (1.6-MHz operation), integrated protection (thermal shutdown, soft start), and precision regulation (±2% V_FB) for portable display and imaging power rails where PCB area and reliability are critical.

Availability

LM2735XSD/NOPB is available at Aetrix Electronics and suitable for LCD backlighting, USB-powered peripherals, and digital camera power management requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for LM2735XSD/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 designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer applications.

The LM2735XSD/NOPB belongs to TI's space-efficient DC/DC regulator product line, engineered specifically for portable electronics requiring high integration, minimal external components, and robust performance across battery-voltage ranges.

FAQ

What is the maximum output voltage supported by the LM2735XSD/NOPB?

The LM2735XSD/NOPB supports an output voltage range of 3 V to 24 V, set externally via the FB pin resistor divider. The internal 1.255-V reference and ±2% accuracy ensure stable regulation across this full range, validated for continuous operation up to 24 V with appropriate external components (e.g., 25-V-rated output capacitor and 20-V Schottky diode). This makes LM2735XSD/NOPB suitable for white LED strings and OLED panel bias rails.

Does the LM2735XSD/NOPB require external compensation components?

No, the LM2735XSD/NOPB features fully internal compensation, eliminating the need for external RC networks. Its current-mode control architecture and factory-tuned loop response allow stable operation with only five external components: input capacitor, output capacitor, inductor, catch diode, and FB divider. This simplifies layout and reduces BOM count - a key advantage confirmed in TI's LM2735XSD/NOPB reference designs and WEBENCH® Power Designer models.

What package type and thermal characteristics does the LM2735XSD/NOPB use?

The LM2735XSD/NOPB is packaged in a 6-pin WSON (NGG) case measuring 3.00 mm × 3.00 mm with an exposed thermal pad (DAP). Its junction-to-board thermal resistance (R_θJB) is 29.3°C/W, and it supports up to 400 mW of internal power dissipation under standard 4-layer PCB conditions. Proper thermal design requires ≥4 vias from the DAP to inner ground planes, as specified in the LM2735XSD/NOPB datasheet layout guidelines.

Can the LM2735XSD/NOPB operate in SEPIC topology?

Yes, the LM2735XSD/NOPB supports SEPIC configuration using two inductors (or a coupled inductor) and an AC-coupling capacitor, as documented in TI's LM2735XSD/NOPB application notes and typical circuits. Unlike basic boost converters, SEPIC provides non-inverting output with input-to-output isolation - critical for applications like USB-powered devices where output short-circuit must not backfeed the source. The LM2735XSD/NOPB's current-mode control and 2.1-A switch rating ensure stable SEPIC operation across its full input/output range.

What is the soft-start duration of the LM2735XSD/NOPB, and how is it implemented?

The LM2735XSD/NOPB features a fixed 4-ms soft-start period, during which the internal error amplifier reference ramps linearly from 0 V to its nominal 1.255 V. This controlled rise time limits inrush current into output capacitors and prevents output overshoot during power-up - especially important in LED backlight and camera flash applications. No external components are needed to configure or adjust this timing, as it is fully integrated and verified across temperature in the LM2735XSD/NOPB silicon design.