Texas Instruments LM2665M6X

Overview

LM2665M6X from Texas Instruments is a CMOS switched-capacitor voltage converter configured as a voltage doubler or voltage divider, operating from 2.5 V to 5.5 V input (doubler mode) or 1.8 V to 11 V (splitter mode), delivering up to 40 mA output current with 90% typical conversion efficiency and 12-Ω typical output impedance - used in portable instrumentation and interface power rails.

For engineers reviewing the LM2665M6X datasheet, LM2665M6X pinout, LM2665M6X application, or LM2665M6X equivalent, key selection criteria include its dual-mode operation (doubling/splitting), shutdown current of 1 µA, 160-kHz oscillator frequency, SOT-23-6 package compatibility, and suitability for low-noise, inductorless DC-DC conversion in space-constrained battery-powered systems.

Technical Context

The LM2665M6X implements a four-switch CMOS charge-pump topology with internal MOSFETs having 3.5 Ω typical R_DS(on) sum, operating at 160 kHz oscillator frequency (80 kHz switching frequency), enabling precise voltage doubling or halving without magnetic components. Its internal oscillator requires ≥1.8 V across OUT–GND to start, necessitating a Schottky diode (e.g., 1N5817) only during startup in doubler mode.

In voltage-splitter configuration, the device accepts up to 11 V input across OUT–GND (its internal oscillator rails), eliminating the need for a startup diode and allowing higher input voltage operation than in doubler mode - while maintaining identical shutdown control, thermal metrics (R_θJA = 210 °C/W), and SOT-23-6 pinout.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package, 2.90 mm × 1.60 mm body size, 1.45 mm max height, JEDEC MO-178 compliant, tape-and-reel packaging (3000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.

Compared with MAX680ESA+ and TPS60403DBVR, the LM2665M6X offers unique dual-mode flexibility and lowest shutdown current, making it optimal for battery-critical, multi-function portable systems requiring both voltage boosting and rail splitting on a single footprint.

Availability

LM2665M6X is available at Aetrix Electronics and suitable for portable medical sensors, handheld industrial radios, operational amplifier power supplies, interface power rails, and fire detection systems requiring stable component supply with long-term production continuity.

Supply support for LM2665M6X 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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs.

The LM2665 belongs to TI's switched-capacitor voltage converter product line, designed specifically for inductorless DC-DC conversion in space- and power-constrained portable electronics.

FAQ

What is the primary function of the LM2665M6X?

The LM2665M6X is a dual-mode CMOS switched-capacitor voltage converter that operates either as a voltage doubler (2.5 V–5.5 V input → up to 11 V output) or a voltage splitter (1.8 V–11 V input → half-voltage output). It delivers up to 40 mA with 90% typical efficiency and requires only two external capacitors and optionally a startup diode. The LM2665M6X integrates all switching MOSFETs and a 160-kHz oscillator in a SOT-23-6 package.

Does the LM2665M6X require an external inductor?

No, the LM2665M6X does not require an external inductor. It uses a charge-pump architecture with two external capacitors (C1 and C2) to transfer energy - eliminating magnetic components, reducing EMI, and minimizing PCB area. This makes the LM2665M6X ideal for compact, noise-sensitive applications like portable medical devices and handheld radios where inductors are undesirable.

What is the purpose of the SD pin on the LM2665M6X?

Pin 4 (SD) is the shutdown control input for the LM2665M6X. When pulled to GND, the device operates normally; when biased above 40% of V+, it enters shutdown mode, reducing supply current to 1 µA typical. This feature enables ultra-low-power standby in battery-powered systems. The LM2665M6X must be held in shutdown for full power gating - it does not support partial or dynamic control modes.

Can the LM2665M6X be used to generate negative voltage?

No, the LM2665M6X is not configured as an inverting charge pump and cannot generate negative output voltage. It operates exclusively in non-inverting modes: voltage doubling (positive output > input) or voltage splitting (positive output = input/2). For negative voltage generation, TI recommends alternatives such as the LM2776 or ICL7660S - the LM2665M6X lacks the internal switch topology required for inversion.

What are the key layout considerations for the LM2665M6X?

Optimal LM2665M6X layout requires placing CIN, COUT, and the flying capacitor C1 on the same PCB layer as the IC, with short, wide traces to minimize inductance. CIN must connect directly between V+ and GND pins; COUT between OUT and GND; and C1 between CAP+ and CAP−. All capacitor grounds must converge at a single point near the GND pin to prevent ground bounce. Avoid routing noisy signals under or adjacent to these high-dv/dt nodes to maintain efficiency and stability.