Texas Instruments LM2665M6/NOPB

Overview

LM2665M6/NOPB from Texas Instruments is a CMOS switched-capacitor voltage converter operating as either a voltage doubler (2.5 V–5.5 V input → up to 11 V output) or precision voltage divider (1.8 V–11 V input → half-voltage output), delivering up to 40 mA with 90% typical conversion efficiency and 12-Ω output impedance - used in portable instrumentation, interface power rails, and low-power op-amp supplies.

For engineers reviewing the LM2665M6/NOPB datasheet, LM2665M6/NOPB pinout, LM2665M6/NOPB application, or LM2665M6/NOPB equivalent, key selection criteria include its dual-mode operation (doubler/splitter), 160-kHz oscillator frequency, shutdown current of 1 µA, SOT-23-6 package compatibility, and absence of inductor requirements for compact DC-DC solutions.

Technical Context

The LM2665M6/NOPB integrates four large CMOS switches controlled by an internal 160-kHz oscillator to implement charge-pump voltage doubling or halving. Its functional modes are determined solely by external pin interconnection - no mode-select pins or configuration registers exist.

It operates without magnetic components: energy transfer relies on two external 3.3-µF capacitors and (in doubler mode only) a start-up Schottky diode. Output regulation is unregulated - output voltage varies linearly with load due to fixed 12-Ω typical output resistance and MOSFET R_DS(on) summation.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 1.45 mm max height, JEDEC MO-178 compliant, tape-and-reel (1000 pcs/reel), RoHS-compliant matte tin lead finish, MSL Level-1.

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 LM2665M6/NOPB uniquely balances dual-mode flexibility, ultra-low shutdown current, and minimal external component count - making it optimal for cost-sensitive, space-constrained, and battery-life-critical designs where regulated output is unnecessary.

Availability

LM2665M6/NOPB is available at Aetrix Electronics and suitable for portable medical devices, handheld test instruments, industrial wireless sensors, and low-power interface supplies requiring stable component supply across long-lifecycle production programs.

Supply support for LM2665M6/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, designing and manufacturing analog and embedded processing chips for industrial, automotive, and personal electronics markets.

The LM2665M6/NOPB belongs to TI's legacy switched-capacitor converter family, engineered specifically for low-noise, inductor-free DC-DC conversion in battery-powered portable equipment where size, cost, and quiescent power are primary constraints.

FAQ

What is the maximum input voltage the LM2665M6/NOPB can handle in voltage-splitter mode?

The LM2665M6/NOPB supports input voltages from 1.8 V to 11 V in voltage-splitter mode. This range is enabled because the internal oscillator operates from the OUT–GND rails, and the off-voltage across each internal switch equals half the input voltage - allowing safe operation up to 11 V without exceeding device breakdown limits. The LM2665M6/NOPB datasheet specifies absolute maximum OUT-to-GND voltage as 11.6 V, confirming this rating.

Does the LM2665M6/NOPB require an external diode in all configurations?

No - the LM2665M6/NOPB requires an external Schottky diode (e.g., 1N5817) only in voltage-doubler mode for startup. The diode charges the OUT pin to ≥1.8 V to initialize the internal oscillator. In voltage-splitter mode, the oscillator is powered directly from the OUT–GND rails, eliminating the need for any external diode. This reduces BOM count and improves reliability in halving applications.

Can multiple LM2665M6/NOPB devices be paralleled to increase output current?

Yes - the LM2665M6/NOPB supports paralleling to reduce effective output resistance and increase total output current capability. Each LM2665M6/NOPB must use its own flying capacitor (C1), while a single shared output capacitor (C2) suffices. The composite output resistance follows R_{OUT_total} = R_OUT/N, where N is the number of paralleled devices - enabling scalable current delivery without redesigning the core circuit.

What is the purpose of the SD pin on the LM2665M6/NOPB, and how is it controlled?

SD is the shutdown control pin of the LM2665M6/NOPB. When pulled to GND, the device operates normally; when biased above 40% of V+, it enters shutdown mode with 1-µA typical supply current. No pull-up or external logic is required - direct grounding suffices for always-on operation. The LM2665M6/NOPB does not invert logic: SD = low → active, SD = high → shutdown.

Is the LM2665M6/NOPB suitable for powering precision analog circuits?

The LM2665M6/NOPB delivers unregulated output with 12-Ω typical output impedance, causing voltage droop under load - limiting its use in precision analog circuits unless post-regulated. However, in voltage-splitter mode, it achieves excellent ratio accuracy (±0.2%) due to matched internal switch characteristics, making it suitable for ratiometric references or buffered mid-rail generation. For true precision, pair the LM2665M6/NOPB with a low-dropout linear regulator.