Texas Instruments LM2664M6/NOPB

Overview

LM2664M6/NOPB from Texas Instruments is a CMOS switched-capacitor voltage inverter IC that converts 1.8 V to 5.5 V positive input into −1.8 V to −5.5 V negative output, delivers up to 40 mA output current, operates at 160-kHz oscillator frequency, and features 12-Ω typical output impedance - used in portable instrumentation and op-amp dual-supply generation.

For engineers reviewing the LM2664M6/NOPB datasheet, LM2664M6/NOPB pinout, LM2664M6/NOPB application, or LM2664M6/NOPB equivalent, key selection criteria include input voltage range compatibility, shutdown current (1 µA), output impedance impact on load regulation, and SOT-23-6 footprint constraints in space-constrained battery-powered designs.

Technical Context

The LM2664M6/NOPB implements a two-phase charge-pump topology using four internal CMOS switches driven by a 160-kHz oscillator; energy transfer relies on two external flying/output capacitors with low ESR to minimize output resistance and ripple. Its switching architecture avoids inductors and enables compact negative rail generation.

Shutdown mode is controlled via a dedicated SD pin requiring <0.8 V (≤20% of V+) to reduce quiescent current to 1 µA; normal operation requires SD tied to V+. Output voltage accuracy depends on internal switch R_DS(on) (typ. 4 Ω sum), capacitor ESR, and load current - not regulated open-loop.

Key Specifications

Pinout & Package

LM2664M6/NOPB is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm × 1.45 mm max height, with gull-wing leads and RoHS-compliant matte tin (Sn) lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage inverter applications.

Compared with MAX680ESA+ and ICL7660SIPAZ, LM2664M6/NOPB offers optimal balance of low quiescent current (220 µA), moderate output current (40 mA), and SOT-23-6 footprint - making it ideal for modern portable electronics where battery life and PCB area are primary constraints.

Availability

LM2664M6/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, operational amplifier power supplies, interface power supplies, and battery-powered instrumentation requiring stable component supply with consistent parametric performance across production lots.

Supply support for LM2664M6/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, specializing in analog, embedded processing, and digital signal technologies for industrial, automotive, and consumer markets.

The LM2664M6/NOPB belongs to TI's switched-capacitor DC/DC converter product line, engineered specifically for compact, inductorless negative voltage generation in space- and power-constrained portable electronics.

FAQ

What is the maximum continuous output current specification for LM2664M6/NOPB?

The LM2664M6/NOPB is rated for up to 40 mA of continuous output current under recommended operating conditions. At this load, output voltage droop is determined by its 12-Ω typical output resistance - resulting in ~480 mV drop from nominal −V_IN. Exceeding 40 mA risks thermal stress and reduced efficiency, though absolute maximum rating allows brief 50 mA peaks.

Does LM2664M6/NOPB require external components to operate, and if so, what are they?

Yes, LM2664M6/NOPB requires two external capacitors: a flying capacitor (C1) connected between CAP+ and CAP− pins, and an output capacitor (C2) between OUT and GND. TI recommends 3.3 µF low-ESR ceramic or OS-CON capacitors for optimal performance. No inductor or diode is needed - the charge-pump architecture eliminates magnetic components entirely.

Can LM2664M6/NOPB generate voltages outside the ±5.5 V range, such as −12 V from 5 V input?

No, LM2664M6/NOPB cannot generate −12 V from 5 V input in single-stage operation - its output magnitude is strictly limited to |−V_IN|. However, cascading two LM2664M6/NOPB units (as shown in Figure 13 of the datasheet) can produce −10 V from 5 V, though efficiency and output resistance degrade with each stage. For −12 V, a dedicated boost-inverter or transformer-based solution is required.

What is the shutdown behavior of LM2664M6/NOPB, and how is the SD pin interfaced?

The SD pin on LM2664M6/NOPB enables hardware-controlled shutdown: pulling SD ≤0.8 V (≤20% of V+) disables the oscillator and reduces supply current to 1 µA typical. During normal operation, SD must be tied directly to V+ - no resistor pull-up is needed. The pin has no internal pull-up, so floating SD may cause undefined operation or increased leakage.

Is LM2664M6/NOPB compatible with ceramic capacitors, and why does capacitor ESR matter?

Yes, LM2664M6/NOPB is fully compatible with ceramic capacitors - TI explicitly recommends 3.3 µF ceramic types in the datasheet. Capacitor ESR critically impacts performance: high ESR increases output resistance (ROUT ≈ R_SW + 4×ESR_C1 + ESR_C2) and output ripple. Low-ESR ceramics minimize both, enabling tighter load regulation and higher efficiency - especially vital at 40 mA output.