Texas Instruments LM2765M6X

Overview

LM2765M6X from Texas Instruments is a CMOS switched-capacitor voltage doubler IC that converts 1.8 V–5.5 V input to up to 2× V_IN output, delivering 20 mA with 90% typical efficiency and 20 Ω output impedance in a 6-pin SOT-23 package - used for powering op-amps, interface rails, and portable instrumentation.

For engineers reviewing the LM2765M6X datasheet, LM2765M6X pinout, LM2765M6X application, or LM2765M6X equivalent, key selection criteria include input voltage range (1.8–5.5 V), shutdown current (0.1 µA), switching frequency (50 kHz), output resistance (20 Ω @ 20 mA), and SOT-23-6 thermal performance (R_θJA = 185.2°C/W).

Technical Context

The LM2765M6X implements a four-switch charge-pump topology operating at 50 kHz nominal switching frequency (100 kHz oscillator frequency), using external flying and output capacitors to double the input supply without inductors. Its internal CMOS switches feature ~8 Ω total R_DS(on), enabling low-loss energy transfer.

Shutdown control is implemented via the SD pin, which disables oscillation and reduces quiescent current to 0.1 µA when pulled high (>40% of V₊). The device requires no external diode for steady-state operation but uses an external Schottky diode (e.g., 1N5817) only during startup to ensure reliable oscillator enablement.

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 voltage-doubling charge-pump applications.

Compared with MAX680ESA+ and TPS60205DGSR, the LM2765M6X offers the lowest shutdown current (0.1 µA), explicit shutdown control, and optimal balance of external component count, thermal performance (185.2°C/W), and 50 kHz EMI profile - making it ideal for long-life portable instrumentation and RF-adjacent subsystems.

Availability

LM2765M6X is available at Aetrix Electronics and suitable for cellular phone peripherals, handheld instruments, and operational amplifier power supplies requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for LM2765M6X 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 power management technologies with over 90 years of innovation in industrial, automotive, and consumer electronics.

The LM2765M6X belongs to TI's switched-capacitor DC-DC converter product line, designed specifically for compact, inductorless voltage multiplication in space-constrained, battery-powered applications where EMI sensitivity and ultra-low standby power are critical.

FAQ

What is the maximum continuous output current specification for the LM2765M6X?

The LM2765M6X is rated for 20 mA continuous output current under recommended operating conditions (1.8 V–5.5 V input, T_A ≤ 85°C). Absolute maximum output current is 40 mA, but sustained operation above 20 mA degrades efficiency, increases output impedance, and risks thermal overload without derating per R_θJA = 185.2°C/W. The LM2765M6X datasheet specifies 20 mA as the guaranteed performance limit for stable voltage doubling.

Does the LM2765M6X require an external diode in all operating conditions?

The LM2765M6X requires an external Schottky diode (e.g., 1N5817) only during startup to ensure reliable oscillator enablement when V_OUT is initially 0 V; once oscillation begins and V_OUT exceeds 1.8 V, the diode becomes inactive and carries no steady-state current. The LM2765M6X does not require the diode for normal operation - its internal circuitry handles continuous charge-pump cycling without it.

What is the recommended capacitor configuration for optimal efficiency in the LM2765M6X?

TI recommends two 3.3 µF, low-ESR ceramic capacitors: C1 (flying capacitor) between CAP+ and CAP−, and C2 (output capacitor) between OUT and GND. Capacitors must have ≤0.3 Ω ESR to maintain 90% typical efficiency and 20 Ω output impedance. Higher ESR increases output droop and ripple; the LM2765M6X electrical characteristics table explicitly ties ROUT and PEFF to this 3.3 µF / 0.3 Ω ESR condition.

Can multiple LM2765M6X devices be paralleled to increase output current capability?

Yes - multiple LM2765M6X devices can be paralleled to reduce composite output resistance. Each LM2765M6X must use its own dedicated flying capacitor (C1), while a single shared output capacitor (C2) suffices. The resulting output resistance is ROUT_composite = ROUT_{per LM2765M6X} / N, where N is the number of paralleled units. This technique is documented in Section 9.2.1.2.3 of the LM2765M6X datasheet and validated for up to three units in TI reference designs.

What is the thermal performance limitation of the LM2765M6X in a standard SOT-23-6 PCB layout?

In a standard 2-layer PCB layout with minimum copper pour, the LM2765M6X has a junction-to-ambient thermal resistance (R_θJA) of 185.2°C/W. At 25°C ambient and 20 mA load (≈100 mW dissipation), this results in ~18.5°C junction rise - well within the 100°C max junction rating. However, exceeding 600 mW power dissipation (e.g., high-current or high-temperature operation) requires enhanced copper area or thermal vias, as specified in the LM2765M6X layout guidelines.