Analog Devices Inc. LTC1693-3CMS8#PBF

Overview

LTC1693-3CMS8#PBF from Analog Devices (formerly Linear Technology) is a single-channel, high-speed N-channel MOSFET driver with output polarity select functionality in an 8-lead MSOP package. It delivers 1.4A high-side and 1.7A low-side peak output current, achieves 17.5ns typical rise/fall time into 1nF at 12V VCC, operates across 4.5V–13.2V supply range, and features VCC-independent CMOS inputs with 1.2V hysteresis - enabling robust gate drive in isolated DC/DC converters and synchronous boost topologies.

For engineers reviewing the LTC1693-3CMS8#PBF datasheet, LTC1693-3CMS8#PBF pinout, LTC1693-3CMS8#PBF application, or LTC1693-3CMS8#PBF equivalent, key selection criteria include its PHASE pin-controlled inverting/noninverting output behavior, thermal shutdown (145°C trip), undervoltage lockout (<4V disable), rail-to-rail CMOS-compatible drive, and suitability for high-frequency switching in charge pump and forward converter designs.

Technical Context

The LTC1693-3CMS8#PBF implements a dual-MOSFET CMOS output stage (P1/N1) with adaptive nonoverlapping 6ns dead-time control to minimize cross-conduction. Its input stage uses a 4V internal regulator to decouple VIH/VIL thresholds (2.6V/1.4V typ) from VCC variation, ensuring noise-immune logic-level interfacing even with 3V or 5V controllers.

Unlike the dual-driver LTC1693-1/-2, this variant integrates a dedicated PHASE pin (Pin 3) that selects output polarity: grounded for inverting operation (typical pull-down current 20µA), or tied to VCC/floating for noninverting mode. Its single-output architecture eliminates inter-driver isolation requirements while retaining all protection features - UVLO, thermal shutdown, and rail-to-rail drive capability.

Key Specifications

Pinout & Package

Package: 8-lead MSOP (3.0mm × 3.0mm × 0.86mm height), moisture sensitivity level 1, RoHS-compliant, rated for –40°C to 85°C operating ambient temperature.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar MOSFET driver applications.

Compared with LM5112MMX/NOPB and TPS28225DR, the LTC1693-3CMS8#PBF uniquely combines polarity-select flexibility, VCC-independent thresholds, and 1.2V hysteresis - making it the only option among the three that eliminates need for external logic or level shifters in dual-mode gate drive applications.

Availability

LTC1693-3CMS8#PBF is available at Aetrix Electronics and suitable for isolated DC/DC converters, synchronous boost regulators, charge pump inverters, and high-side motor drivers requiring stable component supply across industrial, telecom, and embedded power design cycles.

Supply support for LTC1693-3CMS8#PBF 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

Analog Devices acquired Linear Technology in 2017 and maintains full product support, datasheet archives, and application engineering for legacy Linear parts including the LTC1693 family.

The LTC1693 product line was designed specifically for high-efficiency, high-frequency power conversion - targeting isolated forward, boost, and charge pump topologies where fast, robust, low-quiescent gate drive is essential.

FAQ

What is the function of the PHASE pin on the LTC1693-3CMS8#PBF?

The PHASE pin (Pin 3) on the LTC1693-3CMS8#PBF determines output polarity: grounding it configures the driver for inverting operation (OUT = NOT IN), while connecting it to VCC or leaving it floating selects noninverting mode (OUT = IN). Its 4.5–6.5V high threshold and 20µA sink current when low allow direct interface with standard logic outputs without external components - a key differentiator from fixed-function drivers like the TPS28225DR.

Does the LTC1693-3CMS8#PBF support 3.3V logic input levels?

Yes, the LTC1693-3CMS8#PBF supports 3.3V logic inputs directly due to its VCC-independent input thresholds (VIH = 2.6V typ, VIL = 1.4V typ) and 1.2V hysteresis. These values remain stable across the full 4.5–13.2V VCC range, eliminating the need for level-shifting circuitry when interfacing with 3.3V microcontrollers or FPGA I/O - unlike the LM5112MMX/NOPB, which requires external translation for sub-5V logic.

What is the maximum capacitive load the LTC1693-3CMS8#PBF can drive while maintaining specified rise/fall times?

The LTC1693-3CMS8#PBF is characterized for rise/fall times of 17.5ns/16.5ns (typ) into 1nF at VCC = 12V. At 4.7nF, timing degrades to 48ns/42ns (typ). For loads exceeding 4.7nF - such as paralleled MOSFETs with total Ciss > 3nF - external gate resistors or driver staging should be used to maintain stability and prevent ringing, as confirmed by the AC timing test circuits in the official datasheet.

How does the undervoltage lockout (UVLO) behave on the LTC1693-3CMS8#PBF?

The LTC1693-3CMS8#PBF disables its output and pulls OUT low when VCC drops below 4V. The output remains inactive between VCC = 1V and 4V, then resumes normal operation once VCC exceeds 4.2V (typ). This hysteresis prevents oscillation during power-up or brownout events - a critical safeguard in telecom power supplies where input voltage sag can cause shoot-through in half-bridge configurations driven by the LTC1693-3CMS8#PBF.

Can the LTC1693-3CMS8#PBF be used in high-side floating configurations?

No - the LTC1693-3CMS8#PBF is a single-output, ground-referenced driver and cannot operate in true high-side floating configurations (e.g., bootstrapped or isolated gate drive). That capability is exclusive to the dual-driver variants LTC1693-1CS8 and LTC1693-2CS8, which provide 1GΩ isolation between GND1/GND2. For high-side applications requiring floating operation, the LTC1693-3CMS8#PBF must be paired with an isolated DC/DC bias supply or replaced with a dedicated high-side driver like the ADP3623.