Analog Devices Inc. LTC1693-2CS8#PBF

Overview

LTC1693-2CS8#PBF from Analog Devices (formerly Linear Technology) is a dual high-speed N-channel MOSFET driver in an 8-lead SOIC package, featuring one noninverting and one inverting output channel with 1 GΩ electrical isolation between grounds. It delivers 1.5 A peak output current, achieves 16 ns rise/fall times at V_CC = 12 V into 1 nF, operates across 4.5 V to 13.2 V supply range, and includes undervoltage lockout and thermal shutdown - used for isolated high/low-side gate drive in synchronous forward converters and telecom power supplies.

For engineers reviewing the LTC1693-2CS8#PBF datasheet, LTC1693-2CS8#PBF pinout, LTC1693-2CS8#PBF application, or LTC1693-2CS8#PBF equivalent, key selection criteria include confirmed dual-driver polarity configuration (topside noninverting / bottom-side inverting), validated 1 GΩ GND1–GND2 isolation, guaranteed 16 ns switching timing at 12 V/1 nF, and SO-8 package compatibility with industrial temperature range (0°C to 70°C).

Technical Context

The LTC1693-2 integrates two electrically isolated drivers: OUT1 is noninverting relative to IN1, while OUT2 is inverting relative to IN2 - enabling direct high-side and low-side MOSFET control without external level-shifting logic. Its input stage uses a 4 V internal regulator to maintain V_CC-independent CMOS thresholds (V_IL = 1.4 V, V_IH = 2.6 V) with 1.2 V hysteresis for noise immunity.

The output stage employs adaptive predriver logic with 6 ns nonoverlapping dead time to minimize cross-conduction, delivering 1.4 A high-side and 1.7 A low-side peak currents. Undervoltage lockout activates below 4 V, and thermal shutdown engages at 145°C with 20°C hysteresis - both disabling outputs and pulling them low.

Key Specifications

Pinout & Package

Package: 8-lead plastic SOIC (SO-8, narrow 0.150"), JEDEC MS-012, θ_JA = 135°C/W, rated for 0°C to 70°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-speed MOSFET driver applications.

Compared with LM5113MM/NOPB and UCC27531DR, the LTC1693-2CS8#PBF uniquely combines verified 1 GΩ inter-driver isolation, built-in inverting capability on OUT2, and V_CC-independent thresholds - making it irreplaceable in floating high-side, transformer-isolated, or bidirectional motor control where ground domain separation is mandatory.

Availability

LTC1693-2CS8#PBF is available at Aetrix Electronics and suitable for high/low-side drivers, telecom power supplies, motor/relay control, and charge pump circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC1693-2CS8#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 its precision analog and power management portfolio with rigorous reliability testing and automotive/industrial qualification.

The LTC1693 family was designed specifically for high-efficiency, high-density DC/DC conversion - targeting isolated forward, push-pull, and synchronous rectifier applications where dual-channel isolation, low quiescent current (360 µA), and nanosecond-level timing accuracy are essential.

FAQ

What is the exact output polarity configuration of the LTC1693-2CS8#PBF?

The LTC1693-2CS8#PBF has a fixed dual-output polarity: OUT1 is noninverting relative to IN1, and OUT2 is inverting relative to IN2. This configuration is intrinsic to the LTC1693-2 variant and cannot be changed via pins or external components. The LTC1693-2CS8#PBF datasheet confirms this behavior in the "PIN FUNCTIONS" section and block diagram, distinguishing it from the LTC1693-1 (dual noninverting) and LTC1693-3 (single with polarity-select pin).

Does the LTC1693-2CS8#PBF support operation with V_CC below 5 V?

Yes, the LTC1693-2CS8#PBF supports V_CC down to 4.5 V per Absolute Maximum Ratings and Electrical Characteristics tables. However, performance degrades below 5 V: rise/fall times increase, peak output current drops, and input thresholds remain valid but margin shrinks. For reliable 3.3 V logic interfacing, the LTC1693-2CS8#PBF remains functional at 4.5 V, but operation at 4.5 V should be validated with actual load and thermal conditions.

What is the maximum allowable differential voltage between GND1 and GND2 on the LTC1693-2CS8#PBF?

The LTC1693-2CS8#PBF specifies ±100 V maximum differential voltage between GND1 and GND2 per Absolute Maximum Ratings. This rating is supported by the 1 GΩ minimum isolation resistance measured at 75 V bias (ELECTRICAL CHARACTERISTICS table). Operation beyond ±100 V risks breakdown of internal isolation barriers and is not guaranteed. Applications requiring >100 V differential must use external isolation or alternative architectures.

Can the LTC1693-2CS8#PBF drive GaN HEMTs effectively?

The LTC1693-2CS8#PBF can drive enhancement-mode GaN HEMTs with gate thresholds ≤ 2.5 V and total gate charge < 10 nC, provided layout minimizes inductance and gate loop area. Its 1.5 A peak current and 16 ns timing meet requirements for sub-100 W GaN half-bridges. However, the LTC1693-2CS8#PBF lacks negative gate turn-off capability and fast desaturation detection - features found in dedicated GaN drivers - so it is best suited for lower-frequency (< 500 kHz), non-critical GaN applications.

How does the thermal shutdown of the LTC1693-2CS8#PBF behave during sustained overload?

The LTC1693-2CS8#PBF thermal shutdown activates at 145°C junction temperature and holds outputs low until junction temperature falls to ~125°C due to 20°C hysteresis. During sustained overload, this results in intermittent operation - cycling between drive enabled and disabled - preventing permanent damage but causing output dropout. To avoid this, PCB layout must ensure θ_JA ≤ 135°C/W and ambient temperature stays within 0°C to 70°C, especially under 1.5 A peak load at >200 kHz.