Analog Devices Inc. LTC3896EFE

Overview

LTC3896EFE from Analog Devices is a 4-quadrant, bidirectional synchronous DC/DC controller IC designed for bipolar power supplies that source and sink current across ±10 V output rails. It operates with a 12 V to 24 V intermediate bus input, supports 200 kHz fixed-frequency operation, delivers up to 3 A output current, and features dual-current-sense inputs (ISP/ISN) for precise bidirectional current regulation in automotive regenerative braking and precision audio amplifier biasing.

For engineers reviewing the LTC3896EFE datasheet, LTC3896EFE pinout, LTC3896EFE application, or LTC3896EFE equivalent, key selection criteria include its 4-quadrant control architecture, independent voltage and current regulation modes, integrated gate drivers for N- and P-channel MOSFETs, and cold-crank resilient operation down to 5 V input via companion boost stage.

Technical Context

The LTC3896EFE implements true 4-quadrant control by independently regulating output voltage using FB/CTRL feedback and output current using ISP/ISN differential sensing. Its dual-loop architecture enables seamless transition between sourcing (+10 V) and sinking (–10 V) modes without polarity reversal hardware.

It integrates high-side and low-side gate drivers with programmable dead time, supports external clock synchronization via SYNC pin, and uses internal 1.2 V reference with 0.6065 V offset for accurate current-sense threshold setting. The controller requires no external op-amps or comparators for bidirectional regulation.

Key Specifications

Pinout & Package

The LTC3896EFE is housed in a 28-pin 4 mm × 5 mm eTSSOP package with exposed pad for thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-quadrant controller applications.

Compared with LT8714 and TPS54A20, the LTC3896EFE uniquely integrates analog CTRL-to-VOUT linear mapping and dual differential current sense inputs-enabling plug-and-play bipolar operation without external signal conditioning or firmware-based mode switching.

Availability

LTC3896EFE is available at Aetrix Electronics and suitable for automotive regenerative braking systems, precision audio amplifier biasing, industrial test equipment, and active EMI compensation requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for LTC3896EFE 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The LTC3896EFE belongs to Analog Devices' Power by Linear™ 4-quadrant controller family, engineered specifically for bipolar, bidirectional power conversion in environments with unstable input conditions such as automotive cold-crank and industrial brownout scenarios.

FAQ

What is the primary function of the LTC3896EFE in a power system?

The LTC3896EFE is a 4-quadrant synchronous DC/DC controller that enables a single power stage to both source and sink current across a bipolar output rail (e.g., ±10 V). Unlike conventional controllers, it regulates both voltage polarity and current direction simultaneously-making it essential for applications like regenerative braking and precision audio biasing where power flow reverses dynamically. The LTC3896EFE achieves this without external op-amps or discrete logic, using dedicated ISP/ISN and CTRL/FB pins.

Can the LTC3896EFE operate directly from a 5 V to 24 V input rail?

No-the LTC3896EFE requires a stable 12 V to 24 V intermediate bus (V_INTER) and cannot accept 5 V–24 V directly. In practice, it is paired with a companion boost controller like the LTC7804 to maintain V_INTER ≥12 V during cold-crank dips. The LTC3896EFE itself regulates the final ±10 V output from that conditioned bus, ensuring uninterrupted bipolar operation even when system input drops to 5 V.

How does the CTRL pin on the LTC3896EFE determine output voltage polarity and magnitude?

The CTRL pin accepts a 0.1 V to 1.048 V analog input that linearly maps to –10 V to +10 V output: 0.1 V yields –10 V, 1.048 V yields +10 V, and 0.574 V yields 0 V. This mapping is implemented internally using a 0.6065 V reference offset and precision resistive scaling. The LTC3896EFE uses this signal to adjust duty cycle of TG/BG drivers in real time-enabling smooth transitions such as sine-wave generation without software intervention.

What is the role of the ISP and ISN pins on the LTC3896EFE?

The ISP and ISN pins form a differential current-sense input pair that measures bidirectional output current by detecting voltage drop across an external sense resistor (e.g., RS2 = 0.01 Ω). When current flows in either direction, the LTC3896EFE regulates its duty cycle to hold the ISP–ISN voltage at 50 mV-ensuring precise ±3 A current limiting. This capability is fundamental to the LTC3896EFE's ability to function as both a source and sink without changing external circuitry.

Does the LTC3896EFE support synchronization with external clock sources?

Yes-the LTC3896EFE includes a dedicated SYNC pin that accepts external TTL/CMOS clock signals to synchronize switching frequency. This feature allows multiple LTC3896EFE units to operate in phase for reduced input/output ripple, or enables alignment with system-level timing references in noise-sensitive applications like medical imaging or precision test equipment. The LTC3896EFE maintains regulation accuracy and transient response regardless of sync source stability.