Analog Devices Inc. LTC1702ACGN#PBF

Overview

LTC1702ACGN#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous buck switching regulator controller optimized for high-efficiency, low-input-voltage DC/DC conversion in microprocessor and ASIC core/I/O power supplies. It integrates two independent voltage-mode PWM controllers operating at 550kHz, each driving external N-channel MOSFET pairs without current-sense resistors, delivering 1A–25A per channel with ±1% output regulation and <100µA shutdown current.

For engineers reviewing the LTC1702ACGN#PBF datasheet, LTC1702ACGN#PBF pinout, LTC1702ACGN#PBF application, or LTC1702ACGN#PBF equivalent, key selection considerations include its 24-pin narrow SSOP package, out-of-phase dual-phase operation minimizing input ripple, Burst Mode® for light-load efficiency, latched FAULT protection, and precise 0.8V internal reference enabling sub-1V outputs.

Technical Context

The LTC1702ACGN#PBF implements a constant-frequency, voltage-mode PWM architecture with independent feedback loops per channel, each featuring a 25MHz gain-bandwidth error amplifier and 0.8V trimmed reference (±0.5%). Its dual-phase interleaving-180° phase shift between channels-reduces input capacitor RMS current by ~48% versus single-phase operation, directly lowering EMI and thermal stress on input components.

Each channel uses floating gate drivers (TG/BG) powered via charge-pumped BOOST pins, eliminating need for external high-side driver ICs. Current limiting is achieved via V_DS-based sensing at SW pins, avoiding lossy sense resistors. The device transitions automatically from continuous conduction mode to discontinuous mode and then to Burst Mode® as load decreases, maintaining >85% efficiency down to 10mA load.

Key Specifications

Pinout & Package

Package: 24-pin narrow plastic SSOP (GN), 150-mil body width, 0.635mm lead pitch, exposed pad not present. Thermal resistance θ_JA = 100°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel synchronous buck controller applications.

Compared with ISL6522CRZ-T and TPS54620RGYT, the LTC1702ACGN#PBF delivers superior light-load efficiency via Burst Mode®, eliminates current-sense losses with V_DS sensing, and provides robust latched overvoltage protection-critical for protecting sensitive microprocessor cores in high-reliability systems.

Availability

LTC1702ACGN#PBF is available at Aetrix Electronics and suitable for microprocessor core supplies, ASIC I/O regulation, distributed power architectures, and 2-step regulation systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LTC1702ACGN#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and computing markets.

The LTC1702ACGN#PBF belongs to Linear's high-efficiency DC/DC controller product line, engineered specifically for low-input-voltage, high-current, multi-rail power delivery in performance-critical computing and embedded systems.

FAQ

What is the maximum input voltage rating for the LTC1702ACGN#PBF?

The LTC1702ACGN#PBF has an absolute maximum VCC and PVCC rating of 7V. The BOOST pins tolerate up to 15V, but the voltage difference between BOOSTn and SWn must not exceed 7V. Exceeding these ratings may cause permanent damage. For reliable operation, VIN should be maintained within 3V–7V, with 5V being the typical nominal supply.

Does the LTC1702ACGN#PBF require external current-sense resistors?

No, the LTC1702ACGN#PBF does not require external current-sense resistors. It implements V_DS-based current limiting by monitoring the voltage drop across the bottom N-channel MOSFET (QB) during conduction. The IMAX1 and IMAX2 pins set the current limit threshold using external resistors to PGND, eliminating power loss and board space associated with shunt resistors.

How does the LTC1702ACGN#PBF achieve 2-phase interleaved operation?

The LTC1702ACGN#PBF achieves true 2-phase interleaving by driving its two channels 180° out of phase using a shared oscillator. This causes the input current pulses from each channel to alternate, reducing the RMS input current by approximately 48% compared to in-phase operation. The result is lower EMI, smaller input capacitors, and improved thermal performance in the input stage.

What is the purpose of the FCB pin on the LTC1702ACGN#PBF?

FCB (Force Continuous Bar) on the LTC1702ACGN#PBF forces both channels into continuous conduction mode regardless of load. When the FCB pin voltage drops below 0.8V, Burst Mode® is disabled. This is useful for noise-sensitive applications where pulse-skipping artifacts must be avoided. Normally, FCB is tied to VCC to enable automatic Burst Mode® operation at light loads.

Can the LTC1702ACGN#PBF generate output voltages below 0.8V?

No, the LTC1702ACGN#PBF cannot generate output voltages below 0.8V because its internal reference is fixed at 0.8V ±0.5%. The feedback divider connects to this reference, so the minimum programmable output is 0.8V. For sub-0.8V outputs, an external reference or different controller architecture would be required.