Analog Devices Inc. DC2169A

Overview

DC2169A from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous monolithic step-down regulator IC designed for high-efficiency power conversion in space-constrained industrial and automotive systems. It delivers 1.5A on Channel 1 and 2.5A on Channel 2, operates from 3.4V to 42V input, achieves 6.5µA quiescent current in Burst Mode, and supports 200kHz–3MHz programmable switching frequency with 180° out-of-phase operation.

For engineers reviewing the DC2169A datasheet, DC2169A pinout, DC2169A application, or DC2169A equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping (28-lead TSSOP and 3mm × 6mm QFN), real-world application constraints, and two rigorously cross-checked alternative parts for design continuity.

Technical Context

The DC2169A integrates two independent peak-current-mode buck regulators sharing internal bias circuitry but featuring separate VIN, EN/UV, PG, TR/SS, FB, BOOST, and SW pins. Channel 1 supports up to 1.5A with 35ns minimum on-time and 310mΩ top-FET R_DS(on); Channel 2 supports up to 2.5A with 35ns minimum on-time and 145mΩ top-FET R_DS(on). Both channels use internal compensation and support soft-start, tracking, and ±10% power-good monitoring.

Operation modes include low-ripple Burst Mode (6.5µA IQ, both channels enabled), pulse-skipping mode (higher IQ, full-frequency regulation), and external clock synchronization (250kHz–3MHz). The SYNC/MODE pin selects mode via voltage level or clock signal, while BIAS pin sourcing reduces VIN1 loading when V_OUT ≥ 3.3V.

Key Specifications

Pinout & Package

The DC2169A is available in two thermally enhanced packages: 28-lead plastic TSSOP (FE) and 28-lead 3mm × 6mm plastic QFN (UDE). Both feature exposed GND pads soldered to PCB for optimal thermal performance. Pin numbering and functions are identical across packages per datasheet Figure 1 (FE) and Figure 2 (UDE).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3375 and TPS54560B, the DC2169A uniquely combines 42V input tolerance, true dual-channel independence (separate VIN/EN/PG), ultralow 6.5µA IQ, and integrated soft-start/tracking-making it optimal for compact, battery-backed, high-reliability dual-rail systems where input voltage range and power sequencing are critical.

Availability

DC2169A is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, and medical point-of-care monitors requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for DC2169A 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The DC2169A belongs to ADI's Power by Linear™ portfolio of high-efficiency, high-reliability DC/DC converters engineered for demanding applications where input voltage range, quiescent current, and thermal performance are critical design constraints.

FAQ

What is the maximum input voltage rating for DC2169A?

The DC2169A has an absolute maximum input voltage rating of 42V on VIN1 and VIN2 pins. This allows direct connection to 24V and 36V industrial or automotive battery systems, including handling of transient load-dump events up to 40V. Operation above 42V risks permanent damage per Absolute Maximum Ratings table.

Does DC2169A support independent enable and power-good signaling per channel?

Yes, DC2169A provides fully independent EN/UV1 and EN/UV2 pins with 1.03V rising/0.98V falling thresholds, and open-drain PG1 and PG2 outputs that assert low when their respective output deviates more than ±10% from regulation. This enables precise per-rail sequencing, fault isolation, and system-level power management without external logic.

How does the BIAS pin improve efficiency in DC2169A designs?

The BIAS pin on DC2169A reduces input current draw from VIN1 by supplying internal gate drivers and control circuits when biased ≥3.1V-typically from VOUT1 or VOUT2 (≥3.3V). This lowers thermal stress on VIN1, improves light-load efficiency, and enables higher overall system efficiency, especially when one output is ≥3.3V and can power the internal regulator.

Can DC2169A operate with only one channel enabled?

Yes, DC2169A supports single-channel operation: pull EN/UV2 low to disable Channel 2 while keeping Channel 1 active, or vice versa. However, VIN1 must remain ≥3.4V even when only Channel 2 is used, as it powers shared internal bias circuitry. Disabling both channels reduces IQ to 1.7µA.

What package options are available for DC2169A and how do they differ thermally?

DC2169A is offered in 28-lead TSSOP (FE) and 28-lead 3mm × 6mm QFN (UDE). The QFN has θ_JA = 40°C/W and θ_JC(PAD) = 5°C/W; the TSSOP has θ_JA = 30°C/W and θ_JC(PAD) = 10°C/W. While TSSOP offers slightly better board-level convection cooling, QFN provides superior junction-to-pad thermal resistance-critical for high-power-density layouts with internal copper planes.