Analog Devices Inc. LTC2923IMS#TRPBF

Overview

LTC2923IMS#TRPBF from Analog Devices (formerly Linear Technology) is a precision power supply tracking and sequencing controller IC designed for multi-rail systems. It controls two slave DC/DC supplies via feedback node current injection (±1mA FBx/ TRACKx matching), supports optional third-supply control using an external N-channel FET, provides 10µA programmable ramp current, and features electronic circuit breaker protection with 200mV V_DS fault threshold. It is used in FPGA, microprocessor, and server power-up sequencing where voltage offset, ratiometric, or coincident ramp profiles are required.

For engineers reviewing the LTC2923IMS#TRPBF datasheet, LTC2923IMS#TRPBF pinout, LTC2923IMS#TRPBF application, or LTC2923IMS#TRPBF equivalent, key selection criteria include its dual-tracking capability without series pass losses, open-loop architecture preserving supply stability, 10-lead MSOP package compatibility, and support for both FET-based master ramping and direct GATE–RAMP tie configurations.

Technical Context

The LTC2923IMS#TRPBF implements a wide-range current-mirror-based tracking cell that servo-controls TRACK1/TRACK2 at 0.8V and mirrors current into FB1/FB2 to force slave outputs to track a master signal-either from an external FET's source (RAMP pin) or from a capacitor charged/discharged by the internal 10µA GATE current source. Its open-loop control ensures no impact on transient response or loop stability of regulated supplies.

It integrates fault detection logic including short-circuit latching (V_CC – RAMP > 200mV for >10µs), ON-pin hysteresis (75mV), and undervoltage lockout (2.5V threshold with 25mV hysteresis). The RAMPBUF pin delivers up to 2mA buffered drive for TRACK resistive dividers, decoupling them from RAMP node impedance effects during FET-based operation.

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (MS package), 3mm × 3mm body, exposed pad (optional GND connection), θ_JA = 120°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power supply tracking controller applications.

Compared with TSM103WIDT and TPS652860RSLR, the LTC2923IMS#TRPBF uniquely combines dual analog tracking, external FET master control, and hardware fault protection in a single 10-lead IC-enabling retrofit sequencing into existing multi-vendor power architectures without layout redesign.

Availability

LTC2923IMS#TRPBF is available at Aetrix Electronics and suitable for FPGA power sequencing, microprocessor VCORE/VI/O tracking, and server PSU coordination requiring stable component supply, long-term lifecycle assurance, and industrial-grade temperature performance.

Supply support for LTC2923IMS#TRPBF 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 semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC2923IMS#TRPBF belongs to ADI's precision power management portfolio, designed specifically for analog-controlled power supply tracking and sequencing in systems where digital PMICs lack flexibility or compatibility with legacy DC/DC converters.

FAQ

What is the primary function of the LTC2923IMS#TRPBF in a power system?

The LTC2923IMS#TRPBF is a dedicated analog power supply tracking and sequencing controller. It enables two slave DC/DC supplies to ramp up/down in precise relationship-coincident, offset, or ratiometric-to a master signal, either generated by an external FET or by charging a capacitor via its GATE pin. Its open-loop current-mirror architecture avoids insertion loss and preserves supply stability, making it ideal for FPGA, microprocessor, and server applications where rail coordination is critical.

How does the LTC2923IMS#TRPBF maintain supply stability during tracking?

The LTC2923IMS#TRPBF maintains supply stability by using open-loop current injection into the feedback nodes of slave regulators-no pass elements or closed-loop control are introduced. Because it does not alter the DC/DC converter's feedback path impedance or phase margin, the transient response, bandwidth, and loop stability of each supply remain unchanged. This is confirmed in the datasheet: "the LTC2923 does not affect the transient response or stability of the supplies."

Can the LTC2923IMS#TRPBF control three independent power supplies?

Yes-the LTC2923IMS#TRPBF directly controls two slave supplies via FB1/FB2 and TRACK1/TRACK2, and supports a third supply using an external N-channel FET driven by its GATE pin, with the FET's source connected to the RAMP pin. This configuration allows sequencing of supplies where feedback access is unavailable (e.g., power modules) or where grounding constraints exist (e.g., 3-terminal linear regulators).

What protection features does the LTC2923IMS#TRPBF provide against output faults?

The LTC2923IMS#TRPBF includes an integrated electronic circuit breaker that monitors V_CC – V_RAMP. If this voltage exceeds 200mV for more than ~10µs-indicating a shorted FET output-the device immediately pulls GATE low with 20mA, disabling the master rail. The fault remains latched until the ON pin is pulled below 0.4V to clear the condition, preventing automatic recovery into a sustained fault.

Is the LTC2923IMS#TRPBF pin-compatible with other members of the LTC292x family?

No-the LTC2923IMS#TRPBF is not pin-compatible with LTC2921 or LTC2922. While functionally related, the LTC2923 has unique pin assignments including dedicated RAMPBUF, STATUS (DFN only), and SDO (DFN only) pins not present on earlier variants. The MSOP-10 footprint is shared, but signal mapping differs; PCB layout must be verified against the LTC2923IMS#TRPBF-specific pinout diagram.