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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. LTC3823EGN#TRPBF

Name: LTC3823EGN#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3823EGN#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3823EGN#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 28-SSOP (0.154", 3.90mm Width)

Datasheet:: LTC3823EGN#TRPBF.pdf

Description:: IC REG CTRLR BUCK 28SSOP

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Product details

Overview

LTC3823EGN#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller with true remote differential output sensing, output voltage tracking, and PLL synchronization. It delivers 0.6V to 3.3V outputs (with remote sense) from 4.5V–36V input, supports ≤100ns minimum on-time, and enables high-efficiency power delivery in server and ASIC supply rails.

For engineers reviewing the LTC3823EGN#TRPBF datasheet, LTC3823EGN#TRPBF pinout, LTC3823EGN#TRPBF application, or LTC3823EGN#TRPBF equivalent, key selection criteria include its valley current mode control without R_SENSE, ±0.67% reference accuracy, programmable current limit, differential remote sensing architecture, and 28-lead SSOP narrow package compatibility.

Technical Context

The LTC3823EGN#TRPBF implements constant on-time, valley current mode control with an internal 5V INTVCC regulator and dual N-channel MOSFET drivers capable of 4A peak gate drive. Its error amplifier transconductance is 1.65mS, and it features a dedicated differential sensing amplifier (gain = 0.9965–1.0035 V/V, 3.5MHz GBW) for precise remote voltage regulation.

Phase-locked loop synchronization accepts external clocks via PLLIN (50kΩ input resistance), while the RUN pin enables micropower shutdown (30μA). Fault protection includes overvoltage detection (±11% PGOOD threshold), input UVLO (3.1V–4.1V hysteresis), and adjustable cycle-by-cycle current limiting via VRNG and ITH pins.

Key Specifications

Parameter	Value and Actual Design Meaning
VIN Range	4.5V to 36V - supports wide-input industrial and server supplies without pre-regulation.
Reference Voltage	0.6V ±0.67% - enables accurate low-voltage regulation for modern ASICs and memory.
Min On-Time	<100ns - allows high step-down ratios (e.g., 24V→1.2V at 500kHz) without duty cycle limitation.
Duty Cycle Range	2% to 90% at 200kHz - accommodates both high- and low-duty applications across input/output combinations.
Remote Sensing Gain	0.9965–1.0035 V/V - ensures ≤0.35% gain error in differential feedback path for tight load regulation.
PGOOD Threshold	±11% hysteresis around VFB - provides robust output monitoring with built-in 20μs fault mask timer.
Shutdown Current	30μA - enables low-power system standby modes without auxiliary regulators.

Pinout & Package

Package: 28-Lead Plastic SSOP Narrow (GN), 5.3mm × 10.2mm body, 0.635mm pitch, exposed thermal pad not present (unlike QFN UH variant).

Pin	Circuit Role	Design Meaning
FCB	Forced Continuous Mode Control	Ground → forces continuous conduction at light loads; INTVCC → enables discontinuous mode for efficiency optimization.
RUN	Enable/Shutdown Input	Threshold at 1.5V rising edge - provides clean, noise-immune startup sequencing with hysteresis.
VON	On-Time Proportionality Input	Clamped 0.6V–4.8V - ties t_ON to V_OUT for frequency stability during output voltage changes.
PGOOD	Open-Drain Power Good Output	Active-low signal tracking VFB ±11% - used for system-level power sequencing and fault reporting.
TRACK/SS	Tracking & Soft-Start Control	Internal 1.7μA current source charges external capacitor - enables synchronized multi-rail startup or master-slave voltage tracking.
VRNG	Sense Voltage Range Selection	0.5V–2V input sets nominal current sense threshold (50mV–200mV) - configures current limit scaling without resistor changes.
SENSE+, SENSE−	Current Sense Comparator Inputs	Kelvin-connected to MOSFET source or sense resistor - enables R_SENSE-less operation using bottom FET R_DS(ON).
VOUTSENSE+, VOUTSENSE−	Differential Remote Sense Inputs	Direct connection to load terminals - eliminates IR drop errors in high-current PCB traces.

Key Features

Feature	Design Value
No R_SENSE Operation	Uses bottom MOSFET R_DS(ON) as current sense element - eliminates sense resistor losses and BOM cost in high-current designs.
Differential Remote Sensing	Integrated 0.9965–1.0035 gain amplifier with 2mV offset - maintains ±0.5% output regulation accuracy under 100mΩ trace resistance.
Output Voltage Tracking	TRACK/SS pin accepts master rail's VFB divider - enables precise sequencing of multiple supplies (e.g., core + I/O) without external circuitry.
PLL Synchronization	Accepts external clock up to 1MHz via PLLIN - eliminates beat frequencies in multi-phase or noise-sensitive systems.
Adjustable Current Limit	VRNG pin scales sense threshold from 50mV to 200mV - allows fine-tuned overcurrent protection matching MOSFET SOA.

Applications

Server CPU Core Supply	ASIC Power Rail
Use Scenario: Regulating 1.2V/60A core voltage for x86 processors with tight transient response requirements. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing top/bottom N-MOSFETs, remote sensing at CPU socket, and tracking auxiliary rails. Use Value: 0.6V reference ±0.67% and <100ns min on-time enable stable 1.2V generation from 12V intermediate bus with <1% load regulation error.	Use Scenario: Powering FPGA or SoC logic rails requiring coordinated startup with I/O and memory supplies. IC Role / Device Role / Timing Role: Master controller using TRACK/SS to drive slave converters, with PLLIN synchronized to system clock for EMI reduction. Use Value: Differential sensing compensates for 50mΩ PCB resistance between converter and FPGA VCCINT pin, maintaining ±5mV accuracy at full load.
High-Density Telecom PSU	Industrial PLC Power Module
Use Scenario: Generating 3.3V/20A from 48V backplane in space-constrained telecom line cards. IC Role / Device Role / Timing Role: Step-down controller operating at 300kHz with external frequency sync to avoid interference with data lanes. Use Value: 4.5V–36V input range covers derated 48V systems; 30μA shutdown current extends standby battery life in backup modules.	Use Scenario: Providing isolated 2.5V/15A supply for real-time control microcontrollers in harsh environments. IC Role / Device Role / Timing Role: Robust controller with UVLO (3.1V–4.1V), thermal shutdown (170°C), and current foldback protecting against short-circuit faults. Use Value: Adjustable VRNG-based current limit prevents MOSFET thermal runaway during sustained overload conditions common in motor drive interfaces.

Server CPU Core Supply

ASIC Power Rail

Use Scenario: Regulating 1.2V/60A core voltage for x86 processors with tight transient response requirements.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing top/bottom N-MOSFETs, remote sensing at CPU socket, and tracking auxiliary rails.

Use Value: 0.6V reference ±0.67% and <100ns min on-time enable stable 1.2V generation from 12V intermediate bus with <1% load regulation error.

Use Scenario: Powering FPGA or SoC logic rails requiring coordinated startup with I/O and memory supplies.

IC Role / Device Role / Timing Role: Master controller using TRACK/SS to drive slave converters, with PLLIN synchronized to system clock for EMI reduction.

Use Value: Differential sensing compensates for 50mΩ PCB resistance between converter and FPGA VCCINT pin, maintaining ±5mV accuracy at full load.

High-Density Telecom PSU

Industrial PLC Power Module

Use Scenario: Generating 3.3V/20A from 48V backplane in space-constrained telecom line cards.

IC Role / Device Role / Timing Role: Step-down controller operating at 300kHz with external frequency sync to avoid interference with data lanes.

Use Value: 4.5V–36V input range covers derated 48V systems; 30μA shutdown current extends standby battery life in backup modules.

Use Scenario: Providing isolated 2.5V/15A supply for real-time control microcontrollers in harsh environments.

IC Role / Device Role / Timing Role: Robust controller with UVLO (3.1V–4.1V), thermal shutdown (170°C), and current foldback protecting against short-circuit faults.

Use Value: Adjustable VRNG-based current limit prevents MOSFET thermal runaway during sustained overload conditions common in motor drive interfaces.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC3855IGN#TRPBF	Higher integration: integrated 5V LDO for gate drive, dual-output capability, 0.5% reference accuracy.	Supports dual independent outputs with interleaving; lacks PLL sync but adds current sharing.	Select when needing dual-rail generation or tighter reference tolerance; requires different layout due to integrated LDO.
MP2918GL-Z	Lower quiescent current (15μA), no remote sensing, fixed 0.6V reference, 40V max VIN.	Optimized for cost-sensitive industrial SMPS; no tracking or PLL sync; uses single-ended feedback only.	Select for simpler, lower-cost designs where remote sensing and rail coordination are unnecessary.

Compared with LTC3823EGN#TRPBF, LTC3855IGN#TRPBF offers higher precision and dual-output flexibility at the cost of added complexity and loss of PLL synchronization, while MP2918GL-Z trades advanced features for reduced BOM count and lower standby power in non-critical applications.

Availability

LTC3823EGN#TRPBF is available at Aetrix Electronics and suitable for server power supplies, ASIC core rails, and distributed telecom systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LTC3823EGN#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all Linear-branded ICs including the LTC3823 series.

The LTC3823 belongs to Linear's high-performance synchronous buck controller family, designed specifically for demanding digital power applications in servers, networking equipment, and high-end computing where precision regulation, fast transient response, and multi-rail coordination are critical.

FAQ

What is the minimum recommended input voltage for reliable operation of the LTC3823EGN#TRPBF?

The LTC3823EGN#TRPBF has a guaranteed operating input voltage range of 4.5V to 36V. Below 4.5V, internal biasing and gate drive may become unstable; the undervoltage lockout activates at VIN falling below 3.1V (typical), preventing erroneous switching. For designs requiring sub-4.5V operation, the LTC3855 or LTC3892 families offer extended low-VIN capability.

Does the LTC3823EGN#TRPBF require an external sense resistor for current limiting?

No, the LTC3823EGN#TRPBF supports R_SENSE-less operation by using the bottom N-channel MOSFET's R_DS(ON) as the current sense element-connect SENSE+ to SW and SENSE− to PGND. A sense resistor is optional and used only when precise, temperature-stable current limiting is required beyond MOSFET R_DS(ON) variation.

How does the TRACK/SS pin function in master-slave configurations with the LTC3823EGN#TRPBF?

In master-slave setups, the LTC3823EGN#TRPBF's TRACK/SS pin accepts a resistive divider from the master rail's VFB node. During soft-start, the internal 1.7μA current source charges the external capacitor, causing the slave output to ramp in precise proportion to the master. This ensures monotonic, glitch-free power-up of interdependent rails like CPU core and I/O voltages.

What is the purpose of the VRNG pin on the LTC3823EGN#TRPBF, and how does it affect current limit programming?

The VRNG pin on the LTC3823EGN#TRPBF sets the nominal current sense threshold: 0.5V → 50mV, 2.0V → 200mV, or INTVCC → 200mV. This directly scales the maximum allowable valley current (I_OUT(MAX) ≈ 0.133×VRNG/R_SENSE). It enables flexible current limit adjustment without changing R_SENSE, accommodating MOSFET R_DS(ON) drift or design margin changes.

Can the LTC3823EGN#TRPBF be synchronized to an external clock, and what are the electrical requirements for PLLIN?

Yes, the LTC3823EGN#TRPBF supports PLL synchronization via the PLLIN pin, which has a 50kΩ internal pull-down to SGND. The external clock must be AC-coupled or level-shifted to stay within –0.3V to (INTVCC + 0.3)V. Frequency range is DC to 1MHz; phase alignment is achieved automatically, and PLLFLTR sets loop filter characteristics with a default 1.180V bias when unsynchronized.

LTC3823EGN#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 28-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 4.5V ~ 36V

Frequency - Switching:: -

Duty Cycle (Max):: 90%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Enable, On Time Control, Power Good, Soft Start, Tracking

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SSOP

LTC3823EGN#TRPBF FAQ

1.How can I place an order for LTC3823EGN#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3823EGN#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LTC3823EGN#TRPBF reliable?

The price and inventory of LTC3823EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3823EGN#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC3823EGN#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3823EGN#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3823EGN#TRPBF?

LTC3823EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3823EGN#TRPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LTC3823EGN#TRPBF?

For technical support, including LTC3823EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3823EGN#TRPBF requirements.

6.How does Aetrix verify that LTC3823EGN#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC3823EGN#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3823EGN#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC3823EGN#TRPBF?

All LTC3823EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3823EGN#TRPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LTC3823EGN#TRPBF part is unused and in its original packaging.

Return procedure for LTC3823EGN#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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