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

Analog Devices Inc. LTC1709EG-9#TRPBF

Name: LTC1709EG-9#TRPBF
Brand: Analog Devices Inc.
SKU: LTC1709EG-9#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC1709EG-9#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 36-SSOP (0.209", 5.30mm Width)

Datasheet:: LTC1709EG-9#TRPBF.pdf

Description:: IC REG CTRLR BUCK 36SSOP

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Product details

Overview

LTC1709EG-9#TRPBF from Analog Devices (formerly Linear Technology) is a 2-phase, VRM9.0-compliant, synchronous step-down switching regulator controller driving two external N-channel MOSFET stages. It operates at 150kHz–300kHz fixed frequency, delivers ±1% output voltage accuracy over 1.1V–1.85V range, supports true remote sensing, and targets high-current CPU core power delivery in internet servers and workstations.

For engineers reviewing the LTC1709EG-9#TRPBF datasheet, LTC1709EG-9#TRPBF pinout, LTC1709EG-9#TRPBF application, or LTC1709EG-9#TRPBF equivalent, key selection criteria include VRM9.0 VID compliance, 2-phase current-mode control for precise load sharing, OPTI-LOOP™ compensation for wide ESR capacitor compatibility, and integrated differential amplifier for millivolt-level remote sense accuracy.

Technical Context

The LTC1709EG-9#TRPBF implements a constant-frequency, current-mode control architecture with antiphase 2-phase operation to halve input RMS ripple and improve transient response. Its dual-channel design uses independent ITH-controlled peak current comparators and shared error amplifier feedback via VID-programmed resistive attenuation.

It integrates a unity-gain differential amplifier (ADA = 0.995–1.005 V/V, CMRR = 46–55 dB) for true remote sensing, a phase-locked loop (f_NOM = 190–250 kHz) for synchronization, and an internal 5V LDO (V_INTVCC = 4.8–5.2 V) with EXTVCC switchover at 4.5–4.7 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	1.1V to 1.85V per VRM9.0 specification - sets core supply for Pentium III/IV-class processors.
Switching Frequency	150kHz to 300kHz - balances efficiency (lower f) and component size (higher f); adjustable via PLLFLTR pin.
Output Voltage Accuracy	±1% - ensures stable CPU operation under dynamic load without margining overhead.
Input Voltage Range	4V to 36V - supports wide-input industrial and server DC distribution rails.
Current Sense Threshold	62mV to 88mV - defines peak inductor current limit; enables precise R_SENSE-based current protection.
Soft-Start Current	–0.5µA to –1.2µA - controls ramp rate of RUN/SS capacitor for inrush-limited startup.
Shutdown Current	20µA to 40µA - minimizes standby power loss in system-level power sequencing.

Pinout & Package

Package: 36-lead narrow SSOP (G package), 0.209" body width, 0.025" pitch, RoHS-compliant, moisture sensitivity level 3.

Pin/Terminal	Circuit Role	Design Meaning
RUN/SS (Pin 1)	Soft-start timer & shutdown control	Capacitor-based ramp sets startup time; <0.8V forces full shutdown with 20µA quiescent current.
SENSE1+/SENSE1− (Pins 2,3)	Differential current sense inputs	Measure voltage drop across R_SENSE1; define channel 1 peak current threshold (62–88 mV).
EAIN (Pin 4)	Error amplifier inverting input	Receives attenuated feedback from VDIFFOUT; compared to 0.800V reference for regulation.
PLLFLTR (Pin 5)	PLL low-pass filter node	DC voltage (0–2.4V) sets oscillator frequency from 140kHz to 310kHz; also accepts sync signal.
TG1 (Pin 35)	Top gate driver output	Floating high-side drive referenced to SW1; swings from SW1 to INTVCC + SW1 for N-MOSFET gate turn-on.
BG1 (Pin 31)	Bottom gate driver output	Ground-referenced low-side drive; 0V to INTVCC swing for synchronous rectification control.
VID0–VID4 (Pins 17–21)	VRM9.0 5-bit voltage ID inputs	Binary code selects 1.1V–1.85V output; internal 40kΩ pull-ups with diode clamping for safe interfacing.
PGOOD (Pin 23)	Power-good open-drain output	Asserts low when EAIN deviates >±7.5% from setpoint - signals host controller that rail is stable.

Key Features

Feature	Design Value
2-phase antiphase operation	Reduces input capacitor RMS current by ~70%, enabling smaller, lower-ESR bulk capacitors and quieter input rails.
OPTI-LOOP™ compensation	Allows stable loop response across 10µF–1000µF output capacitors with ESR from 1mΩ to 100mΩ - eliminates redesign for capacitor sourcing changes.
True remote sensing amplifier	0.995–1.005 V/V gain and 46–55 dB CMRR enable sub-10mV regulation error at 40A loads despite PCB trace IR drops.
Programmable current foldback	Automatically reduces peak current threshold during short-circuit events (VEAIN < 0.7V) to limit MOSFET thermal stress without latchoff.
Internal 5V LDO with EXTVCC switchover	Reduces driver power loss by sourcing INTVCC from VOUT (via EXTVCC) instead of VIN-derived LDO - improves overall converter efficiency by 0.5–1.2%.

Applications

Internet Servers	Workstations
Use Scenario: Dual-processor 1U rack server requiring stable 1.25V/40A core rail with fast load-step response. IC Role / Device Role / Timing Role: Primary 2-phase VRM9.0 controller managing CPU core voltage with antiphase switching and remote sense feedback. Use Value: Enables single-controller solution for high-current CPU rails while reducing input ripple current by 75% versus single-phase designs.	Use Scenario: High-end engineering workstation with multi-core Xeon processor demanding tight voltage tolerance (<±1%) under burst loads. IC Role / Device Role / Timing Role: Synchronous buck controller implementing current-mode regulation with OPTI-LOOP™ for consistent transient performance across capacitor aging. Use Value: Maintains ±1% output accuracy across temperature and load, eliminating need for post-manufacturing calibration.
Large Memory Arrays	DC Power Distribution Systems
Use Scenario: DDR2/DDR3 memory subsystem requiring tightly regulated 1.5V/25A supply with minimal noise coupling into data lines. IC Role / Device Role / Timing Role: Dual-channel controller delivering low-noise, low-ripple power using antiphase switching and differential remote sensing. Use Value: Achieves <15mVpp output ripple at 25A due to ripple cancellation between phases - prevents memory timing violations.	Use Scenario: Industrial programmable logic controller (PLC) with distributed 1.2V FPGA core rail fed from 24V DC bus. IC Role / Device Role / Timing Role: High-efficiency step-down controller supporting wide 4V–36V input range and robust overvoltage/undervoltage protection. Use Value: Operates reliably across brownout conditions (UVLO = 3–4V) and maintains regulation up to 36V transients - extends system uptime.

Internet Servers

Workstations

Use Scenario: Dual-processor 1U rack server requiring stable 1.25V/40A core rail with fast load-step response.

IC Role / Device Role / Timing Role: Primary 2-phase VRM9.0 controller managing CPU core voltage with antiphase switching and remote sense feedback.

Use Value: Enables single-controller solution for high-current CPU rails while reducing input ripple current by 75% versus single-phase designs.

Use Scenario: High-end engineering workstation with multi-core Xeon processor demanding tight voltage tolerance (<±1%) under burst loads.

IC Role / Device Role / Timing Role: Synchronous buck controller implementing current-mode regulation with OPTI-LOOP™ for consistent transient performance across capacitor aging.

Use Value: Maintains ±1% output accuracy across temperature and load, eliminating need for post-manufacturing calibration.

Large Memory Arrays

DC Power Distribution Systems

Use Scenario: DDR2/DDR3 memory subsystem requiring tightly regulated 1.5V/25A supply with minimal noise coupling into data lines.

IC Role / Device Role / Timing Role: Dual-channel controller delivering low-noise, low-ripple power using antiphase switching and differential remote sensing.

Use Value: Achieves <15mVpp output ripple at 25A due to ripple cancellation between phases - prevents memory timing violations.

Use Scenario: Industrial programmable logic controller (PLC) with distributed 1.2V FPGA core rail fed from 24V DC bus.

IC Role / Device Role / Timing Role: High-efficiency step-down controller supporting wide 4V–36V input range and robust overvoltage/undervoltage protection.

Use Value: Operates reliably across brownout conditions (UVLO = 3–4V) and maintains regulation up to 36V transients - extends system uptime.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2-phase VRM9.0 controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6522CRZ-T	Single 2-phase controller with VRM9.0 support; lacks integrated differential amplifier and OPTI-LOOP™ compensation.	Requires external op-amp for remote sensing; less tolerant of high-ESR output capacitors.	Select when cost sensitivity outweighs need for integrated sensing and broad capacitor compatibility.
TPS51220ARGER	Single 2-phase controller with VRM9.0 support; includes integrated MOSFET drivers but no EXTVCC switchover or PLL synchronization.	Fixed 300kHz operation only; no frequency tuning or external sync capability.	Select when board space is constrained and external sync is unnecessary.

Compared with ISL6522CRZ-T and TPS51220ARGER, the LTC1709EG-9#TRPBF provides superior remote sensing accuracy, wider frequency adjustability (150–300kHz), and flexible power sourcing (EXTVCC switchover), making it optimal for high-reliability server and workstation platforms where regulation precision and thermal management are critical.

Availability

LTC1709EG-9#TRPBF is available at Aetrix Electronics and suitable for internet servers, workstations, and large memory arrays requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LTC1709EG-9#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 its high-performance power management portfolio with rigorous automotive-grade qualification and industrial reliability standards.

The LTC1709EG-9#TRPBF belongs to Linear's PolyPhase™ controller family, designed specifically for high-current, low-voltage CPU and ASIC core power delivery in enterprise computing systems requiring VRM8.4/9.0 compliance.

FAQ

What is the VID voltage range supported by the LTC1709EG-9#TRPBF?

The LTC1709EG-9#TRPBF implements the VRM9.0 specification and supports a 5-bit VID code defining output voltages from 1.100V to 1.850V in 25mV steps. This range is optimized for Intel Pentium III/IV and compatible microprocessors requiring tighter core voltage tolerances than VRM8.4.

Does the LTC1709EG-9#TRPBF require external components for soft-start control?

Yes - the LTC1709EG-9#TRPBF uses an external capacitor on the RUN/SS pin (Pin 1) to set soft-start duration. A typical 100nF capacitor yields ~83ms ramp time. The internal 1.2µA current source charges this capacitor; reaching 1.5V enables regulation while clamping ITH at ~30% of full scale.

How does the LTC1709EG-9#TRPBF achieve current sharing between its two phases?

The LTC1709EG-9#TRPBF achieves inherent current sharing through current-mode control: each phase uses identical ITH-controlled peak current comparators and shares the same error amplifier output. Antiphase clocking (180° phase shift) ensures balanced thermal loading and eliminates circulating currents between channels.

Can the LTC1709EG-9#TRPBF operate with ceramic output capacitors only?

Yes - the OPTI-LOOP™ compensation architecture of the LTC1709EG-9#TRPBF is explicitly designed to stabilize the control loop with ceramic capacitors (ESR as low as 1mΩ) as well as higher-ESR tantalum or polymer types. No external compensation network is required for stability across this range.

What protection features are integrated into the LTC1709EG-9#TRPBF?

The LTC1709EG-9#TRPBF integrates overvoltage soft-latch (trip at ±7.5% of setpoint), undervoltage lockout (3–4V), current foldback during short-circuit, timed short-circuit shutdown via RUN/SS capacitor discharge, and thermal shutdown (T_J = 125°C). All protections are fully specified over –40°C to 85°C ambient.

LTC1709EG-9#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 36-SSOP (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 2

Output Phases:: 2

Voltage - Supply (Vcc/Vdd):: 4V ~ 36V

Frequency - Switching:: 140kHz ~ 320kHz

Duty Cycle (Max):: 99.5%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Enable, Power Good, Soft Start

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 36-SSOP

LTC1709EG-9#TRPBF FAQ

1.How can I place an order for LTC1709EG-9#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC1709EG-9#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 LTC1709EG-9#TRPBF reliable?

The price and inventory of LTC1709EG-9#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1709EG-9#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC1709EG-9#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1709EG-9#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC1709EG-9#TRPBF?

LTC1709EG-9#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC1709EG-9#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 LTC1709EG-9#TRPBF?

For technical support, including LTC1709EG-9#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1709EG-9#TRPBF requirements.

6.How does Aetrix verify that LTC1709EG-9#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC1709EG-9#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 LTC1709EG-9#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC1709EG-9#TRPBF?

All LTC1709EG-9#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1709EG-9#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 LTC1709EG-9#TRPBF part is unused and in its original packaging.

Return procedure for LTC1709EG-9#TRPBF:

1.Submit a request within 90 days.

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

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