My Inquiry
My Account
Analog Devices Inc. LTC1709EG-8#TRPBF
- Part No.:
- LTC1709EG-8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1709EG-8#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,152
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1709EG-8#TRPBF from Analog Devices (formerly Linear Technology) is a 2-phase, VID-programmable synchronous step-down switching regulator controller driving two external N-channel MOSFET stages. It operates at fixed frequencies from 150kHz to 300kHz, delivers ±1% output voltage accuracy over 1.3V–3.5V (VRM8.4), supports true remote sensing via differential amplifier, and targets high-current CPU core power delivery in workstations and internet servers.
For engineers reviewing the LTC1709EG-8#TRPBF datasheet, LTC1709EG-8#TRPBF pinout, LTC1709EG-8#TRPBF application, or LTC1709EG-8#TRPBF equivalent, key selection criteria include VRM8.4 VID compliance, 2-phase current-mode control for precise load sharing, OPTI-LOOP™ compensation for wide ESR capacitor support, antiphase operation to reduce input RMS ripple, and integrated short-circuit shutdown with foldback limiting.
Technical Context
The LTC1709EG-8#TRPBF implements a constant-frequency, current-mode control architecture with dual independent PWM channels operating 180° out of phase. Its internal differential amplifier provides true remote sensing across both output terminals, and the error amplifier output (ITH) directly sets peak inductor current per channel via adjustable threshold (62–88 mV).
Frequency is programmable via PLLFLTR pin (120–360 kHz range) and synchronizable via PLLIN; VID0–VID4 pins select one of 32 output voltages per VRM8.4 table; RUN/SS enables soft-start ramping and timed short-circuit shutdown; PGOOD asserts open-drain low when EAIN deviates >±7.5% from 0.8 V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.3 V to 3.5 V (VRM8.4 compliant; set by 5-bit VID code) |
| Switching Frequency | 150 kHz to 300 kHz (fixed, antiphase; reduces input/output RMS ripple) |
| Output Voltage Accuracy | ±1% (over temperature and line/load; ensures tight CPU core regulation) |
| Input Voltage Range | 4 V to 36 V (supports wide industrial and server DC bus inputs) |
| Current Sense Threshold | 62–88 mV (adjustable via RSENSE; enables precise peak-current limiting) |
| Remote Sensing | Differential amplifier (VOS+/VOS−, SENSE1+/SENSE1−, SENSE2+/SENSE2−) with 0.995–1.005 V/V gain and 46–55 dB CMRR |
| Shutdown Current | 20 µA (low quiescent draw during system standby) |
| Package | 36-lead narrow SSOP (0.209" body width; RoHS-compliant, thermally enhanced) |
Pinout & Package
Package: 36-lead narrow SSOP (G package), 0.025" pitch, exposed pad not present, θJA = 90°C/W, rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Soft-start timing & short-circuit detection input | Capacitor-to-ground sets ramp time; <0.8 V forces shutdown; discharge initiates latchoff on sustained overcurrent |
| SENSE1+/SENSE1− (Pins 2,3) | Differential current sense inputs (Channel 1) | Measure voltage drop across RSENSE1; define peak current limit threshold with ITH |
| EAIN (Pin 4) | Error amplifier inverting input | Compares feedback voltage (from VDIFFOUT divider) to 0.8 V internal reference |
| PLLFLTR (Pin 5) | PLL loop filter / frequency control node | DC voltage (0–2.4 V) sets oscillator frequency; also accepts AC sync signal via PLLIN |
| TG1 (Pin 35), BG1 (Pin 31) | Top/bottom gate drivers (Channel 1) | TG1 swings INTVCC above SW1; BG1 swings 0–INTVCC; drive external N-MOSFETs |
| VDIFFOUT (Pin 10) | Differential amplifier output | Provides true remote-sensed output voltage; drives external VID-resistive divider |
| VID0–VID4 (Pins 17–21) | 5-bit VRM8.4 voltage identification inputs | Set regulated output between 1.3 V and 3.5 V in 50 mV steps per VRM8.4 spec |
| PGOOD (Pin 23) | Power-good status indicator | Open-drain output pulled low when EAIN deviates >±7.5% from target; 10 µs response |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase Antiphase Operation | Reduces input capacitor RMS current by ~70%, enabling smaller CIN and lower ESR requirements |
| OPTI-LOOP™ Compensation | Allows stable loop response across wide range of output capacitor types and ESR values without redesign |
| True Remote Differential Sensing | Compensates for PCB trace IR drop up to ±50 mV; maintains regulation accuracy at >40 A loads |
| Programmable Fixed-Frequency Control | 150–300 kHz range avoids AM radio band; enables predictable EMI filtering and thermal management |
| Integrated Short-Circuit Protection | Combines timed RUN/SS discharge latchoff with current foldback to limit MOSFET dissipation during fault |
| VRM8.4 VID Compliance | Direct support for Intel Pentium III/IV-era CPU core voltage sequencing and dynamic scaling |
Applications
| Workstation CPU Core Power | Internet Server VRM |
|---|---|
Use Scenario: High-current, dynamically scaled core supply for dual-processor x86 workstations requiring rapid load transient response and tight voltage tolerance. IC Role / Device Role / Timing Role: Primary 2-phase VRM controller managing two parallel buck stages with antiphase clocking and VID-based voltage selection. Use Value: Delivers up to 40 A at 1.3–3.5 V with ±1% accuracy and <10 µs PGOOD assertion, meeting Intel VRM8.4 specification for desktop/workstation platforms. | Use Scenario: Centralized core voltage regulation in 1U/2U rack-mounted servers where thermal density and input capacitance size are constrained. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller coordinating two interleaved phases to minimize input ripple and improve thermal distribution across PCB. Use Value: Reduces required input capacitor RMS rating by 75% versus single-phase design, lowering BOM cost and board area while maintaining <1% load regulation. |
| Large Memory Array Supply | DC Power Distribution System |
Use Scenario: Stable, low-noise 2.5 V or 3.3 V supply for DDR SDRAM banks with high peak current demands and strict PSRR requirements. IC Role / Device Role / Timing Role: High-efficiency step-down controller using OPTI-LOOP™ to stabilize loop with ceramic output capacitors and low-ESR polymer types. Use Value: Achieves >90% efficiency at 20 A output with 12 V input, and suppresses high-frequency noise via antiphase cancellation-critical for memory signal integrity. | Use Scenario: Distributed point-of-load regulation in telecom or industrial backplanes where multiple isolated 1.8–3.3 V rails feed FPGA, ASIC, or DSP subsystems. IC Role / Device Role / Timing Role: Programmable, robust controller supporting wide VIN (4–36 V) and offering remote sensing to compensate for long power delivery traces. Use Value: Enables single-controller solution for dual-rail generation with independent soft-start and fault reporting via PGOOD, simplifying system-level power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-phase VRM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CRZ-T | Supports VRM8.5/9.0 only; no VRM8.4 VID table; requires external bootstrap diodes | Targeted at later-generation Pentium 4 platforms; lacks integrated EXTVCC switchover | Select if upgrading to VRM9.0 systems or needing higher max frequency (up to 1 MHz) |
| TPS51216RGET | Single-phase only; integrates MOSFET drivers and LDO; no differential remote sensing | Designed for notebook CPU VRMs with space-constrained layouts; no antiphase ripple reduction | Choose for compact, low-cost single-rail designs where input ripple minimization is secondary |
Compared with ISL6522CRZ-T and TPS51216RGET, the LTC1709EG-8#TRPBF uniquely combines VRM8.4 compliance, true differential remote sensing, antiphase 2-phase operation, and EXTVCC switchover-making it optimal for legacy workstation/server platforms requiring strict adherence to Intel's VRM8.4 specification and high-current stability.
Availability
LTC1709EG-8#TRPBF is available at Aetrix Electronics and suitable for workstation CPU core power, internet server VRM, and large memory array supply applications requiring stable component supply, long-term lifecycle support, and full-specification compliance.
Supply support for LTC1709EG-8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1709EG-8#TRPBF belongs to Linear's legacy PolyPhase® VRM controller product line, engineered specifically for high-current, multi-phase CPU and GPU core voltage regulation in computing infrastructure with emphasis on efficiency, transient response, and VRM specification compliance.
FAQ
What is the supported VID standard for LTC1709EG-8#TRPBF?
The LTC1709EG-8#TRPBF implements the VRM8.4 voltage identification standard, supporting 32 discrete output voltages from 1.30 V to 3.50 V in 50 mV increments via its 5-bit VID0–VID4 inputs. This matches Intel's Pentium III and early Pentium 4 platform requirements and is distinct from the VRM9.0 table used in the LTC1709-9 variant.
Does LTC1709EG-8#TRPBF support remote voltage sensing?
Yes, the LTC1709EG-8#TRPBF includes an integrated differential amplifier with dedicated VOS+, VOS−, SENSE1+/SENSE1−, and SENSE2+/SENSE2− pins. This enables true remote sensing across both positive and negative output terminals, compensating for PCB trace resistance and maintaining ±1% regulation accuracy even at >40 A load currents.
How does the antiphase 2-phase operation of LTC1709EG-8#TRPBF improve system performance?
The LTC1709EG-8#TRPBF drives its two output stages 180° out of phase, effectively doubling the fundamental ripple frequency. This cuts input capacitor RMS current by ~70% and output ripple amplitude by ~50% compared to single-phase operation-reducing required capacitance, ESR, board area, and thermal stress on input/output capacitors.
What protection features are integrated into LTC1709EG-8#TRPBF?
The LTC1709EG-8#TRPBF integrates overvoltage soft-latch (±7.5% trip), undervoltage lockout (3.5 V nominal), current foldback limiting, timed short-circuit shutdown via RUN/SS capacitor discharge, and dropout detection with forced bootstrap recharge. All functions remain active across –40°C to +85°C ambient operation.
Can LTC1709EG-8#TRPBF operate with an external 5 V supply for gate drive?
Yes, the LTC1709EG-8#TRPBF supports EXTVCC switchover: when a clean 4.7–7 V external supply is applied to Pin 30 (EXTVCC), the internal 5 V LDO is disabled and INTVCC is sourced directly from EXTVCC via an internal switch. This improves efficiency and gate drive strength, especially in high-current or high-temperature environments.
LTC1709EG-8#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-8#TRPBF FAQ
1.How can I place an order for LTC1709EG-8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1709EG-8#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-8#TRPBF reliable?
The price and inventory of LTC1709EG-8#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-8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1709EG-8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1709EG-8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1709EG-8#TRPBF?
LTC1709EG-8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1709EG-8#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-8#TRPBF?
For technical support, including LTC1709EG-8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1709EG-8#TRPBF requirements.
6.How does Aetrix verify that LTC1709EG-8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1709EG-8#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-8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1709EG-8#TRPBF?
All LTC1709EG-8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1709EG-8#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-8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1709EG-8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1709EG-8#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
