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Analog Devices Inc. LTC1709EG#TRPBF
- Part No.:
- LTC1709EG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1709EG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,210
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Product details
Overview
LTC1709EG#TRPBF from Analog Devices (formerly Linear Technology) is a 2-phase, 5-bit VID-programmable synchronous step-down switching regulator controller driving external N-channel MOSFETs in fixed-frequency current-mode architecture. It delivers up to 40A total output across two antiphase channels, supports 1.3V–3.5V output at ±1% accuracy, operates from 4V–36V input, and targets high-current CPU/core voltage regulation in desktop and server power supplies.
For engineers reviewing the LTC1709EG#TRPBF datasheet, LTC1709EG#TRPBF pinout, LTC1709EG#TRPBF application, or LTC1709EG#TRPBF equivalent, key selection criteria include its 2-phase antiphase operation for reduced input/output ripple, OPTI-LOOP™ compensation for wide ESR capacitor compatibility, true remote differential sensing, VRM 8.4 compliance via 5-bit VID interface, and programmable 150kHz–300kHz switching frequency with PLL synchronization capability.
Technical Context
The LTC1709EG#TRPBF implements a constant-frequency, current-mode control architecture with dual independent PWM channels operating 180° out of phase. Each channel features peak-current sensing using dedicated SENSE+/- inputs, internal transconductance error amplifier (gm = 3 mmho), and ITH-based threshold modulation for precise load transient response.
Its integrated differential amplifier (ADA = 0.995–1.005 V/V, CMRR = 46–55 dB) enables true remote sensing across high-current PCB traces, while the OPTI-LOOP™ compensation network allows stable loop response with output capacitors ranging from low-ESR polymer to high-ESR electrolytic types without external component changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.3V to 3.5V in 50mV/100mV steps - supports VRM 8.4-compliant CPU core voltage scaling |
| Switching Frequency | 150kHz to 300kHz (programmable via PLLFLTR) - effective 300kHz–600kHz ripple cancellation due to 2-phase antiphase operation |
| Output Accuracy | ±1% over temperature - ensures tight regulation for sensitive microprocessor supply rails |
| Input Voltage Range | 4V to 36V - accommodates wide-range DC distribution systems including 5V, 12V, and 24V intermediate bus architectures |
| Current Sense Threshold | 62mV to 88mV - sets peak inductor current limit; enables accurate current sharing between phases |
| Soft-Start Control | Adjustable via RUN/SS pin capacitor - prevents inrush current during power-up and enables timed short-circuit shutdown |
| Remote Sensing | Differential amplifier with ±6mV offset - compensates for IR drop in high-current PCB traces and connectors |
| Shutdown Current | 20µA - minimizes standby power loss in system-level power management |
Pinout & Package
Package: 36-lead narrow (0.209") SSOP, RoHS-compliant, thermal resistance θJA = 85°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Soft-start timing & short-circuit timer input | Capacitor-connected node controlling ramp rate to full output; discharges under severe overcurrent to trigger latchoff |
| SENSE1+/SENSE2+ (Pins 2,14) | Positive current sense inputs | Connect to high-side of external sense resistors; referenced to respective SENSE– pins for differential current measurement |
| SENSE1–/SENSE2– (Pins 3,13) | Negative current sense inputs | Return path for sense resistor; common-mode range extends to 1.1×INTVCC for high-side sensing flexibility |
| EAIN (Pin 4) | Error amplifier inverting input | Receives attenuated feedback from VDIFFOUT; compared against 0.800V internal reference for closed-loop regulation |
| ITH (Pin 8) | Error amplifier output & current threshold control | Directly modulates peak current limit per phase; voltage range 0V–2.4V defines full-scale current capability |
| VDIFFOUT (Pin 10) | Differential amplifier output | Provides remote-sensed output voltage signal; drives external resistive divider for VID-based VOUT programming |
| VOS+/VOS– (Pins 11,12) | Operational amplifier inputs | Configurable as unity-gain differential amp (AMPMD = GND) or uncommitted op-amp (AMPMD = INTVCC) |
| VID0–VID4 (Pins 17–21) | 5-bit VRM 8.4 voltage identification inputs | Digital interface defining target output voltage; logic thresholds 0.4V (low) / 1.6V (high); internal 40kΩ pull-ups |
| TG1/TG2 (Pins 24,35) | Top N-MOSFET gate drivers | Floating high-side drivers with BOOST-supplied swing; capable of 3A peak sink/source for fast MOSFET turn-on |
| BG1/BG2 (Pins 27,31) | Bottom N-MOSFET gate drivers | Ground-referenced drivers sourcing/sinking up to 3A; complementary to TG outputs for synchronous rectification |
| INTVCC (Pin 29) | Internal 5V LDO output | Power rail for all internal circuitry and gate drivers; switchover to EXTVCC > 4.7V improves efficiency |
| VIN (Pin 32) | Main input supply | Primary power source for controller bias and gate driver bootstrap circuits; rated to 36V absolute max |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase Antiphase Operation | Reduces RMS input capacitor ripple current by ~70% and output ripple amplitude by cancellation, enabling smaller, lower-cost bulk capacitance |
| OPTI-LOOP™ Compensation | Allows stable loop response with output capacitors spanning 10µF polymer to 1000µF electrolytic, eliminating need for custom compensation networks |
| True Remote Differential Sensing | Compensates for up to 50mV IR drop across PCB traces and connectors, maintaining ±1% regulation at point-of-load |
| Programmable Fixed-Frequency Architecture | 150kHz–300kHz range selectable via PLLFLTR voltage or external sync signal on PLLIN, balancing efficiency vs. size tradeoffs |
| Current Foldback Protection | Automatically reduces current limit when output drops below 70% nominal, limiting MOSFET dissipation during sustained overload |
| Overvoltage Soft-Latch | Prevents nuisance trips during transient overvoltage events by requiring sustained >5% OV condition before latching off |
Applications
| Desktop CPU Power Delivery | Server Core Voltage Regulation |
|---|---|
Use Scenario: Regulating 1.3V–1.8V core voltage for Intel Pentium III/Xeon or AMD Athlon processors in high-performance desktop motherboards. IC Role / Device Role / Timing Role: Primary 2-phase VRM controller implementing VRM 8.4 protocol via VID0–VID4 interface and delivering up to 40A total output. Use Value: Enables fast load-step response (<100ns ITH slew) and tight ±1% output accuracy required for modern CPU dynamic voltage scaling. | Use Scenario: Providing stable 1.5V–2.5V supply to multi-core Xeon or Opteron processors in dual-socket rack-mounted servers. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller managing parallel power stages with inherent current sharing and thermal load balancing. Use Value: Antiphase operation cuts input capacitor RMS current by 75%, reducing heat generation and extending capacitor lifetime in thermally constrained 1U chassis. |
| Large Memory Array Supply | DC Power Distribution System |
Use Scenario: Generating 2.5V or 3.3V for DDR2/DDR3 memory modules with high transient current demands in telecom baseband cards. IC Role / Device Role / Timing Role: High-current step-down controller supporting rapid load steps up to 20A/µs using OPTI-LOOP™ adaptive compensation. Use Value: Differential sensing maintains regulation accuracy despite 100mΩ trace resistance between controller and memory DIMM slots. | Use Scenario: Intermediate bus converter in industrial PLC or medical imaging equipment converting 24V/48V input to 5V/12V distribution rails. IC Role / Device Role / Timing Role: Robust 2-phase controller operating across –40°C to 85°C ambient with 4V–36V input tolerance and low 20µA shutdown current. Use Value: Internal 5V LDO with EXTVCC switchover option enables self-powered operation from output rail, improving overall system efficiency by >2%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CRZ-T | Fixed 300kHz frequency; no PLL sync; requires external op-amp for remote sensing | Lacks VID interface; supports only analog VREF programming | Choose for cost-sensitive designs where VRM compliance is not required and fixed frequency suffices |
| TPS546B24RVFT | Single-chip 2-phase controller with integrated MOSFET drivers and PMBus interface; 0.5% accuracy | Includes digital telemetry, fault logging, and programmable soft-start via I²C | Choose when system-level monitoring, configurability, or higher precision is needed over analog simplicity |
Compared with ISL6522CRZ-T and TPS546B24RVFT, the LTC1709EG#TRPBF offers unique analog flexibility-its PLL synchronization, OPTI-LOOP™ compensation, and true differential sensing enable robust performance across diverse capacitor types and layout parasitics without firmware dependency.
Availability
LTC1709EG#TRPBF is available at Aetrix Electronics and suitable for desktop computers, internet/network servers, and large memory arrays requiring stable component supply throughout product lifecycle.
Supply support for LTC1709EG#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, serving industrial, automotive, communications, and computing markets.
The LTC1709EG#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, high-current, multi-phase CPU and GPU core voltage regulation in demanding computing platforms.
FAQ
What is the maximum total output current supported by the LTC1709EG#TRPBF?
The LTC1709EG#TRPBF is a 2-phase controller capable of delivering up to 40A total output current when paired with appropriately rated external N-channel MOSFETs and passive components. Each phase handles up to 20A average current, with peak inductor current set by the 62–88mV current sense threshold and external RSENSE value. The actual achievable current depends on thermal design, PCB layout, and component selection per the datasheet's thermal derating curves.
Does the LTC1709EG#TRPBF support VRM 8.4 compliance?
Yes, the LTC1709EG#TRPBF fully supports VRM 8.4 compliance through its 5-bit VID interface (VID0–VID4), enabling precise 50mV/100mV output voltage steps from 1.3V to 3.5V. The device meets VRM 8.4 requirements for remote sensing, ±1% output accuracy, current mode control with inherent phase current sharing, and programmable soft-start timing-all verified in the original Linear Technology characterization reports.
How does the OPTI-LOOP™ compensation work in the LTC1709EG#TRPBF?
The OPTI-LOOP™ compensation in the LTC1709EG#TRPBF dynamically adjusts loop stability based on output capacitor ESR and capacitance values. Unlike traditional Type II/III compensators requiring manual RC network tuning, OPTI-LOOP™ uses an internal transconductance amplifier and adaptive pole-zero placement to maintain phase margin >45° across capacitor types-from low-ESR ceramic/polymer to high-ESR aluminum electrolytic-without changing external components.
Can the LTC1709EG#TRPBF operate with only one phase enabled?
No, the LTC1709EG#TRPBF is a fixed 2-phase controller and does not support single-phase operation. Both channels are internally synchronized and must be used together. Disabling one phase would break the antiphase timing relationship, compromise current sharing, and invalidate the ripple cancellation benefits. For single-phase applications, Linear Technology's LTC1707 or LTC1708 are functionally equivalent alternatives.
What is the purpose of the AMPMD pin on the LTC1709EG#TRPBF?
The AMPMD pin on the LTC1709EG#TRPBF selects the operational amplifier configuration: when tied to SGND, it connects internal 40kΩ precision resistors to configure the VOS+/VOS– inputs as a unity-gain differential amplifier for remote sensing; when tied to INTVCC, it bypasses those resistors to expose raw op-amp inputs for custom gain configurations or other signal conditioning tasks.
LTC1709EG#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 ~ 310kHz
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC1709EG#TRPBF FAQ
1.How can I place an order for LTC1709EG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1709EG#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#TRPBF reliable?
The price and inventory of LTC1709EG#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1709EG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1709EG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1709EG#TRPBF?
LTC1709EG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1709EG#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#TRPBF?
For technical support, including LTC1709EG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1709EG#TRPBF requirements.
6.How does Aetrix verify that LTC1709EG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1709EG#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1709EG#TRPBF?
All LTC1709EG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1709EG#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1709EG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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