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Analog Devices Inc. LTC1709EG-7#TRPBF
- Part No.:
- LTC1709EG-7#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1709EG-7#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,071
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Product details
Overview
LTC1709EG-7 from Analog Devices (formerly Linear Technology) is a 2-phase, 5-bit VID-programmable, current-mode 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 0.925V–2V range, supports true remote sensing via differential amplifier, and enables high-efficiency operation in mobile/desktop computers and internet servers.
For engineers reviewing the LTC1709EG-7 datasheet, LTC1709EG-7 pinout, LTC1709EG-7 application, or LTC1709EG-7 equivalent, key selection considerations include its dual-phase antiphase operation reducing input capacitor RMS ripple, OPTI-LOOP™ compensation for wide ESR capacitor compatibility, three selectable operating modes (PWM/Burst/Cycle Skip), and 36-lead narrow SSOP package with verified thermal performance up to 85°C ambient.
Technical Context
The LTC1709EG-7 implements a constant-frequency, current-mode control architecture with two independent 180° out-of-phase output channels. Each channel uses peak-current sensing referenced to an adjustable ITH voltage, with built-in dropout detection and forced top-MOSFET off-pulse for bootstrap capacitor recharge during low-VIN conditions.
Its phase-locked loop accepts external synchronization via PLLIN and allows frequency tuning from 140kHz to 310kHz using a DC voltage on PLLFLTR. The FCB pin selects among forced continuous PWM, Burst Mode™, or constant-frequency discontinuous operation-each altering transient response, efficiency, and reverse-inductor-current handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.925V to 2.0V, set by 5-bit VID code with ±1% accuracy over temperature |
| Switching Frequency | 150kHz–300kHz fixed or 140kHz–310kHz PLL-synchronized; antiphase operation halves input ripple current |
| Input Voltage Range | 4V to 36V; supports dual-input supply capability for load sharing across rails |
| Current Sensing | True differential sense inputs (SENSE1±/SENSE2±); max threshold 75mV with programmable foldback |
| Control Architecture | Current mode with OPTI-LOOP™ compensation; enables stable regulation with ceramic or high-ESR output capacitors |
| Operating Modes | Three user-selectable: PWM (forced continuous), Burst Mode™ (high-efficiency light-load), Cycle Skip (constant-frequency discontinuous) |
| Thermal Rating | Guaranteed operation from 0°C to 70°C; design-correlated –40°C to 85°C ambient range |
Pinout & Package
Package: 36-lead narrow SSOP (G package), 0.209" body width, 0.025" lead pitch, JEDEC MS-012AC compliant. Thermal resistance θJA = 85°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Soft-start timer & short-circuit latch control | Capacitor sets ramp time; <0.8V forces shutdown; discharge current triggers timed latchoff during overcurrent |
| SENSE1+/SENSE1– (Pins 2,3) | Differential current sense inputs (Channel 1) | Measure voltage drop across RSENSE; set peak inductor current threshold with ITH voltage |
| EAIN (Pin 4) | Error amplifier inverting input | Compares feedback voltage to internal 0.800V reference; determines regulation setpoint |
| PLLFLTR (Pin 5) | PLL loop filter / frequency control node | DC voltage (0–2.4V) sets oscillator frequency; also accepts external loop filter for jitter reduction |
| FCB (Pin 7) | Forced continuous/burst mode select | Voltage <0.8V → forced PWM; 0.8–INTVCC–2V → Burst Mode™; tied to INTVCC → constant-frequency mode |
| ITH (Pin 8) | Error amplifier output & current limit control | 0–2.4V range controls peak current threshold; used for slope compensation and transient optimization |
| VDIFFOUT (Pin 10) | Differential amplifier output | Drives external resistive divider for true remote sensing of VOUT+ and VOUT– in high-current PCB traces |
| VID0–VID4 (Pins 17–21) | 5-bit VID programming inputs | Set output voltage per Intel Mobile VID standard; internal 40kΩ pull-ups with diode protection |
| PGOOD (Pin 23) | Open-drain power-good indicator | Asserts low when EAIN deviates >±7.5% from setpoint; 10µs response time |
| TG1/TG2 (Pins 35,24) | Top N-MOSFET gate drivers | Floating drivers with swing = INTVCC + SW node voltage; 30–90ns transition times |
| BG1/BG2 (Pins 31,27) | Bottom N-MOSFET gate drivers | GND-referenced drivers; 20–90ns fall time; enable synchronous rectification |
| INTVCC (Pin 29) | Internal 5V LDO output | Powers control circuitry and drivers; switchover to EXTVCC >4.7V improves efficiency |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase antiphase operation | Reduces input capacitor RMS ripple by ~70% and cuts required capacitance vs single-phase designs |
| OPTI-LOOP™ compensation | Enables stable loop response across ceramic, polymer, and electrolytic output capacitors without redesign |
| True remote sensing amplifier | 1.005V/V gain and 55dB CMRR support millivolt-level regulation accuracy despite PCB trace IR drops |
| Three selectable operating modes | Burst Mode™ achieves >90% efficiency at 1A load; constant-frequency mode maintains noise predictability down to 0.4A |
| Programmable soft-start & short-circuit protection | Capacitor-timed ramp prevents inrush; RUN/SS discharge initiates latchoff after sustained <70% VOUT |
| Active voltage positioning | Automatic VOUT droop under load compensates for IR losses, maintaining tight regulation at point-of-load |
Applications
| Mobile/Desktop CPU Core Power | Internet Server VRM |
|---|---|
Use Scenario: Delivering tightly regulated 1.2V–1.8V core voltage to high-performance x86 processors with dynamic load steps up to 40A/µs. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing two parallel power stages with 180° phase shift and current-mode feedback. Use Value: Antiphase operation reduces input ripple current by 70%, enabling smaller bulk capacitors; OPTI-LOOP™ ensures stability with low-ESR ceramic output caps. | Use Scenario: High-density 12V-to-1.5V conversion for multi-core server CPUs requiring >100A total output with minimal board area. IC Role / Device Role / Timing Role: 2-phase controller with VID interface supporting Intel VRM specifications and remote sensing across long motherboard traces. Use Value: True differential sensing maintains ±1% regulation at point-of-load; Burst Mode™ extends efficiency >85% down to 5A load. |
| Large Memory Array Supply | DC Power Distribution System |
Use Scenario: Powering DDR4/DDR5 memory modules with fast transient response and low output noise. IC Role / Device Role / Timing Role: Synchronous step-down controller delivering 1.1V or 1.25V with cycle-skip mode for predictable EMI profile. Use Value: Constant-frequency operation eliminates variable-frequency noise; PGOOD signal enables system-level power sequencing. | Use Scenario: Centralized 48V-to-12V or 24V-to-5V conversion feeding distributed point-of-load regulators in telecom or industrial systems. IC Role / Device Role / Timing Role: Primary-stage controller supporting dual-input capability to balance load between redundant supplies. Use Value: Dual-input operation allows seamless load sharing across independent rails; wide 4V–36V VIN accommodates varied upstream sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CRZ-T | Fixed 300kHz frequency only; no VID interface; requires external DAC for voltage setting | Lacks integrated VID decoder and Burst Mode™; suited for fixed-voltage, non-mobile applications | Select when VID programmability and light-load efficiency are not required; verify external compensation network |
| TPS546D24RSAR | Single-chip 60A solution with integrated MOSFETs; supports PMBus; no discrete MOSFET flexibility | Higher integration reduces BOM count but eliminates discrete FET selection; lacks antiphase input ripple reduction | Choose for space-constrained designs where 60A monolithic output suffices and input ripple minimization is secondary |
Compared with LTC1709EG-7, ISL6522CRZ-T offers simpler fixed-frequency control but lacks VID and Burst Mode™ efficiency optimization, while TPS546D24RSAR integrates power stages at the cost of discrete FET flexibility and antiphase ripple cancellation-making LTC1709EG-7 optimal for high-current, low-noise, VID-compliant CPU/memory supplies.
Availability
LTC1709EG-7 is available at Aetrix Electronics and suitable for mobile/desktop computers, internet servers, and large memory arrays requiring stable component supply with full industrial temperature range correlation and long-term production continuity.
Supply support for LTC1709EG-7 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 LTC1709EG-7 belongs to ADI's Power Management product line, designed specifically for high-efficiency, multiphase CPU and memory core power delivery in computing infrastructure where precision regulation, thermal robustness, and VID compliance are critical.
FAQ
What is the guaranteed operating temperature range for the LTC1709EG-7?
The LTC1709EG-7 is guaranteed to meet all performance specifications from 0°C to 70°C. Its design is correlated to operate reliably across –40°C to 85°C ambient, supported by characterization data and statistical process controls-making it suitable for commercial and extended-temperature computing applications where the LTC1709EG-7 serves as the primary VRM controller.
How does the LTC1709EG-7 achieve true remote output voltage sensing?
The LTC1709EG-7 uses an integrated differential amplifier with VOS+ and VOS– inputs and VDIFFOUT output to measure the voltage difference between both positive and negative output terminals. This configuration compensates for IR drops across PCB traces and connectors, enabling accurate regulation at the load. The LTC1709EG-7's amplifier provides 1.005V/V gain and 55dB common-mode rejection, ensuring stable feedback even with millivolt-level sense errors.
Can the LTC1709EG-7 be synchronized to an external clock source?
Yes, the LTC1709EG-7 supports external synchronization via the PLLIN pin, which connects to an internal phase detector. When driven with a clean square wave, the phase-locked loop aligns the rising edge of TG1 with the PLLIN signal's rising edge. The PLLFLTR pin simultaneously serves as the loop filter node and DC frequency control input, allowing precise tuning from 140kHz to 310kHz-enhancing EMI management in systems using the LTC1709EG-7.
What protection features does the LTC1709EG-7 include for overload and fault conditions?
The LTC1709EG-7 integrates multiple protections: overvoltage lockout (OV) disables the top MOSFET if EAIN exceeds ±7.5% of setpoint; undervoltage lockout (UVLO) disables operation below 3.5V VIN; current foldback limits MOSFET dissipation during shorts; and RUN/SS-based timed latchoff shuts down the controller after sustained low-VOUT events. These ensure robust operation of the LTC1709EG-7 in mission-critical power systems.
How does the FCB pin affect the LTC1709EG-7's operating modes and efficiency?
The FCB pin selects among three distinct modes: <0.8V forces continuous PWM (best transient response, lowest efficiency at light loads); 0.8V–(INTVCC–2V) enables Burst Mode™ (highest light-load efficiency, ~90% at 1A); tying to INTVCC activates constant-frequency discontinuous mode (predictable EMI, efficient down to ~1% full load). This flexibility makes the LTC1709EG-7 adaptable across diverse load profiles without hardware changes.
LTC1709EG-7#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, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-SSOP
LTC1709EG-7#TRPBF FAQ
1.How can I place an order for LTC1709EG-7#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1709EG-7#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-7#TRPBF reliable?
The price and inventory of LTC1709EG-7#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-7#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1709EG-7#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1709EG-7#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1709EG-7#TRPBF?
LTC1709EG-7#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1709EG-7#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-7#TRPBF?
For technical support, including LTC1709EG-7#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1709EG-7#TRPBF requirements.
6.How does Aetrix verify that LTC1709EG-7#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1709EG-7#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-7#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1709EG-7#TRPBF?
All LTC1709EG-7#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1709EG-7#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-7#TRPBF part is unused and in its original packaging.
Return procedure for LTC1709EG-7#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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