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Analog Devices Inc. LTC3709EUH#TRPBF
- Part No.:
- LTC3709EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3709EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,938
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Product details
Overview
LTC3709EUH#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down DC/DC controller implementing constant on-time valley current mode control without requiring an external sense resistor. It delivers 1.5V/30A output with 0.6V ±1% reference, <100ns minimum on-time, and supports tracking/sequencing across multiple regulators. Used in high-current notebook CPU/GPU power supplies.
For engineers reviewing the LTC3709EUH#TRPBF datasheet, LTC3709EUH#TRPBF pinout, LTC3709EUH#TRPBF application, or LTC3709EUH#TRPBF equivalent, key selection criteria include dual-phase synchronization capability, VRNG-programmable current sense threshold (50–200mV), true remote differential sensing, and forced continuous/discontinuous mode selection via FCB pin.
Technical Context
The LTC3709EUH#TRPBF employs a constant on-time, valley current mode architecture with two interleaved 180° out-of-phase channels. Its internal PLL synchronizes channel 2 to channel 1 and enables external clock locking via EXTLPF/FCB pins. The error amplifier output (ITH) directly sets current sense threshold from 0V to 2.4V, enabling precise programmable current limiting.
True differential sensing (VOS+, VOS–, DIFFOUT) provides Kelvin-referenced output voltage monitoring independent of PCB ground path. Tracking functionality uses the TRACK pin to coordinate startup and regulation with other LTC3709 or compatible regulators via resistive dividers, supporting both coincident and ratiometric sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual-phase synchronous buck controller - enables 30A output with reduced ripple and thermal spreading vs single-phase. |
| Reference Voltage | 0.6V ±1% - sets precise output regulation point; tolerance directly impacts output accuracy at 1.5V (±15mV). |
| Min On-Time | <100ns - supports high VIN-to-VOUT ratios (e.g., 12V→1.5V) while maintaining stable switching at 200–300kHz. |
| Current Sense Range | 50–200mV (programmable via VRNG) - allows accurate MOSFET RDS(ON)-based or discrete resistor current sensing. |
| Tracking Accuracy | ±10mV over 0.1–0.5V TRACK input - ensures tight output coordination between multiple LTC3709 controllers in multi-rail systems. |
| PGOOD Threshold | ±10% window with 100µs delay - prevents false fault assertions during transient load steps while ensuring reliable power-good signaling. |
| Operating Temp | –40°C to +85°C - qualified for industrial and computing environments where ambient temperature exceeds consumer grade. |
Pinout & Package
Package: 32-lead (5mm × 5mm) QFN with exposed thermal pad (SGND). Pin count and layout match LTC3709EUH#TRPBF's documented UH package variant; no SSOP ambiguity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS | Run enable & soft-start ramp | 0.8–2.0V start threshold; external capacitor sets output slew rate (~0.5s/µF) and short-circuit timeout duration. |
| ITH | Error amplifier output / current limit setpoint | 0–2.4V control voltage directly scales current sense threshold; 0.8V = zero current detection point. |
| VFB | Feedback node input | Connects to resistor divider from VOUT; 0.6V reference enables standard 1.5V output with 1MΩ/402kΩ divider. |
| TRACK | Output tracking/sequencing interface | Accepts 0.1–0.5V analog signal to coordinate startup and regulation with other regulators; must not be left floating. |
| VRNG | Sense voltage range programming | 0.5–2.0V input sets nominal current sense threshold (≈VRNG/7.5); defaults to 70mV (GND) or 140mV (VCC). |
| FCB | Forced continuous / external clock input | Ground = forced CCM; VCC = DCM; AC signal = external clock sync with PLL lock to rising edge. |
| SENSE1+/SENSE1– SENSE2+/SENSE2– | Differential current sense inputs per phase | Kelvin connections for MOSFET RDS(ON) or external resistor sensing; supports accurate valley current measurement. |
| VOS+/VOS–/DIFFOUT | True remote differential amplifier | Measures VOUT+ and VOUT– separately to reject ground noise; DIFFOUT drives internal error amp for precision regulation. |
| TG1/TG2, BG1/BG2 | Top/bottom gate drivers | Drives N-channel MOSFETs; TG swing = DRVCC + SW voltage; BG swing = 0 to DRVCC; RDS(ON) <3Ω ensures fast switching. |
| PGOOD | Open-drain power-good indicator | Pulled low when VFB exits ±10% window for ≥100µs; requires external pull-up for logic-level interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE operation | Uses synchronous MOSFET RDS(ON) as current sense element - eliminates sense resistor cost, board space, and conduction loss. |
| Valley current mode control | Enables stable light-load DCM operation with automatic reverse-current shutdown - improves efficiency below 10% load. |
| Interleaved dual-phase timing | Internal 180° phase shift between channels reduces input/output ripple current by ~70% vs single-phase at same total current. |
| Programmable overvoltage protection | Fixed +10%/–10% PGOOD window with dedicated OV comparator - shuts off top FET and latches bottom FET on during overvoltage events. |
| True differential remote sensing | Independent VOS+/VOS– inputs reject PCB trace IR drop and ground bounce - maintains ±0.5% regulation accuracy under 30A load step. |
Applications
| Notebook CPU Core Power | ASIC/FPGA Core Supply |
|---|---|
Use Scenario: Delivering tightly regulated 1.5V/30A to Intel/AMD mobile processors during burst workloads with rapid load transients. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing interleaved gate drive timing, current sharing, and dynamic voltage scaling (DVS) response. Use Value: Achieves >90% efficiency at 10–30A loads while maintaining <20mV output deviation during 10A/µs load steps via differential sensing and fast current-mode loop. | Use Scenario: Powering high-performance FPGA core rails requiring precise voltage tracking across multiple supply domains (e.g., core, I/O, auxiliary). IC Role / Device Role / Timing Role: Master controller using TRACK pin to sequence and ratio-match outputs with companion LTC3709 units regulating auxiliary rails. Use Value: Enables sub-10mV inter-rail tracking error during startup and load changes - critical for avoiding I/O contention and latch-up in multi-voltage SoCs. |
| Graphics Processor VRM | High-Density Server DDR Memory Supply |
Use Scenario: Providing 1.2V/40A+ to discrete GPU cores with strict thermal and ripple constraints in thin-profile laptops. IC Role / Device Role / Timing Role: Two-phase controller operating at 300kHz with forced CCM (FCB = GND) to eliminate audible noise and ensure continuous current delivery. Use Value: Minimizes output capacitor ESR requirements and thermal stress on MOSFETs via interleaving - sustains 40A peak current without derating. | Use Scenario: Regulating DDR4/DDR5 memory VDD/VDDQ rails in compact server modules where board area and thermal density are constrained. IC Role / Device Role / Timing Role: Dual-phase controller leveraging VRNG pin to calibrate current sense threshold for low-RDS(ON) MOSFETs used in space-constrained layouts. Use Value: Eliminates need for precision current-sense resistors - saves 2–3mm² per phase and avoids 0.5W+ sense losses at 20A. |
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 |
|---|---|---|---|
| LTC3855IUHF#TRPBF | Single-output, dual-phase controller with integrated MOSFET drivers; supports up to 60A; lacks TRACK pin and true differential sensing. | Targeted at higher-current (>40A) applications where board space permits larger QFN; no native multi-rail sequencing capability. | Select when higher output current and integrated drivers outweigh need for precise rail coordination and remote sensing. |
| MP8765GL-Z | Monolithic dual-phase buck converter (integrated MOSFETs); fixed 0.6V reference; no VRNG or TRACK pins; max 25A per phase. | Used in cost-sensitive, space-constrained designs where external power stage complexity must be minimized. | Select when system-level integration (no external FETs) and BOM reduction are prioritized over programmability and sequencing flexibility. |
Compared with LTC3709EUH#TRPBF, LTC3855IUHF#TRPBF offers higher current capability but sacrifices tracking and differential sensing; MP8765GL-Z trades configurability for monolithic simplicity and lower component count - choice depends on whether design priority is precision multi-rail control, raw current capacity, or integration level.
Availability
LTC3709EUH#TRPBF is available at Aetrix Electronics and suitable for notebook CPU core power, ASIC/FPGA core supply, and graphics processor VRM applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +85°C.
Supply support for LTC3709EUH#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 the LTC portfolio.
The LTC3709EUH#TRPBF belongs to Linear's high-performance power management IC family, designed specifically for high-efficiency, multi-phase CPU/GPU/ASIC core supplies in portable and dense computing platforms.
FAQ
What is the minimum recommended input voltage for stable operation of the LTC3709EUH#TRPBF?
The LTC3709EUH#TRPBF has a specified input supply range of 4.5V to 28V for VCC/DRVCC. Stable operation requires VIN ≥ 4.5V to ensure proper UVLO release (3.9–4.2V threshold) and sufficient headroom for gate drive and internal biasing. Below 4.5V, the controller may fail to start or exhibit erratic switching behavior.
Can the LTC3709EUH#TRPBF operate without an external sense resistor?
Yes, the LTC3709EUH#TRPBF supports No RSENSE operation by using the RDS(ON) of synchronous MOSFETs as the current sense element. Connect SENSE+ to the switch node (SW) and SENSE– to the MOSFET source. This eliminates sense resistor losses and cost while maintaining accurate valley current control.
How does the VRNG pin affect current limit accuracy in the LTC3709EUH#TRPBF?
The VRNG pin sets the nominal current sense threshold as ≈VRNG/7.5 (e.g., 1.0V → 133mV). This directly determines the peak inductor current limit. Accuracy depends on VRNG voltage stability and matching between channels; typical variation is ±5% across temperature, translating to ±5% current limit tolerance when using matched MOSFETs.
What is the function of the INTLPF and EXTLPF pins on the LTC3709EUH#TRPBF?
INTLPF stabilizes the internal PLL that locks channel 2 to channel 1 with 180° phase shift. EXTLPF compensates the external PLL that synchronizes channel 1 to an external clock. Both require RC networks (e.g., 2–10kΩ + 10–100nF) for loop stability; improper filtering causes jitter or loss of lock.
Does the LTC3709EUH#TRPBF support discontinuous conduction mode (DCM)?
Yes, the LTC3709EUH#TRPBF supports DCM when the FCB pin is tied to VCC. In this mode, the second phase shuts down below ITH = 0.8V, reducing light-load losses. Reverse current is blocked, and operation transitions smoothly between CCM and DCM based on load current and ITH voltage.
LTC3709EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- 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:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3.9V ~ 37V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3709EUH#TRPBF FAQ
1.How can I place an order for LTC3709EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3709EUH#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 LTC3709EUH#TRPBF reliable?
The price and inventory of LTC3709EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3709EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3709EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3709EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3709EUH#TRPBF?
LTC3709EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3709EUH#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 LTC3709EUH#TRPBF?
For technical support, including LTC3709EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3709EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3709EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3709EUH#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 LTC3709EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3709EUH#TRPBF?
All LTC3709EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3709EUH#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 LTC3709EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3709EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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