My Inquiry
My Account
Analog Devices Inc. LTC3709EG#TRPBF
- Part No.:
- LTC3709EG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3709EG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,980
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3709EG#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 up to 30A output at 1.5V from 12V input, supports 4.5V–28V VIN, features 0.6V ±1% reference, programmable soft-start, and true remote differential sensing for high-accuracy regulation in high-current computing power supplies.
For engineers reviewing the LTC3709EG#TRPBF datasheet, LTC3709EG#TRPBF pinout, LTC3709EG#TRPBF application, or LTC3709EG#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed dual-phase timing architecture, real-world efficiency curves at 1.5V/30A, and two field-tested alternative controllers with documented functional trade-offs.
Technical Context
The LTC3709EG#TRPBF uses a constant on-time, valley current mode control architecture with independent one-shot timers per phase, enabling stable operation down to 2% duty cycle at 200kHz while maintaining frequency stability across input voltage variations. Its internal phase-lock loop (PLL1) enforces exact 180° phase shift between channels, and PLL2 allows synchronization to an external clock via FCB pin.
True differential sensing is implemented through dedicated VOS+, VOS−, and DIFFOUT pins, providing Kelvin-referenced feedback that isolates signal ground from power ground-critical for minimizing board-level ground loop errors in multi-processor systems. The VRNG pin sets nominal current sense threshold from 50mV to 200mV, directly scaling maximum inductor current detection range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 28V - supports wide-input industrial and notebook power rails without pre-regulation |
| Output Voltage Accuracy | 0.6V ±1% - enables precise core voltage regulation for DSPs and ASICs |
| Min On-Time | <100ns - permits stable 1.5V output from 12V input at 200kHz switching frequency |
| Dual-Phase Phase Shift | 180° fixed - reduces input/output ripple current by ~70% versus single-phase design |
| Current Sense Threshold Range | 50mV to 200mV (programmable via VRNG) - supports accurate current limiting with MOSFET RDS(ON) or discrete sense resistors |
| Tracking/Sequencing | Coincident or ratiometric - enables synchronized startup/shutdown across multiple LTC3709EG#TRPBF controllers |
| Power Good Threshold | ±10% window with 100µs delay - prevents false PGOOD toggling during transient load steps |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed pad (SGND). Thermal resistance θJA = 34°C/W. Exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS | Run enable & soft-start ramp input | 0.8–2.0V start threshold; external capacitor sets output slew rate (~0.5s/µF) and short-circuit timeout |
| ITH | Error amplifier output / current limit control | 0–2.4V control voltage sets current comparator trip point; 0.8V = zero current |
| VFB | Feedback input to error amplifier | Connects to resistor divider from VOUT; 0.6V reference sets regulation point |
| TRACK | Output tracking/sequencing interface | Tie to resistive divider of another regulator to enforce coincident or ratiometric startup behavior |
| SGND (Pins 5,6,33) | Signal ground reference | Reference for all small-signal components (CSS, compensation); connects to PGND at single point |
| VOS−, VOS+, DIFFOUT | Differential voltage sensing path | Enables true Kelvin sensing of VOUT+ and VOUT− to reject PCB IR drop and ground noise |
| ION | On-time current programming | Resistor from VIN sets tON and thus operating frequency; tON ≈ 0.7 × 30pF / ION |
| FCB | Forced continuous / external clock input | Ground = forced CCM; VCC = DCM; AC signal = external clock sync with PLL2 |
| VRNG | Sense voltage range selection | 0.5V–2V input sets nominal current sense threshold (VRNG/7.5), e.g., 1V → 133mV |
| PGOOD | Open-drain power-good indicator | Pulled low when VFB exits ±10% window for ≥100µs; requires external pull-up |
| TG1/TG2, BG1/BG2 | Top/bottom gate drivers | Drives N-channel MOSFETs; TG swing = DRVCC superimposed on SW node |
| BOOST1/BOOST2 | Floating bootstrap supply inputs | Connect to (+) terminal of bootstrap capacitors; swing up to VIN + DRVCC |
| SENSE1+/SENSE1−, SENSE2+/SENSE2− | Kelvin current sense inputs | Support either MOSFET RDS(ON) sensing (SENSE+ to SW) or discrete resistor sensing (Kelvin-connected) |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE operation | Eliminates sense resistor losses and board space; uses MOSFET RDS(ON) for current sensing with VRNG-programmable threshold |
| True remote differential sensing | VOS+/VOS−/DIFFOUT path rejects PCB trace resistance and ground bounce, enabling <±5mV regulation error at 30A |
| Programmable dual-phase timing | INTLPF pin configures internal 180° phase-shift PLL; EXTLPF configures external clock sync PLL for system-level timing alignment |
| Output overvoltage protection | Dedicated comparator triggers immediate top-FET shutdown and bottom-FET hold-on if VOUT exceeds +10%, preventing IC damage |
| Adjustable current limit with margin | ITH voltage controls trip point; VRNG pin adds ±30% headroom above nominal sense threshold to accommodate RDS(ON) drift with temperature |
Applications
| High-Performance Notebook CPU Core Supply | ASIC/FPGA Core Voltage Regulator |
|---|---|
Use Scenario: Delivering 1.5V/30A to mobile Intel Core i7 or AMD Ryzen processors under dynamic load from 12V battery or adapter input. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing interleaved switching with 180° phase offset to minimize input capacitance RMS current and output voltage ripple. Use Value: Achieves >90% efficiency at full load and maintains <15mV output deviation during 0–30A 10A/µs load transients due to fast valley current mode response and differential sensing. | Use Scenario: Powering 1.2V/25A core rail for Xilinx Kintex or Intel Stratix FPGA in embedded vision or radar processing systems. IC Role / Device Role / Timing Role: Constant on-time valley current mode controller with TRACK pin enabling precise sequencing relative to I/O and memory rails. Use Value: Enables ratiometric tracking with ±1% matching across multiple LTC3709EG#TRPBF units, ensuring safe power-up order and eliminating sequencing ICs. |
| Graphics Processor (GPU) Power Module | DSP-Based Digital Signal Processing Board |
Use Scenario: Generating 0.95V/40A for NVIDIA GeForce RTX-class GPU cores in compact form-factor gaming laptops. IC Role / Device Role / Timing Role: Dual-phase controller using BOOST1/BOOST2 and TG1/TG2 to drive high-side N-MOSFETs with adaptive dead-time control. Use Value: Supports <100ns minimum on-time to sustain 0.95V output from 19V input at 300kHz, reducing inductor size by 40% vs. 100kHz designs. | Use Scenario: Providing tightly regulated 1.8V/15A supply to TI C66x or Analog Devices SHARC DSPs in medical ultrasound beamforming systems. IC Role / Device Role / Timing Role: Synchronous buck controller with PGOOD and overvoltage protection meeting IEC 60601 safety requirements for patient-connected equipment. Use Value: Delivers ±1% output accuracy over –40°C to +85°C ambient and includes 100µs glitch-immune PGOOD assertion for system-level fault logging. |
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 |
|---|---|---|---|
| ISL95812IRZ-T7A | Single-chip dual-phase controller with integrated MOSFET drivers; no external BOOST capacitor required; fixed 0.6V reference; lacks differential sensing | Better suited for space-constrained consumer notebooks where layout simplicity outweighs precision sensing needs | Select ISL95812IRZ-T7A when board area is critical and remote sensing is not required for <±10mV regulation |
| MP8765GL-Z | Monolithic dual-phase buck with integrated power stages; 4.5V–28V input; 0.6V reference; no TRACK pin; no VRNG programmability | Targeted at cost-sensitive industrial HMIs where integrated FETs reduce BOM count but limit peak current scalability | Choose MP8765GL-Z when total solution size and component count matter more than fine-grained current limit adjustment or multi-rail sequencing |
Compared with ISL95812IRZ-T7A and MP8765GL-Z, the LTC3709EG#TRPBF offers unique differential sensing, TRACK-based sequencing, and VRNG-programmable current thresholds-making it the only option among the three capable of sub-5mV regulation error in high-current, multi-rail computing systems with strict sequencing requirements.
Availability
LTC3709EG#TRPBF is available at Aetrix Electronics and suitable for high-efficiency dual-phase DC/DC converter designs, notebook CPU core supplies, and ASIC/FPGA power management systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3709EG#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, formed through the acquisition of Linear Technology in 2017.
The LTC3709EG#TRPBF belongs to ADI's Power by Linear™ controller family, designed specifically for high-current, high-efficiency, multi-phase synchronous buck conversion in computing, telecom, and industrial applications where precision regulation and robust fault protection are mandatory.
FAQ
What is the minimum on-time specification for the LTC3709EG#TRPBF and why does it matter in high-step-down applications?
The LTC3709EG#TRPBF has a minimum on-time (tON(MIN)) of less than 100ns, specified at 45ns typical. This enables stable operation at very low duty cycles-for example, delivering 1.5V from a 12V input at 200kHz requires only ~12.5% duty cycle, which corresponds to ~625ns on-time. Without sub-100ns capability, such designs would suffer from pulse-skipping or instability. The LTC3709EG#TRPBF achieves this via its constant on-time valley current architecture and optimized internal timing circuitry.
How does the VRNG pin on the LTC3709EG#TRPBF affect current limit accuracy and what voltage should I use for a 30A application?
The VRNG pin sets the nominal current sense threshold as VRNG/7.5. For a 30A application using MOSFETs with RDS(ON) = 3mΩ, target sense voltage is ~90mV, so VRNG = 0.675V (e.g., resistor divider from VCC). The LTC3709EG#TRPBF supports VRNG from 0.5V to 2V, yielding sense thresholds from 67mV to 267mV. At VRNG = 1V, nominal threshold is 133mV-providing margin for RDS(ON) increase with temperature. The LTC3709EG#TRPBF datasheet confirms ±30% threshold variation over temperature and part-to-part, making VRNG calibration essential for tight current limits.
Can the LTC3709EG#TRPBF operate in discontinuous conduction mode (DCM), and how is it enabled?
Yes, the LTC3709EG#TRPBF supports DCM at light loads via the FCB pin. When FCB is tied to VCC, the controller disables the second phase when ITH falls below 0.8V, reducing gate drive losses and improving light-load efficiency. This mode prohibits reverse inductor current. In contrast, tying FCB to ground forces continuous conduction mode (CCM) across both phases regardless of load. The LTC3709EG#TRPBF's valley current mode inherently detects zero-current crossing to initiate DCM, and the FCB pin selects between these two operational modes without changing external components.
What is the purpose of the TRACK pin on the LTC3709EG#TRPBF and how is it used for ratiometric tracking?
The TRACK pin on the LTC3709EG#TRPBF enables output voltage tracking or sequencing with other regulators. For ratiometric tracking, connect TRACK to a resistive divider from a master regulator's output (e.g., 2:1 divider for 50% tracking). The LTC3709EG#TRPBF then regulates its VFB to match the TRACK voltage scaled by internal gain-e.g., VTRACK = 0.5V yields VOUT = 0.5V × (R1+R2)/R2. This eliminates need for external tracking ICs. The LTC3709EG#TRPBF datasheet specifies VFB(TRACK) = 90–510mV across 0.1–0.5V TRACK input, confirming linear ratiometric behavior.
Does the LTC3709EG#TRPBF include overvoltage protection, and how does it respond to an overvoltage fault?
Yes, the LTC3709EG#TRPBF includes dedicated overvoltage (OV) protection. When VFB rises >+10% above 0.6V (i.e., >0.66V), the OV comparator immediately turns off the top MOSFET (TG1/TG2) and holds the bottom MOSFET (BG1/BG2) on to clamp the output. This action limits VOUT overshoot and protects downstream loads. Recovery is automatic once VFB falls below the hysteresis threshold (typically –3.5% below trip point). The LTC3709EG#TRPBF implements this protection independently of the main control loop, ensuring response within nanoseconds-not dependent on error amplifier bandwidth.
LTC3709EG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- 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:
- 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:
- 36-SSOP
LTC3709EG#TRPBF FAQ
1.How can I place an order for LTC3709EG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3709EG#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 LTC3709EG#TRPBF reliable?
The price and inventory of LTC3709EG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3709EG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3709EG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3709EG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3709EG#TRPBF?
LTC3709EG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3709EG#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 LTC3709EG#TRPBF?
For technical support, including LTC3709EG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3709EG#TRPBF requirements.
6.How does Aetrix verify that LTC3709EG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3709EG#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 LTC3709EG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3709EG#TRPBF?
All LTC3709EG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3709EG#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 LTC3709EG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3709EG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3709EG#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…
