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Analog Devices Inc. LTC3309BIV#TRPBF
- Part No.:
- LTC3309BIV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309BIV#TRPBF.pdf
- Description:
- IC REG BUCK 6A
- Quantity:
- Payment:
- Shipping:
Inventory:3,046
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Product details
Overview
LTC3309BIV#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 6A output at 1.8V from 2.5–5.5V input, featuring 6.6MHz default switching frequency, 22ns minimum on-time, ±1% VOUT accuracy over temperature, and Silent Switcher architecture for ultralow EMI in optical networking power supplies.
For engineers reviewing the LTC3309BIV#TRPBF datasheet, LTC3309BIV#TRPBF pinout, LTC3309BIV#TRPBF application, or LTC3309BIV#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specs, and real-world mode-selection trade-offs for POL designs requiring fast transient response and AEC-Q100-compliant operation.
Technical Context
The LTC3309BIV#TRPBF uses constant-frequency peak current mode control with internal compensation, supporting programmable 3–10MHz switching via RT resistor or external clock synchronization on MODE/SYNC. Its 22ns minimum on-time enables high VIN/VOUT ratios (e.g., 5.5V→1.8V at 6.6MHz) without pulse skipping artifacts.
It integrates dual MOSFETs (31mΩ PMOS top switch, 8mΩ NMOS bottom switch), supports forced continuous, pulse-skip, and low-ripple Burst Mode® operation, and includes precision 400mV EN threshold, 500mV FB reference, and PGOOD with ±1.2% hysteresis and 120µs delay - all operating across –40°C to +125°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and intermediate bus rails without pre-regulation. |
| IOUT Max | 6A continuous - sufficient for FPGA core, ASIC I/O, or µP VDDQ rails with margin. |
| fSW Default | 6.6MHz (±300kHz) - enables <1µH inductors and sub-10µF output capacitance in space-constrained 2mm × 2mm layouts. |
| VFB Accuracy | ±1% over –40°C to +125°C - ensures stable 0.5V–5.5V output regulation without calibration. |
| tON,min | 22ns (typ) - allows >90% duty cycle at 6.6MHz for low-dropout operation down to ~2.25V input. |
| EMI Performance | Silent Switcher™ architecture - reduces radiated emissions by >20dB vs conventional buck converters at 100MHz. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on automotive infotainment modules. |
| Thermal Rating | θJA = 51°C/W, TJMAX = 125°C (I-grade) - supports sustained 6A load in compact PCB footprints with exposed PGND pad. |
Pinout & Package
Package: 12-lead 2mm × 2mm × 0.74mm LQFN with exposed PGND pad (Pin 13), optimized for thermal dissipation and EMI suppression in high-density POL applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB; must connect directly to output capacitor negative terminal to reject PCB IR drop. |
| EN (2) | Enable control input | 400mV precision threshold with 50mV hysteresis - enables sequencing from upstream rail or microcontroller GPIO. |
| VIN (3,8) | Main power input | Dual high-current paths for internal logic and top switch; requires parallel low-ESR ceramic bypassing to PGND/AGND. |
| PGND (4,7,13) | Power ground return | Primary thermal and electrical path for bottom switch; exposed pad must be soldered to ≥4 thermal vias to internal ground plane. |
| SW (5,6) | Switch node | High dv/dt node connecting internal FETs to external inductor; requires shortest possible trace to minimize EMI and ringing. |
| MODE/SYNC (9) | Mode selection & sync input | Configures operation mode (low = pulse skip, float = forced continuous, high = Burst Mode) or accepts 3–10MHz external clock. |
| RT (10) | Frequency programming | Resistor-to-AGND sets fSW from 3–10MHz; open or tied to VIN selects default 6.6MHz oscillator. |
| PGOOD (11) | Open-drain status output | Asserts high-Z when VOUT is within –2%/+10% of target; pulls low during UVLO, shutdown, OV, or thermal fault. |
| FB (12) | Feedback input | Regulates to 500mV; connects to resistor divider from VOUT to AGND - determines final output voltage with ±1% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher™ architecture | Integrated dual-loop layout minimizes magnetic field coupling, enabling CISPR 22 Class B compliance without shielding. |
| Low-ripple Burst Mode® | 40µA IQ with <10mVPP output ripple at light loads - eliminates audible noise while maintaining tight regulation for sensor bias rails. |
| 100% duty cycle capability | Enables dropout operation down to VIN ≈ VOUT + IOUT × RDS(ON)_PMOS - critical for battery-powered systems near end-of-discharge. |
| Inductor saturation tolerance | Internal valley-current limit (7.8A) prevents destructive current runaway during overload or short-circuit events. |
| AEC-Q100 qualified (I-grade) | Validated for automotive ambient temperatures up to +125°C - suitable for ADAS camera modules and infotainment SoC supplies. |
| Internal soft-start (0.25–3ms) | Programmable ramp time limits inrush current into bulk capacitors - prevents input rail collapse during hot-plug events. |
Applications
| Optical Networking Transceiver Power | FPGA Core Voltage Supply |
|---|---|
|
Use Scenario: Powers 100G/400G QSFP-DD transceivers requiring clean, low-noise 1.8V/3.3V rails in dense line cards. IC Role / Device Role / Timing Role: Primary POL regulator delivering 6A at 1.8V with <10mV ripple and <1µs transient recovery. Use Value: Silent Switcher architecture meets stringent EMI limits for co-located laser drivers and high-speed SerDes without ferrite beads. |
Use Scenario: Supplies configurable logic fabric and DSP blocks in Xilinx Versal or Intel Agilex FPGAs. IC Role / Device Role / Timing Role: High-bandwidth step-down converter with 22ns min-on-time enabling 0.8V–1.2V outputs from 3.3V intermediate bus. Use Value: Forced continuous mode maintains fixed 6.6MHz switching for predictable EMI spectrum and minimal output voltage deviation under dynamic load steps. |
| Automotive Infotainment SoC Rail | Distributed Telecom POL System |
|
Use Scenario: Generates 1.1V core voltage for ARM-based telematics processors in dashboards and head units. IC Role / Device Role / Timing Role: AEC-Q100 qualified buck converter with 40µA Burst Mode IQ and thermal shutdown at 165°C. Use Value: Enables always-on functionality with <50µA system standby current while surviving automotive load-dump transients. |
Use Scenario: Provides point-of-load conversion for baseband processing units in 5G macrocell radios. IC Role / Device Role / Timing Role: Synchronized 6.6MHz operation across multiple LTC3309BIV#TRPBF units to avoid beat frequencies in multi-rail systems. Use Value: MODE/SYNC pin allows deterministic clock alignment - eliminating inter-rail interference in time-sensitive RF front-end power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3307EDE#TRPBF | 3A rated, same 2mm × 2mm LQFN package, 3–6MHz fSW range, higher 50mΩ PMOS RDS(ON) | Lower current capacity; unsuitable for >4A FPGA cores but fits tighter thermal budgets in space-constrained modules. | Select when 3A output suffices and board area is identical - pin-compatible with shared layout footprint. |
| TPS546B24RVFT | 6A, 2.95–16V input, 300kHz–2.2MHz fSW, external compensation, no Burst Mode, higher 125°C TJ rating | Wider VIN range and adjustable loop compensation - better for industrial 12V intermediate buses but lacks ultralow-IQ sleep mode. | Choose for non-battery systems needing flexibility in loop tuning or higher input voltage; not drop-in due to different pinout and control scheme. |
Compared with LTC3307EDE#TRPBF and TPS546B24RVFT, the LTC3309BIV#TRPBF uniquely combines 6A output, 6.6MHz fixed-frequency operation, Silent Switcher EMI reduction, and 40µA Burst Mode IQ in a 2mm × 2mm footprint - making it optimal for high-density, low-noise, battery-aware POL designs where layout area and standby power are critical.
Availability
LTC3309BIV#TRPBF is available at Aetrix Electronics and suitable for optical networking transceivers, automotive infotainment SoCs, and 5G telecom POL systems requiring stable component supply, AEC-Q100 qualification, and ultralow EMI performance.
Supply support for LTC3309BIV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and automotive markets since 1965.
The LTC3309BIV#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters, engineered specifically for high-efficiency, low-EMI point-of-load regulation in space- and noise-sensitive applications like optical modules and ADAS systems.
FAQ
What is the maximum output current capability of the LTC3309BIV#TRPBF?
The LTC3309BIV#TRPBF delivers up to 6A continuous output current at 1.8V with 2.5–5.5V input, verified across –40°C to +125°C junction temperature. Its 31mΩ PMOS and 8mΩ NMOS switches, combined with the thermally enhanced 2mm × 2mm LQFN package and exposed PGND pad, sustain this rating under forced-air or moderate PCB copper area conditions per θJA = 51°C/W.
How does the MODE/SYNC pin configure operating modes on the LTC3309BIV#TRPBF?
The MODE/SYNC pin on the LTC3309BIV#TRPBF selects three distinct modes: grounding enables pulse-skip mode for low-noise light-load operation; floating enables forced continuous mode for fixed-frequency, minimal-ripple performance; tying to VIN activates low-ripple Burst Mode® with 40µA quiescent current. It also accepts 3–10MHz external clocks for synchronized multi-rail systems.
Can the LTC3309BIV#TRPBF operate with input voltages below 2.5V?
Yes - the LTC3309BIV#TRPBF operates from 2.25V to 5.5V input. At 2.25V, its 22ns minimum on-time supports 1.8V output at 6.6MHz (duty cycle ≈ 27%), and its 100% duty cycle capability allows dropout operation down to VIN ≈ VOUT + IOUT × RDS(ON)_PMOS. Verified performance data confirms stable regulation and thermal behavior across the full range.
What is the purpose of the AGND pin on the LTC3309BIV#TRPBF, and how should it be routed?
The AGND pin on the LTC3309BIV#TRPBF serves as both the remote output voltage sense return and the analog ground reference for the error amplifier and FB circuitry. It must be connected directly to the negative terminal of the output capacitor at the load - not to the local PGND - to reject PCB trace resistance and ensure ±1% output accuracy under load transients.
Does the LTC3309BIV#TRPBF include protection features beyond overcurrent and thermal shutdown?
Yes - the LTC3309BIV#TRPBF integrates output overvoltage protection (shuts off top switch if FB exceeds 110% of target), input undervoltage lockout (2.0V rising threshold with 150mV hysteresis), short-circuit recovery with valley-current limiting, and PGOOD monitoring with built-in 120µs delay and ±1.2% hysteresis - all active across its full –40°C to +125°C operating range.
LTC3309BIV#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 12-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3309BIV#TRPBF FAQ
1.How can I place an order for LTC3309BIV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309BIV#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 LTC3309BIV#TRPBF reliable?
The price and inventory of LTC3309BIV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309BIV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3309BIV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309BIV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309BIV#TRPBF?
LTC3309BIV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309BIV#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 LTC3309BIV#TRPBF?
For technical support, including LTC3309BIV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309BIV#TRPBF requirements.
6.How does Aetrix verify that LTC3309BIV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309BIV#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 LTC3309BIV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3309BIV#TRPBF?
All LTC3309BIV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309BIV#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 LTC3309BIV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3309BIV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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