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Analog Devices Inc. LTC3609EWKG#TRPBF
- Part No.:
- LTC3609EWKG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 52-VFQFN Exposed Pad
- Datasheet:
-
LTC3609EWKG#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,900
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Product details
Overview
LTC3609EWKG#TRPBF from Analog Devices (formerly Linear Technology) is a 32V, 6A monolithic synchronous step-down DC/DC converter with valley current mode control, ±1% 0.6V reference, and programmable on-time architecture. It delivers up to 6A output from 4V–32V input, supports forced continuous or discontinuous operation, and integrates internal N-channel MOSFETs for high-efficiency point-of-load regulation in industrial power supplies.
For engineers reviewing the LTC3609EWKG#TRPBF datasheet, LTC3609EWKG#TRPBF pinout, LTC3609EWKG#TRPBF application, or LTC3609EWKG#TRPBF equivalent, key selection criteria include its 100ns minimum on-time, adjustable current limit via VRNG, soft-start programmability, PGOOD monitoring, and 7mm × 8mm 52-pin QFN package with multiple PVIN/PGND/SW terminals for thermal and EMI optimization.
Technical Context
The LTC3609EWKG#TRPBF employs a constant on-time valley current mode control architecture that enables stable high-frequency operation across wide input-output voltage ratios. Its one-shot timer sets tON based on ION current and VON voltage, delivering inherently fast transient response and near-constant switching frequency over VIN and load variations.
Fault protection includes foldback current limiting, output overvoltage detection (±10% window), undervoltage lockout (3.4V–4.0V), and optional short-circuit shutdown timing. Power sequencing is supported via RUN/SS with 1.2µA soft-start charge current, while EXTVCC switchover (4.5V threshold) allows external 5V sourcing for improved efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 32V (36V absolute max); supports wide industrial and automotive supply rails without pre-regulation. |
| Output Current | Up to 6A continuous; enabled by integrated low-RDS(ON) N-MOSFETs (18mΩ top / 13mΩ bottom). |
| Reference Voltage | 0.6V ±1% over –40°C to 125°C; enables precise output setting with standard resistor dividers. |
| Min On-Time | ≤100ns; supports high step-down ratios (e.g., 24V→1.2V at 500kHz) without dropout. |
| Shutdown IQ | 15µA; minimizes standby power in battery-backed or always-on systems. |
| Switching Frequency | Adjustable via external RON; typical 500–600kHz with <±10% variation over line/load/temperature. |
| Power Good Threshold | ±10% output regulation window with hysteresis; provides reliable system enable signaling. |
Pinout & Package
Package: 7mm × 8mm, 52-pin plastic QFN with exposed thermal pad (WKG). Features multiple parallel PVIN, PGND, and SW pins for low-inductance high-current routing and enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1,2,3,4,5,6,7,48–53) | Main input supply connection | 13 dedicated input pins reduce trace resistance and inductance; must be decoupled directly to PGND with CIN. |
| SW (Pins 8,33,41–47,55) | Switch node | 10 parallel switch terminals handle high di/dt; connect to inductor and bootstrap capacitor (CB) negative terminal. |
| PGND (Pins 34–40) | Power ground return | 7 low-impedance paths for high-current return; must tie to CIN(–) and CVCC(–) at single point. |
| ITH (Pin 18) | Current threshold & compensation node | Direct interface to error amplifier output; sets valley current limit; used for loop compensation with external RC network. |
| VRNG (Pin 17) | Valley current limit range | 0.7V–1.2V input adjusts max valley current from ~9A to ~14A; determines IOUT(MAX) with ripple contribution. |
| RUN/SS (Pin 12) | Enable & soft-start control | 0.8V shutdown threshold; 1.2µA internal charge current enables programmable ramp time (~3s/µF) and latchoff delay. |
| PGOOD (Pin 16) | Open-drain power-good flag | Asserts low when VFB deviates >±10% from 0.6V; requires external pull-up for system sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Valley current mode control | Enables ultra-fast transient response and inherent stability with ceramic output capacitors-no external compensation required for basic designs. |
| Programmable minimum on-time | Configurable via ION resistor and VON voltage; maintains regulation down to 1.2V output from 24V input at 500kHz. |
| Discontinuous/forced continuous mode | Selectable via FCB pin; discontinuous mode improves light-load efficiency (>85% at 10mA), forced continuous reduces EMI in noise-sensitive applications. |
| Integrated MOSFET drivers | Eliminates need for external gate drivers or Schottky catch diodes; reduces BOM count and layout complexity in compact PoL designs. |
| EXTVCC switchover | Automatically switches INTVCC supply from internal LDO to external 4.7–7V source, reducing power loss and enabling secondary-side biasing. |
Applications
| Industrial PLC I/O Modules | Telecom Remote Radio Units |
|---|---|
Use Scenario: Regulating 3.3V/5V rails for FPGA configuration, ADC/DAC interfaces, and isolated communication peripherals in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 6A peak current during FPGA configuration burst, with PGOOD enabling safe FPGA reset sequencing. Use Value: 100ns min on-time prevents dropout during 24V-to-3.3V conversion under full load; multiple PVIN/PGND pins minimize voltage drop and thermal hotspots. | Use Scenario: Powering RF power amplifiers and analog front-end ICs in 4G/5G small cell base stations operating from –48V telecom supply via intermediate 12V bus. IC Role / Device Role / Timing Role: High-efficiency 12V-to-5V/3.3V step-down stage with forced continuous mode to suppress conducted EMI into sensitive RF sections. Use Value: Adjustable VRNG pin sets 9A current limit to accommodate PA burst currents; EXTVCC switchover enables efficient 5V bias from secondary winding. |
| Medical Imaging Sensor Arrays | Automotive ADAS Camera Modules |
Use Scenario: Supplying low-noise 1.8V/2.5V rails to CMOS image sensors and correlated double sampling circuits in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-ripple, high-transient-response regulator with soft-start to prevent sensor reset glitches during power-up. Use Value: Stable ceramic-capacitor operation eliminates electrolytic bulk caps; ±1% reference ensures consistent pixel gain calibration across temperature. | Use Scenario: Providing 1.2V core and 3.3V I/O supplies to SoCs and SerDes in surround-view camera ECUs exposed to 12V automotive battery transients. IC Role / Device Role / Timing Role: Input-robust buck converter with 36V abs-max rating and UVLO (3.4V) tolerating cold-crank and load-dump conditions. Use Value: 4V–32V input range covers full automotive battery envelope; PGOOD flag synchronizes SoC boot with stable rail presence. |
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 |
|---|---|---|---|
| MPQ4433AGL-A-Z | 4.5V–36V input, 3.5A output, fixed 500kHz fSW, no VRNG or ITH access | Lacks programmable current limit and compensation; suited for cost-sensitive, fixed-ratio applications only | Choose MPQ4433AGL-A-Z only if 3.5A output suffices and design does not require valley current adjustment or custom loop compensation. |
| TPS546B24RVFT | 4.5V–18V input, 15A output, PMBus interface, integrated telemetry, 3.5mm × 4.5mm QFN | Higher integration with digital control but narrower input range and no 32V capability | Choose TPS546B24RVFT only for digitally managed systems requiring telemetry and where input stays ≤18V. |
Compared with MPQ4433AGL-A-Z and TPS546B24RVFT, the LTC3609EWKG#TRPBF uniquely balances wide 4V–32V operation, 6A analog-programmable current limit, and direct ITH/VRNG/ION/VON access for precision analog power design-making it optimal for industrial and telecom PoL where input range, thermal robustness, and analog control matter most.
Availability
LTC3609EWKG#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, telecom remote radio units, medical imaging sensor arrays, and automotive ADAS camera modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3609EWKG#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 its legacy of high-performance analog power ICs with rigorous automotive and industrial qualification.
The LTC3609EWKG#TRPBF belongs to Linear's monolithic synchronous buck converter family designed for high-current, wide-input industrial and telecom point-of-load applications where efficiency, thermal performance, and analog programmability are critical.
FAQ
What is the maximum input voltage rating for the LTC3609EWKG#TRPBF?
The LTC3609EWKG#TRPBF has an absolute maximum input voltage rating of 36V across PVIN, SVIN, and ION pins. Its operational input range is specified from 4V to 32V, making it suitable for 24V industrial buses and telecom intermediate rails. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
How does the VRNG pin affect current limiting in the LTC3609EWKG#TRPBF?
The VRNG pin on the LTC3609EWKG#TRPBF sets the maximum valley current limit between ~9A (0.7V) and ~14A (1.2V) via an external resistive divider from INTVCC. This directly determines the achievable IOUT(MAX) = IVALLEY(MAX) + ½ΔIL, enabling safe derating for thermal constraints without changing external components.
Can the LTC3609EWKG#TRPBF operate with ceramic output capacitors only?
Yes, the LTC3609EWKG#TRPBF is explicitly designed for stable operation with ceramic output capacitors. Its valley current mode control and internal compensation eliminate the need for ESR-based damping, allowing low-ESR, high-reliability ceramic solutions-reducing size, cost, and failure risk versus electrolytic alternatives.
What is the purpose of the ION and VON pins on the LTC3609EWKG#TRPBF?
The ION and VON pins jointly configure the one-shot on-time timer in the LTC3609EWKG#TRPBF: ION current (set by RON from VIN) and VON voltage (0.7V–2.4V clamped) determine tON = (10pF × VVON)/IION. This enables precise, load- and line-stable frequency programming-critical for EMI compliance and thermal management.
Does the LTC3609EWKG#TRPBF support power sequencing with other ICs?
Yes, the LTC3609EWKG#TRPBF supports robust power sequencing via its RUN/SS pin (programmable enable/soft-start) and open-drain PGOOD output. The PGOOD signal asserts high only when VFB is within ±10% of 0.6V, enabling safe, cascaded startup of downstream FPGAs, processors, or ADCs without external supervisors.
LTC3609EWKG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 32V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 32V
- Current - Output:
- 6A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-QFN-Multipad (7x8)
LTC3609EWKG#TRPBF FAQ
1.How can I place an order for LTC3609EWKG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3609EWKG#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 LTC3609EWKG#TRPBF reliable?
The price and inventory of LTC3609EWKG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3609EWKG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3609EWKG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3609EWKG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3609EWKG#TRPBF?
LTC3609EWKG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3609EWKG#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 LTC3609EWKG#TRPBF?
For technical support, including LTC3609EWKG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3609EWKG#TRPBF requirements.
6.How does Aetrix verify that LTC3609EWKG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3609EWKG#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 LTC3609EWKG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3609EWKG#TRPBF?
All LTC3609EWKG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3609EWKG#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 LTC3609EWKG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3609EWKG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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