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Analog Devices Inc. LTC3609IWKG#TRPBF
- Part No.:
- LTC3609IWKG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 52-VFQFN Exposed Pad
- Datasheet:
-
LTC3609IWKG#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,999
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Product details
Overview
LTC3609IWKG#TRPBF from Analog Devices (formerly Linear Technology) is a 32V input, 6A monolithic synchronous step-down DC/DC converter with valley current mode control, ±1% 0.6V reference, and programmable on-time architecture. It delivers regulated output from 4V to 32V input (36V abs max), supports forced continuous or discontinuous operation, and integrates dual N-channel MOSFETs in a 7mm × 8mm QFN-52 package for point-of-load power delivery in industrial and telecom systems.
For engineers reviewing the LTC3609IWKG#TRPBF datasheet, LTC3609IWKG#TRPBF pinout, LTC3609IWKG#TRPBF application, or LTC3609IWKG#TRPBF equivalent, key selection criteria include its 100ns minimum on-time, adjustable current limit via VRNG pin, power good monitoring, soft-start programmability, and stable ceramic output capacitor support - all critical for high-step-down-ratio, fast-transient embedded power rails.
Technical Context
The LTC3609IWKG#TRPBF employs a constant on-time, valley current mode control architecture that enables ultra-fast transient response and stable operation across wide VIN/VOUT ratios. Its one-shot timer sets tON based on ION current and VON voltage, enabling frequency regulation independent of input variation.
Fault protection includes foldback current limiting, output overvoltage detection (±10% window), undervoltage lockout (3.4V–3.5V), and optional short-circuit shutdown timing. Power sequencing is supported via RUN/SS pin with 1.2µA soft-start charge current and latch-off thresholds at 4.0V (rising) and 3.5V (falling).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 32V (36V absolute max); supports wide industrial and telecom supply rails without external 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; allows high step-down ratios (e.g., 24V→1.2V) at high switching frequencies without dropout. |
| Shutdown IQ | 15µA; minimizes system standby power loss in battery-backed or energy-sensitive applications. |
| PGOOD Threshold | ±10% output regulation window with hysteresis; provides reliable power sequencing and fault signaling. |
| Operating Temp | –40°C to +125°C junction; qualified for extended-temperature industrial and automotive under-hood use. |
Pinout & Package
Package: 52-pin WKG (7mm × 8mm) QFN with exposed thermal pad; designed for high-power density and efficient heat dissipation in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1–7, 48–53) | Main input power supply connection | Multiple parallel pins reduce IR drop and thermal resistance; must be decoupled directly to PGND with low-ESR CIN. |
| SW (Pins 8, 33, 41–47, 55) | Switch node | High dv/dt node connecting to inductor and bootstrap capacitor; requires tight layout to minimize EMI and ringing. |
| PGND (Pins 34–40) | Power ground return | Dedicated low-impedance path for high-current switch return; must connect to CIN and CVCC cathodes at single point. |
| ITH (Pin 18) | Error amplifier compensation & current threshold | Voltage-controlled valley current setpoint (0–2.4V); also serves as loop compensation node for stability tuning. |
| VRNG (Pin 17) | Current limit range select | Analog-adjustable maximum valley current (0.7V–1.2V input → ~9A–14A limit); prevents thermal runaway during overload. |
| RUN/SS (Pin 12) | Enable & soft-start control | 1.2µA internal current source charges external capacitor; 1.5V threshold initiates startup with clamped ITH soft-limit. |
| PGOOD (Pin 16) | Open-drain power-good indicator | Asserts low when VFB exits ±10% regulation window; compatible with FPGA/CPU reset inputs and sequencer logic. |
Key Features
| Feature | Design Value |
|---|---|
| Valley current mode control | Enables stable ceramic-capacitor operation and eliminates need for external current-sense resistors. |
| Programmable switching frequency | Set via RON from VIN to ION pin; maintains near-constant fSW across input voltage changes. |
| Discontinuous/forced continuous mode | Selectable via FCB pin; balances light-load efficiency (DCM) vs EMI/noise performance (CCM). |
| Adjustable current limit | VRNG pin scales maximum valley current from 9A to 14A; avoids overdesign while ensuring robust short-circuit protection. |
| Integrated bootstrap driver | Eliminates external diode and capacitor; reduces BOM count and improves gate drive reliability at high duty cycles. |
| EXTVCC support | Accepts external 4.7–7V supply to power INTVCC; improves efficiency by bypassing internal LDO under high-load conditions. |
Applications
| Industrial PLC I/O Modules | Telecom Base Station RF Power Supplies |
|---|---|
|
Use Scenario: Regulating 12V intermediate bus to 3.3V/1.8V for FPGA, ADCs, and interface ICs in harsh factory environments. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 6A with fast load-step response (<20µs) and thermal robustness up to 125°C. Use Value: Eliminates need for external current sensing and Schottky diode; reduces solution size by >30% vs discrete controllers. |
Use Scenario: Generating stable 5V/3.3V rails for RF transceivers and digital front-end ASICs in 4G/5G macro base stations. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter supporting 24V/48V input with <100ns min on-time for low-VOUT operation. Use Value: Maintains >90% efficiency at full load across 12V–32V input range; PGOOD enables safe power-up sequencing with BBUs. |
| Automotive ADAS Camera Power | Network Equipment Line Cards |
|
Use Scenario: Supplying 1.2V core voltage to image signal processors (ISPs) in rear-view and surround-view camera modules. IC Role / Device Role / Timing Role: Compact, thermally optimized DC/DC with programmable soft-start to prevent inrush-induced brownouts during cold cranking. Use Value: Stable ceramic-capacitor output meets automotive ripple requirements (<20mVpp); -40°C to 125°C rating ensures AEC-Q200 compatibility. |
Use Scenario: Providing isolated 12V-to-5V conversion for packet processing units and PHY interfaces on line cards with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous buck controller with selectable DCM/CCM mode to meet CISPR-22 Class B conducted emissions targets. Use Value: Forced continuous mode suppresses subharmonic noise; integrated MOSFETs reduce layout sensitivity and improve yield. |
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 |
|---|---|---|---|
| MPQ4470AGL-Z (Monolithic Power) | 4.5–36V input, 6A, fixed 500kHz fSW, no VRNG or ION programming; smaller 4×4mm QFN-21 package. | Lacks analog current limit adjustment and programmable frequency; suited for cost-sensitive, fixed-ratio designs. | Choose MPQ4470AGL-Z only if design does not require valley current scaling, soft-start tuning, or wide fSW optimization. |
| TPS546B24RVFT (Texas Instruments) | 4–18V input, 10A, PMBus-enabled, 0.5% ref accuracy, integrated telemetry; 5×5mm QFN-32 package. | Requires external PMBus host; higher precision but narrower input range and no 32V capability. | Choose TPS546B24RVFT when digital monitoring, tighter VREF tolerance, or higher current is required - not for 24V+ industrial inputs. |
Compared with MPQ4470AGL-Z and TPS546B24RVFT, the LTC3609IWKG#TRPBF uniquely combines 32V input tolerance, analog-programmable current limit (VRNG), and sub-100ns on-time for ultra-high step-down ratios - making it irreplaceable in 24V/48V distributed power systems requiring analog flexibility and thermal resilience.
Availability
LTC3609IWKG#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, telecom base station power supplies, automotive ADAS camera modules, and network line cards requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3609IWKG#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 and power management ICs with rigorous qualification standards and long-term product availability commitments.
The LTC3609IWKG#TRPBF belongs to Linear's monolithic synchronous buck converter family, engineered for high-efficiency, high-current point-of-load regulation in space-constrained, thermally demanding applications where reliability and analog configurability are critical.
FAQ
What is the absolute maximum input voltage rating for the LTC3609IWKG#TRPBF?
The LTC3609IWKG#TRPBF has an absolute maximum input voltage of 36V applied to PVIN, SVIN, and ION pins. Operation above 32V is permissible only for short-duration transients; continuous operation beyond 32V violates the recommended operating conditions and may impact long-term reliability. The device includes undervoltage lockout (UVLO) that disables switching below 3.4V.
How does the VRNG pin affect current limiting in the LTC3609IWKG#TRPBF?
The VRNG pin on the LTC3609IWKG#TRPBF sets the maximum valley current limit by accepting a 0.7V–1.2V analog voltage. At 0.7V, typical maximum valley current is 9A; at 1.2V, it rises to 14A. This directly scales the peak inductor current and thus the deliverable output current, allowing designers to match the limit precisely to thermal and safety requirements without overdesign.
Can the LTC3609IWKG#TRPBF operate with ceramic output capacitors only?
Yes, the LTC3609IWKG#TRPBF is explicitly designed for stable operation with ceramic output capacitors. Its valley current mode control architecture eliminates the need for ESR-based compensation, and the datasheet confirms stability with ≥10µF ceramic COUT. No tantalum or electrolytic bulk capacitance is required for basic functionality.
What is the purpose of the FCB pin on the LTC3609IWKG#TRPBF?
The FCB (Forced Continuous Bias) pin on the LTC3609IWKG#TRPBF selects light-load operation mode: grounding FCB forces continuous conduction mode (CCM) to reduce EMI, while tying FCB to INTVCC enables discontinuous conduction mode (DCM) for higher light-load efficiency. The threshold is 0.54V–0.66V, with hysteresis preventing chatter near the transition point.
Does the LTC3609IWKG#TRPBF support external clock synchronization?
No, the LTC3609IWKG#TRPBF does not support external clock synchronization. Its switching frequency is determined solely by the ION current and VON voltage via the internal one-shot timer. There is no SYNC pin or phase-lock capability; frequency is programmable but asynchronous to external clocks.
LTC3609IWKG#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)
LTC3609IWKG#TRPBF FAQ
1.How can I place an order for LTC3609IWKG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3609IWKG#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 LTC3609IWKG#TRPBF reliable?
The price and inventory of LTC3609IWKG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3609IWKG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3609IWKG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3609IWKG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3609IWKG#TRPBF?
LTC3609IWKG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3609IWKG#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 LTC3609IWKG#TRPBF?
For technical support, including LTC3609IWKG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3609IWKG#TRPBF requirements.
6.How does Aetrix verify that LTC3609IWKG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3609IWKG#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 LTC3609IWKG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3609IWKG#TRPBF?
All LTC3609IWKG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3609IWKG#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 LTC3609IWKG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3609IWKG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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