My Inquiry
My Account
Analog Devices Inc. LTC3609IWKG#PBF
- Part No.:
- LTC3609IWKG#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 52-VFQFN Exposed Pad
- Datasheet:
-
LTC3609IWKG#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:689
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3609IWKG#PBF 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–32V input (36V abs max), supports forced continuous or discontinuous operation, and integrates dual N-channel MOSFETs for high efficiency in point-of-load applications such as FPGA core supplies.
For engineers reviewing the LTC3609IWKG#PBF datasheet, LTC3609IWKG#PBF pinout, LTC3609IWKG#PBF application, or LTC3609IWKG#PBF equivalent, key selection criteria include its 100ns minimum on-time, adjustable current limit via VRNG, power-good monitoring, soft-start programmability, and 7mm × 8mm 52-pin QFN package with thermal pad.
Technical Context
The LTC3609IWKG#PBF employs a constant on-time, valley current mode control architecture that enables stable regulation at high step-down ratios and extremely fast transient response. Its switching frequency is set by external resistor RON connected to ION and modulated by VON voltage, enabling near-constant frequency across input and output variations.
Fault protection includes foldback current limiting, output overvoltage detection (±10% window), undervoltage lockout (3.4V–4.0V), and optional short-circuit shutdown timer. Power sequencing is supported via RUN/SS with internal 1.2µA soft-start current source and external capacitor timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 32V (36V absolute maximum); 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). |
| Feedback Reference | ±1% 0.6V over –40°C to 125°C; enables precise output voltage setting with standard resistor dividers. |
| Min On-Time | ≤100ns; allows high step-down ratios (e.g., 24V→1.2V at 500kHz) without pulse-skipping instability. |
| Shutdown IQ | 15µA; minimizes system standby power in battery-backed or always-on applications. |
| PGOOD Threshold | ±10% output regulation window with hysteresis; provides reliable power-rail monitoring for FPGA/CPU reset sequencing. |
| Operating Temp | –40°C to +125°C junction; qualified for extended industrial and automotive under-hood environments. |
Pinout & Package
Package: 52-pin (7mm × 8mm) WKG QFN with exposed thermal pad (θJA = 29°C/W, θJC = 1°C/W). Pin-compatible with LTC3609E/LTC3609WKG variants; lead-free, RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (1,2,3,4,5,6,7,48–53) | Main input power supply connection | Distributed high-current input path; requires local ceramic decoupling to PGND for EMI suppression. |
| SW (8,33,41–47,55) | Switch node | High dv/dt node connecting to inductor; ties bootstrap capacitor (–) terminal and must be routed with minimal loop area. |
| PGND (34–40) | Power ground return | Low-impedance return for high di/dt currents; connects directly to CIN(–) and CVCC(–) to minimize ground bounce. |
| ITH (18) | Error amplifier output / current threshold control | Analog interface for compensation network; sets valley current limit and enables feed-forward stability tuning. |
| VRNG (17) | Current limit range select | Voltage-adjustable (0.7V–1.2V) input that scales maximum valley current from ~9A to ~14A for design margining. |
| PGOOD (16) | Open-drain power-good indicator | Signals regulation status to host controller; requires external pull-up for logic-level compatibility (e.g., 3.3V/5V). |
| RUN/SS (12) | Enable and soft-start control | Active-high enable with internal 1.2µA current source; external capacitor sets ramp time (~3s/µF) and latchoff delay. |
Key Features
| Feature | Design Value |
|---|---|
| Valley current mode control | Enables stable operation at ultra-low duty cycles (<5%) and eliminates subharmonic oscillation without slope compensation. |
| Programmable switching frequency | Set via RON from ION pin; supports 300kHz–1MHz range while maintaining constant frequency across VIN/VOUT changes. |
| Discontinuous/forced continuous mode selection | FCB pin selects light-load behavior: discontinuous for peak efficiency, forced continuous for low EMI and predictable ripple. |
| True current limit foldback | Reduces valley current to ~1/6 of max during short-circuit, limiting power dissipation and thermal stress during fault conditions. |
| Integrated INTVCC regulator + EXTVCC switchover | Internal 5V LDO powers control circuitry; automatic switchover to external 4.7V–7V supply improves efficiency and reduces self-heating. |
Applications
| FPGA Core Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Providing tightly regulated 1.2V/1.8V core voltage to Xilinx Artix-7 FPGA with dynamic load steps up to 5A/µs. IC Role / Device Role / Timing Role: Primary point-of-load regulator with fast transient response and PGOOD sequencing for configuration safety. Use Value: 100ns min on-time ensures stable 24V→1.2V conversion at 500kHz; ±1% reference maintains FPGA VCCINT spec compliance. |
Use Scenario: Generating isolated 5V/3.3V rails for analog sensor front-ends and digital logic in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-reliability buck converter with wide input range (12–36V DC) and robust fault protection. Use Value: Foldback current limiting and overvoltage shutdown prevent cascading failures during field wiring faults or sensor shorts. |
| Automotive ADAS Camera Module | Telecom Remote Radio Unit (RRU) |
|
Use Scenario: Powering image signal processor (ISP) and MIPI interface in rear-view camera with ambient temp –40°C to +105°C. IC Role / Device Role / Timing Role: Automotive-grade DC/DC converter with AEC-Q200-aligned thermal performance and startup reliability. Use Value: –40°C to +125°C operating range and 15µA shutdown IQ meet cold-cranking and low-power sleep requirements. |
Use Scenario: Converting 48V backplane to 12V intermediate bus for RF power amplifiers in outdoor macro-cell base stations. IC Role / Device Role / Timing Role: High-efficiency, high-current intermediate regulator with thermal management via exposed QFN pad. Use Value: 7mm × 8mm QFN package with θJC = 1°C/W enables direct heatsink attachment for 40W+ power delivery in compact enclosures. |
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 |
|---|---|---|---|
| MP2451DT-LF-Z | 36V input, 0.6A output, fixed 500kHz frequency, no programmable current limit or VRNG pin. | Suitable only for low-current auxiliary rails; lacks valley current mode, PGOOD, and thermal robustness for 6A loads. | Select LTC3609IWKG#PBF when >2A output, programmable protection, or high-temp operation is required. |
| TPS546D24RQFPR | 18V input, 60A multi-phase capable, PMBus interface, 3.3mm × 4.5mm QFN, higher cost and complexity. | Targeted at server CPU/GPU VRMs; over-engineered for single-rail 6A point-of-load use cases. | Choose LTC3609IWKG#PBF for simpler, lower-cost, standalone 6A buck with superior high-VIN capability (32V vs 18V). |
Compared with MP2451DT-LF-Z and TPS546D24RQFPR, the LTC3609IWKG#PBF uniquely balances 32V input tolerance, 6A monolithic integration, valley current mode stability, and industrial temperature rating in a thermally optimized 7mm × 8mm package-making it optimal for mid-power embedded systems where reliability and design simplicity are prioritized over digital control or ultra-miniaturization.
Availability
LTC3609IWKG#PBF is available at Aetrix Electronics and suitable for FPGA power delivery, industrial PLCs, automotive ADAS modules, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3609IWKG#PBF 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, datasheet documentation, and application engineering resources for the LTC portfolio.
The LTC3609IWKG#PBF belongs to Linear's high-voltage monolithic buck converter family, designed specifically for demanding point-of-load regulation in industrial, automotive, and communications infrastructure where wide input range, high current, and thermal resilience are critical.
FAQ
What is the maximum input voltage rating for the LTC3609IWKG#PBF?
The LTC3609IWKG#PBF has an absolute maximum input voltage of 36V across PVIN, SVIN, and ION pins. Its recommended operating input range is 4V to 32V. Exceeding 36V may cause permanent damage per Absolute Maximum Ratings. The device includes undervoltage lockout (3.4V–4.0V) and overvoltage protection on the PGOOD output to safeguard downstream circuitry.
How does the VRNG pin affect current limiting in the LTC3609IWKG#PBF?
The VRNG pin on the LTC3609IWKG#PBF adjusts the maximum valley current limit from ~9A (at 0.7V) to ~14A (at 1.2V) via an external resistive divider from INTVCC. This directly scales the peak inductor current and thus the maximum sustainable output current. The pin must not be left floating and should be tied to ground or a defined voltage to ensure repeatable current-limit behavior.
Can the LTC3609IWKG#PBF operate in discontinuous conduction mode (DCM)?
Yes, the LTC3609IWKG#PBF supports both discontinuous and forced continuous conduction modes. DCM is enabled by pulling the FCB pin above 0.6V (e.g., to INTVCC), which improves light-load efficiency by reducing switching losses. Forced continuous mode (FCB ≤ 0.54V) suppresses audible noise and EMI but increases quiescent current at very light loads.
What is the purpose of the ITH pin on the LTC3609IWKG#PBF?
The ITH pin on the LTC3609IWKG#PBF serves two critical functions: it is the error amplifier output that sets the valley current threshold, and it acts as the compensation node for the control loop. Connecting a Type-II or Type-III compensation network between ITH, VFB, and SGND stabilizes the regulator across line/load transients and ensures phase margin >45°.
Does the LTC3609IWKG#PBF require an external bootstrap diode?
Yes, the LTC3609IWKG#PBF requires an external Schottky diode (e.g., RB050M-30) connected from INTVCC to BOOST to recharge the bootstrap capacitor during each switching cycle. This diode must have low forward voltage (<0.4V) and fast recovery (<30ns) to maintain gate drive strength for the high-side MOSFET across the full operating temperature range.
LTC3609IWKG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-VFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3609IWKG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3609IWKG#PBF 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#PBF reliable?
The price and inventory of LTC3609IWKG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3609IWKG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3609IWKG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3609IWKG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3609IWKG#PBF?
LTC3609IWKG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3609IWKG#PBF 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#PBF?
For technical support, including LTC3609IWKG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3609IWKG#PBF requirements.
6.How does Aetrix verify that LTC3609IWKG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3609IWKG#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3609IWKG#PBF?
All LTC3609IWKG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3609IWKG#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3609IWKG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3609IWKG#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
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…
