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Analog Devices Inc. LTC3636EUFD#TRPBF
- Part No.:
- LTC3636EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3636EUFD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A DL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,734
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Product details
Overview
LTC3636EUFD#TRPBF from Analog Devices is a dual-channel monolithic synchronous step-down regulator delivering 6A per channel across 3.1V–20V input and 0.6V–5V output ranges, featuring current-mode control, adjustable 500kHz–4MHz switching frequency, and integrated die temperature monitoring - deployed in high-density point-of-load power supplies for FPGA and ASIC core rails.
For engineers reviewing the LTC3636EUFD#TRPBF datasheet, LTC3636EUFD#TRPBF pinout, LTC3636EUFD#TRPBF application, or LTC3636EUFD#TRPBF equivalent, key selection criteria include dual-phase interleaving capability, ±5% PGOOD accuracy with 40µs filtering, Burst Mode® vs forced continuous mode trade-offs, and AEC-Q100 qualification for automotive subsystems.
Technical Context
The LTC3636EUFD#TRPBF implements a controlled on-time current-mode architecture with phase-locked loop (PLL) synchronization, enabling stable operation at high step-down ratios and fast transient response. Each channel operates 180° out of phase, sharing one oscillator while maintaining independent feedback (VFB1/VFB2), enable (RUN1/RUN2), and compensation (ITH1/ITH2) paths.
It integrates dual high-side (32mΩ) and low-side (18mΩ) MOSFETs per channel, supports external frequency sync via MODE/SYNC pin, and provides valley-current limiting (6.6A typ), VIN overvoltage lockout (22.5V), and internal 0.6V reference with ±1% line/load regulation - all within a thermally enhanced 4mm × 5mm QFN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V - supports single-cell Li-ion stacks and industrial 12V/5V rails without pre-regulation. |
| VOUT Range | 0.6V to 5V - enables direct core voltage regulation for modern processors and FPGAs down to sub-1V logic domains. |
| Output Current | 6A per channel - sufficient for high-performance SoC core rails with margin for peak load transients. |
| Switching Frequency | 500kHz to 4MHz - programmable via RT resistor; allows optimization between small magnetics (high-f) and efficiency (low-f). |
| Efficiency | Up to 95% - achieved using synchronous rectification and low RDS(ON) MOSFETs, reducing conduction loss at full load. |
| Thermal Protection | Digital die temperature monitor (TMON) with 200°C/V slope - enables real-time thermal telemetry and system-level thermal management. |
| Power Good Accuracy | ±8% trip / ±5% release with 40µs filter - prevents false fault assertions during load transients while ensuring reliable rail sequencing. |
Pinout & Package
Package: 28-lead 4mm × 5mm plastic QFN (UFD), exposed thermal pad, RoHS-compliant, rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1 / ITH2 | Error amplifier output & compensation node | Connects to RC network for loop stability tuning; tie to INTVCC for internal compensation. |
| RUN1 / RUN2 | Channel enable inputs | Active-high (1.22V threshold); controls independent startup/shutdown sequencing per rail. |
| MODE/SYNC | Mode select & external clock input | Ground = forced continuous; float/INTVCC = Burst Mode®; driven clock = PLL-synced operation. |
| VFB1 / VFB2 | Feedback inputs | Compare output voltage against 0.6V reference; set VOUT via resistor divider (e.g., 3.3V = 10kΩ/15.4kΩ). |
| PGOOD1 / PGOOD2 | Open-drain power-good status outputs | Assert low when VFB deviates >±8%; release after returning within ±5% - used for rail sequencing and fault reporting. |
| TMON | Digital die temperature monitor output | 1.5V at 25°C, 200°C/V slope - read by ADC to implement thermal throttling or system shutdown. |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start control inputs | Apply voltage <0.6V to track another rail; connect capacitor to INTVCC for controlled soft-start ramp. |
| SW1 / SW2 | Switch node outputs | Drive external inductors; swing from ~–0.3V to VIN - requires low-inductance layout and proper bootstrap cap placement. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel interleaved operation | 180° phase shift reduces RMS input ripple by ~30%, enabling smaller input capacitors and lower EMI. |
| Burst Mode® vs forced continuous selection | 600µA light-load quiescent current in Burst Mode®; 1.3mA in forced continuous - extends battery life or minimizes standby loss. |
| Integrated MOSFETs with low RDS(ON) | Top switch 32mΩ / bottom switch 18mΩ - reduces conduction loss and eliminates external FET layout complexity. |
| Robust protection suite | Includes VIN overvoltage lockout (22.5V), overtemperature shutdown, short-circuit foldback, and PGOOD filtering - ensures safe operation under fault conditions. |
| AEC-Q100 qualified | Rated for automotive applications (Grade 1: –40°C to +125°C), supporting infotainment, ADAS, and body electronics. |
Applications
| FPGA Core Power | Automotive Infotainment SoC |
|---|---|
|
Use Scenario: Powering dual-core FPGA fabric and I/O banks requiring tightly regulated 1.2V and 3.3V rails with fast transient response. IC Role / Device Role / Timing Role: Dual-channel buck controller providing independent, sequenced, and tracked outputs with PGOOD signaling for configuration safety. Use Value: Eliminates need for discrete controllers and external MOSFETs; achieves <1% output deviation during 4A/µs load steps via current-mode control. |
Use Scenario: Supplying processor cores, GPU, and memory interfaces in head-unit systems operating across automotive temperature and input voltage ranges. IC Role / Device Role / Timing Role: AEC-Q100-qualified dual regulator managing 1.8V core and 5V I/O rails with thermal telemetry via TMON pin. Use Value: Enables real-time die temperature monitoring for dynamic thermal throttling, meeting ISO 26262 functional safety requirements. |
| Industrial PLC CPU Module | High-Density Telecom Board |
|
Use Scenario: Delivering 6A @ 1.0V and 6A @ 3.3V to ARM-based PLC CPUs in space-constrained DIN-rail mounted enclosures. IC Role / Device Role / Timing Role: Monolithic dual buck IC with integrated power stages and thermal sensing - replaces two discrete converters and saves >35% PCB area. Use Value: Reduces BOM count by 12 components per channel; supports 12V input with no external LDO needed due to wide VIN range. |
Use Scenario: Point-of-load conversion for multi-rail telecom baseband processors requiring low-noise, high-efficiency 1.2V/1.8V/3.3V supplies. IC Role / Device Role / Timing Role: Interleaved dual-phase regulator minimizing input ripple and EMI emissions in dense RF-sensitive environments. Use Value: Achieves <10mVpp output ripple at full load using 0.56µH inductors and ceramic caps - meets GR-1089 Class B conducted emission limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8770GQ-Z (Monolithic Power) | Single-channel 12A output; no integrated TMON or AEC-Q100 rating; fixed 500kHz–2.2MHz sync range. | Lacks dual independent channels and die temperature monitoring - unsuitable for rail tracking or automotive thermal management. | Select only if single-rail high-current delivery suffices and automotive qualification is not required. |
| TPS546D24RJNR (Texas Instruments) | Dual-channel 10A/10A; supports PMBus interface and digital telemetry; wider VOUT range (0.5V–5.5V); no Burst Mode®. | Requires external EEPROM and firmware for configuration; higher cost and design overhead than analog-programmed LTC3636EUFD#TRPBF. | Prefer for systems needing remote monitoring, dynamic voltage scaling, or strict digital compliance - not for cost-optimized analog designs. |
Compared with MP8770GQ-Z and TPS546D24RJNR, the LTC3636EUFD#TRPBF uniquely balances dual independent 6A channels, analog programmability, integrated thermal sensing, and AEC-Q100 qualification - making it optimal for space-constrained, thermally aware, and automotive-grade point-of-load designs where simplicity and reliability outweigh digital configurability.
Availability
LTC3636EUFD#TRPBF is available at Aetrix Electronics and suitable for FPGA power delivery, automotive infotainment systems, and industrial PLC CPU modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3636EUFD#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The LTC3636EUFD#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, designed specifically for high-efficiency, high-density point-of-load conversion in demanding embedded, automotive, and industrial applications.
FAQ
What is the maximum supported switching frequency for LTC3636EUFD#TRPBF?
The LTC3636EUFD#TRPBF supports an adjustable switching frequency from 500kHz to 4MHz, set by an external resistor on the RT pin. When RT is tied to INTVCC, the default frequency is approximately 2MHz. Operation up to 4MHz enables use of sub-microhenry inductors and compact ceramic capacitors, critical for high-density PCB layouts.
Does LTC3636EUFD#TRPBF support output voltage tracking between channels?
Yes, the LTC3636EUFD#TRPBF supports precise output voltage tracking via the TRACKSS1 and TRACKSS2 pins. Applying a voltage below 0.6V to either pin forces the corresponding channel's feedback loop to servo its VFB pin to that voltage, enabling synchronized startup and rail sequencing - essential for multi-voltage SoCs and FPGAs.
How does the Burst Mode® operation affect light-load efficiency in LTC3636EUFD#TRPBF?
In Burst Mode®, the LTC3636EUFD#TRPBF reduces quiescent current to 600µA per channel while maintaining regulation, significantly improving light-load efficiency compared to forced continuous mode (1.3mA). This mode disables switching during idle periods, minimizing gate drive and switching losses - ideal for battery-powered instruments and always-on subsystems.
Is LTC3636EUFD#TRPBF qualified for automotive applications?
Yes, the LTC3636EUFD#TRPBF is AEC-Q100 qualified (Grade 1: –40°C to +125°C), with built-in protections including VIN overvoltage lockout (22.5V), overtemperature shutdown, and robust ESD tolerance (±1500V HBM). Its integrated die temperature monitor (TMON) further supports automotive thermal management requirements.
What thermal performance can be expected from LTC3636EUFD#TRPBF in a typical 6-layer PCB layout?
In a standard 6-layer evaluation board (DC2335), the LTC3636EUFD#TRPBF exhibits θJA = 21°C/W and θJC = 7°C/W. With proper thermal pad soldering and copper pour, it sustains 6A per channel continuously at ambient temperatures up to 85°C - verified by thermal imaging and junction temperature monitoring via the TMON pin.
LTC3636EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 6A
- Frequency - Switching:
- Adjustable
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3636EUFD#TRPBF FAQ
1.How can I place an order for LTC3636EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3636EUFD#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 LTC3636EUFD#TRPBF reliable?
The price and inventory of LTC3636EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3636EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3636EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3636EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3636EUFD#TRPBF?
LTC3636EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3636EUFD#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 LTC3636EUFD#TRPBF?
For technical support, including LTC3636EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3636EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3636EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3636EUFD#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 LTC3636EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3636EUFD#TRPBF?
All LTC3636EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3636EUFD#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 LTC3636EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3636EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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