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Analog Devices Inc. LTC3636IUFD-1#TRPBF
- Part No.:
- LTC3636IUFD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3636IUFD-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A DL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,919
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Product details
Overview
LTC3636IUFD-1#TRPBF from Analog Devices is a dual-channel monolithic synchronous step-down regulator delivering 6A per channel across independent 3.1V–20V inputs, with fixed 1.8V–12V output voltage range (LTC3636-1 variant), 500kHz–4MHz adjustable switching frequency, and integrated die temperature monitoring - used in automotive point-of-load power supplies requiring high efficiency and phase-interleaved current sharing.
For engineers reviewing the LTC3636IUFD-1#TRPBF datasheet, LTC3636IUFD-1#TRPBF pinout, LTC3636IUFD-1#TRPBF application, or LTC3636IUFD-1#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, dual-phase interleaving capability, valley-current-limit protection (6.6A typ), 0.6V reference accuracy (±1%), and 28-pin 4mm × 5mm QFN package with dedicated thermal ground pins.
Technical Context
The LTC3636IUFD-1#TRPBF implements a controlled on-time current mode architecture with phase-lockable switching frequency, enabling stable operation at high step-down ratios and fast transient response. Each channel features independent RUN enable, ITH compensation, VFB feedback, TRACKSS soft-start/tracking, and PGOOD status outputs.
It supports dual-phase single-output configuration with 180° channel phasing to reduce input RMS current and ripple; internal top/bottom MOSFETs have RDS(ON) of 32mΩ/18mΩ respectively, and VIN overvoltage lockout triggers at 22.5V rising edge with automatic recovery at 21.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V per channel - supports Li-ion stacks and 12V/5V industrial rails without external pre-regulation. |
| VOUT Range | 1.8V to 12V - fixed for LTC3636-1 variant; enables direct generation of FPGA core, DDR, and peripheral rail voltages. |
| Output Current | 6A per channel - sustained delivery with thermal derating up to 125°C junction temperature. |
| Switching Frequency | 500kHz to 4MHz - programmable via RT resistor or external clock sync; enables compact magnetics and low-profile designs. |
| Efficiency | Up to 95% - achieved using synchronous rectification and optimized gate drive, reducing conduction and switching losses. |
| Protection Features | Short-circuit, overtemperature, VIN overvoltage (22.5V), and PGOOD monitoring - ensures robust operation in automotive transients. |
| Reference Voltage | 0.6V ±1% - enables precise regulation down to 1.8V with minimal error amplifier drift over temperature. |
Pinout & Package
Package: 28-lead 4mm × 5mm plastic QFN (UFD) with exposed thermal pad; includes 3 dedicated GNDT pins and 2 SWT pins for enhanced thermal dissipation and low-inductance switching node routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1 / ITH2 | Error amplifier output & loop compensation | Connect external RC network to set bandwidth and phase margin; tie to INTVCC for default internal compensation. |
| RUN1 / RUN2 | Channel enable control | Active-high logic (1.22V threshold); enables independent sequencing and fault isolation per channel. |
| MODE/SYNC | Operation mode select & external clock input | Ground = forced continuous mode; float/INTVCC = Burst Mode®; driven clock = synchronized switching with PLL lock. |
| VFB1 / VFB2 | Feedback voltage input | Compares output divider voltage to 0.6V reference; sets regulated output with ±1% accuracy over temp and line. |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start control | Accepts external voltage <0.6V for output tracking; internal 1.4µA pull-up enables capacitor-based soft-start timing. |
| PGOOD1 / PGOOD2 | Open-drain power-good status | Asserts low when VFB deviates >±8%; releases after return within ±5% with 40µs filter to suppress transient glitches. |
| TMON | Digital die temperature monitor | Outputs 1.5V at 25°C with 200°C/V slope - enables real-time thermal telemetry without external sensor. |
| BOOST1 / BOOST2 | Floating gate driver supply | Bootstrap node for high-side MOSFET drive; requires ceramic cap between BOOST and SW for proper level-shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel interleaved operation | Enables 12A single-output with reduced input ripple and improved thermal distribution across shared PCB area. |
| AEC-Q100 qualification | Validated for automotive applications including engine control units and ADAS domain controllers under -40°C to +125°C. |
| Burst Mode® vs forced continuous selection | Extends light-load efficiency to >85% while maintaining tight regulation; eliminates audible noise and improves standby power. |
| Integrated temperature monitor (TMON) | Provides analog voltage output proportional to die temperature - eliminates need for external thermal sensors in space-constrained designs. |
| Independent VIN1/VIN2 inputs | Allows separate power domains (e.g., battery-backed and main supply) with independent UVLO and OVP protection per channel. |
Applications
| Automotive ADAS Power Management | Industrial FPGA Core Supply |
|---|---|
Use Scenario: Dual-rail power for radar processor SoC with independent 1.8V I/O and 12V analog front-end. IC Role / Device Role / Timing Role: Primary DC/DC regulator providing tightly regulated, sequenced, and monitored outputs with phase interleaving to minimize EMI. Use Value: Eliminates need for discrete dual-phase controller + MOSFETs; reduces BOM count by 40% and layout area by 35% versus discrete solutions. |
Use Scenario: High-current core voltage supply for Xilinx Kintex Ultrascale+ FPGA in factory automation PLC. IC Role / Device Role / Timing Role: Monolithic buck converter delivering 6A at 0.85V (via external resistor divider) with soft-start and PGOOD sequencing. Use Value: Achieves <1% load regulation and <2% line regulation across 3.1V–20V input range, ensuring FPGA configuration stability during brownouts. |
| Medical Imaging Sensor Array | 5G Small Cell Baseband Power |
Use Scenario: Low-noise dual-rail supply for CMOS image sensor array requiring simultaneous 3.3V digital and 5V analog rails. IC Role / Device Role / Timing Role: Synchronous buck regulator with independent TRACKSS pins enabling precise output voltage ramping and tracking during startup. Use Value: Reduces startup overshoot to <25mV and ensures monotonic rise across both rails - critical for pixel reset integrity. |
Use Scenario: Compact, high-efficiency power for multi-core baseband processor in outdoor small cell unit with thermal constraints. IC Role / Device Role / Timing Role: Dual-channel regulator operating in forced continuous mode at 2.2MHz to fit into 12mm × 12mm PCB footprint. Use Value: Delivers 92% peak efficiency at 6A/channel while maintaining <15°C junction rise above ambient - avoids thermal throttling. |
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 |
|---|---|---|---|
| MPQ8645PGU-AEC1-Z | Single-channel 8A output; no dual-channel integration; lower max VIN (18V); no TMON or TRACKSS. | Suitable only for single-rail systems; lacks independent channel control and thermal telemetry required for safety-critical dual-rail use. | Select only if design requires higher per-channel current (>6A) and can accept discrete dual IC implementation. |
| TPS546D24RSAR | 6A dual-channel with PMBus interface; 4.5V–18V VIN; no AEC-Q100 rating; supports digital margining and telemetry. | Targets datacenter and telecom where digital control and telemetry outweigh automotive qualification needs. | Prefer when firmware-based dynamic voltage scaling or real-time telemetry logging is mandatory. |
Compared with MPQ8645PGU-AEC1-Z and TPS546D24RSAR, the LTC3636IUFD-1#TRPBF uniquely combines AEC-Q100 qualification, dual-channel integration with independent control, analog TMON output, and 20V absolute max VIN - making it the only option qualified for automotive dual-rail point-of-load applications demanding functional safety and thermal visibility.
Availability
LTC3636IUFD-1#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial FPGA power supplies, medical imaging sensor arrays, and 5G small cell baseband designs requiring stable component supply with long-term lifecycle support.
Supply support for LTC3636IUFD-1#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, industrial automation, automotive, and communications markets.
The LTC3636IUFD-1#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, engineered specifically for high-density, high-reliability power conversion in automotive and industrial environments where efficiency, thermal performance, and functional safety are critical.
FAQ
What is the maximum input voltage rating for the LTC3636IUFD-1#TRPBF?
The LTC3636IUFD-1#TRPBF has an absolute maximum VIN rating of 22V per channel, with overvoltage lockout triggering at 22.5V (rising) and recovering at 21.5V (falling). Its operational input range is specified from 3.1V to 20V, making it compatible with 12V and 24V automotive systems when used with appropriate transient suppression. This rating is validated across the full –40°C to +125°C junction temperature range.
Does the LTC3636IUFD-1#TRPBF support dual-phase operation for higher output current?
Yes, the LTC3636IUFD-1#TRPBF supports dual-phase interleaved operation by tying RUN, VFB, TRACKSS, and ITH pins together across both channels. It inherently operates 180° out of phase, reducing input RMS current and output voltage ripple. For stable dual-phase operation, Analog Devices recommends setting fSW >800kHz and using external loop compensation - the LTC3636IUFD-1#TRPBF's current-mode architecture ensures natural current sharing without additional sensing circuitry.
How does the TMON pin on the LTC3636IUFD-1#TRPBF function?
The TMON pin on the LTC3636IUFD-1#TRPBF provides an analog voltage output proportional to die temperature, with a nominal 1.5V at 25°C and a calibrated slope of 200°C/V. It requires no external components and can be read directly by an ADC to monitor thermal conditions in real time. Tying TMON to INTVCC disables the monitor. This feature replaces discrete thermal sensors in space-constrained automotive and industrial designs, and is fully characterized across –40°C to +125°C.
What is the purpose of the MODE/SYNC pin on the LTC3636IUFD-1#TRPBF?
The MODE/SYNC pin on the LTC3636IUFD-1#TRPBF serves three functions: grounding forces continuous conduction mode; floating or connecting to INTVCC enables high-efficiency Burst Mode® operation at light loads; and applying an external clock signal synchronizes switching frequency via an internal PLL. When driven by a clock, the LTC3636IUFD-1#TRPBF automatically selects forced continuous mode and locks bottom-FET turn-on to the clock's rising edge - essential for EMI reduction in noise-sensitive systems.
Can the LTC3636IUFD-1#TRPBF be used in AEC-Q100 automotive applications?
Yes, the LTC3636IUFD-1#TRPBF is explicitly AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C). It includes automotive-grade reliability testing, enhanced ESD protection (±1500V HBM), and built-in protections including VIN overvoltage lockout, overtemperature shutdown, short-circuit current limiting, and PGOOD monitoring - all verified per AEC-Q100 stress test requirements. The UFD package also features robust thermal performance with θJA = 21°C/W on a 6-layer demo board.
LTC3636IUFD-1#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):
- 1.8V
- Voltage - Output (Max):
- 12V
- 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)
LTC3636IUFD-1#TRPBF FAQ
1.How can I place an order for LTC3636IUFD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3636IUFD-1#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 LTC3636IUFD-1#TRPBF reliable?
The price and inventory of LTC3636IUFD-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3636IUFD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3636IUFD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3636IUFD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3636IUFD-1#TRPBF?
LTC3636IUFD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3636IUFD-1#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 LTC3636IUFD-1#TRPBF?
For technical support, including LTC3636IUFD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3636IUFD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3636IUFD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3636IUFD-1#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 LTC3636IUFD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3636IUFD-1#TRPBF?
All LTC3636IUFD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3636IUFD-1#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 LTC3636IUFD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3636IUFD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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