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Analog Devices Inc. LTC3636EUFD-1#PBF
- Part No.:
- LTC3636EUFD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3636EUFD-1#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A DL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
LTC3636EUFD-1#PBF from Analog Devices is a dual-channel monolithic synchronous step-down regulator delivering 6A per channel across an input voltage range of 3.1V to 20V and output voltage range of 1.8V to 12V. It features current-mode control, adjustable switching frequency (500kHz–4MHz), and integrated power MOSFETs with 32mΩ top/18mΩ bottom RDS(ON). Used in high-density point-of-load supplies for telecom and industrial systems requiring tight regulation and fast transient response.
For engineers reviewing the LTC3636EUFD-1#PBF datasheet, LTC3636EUFD-1#PBF pinout, LTC3636EUFD-1#PBF application, or LTC3636EUFD-1#PBF equivalent, key selection criteria include its AEC-Q100 qualification, dual-phase interleaving capability, die temperature monitoring via TMON, and support for both Burst Mode® and forced continuous operation under varying load conditions.
Technical Context
The LTC3636EUFD-1#PBF implements a controlled on-time current-mode architecture with phase-lockable switching frequency, enabling stable operation at high step-down ratios and fast line/load transient response. Each channel operates 180° out of phase, sharing a common oscillator and supporting external synchronization via the MODE/SYNC pin.
It integrates dual 6A synchronous buck regulators with internal 0.6V reference, programmable valley current limit (6A typ), and comprehensive protection including VIN overvoltage lockout (22.5V), overtemperature shutdown, and short-circuit recovery with soft-start. The device supports output tracking, independent enable (RUN1/RUN2), and open-drain PGOOD status outputs per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V - supports single-cell Li-ion stacks and standard 12V/5V intermediate bus rails. |
| VOUT Range | 1.8V to 12V - fixed by LTC3636-1 variant; enables direct generation of FPGA core, I/O, and auxiliary rails. |
| Output Current | 6A per channel - sufficient for high-power ASICs, DSPs, and multi-core processors without external current sharing. |
| Switching Frequency | 500kHz to 4MHz - set by RT resistor or external clock; allows optimization of inductor size vs. efficiency. |
| Efficiency | Up to 95% - achieved using low RDS(ON) integrated MOSFETs (32mΩ/18mΩ) and adaptive mode selection. |
| Package | 28-lead 4mm × 5mm QFN - thermally enhanced with multiple GNDT and SWT pins for PCB heat spreading. |
| Protection Features | Input overvoltage lockout (22.5V), overtemperature shutdown, short-circuit recovery, and PGOOD filtering (40µs). |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN with exposed thermal pad (UFD), rated for –40°C to +125°C junction temperature and qualified to AEC-Q100 Grade 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1 / ITH2 | Error amplifier output & compensation node | Connects to RC network for loop stability; tie to INTVCC for internal compensation. |
| RUN1 / RUN2 | Channel enable inputs | Enable threshold: 1.22V (rising); shutdown below 1.01V; must not be left floating. |
| MODE/SYNC | Mode select & external sync input | Ground = forced continuous; float/INTVCC = Burst Mode®; driven clock = synchronized forced mode. |
| VFB1 / VFB2 | Feedback inputs | Compare output voltage to 0.6V internal reference; resistor divider sets VOUT (1.8V–12V for -1 variant). |
| PGOOD1 / PGOOD2 | Open-drain power-good outputs | Pulled low if VFB outside ±8%; releases at ±5%; includes 40µs glitch filter. |
| TMON | Digital die temperature monitor | 1.5V at 25°C, 200°C/V slope; connect to ADC for real-time thermal management. |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start inputs | Apply voltage <0.6V to track another rail; internal 1.4µA pull-up enables capacitor-based soft-start. |
| SW1 / SW2 | Switch node outputs | Drive external inductors; swing from ~–0.3V to VIN; requires low-inductance layout. |
| BOOST1 / BOOST2 | Floating gate drive supplies | Bootstrap capacitor connects between BOOST and SW; enables high-side NMOS drive above VIN. |
| VIN1 / VIN2 | Independent input supplies | Supports split-rail or redundant input configurations; VIN2 operates down to 1.5V when VIN1 >3.1V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel interleaved operation | 180° phase shift reduces RMS input current ripple and eases input capacitor selection. |
| Controlled on-time current-mode architecture | Enables stable high-frequency operation (up to 4MHz) with fast transient response and wide VIN/VOUT ratios. |
| Burst Mode® with 600µA sleep current | Maintains high light-load efficiency while minimizing standby power in battery-powered instruments. |
| Integrated die temperature monitor (TMON) | Provides calibrated analog voltage (200°C/V) for system-level thermal throttling without external sensors. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood applications with guaranteed operation from –40°C to +125°C. |
Applications
| Telecom Point-of-Load Supply | Automotive ADAS Power Management |
|---|---|
Use Scenario: Powering FPGA, SerDes, and DDR memory rails in 5G base station cards with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator providing isolated 3.3V and 1.8V outputs with interleaved switching to reduce input ripple. Use Value: Enables compact, high-efficiency DC/DC conversion with no external MOSFETs, reducing BOM count and layout area by >30% versus discrete solutions. |
Use Scenario: Supplying vision processor, radar SoC, and sensor interface ICs in camera modules and domain controllers. IC Role / Device Role / Timing Role: AEC-Q100-qualified dual regulator delivering 6A each at 1.2V and 3.3V with built-in overvoltage and overtemperature protection. Use Value: Eliminates need for external thermal monitoring and fault-handling logic, accelerating ASIL-B compliant design. |
| Industrial PLC I/O Module | Test & Measurement Equipment |
Use Scenario: Generating isolated analog front-end (2.5V) and digital logic (1.8V) rails in modular I/O cards with variable input voltage (12–24V). IC Role / Device Role / Timing Role: Dual buck controller supporting independent VIN1/VIN2 inputs and output voltage tracking for sequenced power-up. Use Value: Simplifies power sequencing across mixed-signal subsystems using TRACKSS pins, avoiding external supervisors. |
Use Scenario: Powering high-speed ADCs, DACs, and RF signal chains in portable spectrum analyzers requiring ultra-low noise and precise voltage accuracy. IC Role / Device Role / Timing Role: Low-noise, high-PSRR dual regulator with 0.6V reference tolerance (±1%) and load regulation ≤0.05%. Use Value: Maintains signal integrity in sensitive analog paths by minimizing output voltage drift under dynamic load steps. |
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 |
|---|---|---|---|
| MP8770HGQ-Z (Monolithic Power) | Fixed 2.2MHz fSW, 17V max VIN, 4A per channel, no TMON or AEC-Q100 rating. | Suitable for cost-sensitive consumer electronics; lacks automotive qualification and thermal monitoring. | Select when board space is constrained and 4A/channel suffices; avoid for automotive or thermally critical designs. |
| TPS546B24RVFR (Texas Instruments) | Single-channel, 6A, 16V max VIN, PMBus interface, no Burst Mode®, higher quiescent current (1.5mA). | Used where digital telemetry and margining are required; not drop-in for dual-output or low-IQ needs. | Choose only if PMBus configuration and telemetry outweigh need for dual outputs and 600µA sleep current. |
Compared with MP8770HGQ-Z and TPS546B24RVFR, the LTC3636EUFD-1#PBF uniquely combines dual 6A channels, AEC-Q100 qualification, die temperature monitoring, and sub-mA sleep current-making it optimal for space-constrained, thermally demanding, and automotive-grade applications where reliability and feature integration are critical.
Availability
LTC3636EUFD-1#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, automotive ADAS modules, and industrial PLC I/O requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3636EUFD-1#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The LTC3636EUFD-1#PBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, designed specifically for high-efficiency, high-density point-of-load power delivery in automotive, industrial, and communications systems.
FAQ
What is the maximum input voltage rating for the LTC3636EUFD-1#PBF?
The LTC3636EUFD-1#PBF has an absolute maximum VIN rating of 22V, with overvoltage lockout triggered at 22.5V (rising) and released at 21.5V (falling). This protects internal MOSFETs during transients. Operation is specified from 3.1V to 20V, making the LTC3636EUFD-1#PBF suitable for 12V and 24V intermediate bus systems with headroom for ripple and surges.
How does the LTC3636EUFD-1#PBF differ from the standard LTC3636 version?
The LTC3636EUFD-1#PBF is the -1 variant, featuring a 1.8V to 12V output voltage sense range, whereas the base LTC3636 supports 0.6V to 5V. This makes the LTC3636EUFD-1#PBF appropriate for higher-voltage rails like I/O supplies and auxiliary converters, while retaining identical pinout, protection features, and dual-channel architecture.
Can the two channels of the LTC3636EUFD-1#PBF be paralleled for higher current?
Yes - the LTC3636EUFD-1#PBF supports dual-phase parallel operation by tying RUN, VFB, TRACKSS, and ITH pins together and operating channels 180° out of phase. This configuration delivers up to 12A with reduced input/output ripple and balanced thermal distribution, provided external compensation is used and switching frequency exceeds 800kHz for stability.
What is the purpose of the TMON pin on the LTC3636EUFD-1#PBF?
The TMON pin on the LTC3636EUFD-1#PBF provides an analog voltage proportional to die temperature (1.5V at 25°C, 200°C/V slope), enabling real-time thermal monitoring without external sensors. It can be read by a system ADC to implement dynamic throttling or fault reporting. Tying TMON to INTVCC disables this function.
Does the LTC3636EUFD-1#PBF support output voltage tracking?
Yes - the LTC3636EUFD-1#PBF supports precise output voltage tracking via the TRACKSS1 and TRACKSS2 pins. Applying a ramped voltage (<0.6V) to these pins forces the corresponding VFB pin to follow it, enabling controlled power-up sequencing across multiple rails. An internal 1.4µA pull-up current also allows simple RC-based soft-start implementation.
LTC3636EUFD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC3636EUFD-1#PBF FAQ
1.How can I place an order for LTC3636EUFD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3636EUFD-1#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 LTC3636EUFD-1#PBF reliable?
The price and inventory of LTC3636EUFD-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3636EUFD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3636EUFD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3636EUFD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3636EUFD-1#PBF?
LTC3636EUFD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3636EUFD-1#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 LTC3636EUFD-1#PBF?
For technical support, including LTC3636EUFD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3636EUFD-1#PBF requirements.
6.How does Aetrix verify that LTC3636EUFD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3636EUFD-1#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 LTC3636EUFD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3636EUFD-1#PBF?
All LTC3636EUFD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3636EUFD-1#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 LTC3636EUFD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3636EUFD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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