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Analog Devices Inc. LTC3636IUFD#TRPBF
- Part No.:
- LTC3636IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3636IUFD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A DL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,393
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Product details
Overview
LTC3636IUFD#TRPBF 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 range of 0.6V to 5V. 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 FPGA, ASIC, and DSP core rails.
For engineers reviewing the LTC3636IUFD#TRPBF datasheet, LTC3636IUFD#TRPBF pinout, LTC3636IUFD#TRPBF application, or LTC3636IUFD#TRPBF equivalent, key selection factors include dual-phase interleaving capability, die temperature monitoring via TMON pin, Burst Mode® vs forced continuous mode selection, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3636IUFD#TRPBF implements a controlled on-time current-mode architecture with phase-locked loop synchronization, enabling stable operation at high step-down ratios and fast transient response. Each channel operates 180° out of phase, sharing one oscillator and supporting external RT resistor programming or MODE/SYNC clock synchronization.
It integrates dual 6A synchronous buck stages with internal 0.6V reference, valley-current limiting (6A typ), overvoltage lockout (22.5V VIN), and thermal shutdown. The device supports output tracking, soft-start, and independent enable (RUN1/RUN2) with precise 1.22V threshold and 100µA leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V - supports single-cell Li-ion up to 12V/20V industrial rails without external pre-regulation. |
| VOUT Range | 0.6V to 5V - enables direct core supply for modern processors and low-voltage logic (e.g., 1.2V, 1.8V, 3.3V). |
| Output Current | 6A per channel - sufficient for high-power digital loads; dual-phase parallel configuration supports >12A total. |
| Switching Frequency | 500kHz to 4MHz - programmable via RT pin; higher frequencies allow compact 0.56µH inductors and ceramic output caps. |
| Efficiency | Up to 95% - achieved at mid-load in forced continuous mode; Burst Mode® extends light-load efficiency down to µA quiescent. |
| Package | 28-lead 4mm × 5mm QFN - thermally enhanced with multiple GNDT/SWT pins; θJA = 21°C/W on 6-layer demo board. |
| Protections | Short-circuit, overtemperature, VIN overvoltage (22.5V), PGOOD status - ensures robust operation in unregulated environments. |
Pinout & Package
28-lead 4mm × 5mm plastic QFN (UFD package) with exposed thermal pad; pin-compatible with LTC3636-1 variants but differing VOUT sense range.
| 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 | Active-high (1.22V threshold); independent control enables staggered startup or fault isolation. |
| MODE/SYNC | Mode select & external clock input | Ground = forced continuous; float/INTVCC = Burst Mode®; driven clock = synchronized switching (PLL-locked). |
| VFB1 / VFB2 | Feedback inputs | Compare output voltage to 0.6V reference; resistor divider sets VOUT precisely (±1% typical load regulation). |
| PGOOD1 / PGOOD2 | Open-drain power-good outputs | Assert low when VFB deviates >±8%; release after return within ±5% - provides sequencing and system health monitoring. |
| TMON | Digital die temperature monitor | 1.5V at 25°C, 200°C/V slope - enables real-time thermal telemetry without external sensor. |
| SW1 / SW2 | Switch node outputs | Drive external inductors; voltage swing from ~–0.3V to VIN - requires low-inductance layout and bootstrap capacitor routing. |
| BOOST1 / BOOST2 | Floating gate drive supplies | Bootstrap nodes for high-side MOSFET drivers; require ceramic cap (10nF–100nF) between BOOST and SW. |
| TRACKSS1 / TRACKSS2 | Tracking & soft-start inputs | Accept external ramp for voltage sequencing; internal 1.4µA pull-up enables RC soft-start (1–2ms typical). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel interleaved operation | 180° phase shift reduces RMS input ripple by ~30%, allowing smaller input capacitors and lower EMI. |
| Controlled on-time current-mode architecture | Enables stable high-frequency operation (up to 4MHz) with fast line/load transient response (<10µs recovery). |
| Burst Mode® with <600µA sleep current | Extends battery life in portable instruments by disabling switching and entering ultra-low-power state at light loads. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C junction operation - suitable for under-hood automotive ECUs and ADAS power rails. |
| Integrated power MOSFETs (32mΩ/18mΩ) | Eliminates external high-side/low-side FETs and drivers - reduces BOM count, layout area, and thermal complexity. |
Applications
| Telecom Baseband Processing | Automotive ADAS Domain Controller |
|---|---|
|
Use Scenario: Powering multi-core SoC and DDR memory subsystems in 5G remote radio units with tight thermal constraints. IC Role / Device Role / Timing Role: Dual-channel point-of-load regulator delivering 3.3V @ 6A (I/O) and 1.2V @ 6A (core) from 12V backplane. Use Value: Interleaved switching cuts input ripple current by 40%, reducing required bulk capacitance and improving EMC compliance. |
Use Scenario: Supplying vision processor, radar SoC, and CAN transceivers in centralized vehicle compute modules. IC Role / Device Role / Timing Role: Primary 5V/3.3V/1.8V power source with AEC-Q100 qualification and VIN OV protection for 24V battery transients. Use Value: Die temperature monitoring (TMON) enables dynamic thermal throttling of adjacent processors without external sensors. |
| Industrial PLC CPU Module | Test & Measurement Instrumentation |
|
Use Scenario: Providing isolated, sequenced rails for ARM-based controller, FPGA configuration, and analog front-end in modular I/O systems. IC Role / Device Role / Timing Role: Dual-buck regulator with TRACKSS-enabled voltage ramping for safe FPGA core-to-I/O power-up sequencing. Use Value: Independent RUN1/RUN2 control allows firmware-driven power domain isolation during diagnostics or firmware updates. |
Use Scenario: Battery-powered handheld oscilloscopes and spectrum analyzers requiring long runtime and low-noise analog supplies. IC Role / Device Role / Timing Role: High-efficiency dual rail generator (1.8V @ 6A for ADC/DAC, 3.3V @ 6A for microcontroller) from 2S Li-ion (6–8.4V). Use Value: Burst Mode® operation draws only 600µA at standby - extends battery life beyond 72 hours in sleep mode. |
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-A-Z | Single-chip dual 6A buck; fixed 500kHz–3MHz sync range; no die temp monitor or TRACKSS. | Lacks TMON and tracking - unsuitable for thermal-aware systems or strict power sequencing. | Prefer for cost-sensitive, non-automotive designs where thermal telemetry and soft-start control are not required. |
| TPS546B24RVFT | Single 12A buck with PMBus interface; supports AVS, margining, and telemetry; larger 5mm × 6mm QFN. | Not dual-channel; requires external sequencing IC for multi-rail coordination; no Burst Mode®. | Choose when digital power management (PMBus), voltage margining, or AVS are needed over dual independent channels. |
Compared with MPQ8645PGU-A-Z and TPS546B24RVFT, the LTC3636IUFD#TRPBF uniquely combines dual independent 6A channels, integrated die temperature sensing, analog tracking/soft-start, and AEC-Q100 qualification - making it optimal for space-constrained, thermally managed, and automotive-grade multi-rail systems.
Availability
LTC3636IUFD#TRPBF is available at Aetrix Electronics and suitable for telecom baseband processing, automotive ADAS domain controllers, and industrial PLC CPU modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3636IUFD#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 LTC3636IUFD#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, engineered for high-efficiency, high-density point-of-load conversion in demanding industrial, automotive, and communications infrastructure applications.
FAQ
What is the maximum supported switching frequency for the LTC3636IUFD#TRPBF?
The LTC3636IUFD#TRPBF supports a programmable switching frequency from 500kHz to 4MHz using an external RT resistor. When RT is tied to INTVCC, the default frequency is approximately 2MHz. Operation up to 4MHz enables use of sub-1µH inductors and compact ceramic output capacitors, critical for space-constrained PCB layouts. The device maintains stable current-mode control across this full range.
Does the LTC3636IUFD#TRPBF support parallel operation for higher current output?
Yes, the LTC3636IUFD#TRPBF supports dual-phase parallel operation by connecting RUN1/RUN2, VFB1/VFB2, TRACKSS1/TRACKSS2, and ITH1/ITH2 together while operating channels 180° out of phase. This configuration delivers >12A total output with reduced input/output ripple and improved thermal distribution. External compensation is required when paralleling; internal compensation must be disabled.
How does the TMON pin function on the LTC3636IUFD#TRPBF?
The TMON pin on the LTC3636IUFD#TRPBF provides a voltage proportional to on-die temperature (1.5V at 25°C, 200°C/V slope). It enables real-time thermal monitoring without external sensors. Tying TMON to INTVCC disables the monitor. The output is calibrated and specified across –40°C to +125°C, supporting closed-loop thermal management in automotive and industrial applications where junction temperature must remain within safe limits.
What protection features are integrated into the LTC3636IUFD#TRPBF?
The LTC3636IUFD#TRPBF integrates short-circuit protection via valley-current limiting, VIN overvoltage lockout (22.5V trip), overtemperature shutdown, and open-drain PGOOD outputs with ±8% fault detection and ±5% release thresholds. It also includes undervoltage lockout on INTVCC (2.9V rising) and RUN pins (1.22V rising), ensuring reliable startup and fault containment in noisy or unstable supply environments.
Can the LTC3636IUFD#TRPBF operate from a single input supply for both channels?
Yes, the LTC3636IUFD#TRPBF can operate both channels from a single input supply by connecting VIN1 and VIN2 together. Its wide 3.1V–20V input range accommodates common sources like 12V industrial rails or 2S/3S Li-ion batteries. However, VIN2 supports down to 1.5V when VIN1 is active, enabling asymmetric input configurations - e.g., channel 1 powered from 12V, channel 2 from a local 3.3V LDO - for flexible power architecture design.
LTC3636IUFD#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)
LTC3636IUFD#TRPBF FAQ
1.How can I place an order for LTC3636IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3636IUFD#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#TRPBF reliable?
The price and inventory of LTC3636IUFD#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3636IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3636IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3636IUFD#TRPBF?
LTC3636IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3636IUFD#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#TRPBF?
For technical support, including LTC3636IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3636IUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3636IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3636IUFD#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3636IUFD#TRPBF?
All LTC3636IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3636IUFD#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3636IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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