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Analog Devices Inc. LTC3636EUFD#PBF
- Part No.:
- LTC3636EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3636EUFD#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A DL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,073
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Product details
Overview
LTC3636EUFD#PBF from Analog Devices is a dual-channel monolithic synchronous step-down regulator delivering 6A per channel across a 3.1V–20V input range and 0.6V–5V output range, featuring current-mode control, adjustable 500kHz–4MHz switching frequency, and integrated die temperature monitoring for high-density point-of-load power conversion in industrial and automotive systems.
For engineers reviewing the LTC3636EUFD#PBF datasheet, LTC3636EUFD#PBF pinout, LTC3636EUFD#PBF application, or LTC3636EUFD#PBF equivalent, key selection considerations include its dual-phase interleaved capability, Burst Mode® vs forced continuous operation trade-offs, VIN overvoltage lockout (22.5V), and QFN-28 (4mm × 5mm) thermal performance with θJC = 7°C/W.
Technical Context
The LTC3636EUFD#PBF implements a controlled on-time current-mode architecture with phase-lockable switching frequency, enabling stable high-frequency operation (up to 4MHz) while maintaining fast transient response under wide input/output ratios. Each channel operates 180° out of phase to reduce input RMS current and ripple.
It integrates dual high-side/low-side MOSFETs (RDS(ON) = 32mΩ / 18mΩ), internal 0.6V reference with ±1% accuracy over temperature, and independent RUN/PGOOD/TRACKSS pins per channel for sequencing, power-good signaling, and output voltage tracking-supporting pre-biased start-up and soft-start via external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V - supports single-cell Li-ion stacks and 5V/12V intermediate bus architectures without external LDO pre-regulation. |
| VOUT Range | 0.6V to 5V - enables core logic, FPGA I/O, and DDR memory rails with 0.6V reference and ±0.6% load regulation. |
| Output Current | 6A per channel - sustained delivery with valley current limit of 6.6A (typ) and thermal shutdown at 125°C junction. |
| Switching Frequency | 500kHz to 4MHz - programmable via RT resistor; 2MHz default when RT tied to INTVCC; supports small 0.56µH inductors. |
| Efficiency | Up to 95% - achieved in forced continuous mode at full load; Burst Mode® extends light-load efficiency down to 600µA quiescent current. |
| Package | 28-Lead QFN (4mm × 5mm) - exposed pad for low θJC = 7°C/W; AEC-Q100 qualified for automotive underhood applications. |
| Protections | Input overvoltage lockout (22.5V), overtemperature shutdown, short-circuit current limiting, and PGOOD status with 40µs glitch filter. |
Pinout & Package
28-Lead (4mm × 5mm) Plastic QFN package with exposed thermal pad (UFD). Pin 1 marked by dot; pins 12/18/19/25 are GND; pins 30/31/32 are GNDT (thermal ground); pins 33/34 are SWT1T/SWT2T (optional switch node extensions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1 / ITH2 | Error amplifier output & compensation node | Connect external RC network for loop stability; tie to INTVCC for internal compensation - sets valley current threshold. |
| RUN1 / RUN2 | Channel enable input | Enable above 1.22V (typ); shutdown below 1.01V (typ); hysteresis prevents chatter during power ramp. |
| MODE/SYNC | Mode select & sync input | Ground = forced continuous; float/INTVCC = Burst Mode®; driven clock = synchronized forced continuous (PLL-locked). |
| VFB1 / VFB2 | Feedback input | Compares output divider voltage to 0.6V reference; ±0.6% load regulation ensures tight output tolerance. |
| PGOOD1 / PGOOD2 | Open-drain power-good output | Pulled low if VFB outside ±8%; releases at ±5%; 25Ω pull-down supports direct MCU GPIO interface. |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start input | 0.3V threshold for tracking; 1.4µA internal pull-up enables capacitor-based soft-start (1–1.5ms typical rise time). |
| TMON | Digital die temperature monitor | 1.5V at 25°C, 200°C/V slope - enables system-level thermal management without external sensor. |
| BOOST1 / BOOST2 | Floating gate driver supply | Connected between SW and BOOST pins via bootstrap capacitor; sustains high-side MOSFET drive up to VIN + INTVCC. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel interleaved operation | 180° phase shift reduces input ripple by ~70%, allowing smaller bulk capacitors and lower EMI in multi-rail systems. |
| Controlled on-time current mode | Enables stable 0.6V outputs at high step-down ratios (e.g., 12V→0.6V) without subharmonic oscillation or external slope compensation. |
| Burst Mode® with 600µA IQ | Extends battery life in standby: maintains regulation while drawing only 600µA from VIN, versus 1.3mA in forced continuous mode. |
| Integrated temperature monitor (TMON) | Provides real-time die temperature feedback (1.5V @ 25°C, 200°C/V) - eliminates need for discrete thermal sensors in space-constrained designs. |
| AEC-Q100 qualification | Rated for automotive temperature range (–40°C to +125°C junction), including HTOL, TC, and ESD testing per JESD47. |
Applications
| Industrial PLC Power Rails | Automotive ADAS Camera Modules |
|---|---|
|
Use Scenario: Powering dual-core ARM processors and image signal processors (ISPs) in compact camera ECUs requiring isolated 1.2V, 1.8V, and 3.3V rails from a 12V vehicle battery. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing tightly regulated, sequenced, and tracked outputs with PGOOD confirmation for safe processor boot. Use Value: Interleaved operation minimizes input capacitance and conducted EMI; TMON enables dynamic thermal throttling before junction exceeds 125°C. |
Use Scenario: Distributed power in surround-view camera systems where multiple cameras share a common 12V supply but require independent 1.1V core and 2.8V I/O rails. IC Role / Device Role / Timing Role: Dual-output PMIC managing independent enable, tracking, and fault reporting per camera channel with minimal PCB area. Use Value: Independent RUN/PGOOD/TRACKSS pins allow per-camera power sequencing and failure isolation; AEC-Q100 rating ensures reliability in under-hood environments. |
| High-Density FPGA Mezzanine Cards | Test & Measurement Instrumentation |
|
Use Scenario: Powering Xilinx Artix-7 FPGA banks (HR, HP) and transceivers on PCIe add-in cards with strict voltage sequencing and <1% ripple requirements. IC Role / Device Role / Timing Role: Dual-channel regulator implementing precise voltage tracking (via TRACKSS) and soft-start to meet FPGA VCCINT/VCCAUX ramp timing specs. Use Value: Internal 0.6V reference and ±0.6% load regulation ensure compliance with FPGA voltage tolerances; 4MHz max fSW supports ultra-small 0.33µH inductors. |
Use Scenario: Portable handheld analyzers requiring long battery life and clean analog supply rails (±1.8V, 3.3V) for ADCs, DACs, and RF front-ends. IC Role / Device Role / Timing Role: High-efficiency dual buck supplying precision analog and digital domains with independent Burst Mode® optimization per rail. Use Value: 600µA sleep current extends runtime in standby; low-noise forced continuous mode available for sensitive analog sections during active measurement. |
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 |
|---|---|---|---|
| MPQ4436-AEC1 | 4A per channel, fixed 500kHz/2.2MHz options, no TMON or TRACKSS, smaller 3mm × 4mm QFN-22 | Lower current capacity; lacks die temperature monitoring and output tracking - unsuitable for FPGA sequencing or thermal-aware systems. | Select when board space is critical and 4A/channel suffices; verify thermal margin with θJA = 35°C/W (vs LTC3636's 21°C/W). |
| TPS546B24A | Single-channel 15A, PMBus interface, 0.6V reference, but no integrated TMON or dual-phase interleaving | Requires two devices for dual-rail support; adds PMBus overhead and layout complexity; no native channel-to-channel tracking. | Choose for digitally programmable voltage/current margins and telemetry; avoid when analog simplicity, size, or thermal monitoring are priorities. |
Compared with MPQ4436-AEC1 and TPS546B24A, the LTC3636EUFD#PBF uniquely combines dual 6A channels, die temperature sensing, output tracking, and AEC-Q100 qualification in a thermally optimized 4mm × 5mm package - making it optimal for space-constrained, thermally demanding, and safety-critical dual-rail applications.
Availability
LTC3636EUFD#PBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS modules, FPGA mezzanine cards, and portable test equipment requiring stable component supply, automotive-grade reliability, and high-density power integration.
Supply support for LTC3636EUFD#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, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The LTC3636EUFD#PBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, designed specifically for high-efficiency, high-current, and thermally constrained point-of-load applications in automotive, industrial, and computing systems.
FAQ
What is the maximum supported switching frequency for the LTC3636EUFD#PBF?
The LTC3636EUFD#PBF supports an adjustable switching frequency from 500kHz to 4MHz, set by an external resistor on the RT pin. At RT = 80.6kΩ, the typical frequency is 4MHz. When RT is tied to INTVCC, the internal oscillator defaults to 2MHz ±30% due to process and temperature variation - suitable for non-critical timing applications.
Does the LTC3636EUFD#PBF support output voltage tracking between channels?
Yes, the LTC3636EUFD#PBF supports independent output voltage tracking via dedicated TRACKSS1 and TRACKSS2 pins. Applying a ramped voltage (e.g., via RC network) to TRACKSS1 forces Channel 1's VOUT1 to follow that ramp relative to its feedback divider, enabling controlled power-up sequencing with Channel 2 - critical for FPGA and multi-rail SoC applications.
How does the die temperature monitor (TMON) function in the LTC3636EUFD#PBF?
The TMON pin on the LTC3636EUFD#PBF outputs a voltage proportional to on-die temperature (1.5V at 25°C, 200°C/V slope). It requires no external components; tying TMON to INTVCC disables the monitor. This analog output enables real-time thermal profiling and closed-loop fan control or dynamic frequency scaling without adding discrete sensors.
Can the LTC3636EUFD#PBF operate with pre-biased outputs during start-up?
Yes, the LTC3636EUFD#PBF supports start-up into pre-biased outputs in both Burst Mode® and forced continuous modes, as confirmed in Figures 23–24 of the datasheet. The current-mode architecture and valley-current limiting prevent reverse current flow, ensuring safe and glitch-free initialization when downstream capacitors are already charged.
What protection features are integrated into the LTC3636EUFD#PBF?
The LTC3636EUFD#PBF integrates VIN overvoltage lockout (22.5V trip), overtemperature shutdown (125°C), short-circuit current limiting (6.6A valley limit), and open-drain PGOOD outputs with 40µs filtering. It also features undervoltage lockout on INTVCC (2.9V rising) and RUN pin hysteresis to prevent erratic enable/disable behavior during power ramps.
LTC3636EUFD#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):
- 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#PBF FAQ
1.How can I place an order for LTC3636EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3636EUFD#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#PBF reliable?
The price and inventory of LTC3636EUFD#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3636EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3636EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3636EUFD#PBF?
LTC3636EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3636EUFD#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#PBF?
For technical support, including LTC3636EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3636EUFD#PBF requirements.
6.How does Aetrix verify that LTC3636EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3636EUFD#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3636EUFD#PBF?
All LTC3636EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3636EUFD#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#PBF part is unused and in its original packaging.
Return procedure for LTC3636EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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