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Analog Devices Inc. LTC3636IUFD#PBF
- Part No.:
- LTC3636IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3636IUFD#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A DL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,140
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Product details
Overview
LTC3636IUFD#PBF from Analog Devices is a dual-channel monolithic synchronous step-down regulator delivering 6A per channel across a 3.1V–20V input range, with independent 0.6V–5V output voltage programming per channel and integrated current-mode control for fast transient response in point-of-load power supplies.
For engineers reviewing the LTC3636IUFD#PBF datasheet, LTC3636IUFD#PBF pinout, LTC3636IUFD#PBF application, or LTC3636IUFD#PBF equivalent, key selection criteria include its 28-lead 4mm × 5mm QFN package, programmable 500kHz–4MHz switching frequency, Burst Mode®/forced continuous mode selection, die temperature monitoring (TMON), and dual-phase interleaving capability for >6A single-rail operation.
Technical Context
The LTC3636IUFD#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 line/load transient response. Each channel features independent RUN enable, feedback (VFB), compensation (ITH), and tracking/soft-start (TRACKSS) pins.
It integrates dual N-channel MOSFET drivers with 32mΩ top-side and 18mΩ bottom-side RDS(ON), supports external synchronization via MODE/SYNC pin, and provides independent PGOOD status outputs with ±8% fault detection and 40µs filtering. VIN overvoltage lockout triggers at 22.5V rising edge and recovers at 21.5V falling edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V - supports Li-ion battery stacks and 5V/12V intermediate bus systems |
| VOUT Range | 0.6V to 5V - enables low-voltage core rails including 1.8V, 3.3V, and 5V logic supplies |
| Output Current | 6A per channel - sufficient for FPGA I/O banks, ASIC cores, and high-performance SoCs |
| Switching Frequency | 500kHz to 4MHz - allows optimization between small magnetics (high-f) and peak efficiency (low-f) |
| Efficiency | Up to 95% - achieved at mid-to-heavy load with optimized layout and external components |
| Reference Voltage | 0.6V ±1% - enables precise regulation of sub-1V outputs with minimal divider error impact |
| Thermal Protection | Overtemperature shutdown with TMON analog output (200°C/V scaling) - enables real-time die temperature monitoring |
Pinout & Package
Package: 28-lead 4mm × 5mm plastic QFN (UFD), exposed thermal pad, rated for –40°C to 125°C junction temperature, θJA = 21°C/W on 6-layer demo board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH1 / ITH2 | Error amplifier output & loop compensation | Connect external RC network for stability tuning; tie to INTVCC for internal compensation |
| RUN1 / RUN2 | Channel enable input | Logic-high (>1.22V) enables regulation; <1.01V forces shutdown with 13µA quiescent current |
| MODE/SYNC | Mode select & external clock sync | Ground = forced continuous; float/INTVCC = Burst Mode®; driven clock = synchronized forced continuous |
| VFB1 / VFB2 | Feedback input | Compares output voltage (via resistor divider) against 0.6V reference to regulate output |
| PGOOD1 / PGOOD2 | Open-drain power-good status | Pulled low when VFB deviates >±8%; releases after return within ±5%, with 40µs glitch filter |
| TRACKSS1 / TRACKSS2 | Tracking & soft-start control | Sub-0.6V input enables output voltage ramping or sequencing; internal 1.4µA pull-up enables capacitor-based soft-start |
| TMON | Analog die temperature monitor | Outputs 1.5V at 25°C, scaling 200°C/V - connect to ADC for thermal management |
| BOOST1 / BOOST2 | Floating gate driver supply | Connect bootstrap capacitor between BOOST and SW to drive high-side MOSFET above VIN |
| SW1 / SW2 | Switch node | Connects to external inductor; swings from ~–0.3V to VIN during operation |
| VIN1 / VIN2 | Input power supply | Independent inputs allow dual-rail operation or redundancy; VIN2 functional down to 1.5V if VIN1 ≥3.1V |
| GND (Pins 12,18,19,25) | Power & signal ground | Must be tied together and soldered to PCB ground plane for thermal and EMI performance |
| INTVCC | Internal 3.3V LDO output | Supplies internal logic and drivers; requires ≥4.7µF ceramic decoupling to GND |
| RT | Oscillator frequency set | Resistor to GND programs fSW: 162kΩ → ~2MHz; 80.6kΩ → ~4MHz; tie to INTVCC for default 2MHz |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel interleaved operation | Enables >6A single-output rails with reduced input RMS current and smaller input capacitors |
| Controlled on-time current-mode architecture | Delivers consistent switching frequency and excellent transient response across wide VIN/VOUT ratios |
| Burst Mode® with 600µA sleep current | Extends battery life in portable instruments by minimizing light-load quiescent power dissipation |
| Integrated die temperature monitor (TMON) | Provides analog voltage output (200°C/V) for real-time thermal profiling without external sensors |
| Independent channel protection | Per-channel VIN overvoltage lockout (22.5V trip), short-circuit limiting, and overtemperature shutdown |
| AEC-Q100 qualified | Validated for automotive applications including infotainment and ADAS power domains |
Applications
| Industrial PLC I/O Modules | Automotive Infotainment Systems |
|---|---|
Use Scenario: Powering isolated digital I/O banks and analog sensor interfaces in modular control cabinets with 12V/24V DC input. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing independent 3.3V and 5V rails with sequencing via TRACKSS pins. Use Value: Eliminates need for discrete regulators and external sequencing ICs; reduces BOM count and layout area by 40% versus dual single-channel solutions. | Use Scenario: Supplying processor cores, DDR memory, and display interfaces in head-unit designs requiring AEC-Q100 compliance. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 1.2V @ 6A (core) and 1.8V @ 6A (memory) from 12V battery rail. Use Value: Achieves >92% efficiency at 4A load under 85°C ambient, reducing thermal stress on adjacent RF modules and display drivers. |
| Test & Measurement Equipment | High-Density Server PMBus Modules |
Use Scenario: Generating precision low-noise analog supply rails (±0.5% regulation) for ADC/DAC front-ends in portable oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Dual-channel regulator operating in forced continuous mode to minimize output ripple and switching noise coupling into sensitive analog paths. Use Value: Delivers <10mVpp output ripple at 6A with external LC filtering, meeting EN 61326-1 conducted emission limits without shielding. | Use Scenario: Implementing scalable, digitally monitored 12V-to-0.8V/1.8V conversion in multi-slot server backplanes with PMBus interface. IC Role / Device Role / Timing Role: Dual-buck controller used in parallel configuration (interleaved) to deliver 12A @ 0.8V with thermal derating margin. Use Value: Enables single-chip solution for high-current CPU/GPU rails with built-in TMON telemetry and PGOOD status for system-level fault logging. |
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 |
|---|---|---|---|
| MPQ4436GL-A | Single-channel 6A buck; no integrated TMON or TRACKSS; fixed 500kHz–3MHz frequency range | Lacks dual-channel integration and analog temperature monitoring; requires two devices for same functionality | Select when cost sensitivity outweighs integration benefits and thermal telemetry is unnecessary |
| TPS546B24RVFT | Single-channel 15A buck with PMBus; supports 0.5V–3.3V output; no Burst Mode®, higher IQ (2.5mA) | Designed for digital power systems with telemetry; lacks dual independent channels and soft-start tracking | Select when digital control, telemetry, and higher single-rail current are required over analog flexibility |
Compared with MPQ4436GL-A and TPS546B24RVFT, the LTC3636IUFD#PBF uniquely delivers dual 6A channels with integrated die temperature monitoring, independent soft-start/tracking, and Burst Mode® operation - making it optimal for space-constrained, thermally aware, and battery-sensitive dual-rail systems where analog control and sequencing are critical.
Availability
LTC3636IUFD#PBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, test equipment, and high-density server power modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3636IUFD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3636IUFD#PBF belongs to the Power by Linear™ family of monolithic DC/DC regulators, engineered for high-efficiency, high-density point-of-load conversion in thermally constrained and dynamically loaded systems.
FAQ
What is the maximum supported switching frequency for LTC3636IUFD#PBF?
The LTC3636IUFD#PBF supports a programmable switching frequency from 500kHz to 4MHz using an external resistor on the RT pin. When RT is tied to INTVCC, the device defaults to approximately 2MHz. Operation up to 4MHz enables use of compact 0.56µH inductors and low-ESR ceramic capacitors, ideal for space-constrained layouts. The internal PLL ensures stable synchronization even under wide temperature and voltage variations.
Does LTC3636IUFD#PBF support output voltage tracking between channels?
Yes, the LTC3636IUFD#PBF supports independent output voltage tracking via the TRACKSS1 and TRACKSS2 pins. Applying a ramp voltage below 0.6V to either pin causes the corresponding channel's output to follow that voltage until reaching regulation. This enables precise power-up sequencing for FPGAs or processors with multiple voltage domains. An internal 1.4µA pull-up current allows simple RC-based soft-start implementation without external circuitry.
How does the die temperature monitor (TMON) function in LTC3636IUFD#PBF?
The TMON pin on the LTC3636IUFD#PBF outputs an analog voltage proportional to on-die temperature with a scaling factor of 200°C/V - e.g., 1.5V at 25°C. It is factory-calibrated and requires no external components. Connecting TMON to an ADC enables real-time thermal profiling and dynamic throttling. Tying TMON to INTVCC disables the monitor. This feature provides direct insight into thermal performance without adding discrete sensors or calibration overhead.
Can LTC3636IUFD#PBF operate with different input voltages on VIN1 and VIN2?
Yes, the LTC3636IUFD#PBF supports independent input supplies: VIN1 operates from 3.1V to 20V, while VIN2 functions from 1.5V to 20V when VIN1 ≥3.1V. This allows flexible power architecture design - such as using a boosted 5V rail for one channel and a direct 12V bus for the other - without cross-regulation or coupling issues. Each channel maintains full protection (OVP, OTP, SCP) independently under split-input conditions.
What protection features are integrated into LTC3636IUFD#PBF?
The LTC3636IUFD#PBF integrates comprehensive protection: per-channel VIN overvoltage lockout (22.5V trip), valley-current limit (6.6A typical), short-circuit foldback, overtemperature shutdown, and open-drain PGOOD outputs with ±8% fault detection and 40µs filtering. It also includes undervoltage lockout on INTVCC (2.7V rising) and RUN pins (1.16V rising), plus ESD protection rated at ±1500V HBM. These features ensure robust operation in harsh environments without external supervision circuitry.
LTC3636IUFD#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)
LTC3636IUFD#PBF FAQ
1.How can I place an order for LTC3636IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3636IUFD#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 LTC3636IUFD#PBF reliable?
The price and inventory of LTC3636IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3636IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3636IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3636IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3636IUFD#PBF?
LTC3636IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3636IUFD#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 LTC3636IUFD#PBF?
For technical support, including LTC3636IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3636IUFD#PBF requirements.
6.How does Aetrix verify that LTC3636IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3636IUFD#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 LTC3636IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3636IUFD#PBF?
All LTC3636IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3636IUFD#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 LTC3636IUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3636IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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