My Inquiry
My Account
Analog Devices Inc. LTC3636IUFD-1#PBF
- Part No.:
- LTC3636IUFD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3636IUFD-1#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A DL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,485
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3636IUFD-1#PBF 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. It serves as a high-density point-of-load power supply in automotive ADAS modules, industrial PLC I/O cards, and battery-powered test equipment requiring dual-rail regulation.
For engineers reviewing the LTC3636IUFD-1#PBF datasheet, LTC3636IUFD-1#PBF pinout, LTC3636IUFD-1#PBF application, or LTC3636IUFD-1#PBF equivalent, key selection considerations include its AEC-Q100 qualification, phase-interleaved dual-channel architecture, 0.6V internal reference with ±1% tracking accuracy, and support for external synchronization to avoid EMI coupling in noise-sensitive systems.
Technical Context
The LTC3636IUFD-1#PBF implements a controlled on-time current mode architecture with phase-locked loop (PLL) synchronization capability, enabling stable operation at high step-down ratios while maintaining fast transient response. Its dual channels operate 180° out of phase to reduce input RMS current and ripple, and each features independent RUN enable, PGOOD status, and TRACKSS soft-start/tracking control.
It integrates top and bottom MOSFETs with 32mΩ/18mΩ RDS(ON), supports both Burst Mode® (600µA sleep current) and forced continuous operation, and includes comprehensive protection: VIN overvoltage lockout (22.5V trip), overtemperature shutdown, short-circuit limiting (6.6A typical valley limit), and power-good filtering (40µs debounce).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V per channel - supports single-cell Li-ion up to 12V/24V industrial rails without pre-regulation. |
| VOUT Range | 1.8V to 12V - fixed for LTC3636-1 variant; enables direct generation of FPGA core, DDR, and peripheral I/O rails. |
| Output Current | 6A per channel - sustained delivery with thermal derating above 85°C ambient on standard 6-layer PCB. |
| Switching Frequency | 500kHz to 4MHz - programmable via RT resistor; allows optimization between small magnetics (high-f) and peak efficiency (low-f). |
| Efficiency | Up to 95% - achieved at 6A load, 12VIN/3.3VOUT, 2MHz, using 0.56µH inductors and low-ESR ceramic output caps. |
| Reference Voltage | 0.6V ±1% - enables precise output setting down to 1.8V with standard resistor dividers; line/load regulation <0.05%. |
| Thermal Monitoring | TMON output: 1.5V at 25°C, 200°C/V slope - provides real-time die temperature readback for system-level thermal management. |
Pinout & Package
Package: 4mm × 5mm, 28-lead plastic QFN (UFD) with exposed thermal pad; rated for –40°C to 125°C junction temperature; θJA = 21°C/W on DC2335 demo board.
| 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 - avoids external component count. |
| RUN1 / RUN2 | Channel enable input | Active-high logic (1.22V threshold); controls independent startup sequencing and fault isolation per rail. |
| MODE/SYNC | Mode select & external clock input | Ground = forced continuous; float/INTVCC = Burst Mode®; driven clock = PLL-synchronized operation at exact frequency. |
| VFB1 / VFB2 | Feedback input | Compares output divider voltage to 0.6V reference; sets regulated output with ±0.6% initial accuracy and ±8% PGOOD window. |
| PGOOD1 / PGOOD2 | Open-drain power-good status | Asserts low when VFB deviates >±8%; releases after return within ±5% - enables safe power sequencing with 40µs glitch immunity. |
| TRACKSS1 / TRACKSS2 | Tracking/soft-start input | Accepts external voltage ramp for controlled output rise; internal 1.4µA pull-up enables capacitor-based soft-start timing. |
| BOOST1 / BOOST2 | Floating gate driver supply | Connected to bootstrap capacitor; sustains high-side MOSFET drive during 100% duty cycle - critical for low-VOUT operation. |
| TMON | Digital die temperature monitor | Analog voltage output (1.5V @ 25°C, 200°C/V) - enables closed-loop thermal throttling or predictive maintenance in automotive ECUs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase interleaving | Channels run 180° out of phase - cuts input ripple current by ~70%, reducing required CIN size and EMI filter complexity. |
| AEC-Q100 qualification | Rated for automotive Grade 1 (–40°C to +125°C) - validated for engine control units, infotainment power supplies, and ADAS camera modules. |
| Programmable burst mode | 600µA quiescent current at light load - extends battery life in portable instrumentation without sacrificing transient response. |
| Integrated overvoltage protection | VIN-OV lockout at 22.5V rising edge - prevents damage from load dump transients in 12V/24V vehicle electrical systems. |
| Independent channel control | Separate RUN, PGOOD, TRACKSS, and VFB pins - enables asymmetric rail sequencing (e.g., core before I/O) and fault containment. |
Applications
| Automotive ADAS Camera Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for CMOS image sensor (1.2V core) and serializer IC (3.3V interface) in rear-view camera ECU. IC Role / Device Role / Timing Role: Primary point-of-load regulator providing isolated, sequenced, and monitored 1.2V/3.3V outputs from 12V battery rail. Use Value: AEC-Q100 rating ensures reliability under automotive thermal cycling; PGOOD signals enable fail-safe sensor initialization. |
Use Scenario: Compact dual-output supply for analog input conditioning (5V) and microcontroller (3.3V) in DIN-rail mounted PLC module. IC Role / Device Role / Timing Role: Monolithic dual buck replacing discrete controllers and MOSFETs - reduces BOM count and layout area by 40%. Use Value: Interleaved operation lowers input ripple, eliminating need for large bulk capacitors; TMON output feeds into system thermal alarm. |
| Battery-Powered Test Instrument | Networking Line Card Bias Supply |
Use Scenario: Portable oscilloscope requiring clean, low-noise 1.8V FPGA core and 5V analog front-end rails from Li-ion pack (8–12.6V). IC Role / Device Role / Timing Role: High-efficiency dual buck with Burst Mode® to maximize runtime; SYNC pin locks switching to ADC sampling clock to suppress beat frequencies. Use Value: 95% peak efficiency extends battery life; 4MHz max frequency enables use of 0.47µH inductors for ultra-low profile design. |
Use Scenario: Distributed 12V-to-3.3V/5V conversion on telecom line card with strict EMI limits and thermal constraints. IC Role / Device Role / Timing Role: Dual-channel regulator operating in forced continuous mode with external clock sync to system bus - eliminates switching noise in adjacent RF sections. Use Value: Phase interleaving reduces input current harmonics; 28-pin QFN with thermal pad maintains <95°C junction temp at full load. |
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-Z | Single-channel 6A output; no dual-phase interleaving; 2.5V–18V input; fixed 3.3V/5V options only. | Lacks independent VOUT programming and channel sequencing - suitable only for identical-rail applications. | Select when needing AEC-Q100-rated single-rail supply with lower cost and simpler layout; not viable for asymmetric dual-rail designs. |
| TPS546B24RVFT | Single-channel 15A; digital PMBus interface; 4.5V–18V input; supports AVS and margining; no integrated TMON. | Requires external telemetry and configuration; higher pin count and firmware overhead; no native temperature monitoring analog output. | Choose for programmable, telemetry-enabled systems where dynamic voltage scaling and remote diagnostics outweigh analog simplicity. |
Compared with MPQ4436-AEC1-Z and TPS546B24RVFT, the LTC3636IUFD-1#PBF uniquely delivers two independently configurable 6A rails in one package with analog temperature monitoring, AEC-Q100 compliance, and hardware-based phase interleaving - making it optimal for space-constrained, thermally managed dual-rail automotive and industrial power systems.
Availability
LTC3636IUFD-1#PBF is available at Aetrix Electronics and suitable for automotive ADAS camera modules, industrial PLC I/O boards, and battery-powered test instruments requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3636IUFD-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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets with precision signal chain and power solutions.
The LTC3636IUFD-1#PBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, designed specifically for high-current, multi-rail point-of-load applications demanding compact size, high efficiency, and robust protection in harsh environments.
FAQ
What is the maximum output voltage supported by the LTC3636IUFD-1#PBF?
The LTC3636IUFD-1#PBF is the -1 variant of the LTC3636 family and supports a fixed output voltage range of 1.8V to 12V. This differs from the base LTC3636 (non–1) which supports 0.6V to 5V. The 1.8V minimum ensures compatibility with modern FPGA, ASIC, and processor I/O rails while maintaining regulation stability across temperature and load.
Does the LTC3636IUFD-1#PBF support synchronization to an external clock?
Yes, the LTC3636IUFD-1#PBF supports external clock synchronization via the MODE/SYNC pin. When driven with a clean CMOS clock signal, its internal phase-locked loop (PLL) forces the bottom NMOS turn-on edge to align with the rising edge of the external clock - enabling deterministic EMI reduction and elimination of beat frequencies in multi-regulator systems.
How does the TMON pin function on the LTC3636IUFD-1#PBF?
The TMON pin on the LTC3636IUFD-1#PBF provides an analog voltage proportional to die temperature, with a nominal 1.5V output at 25°C and a linear slope of 200°C/V. It can be read directly by an external ADC to implement thermal throttling or system-level fault detection - and tying TMON to INTVCC disables the monitor circuit entirely.
What protection features are integrated into the LTC3636IUFD-1#PBF?
The LTC3636IUFD-1#PBF integrates VIN overvoltage lockout (22.5V trip), overtemperature shutdown, short-circuit current limiting (6.6A typical valley limit), and open-drain PGOOD outputs with 40µs filtering. It also includes undervoltage lockout on INTVCC and RUN pins, plus reverse current blocking during shutdown - all without requiring external components.
Can the two channels of the LTC3636IUFD-1#PBF be paralleled for higher current?
Yes, the LTC3636IUFD-1#PBF supports dual-phase parallel operation for single-output applications requiring >6A. Channels must be configured 180° out of phase by tying RUN, VFB, TRACKSS, and ITH pins together (with external compensation), and operating above 800kHz for stability - enabling up to 12A with reduced input/output ripple and balanced thermal loading.
LTC3636IUFD-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)
LTC3636IUFD-1#PBF FAQ
1.How can I place an order for LTC3636IUFD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3636IUFD-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 LTC3636IUFD-1#PBF reliable?
The price and inventory of LTC3636IUFD-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 LTC3636IUFD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3636IUFD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3636IUFD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3636IUFD-1#PBF?
LTC3636IUFD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3636IUFD-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 LTC3636IUFD-1#PBF?
For technical support, including LTC3636IUFD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3636IUFD-1#PBF requirements.
6.How does Aetrix verify that LTC3636IUFD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3636IUFD-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 LTC3636IUFD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3636IUFD-1#PBF?
All LTC3636IUFD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3636IUFD-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 LTC3636IUFD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3636IUFD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3636IUFD-1#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
