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Analog Devices Inc. LTC3604EUD#PBF
- Part No.:
- LTC3604EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3604EUD#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,785
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Product details
Overview
LTC3604EUD#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator delivering up to 2.5A output current with 3.6V–15V input range, 0.6V reference, and programmable switching frequency from 800kHz to 4MHz. It employs current-mode control with controlled on-time architecture for fast transient response and supports both Burst Mode® (300µA no-load IQ) and forced continuous operation in a thermally enhanced 16-pin 3mm × 3mm QFN package.
For engineers reviewing the LTC3604EUD#PBF datasheet, LTC3604EUD#PBF pinout, LTC3604EUD#PBF application, or LTC3604EUD#PBF equivalent, key selection considerations include its 2.5A output capability, ±8% PGOOD threshold, 20ns minimum on-time, valley current limit of 2.6A–4.3A, and external frequency synchronization via MODE/SYNC pin - all critical for high-efficiency point-of-load and battery-powered systems.
Technical Context
The LTC3604EUD#PBF uses a phase-lockable controlled on-time, current-mode architecture where the top MOSFET's on-time is servoed by an internal PLL to match either an internal oscillator (set by RT resistor) or an external clock applied to MODE/SYNC. This enables stable constant-frequency operation even at very low duty cycles (e.g., 5% at 2.25MHz), making it suitable for high step-down ratio applications.
It integrates dual power MOSFETs (130mΩ high-side, 100mΩ low-side), a 3.3V INTVCC regulator, and analog circuitry including error amplifier (2.0mS transconductance), valley current comparator, and tracking/soft-start control. Protection features include VIN overvoltage lockout (16.5V–17.5V hysteresis), short-circuit foldback, and thermal shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 15V - supports wide-input industrial and Li-ion battery systems without pre-regulation. |
| Max Output Current | 2.5A - sufficient for FPGA core rails, DSP supplies, and multi-rail embedded processors. |
| Switching Frequency | 800kHz to 4MHz - adjustable via RT resistor; enables compact magnetics and noise-sensitive layout optimization. |
| Efficiency | Up to 95% - achieved at mid-load with optimized inductor and ceramic capacitors. |
| No-Load Quiescent Current | 300µA in Burst Mode® - extends battery life in always-on instrumentation and IoT edge nodes. |
| Reference Voltage | 0.600V ±0.006V - enables precise low-voltage outputs (e.g., 0.8V, 1.0V, 1.2V) with standard resistor dividers. |
| Power Good Threshold | ±8% (bad-to-good: ±5%) - provides robust output monitoring with 40µs filtering to suppress transient glitches. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed PGND pad (Pin 17), θJA = 45°C/W. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (1) | Mode control & sync input | Ground = forced continuous; float or INTVCC = Burst Mode®; external clock = synchronized forced continuous. |
| PGOOD (2) | Open-drain status output | Pulled low when FB deviates >±8% from 0.6V; high-impedance when within ±5% - used for system power sequencing. |
| SW (3,4) | Switch node | Connects to inductor; swings from PGND to VIN - requires low-inductance layout to minimize EMI and shoot-through risk. |
| BOOST (6) | Floating gate drive supply | Connects to bootstrap capacitor (+) terminal; enables high-side MOSFET drive above VIN. |
| INTVCC (7) | Internal 3.3V regulator output | Must be decoupled with ≥1µF ceramic cap to SGND - powers internal logic and gate drivers. |
| VON (8) | On-time voltage input | Connects to VOUT to make on-time proportional to output voltage - improves line regulation. |
| SGND (9) | Signal ground reference | Low-noise return for FB divider, compensation network, and RT resistor - separate from PGND except at single-point connection. |
| RT (10) | Oscillator programming | Resistor to SGND sets frequency (80kΩ–400kΩ = 4MHz–800kHz); tie to INTVCC for default 2MHz. |
| FB (11) | Feedback input | Compares resistive divider output to 0.6V reference - determines regulated output voltage. |
| ITH (12) | Error amp output & compensation | Connects to RC network for loop stability; tie to INTVCC for internal compensation. |
| TRACK/SS (13) | Tracking & soft-start | Voltage <0.6V forces output tracking; internal 1.4µA pull-up enables soft-start with external capacitor. |
| RUN (14) | Enable input | High >1.25V enables operation; low <1.0V disables - must not be left floating. |
| VIN (15,16) | Main power input | 3.6V–15V supply; requires ≥10µF low-ESR ceramic bypass to PGND close to pins. |
| PGND (17) | Power ground | Exposed pad - must be soldered to PCB ground plane for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 300µA while maintaining regulation - critical for battery runtime in standby mode. |
| External frequency synchronization | Enables noise-sensitive systems (e.g., RF, audio) to align switching edges with system clock - eliminates beat frequencies. |
| Output voltage tracking | Allows coordinated power-up of multiple rails using a master reference - essential for multi-core SoCs and FPGAs. |
| Valley current limit protection | Programmable 2.6A–4.3A limit with negative current detection - prevents reverse inductor current in forced continuous mode. |
| Integrated BOOST and INTVCC regulators | Eliminates need for external bias supplies - simplifies BOM and reduces board space for self-contained buck design. |
Applications
| Distributed Power Systems | Lithium-Ion Battery-Powered Instruments |
|---|---|
Use Scenario: Point-of-load conversion in telecom baseband cards with multiple voltage domains (1.2V, 1.8V, 3.3V). IC Role / Device Role / Timing Role: Primary synchronous buck regulator supplying FPGA core voltage with tight load transient response. Use Value: Controlled on-time architecture delivers <10µs recovery from 2.5A load step - maintains signal integrity during burst data processing. | Use Scenario: Portable medical monitor requiring long battery life and clean analog supply rails. IC Role / Device Role / Timing Role: Main system regulator converting single-cell Li-ion (3.0–4.2V) to 3.3V for microcontroller and sensors. Use Value: Burst Mode® operation achieves 300µA quiescent current - extends battery runtime beyond 72 hours in sleep mode. |
| Point-of-Load Power Supplies | Industrial Control Modules |
Use Scenario: Compact PLC I/O module needing isolated 5V and 3.3V rails from 24V bus. IC Role / Device Role / Timing Role: High-efficiency buck stage stepping 24V down to 5V before secondary LDOs. Use Value: 95% peak efficiency at 2A load minimizes thermal stress in sealed enclosures - avoids derating at 60°C ambient. | Use Scenario: Factory automation sensor node with CAN interface and real-time processor. IC Role / Device Role / Timing Role: Regulator powering ARM Cortex-M7 core and CAN transceiver from 12V field bus. Use Value: External SYNC capability allows alignment with CAN bit timing - eliminates conducted EMI coupling into differential bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | Higher 42V max input, lower 3.5A max output, 200ns min on-time, Silent Switcher® architecture. | Better EMI performance required; higher input voltage needed (e.g., automotive 24V systems). | Select LT8610EMSE#PBF when input exceeds 15V or radiated emissions must meet CISPR 25 Class 5. |
| TPS54227PWPR | Lower 17V max input, fixed 2.2MHz frequency, no external SYNC, 2.2A max output, integrated compensation. | Simpler design with fewer external components; cost-sensitive volume production. | Select TPS54227PWPR when board space and BOM count are prioritized over flexibility and light-load efficiency. |
Compared with LT8610EMSE#PBF and TPS54227PWPR, the LTC3604EUD#PBF offers superior light-load efficiency via Burst Mode®, precise output tracking, and wider frequency adjustability - making it optimal for battery-powered and multi-rail precision systems where dynamic performance and sequencing matter most.
Availability
LTC3604EUD#PBF is available at Aetrix Electronics and suitable for distributed power systems, lithium-ion battery-powered instruments, and point-of-load power supplies requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC3604EUD#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 acquired Linear Technology in 2017 and continues its legacy of high-performance power management ICs with rigorous reliability testing and automotive-grade qualification.
The LTC3604EUD#PBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for high-efficiency, high-transient-response point-of-load conversion in space-constrained and thermally demanding applications.
FAQ
What is the maximum input voltage rating for the LTC3604EUD#PBF?
The LTC3604EUD#PBF has an absolute maximum input voltage rating of 16V, with overvoltage lockout activating at 17.5V (rising) and releasing at 16.5V (falling). Continuous operation is specified from 3.6V to 15V. Exceeding 16V risks permanent damage per Absolute Maximum Ratings, and transient spikes above 18V are not allowed even briefly.
Does the LTC3604EUD#PBF support output voltage tracking, and how is it implemented?
Yes, the LTC3604EUD#PBF supports output voltage tracking via the TRACK/SS pin. Applying a voltage below 0.6V to this pin overrides the internal reference and forces the FB pin to follow that voltage. An internal 1.4µA pull-up current from INTVCC enables soft-start when an external capacitor is connected between TRACK/SS and ground - allowing controlled ramp-up of multiple rails.
What is the purpose of the VON pin on the LTC3604EUD#PBF, and how should it be used?
The VON pin on the LTC3604EUD#PBF sets the on-time comparator trip point. Connecting VON directly to the regulated output makes the on-time proportional to VOUT, improving line regulation and reducing output voltage variation across input voltage changes - especially beneficial in wide-input applications like 12V industrial buses.
Can the LTC3604EUD#PBF operate with an external clock, and what happens to its mode selection when synchronized?
Yes, the LTC3604EUD#PBF accepts an external clock on the MODE/SYNC pin. When synchronized, the internal PLL locks to the external frequency and phase, and the device defaults to forced continuous operation regardless of MODE/SYNC pin DC bias - ensuring deterministic switching behavior for EMI-sensitive designs.
What thermal considerations apply to the LTC3604EUD#PBF in its QFN package?
The LTC3604EUD#PBF in the 3mm × 3mm QFN package has θJA = 45°C/W. Its exposed PGND pad (Pin 17) must be soldered to a PCB copper pour for effective heat dissipation. Without proper thermal land design, junction temperature can exceed 125°C under 2.5A load at elevated ambient - triggering thermal shutdown and disrupting regulation.
LTC3604EUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 14.52V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 2MHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3604EUD#PBF FAQ
1.How can I place an order for LTC3604EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3604EUD#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 LTC3604EUD#PBF reliable?
The price and inventory of LTC3604EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3604EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3604EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3604EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3604EUD#PBF?
LTC3604EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3604EUD#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 LTC3604EUD#PBF?
For technical support, including LTC3604EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3604EUD#PBF requirements.
6.How does Aetrix verify that LTC3604EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3604EUD#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 LTC3604EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3604EUD#PBF?
All LTC3604EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3604EUD#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 LTC3604EUD#PBF part is unused and in its original packaging.
Return procedure for LTC3604EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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