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Analog Devices Inc. LTC3604IMSE#TRPBF
- Part No.:
- LTC3604IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3604IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,543
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Product details
Overview
LTC3604IMSE#TRPBF 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 800kHz–4MHz switching frequency in a 16-pin MSOP package. It supports Burst Mode® operation (300µA no-load IQ) and forced continuous mode for low-ripple applications such as point-of-load power in battery-powered instrumentation.
For engineers reviewing the LTC3604IMSE#TRPBF datasheet, LTC3604IMSE#TRPBF pinout, LTC3604IMSE#TRPBF application, or LTC3604IMSE#TRPBF equivalent, key selection considerations include its controlled on-time current-mode architecture, external frequency synchronization capability, PGOOD status output, output voltage tracking, and thermal performance in the MSOP package (θJA = 38°C/W).
Technical Context
The LTC3604IMSE#TRPBF uses a phase-lockable controlled on-time, current-mode architecture with internal PLL alignment of top MOSFET on-time to internal or external clock edges-enabling stable high-frequency operation even at very low duty cycles (5% at 2.25MHz). Its error amplifier drives ITH to regulate valley inductor current via feedback from FB against a 0.6V reference.
It integrates dual N-channel MOSFETs (130mΩ top / 100mΩ bottom), a 3.3V INTVCC LDO, and protection features including VIN overvoltage lockout (16.5V–17.5V), short-circuit foldback limiting (ILIM = 2.6A–4.3A), and thermal shutdown. MODE/SYNC pin selects between Burst Mode® (high efficiency at light load) and forced continuous mode (low ripple, constant frequency).
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. |
| Output Current | 2.5A continuous - sufficient for FPGA core rails, DSP supplies, and multi-rail embedded processors. |
| Switching Frequency | 800kHz to 4MHz (resistor-programmable) - enables compact magnetics and noise-sensitive layout control. |
| Efficiency | Up to 95% - achieved at mid-load with optimized inductor/capacitor selection and low RDS(ON) FETs. |
| No-Load Quiescent Current | 300µA in Burst Mode® - extends battery life in always-on portable instruments. |
| Reference Voltage | 0.600V ±6mV - enables precise low-output-voltage regulation (e.g., 0.8V, 1.2V) with standard resistor dividers. |
| Power Good Output | Open-drain PGOOD with ±8% fault threshold and 40µs filter - provides reliable system sequencing and fault detection. |
Pinout & Package
Package: 16-Lead Plastic MSOP (3mm × 4.9mm), exposed pad (Pin 17) connected to SGND, θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (Pin 15) | Mode control & sync input | Ground = forced continuous; float or INTVCC = Burst Mode®; external clock = synchronized forced continuous. |
| PGOOD (Pin 16) | Open-drain status output | Pulled low when FB deviates >±8% from 0.6V; high-impedance when within ±5% - used for power sequencing. |
| SW (Pins 1,2) | Switch node | Connects to inductor; swings from PGND to VIN - requires low-inductance layout and proper boost capacitor routing. |
| BOOST (Pin 5) | Floating gate drive supply | Connects (+) of bootstrap cap to SW (–); supplies top FET gate drive above VIN - critical for high-side conduction. |
| INTVCC (Pin 6) | Internal 3.3V LDO output | Must be decoupled with ≥1µF ceramic to SGND - powers internal circuitry and can source limited external bias. |
| VON (Pin 7) | On-time voltage input | Connected to VOUT to make on-time proportional to output voltage - stabilizes regulation across line/load changes. |
| SGND (Exposed Pad Pin 17) | Signal ground reference | Low-noise return for FB divider, RT, compensation network - must be soldered to PCB for thermal and noise integrity. |
| RT (Pin 8) | Oscillator frequency set | Resistor to SGND programs fSW (80kΩ–400kΩ → 4MHz–800kHz); tie to INTVCC for default 2MHz. |
| FB (Pin 9) | Feedback input | Compares resistive divider output to 0.6V reference - sets regulated VOUT (e.g., 3.3V with 56.2kΩ/11.5kΩ). |
| ITH (Pin 10) | Error amp output & compensation | Loop compensation node - connect RC network for stability; tie to INTVCC for internal compensation. |
| TRACK/SS (Pin 11) | Tracking & soft-start input | Below 0.6V: forces FB to TRACK voltage; above 0.6V: reverts to internal reference - enables output voltage ramp-up or sequencing. |
| RUN (Pin 12) | Enable input | ≥1.25V enables operation; ≤1.0V disables - must not be left floating; internal hysteresis prevents chatter. |
| VIN (Pins 13,14) | Main power input | 3.6V–15V supply - requires ≥10µF low-ESR ceramic bypass to PGND close to pins. |
| PGND (Pins 3,4) | Power ground return | Return path for CIN, COUT, and internal FETs - low-impedance connection essential for EMI and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Controlled on-time current-mode architecture | Enables stable operation at ultra-low duty cycles (e.g., 5% at 2.25MHz) and fast transient response without slope compensation. |
| Burst Mode® operation | Reduces no-load IQ to 300µA while maintaining regulation - ideal for battery standby modes in portable medical devices. |
| External frequency synchronization | Accepts external clock 800kHz–4MHz to eliminate beat frequencies in multi-rail systems - avoids EMI peaks in sensitive RF sections. |
| Output voltage tracking capability | Allows coordinated startup/shutdown with other regulators via TRACK/SS pin - required for FPGA or ASIC core/I/O rail sequencing. |
| Integrated power MOSFETs | 130mΩ top / 100mΩ bottom switches - eliminate external FETs and gate drivers, reducing BOM count and layout complexity. |
| Short-circuit foldback protection | Reduces ILIM to ~1.3A during output short - limits power dissipation and prevents thermal runaway during fault conditions. |
Applications
| Distributed Power Systems | Lithium-Ion Battery-Powered Instruments |
|---|---|
Use Scenario: Point-of-load conversion in multi-board telecom shelf with tight board space and strict EMI limits. IC Role / Device Role / Timing Role: Primary 2.5A buck regulator generating 1.2V core supply for FPGA or ASIC from 5V or 12V backplane. Use Value: Programmable 2MHz–4MHz switching enables small 0.68µH inductors and low-profile ceramic capacitors, meeting Class B radiated emissions. |
Use Scenario: Portable handheld test equipment powered by single-cell Li-ion (3.0V–4.2V) requiring stable 3.3V and 1.8V rails. IC Role / Device Role / Timing Role: Main 3.3V/2.5A supply with Burst Mode® for microcontroller sleep states and forced continuous for active measurement phases. Use Value: 300µA no-load IQ extends battery runtime in standby; PGOOD ensures clean reset assertion before processor wake-up. |
| Point-of-Load Power Supplies | Industrial Embedded Controllers |
Use Scenario: Compact PLC I/O module needing isolated 5V and non-isolated 3.3V from 24V DC input. IC Role / Device Role / Timing Role: Secondary 3.3V/2.5A regulator after front-end isolation, using TRACK/SS to sequence with isolated 5V rail. Use Value: Tracking function guarantees monotonic startup, preventing latch-up in mixed-voltage logic interfaces (e.g., RS-485 transceivers). |
Use Scenario: Fanless edge gateway with ARM Cortex-A processor requiring robust 1.1V core and 1.8V memory supply in harsh ambient (–40°C to 85°C). IC Role / Device Role / Timing Role: High-reliability buck converter with VIN OV protection (17.5V clamp) and thermal shutdown - operates continuously in sealed enclosure. Use Value: Guaranteed –40°C to 125°C junction operation (LTC3604I grade) and 38°C/W MSOP θJA ensure stable performance without forced air cooling. |
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 |
|---|---|---|---|
| TPS54229EVM-509 (Texas Instruments) | 2.5A, 4.5V–18V input, fixed 500kHz/2.2MHz options, no external sync, higher 575µA IQ in Eco-mode | Lacks TRACK/SS and external frequency sync; simpler design but less flexible for noise-sensitive or sequenced systems | Select if cost sensitivity outweighs need for tracking or synchronization; verify thermal margin in MSOP-equivalent layout. |
| MP2315DJ-LF-Z (Monolithic Power Systems) | 2.5A, 4.5V–18V input, 350kHz–2.5MHz adjustable, no PGOOD or TRACK, 350µA IQ in skip mode | Missing PGOOD status and output tracking - unsuitable for systems requiring power sequencing or fault reporting | Choose only for basic fixed-output applications where monitoring and sequencing are handled externally. |
Compared with LTC3604IMSE#TRPBF, the TPS54229EVM-509 offers lower BOM cost but sacrifices critical features like external sync and tracking, while the MP2315DJ-LF-Z lacks PGOOD and tracking entirely - making LTC3604IMSE#TRPBF uniquely suited for high-integrity, multi-rail embedded power systems requiring coordination, low-noise operation, and robust fault signaling.
Availability
LTC3604IMSE#TRPBF 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, long-term lifecycle support, and guaranteed industrial temperature grade (–40°C to 125°C).
Supply support for LTC3604IMSE#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 acquired Linear Technology in 2017 and maintains its precision power portfolio with rigorous automotive and industrial qualification standards.
The LTC3604IMSE#TRPBF belongs to Linear's high-efficiency monolithic buck regulator product line, designed specifically for space-constrained, noise-sensitive, and battery-critical applications demanding high light-load efficiency, accurate tracking, and robust protection.
FAQ
What is the maximum recommended operating junction temperature for LTC3604IMSE#TRPBF?
The LTC3604IMSE#TRPBF has a maximum operating junction temperature of 125°C. Its MSOP package exhibits θJA = 38°C/W, so ambient temperature must be derated based on power dissipation. For continuous 2.5A operation at high VIN/VOUT ratios, thermal vias under the exposed SGND pad and copper pour are strongly recommended to maintain safe TJ.
Does LTC3604IMSE#TRPBF support output voltage tracking, and how is it implemented?
Yes, LTC3604IMSE#TRPBF supports output voltage tracking via the TRACK/SS pin (Pin 11). 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 allows soft-start by connecting an external capacitor to ground - enabling controlled ramp-up or coordinated sequencing with other regulators.
What is the purpose of the VON pin on LTC3604IMSE#TRPBF, and how should it be connected?
The VON pin (Pin 7) sets the on-time comparator trip point to make the regulator's on-time proportional to the output voltage. For standard operation, LTC3604IMSE#TRPBF datasheet recommends connecting VON directly to VOUT. This improves line and load regulation by compensating for variations in input voltage and load current through adaptive on-time control.
Can LTC3604IMSE#TRPBF be synchronized to an external clock, and what is the valid frequency range?
Yes, LTC3604IMSE#TRPBF supports external synchronization via the MODE/SYNC pin (Pin 15). When driven with a clean CMOS clock signal, its internal PLL locks to frequencies from 800kHz to 4MHz - matching its internal programmable range. During sync, the device defaults to forced continuous mode, eliminating frequency jitter and enabling deterministic EMI filtering.
What protection features are integrated into LTC3604IMSE#TRPBF?
LTC3604IMSE#TRPBF integrates VIN overvoltage lockout (16.5V–17.5V), short-circuit foldback current limiting (reducing ILIM to ~1.3A), thermal shutdown, and undervoltage lockout on INTVCC (2.45V–2.9V). It also features PGOOD status with ±8% fault detection and 40µs glitch filtering - providing comprehensive fault coverage without external components.
LTC3604IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-MSOP-EP
LTC3604IMSE#TRPBF FAQ
1.How can I place an order for LTC3604IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3604IMSE#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 LTC3604IMSE#TRPBF reliable?
The price and inventory of LTC3604IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3604IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3604IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3604IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3604IMSE#TRPBF?
LTC3604IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3604IMSE#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 LTC3604IMSE#TRPBF?
For technical support, including LTC3604IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3604IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3604IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3604IMSE#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 LTC3604IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3604IMSE#TRPBF?
All LTC3604IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3604IMSE#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 LTC3604IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3604IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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