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Analog Devices Inc. LTC3604IMSE#PBF
- Part No.:
- LTC3604IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3604IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,165
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Product details
Overview
LTC3604IMSE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, monolithic synchronous step-down DC/DC regulator delivering up to 2.5A output current with 3.6V–15V input range, 0.6V reference voltage, 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-lead MSOP package.
For engineers reviewing the LTC3604IMSE#PBF datasheet, LTC3604IMSE#PBF pinout, LTC3604IMSE#PBF application, or LTC3604IMSE#PBF equivalent, key selection considerations include its phase-lockable oscillator, power-good status output, output voltage tracking capability, short-circuit protection with foldback, and thermal performance in the MSOP package (θJA = 38°C/W).
Technical Context
The LTC3604IMSE#PBF uses a constant-frequency, controlled-on-time current-mode architecture with an internal phase-locked loop that aligns top-MOSFET on-time to either an internal oscillator (set by RT resistor) or external synchronization signal applied to MODE/SYNC. This enables stable high-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 N-channel MOSFETs (130mΩ high-side, 100mΩ low-side), a 3.3V INTVCC regulator, valley-current limiting (2.6A–4.3A), and precision feedback control referenced to 0.6V ±1%. The device features dual operational modes-Burst Mode® for light-load efficiency and forced continuous mode for low ripple-and includes dedicated pins for soft-start/tracking (TRACK/SS), error amplifier compensation (ITH), and on-time programming (VON).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 15V - supports wide-input industrial and battery-powered systems including Li-ion (3.7V nominal) and 12V rail inputs. |
| Max Output Current | 2.5A - sustained DC load capability with integrated MOSFETs; limited by thermal design and PCB copper area in MSOP package. |
| Switching Frequency | 800kHz to 4MHz - set via RT resistor (80kΩ–400kΩ); enables compact magnetics and noise-sensitive system partitioning. |
| Efficiency | Up to 95% - achieved at mid-to-heavy loads; Burst Mode® delivers 300µA no-load IQ for ultra-low standby power. |
| Reference Voltage | 0.600V ±1% - enables precise low-output-voltage regulation (e.g., 0.8V, 1.2V, 1.8V) using standard resistor dividers. |
| Protection Features | Short-circuit foldback, VIN overvoltage lockout (17.5V trip), thermal shutdown, and PGOOD status - ensures robust operation under fault conditions. |
| Package | 16-Lead Plastic MSOP - exposed pad soldered to SGND for thermal management; θJA = 38°C/W enables >1.5W dissipation with proper layout. |
Pinout & Package
Package: 16-Lead Plastic MSOP (MSE) with exposed pad (Pin 17) connected to SGND; requires soldering of exposed pad for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1, 2) | Switch Node | Connects to inductor; swings from PGND to VIN; drives external LC filter; critical for EMI and layout. |
| PGOOD (Pin 16) | Open-Drain Status Output | Pulled low when FB deviates >±8% from 0.6V; releases after return within ±5%; 40µs filter prevents false triggers during transients. |
| MODE/SYNC (Pin 15) | Mode Control / Clock Input | Ground = forced continuous; float or INTVCC = Burst Mode®; external clock = PLL-synchronized forced continuous operation. |
| VIN (Pins 13, 14) | Main Power Input | 3.6V–15V supply; requires ≥10µF low-ESR ceramic decoupling close to pins; handles peak switch currents. |
| RUN (Pin 12) | Enable Input | Active-high: >1.25V enables regulation; <1.0V disables (shutdown IQ = 14µA); must not be left floating. |
| TRACK/SS (Pin 11) | Tracking & Soft-Start | Sub-0.6V voltage overrides reference for sequencing; internal 1.4µA pull-up enables capacitor-based soft-start. |
| FB (Pin 9) | Feedback Input | Compares divider output to 0.6V reference; ±30nA bias current allows high-resistor-divider designs for low quiescent loss. |
| ITH (Pin 10) | Error Amplifier Output | Loop compensation node; connect RC network for stability; tie to INTVCC for internal compensation. |
| RT (Pin 8) | Oscillator Programming | Resistor to SGND sets frequency (80kΩ = 4MHz, 400kΩ = 800kHz); tie to INTVCC for default 2MHz (less stable vs temp/process). |
| VON (Pin 7) | On-Time Proportionality | Connect to VOUT to make on-time proportional to output voltage - improves line regulation in high-VIN applications. |
| INTVCC (Pin 6) | Internal 3.3V Regulator | Supplies gate drive and internal circuitry; requires ≥1µF ceramic decoupling to PGND; max load 5mA. |
| BOOST (Pin 5) | Bootstrap Supply | Connects to (+) of bootstrap cap (– to SW); supplies high-side gate driver; voltage = INTVCC + SW swing. |
| SGND (Pin 17, Exposed Pad) | Signal Ground | Low-noise reference for FB, ITH, RT, TRACK/SS; must be solidly connected to PCB ground plane. |
| PGND (Pins 3, 4) | Power Ground | High-current return path for input/output capacitors and bottom MOSFET; separate from SGND to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces no-load IQ to 300µA while maintaining regulation - extends battery life in always-on portable instruments. |
| Phase-Lockable Oscillator | Enables synchronization to system clock or noise-sensitive bands (e.g., ADC sampling windows) without jitter accumulation. |
| Output Voltage Tracking | Allows controlled ramp-up of LTC3604IMSE#PBF output to match another supply - essential for FPGA/CPU core sequencing. |
| Valley Current Limit | Programmable 2.6A–4.3A limit with negative current detection - prevents reverse inductor current in forced continuous mode. |
| Integrated Power Good | Dedicated open-drain PGOOD with ±8%/±5% thresholds and 40µs filtering - eliminates need for external supervisor IC. |
| Thermally Enhanced MSOP | Exposed SGND pad and low θJA (38°C/W) enable 1.8W+ power delivery in space-constrained layouts without heatsinks. |
Applications
| Point-of-Load Regulation | Lithium-Ion Powered Instruments |
|---|---|
Use Scenario: Providing clean, regulated 1.2V/2.5A to FPGA core logic in compact test equipment. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated core voltage with fast load-step response (<100µs recovery). Use Value: Controlled-on-time architecture maintains 2MHz switching under 2.5A load steps, minimizing output voltage deviation to <±30mV. |
Use Scenario: Powering handheld medical analyzers with single-cell Li-ion (3.0V–4.2V) input and 3.3V/2A system rail. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating across full battery range with Burst Mode® for >100h standby. Use Value: 95% peak efficiency at 2A and 300µA no-load IQ extend runtime; VIN OV lockout protects against charger transients. |
| Distributed Power Systems | Industrial Sensor Nodes |
Use Scenario: Local 5V/2A supply derived from 12V backplane in modular PLC I/O modules. IC Role / Device Role / Timing Role: Isolated point-of-load regulator with external sync to avoid beat frequencies with CAN bus timing. Use Value: MODE/SYNC pin accepts 1MHz–4MHz external clock; PLL alignment eliminates switching noise coupling into analog sensor paths. |
Use Scenario: Powering low-power wireless sensor nodes (MCU + RF transceiver) requiring 1.8V/500mA with strict EMI limits. IC Role / Device Role / Timing Role: Low-ripple, low-noise buck regulator with forced continuous mode and optimized layout for Class B emissions. Use Value: Forced continuous operation eliminates subharmonic noise; 20mVP-P typical ripple meets EN 55022 conducted emission requirements. |
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 input range (3V–42V), lower IQ (2.5µA), but lower max current (3.5A) and no TRACK/SS pin. | Better suited for automotive 12V/24V systems; lacks output tracking for multi-rail sequencing. | Select if input exceeds 15V or ultra-low IQ is critical; avoid if voltage tracking or 2.5A at 3.6V VIN is required. |
| TPS54227PWPR | Lower cost, 2.5A, 4.5V–18V input, but only 0.8V ref, no Burst Mode®, and no PGOOD or TRACK. | Targeted at cost-sensitive industrial supplies where sequencing and status monitoring are handled externally. | Choose for non-battery, fixed-output applications without sequencing needs; verify thermal margin in MSOP footprint. |
Compared with LT8610EMSE#PBF and TPS54227PWPR, the LTC3604IMSE#PBF uniquely combines 3.6V–15V input compatibility, 0.6V reference, integrated tracking, Burst Mode®, and PGOOD in a thermally optimized MSOP - making it optimal for portable, multi-rail, and noise-sensitive embedded systems.
Availability
LTC3604IMSE#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, lithium-ion powered instruments, distributed power systems, industrial sensor nodes, and FPGA/CPU core supply applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LTC3604IMSE#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 maintains its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3604IMSE#PBF belongs to Linear's monolithic synchronous buck regulator family designed for high-efficiency, high-density power conversion in space-constrained and thermally demanding applications such as portable instrumentation and industrial embedded systems.
FAQ
What is the maximum junction temperature and thermal resistance of the LTC3604IMSE#PBF?
The LTC3604IMSE#PBF has a maximum junction temperature of 125°C and a thermal resistance θJA of 38°C/W in the MSOP package. This means that with 1W of power dissipation and 25°C ambient temperature, the junction reaches 63°C - well within safe operating limits. Proper PCB layout with the exposed SGND pad soldered to a thermal pad is essential to achieve this rating.
How does the LTC3604IMSE#PBF implement output voltage tracking?
The LTC3604IMSE#PBF implements output voltage tracking via the TRACK/SS pin: applying a voltage below 0.6V to this pin overrides the internal reference, causing the FB pin to servo to that voltage. An internal 1.4µA pull-up current from INTVCC enables soft-start when a capacitor is connected from TRACK/SS to ground - allowing controlled ramp-up synchronized with other supplies.
Can the LTC3604IMSE#PBF operate with a 3.3V input supply?
No - the LTC3604IMSE#PBF has a minimum input voltage of 3.6V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3.6V is not guaranteed and may result in failure to regulate or unexpected shutdown due to undervoltage lockout on INTVCC or RUN pin thresholds.
What is the purpose of the VON pin on the LTC3604IMSE#PBF?
The VON pin on the LTC3604IMSE#PBF sets the on-time comparator threshold. When connected to the regulated output, it makes the on-time proportional to VOUT - improving line regulation at high input voltages and enabling stable operation across wide VIN ranges without sacrificing transient response.
Does the LTC3604IMSE#PBF support external frequency synchronization?
Yes - the MODE/SYNC pin accepts an external clock signal from 800kHz to 4MHz. When driven, the internal PLL synchronizes the switching frequency and phase to the external source, enabling deterministic noise placement and elimination of beat frequencies in mixed-signal systems - a key advantage over free-running oscillators.
LTC3604IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3604IMSE#PBF FAQ
1.How can I place an order for LTC3604IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3604IMSE#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 LTC3604IMSE#PBF reliable?
The price and inventory of LTC3604IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3604IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3604IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3604IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3604IMSE#PBF?
LTC3604IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3604IMSE#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 LTC3604IMSE#PBF?
For technical support, including LTC3604IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3604IMSE#PBF requirements.
6.How does Aetrix verify that LTC3604IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3604IMSE#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 LTC3604IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3604IMSE#PBF?
All LTC3604IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3604IMSE#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 LTC3604IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3604IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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