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Analog Devices Inc. LTC3604EMSE#PBF
- Part No.:
- LTC3604EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3604EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:278
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Product details
Overview
LTC3604EMSE#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 voltage, and programmable switching frequency from 800kHz to 4MHz in a thermally enhanced 16-lead MSOP package. It supports Burst Mode® operation for 300µA no-load IQ and features power good status, output tracking, and short-circuit protection - ideal for point-of-load regulation in battery-powered instrumentation.
For engineers reviewing the LTC3604EMSE#PBF datasheet, LTC3604EMSE#PBF pinout, LTC3604EMSE#PBF application, or LTC3604EMSE#PBF equivalent, key selection considerations include its controlled on-time current-mode architecture, 2.5A valley current limit, ±8% PGOOD threshold, 100mΩ bottom MOSFET RDS(ON), and thermal performance with θJA = 38°C/W in the MSOP package.
Technical Context
The LTC3604EMSE#PBF employs a phase-lockable controlled on-time, current-mode architecture that maintains constant frequency while enabling high step-down ratios and fast transient response. Its internal error amplifier (2.0mS transconductance) regulates output via ITH compensation, and an integrated PLL synchronizes switching to either internal oscillator (set by RT resistor) or external clock applied to MODE/SYNC.
It supports dual operating modes: Burst Mode® (300µA IQ, discontinuous conduction) for light-load efficiency, and forced continuous mode for low ripple and fixed-frequency operation. Protection includes VIN overvoltage lockout (17.5V trip), foldback short-circuit limiting (~0.87A during fault), and thermal shutdown with junction limit of 125°C.
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 - sustained DC load capability with valley current limit of 2.6A (min) and –1.7A negative limit. |
| Switching Frequency | 800kHz to 4MHz - set externally via RT resistor (80kΩ–400kΩ) or synchronized to external clock. |
| Feedback Reference | 0.600V (±1%) - enables precise low-voltage outputs (e.g., 1.2V with 1:1 resistor divider). |
| Quiescent Current | 300µA in Burst Mode® - extends battery life in standby; rises to 700µA in forced continuous mode. |
| Efficiency | Up to 95% - achieved at mid-load with optimized inductor and ceramic capacitors. |
| Thermal Resistance | θJA = 38°C/W - enabled by exposed SGND pad soldered to PCB; requires thermal land design per MSOP footprint. |
Pinout & Package
The LTC3604EMSE#PBF is housed in a 16-lead plastic MSOP package (4.9mm × 3.0mm × 1.1mm) with exposed SGND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity. Pin pitch is 0.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2) | Switch Node | Connects to inductor; swings from PGND to VIN; drives both internal MOSFETs. |
| PGOOD (Pin 16) | Open-Drain Status Output | Pulled low when FB deviates >±8% from 0.6V; releases after return within ±5% with 40µs filter. |
| MODE/SYNC (Pin 15) | Mode Control & Sync Input | Ground = forced continuous; float/INTVCC = Burst Mode®; external clock = PLL-synchronized operation. |
| FB (Pin 9) | Feedback Input | Senses resistive divider output; compared to 0.6V reference to regulate VOUT. |
| ITH (Pin 10) | Error Amplifier Output | Compensation node; connects to RC network for loop stability; tied to INTVCC for internal compensation. |
| TRACK/SS (Pin 11) | Tracking & Soft-Start Input | Voltage below 0.6V forces output tracking; internal 1.4µA pull-up enables soft-start with external capacitor. |
| RUN (Pin 12) | Enable Input | Active-high: >1.25V enables regulation; <1.0V disables with 14µA shutdown current. |
| VIN (Pins 13,14) | Main Power Input | Accepts 3.6V–15V; requires ≥10µF low-ESR ceramic decoupling to PGND. |
| PGND (Pins 3,4) | Power Ground | Return path for input/output capacitors and inductor; low-impedance connection critical for EMI and efficiency. |
| SGND (Exposed Pad) | Signal Ground | Reference for FB, ITH, RT, TRACK/SS; must be soldered to PCB thermal land for noise immunity and thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Controlled On-Time Architecture | Enables stable operation at very low duty cycles (5% @ 2.25MHz) for high input-to-output voltage ratios. |
| Burst Mode® Operation | Reduces no-load IQ to 300µA while maintaining regulation - critical for battery runtime in portable instruments. |
| External Frequency Synchronization | Accepts external clock 800kHz–4MHz on MODE/SYNC pin to eliminate beat frequencies in noise-sensitive systems. |
| Output Voltage Tracking | Supports power sequencing by forcing VOUT to follow an external ramp on TRACK/SS pin before reaching final setpoint. |
| Integrated Power Good Indicator | PGOOD open-drain output provides system-level fault detection with built-in 40µs glitch filter. |
| Robust Protection Suite | Includes VIN overvoltage lockout (17.5V), short-circuit foldback, thermal shutdown, and reverse-current blocking. |
Applications
| Point-of-Load Regulation | Lithium-Ion Battery Instruments |
|---|---|
|
Use Scenario: Local 1.8V/2.5A supply for FPGA core logic in compact test equipment powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise DC power with fast load transient response. Use Value: Delivers 2.5A at 95% efficiency with 20mVP-P ripple in Burst Mode®, extending battery life and minimizing thermal stress. |
Use Scenario: Power management for handheld medical analyzer with 3.3V microcontroller, sensors, and display backlight. IC Role / Device Role / Timing Role: Main system regulator enabling seamless transition between active and sleep states via RUN pin control. Use Value: 300µA quiescent current in Burst Mode® preserves battery charge during multi-hour idle periods without compromising wake-up speed. |
| Distributed Power Systems | Industrial Control Modules |
|
Use Scenario: Secondary 5V/2.5A rail derived from 12V backplane in modular PLC I/O chassis. IC Role / Device Role / Timing Role: Isolated point-of-load converter synchronized to system clock via MODE/SYNC pin to reduce EMI. Use Value: External clock synchronization eliminates switching noise interference with analog sensor signal chains and communication buses. |
Use Scenario: Reliable 3.3V supply for ARM Cortex-M7 MCU and CAN transceiver in factory automation controller. IC Role / Device Role / Timing Role: Regulator with PGOOD output and VIN OV protection ensures safe startup and fault reporting under harsh 24V supply conditions. Use Value: 16.8V VIN OV lockout prevents damage from field-wiring transients; PGOOD enables firmware-controlled power sequencing. |
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, 3.5A output, Silent Switcher® architecture; 2.5µA IQ in shutdown, but no Burst Mode®. | Better suited for automotive or industrial 24V systems; lacks output tracking and soft-start flexibility. | Select when input exceeds 15V or EMI is critical; avoid if low-light-load IQ or tracking is required. |
| TPS54227PWPR | 2.95V–6V input, 2.2A output, fixed 600kHz frequency; no external sync, no PGOOD, lower thermal rating (θJA = 50°C/W). | Targeted at low-voltage USB-powered devices; lacks protection features and precision tracking capability. | Consider only for cost-sensitive, low-input-voltage designs where full feature set is unnecessary. |
Compared with LT8610EMSE#PBF and TPS54227PWPR, the LTC3604EMSE#PBF uniquely balances wide 3.6V–15V input, 2.5A capability, Burst Mode® efficiency, and comprehensive protection - making it optimal for portable and distributed power applications demanding both performance and design flexibility.
Availability
LTC3604EMSE#PBF is available at Aetrix Electronics and suitable for point-of-load power supplies, lithium-ion battery-powered instruments, and distributed power systems requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for LTC3604EMSE#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 analog and power management ICs with rigorous reliability testing and automotive-grade process controls.
The LTC3604EMSE#PBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for high-efficiency, low-noise, and thermally constrained point-of-load applications in portable, industrial, and instrumentation systems.
FAQ
What is the maximum allowable input voltage for the LTC3604EMSE#PBF?
The LTC3604EMSE#PBF has an absolute maximum input voltage rating of 16V, with overvoltage lockout triggering at 17.5V (rising) and releasing at 16.5V (falling). Operation above 15V violates the recommended operating range and risks permanent damage. The device is rated for continuous operation from 3.6V to 15V, making it suitable for 12V nominal systems with transient margin.
Does the LTC3604EMSE#PBF support output voltage tracking, and how is it implemented?
Yes, the LTC3604EMSE#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 servo to that voltage, enabling precise power sequencing. An internal 1.4µA pull-up current allows soft-start functionality when an external capacitor is connected from TRACK/SS to ground - a feature confirmed in the datasheet's PIN FUNCTIONS section.
What is the thermal resistance (θJA) of the LTC3604EMSE#PBF in its MSOP package?
The LTC3604EMSE#PBF in the 16-lead MSOP package has a junction-to-ambient thermal resistance (θJA) of 38°C/W, as specified in the Absolute Maximum Ratings table. This value assumes proper PCB layout with the exposed SGND pad soldered to a thermal land. Failure to solder the exposed pad significantly degrades thermal performance and may cause premature thermal shutdown under 2.5A load.
Can the LTC3604EMSE#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3604EMSE#PBF can be synchronized to an external clock applied to the MODE/SYNC pin. The supported synchronization range matches its programmable oscillator range: 800kHz to 4MHz. When an external clock is present, the internal PLL aligns the on-time of the top MOSFET to the incoming signal, and the device defaults to forced continuous mode - a behavior explicitly documented in the PIN FUNCTIONS and OPERATION sections.
What protection features are integrated into the LTC3604EMSE#PBF?
The LTC3604EMSE#PBF integrates multiple protection features: VIN overvoltage lockout (17.5V trip), short-circuit foldback current limiting (~0.87A during fault), thermal shutdown (125°C junction limit), and reverse-current blocking. It also includes PGOOD status with ±8% fault threshold and 40µs filtering. These protections are verified in the ABSOLUTE MAXIMUM RATINGS, ELECTRICAL CHARACTERISTICS, and OPERATION sections of the datasheet.
LTC3604EMSE#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
LTC3604EMSE#PBF FAQ
1.How can I place an order for LTC3604EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3604EMSE#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 LTC3604EMSE#PBF reliable?
The price and inventory of LTC3604EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3604EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3604EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3604EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3604EMSE#PBF?
LTC3604EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3604EMSE#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 LTC3604EMSE#PBF?
For technical support, including LTC3604EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3604EMSE#PBF requirements.
6.How does Aetrix verify that LTC3604EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3604EMSE#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 LTC3604EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3604EMSE#PBF?
All LTC3604EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3604EMSE#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 LTC3604EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3604EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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