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Analog Devices Inc. LTC3604EMSE#TRPBF
- Part No.:
- LTC3604EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3604EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,262
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Product details
Overview
LTC3604EMSE#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 voltage, and programmable switching frequency from 800kHz to 4MHz. It operates in Burst Mode® (300µA no-load IQ) or forced continuous mode, features power good status, output tracking, and short-circuit protection - deployed in point-of-load power supplies for FPGA and microprocessor core rails.
For engineers reviewing the LTC3604EMSE#TRPBF datasheet, LTC3604EMSE#TRPBF pinout, LTC3604EMSE#TRPBF application, or LTC3604EMSE#TRPBF equivalent, key selection criteria include its 16-pin MSOP package thermal performance (θJA = 38°C/W), valley current limit of 2.6A–4.3A, ±8% PGOOD threshold accuracy, and controlled-on-time current-mode architecture enabling fast transient response in high-step-down-ratio designs.
Technical Context
The LTC3604EMSE#TRPBF employs a phase-lockable controlled-on-time current-mode architecture with internal PLL synchronization, aligning top MOSFET on-time to internal or external clock edges. This enables stable constant-frequency operation even at very low duty cycles (5% at 2.25MHz), supporting high input-to-output voltage ratios without subharmonic instability.
It integrates dual N-channel MOSFETs (130mΩ top / 100mΩ bottom), a 3.3V INTVCC LDO, and precision error amplifier (2.0mS transconductance). Mode control via MODE/SYNC pin selects between Burst Mode® (discontinuous conduction, 300µA IQ) and forced continuous operation (low ripple, fixed frequency), while TRACK/SS enables output voltage sequencing and soft-start via 1.4µA internal pull-up current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 15V - supports wide-input industrial and battery-powered systems including 12V rail and Li-ion stacks. |
| Output Current | 2.5A continuous - sufficient for powering FPGA I/O banks, ARM SoC cores, or ASIC logic domains. |
| Switching Frequency | 800kHz to 4MHz (resistor-programmable) - enables compact magnetics; RT=160kΩ yields 2MHz nominal. |
| Efficiency | Up to 95% - achieved at mid-load with optimized inductor and ceramic output capacitors. |
| No-Load Quiescent Current | 300µA in Burst Mode® - extends battery life in always-on instrumentation and sensor nodes. |
| Reference Voltage | 0.600V ±0.006V - enables precise low-voltage regulation (e.g., 0.8V, 1.0V, 1.2V) with standard resistor dividers. |
| Power Good Threshold | ±8% FB window (good-to-bad), ±5% (bad-to-good) - provides robust output monitoring with 40µs glitch filter. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), exposed pad (Pin 17) connected to SGND, θJA = 38°C/W. Thermal pad must be soldered to PCB for reliable power dissipation and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (15) | Mode control & sync input | Ground = forced continuous; float or INTVCC = Burst Mode®; external clock = PLL-synchronized forced continuous. |
| PGOOD (16) | Open-drain status output | Pulled low when FB deviates >±8% from 0.6V; high-impedance when within ±5%; 40µs internal filter prevents false triggers. |
| SW (1,2) | Switch node | Connects to inductor; swings from PGND to VIN; drives both internal MOSFETs; requires low-inductance layout. |
| BOOST (5) | Floating gate drive supply | Connects (+) terminal of bootstrap capacitor; referenced to SW; enables high-side N-MOSFET drive above VIN. |
| INTVCC (6) | Internal 3.3V LDO output | Must be decoupled with ≥1µF ceramic cap to SGND; powers internal circuitry; max 5mA load per spec. |
| VON (7) | On-time voltage input | Connected to VOUT to make on-time proportional to output voltage - critical for stable operation across input/output ratios. |
| SGND (17) | Signal ground reference | Low-noise return for FB divider, RT, compensation network; exposed pad must be soldered to PCB ground plane. |
| RT (8) | Oscillator frequency set | Resistor to SGND programs fSW: R = 3.2×10¹¹/fHz (e.g., 160kΩ → ~2MHz); tie to INTVCC for default 2MHz. |
| FB (9) | Feedback input | Compares resistive divider output to 0.6V reference; ±30nA input bias enables high-value dividers for low power loss. |
| ITH (10) | Error amp output & compensation | Loop compensation node; connect RC network for stability; tie to INTVCC for internal compensation. |
| TRACK/SS (11) | Tracking & soft-start control | Below 0.6V: forces FB to TRACK voltage; above 0.6V: reverts to internal reference; 1.4µA pull-up enables RC soft-start. |
| RUN (12) | Enable input | ≥1.25V (typ) enables operation; ≤1.0V (typ) shuts down; 1.5µA leakage ensures defined state if not driven. |
| VIN (13,14) | Main power input | Accepts 3.6V–15V; requires ≥10µF low-ESR ceramic input cap tied directly to PGND pins (3,4). |
| PGND (3,4) | Power ground return | Low-impedance return for CIN, COUT, and internal FETs; connects to exposed pad in QFN but to Pins 3/4 in MSOP. |
Key Features
| Feature | Design Value |
|---|---|
| Controlled-on-time current-mode architecture | Enables stable operation at ultra-low duty cycles (5%) and high frequencies without slope compensation. |
| Programmable switching frequency (800kHz–4MHz) | Allows optimization of inductor size vs. efficiency; supports EMI-sensitive applications via external sync. |
| Burst Mode® operation | Reduces no-load IQ to 300µA while maintaining regulated output - critical for battery longevity in portable instruments. |
| Output voltage tracking & soft-start | Ensures safe power sequencing across multiple rails using single external capacitor on TRACK/SS pin. |
| Integrated power MOSFETs (130mΩ/100mΩ) | Eliminates external high-side driver and discrete FETs; reduces BOM count and layout complexity. |
| Short-circuit foldback protection | Limits valley current to ~1.3A during output short, reducing thermal stress and protecting upstream supply. |
Applications
| Point-of-Load Power Supply | Lithium-Ion Battery-Powered Instrument |
|---|---|
Use Scenario: Regulating 1.2V core voltage for an ARM Cortex-A72 processor in a handheld test analyzer powered by 2-cell Li-ion (6–8.4V). IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise core power with fast load transient response. Use Value: Controlled-on-time architecture maintains stability at 1.2V/2.5A with 8V input (15% duty cycle), while Burst Mode® extends runtime during standby. |
Use Scenario: Powering a portable gas chromatograph's analog front-end and microcontroller from a single 3.7V Li-ion cell with tight ripple requirements. IC Role / Device Role / Timing Role: Step-down regulator generating 3.3V from declining battery voltage (4.2V → 3.0V), maintaining regulation through full discharge. Use Value: 0.6V reference and adjustable frequency allow use of small 1µH inductor; 300µA IQ minimizes quiescent drain during sensor sleep cycles. |
| Distributed Power System | Industrial Sensor Node |
Use Scenario: Local 5V-to-3.3V conversion on a modular PLC backplane where upstream 5V rail exhibits ±10% variation. IC Role / Device Role / Timing Role: Secondary buck stage ensuring stable 3.3V for digital I/O isolators and CAN transceivers despite input rail noise. Use Value: ±0.1% load regulation and ±0.01%/V line regulation maintain <10mV output deviation across full load and input range. |
Use Scenario: Providing 1.8V to a low-power IoT sensor SoC in a sealed enclosure with ambient temperature ranging –40°C to +85°C. IC Role / Device Role / Timing Role: High-efficiency regulator operating in forced continuous mode to avoid audible switching noise in quiet environments. Use Value: Guaranteed –40°C to 125°C junction operation, 95% peak efficiency at 1A, and integrated thermal shutdown prevent field failures. |
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#TRPBF | Higher 42V max input, 3.5A output, Silent Switcher® architecture; 2.5µA IQ in Burst Mode®; requires different compensation. | Better suited for automotive (42V transients) and ultra-low-noise applications; larger solution size due to integrated ferrite shield. | Select LT8610EMSE#TRPBF only if input exceeds 15V or EMI compliance is critical; not drop-in compatible. |
| TPS54227PWPR | TI part: 17V max input, 2.5A, 500kHz–2.2MHz, 1.2V ref, no TRACK/SS, lower 125µA IQ in Eco-mode. | Lacks output tracking and soft-start control; simpler loop compensation; lower cost but less flexible sequencing capability. | Choose TPS54227PWPR for cost-sensitive, non-sequenced 3.3V/5V rails where tracking is unnecessary. |
Compared with LT8610EMSE#TRPBF and TPS54227PWPR, the LTC3604EMSE#TRPBF offers superior light-load efficiency control via selectable Burst Mode®, integrated tracking for multi-rail sequencing, and tighter reference voltage tolerance (±1%), making it optimal for precision, battery-constrained, or thermally sensitive point-of-load designs.
Availability
LTC3604EMSE#TRPBF 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, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC3604EMSE#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 high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3604EMSE#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, high-transient-response point-of-load conversion in space-constrained and thermally demanding applications.
FAQ
What is the maximum allowable input voltage for the LTC3604EMSE#TRPBF?
The LTC3604EMSE#TRPBF has an absolute maximum VIN 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.
Does the LTC3604EMSE#TRPBF support external frequency synchronization?
Yes, the LTC3604EMSE#TRPBF supports external synchronization via the MODE/SYNC pin. When driven with a clean CMOS clock signal between 800kHz and 4MHz, its internal PLL locks phase and frequency - defaulting to forced continuous mode during sync. No additional components are required beyond the clock source.
How does the TRACK/SS pin function on the LTC3604EMSE#TRPBF?
The TRACK/SS pin on the LTC3604EMSE#TRPBF serves dual roles: below 0.6V, it overrides the internal reference to force FB tracking; above 0.6V, control reverts to the 0.6V reference. Its 1.4µA internal pull-up current enables soft-start by connecting an external capacitor to ground - the LTC3604EMSE#TRPBF ramps output in proportion to that capacitor's voltage.
What thermal considerations apply to the LTC3604EMSE#TRPBF in MSOP package?
The LTC3604EMSE#TRPBF in 16-lead MSOP has θJA = 38°C/W. Its exposed SGND pad (Pin 17) must be soldered to a minimum 100mm² copper area for effective heat transfer. Junction temperature must remain ≤125°C; derating is required above 85°C ambient under full 2.5A load unless enhanced PCB cooling is implemented.
Can the LTC3604EMSE#TRPBF operate with zero output load?
Yes, the LTC3604EMSE#TRPBF operates reliably at zero load in Burst Mode® (MODE/SYNC floating or tied to INTVCC), drawing only 300µA typical input current. In forced continuous mode, it maintains switching regardless of load but draws higher quiescent current (~700µA), making Burst Mode® essential for ultra-low-power standby states.
LTC3604EMSE#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
LTC3604EMSE#TRPBF FAQ
1.How can I place an order for LTC3604EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3604EMSE#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 LTC3604EMSE#TRPBF reliable?
The price and inventory of LTC3604EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3604EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3604EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3604EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3604EMSE#TRPBF?
LTC3604EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3604EMSE#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 LTC3604EMSE#TRPBF?
For technical support, including LTC3604EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3604EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3604EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3604EMSE#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 LTC3604EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3604EMSE#TRPBF?
All LTC3604EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3604EMSE#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 LTC3604EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3604EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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