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Analog Devices Inc. LTC3601EMSE#TRPBF
- Part No.:
- LTC3601EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3601EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,418
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Product details
Overview
LTC3601EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator delivering up to 1.5A output current with 4V–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 and features power-good status, output tracking, and soft-start - ideal for point-of-load regulation in lithium-ion battery-powered instruments.
For engineers reviewing the LTC3601EMSE#TRPBF datasheet, LTC3601EMSE#TRPBF pinout, LTC3601EMSE#TRPBF application, or LTC3601EMSE#TRPBF equivalent, key selection criteria include its 16-pin MSOP package thermal performance (θJA = 38°C/W), valley current limit (1.7–2.8A), RDS(ON) values (130mΩ top / 100mΩ bottom), ±5% PGOOD threshold accuracy, and external frequency synchronization capability.
Technical Context
The LTC3601EMSE#TRPBF uses 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 by adjusting ITH voltage to control valley switch current, with feedback referenced to a precision 0.6V bandgap.
Switching is governed by an oscillator whose frequency is set via RT resistor (80k–400kΩ) or INTVCC tie, and synchronized externally via MODE/SYNC pin. The device integrates top/bottom MOSFETs, 3.3V INTVCC regulator, and protection features including VIN overvoltage lockout (16.5–17.5V), short-circuit foldback, and negative current limiting (–1.2A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 15V - supports wide-input industrial and battery-powered systems without pre-regulation |
| Output Current | 1.5A continuous - sufficient for FPGA core rails, DSP supplies, and microcontroller subsystems |
| Switching Frequency | 800kHz to 4MHz - enables compact magnetics and noise-sensitive layout optimization |
| Feedback Reference | 0.600V ±0.006V - allows precise low-voltage outputs (e.g., 0.9V, 1.2V, 1.8V) with standard resistor dividers |
| Quiescent Current | 300µA in Burst Mode - extends battery life in standby or intermittent-load applications |
| Efficiency | Up to 96% - minimizes thermal load in thermally constrained enclosures and portable devices |
| Thermal Resistance | θJA = 38°C/W (MSOP) - requires moderate PCB copper area for full 1.5A operation at 125°C junction |
Pinout & Package
The LTC3601EMSE#TRPBF is housed in a 16-lead plastic MSOP package (3mm × 4.9mm) with exposed pad (Pin 17) connected to SGND for thermal and signal integrity. Pin assignments are identical between QFN and MSOP variants per datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (Pin 15) | Mode control & sync input | Ground = forced continuous; float/INTVCC = Burst Mode; external clock = PLL-synchronized operation |
| PGOOD (Pin 16) | Open-drain status output | Pulled low when FB deviates >8% from 0.6V; releases after return within ±5% with 40µs filter |
| SW (Pins 1, 2) | Switch node | Connects to inductor; swings from PGND to VIN; drives both internal MOSFETs |
| VIN (Pins 13, 14) | Main power input | 4V–15V supply; requires ≥10µF low-ESR ceramic decoupling close to pins |
| RT (Pin 8) | Oscillator programming | Resistor to SGND sets fSW (800kHz–4MHz); tie to INTVCC for default 2MHz |
| FB (Pin 9) | Voltage feedback input | Compares divider output to 0.6V reference; ±30nA bias enables high-resistor ratio networks |
| ITH (Pin 10) | Error amp output & compensation | Loop compensation node; connect RC network or tie to INTVCC for internal compensation |
| TRACK (Pin 11) | Tracking/soft-start input | 0.3V–0.6V override enables sequencing; 1.4µA pull-up enables capacitor-based soft-start |
| RUN (Pin 12) | Enable input | ≥1.25V enables operation; ≤1.0V disables with <25µA shutdown current |
| BOOST (Pin 5) | Bootstrap supply | Drives top MOSFET gate; connects to CBOOST (–) terminal at SW, (+) at BOOST |
| INTVCC (Pin 6) | Internal 3.3V regulator | Supplies gate drivers and logic; requires ≥1µF ceramic to SGND |
| VON (Pin 7) | On-time voltage input | Sets comparator trip point; connect to VOUT for voltage-proportional on-time |
| SGND (Pin 17) | Signal ground | Reference for FB, RT, TRACK, ITH; must be low-noise star point separate from PGND |
| PGND (Pins 3, 4) | Power ground | Return path for input/output capacitors and bottom MOSFET; solder exposed pad for thermal path |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 300µA while maintaining regulation - critical for battery runtime in always-on sensors |
| External frequency synchronization | Enables noise-sensitive systems (e.g., RF receivers, audio ADCs) to avoid beat frequencies via MODE/SYNC pin |
| Output voltage tracking | Allows controlled ramp-up of multiple rails using single TRACK signal - simplifies multi-rail power sequencing |
| Programmable soft-start | Capacitor on TRACK pin sets startup slew rate - prevents inrush current and output overshoot |
| Short-circuit foldback protection | Limits valley current to ~0.7A during output short - reduces power dissipation and avoids thermal shutdown |
| Integrated 3.3V INTVCC regulator | Eliminates need for external bias supply - powers gate drivers and internal logic from VIN |
Applications
| Point-of-Load Regulation | Lithium-Ion Battery Instruments |
|---|---|
Use Scenario: Powering FPGA core voltage (1.0V/1.2V) from a 5V or 12V intermediate rail in compact test equipment. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise DC output with fast load transient response. Use Value: Delivers 1.5A at >92% efficiency across 0.1–1.5A load range, minimizing board heat and enabling fanless enclosure design. | Use Scenario: Supplying processor and peripheral rails in handheld medical analyzers powered by 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Main system regulator operating in Burst Mode® to extend battery life during idle periods between measurements. Use Value: Achieves 300µA quiescent current and starts up reliably down to 4V input - preserves battery capacity over weeks of standby. |
| Distributed Power Systems | Industrial Control Modules |
Use Scenario: Generating isolated 3.3V and 5V rails from a 24V backplane in modular PLC I/O cards. IC Role / Device Role / Timing Role: Non-isolated buck converter implementing local regulation with external synchronization to system clock. Use Value: External SYNC eliminates switching noise coupling into analog sensor inputs and communication interfaces. | Use Scenario: Providing 1.8V core and 3.3V I/O supplies for ARM Cortex-M7 microcontrollers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Dual-output regulator using TRACK pin to sequence core before I/O, preventing latch-up during power-up. Use Value: Integrated soft-start and power-good signaling ensure reliable boot without external supervisors or reset ICs. |
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 3.5A rating, 2.2MHz fixed frequency, lower 2.5µA quiescent current, but no TRACK pin or adjustable fSW | Better for high-current, ultra-low-IQ applications where sequencing and frequency tuning are not required | Select LT8610EMSE#TRPBF when peak current exceeds 1.5A or sub-3µA IQ is mandatory; retain LTC3601EMSE#TRPBF for design flexibility |
| TPS54331DR | 3A rating, 570kHz fixed frequency, 4.5–28V input, no Burst Mode®, higher 125µA shutdown current | Suitable for higher-input industrial supplies where efficiency at light load is secondary to cost and availability | Choose TPS54331DR for 24V input systems needing >1.5A; LTC3601EMSE#TRPBF remains preferred for battery input and precision sequencing |
Compared with LT8610EMSE#TRPBF and TPS54331DR, the LTC3601EMSE#TRPBF offers unique programmable frequency, output tracking, and dual-mode operation - making it optimal for space-constrained, multi-rail, battery-sensitive designs requiring design-in flexibility over raw current rating or lowest possible IQ.
Availability
LTC3601EMSE#TRPBF is available at Aetrix Electronics and suitable for point-of-load power supplies, lithium-ion battery instrumentation, distributed power systems, and industrial control modules requiring stable component supply and long-term production support.
Supply support for LTC3601EMSE#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 commitments.
The LTC3601EMSE#TRPBF belongs to Linear's monolithic synchronous buck regulator family designed for high-efficiency, low-noise, and feature-rich point-of-load conversion in space- and thermal-constrained applications.
FAQ
What is the maximum recommended output current for LTC3601EMSE#TRPBF in continuous operation?
The LTC3601EMSE#TRPBF is rated for 1.5A continuous output current under specified thermal conditions. At full load with 12V input and 3.3V output, proper PCB layout with ≥2 oz copper on inner layers and thermal vias under the exposed SGND pad is required to maintain junction temperature ≤125°C. Derating is necessary above ambient temperatures of 85°C or with inadequate copper area.
Does LTC3601EMSE#TRPBF support external synchronization, and what frequency range is compatible?
Yes, LTC3601EMSE#TRPBF supports external synchronization via the MODE/SYNC pin across its full programmable frequency range of 800kHz to 4MHz. An external clock signal applied to this pin engages the internal PLL, aligning the on-time of the top MOSFET to the incoming edge. The device defaults to forced continuous mode during synchronization, and no additional components are needed beyond AC-coupling if DC levels differ.
How does the TRACK pin function on LTC3601EMSE#TRPBF, and what is its voltage range for effective tracking?
The TRACK pin on LTC3601EMSE#TRPBF accepts 0.3V to 0.6V to force the FB pin to servo to that voltage, enabling output voltage sequencing or soft-start. Below 0.3V, tracking is inactive; above 0.6V, the internal 0.6V reference resumes control. An internal 1.4µA pull-up current from INTVCC allows soft-start by connecting a capacitor from TRACK to ground - time constant determines ramp rate.
What is the purpose of the VON pin on LTC3601EMSE#TRPBF, and how should it be connected?
The VON pin on LTC3601EMSE#TRPBF sets the on-time comparator threshold to make switching frequency proportional to output voltage. For VOUT ≤ 6V, connect VON directly to VOUT. For VOUT > 6V, VON must be scaled with a resistor divider to prevent excessive frequency rise. The pin has 180kΩ impedance, so divider resistors should be ≤10kΩ to avoid accuracy loss from leakage current.
Can LTC3601EMSE#TRPBF operate with input voltages below 4V, and what happens during VIN overvoltage events?
No, LTC3601EMSE#TRPBF requires minimum 4V input for guaranteed operation per Absolute Maximum Ratings and Electrical Characteristics. During VIN overvoltage, the device suspends switching when VIN exceeds 17.5V (rising) and resumes at 16.5V (falling), protecting internal MOSFETs. This OVLO circuit operates independently of RUN pin state and does not trigger soft-start upon recovery.
LTC3601EMSE#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):
- 4V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 14.52V
- Current - Output:
- 1.5A
- 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
LTC3601EMSE#TRPBF FAQ
1.How can I place an order for LTC3601EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3601EMSE#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 LTC3601EMSE#TRPBF reliable?
The price and inventory of LTC3601EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3601EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3601EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3601EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3601EMSE#TRPBF?
LTC3601EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3601EMSE#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 LTC3601EMSE#TRPBF?
For technical support, including LTC3601EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3601EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3601EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3601EMSE#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 LTC3601EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3601EMSE#TRPBF?
All LTC3601EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3601EMSE#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 LTC3601EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3601EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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