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Analog Devices Inc. LTC3601EUD#TRPBF
- Part No.:
- LTC3601EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3601EUD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,210
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Product details
Overview
LTC3601EUD#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, adjustable 800kHz–4MHz switching frequency, and 96% peak efficiency. It serves as a high-density point-of-load power supply in battery-powered instrumentation and distributed power systems.
For engineers reviewing the LTC3601EUD#TRPBF datasheet, LTC3601EUD#TRPBF pinout, LTC3601EUD#TRPBF application, or LTC3601EUD#TRPBF equivalent, key selection factors include its controlled-on-time current-mode architecture, Burst Mode® operation (300µA no-load IQ), programmable soft-start, output voltage tracking, and Power Good status output - all integrated in a thermally enhanced 3mm × 3mm QFN package.
Technical Context
The LTC3601EUD#TRPBF employs a phase-lockable controlled-on-time current-mode architecture that maintains constant frequency while enabling ultra-low duty cycles (5% at 2.25MHz), making it suitable for high step-down ratio applications. Its internal PLL synchronizes top-FET on-time to either an internal oscillator (set by RT resistor) or external clock applied to MODE/SYNC pin.
It supports dual operating modes: user-selectable Burst Mode® (for light-load efficiency) or forced continuous conduction mode (for low ripple and predictable EMI). The error amplifier drives ITH to regulate valley inductor current via feedback from FB, referenced to a precise 0.6V bandgap, with ±0.6% initial accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 15V - supports wide-input industrial and Li-ion battery systems without pre-regulation. |
| Output Current | 1.5A continuous - sufficient for FPGA core rails, microcontroller SoCs, and analog signal chains. |
| Switching Frequency | 800kHz to 4MHz (resistor-programmable) - enables compact magnetics and fast transient response. |
| Peak Efficiency | 96% - minimizes thermal stress and extends battery runtime in portable instruments. |
| Quiescent Current | 300µA in Burst Mode® - preserves battery life during standby in always-on sensing nodes. |
| Reference Voltage | 0.600V ±0.6% - enables accurate low-voltage regulation (e.g., 0.8V, 1.2V, 1.8V) with standard resistor dividers. |
| Short-Circuit Protection | Foldback current limiting (ILIM ≈ 1.7–2.8A, reduced to ~0.6A during fault) - limits power dissipation and protects upstream supplies. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed PGND pad (Pin 17), θJA = 45°C/W. Requires soldering of exposed pad to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (1) | Mode control & sync input | Ground = forced continuous; float/INTVCC = Burst Mode®; external clock = PLL-synchronized operation. |
| PGOOD (2) | Open-drain status output | Pulled low when FB deviates >±8% from 0.6V; releases after return within ±5% - enables system sequencing and fault detection. |
| SW (3,4) | Switch node | Connects to inductor; swings from PGND to VIN - critical for layout low-inductance loop and EMI control. |
| BOOST (6) | Bootstrap supply | Drives high-side gate; requires ceramic capacitor between BOOST and SW - enables efficient synchronous rectification. |
| INTVCC (7) | Internal 3.3V LDO output | Supplies internal circuitry; must be decoupled with ≥1µF ceramic cap to SGND - not intended for external loads >5mA. |
| VON (8) | On-time voltage input | Sets comparator trip point; connect to VOUT ≤6V to maintain constant fSW across line/load variations. |
| SGND (9) | Signal ground reference | Low-noise return for FB, RT, ITH, TRACK - must be isolated from PGND except at single-point connection. |
| RT (10) | Oscillator programming | Resistor to SGND sets fSW (800kHz–4MHz); tie to INTVCC for default 2MHz - determines inductor size and efficiency trade-off. |
| FB (11) | Feedback input | Compares resistive divider output to 0.6V reference - defines regulated output voltage with <±0.1% load regulation. |
| ITH (12) | Error amplifier output | Controls valley current limit; connects to compensation network - determines loop stability and transient response. |
| TRACK (13) | Tracking/soft-start input | Overrides reference when <0.6V (enables sequencing); internal 1.4µA pull-up enables RC soft-start - prevents inrush current. |
| RUN (14) | Enable input | ≥1.25V enables regulation; ≤1.0V disables with 14µA shutdown current - supports power sequencing and brown-out protection. |
| VIN (15,16) | Main power input | 4V–15V supply; requires ≥10µF low-ESR ceramic bypass to PGND near pins - critical for input ripple suppression. |
| PGND (17, exposed pad) | Power ground | Return for input/output capacitors and MOSFET sources - must be low-impedance plane tied to exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Controlled-on-time current-mode architecture | Enables stable operation at very low duty cycles (e.g., 5% at 2.25MHz) without slope compensation - ideal for 12V-to-1.2V conversion. |
| User-selectable Burst Mode® or forced continuous operation | 300µA no-load IQ in Burst Mode® vs. fixed-frequency low-ripple output in forced mode - selectable per system noise/efficiency requirements. |
| Programmable soft-start via TRACK pin | RC time constant sets monotonic VOUT ramp rate - prevents inrush current and enables safe power-up of downstream logic and analog circuits. |
| Output voltage tracking capability | TRACK pin accepts external voltage ramp to coordinate startup with other rails - essential for multi-rail FPGAs and processors requiring ordered sequencing. |
| Integrated Power Good (PGOOD) output | Open-drain flag with ±8%/±5% thresholds and 40µs filter - provides reliable system-level power monitoring without external comparators. |
| VIN overvoltage lockout (17.5V trip) | Protects internal 130mΩ top / 100mΩ bottom MOSFETs from transient spikes - resumes operation automatically at 16.5V without reset. |
Applications
| Portable Medical Instrumentation | Lithium-Ion Powered Test Equipment |
|---|---|
Use Scenario: Powering ADCs, op-amps, and microcontrollers in handheld ECG or blood glucose meters with single-cell Li-ion (3.0–4.2V) input. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 1.8V/3.3V rails with low quiescent current and fast load transient response. Use Value: 300µA Burst Mode® IQ extends battery life beyond 100 hours; 96% efficiency at 1A reduces thermal load in sealed enclosures. |
Use Scenario: Supplying FPGA core (1.2V) and I/O (2.5V/3.3V) rails in portable oscilloscopes or logic analyzers powered by 2S Li-ion packs (6–8.4V). IC Role / Device Role / Timing Role: Point-of-load regulator with tracking and soft-start to coordinate rail sequencing during wake-up from deep sleep. Use Value: TRACK pin enables synchronized ramp-up of multiple outputs; 4MHz max fSW allows use of sub-1µH inductors for minimal board area. |
| Distributed Power Systems | Industrial Sensor Nodes |
Use Scenario: Local regulation from 12V backplane in modular PLC I/O modules or telecom line cards. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converting 12V to 5V/3.3V for microcontrollers and communication interfaces (RS-485, CAN). Use Value: 4V–15V input range accommodates brownout and surge conditions; short-circuit foldback protects shared 12V bus during field wiring faults. |
Use Scenario: Powering low-power wireless sensor transceivers (e.g., LoRa, NB-IoT) and precision analog front-ends in battery-operated condition monitoring nodes. IC Role / Device Role / Timing Role: Always-on buck regulator maintaining 3.3V rail with ultra-low IQ and robust start-up into pre-biased outputs. Use Value: 300µA no-load IQ enables >5-year battery life; start-up into pre-biased VOUT avoids output overshoot during wake-up events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | Fixed 1.2MHz fSW, 2A rating, no external frequency sync or TRACK pin; 3.5µA shutdown IQ. | Lacks output tracking, soft-start programmability, and external sync - unsuitable for sequenced multi-rail systems. | Select when cost-sensitive, fixed-frequency, higher-current (2A) operation suffices and sequencing is handled externally. |
| TPS54331DR | 3.5A rating, 570kHz fixed fSW, no Burst Mode®, 75µA shutdown IQ; requires external bootstrap diode. | No low-IQ light-load mode; larger MSOP-8 package; lacks PGOOD accuracy and VIN OVLO protection. | Select for higher output current and simpler BOM where 75µA shutdown suffices and EMI filtering is less critical. |
Compared with MP2315DJ-LF-Z and TPS54331DR, the LTC3601EUD#TRPBF offers superior light-load efficiency via Burst Mode®, precise rail sequencing via TRACK, and robust protection features (VIN OVLO, foldback SC protection), making it optimal for space-constrained, battery-sensitive, and multi-rail applications despite its 1.5A limit.
Availability
LTC3601EUD#TRPBF is available at Aetrix Electronics and suitable for portable medical instrumentation, lithium-ion powered test equipment, and distributed power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3601EUD#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 LTC3601EUD#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise, and space-constrained point-of-load applications in portable, industrial, and communications equipment.
FAQ
What is the maximum input voltage the LTC3601EUD#TRPBF can withstand?
The LTC3601EUD#TRPBF has an absolute maximum VIN rating of 16V, with transient tolerance up to 18V. Its built-in VIN overvoltage lockout activates at 17.5V (rising) and releases at 16.5V (falling), protecting internal MOSFETs without requiring external clamping. This ensures robust operation in automotive or industrial environments with supply transients.
Does the LTC3601EUD#TRPBF support external synchronization of its switching frequency?
Yes, the LTC3601EUD#TRPBF supports external synchronization via the MODE/SYNC pin. When driven with a clean clock signal between 800kHz and 4MHz, its internal PLL locks phase and frequency to the external source - enabling EMI reduction in noise-sensitive systems and deterministic timing in synchronized multi-converter designs.
How does Burst Mode® operation improve light-load efficiency in the LTC3601EUD#TRPBF?
Burst Mode® operation in the LTC3601EUD#TRPBF reduces no-load input current to 300µA by disabling both MOSFETs and entering sleep state when inductor current reaches zero. This eliminates switching losses and gate drive power, significantly extending battery life in standby or intermittent-use applications compared to forced continuous mode.
Can the LTC3601EUD#TRPBF safely start up into a pre-biased output?
Yes, the LTC3601EUD#TRPBF supports start-up into a pre-biased output - a critical feature for hot-swap and redundant power systems. Its controlled-on-time architecture prevents reverse current flow and output overshoot, as confirmed in Typical Performance Characteristic Figure G20 of the datasheet.
What is the purpose of the VON pin on the LTC3601EUD#TRPBF?
The VON pin on the LTC3601EUD#TRPBF sets the on-time comparator threshold. Connecting it to VOUT (≤6V) makes on-time proportional to output voltage, stabilizing switching frequency across input voltage changes - essential for consistent EMI behavior and inductor sizing in wide-input applications.
LTC3601EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN 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-QFN (3x3)
LTC3601EUD#TRPBF FAQ
1.How can I place an order for LTC3601EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3601EUD#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 LTC3601EUD#TRPBF reliable?
The price and inventory of LTC3601EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3601EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3601EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3601EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3601EUD#TRPBF?
LTC3601EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3601EUD#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 LTC3601EUD#TRPBF?
For technical support, including LTC3601EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3601EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3601EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3601EUD#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 LTC3601EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3601EUD#TRPBF?
All LTC3601EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3601EUD#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 LTC3601EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3601EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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