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Analog Devices Inc. LTC3601EUD#PBF
- Part No.:
- LTC3601EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3601EUD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:379
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Product details
Overview
LTC3601EUD#PBF 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 employs current-mode control with phase-lockable controlled on-time architecture for fast transient response in point-of-load power supplies for FPGA, DSP, and microprocessor core rails.
For engineers reviewing the LTC3601EUD#PBF datasheet, LTC3601EUD#PBF pinout, LTC3601EUD#PBF application, or LTC3601EUD#PBF equivalent, key selection criteria include its Burst Mode® operation (300µA no-load IQ), programmable soft-start, output voltage tracking, Power Good status output, and thermal performance in the 3mm × 3mm QFN-16 package with exposed PGND pad.
Technical Context
The LTC3601EUD#PBF uses a constant-frequency, controlled on-time current-mode architecture with internal PLL synchronization-enabling precise frequency alignment to external clocks while maintaining stable duty cycle down to 5% at 2.25MHz. Its dual-mode operation (Burst Mode® vs forced continuous) directly governs light-load efficiency versus output ripple trade-offs.
It integrates top and bottom MOSFETs with 130mΩ/100mΩ RDS(ON), supports output voltage regulation via 0.6V reference with ±1% FB accuracy, and includes comprehensive protection: VIN overvoltage lockout (16.5V–17.5V), short-circuit foldback limiting (ILIM = 1.7–2.8A), and negative valley current detection for discontinuous mode control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 15V - supports wide-input industrial and battery-powered systems including 5V, 12V rails and Li-ion stacks. |
| Output Current | 1.5A continuous - sufficient for powering low-voltage digital IC cores (e.g., 1.2V/1.8V/3.3V FPGA I/O or ARM SoC peripherals). |
| Switching Frequency | 800kHz to 4MHz - enables compact magnetics (e.g., 1µH–2.2µH inductors) and noise-sensitive high-frequency designs. |
| Efficiency | Up to 96% - achieved at mid-load with optimized layout; critical for thermally constrained embedded modules. |
| Quiescent Current | 300µA in Burst Mode® - extends battery life in always-on instrumentation and portable test equipment. |
| Reference Voltage | 0.600V ±1% - allows precise low-VOUT regulation (e.g., 0.8V via resistor divider) with minimal drift over temperature. |
| Protection Features | Short-circuit foldback, VIN OVLO (16.5V/17.5V), PGOOD with 40µs filter - ensures robust operation in unregulated or noisy supply environments. |
Pinout & Package
Package: 16-pin 3mm × 3mm plastic QFN (UD) with exposed PGND pad (Pin 17), θJA = 45°C/W. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (1) | Mode selection & sync input | Ground = forced continuous; float/INTVCC = Burst Mode®; external clock = synchronized forced continuous operation. |
| PGOOD (2) | Open-drain status output | Pulled low when FB deviates >±8% from 0.6V; releases after return within ±5% - used for system power sequencing and fault monitoring. |
| SW (3,4) | Switch node | Connects to inductor; swings from PGND to VIN - must be routed with minimal loop area to reduce EMI and switching losses. |
| BOOST (6) | Floating gate drive supply | Connects to bootstrap capacitor (+) terminal; enables high-side MOSFET drive above VIN - requires low-ESR ceramic capacitor (10nF–100nF). |
| INTVCC (7) | Internal 3.3V LDO output | Powers internal circuitry; decouple with ≥1µF ceramic cap to SGND - not intended for external loads >5mA. |
| VON (8) | On-time voltage input | Sets on-time proportional to VOUT (≤6V); enables constant-frequency operation across input/output variations. |
| SGND (9) | Signal ground reference | Low-noise analog ground for FB, RT, ITH, TRACK - separate from PGND except at single-point connection. |
| RT (10) | Oscillator frequency program | Resistor to SGND sets fSW: 80kΩ = 4MHz, 160kΩ = 2MHz, 400kΩ = 800kHz - determines inductor size and efficiency trade-off. |
| FB (11) | Feedback input | Compares resistive divider output to 0.6V reference - sets regulated VOUT; high-impedance (±30nA bias) for precision. |
| ITH (12) | Error amplifier output | Loop compensation node - connect RC network for stability; tie to INTVCC for internal compensation. |
| TRACK (13) | Tracking/soft-start input | 0.3V–0.6V override enables output voltage ramp-up or sequencing; internal 1.4µA pull-up enables capacitor-based soft-start. |
| RUN (14) | Enable input | High >1.25V enables regulation; low <1.0V disables - provides clean ON/OFF control with hysteresis. |
| VIN (15,16) | Main power input | 4V–15V supply; decouple with ≥10µF low-ESR ceramic near pins - handles high di/dt during switching. |
| PGND (17) | Power ground | Exposed pad - must be soldered to large PCB copper area for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 300µA while maintaining regulation - essential for battery runtime in standby instrumentation. |
| External frequency synchronization | Enables noise-sensitive applications (e.g., RF subsystems) to align switching harmonics outside critical bands using external clock source. |
| Programmable soft-start via TRACK pin | Capacitor-based ramp prevents inrush current and enables controlled power-up sequencing with other rails. |
| Output voltage tracking capability | Allows coordinated startup/shutdown with master supply (e.g., DDR memory VDDQ tracking VDD) using simple resistor network. |
| Integrated power MOSFETs | 130mΩ top / 100mΩ bottom RDS(ON) - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Power Good (PGOOD) with filtering | 40µs glitch rejection ensures reliable system reset assertion without false triggering during load transients. |
Applications
| Point-of-Load Regulation | Distributed Power Systems |
|---|---|
Use Scenario: Providing tightly regulated 1.2V/1.8V/3.3V rails to FPGA core logic and I/O banks on dense PCBs with limited board space. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.5A with fast load-step response and low output ripple. Use Value: Controlled on-time architecture maintains stable 2MHz switching under wide VIN/VOUT ratios, minimizing inductor size while meeting FPGA dynamic current demands. |
Use Scenario: Local DC-DC conversion in multi-rail telecom or industrial backplanes where centralized 12V or 48V bus feeds multiple isolated or non-isolated point-of-load converters. IC Role / Device Role / Timing Role: High-efficiency step-down stage converting intermediate bus voltage to sub-5V logic rails with minimal heat generation. Use Value: 96% peak efficiency and 45°C/W thermal resistance enable operation at full load without heatsinks in convection-cooled enclosures. |
| Lithium-Ion Battery-Powered Instruments | Portable Test & Measurement Equipment |
Use Scenario: Powering handheld oscilloscopes, multimeters, or data loggers powered by single-cell (3.0–4.2V) or two-cell (6.0–8.4V) Li-ion packs. IC Role / Device Role / Timing Role: Input-wide buck regulator sustaining stable 3.3V output as battery discharges from 4.2V to 3.0V. Use Value: 4V minimum VIN and Burst Mode® (300µA IQ) extend usable battery capacity by >30% compared to forced-continuous alternatives. |
Use Scenario: Supplying low-noise analog front-end (AFE) and high-speed ADC/DAC circuits in portable spectrum analyzers or signal generators. IC Role / Device Role / Timing Role: Low-ripple, synchronized power rail generator with external clock input to avoid beat frequencies with sampling clocks. Use Value: External SYNC capability allows switching frequency alignment to system clock domain, eliminating heterodyne interference in sensitive analog measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | Higher 3.5A rating, 2.2V–42V input, Silent Switcher® architecture; no TRACK pin or VON input. | Better suited for automotive or industrial inputs >15V; lacks output tracking and soft-start flexibility of LTC3601EUD#PBF. | Select LT8610EMSE#PBF only if input exceeds 15V or EMI reduction is primary concern - not drop-in compatible. |
| TPS54332DR | 3A output, 3.5V–28V input, fixed 600kHz frequency; no Burst Mode®, higher 125µA shutdown IQ but 500µA light-load IQ. | Lower cost for high-current, non-battery apps; lacks programmable frequency, PGOOD accuracy, and thermal performance of LTC3601EUD#PBF. | Choose TPS54332DR for cost-sensitive 3A designs with fixed frequency - requires redesign for tracking, soft-start, or low-IQ operation. |
Compared with LT8610EMSE#PBF and TPS54332DR, the LTC3601EUD#PBF offers superior light-load efficiency via Burst Mode®, precise output tracking, and flexible frequency programming - making it optimal for space-constrained, battery-aware, or multi-rail sequenced systems where 1.5A output suffices.
Availability
LTC3601EUD#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, distributed power systems, lithium-ion battery-powered instruments, portable test equipment, and FPGA/DSP power supply applications requiring stable component supply and long-term industrial availability.
Supply support for LTC3601EUD#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3601EUD#PBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for high-efficiency, compact, and thermally robust point-of-load conversion in space- and power-constrained embedded systems.
FAQ
What is the maximum output current capability of the LTC3601EUD#PBF?
The LTC3601EUD#PBF delivers up to 1.5A of continuous output current under typical thermal conditions (θJA = 45°C/W, TA ≤ 85°C). Peak valley switch current limit is specified from 1.7A to 2.8A, with negative current limiting at –1.2A to prevent reverse inductor current in forced continuous mode. Derating is required above 85°C ambient or with insufficient PCB copper area on the exposed PGND pad.
How does the LTC3601EUD#PBF achieve high efficiency at light loads?
The LTC3601EUD#PBF achieves high light-load efficiency through its selectable Burst Mode® operation, which reduces quiescent current to 300µA by disabling both power MOSFETs and entering a low-power sleep state until output voltage droop triggers the next switching cycle. This discontinuous conduction mode minimizes switching and gate drive losses, extending battery life in portable instrumentation without sacrificing regulation accuracy.
Can the LTC3601EUD#PBF synchronize to an external clock, and what is the supported frequency range?
Yes, the LTC3601EUD#PBF supports external synchronization via the MODE/SYNC pin across its full operating frequency range of 800kHz to 4MHz. When driven by an external clock, the internal PLL locks phase and frequency, defaulting to forced continuous operation. This feature enables EMI reduction in noise-sensitive applications such as RF receivers or high-resolution ADC systems by aligning switching harmonics away from critical frequency bands.
What is the purpose of the VON pin on the LTC3601EUD#PBF, and how is it used?
The VON pin on the LTC3601EUD#PBF sets the on-time comparator threshold to make switching period inversely proportional to output voltage - enabling constant frequency operation even with varying VOUT (up to 6V). Connecting VON directly to VOUT ensures stable regulation across input voltage changes and improves transient response. For VOUT > 6V, switching frequency may exceed the programmed value due to reduced on-time.
Does the LTC3601EUD#PBF support output voltage tracking, and how is it implemented?
Yes, the LTC3601EUD#PBF supports output voltage tracking via the TRACK pin. Applying a voltage between 0.3V and 0.6V to TRACK overrides the internal 0.6V reference, causing the regulator to servo the FB pin to that voltage - enabling precise ramp-up/ramp-down coordination with another supply. An internal 1.4µA pull-up current allows simple soft-start implementation using an external capacitor from TRACK to ground.
LTC3601EUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN 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):
- 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#PBF FAQ
1.How can I place an order for LTC3601EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3601EUD#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 LTC3601EUD#PBF reliable?
The price and inventory of LTC3601EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3601EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3601EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3601EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3601EUD#PBF?
LTC3601EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3601EUD#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 LTC3601EUD#PBF?
For technical support, including LTC3601EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3601EUD#PBF requirements.
6.How does Aetrix verify that LTC3601EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3601EUD#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 LTC3601EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3601EUD#PBF?
All LTC3601EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3601EUD#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 LTC3601EUD#PBF part is unused and in its original packaging.
Return procedure for LTC3601EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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