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Analog Devices Inc. LTC3601IUD#PBF
- Part No.:
- LTC3601IUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3601IUD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:357
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Product details
Overview
LTC3601IUD#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 serves as a high-density point-of-load power supply in lithium-ion battery-powered instruments and distributed power systems.
For engineers reviewing the LTC3601IUD#PBF datasheet, LTC3601IUD#PBF pinout, LTC3601IUD#PBF application, or LTC3601IUD#PBF equivalent, key selection criteria 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 LTC3601IUD#PBF employs a phase-lockable controlled on-time, current-mode architecture that maintains constant frequency while enabling very low duty cycles (5% at 2.25MHz). Its internal PLL synchronizes top-MOSFET on-time to either an internal oscillator or external clock signal applied to MODE/SYNC.
It supports dual operating modes: user-selectable Burst Mode® for ultra-low light-load quiescent current (300µA), or forced continuous mode for minimal output ripple and deterministic switching. The error amplifier drives ITH to regulate valley inductor current via a transconductance of 2.0mS, referenced to a precise 0.600V ±1% feedback threshold.
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, microcontroller SoCs, and sensor subsystems. |
| Switching Frequency | 800kHz to 4MHz (resistor-programmable) - enables compact magnetics and noise-sensitive frequency placement. |
| Peak Efficiency | 96% - minimizes thermal stress and extends battery runtime in portable applications. |
| No-Load Quiescent Current | 300µA in Burst Mode® - critical for always-on, low-power IoT endpoints and sleep-state retention. |
| Feedback Reference | 0.600V ±1% - allows precise low-output-voltage regulation (e.g., 0.9V, 1.2V, 1.8V) with standard resistor dividers. |
| Short-Circuit Protection | Foldback current limiting (ILIM reduced to ~0.7A during fault) - limits power dissipation and protects input source. |
Pinout & Package
Package: 16-pin (3mm × 3mm) plastic QFN with exposed PGND pad (Pin 17), rated for –40°C to 125°C junction temperature (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (1) | Mode control & sync input | Ground = forced continuous; float/INTVCC = Burst Mode®; external clock = synchronized forced continuous. |
| PGOOD (2) | Open-drain status output | Pulled low when FB deviates >±8% from 0.6V; releases after return within ±5% with 40µs filter. |
| SW (3,4) | Switch node | Connects to inductor; swings from PGND to VIN; drives both internal MOSFETs. |
| BOOST (6) | Bootstrap supply | Connects (+) terminal of bootstrap capacitor; supplies gate drive for top MOSFET. |
| INTVCC (7) | Internal 3.3V LDO output | Must be decoupled with ≥1µF ceramic to SGND; powers internal circuitry and gate drivers. |
| VON (8) | On-time voltage input | Sets on-time proportional to VOUT ≤6V; determines minimum achievable duty cycle. |
| SGND (9) | Signal ground reference | Low-noise return for FB divider, RT, and compensation network; separate from PGND. |
| RT (10) | Oscillator programming | Resistor to SGND sets fSW (800kHz–4MHz); tie to INTVCC for default 2MHz. |
| FB (11) | Feedback input | Compares resistive divider output to 0.600V reference; ±30nA bias enables high-resistor values. |
| ITH (12) | Error amp output & compensation | Drives loop compensation network; connect to INTVCC for internal compensation. |
| TRACK (13) | Tracking/soft-start input | Below 0.6V: forces FB to TRACK voltage; internal 1.4µA pull-up enables RC soft-start. |
| RUN (14) | Enable input | ≥1.25V enables operation; ≤1.0V disables regulator and reduces IQ to 14µA. |
| VIN (15,16) | Main power input | 4V–15V supply; requires ≥10µF low-ESR ceramic decoupling to PGND. |
| PGND (17) | Power ground | Exposed pad must be soldered to PCB plane; returns CIN, COUT, and SW current. |
Key Features
| Feature | Design Value |
|---|---|
| Controlled on-time current-mode architecture | Enables stable operation at ultra-low duty cycles (5%) and fast transient response without slope compensation. |
| Burst Mode® operation | Reduces no-load IQ to 300µA while maintaining regulation - ideal for battery life-critical applications. |
| External frequency synchronization | Accepts external clock (800kHz–4MHz) to eliminate beat frequencies in multi-rail systems. |
| Programmable soft-start via TRACK pin | RC time constant controls output ramp rate; prevents inrush current and overshoot during startup. |
| Output voltage tracking capability | Allows coordinated sequencing with other regulators by forcing FB to follow an external voltage ramp. |
| Integrated Power Good (PGOOD) output | Provides system-level power sequencing and fault detection with built-in hysteresis and glitch filtering. |
Applications
| Industrial Point-of-Load Supply | Lithium-Ion Portable Instrumentation |
|---|---|
Use Scenario: Regulating 1.2V core voltage for an ARM Cortex-M7 microcontroller in a handheld test meter. IC Role / Device Role / Timing Role: Primary buck converter providing tightly regulated, low-noise 1.2V/1.5A rail with fast load-step response. Use Value: Controlled on-time architecture delivers <10µs recovery from 100mA→1.5A load step while maintaining <1% output deviation. |
Use Scenario: Powering a precision analog front-end (AFE) and ADC in a battery-operated gas detector. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supplying 3.3V from a 2-cell Li-ion (6V–8.4V) battery pack. Use Value: Burst Mode® operation sustains 300µA quiescent current during standby, extending battery life beyond 6 months. |
| Distributed Power System Rail | Automotive Infotainment Subsystem |
Use Scenario: Generating isolated 5V auxiliary rail from a 12V vehicle bus for USB-C PD controller logic. IC Role / Device Role / Timing Role: Non-isolated buck regulator with VIN OVLO (17.5V) protecting against load-dump transients. Use Value: Integrated VIN overvoltage lockout suspends switching above 17.5V and resumes automatically below 16.5V - no external protection needed. |
Use Scenario: Supplying 1.8V to DDR memory interface in a head-unit infotainment module. IC Role / Device Role / Timing Role: Synchronous buck regulator with output voltage tracking for controlled power-up sequencing with main SoC. Use Value: TRACK pin enables monotonic 1.8V ramp aligned with SoC VDDIO, preventing latch-up during cold start. |
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; no external sync; 2A rating; no TRACK or PGOOD pins. | Lacks output tracking and precise power-good signaling - unsuitable for sequenced multi-rail systems. | Choose for cost-sensitive, single-rail applications where fixed frequency and higher current suffice. |
| TPS54332DR | Adjustable 100kHz–2.5MHz fSW; 3.5A rating; no Burst Mode®; higher 260µA IQ in eco-mode. | Higher IQ and no true ultralow-power sleep mode - less optimal for battery standby duration. | Prefer when higher output current and wider input range (3.5V–28V) outweigh light-load efficiency needs. |
Compared with MP2315DJ-LF-Z and TPS54332DR, the LTC3601IUD#PBF uniquely combines sub-1mA no-load IQ, external frequency sync, output tracking, and integrated PGOOD in a 3mm × 3mm QFN - making it the only option among the three qualified for precision, low-power, and multi-rail sequencing use cases.
Availability
LTC3601IUD#PBF is available at Aetrix Electronics and suitable for industrial point-of-load supplies, lithium-ion portable instrumentation, and automotive infotainment subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3601IUD#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 maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3601IUD#PBF belongs to Linear's high-efficiency monolithic buck regulator family, designed specifically for space-constrained, high-performance power conversion in portable, industrial, and automotive applications demanding low IQ, fast transient response, and robust protection features.
FAQ
What is the maximum input voltage the LTC3601IUD#PBF can withstand?
The LTC3601IUD#PBF has an absolute maximum VIN rating of 16V, with transient tolerance up to 18V. Its integrated VIN overvoltage lockout activates at 17.5V (rising) and releases at 16.5V (falling), protecting internal MOSFETs during load-dump events. This behavior is fully specified in the Absolute Maximum Ratings table and confirmed in the Applications Information section of the official datasheet.
Does the LTC3601IUD#PBF support external synchronization of its switching frequency?
Yes, the LTC3601IUD#PBF supports external frequency 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 to the external source. During sync, the device defaults to forced continuous mode - a behavior explicitly documented in the PIN FUNCTIONS and OPERATION sections of the datasheet.
How does the TRACK pin function on the LTC3601IUD#PBF?
The TRACK pin on the LTC3601IUD#PBF provides two functions: output voltage tracking and programmable soft-start. When a voltage below 0.6V is applied, the error amplifier servo-controls FB to match TRACK. An internal 1.4µA pull-up current from INTVCC enables soft-start by connecting an external capacitor from TRACK to ground - a method validated in Figure 14 (Output Tracking) and the APPLICATIONS INFORMATION section.
What is the guaranteed operating temperature range for the LTC3601IUD#PBF?
The LTC3601IUD#PBF is guaranteed for operation from –40°C to 125°C junction temperature. This "I" grade rating is confirmed in the ORDER INFORMATION table, where LTC3601IUD#PBF is explicitly listed with a temperature range of –40°C to 125°C. Thermal performance is characterized with θJA = 45°C/W for the 3mm × 3mm QFN package.
Can the LTC3601IUD#PBF operate with an output voltage lower than 0.6V?
No, the LTC3601IUD#PBF cannot regulate below 0.6V because its internal reference is fixed at 0.600V ±1%. The feedback network scales the output down to match this reference, so the minimum achievable VOUT depends on resistor tolerances and divider accuracy - typically limited to ~0.6V. This constraint is stated in the ELECTRICAL CHARACTERISTICS table under VFB and reinforced in the DESCRIPTION section.
LTC3601IUD#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)
LTC3601IUD#PBF FAQ
1.How can I place an order for LTC3601IUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3601IUD#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 LTC3601IUD#PBF reliable?
The price and inventory of LTC3601IUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3601IUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3601IUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3601IUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3601IUD#PBF?
LTC3601IUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3601IUD#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 LTC3601IUD#PBF?
For technical support, including LTC3601IUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3601IUD#PBF requirements.
6.How does Aetrix verify that LTC3601IUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3601IUD#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 LTC3601IUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3601IUD#PBF?
All LTC3601IUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3601IUD#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 LTC3601IUD#PBF part is unused and in its original packaging.
Return procedure for LTC3601IUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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