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Analog Devices Inc. LTC3601IUD#TRPBF
- Part No.:
- LTC3601IUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3601IUD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3601IUD#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 employs current-mode control with phase-lockable controlled on-time architecture and supports both Burst Mode® (300µA no-load IQ) and forced continuous operation for lithium-ion battery-powered instruments and point-of-load power supplies.
For engineers reviewing the LTC3601IUD#TRPBF datasheet, LTC3601IUD#TRPBF pinout, LTC3601IUD#TRPBF application, or LTC3601IUD#TRPBF equivalent, this page delivers verified technical context, package-validated pin functions, real-world application constraints (e.g., 0.6V reference, ±8% PGOOD threshold, 20ns min on-time), and two confirmed alternative regulators with documented functional trade-offs.
Technical Context
The LTC3601IUD#TRPBF uses a constant-frequency, controlled on-time current-mode architecture with internal PLL synchronization-enabling precise frequency alignment to external clocks while maintaining fast transient response. Its top/bottom MOSFETs feature 130mΩ/100mΩ RDS(ON), supporting high step-down ratios at 2.25MHz with 5% minimum duty cycle.
It integrates a 3.3V INTVCC regulator (±0.6% load regulation), programmable soft-start (400–700µs), output voltage tracking, and foldback short-circuit protection that reduces valley current limit to ~0.7A during fault conditions. The device operates across –40°C to 125°C junction temperature with thermal shutdown and VIN overvoltage lockout (16.5V–17.5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 15V - supports wide-input industrial and battery systems without pre-regulation |
| Output Current | 1.5A continuous - sufficient for FPGA core rails and microcontroller SoCs |
| Switching Frequency | 800kHz to 4MHz - enables compact 1–2.2µH inductors and low-profile ceramic capacitors |
| Peak Efficiency | 96% at 1.5A - minimizes thermal stress in sealed enclosures and portable devices |
| Quiescent Current | 300µA in Burst Mode - extends runtime in always-on sensor nodes and IoT endpoints |
| Reference Voltage | 0.600V ±6mV - allows precise 0.8V–5V output setting with standard resistor dividers |
| Power Good Threshold | ±8% FB window (good-to-bad), ±5% (bad-to-good) - provides robust output monitoring with 40µs glitch filtering |
Pinout & Package
Package: 16-pin (3mm × 3mm) QFN with exposed PGND pad (Pin 17), thermally enhanced for ≤45°C/W θJA. Requires soldering of exposed pad to PCB ground plane for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (1) | Mode selection & 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; high-impedance when within ±5% - enables system power sequencing |
| SW (3,4) | Switch node | Connects to inductor; swings from PGND to VIN - requires low-inductance layout to minimize EMI |
| BOOST (6) | Floating gate drive supply | Connects to bootstrap capacitor (+) terminal; enables high-side MOSFET drive above VIN |
| INTVCC (7) | Internal 3.3V regulator output | Must be decoupled with ≥1µF ceramic cap to SGND - powers internal circuitry and bias networks |
| VON (8) | On-time voltage input | Connected to VOUT to make on-time proportional to output voltage - stabilizes frequency under varying loads |
| SGND (9) | Signal ground reference | Low-noise return for FB divider, RT resistor, and compensation network - separate from PGND |
| RT (10) | Oscillator frequency programming | Resistor to SGND sets fSW: 160kΩ = 1.4MHz; 80kΩ = 2MHz; 400kΩ = 800kHz |
| FB (11) | Feedback input | Compares resistive divider output to 0.6V reference - determines regulated output voltage |
| 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 | Below 0.6V overrides reference for voltage ramp-up; 1.4µA internal pull-up enables capacitor-based soft-start |
| RUN (14) | Enable input | ≥1.25V enables operation; ≤1.0V forces shutdown - must not be left floating |
| VIN (15,16) | Main power input | 4V–15V supply - requires ≥10µF low-ESR ceramic input capacitance close to pins |
| PGND (17) | Power ground | Exposed pad - must be soldered to PCB ground plane for low-impedance return and thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 300µA while maintaining regulation - critical for battery life in standby mode |
| External frequency synchronization | Accepts 800kHz–4MHz clock on MODE/SYNC pin with PLL alignment - eliminates beat frequencies in multi-rail systems |
| Programmable soft-start | 400–700µs internal ramp via TRACK pin capacitor - prevents inrush current and output overshoot |
| Output voltage tracking | TRACK pin accepts external voltage <0.6V to servo FB - enables coordinated power-up with other rails |
| Short-circuit foldback protection | Reduces valley current limit from 2.2A to ~0.7A during output short - limits power dissipation and input current surge |
| 0.6V precision reference | ±6mV tolerance over –40°C to 125°C - enables accurate low-voltage outputs (e.g., 0.8V, 1.0V, 1.2V) with minimal resistor error |
Applications
| Distributed Power Systems | Lithium-Ion Battery-Powered Instruments |
|---|---|
Use Scenario: Point-of-load conversion in multi-rail telecom or industrial backplanes where space and thermal density are constrained. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.5A at 1.8V or 3.3V from 12V intermediate bus. Use Value: 96% efficiency and 2.25MHz operation enable use of 2.2µH inductors and 22µF ceramic output caps - reducing board area by >40% vs lower-frequency alternatives. |
Use Scenario: Core power supply for handheld test equipment with Li-ion battery input (3.2V–4.2V nominal, up to 15V with charger path). IC Role / Device Role / Timing Role: Main system regulator supplying processor, ADC, and display driver from variable battery voltage. Use Value: 300µA Burst Mode IQ extends battery runtime in sleep mode; 4V–15V input range avoids need for additional boost stage during battery discharge. |
| Point-of-Load Power Supply | Industrial Embedded Controllers |
Use Scenario: Local regulation for FPGA I/O banks or ASIC auxiliary rails requiring tight voltage accuracy and fast transient response. IC Role / Device Role / Timing Role: Synchronous buck converter with programmable soft-start and output tracking for rail sequencing. Use Value: 0.6V reference and ±5% PGOOD window ensure reliable logic-level compliance; TRACK pin enables synchronized ramp with core rail. |
Use Scenario: Power management in DIN-rail mounted PLC modules operating in harsh ambient temperatures (–40°C to +85°C). IC Role / Device Role / Timing Role: Robust 1.5A DC/DC regulator with VIN OVLO (16.5V–17.5V) and thermal shutdown for unregulated 24VDC field inputs. Use Value: Guaranteed –40°C to 125°C operation and 45°C/W θJA allow full 1.5A output without derating in convection-cooled enclosures. |
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 output, 2.2MHz fixed frequency, lower 2.5µA quiescent current in Silent Switcher mode | Superior EMI performance and higher current capacity; lacks TRACK pin and external frequency programming | Select for noise-sensitive analog systems or higher-current needs; avoid if output tracking or custom fSW is required |
| TPS54332DR | 3A output, 57µA IQ, 100kHz–2.5MHz adjustable frequency, no Burst Mode, integrated compensation | Lower cost, simpler layout; lacks PGOOD, soft-start programmability, and thermal-enhanced QFN | Select for cost-driven industrial designs with stable input and moderate transient requirements; avoid for battery-powered or precision sequencing apps |
Compared with LT8610EMSE#PBF and TPS54332DR, the LTC3601IUD#TRPBF uniquely balances 1.5A capability, 300µA Burst Mode IQ, TRACK-enabled sequencing, and 800kHz–4MHz programmability - making it optimal for space-constrained, battery-aware, and multi-rail embedded systems where flexibility and low-light-load efficiency are prioritized over raw current or ultra-low EMI.
Availability
LTC3601IUD#TRPBF is available at Aetrix Electronics and suitable for distributed power systems, lithium-ion battery-powered instruments, and point-of-load power supplies requiring stable component supply, guaranteed long-term availability, and traceable sourcing for industrial and medical OEM programs.
Supply support for LTC3601IUD#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 automotive and industrial qualification standards.
The LTC3601IUD#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise, and thermally constrained point-of-load applications in portable, industrial, and communications equipment.
FAQ
What is the maximum allowable input voltage for the LTC3601IUD#TRPBF?
The LTC3601IUD#TRPBF has an absolute maximum VIN rating of 16V, with overvoltage lockout engaging at 16.5V (falling) and 17.5V (rising). Operation above 15V violates the recommended operating range and risks permanent damage. Transient spikes beyond 18V are strictly prohibited per Absolute Maximum Ratings.
Does the LTC3601IUD#TRPBF support output voltage tracking, and how is it implemented?
Yes, the LTC3601IUD#TRPBF supports output voltage tracking via the TRACK pin (Pin 13). Applying a voltage below 0.6V to TRACK overrides the internal reference and forces the FB pin to follow that voltage. An internal 1.4µA pull-up current from INTVCC enables soft-start when a capacitor is connected between TRACK and ground - a key feature for coordinated power-up in multi-rail systems.
What is the minimum on-time specification for the LTC3601IUD#TRPBF, and why does it matter?
The LTC3601IUD#TRPBF has a minimum on-time of 20ns (typical) at VON = 1V and VIN = 4V. This enables stable operation at very low duty cycles - critical for high input-to-output voltage step-down (e.g., 12V → 1.2V at 2.25MHz yields 5% duty cycle). Violating min on-time causes pulse-skipping and output ripple increase.
How does Burst Mode® operation affect light-load efficiency in the LTC3601IUD#TRPBF?
In Burst Mode®, the LTC3601IUD#TRPBF reduces no-load input current to 300µA (typical) by disabling switching and entering sleep state until output droop triggers a new cycle. This improves light-load efficiency by >30 percentage points versus forced continuous mode at 1mA load - essential for battery longevity in always-on sensor nodes.
Can the LTC3601IUD#TRPBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3601IUD#TRPBF accepts external synchronization on the MODE/SYNC pin across 800kHz–4MHz. An internal PLL locks the on-time of the top MOSFET to the external clock edge, ensuring phase alignment and eliminating beat frequencies - vital for noise-sensitive data acquisition and RF subsystems.
LTC3601IUD#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)
LTC3601IUD#TRPBF FAQ
1.How can I place an order for LTC3601IUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3601IUD#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 LTC3601IUD#TRPBF reliable?
The price and inventory of LTC3601IUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3601IUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3601IUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3601IUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3601IUD#TRPBF?
LTC3601IUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3601IUD#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 LTC3601IUD#TRPBF?
For technical support, including LTC3601IUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3601IUD#TRPBF requirements.
6.How does Aetrix verify that LTC3601IUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3601IUD#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 LTC3601IUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3601IUD#TRPBF?
All LTC3601IUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3601IUD#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 LTC3601IUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3601IUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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