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Analog Devices Inc. LTC3605EUF#TRPBF
- Part No.:
- LTC3605EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3605EUF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 5A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,296
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Product details
Overview
LTC3605EUF#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator delivering up to 5A output current with programmable switching frequency from 800kHz to 4MHz, integrated 70mΩ top and 35mΩ bottom N-channel MOSFETs, and 4V–15V input voltage range - designed for high-efficiency point-of-load power in portable instruments and distributed power systems.
For engineers reviewing the LTC3605EUF#TRPBF datasheet, LTC3605EUF#TRPBF pinout, LTC3605EUF#TRPBF application, or LTC3605EUF#TRPBF equivalent, key selection considerations include its constant-frequency current-mode architecture, PolyPhase® capability for multi-phase scaling, 0.6V ±1% reference accuracy, internal 3.3V INTVCC regulator, and phase-selectable CLKOUT for synchronized multi-regulator designs.
Technical Context
The LTC3605EUF#TRPBF implements a controlled-on-time, constant-frequency current-mode control architecture with dual internal phase-locked loops: one synchronizing the oscillator to an external CLKIN (±30% lock range), and another servoing the on-time to maintain fixed frequency under varying load or input conditions. It supports discontinuous conduction mode (DCM) via MODE pin control and includes foldback current limiting during short-circuit events.
Its integrated power stage uses internal N-channel MOSFETs with RDS(ON) of 70mΩ (top) and 35mΩ (bottom) at INTVCC = 3.3V, enabling high efficiency up to 96% at 1MHz. The device features output tracking/soft-start via TRACK/SS, precision PGOOD monitoring with ±10% window and 52-cycle blanking, and VIN overvoltage protection that suspends operation above 17V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 15V - supports dual Li-ion battery inputs and 5V/12V rail point-of-load applications. |
| Output Current | 5A continuous - sufficient for FPGA core rails, DSP processors, and high-performance analog subsystems. |
| Switching Frequency | 800kHz to 4MHz (programmable via RT resistor or external CLKIN) - enables compact magnetics and low-profile inductor selection. |
| Reference Voltage | 0.6V ±1% (–40°C to 85°C) - ensures tight output regulation across temperature for precision loads. |
| Efficiency | Up to 96% at 1MHz, VIN = 12V, VOUT = 3.3V - minimizes thermal stress and extends battery life in portable equipment. |
| Shutdown Current | <15µA - preserves battery charge during system sleep or standby modes. |
| Package | 24-pin (4mm × 4mm) QFN with exposed PGND pad - provides low thermal resistance (θJA = 37°C/W) and robust PCB heat dissipation. |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 25), rated for –40°C to 85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator frequency programming | Resistor-to-SGND sets switching frequency; determines minimum off-time and duty cycle limits. |
| PHMODE (Pin 2) | Phase selector input | Configures CLKOUT phase offset (180°/120°/90°) for 2-/3-/4-phase PolyPhase® operation. |
| MODE (Pin 3) | Operation mode control | Tie to INTVCC for forced CCM; tie to SGND for DCM at light loads - affects light-load efficiency. |
| FB (Pin 4) | Feedback voltage sensing | Compares resistive divider output to 0.6V reference; primary loop control node for regulation. |
| TRACK/SS (Pin 5) | Tracking and soft-start control | Internal 2µA pull-up enables capacitor-based soft-start; external voltage enables output tracking. |
| ITH (Pin 6) | Error amplifier output & compensation | Sets valley current threshold; internal compensation (tie to INTVCC) simplifies design but trades transient response. |
| RUN (Pin 7) | Enable/disable control | Logic-high (>1.2V) enables regulation; <1.1V forces shutdown with <15µA quiescent current. |
| PGOOD (Pin 8) | Power-good status indicator | Open-drain output pulled low if FB exits ±10% window; includes 52-cycle glitch blanking. |
| VON (Pin 9) | On-time voltage input | Adjusts on-time proportionally to VOUT; maintains constant frequency across output voltages when tied to VOUT. |
| PGND (Pins 10, 25) | Power ground return | Return path for internal MOSFETs; exposed pad must be soldered to PCB ground for thermal and electrical performance. |
| SW (Pins 11–16) | Switch node connection | Drives external inductor; swings from ~–0.3V to PVIN - requires low-inductance layout and Kelvin routing. |
| PVIN (Pins 17, 18) | Main power input | Supplies internal power MOSFETs; accepts 4V–15V; must be decoupled with low-ESR ceramic capacitors. |
| SVIN (Pin 19) | Filtered signal input | Provides clean bias to internal 3.3V LDO; connected to PVIN via RC filter (1Ω–10Ω + 0.1µF). |
| BOOST (Pin 20) | Top MOSFET gate drive supply | Bootstrap node for high-side driver; swings from ~INTVCC–0.3V to PVIN+INTVCC - requires 10nF–100nF ceramic bootstrap cap. |
| INTVCC (Pin 21) | Internal 3.3V regulator output | Powers gate drivers and control logic; must be bypassed with ≥1µF low-ESR ceramic to PGND. |
| SGND (Pin 22) | Signal ground reference | Reference for analog circuitry (FB, ITH, TRACK/SS); separate from PGND to minimize noise coupling. |
| CLKOUT (Pin 23) | Phase-locked clock output | Drives CLKIN of downstream LTC3605 for synchronized multi-phase operation; amplitude = INTVCC to GND. |
| CLKIN (Pin 24) | External synchronization input | Accepts external clock (800kHz–4MHz); internal 20kΩ pull-down enables single-wire daisy-chaining. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® operation support | Enables up to 12-phase interleaving using CLKIN/CLKOUT chaining and PHMODE-configurable phase offsets - reduces input/output ripple and EMI. |
| Integrated power MOSFETs | 70mΩ top / 35mΩ bottom N-channel devices eliminate external FETs and drivers - simplifies BOM and layout while maintaining >95% efficiency at 5A. |
| Output voltage tracking & soft-start | TRACK/SS pin supports precise sequencing with external voltage sources or capacitor-based ramp control - prevents inrush current and enables safe power-up of multi-rail systems. |
| Constant-frequency current-mode control | Combines fast transient response (via current sensing) with stable, predictable switching frequency - avoids subharmonic oscillation and eases EMI filtering. |
| VIN overvoltage protection | Automatically disables switching if PVIN exceeds 17V - protects internal MOSFETs from transient spikes without external components. |
Applications
| Battery-Powered Portable Instruments | Point-of-Load Power for FPGA/DSP Cores |
|---|---|
Use Scenario: Handheld test equipment requiring stable 1.2V/3.3V rails from dual-cell Li-ion (6V–8.4V) with minimal heat generation and long runtime. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5A output with adaptive DCM/CCM mode switching to optimize efficiency across load range. Use Value: 96% peak efficiency and <15µA shutdown current extend battery life; compact 4mm × 4mm QFN fits space-constrained enclosures. | Use Scenario: FPGA core voltage rail (1.0V–1.2V @ 4A) in industrial embedded controller with strict sequencing and low-noise requirements. IC Role / Device Role / Timing Role: High-precision, low-noise synchronous buck converter with 0.6V ±1% reference and PGOOD monitoring for system-level power validation. Use Value: Tight reference accuracy and ±10% PGOOD window ensure reliable FPGA configuration and operation; TRACK/SS enables controlled power-up sequence. |
| Distributed Power Systems | Multi-Phase High-Current Supplies |
Use Scenario: Rack-mounted telecom module needing isolated 3.3V/5V rails from 12V backplane with low EMI and high reliability. IC Role / Device Role / Timing Role: Point-of-load regulator with external CLKIN synchronization to system clock - eliminates beat frequencies and simplifies EMI compliance. Use Value: 800kHz–4MHz programmability allows EMI band avoidance; PolyPhase® support enables parallel operation without external timing ICs. | Use Scenario: High-current ASIC supply (12A total) using four LTC3605EUF#TRPBF in 4-phase configuration with 90° phase shift. IC Role / Device Role / Timing Role: One phase of a synchronized multi-regulator array, driven by upstream CLKOUT and configured via PHMODE for precise interleaving. Use Value: Interleaved phases reduce input/output capacitor RMS current by ~50%, cut peak ripple amplitude, and lower thermal stress per device. |
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 frequency, 3A rating, no external frequency programming or PolyPhase® support, smaller 8-pin SOIC package. | Suitable for cost-sensitive, lower-current applications where multi-phase scaling and frequency flexibility are unnecessary. | Select MP2315DJ-LF-Z only when 3A output suffices and board space is constrained - lacks LTC3605EUF#TRPBF's precision reference, tracking, and phase-control features. |
| TPS54560QDGQRQ1 | Wider 3.5V–60V input range, 5A output, adjustable frequency (100kHz–2.5MHz), no integrated tracking/soft-start pin or PolyPhase® capability. | Preferred for automotive 12V/24V systems with high-voltage transients, but requires external soft-start circuitry and lacks multi-phase clocking. | Choose TPS54560QDGQRQ1 for harsh-environment automotive use - not drop-in compatible due to different pinout, control architecture, and missing PHMODE/CLKOUT functionality. |
Compared with MP2315DJ-LF-Z and TPS54560QDGQRQ1, the LTC3605EUF#TRPBF uniquely combines 5A capability, 0.6V ±1% reference, integrated PolyPhase® clocking, and TRACK/SS-based sequencing - making it optimal for high-density, multi-rail, and thermally sensitive portable or telecom power designs.
Availability
LTC3605EUF#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable instruments, FPGA/DSP point-of-load supplies, and distributed telecom power systems requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for LTC3605EUF#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3605EUF#TRPBF belongs to Linear's high-efficiency monolithic buck regulator product line, engineered specifically for demanding point-of-load applications requiring precision regulation, fast transient response, and scalable multi-phase operation in space- and thermal-constrained environments.
FAQ
What is the maximum output current supported by the LTC3605EUF#TRPBF?
The LTC3605EUF#TRPBF delivers up to 5A continuous output current under typical thermal conditions (TA ≤ 85°C, proper PCB layout with exposed pad soldered). Its integrated 70mΩ top and 35mΩ bottom N-channel MOSFETs enable this rating without external power switches. Derating applies at elevated ambient temperatures or with insufficient copper area.
Does the LTC3605EUF#TRPBF support external frequency synchronization?
Yes, the LTC3605EUF#TRPBF supports external synchronization via its CLKIN pin (Pin 24), accepting clock signals from 800kHz to 4MHz. Its internal PLL locks to the external clock within ±30% of the RT-programmed frequency, ensuring stable phase-aligned operation in multi-regulator systems.
How does the TRACK/SS pin function on the LTC3605EUF#TRPBF?
The TRACK/SS pin (Pin 5) provides dual functionality: applying an external voltage (0V–0.6V) enables output voltage tracking relative to another rail; connecting a capacitor enables soft-start by controlling the output voltage ramp rate. An internal 2µA pull-up current to INTVCC establishes the default soft-start behavior.
What is the purpose of the PHMODE pin on the LTC3605EUF#TRPBF?
The PHMODE pin (Pin 2) configures the phase relationship between CLKIN and CLKOUT for PolyPhase® operation: tying to INTVCC yields 180° (2-phase), to SGND yields 120° (3-phase), and to INTVCC/2 yields 90° (4-phase). This enables precise interleaving across multiple LTC3605EUF#TRPBF regulators without external timing components.
Can the LTC3605EUF#TRPBF operate with a 3.3V input voltage?
No - the LTC3605EUF#TRPBF has a minimum input voltage of 4V per its absolute maximum ratings and electrical characteristics table. Operation below 4V is not guaranteed and may result in failure to regulate or improper startup. For 3.3V-input applications, consider alternative regulators with lower VIN(min) specifications.
LTC3605EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-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):
- 14.85V
- Current - Output:
- 5A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3605EUF#TRPBF FAQ
1.How can I place an order for LTC3605EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3605EUF#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 LTC3605EUF#TRPBF reliable?
The price and inventory of LTC3605EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3605EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3605EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3605EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3605EUF#TRPBF?
LTC3605EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3605EUF#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 LTC3605EUF#TRPBF?
For technical support, including LTC3605EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3605EUF#TRPBF requirements.
6.How does Aetrix verify that LTC3605EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3605EUF#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 LTC3605EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3605EUF#TRPBF?
All LTC3605EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3605EUF#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 LTC3605EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3605EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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