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Analog Devices Inc. LTC3649EUFD#TRPBF
- Part No.:
- LTC3649EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3649EUFD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,109
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Product details
Overview
LTC3649EUFD#TRPBF from Analog Devices is a 60V input, 4A synchronous monolithic step-down regulator with rail-to-rail programmable output (0V to VIN – 0.5V), single-resistor VOUT programming, and peak current mode control. It integrates 110mΩ top/50mΩ bottom N-channel MOSFETs, supports 300kHz–3MHz switching frequency via RT resistor, and delivers 95% efficiency at 12VIN/5VOUT. Used in industrial power supplies requiring wide-input, high-current DC/DC conversion.
For engineers reviewing the LTC3649EUFD#TRPBF datasheet, LTC3649EUFD#TRPBF pinout, LTC3649EUFD#TRPBF application, or LTC3649EUFD#TRPBF equivalent, key selection considerations include its ±0.8% VOUT accuracy, 440µA regulated quiescent current, programmable output current limit, input voltage regulation for MPPT, and Burst Mode™ vs forced continuous mode trade-offs.
Technical Context
The LTC3649EUFD#TRPBF employs a peak current mode architecture with inherent cycle-by-cycle current limiting and fast transient response. Its error amplifier (transconductance 400–700µS) controls ITH to regulate average inductor current, while the 50µA ISET reference enables precise VOUT = 50µA × RSET programming without external sense resistors.
It features dual LDOs (INTVCC: 3.3V from VIN or 3.1V from EXTVCC ≥3.2V), programmable soft-start via ISET capacitor, and integrated wire-drop compensation using IMON feedback. Input voltage regulation (VINREG threshold = 2.0V ±0.15V) and overvoltage lockout (64–68V) support robust operation in automotive and solar MPPT systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 60V - supports wide-input industrial/solar/battery systems without pre-regulation |
| VOUT Range | 0V to (VIN – 0.5V) - enables rail-to-rail output including zero-volt regulation |
| IOUT Max | 4A - delivered continuously with thermal management via 4mm × 5mm QFN exposed pad |
| Switching Frequency | 300kHz to 3MHz (±50% sync range) - adjustable via RT resistor for EMI/noise optimization |
| VOUT Accuracy | ±0.8% - ensures stable load regulation across line, load, and temperature |
| IQ (Regulated) | 440µA - low standby power in active regulation, critical for always-on systems |
| IQ (Shutdown) | 18µA - enables ultra-low-power system sleep states |
| Current Monitoring | ±4% accuracy, 1:40,000 scaling on IMON - eliminates external sense resistor and associated losses |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN with exposed thermal pad (Pin 29 = SGND). Requires soldering of exposed pad to PCB ground for thermal performance (θJA = 43°C/W) and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1,2,26–28) | Power Ground | Low-impedance return path for high-current switch node; must be connected to thermal pad |
| VIN (3,4) | Main Input Supply | Accepts 3.1V–60V; powers internal circuitry and top/bottom MOSFETs |
| RUN (5) | Enable Control | Logic-high >1.2V starts regulation; hysteresis (120mV) prevents chatter near threshold |
| SGND (6,29) | Signal Ground | Reference for error amp, ISET, IMON; isolated from PGND for noise immunity |
| MODE/SYNC (7) | Operating Mode Select | GND = Burst Mode™; floating = forced continuous; external clock = synchronization |
| PGOOD (8) | Output Status Flag | Open-drain output asserts low when VOUT deviates >±1.5% from target (0.555V–0.645V at PGDFB) |
| PGDFB (9) | Power-Good Feedback | Connect resistor divider from VOUT to set PGOOD trip point |
| IMON (10) | Current Monitor Output | 1/40,000× IOUT; used for sensing, regulation, or cable drop compensation |
| VINREG (11) | Input Voltage Regulation Sense | Resistor divider from VIN sets 2.0V threshold for input droop protection or MPPT hold-up |
| RT (12) | Frequency Programming | Resistor to GND sets fSW: 33.3kΩ = 3MHz, 333.3kΩ = 300kHz |
| VOUT (13) | Error Amplifier Inverting Input | Connected directly to output; forms feedback loop with ISET reference |
| ISET (14) | VOUT Programming Reference | 50µA sink; VOUT = 50µA × RSET; capacitor adds soft-start |
| ITH (15) | Current Limit Threshold | Error amp output; sets peak inductor current; tied to INTVCC for internal compensation |
| EXTVCC (16) | External Bias Supply | Accepts 3.2V–28V to reduce LDO power loss; bypass with ≥1µF ceramic |
| INTVCC (17) | Internal LDO Output | 3.3V (from VIN) or 3.1V (from EXTVCC); bypass with ≥2.2µF ceramic |
| BOOST (18) | Bootstrap Supply | Drives top MOSFET gate; requires 0.1µF capacitor to SW |
| SW (19–25) | Switch Node | High-current connection to inductor; multiple pins reduce resistance and inductance |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output programming | VOUT adjustable from 0V to (VIN – 0.5V) enables zero-volt biasing and dynamic headroom control |
| Integrated MOSFETs | 110mΩ top / 50mΩ bottom N-channel switches eliminate external FETs and layout complexity |
| Accurate current monitoring | ±4% IMON output (1:40,000 scaling) replaces lossy sense resistors and improves efficiency |
| Programmable input voltage regulation | VINREG pin allows MPPT-like operation by reducing IOUT when input drops below 2.0V threshold |
| Burst Mode™ and forced continuous modes | Mode/SYNC pin selects between highest light-load efficiency (Burst) or lowest output ripple (FC) |
| Wire-drop compensation | Uses IMON feedback to dynamically raise VOUT and maintain constant voltage at remote load |
Applications
| Industrial Power Supplies | Solar MPPT Chargers |
|---|---|
Use Scenario: 24V/48V industrial bus powering PLC I/O modules with variable load profiles. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 5V/3.3V rails with high efficiency across wide input transients. Use Value: 95% efficiency at full load and 440µA quiescent current extend uptime in unattended equipment. | Use Scenario: Photovoltaic array interfacing where input voltage varies 20–60V and maximum power point tracking is required. IC Role / Device Role / Timing Role: Input-voltage-regulated buck converter using VINREG feedback to clamp input current during MPP transitions. Use Value: Programmable VINREG threshold (2.0V) enables direct implementation of analog MPPT algorithms without microcontroller. |
| Automotive Infotainment Systems | Test & Measurement Equipment |
Use Scenario: 12V vehicle battery powering FPGA-based display controllers with strict ripple and startup timing requirements. IC Role / Device Role / Timing Role: High-current DC/DC stage with forced continuous mode to suppress switching noise near sensitive analog circuits. Use Value: Low 10mV PGOOD hysteresis and ±0.8% VOUT accuracy ensure reliable FPGA configuration and memory retention. | Use Scenario: Bench power supply module requiring precise, programmable output voltage and current limiting. IC Role / Device Role / Timing Role: Regulated output stage with accurate IMON-based current monitoring and programmable ILIM (5.4–6.6A). Use Value: ±4% current sensing and 1:40,000 IMON scaling enable calibrated current limiting without calibration resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 42V max VIN, 0.5A IOUT, no integrated current monitor, lower integration | Designed for automotive 12V systems only; lacks IMON, VINREG, and rail-to-rail VOUT | Select if cost-sensitive, low-current (<0.5A), and automotive AEC-Q100 qualification required. |
| MP2451DT-LF-Z | 36V max VIN, 0.6A IOUT, fixed 5V/3.3V outputs, no programmable frequency or current limit | Entry-level buck for fixed-output consumer electronics; no ISET/IMON/VINREG functionality | Select only for simple, low-power, fixed-VOUT applications where programmability is unnecessary. |
Compared with LM5164QPWPRQ1 and MP2451DT-LF-Z, the LTC3649EUFD#TRPBF provides significantly higher input voltage (60V), output current (4A), and feature integration-including rail-to-rail VOUT, accurate current monitoring, and input voltage regulation-making it suitable for demanding industrial, solar, and test equipment designs where flexibility and precision are critical.
Availability
LTC3649EUFD#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, solar MPPT chargers, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3649EUFD#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC3649EUFD#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for wide-input, high-current DC/DC conversion in harsh environments where reliability, accuracy, and feature integration are essential.
FAQ
What is the maximum input voltage rating for the LTC3649EUFD#TRPBF?
The LTC3649EUFD#TRPBF has an absolute maximum input voltage rating of 64V, with recommended operating range up to 60V. It includes built-in overvoltage lockout that suspends switching when VIN exceeds 64–68V, protecting internal MOSFETs from transient spikes. This makes the LTC3649EUFD#TRPBF suitable for 48V industrial buses and photovoltaic inputs.
How is the output voltage programmed on the LTC3649EUFD#TRPBF?
The LTC3649EUFD#TRPBF uses a precision 50µA current source at the ISET pin to program VOUT via a single resistor to SGND: VOUT = 50µA × RSET. For example, a 100kΩ resistor sets VOUT = 5.0V. The LTC3649EUFD#TRPBF achieves ±0.8% output accuracy across line, load, and temperature using this method.
Does the LTC3649EUFD#TRPBF support output current limiting and monitoring without external components?
Yes. The LTC3649EUFD#TRPBF provides accurate ±4% output current monitoring via the IMON pin (1:40,000 scaling), and programmable current limiting by setting VIMON = 2V threshold. No external sense resistor is needed. This capability is intrinsic to the LTC3649EUFD#TRPBF design and validated across its –40°C to 125°C operating range.
What thermal management is required for the LTC3649EUFD#TRPBF in 4A operation?
The LTC3649EUFD#TRPBF in the 28-lead 4mm × 5mm QFN package requires soldering of the exposed thermal pad (Pin 29 = SGND) to a minimum 200mm² copper pour for θJA = 43°C/W. At 4A continuous load with 24VIN/5VOUT, junction temperature rise is ~45°C above ambient under typical PCB conditions, well within the 125°C TJMAX limit.
Can the LTC3649EUFD#TRPBF operate with zero-volt output?
Yes. The LTC3649EUFD#TRPBF supports true 0V output by connecting the ISET pin directly to SGND (RSET = 0Ω), enabling rail-to-rail regulation from 0V to (VIN – 0.5V). This is confirmed in the datasheet's VOUT operating range specification and used in biasing and negative-rail generation applications.
LTC3649EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-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):
- 3.1V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- 55V
- Current - Output:
- 4A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3649EUFD#TRPBF FAQ
1.How can I place an order for LTC3649EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3649EUFD#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 LTC3649EUFD#TRPBF reliable?
The price and inventory of LTC3649EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3649EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3649EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3649EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3649EUFD#TRPBF?
LTC3649EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3649EUFD#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 LTC3649EUFD#TRPBF?
For technical support, including LTC3649EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3649EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3649EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3649EUFD#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 LTC3649EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3649EUFD#TRPBF?
All LTC3649EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3649EUFD#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 LTC3649EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3649EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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