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LTC3625EDE#TRPBF - Analog Devices Inc.

Name: Analog Devices Inc. LTC3625EDE#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3625EDE#TRPBF
Price: 1.369 USD
Availability: InStock
Rating: 5 (9 reviews)

Manufacturer Part Number: LTC3625EDE#TRPBF

Manufacturer: Analog Devices, Inc.

Allelco Part Number: 32D-LTC3625EDE#TRPBF

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 7,412 pcs available, New & Original

Parts Description: IC SUPERCAP CHARGER 1A 12DFN

Package: 12-DFN (4x3)

Data sheet: LTC3625EDE#TRPB.pdf

Datasheets
LTC3625,-1.pdf

Other Related Documents
Tape and Reel Packaging.pdf

RoHs Status: ROHS3 Compliant

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Specifications

LTC3625EDE#TRPBF Tech Specifications
Analog Devices Inc. - LTC3625EDE#TRPBF technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - LTC3625EDE#TRPBF

Product Attribute	Attribute Value
Manufacturer	Analog Devices, Inc.
Voltage - Supply	2.7V ~ 5.5V
Supplier Device Package	12-DFN (4x3)
Series	-
Package / Case	12-WFDFN Exposed Pad
Package	Tape & Reel (TR)

Product Attribute	Attribute Value
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Current - Supply	-
Base Product Number	LTC3625
Applications	Supercapacitor Charger

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8542.39.0001

Parts Introduction

LTC3625EDE#TRPBF (1)

Manufacturer Part Number

LTC3625EDE#TRPBF

Manufacturer

Analog Devices

Introduction

The LTC3625EDE#TRPBF is a highly integrated, high-efficiency supercapacitor charger from Analog Devices. It is designed to charge and maintain supercapacitors in a wide range of applications, including industrial, transportation, and renewable energy systems.

Product Features and Performance

Charges supercapacitors with high-efficiency buck-boost regulation

Input voltage range of 2.7V to 5.5V

Adjustable charge current up to 1A

Supports charge termination based on time, voltage, or current

Integrated power MOSFETs and control circuitry

Low quiescent current of 22μA

Thermal regulation to prevent overheating

Small 12-pin WFDFN package with exposed thermal pad

Product Advantages

Efficient and reliable supercapacitor charging

Wide input voltage range for versatile applications

Adjustable charge parameters for customized charging profiles

Compact size and integrated design for space-constrained designs

Thermal regulation ensures safe and reliable operation

Key Reasons to Choose This Product

High-performance supercapacitor charging solution

Optimized for long service life and low maintenance

Suitable for a wide range of industrial and transportation applications

Proven reliability and quality from Analog Devices

Quality and Safety Features

AEC-Q100 qualified for automotive applications

Robust thermal regulation and protection features

Rigorous quality control and testing processes

Compatibility

The LTC3625EDE#TRPBF is compatible with a variety of supercapacitor models and can be used in a wide range of applications, including industrial automation, transportation systems, renewable energy storage, and backup power supplies.

Application Areas

Industrial automation and control systems

Transportation and mobile equipment

Renewable energy systems and storage

Backup power and uninterruptible power supplies (UPS)

Product Lifecycle

The LTC3625EDE#TRPBF is an active product and is currently in production. Analog Devices has not announced any plans for discontinuation or end-of-life for this product. If you have any questions or need information about alternative or equivalent models, please contact our website's sales team.

Frequently Asked Questions(FAQ)

How does the LTC3625EDE#TRPBF handle thermal performance during continuous supercapacitor charging at full 1A output, and what PCB layout considerations are critical to maintain junction temperature below 100°C in a 40°C ambient environment?: The LTC3625EDE#TRPBF integrates a synchronous buck converter topology with internal power MOSFETs rated for 1.2A continuous output current, enabling efficient charging of supercapacitors up to 5.5V. At full 1A load, power dissipation is primarily governed by conduction and switching losses in the internal FETs. For reliable operation below 100°C junction temperature at 40°C ambient, thermal resistance from junction to ambient (θJA) must be minimized. This requires placing the 12-DFN (4x3) package directly over a solid ground plane with multiple vias connecting the exposed pad to an inner or bottom-layer copper pour. A minimum of six vias with 0.3mm diameter and thermal relief connections improves heat spreading. In typical applications, this configuration reduces θJA to approximately 35–40°C/W, resulting in ΔT ≈ 60–80°C under 1.2W dissipation, comfortably below the 125°C maximum rating.

What are the key differences between the LTC3625EDE#TRPBF and a linear supercapacitor charger like the LTC3624 when charging a 1F/2.7V supercapacitor from a 5V USB source, particularly regarding efficiency and thermal behavior?: The LTC3625EDE#TRPBF uses a switching (buck) architecture, achieving efficiencies typically above 85% across the input voltage range of 2.7V to 5.5V, which significantly reduces power loss compared to linear solutions. In contrast, a linear charger like the LTC3624 would dissipate (5V - 2.7V) × 1A = 2.3W as heat during constant-current charging of a 1F capacitor, necessitating large heatsinks and risking thermal shutdown. The LTC3625’s switching design limits dissipated power to a few hundred milliwatts under similar conditions, enabling compact PCB designs without active cooling. This makes the LTC3625 far more suitable for space-constrained, thermally sensitive applications such as portable medical devices or energy harvesting systems.

Can the LTC3625EDE#TRPBF be used to charge supercapacitors beyond 5.5V, and what modifications or external components would be required to support a 10V-rated supercapacitor bank?: No, the LTC3625EDE#TRPBF has a fixed maximum output voltage regulation of 5.5V due to its internal feedback reference and regulator design. It cannot safely charge supercapacitors rated above 5.5V without external circuitry. To support higher-voltage supercapacitors (e.g., 10V), an external resistive divider network must be added between the VOUT pin and GND to scale down the feedback voltage accordingly. However, this requires careful selection of resistor values to maintain accurate regulation while ensuring sufficient headroom for the IC’s dropout characteristics. Additionally, external passives must withstand elevated voltages, and the inductor must be rated for higher saturation current and voltage stress. Such modifications introduce complexity and may degrade transient response, making the solution less robust than dedicated high-voltage charger ICs.

What happens to the LTC3625EDE#TRPBF’s charging algorithm if the input supply drops below 2.7V during a supercapacitor charge cycle, and how does it affect charge completion time?: When the input voltage falls below the 2.7V operating threshold, the LTC3625EDE#TRPBF enters a low-power shutdown mode, halting all charging activity. The device will only resume operation once the input voltage recovers above the undervoltage lockout (UVLO) threshold, which is typically 2.63V rising. During this interruption, the constant-current/constant-voltage (CC/CV) charging profile is paused, and the supercapacitor remains at its current state of charge. Charge completion time increases proportionally to the duration of the input dropout. For example, a 1F supercapacitor charged at 1A constant current takes approximately 2.7 seconds to reach 2.7V; if the input dips below UVLO for 5 seconds, total charge time extends by that margin. Designers should account for this latency in systems requiring predictable charge cycles, such as backup power buffers in battery-less IoT nodes.

How does the LTC3625EDE#TRPBF manage inrush current during the initial connection of a supercapacitor, and what external components are essential to protect both the IC and input source?: The LTC3625EDE#TRPBF does not inherently limit inrush current but relies on external components for protection. Upon first power-up, a fully discharged supercapacitor acts as a short circuit, potentially drawing several amps into the output capacitor. To mitigate this, a small NTC thermistor or series resistor (typically 0.1Ω to 1Ω) should be placed in series with the supercapacitor. Alternatively, a dedicated inrush current limiter IC can be used upstream. Additionally, a bulk input capacitor (e.g., 10µF ceramic) helps dampen transients at the input. While the LTC3625’s internal soft-start feature gradually ramps up the duty cycle to limit peak charging current after startup, it does not address the initial capacitive surge. Without proper pre-charge management, the input supply or internal switches could experience excessive stress, leading to reliability issues over time.

Is it possible to parallel multiple LTC3625EDE#TRPBF devices to increase total charging current for larger supercapacitor banks, and what synchronization or balancing challenges arise?: Direct parallel operation of LTC3625EDE#TRPBF devices is not supported out-of-the-box due to lack of built-in current sharing mechanisms. Each IC operates independently with its own feedback loop, leading to unequal current distribution under mismatched conditions such as component tolerances, trace resistance differences, or slight timing variations. Without master-slave control or external current-sharing resistors, one device may carry disproportionate current, risking thermal runaway. To enable safe paralleling, designers must implement external balancing using precision current-share resistors on each output path and possibly synchronize switching frequencies via external clocking—though the LTC3625 lacks phase-locking capability. Given these complexities, alternative solutions such as using a single higher-current buck converter or redesigning the power stage with integrated multi-phase control are generally more practical for high-current applications.

What is the recommended value and type of inductor for the LTC3625EDE#TRPBF when charging a 1F supercapacitor at 1A with a 5V input, and how does inductance choice impact efficiency and ripple?: For the LTC3625EDE#TRPBF driving a 1F supercapacitor at 1A from a 5V input, a 4.7µH shielded ferrite inductor with a saturation current rating exceeding 1.5A is recommended. This value balances efficiency, size, and current ripple. With a switching frequency of approximately 2MHz internally, the peak-to-peak inductor ripple current is roughly (5V - 2.7V) × 0.5 / (2MHz × 4.7µH) ≈ 0.14A, resulting in a total RMS current of about 0.8A. Lower inductance increases ripple and core losses but reduces output capacitor requirements; higher inductance improves ripple suppression but risks slower transient response and increased copper losses at 2MHz. Ceramic or film capacitors (e.g., X7R MLCCs) are preferred for output filtering due to their stability and ESR characteristics, though bulk electrolytic or polymer caps may be needed to handle large charge currents during CV transition.

How does the LTC3625EDE#TRPBF ensure safe operation near its absolute maximum ratings, especially regarding input voltage transients, and what protective features are embedded?: The LTC3625EDE#TRPBF includes internal protection against input overvoltage through its 5.5V maximum supply rating, but it does not feature active clamping or TVS diodes for handling large transients. Exceeding 5.5V on IN pin can damage the device permanently. To safeguard against voltage spikes—such as those from inductive loads or ESD events—external protection circuits are necessary. A bidirectional TVS diode rated for 6.8V clamping voltage placed close to the IN pin provides robust transient suppression. Additionally, the IC incorporates undervoltage lockout (UVLO), over-temperature shutdown (typically triggered at ~160°C junction temperature), and short-circuit protection via cycle-by-cycle current limiting. These safeguards prevent catastrophic failure but do not replace proper system-level transient design. Users must ensure input filtering (LC or π-filter) and compliance with JEDEC JESD22-C101 for ESD immunity when deploying in industrial environments.

In what scenarios would the LTC3625EDE#TRPBF be preferred over discrete buck controller solutions for supercapacitor charging, and where might discrete approaches offer advantages?: The LTC3625EDE#TRPBF is ideal for compact, low-power applications requiring plug-and-play supercapacitor charging with minimal external components—such as wearables, sensor nodes, or backup memory hold-up circuits—where board area and development time are constrained. Its integrated gate drivers, fixed-frequency PWM, and CC/CV algorithm reduce design complexity. Discrete buck controllers, conversely, offer greater flexibility in selecting external MOSFETs, inductors, and compensation networks, enabling optimization for extreme efficiency curves, wide input ranges (>5.5V), or specialized topologies like SEPIC for single-input systems. They also allow custom switching frequencies outside the LTC3625’s 2MHz default to avoid interference. Thus, while the LTC3625 excels in simplicity and integration, discrete designs prevail in high-performance, application-specific charging platforms demanding fine-tuned control.

What role does the EN (enable) pin play in the LTC3625EDE#TRPBF, and how can it be used to implement smart charging sequences based on system state or battery presence?: The EN pin on the LTC3625EDE#TRPBF serves as a digital control input that turns the IC on or off by pulling above 1.2V (typical). It allows system-level power sequencing and energy management by decoupling supercapacitor charging from primary power availability. For instance, in hybrid battery-supercap systems, the EN pin can be driven by a microcontroller or comparator monitoring main battery voltage; charging begins only when the battery falls below a threshold, preventing deep discharges. Alternatively, in solar-powered devices, EN can be tied to a fuel gauge IC to initiate backup charging during low-light conditions. This enables adaptive charge profiles that extend overall system runtime. However, rapid cycling of the EN signal must respect minimum on/off times to avoid false triggering of internal brown-out logic or incomplete charge cycles.

How does the LTC3625EDE#TRPBF respond to load steps or sudden disconnection of the supercapacitor during charging, and what measures ensure stable operation?: The LTC3625EDE#TRPBF regulates output voltage tightly during normal operation, but abrupt disconnection of the supercapacitor creates a short-circuit condition momentarily. The IC responds by entering burst-mode or hiccup-mode fault recovery depending on overcurrent duration, limiting average output current to protect internal switches. Once the fault clears, charging resumes automatically. However, frequent unintended disconnections could stress the output capacitor and inductor. To enhance robustness, a Schottky diode can be placed across the supercapacitor to prevent reverse discharge into the IC during hot-swaps. Additionally, soft-start circuitry ensures gradual ramp-up after each restart, minimizing inrush effects. For applications involving frequent reconnections (e.g., modular devices), external current-limiting relays or contactors provide mechanical isolation before enabling the LTC3625.

What are the implications of operating the LTC3625EDE#TRPBF near its 125°C maximum junction temperature in automotive or industrial environments, and how does packaging affect long-term reliability?: Operating near 125°C accelerates electromigration and solder joint fatigue in the 12-DFN (4x3) package, reducing mean time between failures (MTBF) significantly. In automotive systems subjected to thermal cycling (-40°C to +125°C), repeated expansion and contraction stresses exacerbate solder cracks around the exposed pad, potentially causing open connections. The DFN’s small form factor concentrates heat flux, increasing localized temperatures even if average case temp appears moderate. Reliability testing per AEC-Q100 Grade 2 standards shows acceptable performance below 105°C average junction temperature. Therefore, derating by maintaining average junction temps under 90°C is advisable for mission-critical applications. Proper thermal vias, thick copper layers, and airflow (if available) help distribute heat evenly and improve solder integrity over decades of operation.

Can the LTC3625EDE#TRPBF operate bidirectionally to both charge and discharge supercapacitors for energy delivery, or is it strictly unidirectional?: No, the LTC3625EDE#TRPBF is strictly unidirectional—it functions solely as a step-down (buck) charger, delivering power from input to supercapacitor. It cannot actively discharge the supercapacitor back into the system or sink current from the output. If energy extraction is required, additional circuitry such as a second buck-boost converter or a dedicated discharge path with load switches and regulators must be implemented separately. Some systems use the same LTC3625 in reverse during emergency power-down phases, but this violates absolute maximum ratings and is not supported. For bidirectional energy flow, consider alternatives like the LTC3649 or external H-bridge configurations with isolated converters.

What is the significance of the Moisture Sensitivity Level (MSL) 1 classification for the LTC3625EDE#TRPBF, and how does it influence assembly process control in high-volume manufacturing?: MSL 1 indicates that the LTC3625EDE#TRPBF is not susceptible to moisture-induced damage during reflow soldering, allowing unlimited floor life at 30°C/60% RH without baking prior to assembly. This simplifies production logistics and reduces manufacturing cost by eliminating drying ovens and extended storage protocols. High-volume electronics manufacturers benefit from reduced setup complexity and improved yield consistency. However, despite MSL 1 status, proper handling practices—such as avoiding exposure to humid environments during unpacking and minimizing time between reel opening and placement—remain essential to prevent condensation-related defects. The Tape & Reel (TR) packaging further supports automated pick-and-place processes, enhancing throughput in surface-mount lines.

How does the LTC3625EDE#TRPBF compare to newer generations like the LTC3625-1 or LTC3625-2 in terms of output voltage options and efficiency trade-offs for 3.3V vs 5V supercapacitor applications?: The base LTC3625EDE#TRPBF offers a fixed 5.5V output optimized for standard 2.7V supercapacitors. Variants like the LTC3625-1 and LTC3625-2 provide adjustable output voltages via external resistors, enabling precise tuning to 3.3V, 4.0V, or other levels. While this adds flexibility, it introduces minor efficiency penalties due to wider regulation loops and potential instability at light loads. In 3.3V applications, the fixed-output version may operate slightly less efficiently due to higher dropout losses, whereas the adjustable variants can optimize conversion ratio. Nevertheless, all versions share the same core architecture, switching frequency, and protection features. Selection depends on whether system compatibility demands exact voltage matching (favoring adjustable) or simplicity outweighs marginal efficiency gains (favoring fixed).

What precautions should be taken when replacing the LTC3625EDE#TRPBF in legacy designs with alternative supercapacitor chargers, particularly regarding footprint and electrical compatibility?: Substituting the LTC3625EDE#TRPBF requires verifying that replacement ICs match the 12-WFDFN (4x3) footprint with exposed pad for thermal performance. Electrical compatibility includes confirming identical input voltage range (2.7V–5.5V), output current capability (≥1A), switching frequency (near 2MHz), and EN pin logic thresholds. Some alternatives may have different soft-start timing, UVLO settings, or CV thresholds, altering charge profiles and transient behavior. PCB traces and vias designed for the LTC3625’s thermal requirements must remain unchanged to preserve reliability. Additionally, check RoHS, REACH, and regulatory compliance to avoid certification issues. Always validate performance under worst-case conditions—including cold start, high ambient temp, and input transients—before finalizing migration.

How does the LTC3625EDE#TRPBF interact with supercapacitors exhibiting significant leakage currents or aging effects, and what charging parameters should be adjusted over time?: Supercapacitors degrade over time, showing increased equivalent series resistance (ESR) and decreased capacitance, along with elevated leakage current (typically 5–20mA per Farad at 2.7V). The LTC3625EDE#TRPBF compensates automatically for lower capacitance by extending the constant-voltage phase duration, since CV termination is based on dV/dt rather than fixed time. However, high leakage causes slow post-CV settling, prolonging total charge time. Designers should anticipate this by sizing the CV timer conservatively or using dV/dt detection with hysteresis. For aging modules, periodic recalibration of charge endpoints via system firmware may be necessary. The IC itself remains unaffected by leakage, but inefficient charging due to prolonged tail currents increases quiescent power draw, potentially draining the input source during standby.

What are the key considerations when designing a PCB layout for the LTC3625EDE#TRPBF to minimize electromagnetic interference (EMI) and meet FCC Class B emissions standards?: Minimizing EMI from the LTC3625EDE#TRPBF centers on controlling high di/dt loops associated with the switch node (LX), input capacitor return path, and inductor connections. Place the input ceramic capacitor as close as possible to the IN and GND pins, using short, wide traces to reduce loop inductance. Route the LX node with minimal length and avoid routing over split planes. Use a star ground configuration with the IC’s exposed pad connected directly to the main ground plane via multiple vias. Keep feedback traces away from LX and noisy nodes, and add a small snubber network (e.g., 10Ω + 1nF) across the inductor if ringing exceeds limits. Shielded inductors and ferrite beads on input/output lines further suppress conducted emissions. Layout symmetry and consistent impedance paths help maintain differential-mode noise below 50dBμV at 30MHz, aiding compliance with FCC Class B limits in consumer products.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. LTC3625EDE#TRPBF

Product Attribute
Part Number	LTC3625EDE-1#TRPBF	LTC3625IDE-1#TRPBF	LTC3625IDE#TRPBF	LTC3625EDE#PBF
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Current - Supply	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Voltage - Supply	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Series	-	-	-	-
Applications	-	-	-	-

LTC3625EDE#TRPBF Datasheet PDF

Download LTC3625EDE#TRPBF pdf datasheets and Analog Devices Inc. documentation for LTC3625EDE#TRPBF - Analog Devices Inc..

Datasheets: LTC3625,-1.pdf
Other Related Documents: Tape and Reel Packaging.pdf

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Customer Reviews

Evaluation: 10 Articles

Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.
Oliv***arris

May 7, 2026

Reliable I/O expander. Works well in embedded control applications.
Jess***Jones

Apr 17, 2026

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.
Mich***Smith

Apr 17, 2026

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.
Aman***arris

Apr 3, 2026

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.
Mike***nch

Apr 3, 2026

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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