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Home Products Integrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching Regulators~~LT3470AEDDB#TRPBF~~

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LT3470AEDDB#TRPBF - Analog Devices Inc.

Name: Analog Devices Inc. LT3470AEDDB#TRPBF
Brand: Analog Devices Inc.
SKU: LT3470AEDDB#TRPBF
Availability: InStock
Rating: 5 (5 reviews)

Manufacturer Part Number: LT3470AEDDB#TRPBF

Manufacturer: Analog Devices, Inc.

Allelco Part Number: 32D-LT3470AEDDB#TRPBF

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 8,358 pcs available, New & Original

Parts Description: IC REG BUCK ADJ 250MA 8DFN

Package: 8-DFN (3x2)

Data sheet: LT3470AEDDB#TRP.pdf

Datasheets
Cylindrical Battery Holders.pdf

Environmental Information
Material Declaration LT3470AEDDB#TRPBF.pdf

Other Related Documents
Tape and Reel Packaging.pdf

RoHs Status: ROHS3 Compliant

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In stock: 8358

Specifications

LT3470AEDDB#TRPBF Tech Specifications
Analog Devices Inc. - LT3470AEDDB#TRPBF technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - LT3470AEDDB#TRPBF

Product Attribute	Attribute Value
Manufacturer	Analog Devices, Inc.
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	16V
Voltage - Input (Min)	4V
Voltage - Input (Max)	40V
Topology	Buck
Synchronous Rectifier	No
Supplier Device Package	8-DFN (3x2)
Series	-
Package / Case	8-WFDFN Exposed Pad

Product Attribute	Attribute Value
Package	Tape & Reel (TR)
Output Type	Adjustable
Output Configuration	Positive
Operating Temperature	0°C ~ 85°C (TA)
Number of Outputs	1
Mounting Type	Surface Mount
Function	Step-Down
Frequency - Switching	-
Current - Output	250mA
Base Product Number	LT3470

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

LT3470AEDDB#TRPBF (1)

Manufacturer Part Number

LT3470AEDDB#TRPBF

Manufacturer

analog-devices

Introduction

The LT3470AEDDB#TRPBF is a high-efficiency, 250mA, 40V, synchronous step-down regulator from Analog Devices. It features a wide input voltage range, adjustable output voltage, and a compact 8-lead DFN package, making it suitable for a variety of applications.

Product Features and Performance

Wide input voltage range: 4V to 40V

Adjustable output voltage from 1.25V to 16V

Output current capability up to 250mA

High efficiency of up to 95%

Switching frequency up to 2MHz

Integrated low RDS(ON) power switches

Thermal shutdown and current limit protection

Small 8-lead DFN package (3mm x 2mm)

Product Advantages

Wide input voltage range for flexibility in design

Adjustable output voltage for customized power requirements

High efficiency for improved power delivery and thermal performance

Compact package size for space-constrained applications

Robust protection features for reliable operation

Key Reasons to Choose This Product

Excellent power conversion efficiency for extended battery life or reduced heat dissipation

Versatile input and output voltage range for diverse application requirements

Compact size and surface mount package for space-saving designs

Reliable operation with built-in protection features

Quality and Safety Features

Thermal shutdown protection

Current limit protection

ESD protection

Compatibility

The LT3470AEDDB#TRPBF is compatible with a wide range of electronic devices and systems that require a compact, high-efficiency, and adjustable DC-DC converter.

Application Areas

Portable electronics

Industrial equipment

Automotive systems

Telecommunications equipment

Distributed power supplies

Product Lifecycle

The LT3470AEDDB#TRPBF is an active product and is currently in production. There are no announced plans for discontinuation at this time. Customers are advised to check with our website's sales team or their authorized distributors for the latest product information and availability.

Frequently Asked Questions(FAQ)

How does the LT3470AEDDB#TRPBF compare to other buck regulators in terms of input voltage range and output current capability when designing a 5V-to-3.3V conversion for a low-power IoT sensor node?: The LT3470AEDDB#TRPBF supports an input voltage range from 4V to 40V, making it suitable for industrial and automotive environments where transient spikes or wide supply variations may occur. Its maximum output current is 250mA, which is sufficient for powering low-power microcontrollers and sensors in battery-operated systems. When stepping down from 5V to 3.3V, this regulator operates efficiently with minimal dropout and maintains stable regulation across the full operating temperature range. Compared to fixed-output regulators at similar currents, the adjustable output allows precise tuning of the 3.3V rail, reducing the need for additional post-regulation circuitry.

What are the key thermal considerations when using the LT3470AEDDB#TRPBF in a compact PCB layout with limited copper area?: The LT3470AEDDB#TRPBF is housed in an 8-DFN (3x2) package with an exposed pad, enabling efficient heat dissipation when properly soldered to a ground plane. In designs with restricted copper area, thermal performance depends heavily on the use of thermal vias under the exposed pad. With a continuous load of 250mA and a 12V-to-5V conversion, power dissipation can reach approximately 1.75W, necessitating careful thermal management. Without adequate heat spreading, junction temperatures may exceed 85°C under ambient conditions, potentially leading to thermal shutdown or reduced reliability.

Can the LT3470AEDDB#TRPBF be used in a battery-powered system with a single-cell Li-ion source that varies between 3.0V and 4.2V?: While the LT3470AEDDB#TRPBF accepts inputs down to 4V, a fully discharged single-cell Li-ion battery (3.0V) falls below this threshold. Therefore, it cannot directly regulate from such a source unless paired with a pre-boost stage. However, during normal operation (above 4V), it functions effectively. For low-voltage applications, consider alternative topologies or devices with lower minimum input voltages. This limitation must be evaluated early in the system architecture phase to avoid unexpected brown-out conditions.

How does the adjustable output feature of the LT3470AEDDB#TRPBF impact stability and compensation network design compared to a fixed-output regulator?: The adjustable output requires external feedback resistors to set the output voltage, typically using a resistive divider from VOUT to GND. Stability depends on selecting appropriate resistor values and ensuring minimal loading on the feedback node. Unlike fixed-output regulators with internal compensation, the LT3470AEDDB#TRPBF uses a Type-II compensation scheme optimized for ceramic capacitors, but external component selection affects phase margin. Designers must verify stability across temperature and load conditions, especially when using high-value feedback resistors that increase sensitivity to noise and leakage currents.

What precautions should be taken when selecting input and output capacitors for the LT3470AEDDB#TRPBF to ensure reliable operation over temperature extremes?: Input and output capacitors must maintain stable capacitance and equivalent series resistance (ESR) across the entire operating temperature range. Ceramic capacitors (X5R or X7R dielectrics) are recommended due to their low ESR and small footprint. For input filtering, a 1µF to 10µF capacitor is typical; output capacitance of 2.2µF to 10µF with low ESL is preferred. Avoid polymer or tantalum types unless specifically rated for the temperature range. Additionally, place these capacitors as close as possible to the IC pins to minimize parasitic inductance, which can degrade transient response and introduce instability at high switching frequencies.

Is the LT3470AEDDB#TRPBF suitable for automotive applications requiring AEC-Q100 qualification?: No, the LT3470AEDDB#TRPBF is not specified for automotive environments and lacks AEC-Q100 certification. It is designed for industrial-grade operation within a -40°C to +85°C junction temperature range, but its datasheet only guarantees performance up to TA = 85°C. Automotive systems often require wider temperature ranges (-40°C to +125°C) and rigorous environmental testing. If used in an automotive context without proper derating and validation, long-term reliability could be compromised due to thermal cycling, humidity, or EMI exposure.

How does the lack of synchronous rectification in the LT3470AEDDB#TRPBF affect efficiency in high-input-to-output differential scenarios?: The LT3470AEDDB#TRPBF uses a non-synchronous topology, meaning it relies on a diode for freewheeling current instead of a MOSFET. This results in higher conduction losses and reduced efficiency, particularly in high step-down ratios such as 12V-to-3.3V. At 250mA load, efficiency might drop below 80% depending on switching frequency and component selection. While acceptable for light-load applications, this architecture is less efficient than synchronous alternatives under heavy loads. Designers should simulate worst-case power loss and consider thermal budget constraints accordingly.

What role does the switching frequency play in the overall system design when using the LT3470AEDDB#TRPBF, and how is it configured?: Although the datasheet does not explicitly list a fixed switching frequency, the LT3470AEDDB#TRPBF operates in a fixed-frequency PWM mode, allowing predictable timing and simplified EMI filtering. Frequency selection impacts inductor size, capacitor ripple current, and efficiency. Higher frequencies enable smaller magnetics but increase switching losses. Typical values fall between 1MHz and 2MHz based on application notes. Designers must balance size, efficiency, and electromagnetic compatibility when choosing external components. Noise-sensitive environments may benefit from spread-spectrum techniques or careful layout shielding.

How does the LT3470AEDDB#TRPBF compare to the LT3470 variant in terms of performance and availability?: The LT3470AEDDB#TRPBF includes the "A" revision, which typically denotes improved performance specifications such as tighter output voltage accuracy, better line and load regulation, or enhanced thermal characteristics. While both share the same core architecture, the "A" version may offer superior reliability under stress conditions. Availability-wise, the "#TRPBF" suffix indicates tape-and-reel packaging with Pb-free finish, suitable for automated assembly. Always consult the latest datasheet for exact differences, as Analog Devices may update models incrementally without major functional changes.

What are the implications of using the LT3470AEDDB#TRPBF near its maximum output current of 250mA in a continuous-duty application?: Continuous operation at 250mA approaches the device’s thermal limits, especially with elevated ambient temperatures or poor heatsinking. The package has a maximum junction-to-air thermal resistance (θJA) around 42°C/W, so even modest power dissipation can cause significant temperature rise. To operate safely, derate the output current based on actual thermal conditions. For example, at 12V in and 3.3V out, input current would be roughly 75mA, resulting in ~1W loss—requiring attention to PCB copper area and airflow. Monitoring junction temperature via thermal modeling or empirical testing ensures long-term reliability.

Can the LT3470AEDDB#TRPBF be paralleled to increase output current capacity?: Generally, paralleling linear regulators is discouraged due to unequal current sharing unless matched precisely. The LT3470AEDDB#TRPBF is not designed for parallel operation, and doing so without balancing components increases risk of thermal runaway or failure. Each unit will naturally diverge in behavior due to manufacturing tolerances. If higher current is required, consider upgrading to a synchronous buck controller capable of multi-phase operation or selecting a different regulator with higher inherent current rating. Attempting to parallel this device adds unnecessary complexity and reduces system robustness.

How does the LT3470AEDDB#TRPBF handle start-up behavior when powered through a large bulk capacitor or long cable inductance?: The LT3470AEDDB#TRPBF features soft-start functionality that limits inrush current during start-up, helping protect upstream circuitry. However, if the input source has significant inductance (e.g., from a long cable), voltage ringing or overshoot can occur due to LC resonance with the input capacitor. In such cases, adding a small series resistor or ferrite bead near the input pin may dampen oscillations. Additionally, ensure the input capacitor value and type do not exacerbate transients. Proper decoupling and layout remain critical to maintaining stable start-up across all conditions.

What are the typical applications where the LT3470AEDDB#TRPBF offers advantages over LDO regulators?: The LT3470AEDDB#TRPBF excels in applications requiring high input-to-output differentials where LDOs would dissipate excessive power. For instance, converting 15V to 5V at 200mA generates ~2W of waste heat in an LDO but only ~2.5W total in the buck converter, with much of it managed by switching dynamics. This makes the LT3470AEDDB#TRPBF ideal for industrial control modules, LED drivers, or legacy power rails feeding modern digital circuits. It also improves battery life in portable systems by minimizing quiescent power loss compared to linear solutions.

How does the RoHS compliance status of the LT3470AEDDB#TRPBF influence global market access and manufacturing processes?: As a RoHS3 compliant device, the LT3470AEDDB#TRPBF contains no restricted substances above regulatory thresholds, including lead, mercury, cadmium, and certain flame retardants. This ensures compatibility with international environmental standards such as EU Directive 2011/65/EU and China RoHS. Manufacturers benefit from simplified supply chain integration, reduced risk of production halts due to material restrictions, and alignment with corporate sustainability goals. It also facilitates end-of-life recycling and supports export to regions with strict hazardous substance controls.

What steps should be taken to validate the LT3470AEDDB#TRPBF performance before committing to mass production?: Comprehensive prototype testing should include line and load regulation sweeps, thermal cycling, and transient response analysis under worst-case conditions. Measure efficiency across the full load range, monitor junction temperature using infrared imaging or embedded diagnostics, and verify EMI compliance per CISPR standards. Also test reliability aspects like solder joint integrity after reflow and mechanical shock/vibration if applicable. Functional verification must cover start-up, shutdown, overcurrent protection, and fault recovery sequences. Only after passing these tests should the design move toward pilot production, with ongoing monitoring for any field returns or anomalies.

How does the moisture sensitivity level (MSL) rating of MSL 1 for the LT3470AEDDB#TRPBF affect storage and handling procedures in a high-volume manufacturing environment?: An MSL 1 rating means the LT3470AEDDB#TRPBF is not sensitive to moisture absorption and can be stored indefinitely in dry conditions without baking prior to reflow soldering. This simplifies inventory management and reduces handling costs in high-volume assembly lines. Standard packaging (tape and reel) protects the device during transport, and no special desiccant requirements apply. However, operators should still follow standard ESD protocols due to semiconductor sensitivity, even though moisture-related failures are unlikely given the MSL classification.

What impact does the absence of a dedicated enable pin have on system-level power sequencing when integrating the LT3470AEDDB#TRPBF?: The LT3470AEDDB#TRPBF uses input voltage level as the primary control signal for turn-on and turn-off. Power sequencing must therefore be managed externally—either by ramping the input supply gradually or using an auxiliary switch. This approach complicates dynamic power management compared to regulators with explicit enable pins, where logic-level control enables flexible sleep/wake cycles. Designers must ensure that input voltage transitions do not trigger unintended activation, possibly requiring RC delays or supervisory circuits to stabilize startup conditions before full operation commences.

How can the LT3470AEDDB#TRPBF contribute to meeting EMI requirements in space-constrained consumer electronics?: Despite its small size, the LT3470AEDDB#TRPBF generates conducted and radiated emissions due to high-speed switching edges. To mitigate EMI, minimize loop areas of high-current paths, use shielded inductors, and employ proper grounding strategies with a solid ground plane. Selecting low-ESL capacitors and placing them close to pins reduces di/dt noise sources. If regulatory limits are tight (e.g., FCC Part 15 Class B), consider spreading the switching frequency or adding common-mode chokes. Layout remains the most effective tool, as internal frequency modulation or filtering is not available in this topology.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. LT3470AEDDB#TRPBF

Product Attribute
Part Number	LT3470AEDDB#TRMPBF	LT3470AHDDB#TRPBF	LT3470AHDDB#TRPBF	LT3470EDDB#TRMPBF
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Linear Technology	Analog Devices Inc.
Voltage - Input (Max)	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Frequency - Switching	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Series	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Synchronous Rectifier	-	-	-	-
Current - Output	-	-	-	-
Function	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Number of Outputs	-	-	-	-
Output Type	-	Current - Unbuffered	Voltage - Buffered	-
Voltage - Output (Max)	-	-	-	-
Voltage - Output (Min/Fixed)	-	-	-	-
Topology	-	-	-	-
Voltage - Input (Min)	-	-	-	-
Output Configuration	-	-	-	-

LT3470AEDDB#TRPBF Datasheet PDF

Download LT3470AEDDB#TRPBF pdf datasheets and Analog Devices Inc. documentation for LT3470AEDDB#TRPBF - Analog Devices Inc..

Datasheets: Cylindrical Battery Holders.pdf
Environmental Information: Material Declaration LT3470AEDDB#TRPBF.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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