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Analog Devices Inc. LT8620EUDD#PBF
- Part No.:
- LT8620EUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LT8620EUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:383
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Product details
Overview
LT8620EUDD#PBF from Analog Devices (formerly Linear Technology) is a 65V input, 2A synchronous step-down regulator in a thermally enhanced 24-lead 3mm × 5mm QFN package, featuring 2.5µA quiescent current in Burst Mode®, 94% peak efficiency at 1A/12VIN→5VOUT, and 30ns minimum on-time for high VIN/VOUT ratios - deployed in automotive infotainment power rails and industrial sensor node supplies.
For engineers reviewing the LT8620EUDD#PBF datasheet, LT8620EUDD#PBF pinout, LT8620EUDD#PBF application, or LT8620EUDD#PBF equivalent, key selection criteria include ultralow IQ regulation down to 100µA load, ±9% power-good accuracy, RT-programmable 200kHz–2.2MHz switching, BIAS-pin efficiency optimization, and thermal performance with exposed pad soldering.
Technical Context
The LT8620EUDD#PBF implements peak-current-mode control with internal compensation, enabling fast transient response and stable loop behavior using small external inductors. Its architecture integrates top and bottom NMOS power switches (175mΩ/85mΩ typical RDS(ON)) and supports low-EMI Silent Switcher-compatible layout via split SW pins and BST capacitor routing.
Burst Mode® operation maintains output ripple below 10mVP-P while regulating at no-load IQ of 2.5µA; synchronization via SYNC pin disables Burst Mode and enables pulse-skipping or external clock alignment up to 2.2MHz. EN/UV pin provides accurate 1.0V threshold with 40mV hysteresis for programmable undervoltage lockout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 65V - supports wide-range industrial and automotive battery inputs including cold-crank and load-dump transients. |
| Output Current | 2A continuous - delivers full rated current with thermal derating managed by exposed-pad QFN package (θJC = 5°C/W). |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on IoT sensors and telematics modules. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows trade-off between inductor size (e.g., 4.7µH @ 700kHz) and light-load efficiency. |
| Feedback Reference | 0.970V ±0.006V - enables precise output voltage setting (e.g., 5.0V via R1=1MΩ/R2=412kΩ) with <0.1% line/load regulation. |
| Power-Good Accuracy | ±9% window around VFB - signals valid regulation or fault (e.g., overcurrent, UVLO) with open-drain PG pin pulled down to ≤0.1V. |
| Min On-Time | 30ns - supports 12V→1.0V conversion at 2MHz without pulse skipping, critical for point-of-load regulation. |
Pinout & Package
LT8620EUDD#PBF is housed in a 24-lead (3mm × 5mm) plastic QFN package with exposed thermal pad (Pin 25 = GND), θJA = 46°C/W, θJC(PAD) = 5°C/W. The exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | SYNC, TR/SS, RT, EN/UV, VIN, VIN, NC, GND | SYNC accepts external clock or DC high for pulse-skipping; TR/SS programs soft-start slew rate; RT sets fSW; EN/UV enables shutdown at 1.0V threshold; dual VIN pins reduce IR drop; NC unconnected. |
| 9–16 | FB, PG, BIAS, INTVCC, BST, SW, SW, SW | FB senses 0.970V reference; PG signals ±9% regulation status; BIAS powers internal circuitry from VOUT ≥3.3V to cut IQ; INTVCC is 3.4V internal rail; BST drives high-side gate; three SW pins parallel switch current paths. |
| 17–24 | GND, NC, NC, NC, GND, NC, NC, NC | Multiple GND pins and dedicated ground-return paths minimize noise coupling; NC pins are internally unconnected and must remain floating or grounded per layout guidelines. |
| 25 | Exposed Pad | Thermal and electrical GND connection - requires solid solder mask-defined thermal via array to inner ground plane for θJC = 5°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode® | 2.5µA input current at no load preserves battery capacity in always-on systems without sacrificing <10mVP-P output ripple. |
| Synchronous 2A Operation | Integrated 175mΩ/85mΩ NMOS switches eliminate external diode losses, enabling 94% efficiency at 1A/12V→5V and reducing solution footprint. |
| 30ns Minimum On-Time | Enables high-step-down ratios (e.g., 48V→3.3V @ 2MHz) without frequency foldback, maintaining regulated output under wide VIN transients. |
| BIAS Pin Efficiency Boost | When tied to VOUT ≥3.3V, internal regulators draw from BIAS instead of VIN, cutting total system IQ by up to 40% in intermediate-output applications. |
| Robust Fault Protection | Includes thermal shutdown, input UVLO (3.4V), PG flag for ±9% output deviation, and safe inductor saturation tolerance during overload or short-circuit events. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering DSPs, display controllers, and CAN transceivers in head units with 9V–16V battery input and cold-crank down to 4.5V. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter delivering 2A with Burst Mode® IQ <3µA to extend backup battery life during ignition-off state. Use Value: Maintains system RTC and memory retention for >10 years on coin-cell backup while surviving 65V load-dump transients. | Use Scenario: Providing regulated 3.3V for LoRaWAN edge nodes powered by primary lithium thionyl chloride cells (3.6V nominal, 20-year shelf life). IC Role / Device Role / Timing Role: Always-on step-down regulator operating in Burst Mode® with 2.5µA IQ, enabling multi-year field deployment without maintenance. Use Value: Eliminates need for external LDO post-regulation, reduces bill-of-materials, and avoids efficiency penalty of cascaded conversion stages. |
| GSM Baseband Power Supply | Programmable Logic Controller (PLC) I/O Module |
Use Scenario: Generating clean 1.8V/2.5V core voltages for GSM/GPRS modems subject to pulsed 2A transmit current demands and 12V vehicle supply. IC Role / Device Role / Timing Role: High-transient-response buck converter using peak-current-mode control and 30ns min on-time to maintain regulation during 10A/ms load steps. Use Value: Prevents modem reset during RF transmission bursts by limiting output droop to <2% with 47µF ceramic output capacitance. | Use Scenario: Converting 24VDC field bus to isolated 5V logic rails in modular PLC backplanes with strict EMI limits and -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Non-isolated 5V/2A supply with SYNC pin synchronized to system clock to suppress switching noise in analog measurement circuits. Use Value: Reduces conducted EMI by >15dB through deterministic switching edge placement, easing CISPR 11 Class A compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640SIV#PBF | 4A output, 3.4V–65V input, 2.5µA IQ, same 3×5mm QFN but 28-lead; includes spread-spectrum modulation. | Higher current capability and integrated spread-spectrum EMI reduction - suited for noise-sensitive analog front-ends. | Select when >2A load or stricter EMI requirements exist; pinout differs (no NC pins, added SS pin), requiring PCB redesign. |
| MPQ4420AGL-AEC1-Z | 2A, 3.3V–65V, 17µA IQ, AEC-Q100 Grade 1, 16-pin QFN; lacks BIAS pin and programmable fSW. | Automotive-qualified with extended temperature range (-40°C to +125°C junction), but higher IQ limits battery-life applications. | Choose for production automotive ECUs where AEC-Q100 qualification is mandatory and ultralow IQ is secondary. |
Compared with LT8620EUDD#PBF, LT8640SIV#PBF offers higher current and EMI features at the cost of pinout compatibility, while MPQ4420AGL-AEC1-Z provides automotive qualification but sacrifices 7× higher quiescent current - making LT8620EUDD#PBF optimal for space-constrained, battery-sensitive industrial and telematics designs.
Availability
LT8620EUDD#PBF is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor node supplies, and GSM baseband power applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8620EUDD#PBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT8620EUDD#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC regulators, engineered specifically for ultralow-quiescent-current operation in battery-powered and automotive systems where reliability under wide input transients is critical.
FAQ
What is the maximum input voltage rating for the LT8620EUDD#PBF?
The LT8620EUDD#PBF has an absolute maximum input voltage rating of 65V on the VIN pins. This allows direct connection to 48V industrial buses and automotive systems experiencing load-dump transients. Operation above 3.4V is required for regulation; sustained operation near 65V requires thermal design attention due to power dissipation in the internal MOSFETs. The LT8620EUDD#PBF includes input UVLO that disables switching below 3.4V to prevent erratic behavior.
How does the BIAS pin improve efficiency in the LT8620EUDD#PBF?
The BIAS pin on the LT8620EUDD#PBF allows the internal 3.4V regulator to draw current from VOUT (when ≥3.3V) instead of VIN, reducing total input quiescent current by up to 40%. For example, in a 5V-output application, connecting BIAS to VOUT lowers system IQ from ~2.5µA to ~1.5µA. This feature is critical for extending battery life in always-on devices. The LT8620EUDD#PBF datasheet specifies BIAS current consumption of 7.2mA at 1A load and 2MHz switching.
Can the LT8620EUDD#PBF synchronize to an external clock, and what are the voltage thresholds?
Yes, the LT8620EUDD#PBF supports external clock synchronization via the SYNC pin. The falling threshold is 1.0V and rising threshold is 1.2V, with hysteresis ensuring noise immunity. When driven by a logic-high signal (>3V) or INTVCC, the device enters pulse-skipping mode; applying a square wave enables deterministic edge alignment. The LT8620EUDD#PBF maintains synchronization across its full 200kHz–2.2MHz range, and SYNC pin current is limited to ±100nA to minimize driver loading.
What is the purpose of the three SW pins on the LT8620EUDD#PBF package?
The LT8620EUDD#PBF features three paralleled SW pins (Pins 16, 17, and 18) to reduce conduction losses and thermal resistance in the high-current switch node path. Each SW pin carries portion of the 2A peak inductor current, lowering effective RDS(ON) contribution and improving thermal spreading to the PCB. Layout best practices require tying all three SW pins together with minimal-length copper and connecting them directly to both the inductor and BST capacitor - a key factor in achieving the specified θJC = 5°C/W in the LT8620EUDD#PBF QFN package.
Does the LT8620EUDD#PBF support output voltage tracking during startup?
Yes, the LT8620EUDD#PBF supports output voltage tracking via the TR/SS pin. When a voltage ramp is applied to TR/SS (e.g., from an external DAC or RC network), the FB pin is servoed to match it until TR/SS exceeds 0.97V, after which regulation transitions to the internal 0.970V reference. This enables controlled power sequencing in multi-rail systems. The LT8620EUDD#PBF provides a 2µA internal pull-up current on TR/SS, allowing simple capacitor-based soft-start with programmable slew rate - a feature confirmed in the device's Electrical Characteristics table.
LT8620EUDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 64.75V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3x5)
LT8620EUDD#PBF FAQ
1.How can I place an order for LT8620EUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8620EUDD#PBF 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 LT8620EUDD#PBF reliable?
The price and inventory of LT8620EUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8620EUDD#PBF is usually 5 days.
3.What payment methods are accepted for LT8620EUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8620EUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8620EUDD#PBF?
LT8620EUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8620EUDD#PBF 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 LT8620EUDD#PBF?
For technical support, including LT8620EUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8620EUDD#PBF requirements.
6.How does Aetrix verify that LT8620EUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8620EUDD#PBF 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 LT8620EUDD#PBF meets industry standards.
7.What is the process for return or replacement of LT8620EUDD#PBF?
All LT8620EUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8620EUDD#PBF, 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 LT8620EUDD#PBF part is unused and in its original packaging.
Return procedure for LT8620EUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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