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Analog Devices Inc. LT8620EUDD#TRPBF
- Part No.:
- LT8620EUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LT8620EUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,634
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Product details
Overview
LT8620EUDD#TRPBF from Analog Devices (formerly Linear Technology) is a 65V input, 2A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode operation, 30ns minimum on-time, and internal compensation. It delivers regulated 5V/2A output from 12V input at 94% efficiency and supports adjustable switching frequency from 200kHz to 2.2MHz via RT pin. Used in automotive infotainment power supplies requiring ultra-low standby power.
For engineers reviewing the LT8620EUDD#TRPBF datasheet, LT8620EUDD#TRPBF pinout, LT8620EUDD#TRPBF application, or LT8620EUDD#TRPBF equivalent, key selection criteria include ultralow IQ regulation at 3.3V/5V outputs, 65V absolute max input tolerance, thermal performance in 3mm × 5mm QFN, and compatibility with BIAS pin biasing for enhanced light-load efficiency.
Technical Context
The LT8620EUDD#TRPBF implements peak-current-mode control with internal 0.97V reference and fixed-frequency PWM architecture. Its 30ns minimum on-time enables high VIN/VOUT ratios (e.g., 48V→3.3V), while fast transient response stems from internal compensation and 2.5µA quiescent current in Burst Mode.
It integrates top and bottom NMOS power switches (175mΩ/85mΩ typical RDS(ON)), supports external synchronization via SYNC pin, and features PG flag with ±9% output voltage monitoring. The BIAS pin allows sourcing internal circuitry current from VOUT ≥3.3V, reducing VIN supply current under light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 65V - supports wide industrial and automotive battery inputs including cold-crank and load-dump conditions. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in compact systems. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on IoT nodes and telematics modules. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows optimization of inductor size vs. efficiency across 12V/24V/48V rails. |
| Feedback Reference | 0.970V ±0.006V - enables precise output regulation with 1% resistors; line/load regulation <0.02%/V and <±0.15%. |
| Minimum On-Time | 30ns - supports high step-down ratios (e.g., 48V→3.3V at 700kHz) without pulse-skipping instability. |
| Package | 24-lead 3mm × 5mm QFN with exposed pad - provides θJC(PAD) = 5°C/W for high-power-density thermal management. |
Pinout & Package
LT8620EUDD#TRPBF is housed in a thermally enhanced 24-lead (3mm × 5mm) plastic QFN package with exposed GND pad (Pin 25) that must be soldered to PCB for thermal and electrical integrity. θJA = 46°C/W, θJC(PAD) = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–2, 13–14, 17, 25 | GND | Power ground return path; Pin 25 is exposed thermal pad tied to system GND plane for low-impedance heat dissipation. |
| 3–4, 11–12 | VIN | Main input supply pins; must be shorted together and bypassed locally with ≥1µF ceramic capacitor near package. |
| 5 | EN/UV | Enable/undervoltage lockout input with 1.00V rising threshold; used to program VIN UVLO or shut down device to 1µA IQ. |
| 6 | SYNC | External clock sync input; tie low for Burst Mode (low IQ), high or AC-coupled for pulse-skipping mode (fixed-frequency alignment). |
| 7 | TR/SS | Soft-start and tracking pin; internal 2µA pull-up enables capacitor-programmed VOUT ramp rate; pulled low during fault/shutdown. |
| 8 | RT | Resistor-to-ground sets switching frequency from 200kHz to 2.2MHz; RT = 60.4kΩ yields 700kHz typical. |
| 9–10 | FB | Feedback input referenced to 0.970V; connects to resistor divider tap; requires 4.7–10pF phase-lead capacitor to VOUT for stability. |
| 15–16 | PG | Open-drain power-good flag; asserts high when VOUT is within ±9% of target and no fault (e.g., overtemp, undervoltage). |
| 18–19 | BIAS | Bias supply input; sources INTVCC current when ≥3.1V applied (e.g., tied to VOUT ≥3.3V), reducing VIN current draw. |
| 20–21 | INTVCC | Internal 3.4V regulator output; bypass with ≥1µF ceramic cap; supplies gate drivers and control logic; not for external loading. |
| 22–23 | BST | Bootstrap supply for top switch gate drive; requires 0.1µF ceramic capacitor placed directly between BST and SW pins. |
| 24 | SW | Switch node connecting internal top/bottom FETs to external inductor and boost capacitor; must be minimized in PCB layout for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 2.5µA IQ regulating 12VIN→3.3VOUT - extends battery runtime in always-on automotive ECUs and remote sensors. |
| Low-Ripple Burst Mode | Output ripple <10mVP-P at light loads - eliminates need for post-regulation LDOs in noise-sensitive analog signal chains. |
| Synchronous Operation | 94% efficiency at 1A, 12VIN→5VOUT - reduces thermal stress and enables smaller heatsinks in enclosed enclosures. |
| Fast Minimum On-Time | 30ns - supports high VIN/VOUT conversion (e.g., 48V→3.3V) without frequency foldback or duty-cycle limitation. |
| Robust Protection Suite | Thermal shutdown, PG fault reporting, and safe inductor saturation tolerance - simplifies design-in for harsh-environment applications. |
| Flexible Biasing | BIAS pin accepts VOUT ≥3.3V - lowers total system IQ by shifting INTVCC current source from VIN to regulated output rail. |
Applications
| Automotive Infotainment Power Supply | Industrial IoT Sensor Node |
|---|---|
|
Use Scenario: Powers DSP, display controller, and CAN transceiver in head unit with 12V/24V battery input and cold-crank survival requirement. IC Role / Device Role / Timing Role: Primary 5V/2A buck regulator delivering stable rail with <10mVP-P ripple during Burst Mode sleep cycles. Use Value: 2.5µA IQ enables >15-year battery-backed memory retention; 65V abs max rating withstands 40V load-dump transients. |
Use Scenario: Supplies 3.3V to ultra-low-power MCU, LoRaWAN radio, and environmental sensors in solar-powered field gateway. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating in Burst Mode during sensor sleep intervals (10µA average load). Use Value: 92% efficiency at 1A and 2.5µA no-load IQ maximize energy harvesting yield; 30ns on-time supports 48V→3.3V direct conversion. |
| GSM Base Station RF Power Amplifier Bias | Programmable Logic Controller (PLC) I/O Module |
|
Use Scenario: Generates clean 5V bias for GaN RF PA stages in small-cell base stations with strict EMI limits and wide input range. IC Role / Device Role / Timing Role: Synchronous buck with low EMI due to controlled edge rates and integrated power switches. Use Value: Adjustable 200kHz–2.2MHz switching avoids sensitive IF bands; BIAS pin connection to VOUT reduces conducted noise on VIN rail. |
Use Scenario: Provides isolated 5V/2A auxiliary supply for digital I/O conditioning circuits in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Main DC/DC converter accepting 24VDC industrial bus with robust EN/UV programmable UVLO. Use Value: ±9% PG flag enables system-level fault detection; 24-lead QFN package fits tight board space while maintaining 125°C junction rating. |
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 |
|---|---|---|---|
| LM5164QWRXMRQ1 | 4.5V–65V input, 1A output, 15µA IQ, requires external compensation | Lacks integrated soft-start, lower current rating, higher IQ compromises battery life | Choose for AEC-Q100 automotive qualification where 1A suffices and cost sensitivity outweighs IQ requirements |
| MPQ4420AGL-A | 3.3V–65V input, 2A output, 25µA IQ, 200kHz–2.5MHz sync-capable | Higher IQ increases no-load power; no BIAS pin support limits efficiency optimization at light loads | Prefer when footprint compatibility with MPQ4420 series is required and 25µA IQ is acceptable for system standby budget |
Compared with LM5164QWRXMRQ1 and MPQ4420AGL-A, the LT8620EUDD#TRPBF delivers superior light-load efficiency (2.5µA vs. 15–25µA), integrated soft-start/tracking, and BIAS pin flexibility-making it optimal for battery-critical and thermally constrained designs despite lacking AEC-Q100 certification.
Availability
LT8620EUDD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial IoT sensor nodes, and GSM base station RF biasing requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature.
Supply support for LT8620EUDD#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 and maintains its legacy of high-performance power management ICs with rigorous characterization and automotive-grade reliability standards.
The LT8620EUDD#TRPBF belongs to the LT86xx family of high-input-voltage synchronous buck regulators designed for demanding applications in automotive, industrial, and communications infrastructure where ultralow quiescent current and wide VIN range are critical.
FAQ
What is the maximum input voltage rating for the LT8620EUDD#TRPBF?
The LT8620EUDD#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pins. This allows reliable operation in 48V industrial systems and automotive environments subject to load-dump transients up to 60V. Continuous operation above 65V may cause permanent damage; design margin should maintain VIN ≤60V under worst-case conditions. The LT8620EUDD#TRPBF also features built-in VIN UVLO with programmable threshold via EN/UV pin.
How does the BIAS pin improve efficiency in the LT8620EUDD#TRPBF?
The BIAS pin on the LT8620EUDD#TRPBF allows internal circuitry (including gate drivers and control logic) to draw current from a regulated output rail ≥3.3V instead of VIN, reducing input supply current-especially beneficial at light loads. When BIAS is tied to VOUT, INTVCC current shifts from VIN, lowering total system IQ. For example, in a 5V-output application, this can reduce no-load input current by ~1.5µA compared to VIN-only biasing. The LT8620EUDD#TRPBF datasheet specifies BIAS current consumption of 7.2mA at 3.3V with 2MHz switching.
Can the LT8620EUDD#TRPBF operate in Burst Mode and still meet EMI requirements?
Yes, the LT8620EUDD#TRPBF supports low-ripple Burst Mode operation with output voltage ripple <10mVP-P, making it suitable for EMI-sensitive applications like RF front-ends and precision analog circuits. Its controlled burst pulses, fast 30ns minimum on-time, and integrated power switches minimize high-frequency harmonics. Layout best practices-including tight SW loop, proper BST capacitor placement, and GND pad soldering-are essential to achieve CISPR 25 Class 5 compliance. The LT8620EUDD#TRPBF evaluation board demonstrates <10mVP-P ripple at 10mA load in Burst Mode.
What is the purpose of the TR/SS pin on the LT8620EUDD#TRPBF?
The TR/SS (Track/Soft-Start) pin on the LT8620EUDD#TRPBF serves dual functions: it programs output voltage ramp rate during startup via an external capacitor, and enables output voltage tracking in multi-rail systems. An internal 2µA current source charges the capacitor, setting slew rate; during faults or shutdown, an internal 220Ω MOSFET pulls TR/SS to GND. If tracking is unused, TR/SS may be left floating. The LT8620EUDD#TRPBF's TR/SS pin also disables tracking when voltage exceeds 0.97V, reverting to internal 0.970V reference regulation.
Does the LT8620EUDD#TRPBF require external compensation components?
No, the LT8620EUDD#TRPBF features fully internal compensation using peak-current-mode control architecture, eliminating the need for external compensation networks. This simplifies design, reduces BOM count, and ensures stable operation across all supported input/output combinations and inductor values. The internal compensation is optimized for use with standard 4.7µH inductors and 47µF output capacitors, as validated in the LT8620EUDD#TRPBF typical application circuit. No external RC networks or type-II/type-III compensators are required.
LT8620EUDD#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):
- 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#TRPBF FAQ
1.How can I place an order for LT8620EUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8620EUDD#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 LT8620EUDD#TRPBF reliable?
The price and inventory of LT8620EUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8620EUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8620EUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8620EUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8620EUDD#TRPBF?
LT8620EUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8620EUDD#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 LT8620EUDD#TRPBF?
For technical support, including LT8620EUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8620EUDD#TRPBF requirements.
6.How does Aetrix verify that LT8620EUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8620EUDD#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 LT8620EUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8620EUDD#TRPBF?
All LT8620EUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8620EUDD#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 LT8620EUDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8620EUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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