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Analog Devices Inc. LT8620IMSE#TRPBF
- Part No.:
- LT8620IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8620IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT8620IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 65V input, 2A synchronous step-down regulator in a thermally enhanced 16-lead MSOP package, featuring 2.5µA quiescent current in Burst Mode®, 94% efficiency at 1A/12VIN→5VOUT, and 30ns minimum on-time for high VIN/VOUT ratios - deployed in automotive infotainment power rails and industrial IoT sensor nodes requiring ultra-low standby power.
For engineers reviewing the LT8620IMSE#TRPBF datasheet, LT8620IMSE#TRPBF pinout, LT8620IMSE#TRPBF application, or LT8620IMSE#TRPBF equivalent, key selection criteria include verified 65V absolute max input rating, confirmed 0.970V feedback reference with ±9% PG threshold, validated 2.5µA no-load IQ at 12VIN→3.3VOUT, and documented 30ns min on-time enabling 48V-to-3.3V conversion at 700kHz without duty-cycle limitation.
Technical Context
The LT8620IMSE#TRPBF implements peak-current-mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its 200kHz–2.2MHz programmable switching frequency (via RT resistor) supports EMI optimization and size reduction across wide input ranges.
It integrates top/bottom NMOS power switches (175mΩ/85mΩ typical RDS(ON)), supports BIAS pin operation for improved light-load efficiency when VOUT ≥ 3.3V, and features low-EMI Silent Switcher®-compatible layout with integrated BST capacitor path and exposed GND pad for thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 65V - enables direct connection to 48V industrial buses or automotive battery without pre-regulation. |
| Output Current | 2A continuous - supports single-rail powering of microcontrollers, FPGAs, or RF transceivers. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - extends battery life in always-on sensor nodes beyond 10 years. |
| Feedback Reference | 0.970V ±0.006V - enables precise output regulation with 1% resistors; sets accuracy floor for VOUT programming. |
| Min On-Time | 30ns - allows 48V-to-3.3V conversion at 700kHz (D ≈ 5%) without pulse-skipping or instability. |
| PG Threshold Accuracy | ±9% of VFB - provides reliable power-good signaling for system sequencing in automotive ECUs. |
| Switching Frequency Range | 200kHz to 2.2MHz - permits EMI band avoidance and compact magnetics selection (e.g., 4.7µH at 700kHz). |
Pinout & Package
LT8620IMSE#TRPBF uses a 16-lead MSOP package (MSE) with exposed thermal pad (Pin 17 = GND). The package has θJA = 40°C/W and requires soldering of the exposed pad to PCB ground plane for thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap Supply | Drives top NMOS gate above VIN; requires 0.1µF ceramic capacitor to SW for proper high-side switching. |
| VIN | Main Input Power | Supplies internal circuitry and top switch; dual pins (1,2) must be shorted and locally bypassed with ≥1µF ceramic. |
| EN/UV | Enable / UVLO Input | 1.0V rising threshold enables shutdown or programmable input undervoltage lockout (e.g., 8V cutoff via resistor divider). |
| PG | Power-Good Flag | Open-drain output asserting low when VOUT deviates >±9% from target or fault occurs; valid above 3.4V VIN. |
| SYNC | Frequency Synchronization | Accepts external clock (200kHz–2.2MHz) or DC high for pulse-skipping; grounded for low-ripple Burst Mode®. |
| TR/SS | Soft-Start / Tracking | Controls output ramp rate via capacitor; also enables voltage tracking during sequencing with external supply. |
| RT | Frequency Set Resistor | Resistor to GND programs switching frequency (e.g., 60.4kΩ → 700kHz); enables EMI tuning and layout optimization. |
| FB | Feedback Input | Senses output via resistor divider; regulated to 0.970V; requires 4.7–10pF phase-lead cap to VOUT for stability. |
| SW | Switch Node | Connects to inductor and BST cap; high di/dt node requiring minimized trace area and tight coupling to GND. |
| INTVCC | Internal Regulator Bypass | 3.4V internal rail; bypass with ≥1µF ceramic to PGND; supplies control logic and drivers; sourced from BIAS if >3.1V. |
| BIAS | Efficiency Boost Supply | When tied to VOUT ≥3.3V, reduces VIN current draw and improves light-load efficiency; bypass required if externally supplied. |
| GND | Power Ground | Reference for all signals; exposed pad (Pin 17) must be soldered to PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 2.5µA IQ in regulation enables >10-year battery life in always-on automotive telematics modules. |
| Low-Ripple Burst Mode® | Maintains <10mVP-P output ripple at µA loads while achieving >85% efficiency at 100µA output current. |
| Fast Minimum On-Time | 30ns on-time supports high-step-down ratios (e.g., 48V→3.3V) at 700kHz without cycle skipping or instability. |
| Integrated Power Switches | 175mΩ top / 85mΩ bottom NMOS reduce conduction loss and eliminate external MOSFET selection and layout complexity. |
| Robust Fault Protection | Thermal shutdown, overcurrent limiting (top: 4.1A typ, bottom: 3.9A typ), and PG flag enable safe operation under overload or short-circuit. |
Applications
| Automotive Infotainment | Industrial Sensor Nodes |
|---|---|
|
Use Scenario: Powering SoC, display controller, and CAN transceiver in head unit with cold-crank (4.5V) to load-dump (60V) conditions. IC Role / Device Role / Timing Role: Primary 5V/2A buck regulator with input overvoltage tolerance and sequenced soft-start for system reset coordination. Use Value: Eliminates need for external TVS and pre-regulator; 65V rating withstands ISO 7637-2 pulses; 2.5µA IQ extends backup battery runtime. |
Use Scenario: Battery-powered wireless vibration sensor operating in remote oil-field equipment with 10-year deployment requirement. IC Role / Device Role / Timing Role: Main system supply converting 3.6V LiSOCl₂ battery to 3.3V for MCU and radio, entering deep sleep between transmissions. Use Value: 2.5µA no-load IQ directly determines battery lifetime; low EMI ensures clean ADC readings; PG flag validates rail before wake-up. |
| GSM Base Station RF Power | Programmable Logic Supply |
|
Use Scenario: Generating 3.3V/2A bias for PA driver stage in outdoor small-cell base station with wide ambient temperature range. IC Role / Device Role / Timing Role: High-efficiency, high-reliability point-of-load converter with thermal derating and robust startup under varying input. Use Value: 92% efficiency at 1A/12V→3.3V reduces heatsink size; -40°C to 125°C rated junction temp ensures field reliability. |
Use Scenario: Supplying configurable I/O banks on FPGA development board where multiple voltage rails must track during power-up. IC Role / Device Role / Timing Role: Adjustable 1.2V–5V output regulator with TR/SS pin enabling precise voltage ramp and external tracking capability. Use Value: TR/SS pin allows synchronization with other rails via DAC or supervisor IC; internal soft-start prevents inrush current damage. |
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 | Higher 4A output, 3.4V–65V input, 2.5µA IQ, but 20-lead QFN only; no MSOP option. | Requires PCB redesign due to different package (QFN vs MSOP) and pinout; larger solution size. | Select when >2A output or lower thermal resistance is required; not drop-in for LT8620IMSE#TRPBF footprint. |
| TPS54260DGQR | 3.5V–60V input, 2.5A, 145µA IQ (Burst Mode), no BIAS pin, 100ns min on-time. | Lacks ultralow IQ and fast min on-time; unsuitable for 48V→3.3V at high frequency or battery-critical apps. | Choose for cost-sensitive industrial supplies where 145µA IQ is acceptable and 48V→3.3V conversion is not required. |
Compared with LT8640SIV#PBF and TPS54260DGQR, the LT8620IMSE#TRPBF uniquely balances 2A capability, 2.5µA IQ, 30ns min on-time, and MSOP packaging - making it optimal for space-constrained, battery-backed, or high-VIN/VOUT-ratio applications where alternatives compromise on at least two of these parameters.
Availability
LT8620IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and GSM RF power supplies requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LT8620IMSE#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 high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LT8620IMSE#TRPBF belongs to the Silent Switcher®-compatible monolithic buck regulator family, designed specifically for noise-sensitive applications in automotive, industrial, and communications infrastructure where low EMI and ultralow quiescent current are mandatory.
FAQ
What is the maximum input voltage rating for the LT8620IMSE#TRPBF?
The LT8620IMSE#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pins, with guaranteed operation from 3.4V to 65V. This allows direct interface with 48V industrial buses and automotive battery systems including load-dump transients. Exceeding 65V may cause permanent damage per Absolute Maximum Ratings.
How does the LT8620IMSE#TRPBF achieve 2.5µA quiescent current?
The LT8620IMSE#TRPBF achieves 2.5µA quiescent current through optimized Burst Mode® operation that shuts down all switching and control circuitry between energy bursts, reducing input current to 1.7µA in deep sleep. Combined with minimal feedback divider current (e.g., 1MΩ/412kΩ), the total no-load IQ reaches 2.5µA at 12VIN→3.3VOUT.
Can the LT8620IMSE#TRPBF operate with a 48V input and 3.3V output at 700kHz?
Yes - the LT8620IMSE#TRPBF supports 48V→3.3V conversion at 700kHz using its 30ns minimum on-time, which enables ~5% duty cycle without pulse-skipping. Verified in Typical Performance Characteristics (Figure G18), this operation maintains regulation and efficiency >85% at light loads with proper inductor (e.g., 4.7µH) and layout.
What is the function of the BIAS pin on the LT8620IMSE#TRPBF?
The BIAS pin on the LT8620IMSE#TRPBF supplies current to internal regulators when tied to VOUT ≥3.3V, reducing VIN current draw and improving light-load efficiency. If unused, it must be tied to GND. When active, it lowers INTVCC sourcing burden from VIN, enabling higher overall efficiency in 3.3V–25V output applications.
Is the LT8620IMSE#TRPBF pin-compatible with other LT86xx devices?
No - the LT8620IMSE#TRPBF has a unique 16-pin MSOP pinout distinct from LT8640S (20-pin QFN) or LT8610 (16-pin MSOP but different pin assignments). Pin compatibility is not claimed in the datasheet; PCB layout must be designed specifically for LT8620IMSE#TRPBF's pin configuration shown in Figure TA01a.
LT8620IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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:
- 16-MSOP-EP
LT8620IMSE#TRPBF FAQ
1.How can I place an order for LT8620IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8620IMSE#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 LT8620IMSE#TRPBF reliable?
The price and inventory of LT8620IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8620IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8620IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8620IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8620IMSE#TRPBF?
LT8620IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8620IMSE#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 LT8620IMSE#TRPBF?
For technical support, including LT8620IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8620IMSE#TRPBF requirements.
6.How does Aetrix verify that LT8620IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8620IMSE#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 LT8620IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8620IMSE#TRPBF?
All LT8620IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8620IMSE#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 LT8620IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8620IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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