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Analog Devices Inc. LT8620EMSE#TRPBF
- Part No.:
- LT8620EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8620EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
LT8620EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 65V, 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 sensor nodes requiring ultra-low standby power.
For engineers reviewing the LT8620EMSE#TRPBF datasheet, LT8620EMSE#TRPBF pinout, LT8620EMSE#TRPBF application, or LT8620EMSE#TRPBF equivalent, key selection criteria include input voltage range (3.4–65V), ultralow IQ regulation capability, programmable switching frequency (200kHz–2.2MHz), and thermal performance in the exposed-pad MSOP package.
Technical Context
The LT8620EMSE#TRPBF implements peak-current-mode control with internal compensation, enabling fast transient response and stable operation with small external inductors. Its architecture integrates top and bottom NMOS power switches (175mΩ/85mΩ typical RDS(ON)) and supports low-dropout operation down to 250mV at 1A.
Burst Mode® operation maintains output ripple below 10mVP-P while regulating at no load, and the SYNC pin enables synchronization to external clocks or selection of pulse-skipping mode. The EN/UV pin provides accurate 1V threshold shutdown with 40mV hysteresis, and the TR/SS pin delivers programmable soft-start and output tracking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 65V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, FPGAs, and analog front-ends in compact systems. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on IoT sensors. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows optimization between EMI, inductor size, and light-load efficiency. |
| Feedback Reference | 0.970V ±6mV - enables precise output voltage setting with standard resistor dividers and minimal drift over temperature. |
| Minimum On-Time | 30ns - supports high step-down ratios (e.g., 48V→3.3V) at 700kHz without pulse skipping. |
| Thermal Resistance | θJA = 40°C/W, θJC(PAD) = 10°C/W - exposed pad ensures reliable operation up to 125°C junction temperature. |
Pinout & Package
LT8620EMSE#TRPBF is housed in a 16-lead plastic MSOP package with exposed thermal pad (Pin 17), which must be soldered to PCB ground for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 5,6) | Main input supply connection | Supplies internal circuitry and top switch; requires local 1µF ceramic bypass close to pins. |
| SW (Pins 11,12,13) | Switch node | Connects to inductor and BST capacitor; must be minimized in area to reduce EMI and switching losses. |
| BST (Pin 14) | Bootstrap supply | Drives top NMOS gate via 0.1µF ceramic capacitor; critical for high-side switch conduction. |
| INTVCC (Pin 10) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; powers control logic; sourcing shifts to BIAS if VBIAS > 3.1V. |
| BIAS (Pin 9) | Efficiency-optimized bias supply | Connect to VOUT ≥3.3V to reduce VIN current draw and improve full-load efficiency. |
| FB (Pin 8) | Feedback input | Regulated to 0.970V; connects to resistor divider tap; requires 4.7–10pF phase-lead capacitor to VOUT. |
| EN/UV (Pin 4) | Enable and undervoltage lockout | 1.00V rising threshold with 40mV hysteresis; enables VIN monitoring or remote shutdown. |
| PG (Pin 7) | Power good flag | Open-drain output signaling ±9% regulation window and fault conditions; valid above 3.4V VIN. |
| TR/SS (Pin 2) | Soft-start and tracking | 2µA internal pull-up enables capacitor-programmed slew rate; pulled low during fault/shutdown. |
| SYNC (Pin 1) | Frequency synchronization | Accepts external clock (200kHz–2.2MHz) or DC high for pulse-skipping; tie low for Burst Mode®. |
| RT (Pin 3) | Frequency set resistor | Resistor to GND sets fSW; e.g., 60.4kΩ yields 700kHz per datasheet Table 1. |
| GND (Pins 15,16,17) | Power and signal ground | Exposed pad (Pin 17) is GND and mandatory for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode® | 2.5µA input current at no load preserves battery life in always-on applications without sacrificing output ripple (<10mVP-P). |
| Synchronous rectification | Integrated 175mΩ/85mΩ NMOS switches eliminate external diode losses, enabling >94% efficiency at 1A. |
| Programmable frequency & sync | RT resistor sets 200kHz–2.2MHz range; SYNC pin accepts external clocks or selects pulse-skipping for deterministic timing. |
| Robust protection suite | Includes overcurrent limiting (top: 4.1A typ, bottom: 3.9A typ), thermal shutdown, and PG fault reporting for system-level reliability. |
| Low dropout & fast transient response | 250mV dropout at 1A and 30ns min on-time support high-ratio conversion; peak-current-mode control ensures <10µs load-step recovery. |
Applications
| Automotive Infotainment Power Supply | Industrial Sensor Node Regulator |
|---|---|
Use Scenario: Powers DSP, display controller, and CAN transceiver in vehicle head units from 9–16V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter with UVLO, soft-start, and PG signaling for safe system boot. Use Value: 65V absolute max rating withstands load-dump transients; 2.5µA IQ extends backup battery runtime during sleep modes. | Use Scenario: Supplies 3.3V to wireless sensor MCU and RF transceiver in factory-floor condition monitoring nodes. IC Role / Device Role / Timing Role: High-efficiency, low-noise step-down regulator with programmable fSW to avoid sensitive ISM bands. Use Value: Burst Mode® maintains <10mVP-P ripple at µA loads; exposed-pad MSOP ensures reliability in unventilated enclosures. |
| GSM Base Station Bias Supply | Test Equipment Auxiliary Rail |
Use Scenario: Generates clean 5V bias for PA driver stages and ADC references in portable cellular test gear. IC Role / Device Role / Timing Role: Low-EMI synchronous buck with SYNC pin locked to system clock for spectral coherence. Use Value: 30ns min on-time enables 24V→5V conversion at 700kHz; BIAS pin connection reduces thermal stress at full load. | Use Scenario: Provides isolated 3.3V rail for digital logic in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Compact, thermally robust regulator with PG flag for power sequencing and fault logging. Use Value: MSOP package fits dense layouts; ±9% PG window ensures accurate power-good assertion before FPGA configuration. |
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 |
|---|---|---|---|
| LT8640SEMSE#TRPBF | Higher 4A output, 3.4–65V input, 2.5µA IQ, but larger 20-lead MSE package and higher cost. | Required where >2A continuous load or tighter load transient specs exist; not drop-in due to pin count and layout change. | Select when future-proofing for higher current or needing integrated spread-spectrum EMI reduction. |
| MPQ4420AGL-AEC1-Z | Automotive-grade 2A buck (3.3–36V), 17µA IQ, no Burst Mode®, smaller QFN, but lacks SYNC, TR/SS, and PG. | Suitable for cost-sensitive AEC-Q100 applications without advanced sequencing or ultra-low-IQ needs. | Choose only for non-battery-powered automotive modules where 17µA IQ is acceptable and PG/soft-start are omitted. |
Compared with LT8640S and MPQ4420A, the LT8620EMSE#TRPBF offers the optimal balance of ultralow IQ, comprehensive feature set (SYNC, TR/SS, PG), and compact MSOP footprint for space-constrained industrial and automotive designs requiring long standby life.
Availability
LT8620EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and GSM base station bias supplies requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT8620EMSE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT8620 product line was designed for high-input-voltage, ultralow-quiescent-current DC/DC conversion in automotive, industrial, and battery-powered systems where efficiency at light loads and robustness under voltage transients are critical.
FAQ
What is the maximum input voltage rating for the LT8620EMSE#TRPBF?
The LT8620EMSE#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pins. This allows it to safely handle automotive load-dump transients and industrial 48V rail surges. Operation above 65V risks permanent damage; for sustained 48V–60V applications, the device remains fully functional within its 3.4V–65V operating range. The LT8620EMSE#TRPBF's robust input stage and integrated protection ensure reliable performance even under harsh voltage conditions.
Does the LT8620EMSE#TRPBF support output voltage tracking during power-up?
Yes, the LT8620EMSE#TRPBF supports output voltage tracking via the TR/SS pin. When an external voltage ramp is applied to TR/SS (or when a capacitor is used with the internal 2µA pull-up), the FB pin is regulated to match TR/SS until it exceeds 0.97V, enabling controlled ramping of multiple rails. This functionality is confirmed in the Pin Functions section and Typical Performance Characteristic G22. The LT8620EMSE#TRPBF uses this feature to coordinate startup with other regulators in complex power systems.
What is the purpose of the BIAS pin on the LT8620EMSE#TRPBF?
The BIAS pin on the LT8620EMSE#TRPBF allows the internal 3.4V regulator to draw current from VOUT instead of VIN when VBIAS ≥ 3.1V, reducing input supply current and improving full-load efficiency. For 3.3V–25V outputs, BIAS should be tied directly to VOUT. This feature lowers thermal stress on the IC and increases overall system efficiency - especially critical in high-current, high-input-voltage applications. The LT8620EMSE#TRPBF datasheet specifies 7.2mA BIAS current consumption at 1A load and 2MHz switching.
Can the LT8620EMSE#TRPBF be synchronized to an external clock?
Yes, the LT8620EMSE#TRPBF supports external clock synchronization via the SYNC pin. Applying a logic-level clock signal (200kHz–2.2MHz) aligns switching edges to the external source, reducing EMI in noise-sensitive systems. The SYNC pin also accepts DC high for pulse-skipping mode or can be grounded for low-ripple Burst Mode® operation. This flexibility is explicitly documented in the Pin Functions and Applications Information sections. The LT8620EMSE#TRPBF's SYNC capability makes it suitable for time-critical and spectrally constrained applications.
What thermal considerations apply to the LT8620EMSE#TRPBF MSOP package?
The LT8620EMSE#TRPBF uses a 16-lead MSOP with exposed thermal pad (Pin 17), requiring soldering to PCB ground for effective heat dissipation. Its thermal resistance is θJA = 40°C/W and θJC(PAD) = 10°C/W - meaning proper pad connection is essential to maintain junction temperature ≤125°C at full 2A load. Layout guidelines mandate short, wide traces to the pad and adequate copper area. The LT8620EMSE#TRPBF's thermal performance is validated across –40°C to 125°C ambient, making it suitable for sealed industrial enclosures.
LT8620EMSE#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
LT8620EMSE#TRPBF FAQ
1.How can I place an order for LT8620EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8620EMSE#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 LT8620EMSE#TRPBF reliable?
The price and inventory of LT8620EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8620EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8620EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8620EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8620EMSE#TRPBF?
LT8620EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8620EMSE#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 LT8620EMSE#TRPBF?
For technical support, including LT8620EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8620EMSE#TRPBF requirements.
6.How does Aetrix verify that LT8620EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8620EMSE#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 LT8620EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8620EMSE#TRPBF?
All LT8620EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8620EMSE#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 LT8620EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8620EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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