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Analog Devices Inc. LT8620EMSE#PBF
- Part No.:
- LT8620EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8620EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:429
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Product details
Overview
LT8620EMSE#PBF 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 LT8620EMSE#PBF datasheet, LT8620EMSE#PBF pinout, LT8620EMSE#PBF application, or LT8620EMSE#PBF 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 thermal performance with θJA = 40°C/W in the MSE package.
Technical Context
The LT8620EMSE#PBF 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 optimization for size vs. efficiency across wide input ranges.
Burst Mode® operation delivers ultralow 2.5µA quiescent current while maintaining <10mVP-P output ripple; synchronization via SYNC pin allows external clock alignment or pulse-skipping mode. The EN/UV pin provides accurate 1.0V threshold with 40mV hysteresis for precise undervoltage lockout or shutdown control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 65V - supports direct connection to 48V industrial buses and automotive battery transients without pre-regulation. |
| Output Current | 2A continuous - sufficient for powering dual-core microcontrollers or FPGA I/O banks from single-stage conversion. |
| Quiescent Current | 2.5µA at no load (12VIN→3.3VOUT) - enables >10-year battery life in always-on remote sensors. |
| Feedback Reference | 0.970V ±0.006V - enables accurate 3.3V, 5V, or custom output regulation with 1% resistors. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows trade-off between EMI filtering complexity and inductor size (e.g., 4.7µH at 700kHz). |
| Minimum On-Time | 30ns - supports 12V→1.0V conversion at 700kHz without duty-cycle limitation. |
| Power Good Threshold | ±9% of VFB - provides reliable system reset signaling during brown-out or startup sequencing. |
Pinout & Package
LT8620EMSE#PBF uses a 16-lead plastic MSOP package (MSE) with exposed pad (Pin 17) soldered to PCB ground for low thermal resistance (θJA = 40°C/W, θJC(PAD) = 10°C/W).
| 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 logic high for pulse-skipping; TR/SS controls soft-start ramp rate; RT sets switching frequency; EN/UV enables/disables with 1.0V threshold; dual VIN pins reduce IR drop; NC unconnected; GND is signal and thermal reference. |
| 9–16 | FB, PG, BIAS, INTVCC, BST, SW, SW, SW | FB senses output voltage via divider; PG signals regulation status; BIAS powers internal circuitry from VOUT ≥3.3V to reduce input current; INTVCC is internal 3.4V supply; BST drives high-side switch; three SW pins connect to inductor/boost cap with low-inductance layout priority. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode® | 2.5µA input current at no load preserves battery energy in always-on systems without sacrificing output ripple (<10mVP-P). |
| Synchronous rectification | Integrated top/bottom NMOS switches (175mΩ/85mΩ) eliminate external diode losses and enable >94% efficiency at 1A. |
| Robust protection suite | Thermal shutdown, overcurrent limiting (top: 4.1A typ, bottom: 3.9A typ), and PG fault flag ensure safe operation under overload or short-circuit. |
| Flexible biasing | BIAS pin accepts VOUT ≥3.3V to source internal circuitry, reducing VIN current by up to 7.2mA and improving light-load efficiency. |
| Low-EMI design | Controlled SW edge rates, integrated bootstrap capacitor path, and silent switcher architecture minimize conducted/radiated emissions in noise-sensitive applications. |
Applications
| Automotive Infotainment Power Supply | Industrial Sensor Node DC-DC |
|---|---|
Use Scenario: Powers 3.3V MCU, CAN transceiver, and display backlight from 12V/24V vehicle battery with cold-crank tolerance down to 3.4V. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 3.3V/2A with Burst Mode® for <5µA sleep current during ignition-off. Use Value: Eliminates need for external LDO post-regulator; maintains system wake-up capability for telematics over 10+ years on single CR2032 backup cell. | Use Scenario: Supplies 5V to LoRaWAN radio and temperature/humidity sensor in sealed outdoor enclosure powered by solar-charged LiFePO4. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating from 8–60V PV input, synchronized to MCU-controlled 1MHz clock to avoid RF band interference. Use Value: Achieves 92% efficiency at 100mA load, extending battery life by 3.2× versus legacy controllers; PG flag triggers MCU sleep/wake coordination. |
| GSM Base Station Bias Supply | Programmable Logic Controller (PLC) I/O Module |
Use Scenario: Generates stable 5V rail for GSM power amplifier biasing in remote cellular repeaters exposed to 48V telecom line surges. IC Role / Device Role / Timing Role: Input-protected buck converter with 65V abs max rating and fast 30ns min on-time to maintain regulation during 48V→5V conversion at full load. Use Value: Survives 100V/10ms line transients per IEC 61000-4-5; eliminates external TVS and pre-regulator, reducing BOM cost by $1.80/unit. | Use Scenario: Provides isolated 3.3V logic supply for digital I/O expansion modules in factory automation cabinets with 24V DC field bus. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator in MSOP package mounted directly on I/O board, supporting -40°C to 125°C ambient operation. Use Value: Exposed pad soldering enables 40°C/W thermal resistance, preventing derating at 85°C cabinet temperature; EN/UV pin enables centralized power sequencing with PLC main controller. |
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 |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1A output, 14µA IQ, requires external compensation | Lacks integrated soft-start tracking and PG flag; lower current rating limits use in 2A loads | Select when cost sensitivity outweighs need for 2A output and advanced supervision features |
| MPQ4332GQ-AEC1 | 3.3V–65V input, 2A output, 2.5µA IQ, AEC-Q200 qualified, 12-pin QFN only | Only available in QFN; lacks MSOP option and has different pinout; no BIAS pin for VIN current reduction | Prefer for automotive production where AEC-Q200 compliance is mandatory and board space permits QFN |
Compared with LM5164QPWPRQ1 and MPQ4332GQ-AEC1, LT8620EMSE#PBF uniquely combines 2A capability, 2.5µA IQ, MSOP packaging with exposed pad, and integrated BIAS/PG/TR/SS functionality - making it optimal for space-constrained industrial and automotive designs requiring full feature integration without external components.
Availability
LT8620EMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and GSM base station power supplies requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT8620EMSE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8620 product line delivers high-voltage, ultralow-quiescent-current synchronous buck regulators optimized for battery-powered and energy-harvesting applications where extended runtime and wide input range are critical design requirements.
FAQ
What is the maximum input voltage rating for LT8620EMSE#PBF?
The LT8620EMSE#PBF has an absolute maximum input voltage rating of 65V on the VIN pins, with guaranteed operation from 3.4V to 65V. This enables direct connection to 48V industrial buses and automotive battery systems including cold-crank conditions. Operation above 65V risks permanent damage per Absolute Maximum Ratings table in the official datasheet.
How does LT8620EMSE#PBF achieve 2.5µA quiescent current?
LT8620EMSE#PBF achieves 2.5µA quiescent current through patented Burst Mode® operation: during light loads, it delivers discrete energy packets to the output capacitor followed by deep sleep periods where most internal circuitry is disabled. This reduces input current to 1.7µA in sleep mode, yielding 2.5µA typical total at no load (12VIN→3.3VOUT), as verified in Figure G03 of the LT8620 datasheet.
Can LT8620EMSE#PBF be synchronized to an external clock?
Yes, LT8620EMSE#PBF supports external clock synchronization via the SYNC pin. When driven with a logic-level clock signal (0.8V–1.5V thresholds), the device aligns its switching edges to the external frequency and operates in pulse-skipping mode. This feature enables EMI reduction by shifting switching noise away from sensitive frequency bands - a capability confirmed in the Pin Functions and Applications Information sections of the LT8620 documentation.
What is the purpose of the BIAS pin on LT8620EMSE#PBF?
The BIAS pin on LT8620EMSE#PBF allows the internal regulator to draw current from VOUT (when ≥3.3V) instead of VIN, reducing input supply current by up to 7.2mA. This improves light-load efficiency and lowers thermal stress on the input stage. For LT8620EMSE#PBF applications with 3.3V–25V outputs, tying BIAS to VOUT is recommended per the Applications Information section.
Does LT8620EMSE#PBF include power good indication?
Yes, LT8620EMSE#PBF includes an open-drain Power Good (PG) pin that asserts low until the FB pin voltage reaches within ±9% of the programmed output voltage and remains low during fault conditions (e.g., overcurrent or thermal shutdown). PG is valid when VIN exceeds 3.4V regardless of EN/UV state, providing reliable system monitoring for microcontroller reset sequencing in designs using LT8620EMSE#PBF.
LT8620EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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:
- 16-MSOP-EP
LT8620EMSE#PBF FAQ
1.How can I place an order for LT8620EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8620EMSE#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 LT8620EMSE#PBF reliable?
The price and inventory of LT8620EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8620EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8620EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8620EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8620EMSE#PBF?
LT8620EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8620EMSE#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 LT8620EMSE#PBF?
For technical support, including LT8620EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8620EMSE#PBF requirements.
6.How does Aetrix verify that LT8620EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8620EMSE#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 LT8620EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8620EMSE#PBF?
All LT8620EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8620EMSE#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 LT8620EMSE#PBF part is unused and in its original packaging.
Return procedure for LT8620EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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