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Analog Devices Inc. LT8620IMSE#PBF
- Part No.:
- LT8620IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8620IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:894
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Product details
Overview
LT8620IMSE#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% peak efficiency at 1A/12VIN→5VOUT, and 30ns minimum on-time for high VIN/VOUT ratios - deployed in automotive infotainment power supplies requiring ultra-low standby consumption.
For engineers reviewing the LT8620IMSE#PBF datasheet, LT8620IMSE#PBF pinout, LT8620IMSE#PBF application, or LT8620IMSE#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 under 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#PBF implements peak-current-mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its architecture integrates top and bottom NMOS power switches (175mΩ/85mΩ typical RDS(ON)) and supports programmable switching frequency from 200kHz to 2.2MHz via an external RT resistor.
Burst Mode® operation delivers regulated output with <10mVP-P ripple while maintaining 2.5µA input quiescent current; synchronization capability (SYNC pin) allows alignment to external clocks up to 2.2MHz, and EN/UV pin provides accurate 1.0V threshold with 40mV hysteresis for programmable undervoltage lockout or shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 65V - supports direct connection to 48V industrial rails 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 12VIN→3.3VOUT - enables >10-year battery life in always-on telematics modules |
| Feedback Reference | 0.970V ±0.006V - enables precise 3.3V/5V/12V outputs with ≤1% total error using 1% resistors |
| Min On-Time | 30ns - allows 48V-to-3.3V conversion at 700kHz (D ≈ 7%) without pulse-skipping or instability |
| Efficiency @1A | 94% at 12VIN→5VOUT - reduces thermal load by 350mW vs. 88% alternative, easing heatsink requirements |
| PG Accuracy | ±9% of VFB - provides reliable power-good signaling for SoC reset sequencing with margin against line/load variation |
Pinout & Package
LT8620IMSE#PBF uses a 16-lead MSOP package with exposed thermal pad (Pin 17 = GND), θJA = 40°C/W, requiring soldering of the exposed pad to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 5,6) | Main input power supply | Dual pins reduce IR drop and thermal stress; must be tied together and bypassed locally with ≥1µF ceramic |
| SW (Pins 13,14,15) | Switch node | Connects to inductor and BST capacitor; requires minimal PCB area to suppress EMI and voltage spikes |
| EN/UV | Enable and input UVLO control | 1.0V rising threshold enables precise brown-in/out control; resistor divider from VIN sets custom UVLO point |
| FB | Feedback sensing input | Regulates to 0.970V; connects to resistor divider tap; requires 4.7–10pF phase-lead cap to VOUT for stability |
| PG | Power-good open-drain flag | Pulls low when VOUT deviates >±9% from target or fault occurs; valid above 3.4V VIN regardless of EN state |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up enables capacitor-programmed slew rate; pulled to GND via 220Ω during fault/shutdown |
| RT | Frequency programming | Resistor to GND sets fSW from 200kHz–2.2MHz; RT = 60.4kΩ yields 700kHz per datasheet Table 1 |
| BST | Bootstrap drive supply | Requires 0.1µF ceramic capacitor to SW; enables high-side NMOS gate drive above VIN |
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 regulation accuracy |
| Synchronous rectification | Integrated 175mΩ/85mΩ NMOS switches eliminate external diode losses, enabling >92% efficiency at 3.3V output |
| Low EMI Silent Switcher® topology | Controlled SW node rise/fall times and symmetrical layout minimize radiated emissions for automotive CISPR-25 compliance |
| Robust overload protection | Tolerates inductor saturation during overloads; bottom switch current limit (2.9–4.7A) prevents thermal runaway under short-circuit |
| Flexible start-up control | TR/SS pin enables soft-start ramp rate adjustment and output voltage tracking for multi-rail sequencing |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering DSP, display controller, and CAN transceiver from 12V vehicle battery with cold-crank tolerance down to 3.4V. IC Role / Device Role / Timing Role: Primary 5V/2A buck converter delivering regulated rail with <10mVP-P ripple during Burst Mode® sleep cycles. Use Value: 2.5µA quiescent current extends battery life during vehicle off-state; 65V abs max rating survives load-dump transients. | Use Scenario: Providing 3.3V supply to LoRaWAN sensor node operating on primary lithium thionyl chloride cell. IC Role / Device Role / Timing Role: High-efficiency step-down regulator enabling >15-year field lifetime via ultralow IQ and optimized light-load efficiency. Use Value: Confirmed 2.5µA no-load IQ at 3.3VOUT minimizes self-discharge; 30ns min on-time supports wide input range as battery depletes. |
| GSM Base Station Bias Supply | Medical Point-of-Care Instrument |
Use Scenario: Generating 5V bias for RF power amplifier stages in compact macrocell BTS units with strict thermal constraints. IC Role / Device Role / Timing Role: Compact 16-lead MSOP buck converter delivering 2A with integrated FETs and exposed thermal pad for conduction cooling. Use Value: 40°C/W θJA and GND-exposed pad enable 2A operation without heatsink; 94% efficiency reduces thermal density in dense PCB layouts. | Use Scenario: Powering ARM Cortex-M7 MCU, ADC, and OLED display in portable diagnostic device requiring FDA-compliant low-noise operation. IC Role / Device Role / Timing Role: Low-ripple synchronous buck regulator with PG flag for system-level power sequencing and fault detection. Use Value: ±9% PG threshold ensures reliable SoC reset assertion; <10mVP-P ripple meets analog front-end noise requirements. |
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 | 4.5–65V input, 1A output, 14µA IQ, no integrated bottom FET - requires external sync rectifier | Lacks integrated synchronous rectification; lower output current limits use in 2A applications | Select only if BOM cost reduction outweighs efficiency loss and board space increase from external MOSFET |
| MPQ4420AGL-A | 3.3–65V input, 2A output, 25µA IQ, 100ns min on-time - higher IQ, longer min on-time limits 48V-to-3.3V feasibility | Cannot achieve 700kHz 48V→3.3V conversion due to 100ns min on-time vs. LT8620IMSE#PBF's 30ns | Prefer LT8620IMSE#PBF where high VIN/VOUT ratio and ultralow IQ are mandatory |
Compared with LM5164QPWPRQ1 and MPQ4420AGL-A, the LT8620IMSE#PBF uniquely combines 2.5µA IQ, 30ns min on-time, and fully integrated 2A synchronous switches - making it the only option capable of 48V-to-3.3V/2A conversion with sub-3µA standby current and no external FETs.
Availability
LT8620IMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and medical point-of-care instruments requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT8620IMSE#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing 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 reliability under voltage transients and multi-year standby operation are critical.
FAQ
What is the absolute maximum input voltage rating for the LT8620IMSE#PBF?
The LT8620IMSE#PBF has an absolute maximum input voltage rating of 65V on the VIN pins, as specified in the Absolute Maximum Ratings table. This rating allows direct interface with 48V industrial buses and survival through automotive load-dump transients. Operation above 65V risks permanent damage; derating is recommended for long-term reliability at elevated temperatures.
Does the LT8620IMSE#PBF require an external bootstrap capacitor, and what value is recommended?
Yes, the LT8620IMSE#PBF requires a 0.1µF ceramic capacitor between BST and SW pins to provide gate drive voltage for the high-side NMOS switch. This capacitor must be placed as close as possible to the IC with short, low-inductance traces. X7R or C0G dielectrics are recommended for stable capacitance across temperature and voltage.
How does the LT8620IMSE#PBF achieve 2.5µA quiescent current, and under what conditions is this value guaranteed?
The LT8620IMSE#PBF achieves 2.5µA quiescent current through patented Burst Mode® operation that shuts down all control circuitry between output pulses. This value is guaranteed at 12VIN→3.3VOUT with no load, SYNC pin grounded, and ambient temperature of 25°C. At other voltages or temperatures, IQ increases slightly but remains below 5µA across the full –40°C to 125°C range.
Can the LT8620IMSE#PBF be synchronized to an external clock, and what are the voltage thresholds for the SYNC pin?
Yes, the LT8620IMSE#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. A logic-high signal (>3V) or connection to INTVCC enables pulse-skipping mode; applying a clean square wave up to 2.2MHz aligns switching edges to the external clock source.
What is the purpose of the TR/SS pin on the LT8620IMSE#PBF, and how is it used for soft-start?
The TR/SS pin on the LT8620IMSE#PBF serves dual functions: soft-start ramp control and output voltage tracking. For soft-start, a capacitor from TR/SS to GND creates a linear voltage ramp; the internal 2µA current source charges it, setting output slew rate. For tracking, an external voltage applied to TR/SS forces regulation to match that voltage until it exceeds 0.97V, enabling coordinated power-up of multiple rails.
LT8620IMSE#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
LT8620IMSE#PBF FAQ
1.How can I place an order for LT8620IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8620IMSE#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 LT8620IMSE#PBF reliable?
The price and inventory of LT8620IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8620IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8620IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8620IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8620IMSE#PBF?
LT8620IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8620IMSE#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 LT8620IMSE#PBF?
For technical support, including LT8620IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8620IMSE#PBF requirements.
6.How does Aetrix verify that LT8620IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8620IMSE#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 LT8620IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8620IMSE#PBF?
All LT8620IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8620IMSE#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 LT8620IMSE#PBF part is unused and in its original packaging.
Return procedure for LT8620IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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