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Analog Devices Inc. LT8620HMSE#PBF
- Part No.:
- LT8620HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8620HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,714
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Product details
Overview
LT8620HMSE#PBF 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 - designed for automotive and industrial power supplies requiring ultra-low standby power and high efficiency across wide load ranges.
For engineers reviewing the LT8620HMSE#PBF datasheet, LT8620HMSE#PBF pinout, LT8620HMSE#PBF application, or LT8620HMSE#PBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world efficiency curves at 3.3V/5V outputs, thermal performance at 150°C junction, and validated alternative options for high-reliability DC/DC conversion.
Technical Context
The LT8620HMSE#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable loop behavior using small external inductors (e.g., 4.7µH). Its 30ns minimum on-time supports high VIN/VOUT ratios - critical for 48V-to-3.3V or 24V-to-5V conversion without external driver stages.
Burst Mode operation maintains output ripple below 10mVP-P while drawing only 2.5µA IQ at no load (12VIN → 3.3VOUT), and the EN/UV pin provides accurate 1.0V threshold with 40mV hysteresis for programmable undervoltage lockout or shutdown. The exposed-pad 16-lead MSOP package achieves θJC(PAD) = 10°C/W for robust thermal management up to 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 65V - supports direct connection to 48V industrial buses, automotive batteries, and PoE++ inputs without pre-regulation. |
| Output Current | 2A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or dual-rail sensor interfaces. |
| Quiescent Current | 2.5µA at no load (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 between EMI filtering size (low fSW) and inductor/capacitor footprint (high fSW). |
| Feedback Reference | 0.970V ±0.006V over –40°C to 150°C - ensures <±1% output voltage accuracy across full automotive temperature range. |
| Minimum On-Time | 30ns - enables 12VIN → 1.0VOUT conversion at 700kHz without pulse-skipping or duty-cycle limitation. |
| Thermal Rating | Junction temperature range: –40°C to 150°C - qualified for under-hood automotive applications and high-ambient industrial controls. |
Pinout & Package
LT8620HMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17), which must be soldered to PCB ground plane to achieve θJC(PAD) = 10°C/W. Package dimensions: 4.0mm × 3.0mm × 0.85mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for top MOSFET gate drive | Requires 0.1µF ceramic capacitor to SW; enables high-side switch operation above VIN. |
| VIN | Main input power supply (dual pins) | Must be tied together and locally bypassed with low-ESR input capacitor; feeds internal circuitry and top switch. |
| EN/UV | Enable and input undervoltage lockout | 1.0V rising threshold with 40mV hysteresis; used to program VIN UVLO or shut down device to 1µA supply current. |
| PG | Power good open-drain flag | Asserts high when VOUT is within ±9% of regulation; valid above 3.4V VIN regardless of EN/UV state. |
| SYNC | External clock synchronization input | Ground for Burst Mode (low IQ); tie to INTVCC or logic high for pulse-skipping; accepts 200kHz–2.2MHz external clocks. |
| INTVCC | Internal 3.4V regulator bypass | Decouple with ≥1µF ceramic cap; supplies internal drivers; draws current from BIAS if VBIAS > 3.1V. |
| TR/SS | Soft-start and output tracking control | 2µA internal pull-up enables capacitor-programmed ramp rate; pulled low via 220Ω FET during fault/shutdown. |
| RT | Switching frequency programming | Resistor to GND sets fSW from 200kHz to 2.2MHz; RT = 60.4kΩ yields 700kHz typical. |
| FB | Feedback voltage sense input | Regulated to 0.970V; connects to resistor divider tap; requires 4.7pF–10pF phase-lead capacitor to VOUT. |
| SW | Power switch node (dual pins) | Connects to inductor and BST capacitor; must be minimized on PCB for low EMI and efficient switching. |
| BIAS | Efficiency-optimized bias supply | Tie to VOUT (≥3.3V) to reduce VIN current draw; lowers total system IQ by sourcing INTVCC from output rail. |
| GND | Power and signal ground | Exposed pad (Pin 17) is GND and must be soldered to PCB ground plane 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 systems without sacrificing output ripple (<10mVP-P). |
| High-VIN capability | 65V absolute max input withstands load dump transients in 24V/48V automotive and industrial systems. |
| Fast transient response | Peak current mode + internal compensation delivers stable regulation with <50µs recovery from 1A→2A load steps. |
| Low dropout operation | 250mV dropout at 1A enables high-efficiency regulation even at low VIN/VOUT ratios (e.g., 5.5V→3.3V). |
| Robust fault handling | Inductor saturation tolerance and cycle-by-cycle current limiting protect during overload and short-circuit conditions. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering 3.3V/1.8V rails for SoC, display interface, and CAN transceivers in head units operating from 9V–16V battery with cold-crank down to 4.5V. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 3.3V @ 2A with Burst Mode IQ <3µA to meet ISO 16750-2 standby requirements. Use Value: Enables >15-year battery-backed memory retention and zero-power wake-on-CAN without external LDO staging. |
Use Scenario: Generating 5V/3.3V supplies for digital I/O, analog front-ends, and communication ICs in DIN-rail mounted controllers exposed to 70°C ambient. IC Role / Device Role / Timing Role: High-reliability step-down converter with 150°C junction rating and internal compensation eliminating loop stability tuning. Use Value: Eliminates need for external compensation components and reduces BOM count while maintaining >92% efficiency at full load. |
| 48V Data Center Subsystem | GSM Base Station RF Power Supply |
|
Use Scenario: Point-of-load conversion from 48V intermediate bus to 12V/5V for fan controllers, sensors, and management ASICs in edge servers. IC Role / Device Role / Timing Role: Wide-input buck regulator supporting 36V–57V input range with 30ns min on-time for direct 48V→12V conversion. Use Value: Avoids two-stage conversion loss, improving subsystem efficiency by 3–5% versus 48V→12V→5V architectures. |
Use Scenario: Providing clean, low-noise 5V supply to PA bias circuits and envelope tracking modulators in macrocell BTS with strict EMI limits. IC Role / Device Role / Timing Role: Low-EMI synchronous buck with programmable fSW (700kHz) and integrated soft-start to minimize inrush and spectral peaks. Use Value: Meets EN 55022 Class B conducted emissions without added ferrite beads or shielding, reducing board area by 25%. |
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, 2.2MHz max fSW, same 65V input, but 3.5µA IQ and QFN-only packaging. | Preferred for higher-current loads (>2A) and space-constrained layouts needing 3mm × 4mm QFN. | Select when output current exceeds 2A or MSOP thermal resistance is insufficient for ambient >85°C. |
| MPQ4420AGL-AEC1-Z | Automotive-grade 2A buck (AEC-Q100 Grade 1), 3.5µA IQ, 4.5V–60V input, but no SYNC or TR/SS pins. | Suitable for cost-sensitive automotive body electronics where Burst Mode and tracking are not required. | Choose when AEC-Q100 qualification is mandatory and feature set can be reduced to basic enable/PG functionality. |
Compared with LT8620HMSE#PBF, LT8640SIV#PBF offers higher current and frequency flexibility at the cost of increased IQ and no MSOP option, while MPQ4420AGL-AEC1-Z provides automotive qualification but omits synchronization and soft-start control - making LT8620HMSE#PBF optimal for thermally demanding, feature-rich industrial designs requiring 150°C operation and precise power sequencing.
Availability
LT8620HMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and 48V data center subsystems requiring stable component supply with guaranteed 150°C junction temperature operation and long-term lifecycle support.
Supply support for LT8620HMSE#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 and maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LT8620 product line delivers ultralow-quiescent-current synchronous buck regulators for harsh-environment applications where extended battery life, wide input range, and high-temperature reliability are non-negotiable design requirements.
FAQ
What is the maximum junction temperature rating for LT8620HMSE#PBF?
The LT8620HMSE#PBF is rated for operation from –40°C to 150°C junction temperature, with full electrical specifications guaranteed across this range. This H-grade qualification makes it suitable for under-hood automotive locations and high-ambient industrial enclosures where standard E- or I-grade parts would derate or fail.
How does LT8620HMSE#PBF achieve 2.5µA quiescent current?
The LT8620HMSE#PBF achieves 2.5µA quiescent current through optimized Burst Mode operation: during light loads, it delivers single current pulses to the output capacitor and then enters deep sleep, disabling all switching and control circuitry except essential bias currents. This architecture minimizes input current while maintaining output ripple below 10mVP-P.
Can LT8620HMSE#PBF synchronize to an external clock?
Yes, LT8620HMSE#PBF supports external clock synchronization via the SYNC pin, accepting frequencies from 200kHz to 2.2MHz. When driven by an external clock, LT8620HMSE#PBF operates in pulse-skipping mode with aligned switching edges - essential for noise-sensitive systems requiring deterministic EMI profiles.
What is the purpose of the BIAS pin on LT8620HMSE#PBF?
The BIAS pin on LT8620HMSE#PBF allows sourcing internal regulator current from the output rail instead of VIN when VBIAS > 3.1V. For 3.3V+ outputs, tying BIAS to VOUT reduces total input current and improves light-load efficiency - a key enabler for high-efficiency 12VIN→3.3VOUT or 24VIN→5VOUT designs.
Does LT8620HMSE#PBF require external compensation components?
No, LT8620HMSE#PBF features fully internal compensation based on peak current mode control, eliminating the need for external Type II or Type III compensation networks. This simplifies layout, reduces BOM count, and guarantees loop stability with standard 4.7µH inductors and ceramic output capacitors.
LT8620HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8620HMSE#PBF FAQ
1.How can I place an order for LT8620HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8620HMSE#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 LT8620HMSE#PBF reliable?
The price and inventory of LT8620HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8620HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8620HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8620HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8620HMSE#PBF?
LT8620HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8620HMSE#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 LT8620HMSE#PBF?
For technical support, including LT8620HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8620HMSE#PBF requirements.
6.How does Aetrix verify that LT8620HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8620HMSE#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 LT8620HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8620HMSE#PBF?
All LT8620HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8620HMSE#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 LT8620HMSE#PBF part is unused and in its original packaging.
Return procedure for LT8620HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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