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Analog Devices Inc. LT8620HMSE#TRPBF
- Part No.:
- LT8620HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8620HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,774
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Product details
Overview
LT8620HMSE#TRPBF 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 for fast transient response. It delivers regulated 5V/2A output in compact MSOP-16 package and is designed for automotive and industrial power supplies where ultra-low standby power and wide VIN range are critical.
For engineers reviewing the LT8620HMSE#TRPBF datasheet, LT8620HMSE#TRPBF pinout, LT8620HMSE#TRPBF application, or LT8620HMSE#TRPBF equivalent, this page provides verified technical context, real-world performance boundaries, thermal design guidance for 150°C junction operation, and validated alternative options for high-reliability DC/DC conversion.
Technical Context
The LT8620HMSE#TRPBF implements peak-current-mode control with internal 0.97V reference and programmable switching frequency (200kHz–2.2MHz via RT resistor). Its 30ns minimum on-time enables high VIN-to-VOUT ratios (e.g., 48V→3.3V), while low dropout (250mV @1A) supports operation near input limits.
Burst Mode operation maintains <10mVP-P output ripple at light loads with only 2.5µA IQ, and the EN/UV pin features 1V threshold with 40mV hysteresis for precise undervoltage lockout. The PG flag asserts when VOUT is within ±9% of regulation and signals fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 65V - supports 12V, 24V, 48V industrial and automotive rails without pre-regulation. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in harsh environments. |
| Quiescent Current | 2.5µA @ 12VIN→3.3VOUT - enables >10-year battery life in always-on IoT nodes and telematics modules. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT pin; 700kHz typical for optimal EMI/efficiency trade-off with 4.7µH inductor. |
| Efficiency | 94% @ 1A, 12VIN→5VOUT - reduces thermal load in sealed enclosures and enables smaller heatsinks. |
| Thermal Rating | −40°C to +150°C junction - qualified for under-hood automotive and high-temperature industrial applications. |
| Minimum On-Time | 30ns - allows direct 48V-to-3.3V conversion without intermediate stages, saving board space and cost. |
| Feedback Reference | 0.970V ±0.006V - enables accurate output programming with standard 1% resistors and tight line/load regulation. |
Pinout & Package
LT8620HMSE#TRPBF uses a thermally enhanced 16-lead MSOP package (MSE) with exposed pad (Pin 17) soldered to PCB ground for 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 ≥1µF ceramic; connects to input capacitor positive terminal. |
| EN/UV | Enable and input undervoltage lockout input | 1.00V rising threshold with 40mV hysteresis; programs shutdown or UVLO using external resistor divider. |
| PG | Power good open-drain flag | Asserts high when VOUT is within ±9% of target; valid above 3.4V VIN regardless of EN/UV state. |
| SYNC | External clock synchronization input | Ground for Burst Mode; 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 to GND; powers internal circuitry; draws current from BIAS if VBIAS > 3.1V. |
| TR/SS | Soft-start and output voltage tracking | 2µA internal pull-up enables capacitor-programmed ramp rate; pulled low via 220Ω during fault/shutdown. |
| RT | Switching frequency programming | Resistor to GND sets fSW from 200kHz–2.2MHz; e.g., 60.4kΩ yields 700kHz typical. |
| FB | Feedback input referenced to 0.970V | Connect resistor divider tap here; add 4.7–10pF phase-lead cap from FB to VOUT for stability. |
| SW | Switch node (dual pins) | Connects to inductor and BST capacitor; must be minimized on PCB to reduce EMI and switching losses. |
| BIAS | Efficiency-optimized bias supply input | Tie to VOUT ≥3.3V to reduce VIN current draw; improves light-load efficiency and thermal performance. |
| GND | Power and signal ground (exposed pad) | Exposed pad (Pin 17) is GND and must be soldered to PCB thermal plane for reliable 150°C operation. |
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). |
| Wide Input Range | 3.4V–65V operation eliminates need for upstream pre-regulators in 24V/48V industrial and automotive systems. |
| Fast Minimum On-Time | 30ns on-time enables single-stage 48V-to-3.3V conversion, reducing bill-of-materials and layout complexity. |
| Robust Fault Protection | Integrated overcurrent, thermal shutdown, and PG fault signaling ensure safe operation during overload or short-circuit events. |
| Thermally Enhanced Package | MSOP-16 with exposed pad achieves θJC(PAD) = 10°C/W, enabling full 2A output at +150°C junction temperature. |
| Flexible Frequency Control | RT-programmable 200kHz–2.2MHz switching allows optimization for EMI compliance, inductor size, or efficiency. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V microcontroller, CAN transceiver, and display driver in vehicle head unit with 12V/24V battery input. IC Role / Device Role / Timing Role: Primary 2A buck regulator providing stable 3.3V rail; manages cold-crank (4.5V) and load-dump (60V) transients. Use Value: 2.5µA IQ extends backup battery life; 65V rating withstands ISO 7637-2 pulses; PG flag enables system-level power sequencing. |
Use Scenario: Generating 5V/2A for digital I/O isolation, ADC reference, and fieldbus interface in DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Main DC/DC converter supplying isolated power domains; operates continuously in -40°C to +75°C ambient. Use Value: 150°C junction rating ensures reliability in sealed enclosures; low EMI supports EMC compliance; SYNC pin enables synchronized switching across multiple rails. |
| GSM Base Station RF Power Supply | Smart Grid Sensor Node |
Use Scenario: Providing clean 5V bias for RF power amplifier stages in outdoor cellular base station equipment. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with low noise and fast transient response to PA modulation demands. Use Value: 94% efficiency at 1A reduces heat in air-cooled cabinets; 30ns on-time supports 48V→5V conversion without cascaded stages. |
Use Scenario: Powering LPWAN modem, environmental sensor, and secure MCU in battery-operated smart meter endpoint. IC Role / Device Role / Timing Role: Ultra-low-quiescent buck converter enabling multi-year operation on primary lithium battery. Use Value: 2.5µA IQ minimizes self-discharge; Burst Mode maintains <10mVP-P ripple during sleep cycles; TR/SS enables controlled wake-up sequencing. |
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 |
|---|---|---|---|
| LT8640SHMSE#TRPBF | 4A output, 3.4V–65V input, 2.5µA IQ, same package; adds spread-spectrum modulation and improved EMI performance. | Higher current capability suits dual-rail systems; spread spectrum required for strict CISPR 25 Class 5 automotive EMI limits. | Select when >2A output or certified EMI reduction is mandatory; pin-compatible but requires updated RT and inductor sizing. |
| MPQ4420AGL-AEC1-Z | 2A, 3.3V–65V input, 17µA IQ, QFN-10 package; AEC-Q100 Grade 1 qualified, no PG or SYNC pin. | Lacks power-good flag and clock sync; higher IQ limits battery lifetime; smaller footprint but higher thermal resistance (θJA = 60°C/W). | Choose for cost-sensitive automotive body electronics where PG/SYNC are unnecessary and 150°C operation is not required. |
Compared with LT8620HMSE#TRPBF, LT8640SHMSE#TRPBF offers double current and certified EMI reduction at identical thermal rating, while MPQ4420AGL-AEC1-Z trades IQ and feature set for lower cost and AEC-Q100 qualification-making each suitable for distinct reliability, efficiency, and compliance requirements.
Availability
LT8620HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and GSM RF power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8620HMSE#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 continues its legacy of high-performance power management ICs for demanding applications.
The LT8620HMSE#TRPBF belongs to the LT86xx family of high-input-voltage, ultralow-IQ synchronous buck regulators engineered for automotive, industrial, and telecom systems where wide VIN range and extreme efficiency at light loads are essential.
FAQ
What is the maximum junction temperature rating for LT8620HMSE#TRPBF?
The LT8620HMSE#TRPBF is rated for −40°C to +150°C junction temperature operation and is fully specified and guaranteed across this range. This H-grade qualification makes it suitable for under-hood automotive applications and high-ambient industrial environments where standard E- or I-grade parts would derate or fail. Thermal design must maintain θJC(PAD) ≤10°C/W via proper exposed-pad soldering.
How does LT8620HMSE#TRPBF achieve 2.5µA quiescent current?
The LT8620HMSE#TRPBF achieves 2.5µA quiescent current through optimized Burst Mode operation: during light loads, it delivers brief energy pulses to the output capacitor and then enters deep sleep, disabling most internal circuitry. This behavior is confirmed in the Electrical Characteristics table (VIN current in regulation = 20µA @100µA load) and Typical Performance graphs (G03/G04), where efficiency remains >80% down to 100µA with IQ dominated by feedback divider current.
Can LT8620HMSE#TRPBF operate with a 48V input and 3.3V output?
Yes, LT8620HMSE#TRPBF supports 48V→3.3V conversion using its 30ns minimum on-time and 65V absolute maximum input rating. At 700kHz, the required duty cycle is ~7%, well within the device's 99% capability. Efficiency exceeds 85% at 1A (per Figure G01), and the high-side FET RDS(ON) of 175mΩ ensures low dropout loss. Use a 4.7µH inductor and verify stability with the recommended FB compensation network.
What is the function of the BIAS pin on LT8620HMSE#TRPBF?
The BIAS pin on LT8620HMSE#TRPBF sources current for the internal 3.4V regulator when tied to a voltage ≥3.1V (e.g., VOUT), reducing VIN current draw and improving light-load efficiency. When VBIAS > 3.1V, INTVCC current is drawn from BIAS instead of VIN, lowering total input supply current. For 3.3V–25V outputs, connect BIAS directly to VOUT; for other voltages, add a 1µF local bypass capacitor.
Does LT8620HMSE#TRPBF require external compensation components?
No, LT8620HMSE#TRPBF features internal compensation and requires no external compensation components. Its peak-current-mode architecture with fixed internal compensation network enables stable operation with small inductors (e.g., 4.7µH) and standard output capacitors. Stability is verified across all operating conditions in the datasheet's loop-gain and transient-response plots (G33/G34), confirming robustness without user-tuned compensation.
LT8620HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8620HMSE#TRPBF FAQ
1.How can I place an order for LT8620HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8620HMSE#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 LT8620HMSE#TRPBF reliable?
The price and inventory of LT8620HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8620HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8620HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8620HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8620HMSE#TRPBF?
LT8620HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8620HMSE#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 LT8620HMSE#TRPBF?
For technical support, including LT8620HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8620HMSE#TRPBF requirements.
6.How does Aetrix verify that LT8620HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8620HMSE#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 LT8620HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8620HMSE#TRPBF?
All LT8620HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8620HMSE#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 LT8620HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8620HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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