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Analog Devices Inc. LT3645HMSE#PBF
- Part No.:
- LT3645HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3645HMSE#PBF.pdf
- Description:
- IC REG DL BUCK/LNR 750KHZ 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LT3645HMSE#PBF from Analog Devices is a dual-output regulator combining a 500mA step-down switching regulator with a 200mA low-dropout linear regulator. The device is designed for automotive, industrial, and distributed power systems that need one wide-input buck rail plus a low-noise auxiliary LDO output from a compact thermally enhanced package.
As part of the LT3645 product family, LT3645HMSE#PBF combines 3.6V to 36V operation, input transient protection through 55V overvoltage lockout, 750kHz switching, a 200mA LDO regulator, programmable undervoltage lockout, internal soft-start, short-circuit robustness, and very low shutdown current. For engineers reviewing the LT3645HMSE#PBF datasheet, LT3645HMSE#PBF pinout, LT3645HMSE#PBF application, or LT3645HMSE#PBF equivalent, this device is widely used in 24V industrial rails, automotive battery systems, distributed power supplies, sensor modules, control boards, and compact dual-rail embedded systems.
Technical Context
In industrial and automotive systems, LT3645HMSE#PBF operates as a wide-input buck-plus-LDO regulator. The 500mA switching regulator converts a high or variable input into a local rail, while the 200mA LDO provides an auxiliary low-noise output from a 1.2V to 16V LDO input.
The 750kHz switching frequency supports small inductors and capacitors, and overvoltage lockout protects the circuit through input transients up to 55V. Internal soft-start and programmable undervoltage lockout help manage startup behavior.
LT3645HMSE#PBF is commonly used where a 36V input regulator, integrated LDO output, short-circuit robustness, low shutdown current, and compact thermal package are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Device Type | 36V dual-output regulator with buck regulator and LDO. |
| Input Voltage Range | 3.6V to 36V operating input range. |
| Input Transient Protection | Overvoltage lockout protects through 55V transients. |
| Buck Output Current | 500mA switching regulator output. |
| Switching Frequency | 750kHz. |
| LDO Output | 200mA LDO, 1.2V to 16V input and 0.8V to 8V output range. |
| Shutdown Current | Less than 2uA shutdown current. |
| Package | HMSE suffix indicates H-grade 12-lead thermally enhanced MSOP package option. |
Pinout & Package
The LT3645HMSE#PBF pinout includes wide-input supply, switch node, boost/drive functions, feedback, enable/undervoltage lockout, LDO input/output, soft-start/control pins, and exposed-pad ground.
For PCB design, the buck input capacitor, diode/current loop, inductor, and output capacitor should be close to the IC, while LDO output routing should be quiet and the exposed pad should connect to thermal ground copper.
| Pin / Function | PCB Design and Circuit Role |
|---|---|
| VIN | Wide input supply for the buck regulator. |
| SW | Switching node connected to the inductor. |
| BOOST | Bootstrap/drive support for the switching regulator. |
| FB | Buck feedback regulation input. |
| LDO IN | Input supply for the 200mA LDO regulator. |
| LDO OUT | Low-dropout regulator output. |
| UVLO / EN | Enable and programmable undervoltage lockout function. |
| GND / Exposed Pad | Ground and thermal return path. |
Key Features
- 36V input range supports automotive and industrial rails.
- 500mA buck output provides efficient conversion.
- 200mA LDO supplies a low-noise auxiliary rail.
- 55V transient overvoltage lockout improves robustness.
- 750kHz switching supports compact passives.
- Internal soft-start and low shutdown current support system control.
Applications
| Industrial 24V Rails | Automotive Batteries |
|---|---|
|
Use Scenario: Used in controllers and field modules. IC Role: Converts high input to local buck and LDO rails. Use Value: Supports compact robust power design. |
Use Scenario: Used in vehicle modules. IC Role: Handles wide input and transients. Use Value: Improves rail integration. |
| Sensor Modules | Control Boards |
|
Use Scenario: Used in distributed sensors. IC Role: Provides switching and low-noise rails. Use Value: Reduces regulator count. |
Use Scenario: Used in embedded industrial electronics. IC Role: Generates dual local outputs. Use Value: Supports reliable startup and thermal design. |
Equivalent & Alternatives
When evaluating a LT3645HMSE#PBF equivalent, engineers should compare input range, buck current, LDO current, transient behavior, package, shutdown current, and switching frequency.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3667IMSE#PBF | Analog Devices 40V triple supply with a 400mA buck regulator and two 200mA LDOs. | Used when the design needs two LDO rails instead of one. | Compare LDO count, buck current, package, and input range. |
| LT3500IMSE#PBF | Analog Devices 2A buck regulator with linear regulator/controller function. | Used when higher buck output current is needed. | Compare buck current, LDO structure, package, and switching frequency. |
Compared with LT3667IMSE#PBF, LT3645HMSE#PBF is a simpler two-output regulator with one buck and one LDO. LT3645HMSE#PBF vs LT3500IMSE#PBF selection depends on buck current, auxiliary linear rail requirements, input transient needs, and package compatibility.
Quality
LT3645HMSE#PBF should be sourced as original Analog Devices components through traceable supply channels. Quality checks may include thermally enhanced package inspection, top-mark validation, solderability testing, regulator output verification, enable behavior review, and thermal inspection.
Production validation should include startup sequencing, load transients, output accuracy, protection response, thermal behavior, switching ripple, and low-noise LDO performance where applicable.
Availability
LT3645HMSE#PBF available at Aetrix Electronics and is suitable for automotive, industrial, sensor, control-board, and distributed dual-rail power systems requiring stable power-management component supply support.
Supply support may include volume procurement planning, scheduled delivery arrangements, traceable sourcing management, and long-term supply support for OEM, industrial electronics, automotive electronics, and embedded product programs. Sample and NPI supply support, as well as urgent in-stock supply support, can also be arranged for prototype builds, pilot runs, and time-critical production needs.
For production builds, confirming package, suffix option, output-voltage requirements, lifecycle status, lead time, and sourcing continuity helps reduce procurement risk.
Manufacturer
Analog Devices is a global semiconductor manufacturer specializing in analog ICs, power management, mixed-signal products, data converters, RF solutions, sensors, and embedded signal-chain technologies for industrial, communication, automotive, healthcare, and consumer applications.
The LT3645 product family is an Analog Devices wide-input dual-output regulator series combining a 36V buck regulator with a 200mA LDO for automotive and industrial auxiliary supplies.
FAQ
What is LT3645HMSE#PBF used for?
LT3645HMSE#PBF is used for 24V industrial rails, automotive battery systems, distributed power supplies, sensor modules, and compact dual-rail embedded systems.
Where can I find the LT3645HMSE#PBF datasheet download?
The LT3645HMSE#PBF datasheet is available from Analog Devices and includes input ratings, LDO specifications, pin functions, package data, and application circuits.
What should be considered in LT3645HMSE#PBF pinout design?
Designers should keep the buck switching path compact, place LDO capacitors close to the pins, and connect the exposed pad to thermal ground copper.
Does LT3645HMSE#PBF include an LDO?
Yes. It includes a 200mA low-dropout linear regulator in addition to the 500mA buck regulator.
What are common LT3645HMSE#PBF equivalent solutions?
Common candidates include LT3667IMSE#PBF and LT3500IMSE#PBF depending on LDO count, buck current, package, and input-voltage requirements.
LT3645HMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 750kHz
- Voltage/Current - Output 1:
- 0.8V ~ 16V, 500mA
- Voltage/Current - Output 2:
- 0.8V ~ 8V, 200mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3.6V ~ 36V
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LT3645HMSE#PBF FAQ
1.How can I place an order for LT3645HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3645HMSE#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 LT3645HMSE#PBF reliable?
The price and inventory of LT3645HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3645HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3645HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3645HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3645HMSE#PBF?
LT3645HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3645HMSE#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 LT3645HMSE#PBF?
For technical support, including LT3645HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3645HMSE#PBF requirements.
6.How does Aetrix verify that LT3645HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3645HMSE#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 LT3645HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3645HMSE#PBF?
All LT3645HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3645HMSE#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 LT3645HMSE#PBF part is unused and in its original packaging.
Return procedure for LT3645HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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