My Inquiry
My Account
Analog Devices Inc. LT1939IDD#PBF
- Part No.:
- LT1939IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT1939IDD#PBF.pdf
- Description:
- IC REG DL BUCK/LINEAR 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:158
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1939IDD#PBF from Analog Devices is a dual step-down switching regulator that integrates two power switches for compact two-rail power conversion. The device is designed for embedded systems that need two regulated buck outputs from a shared input supply without using two separate switching regulator ICs.
As part of the LT1939 product family, LT1939IDD#PBF provides dual current-mode buck regulation, high-frequency operation, independent control of regulator channels, compact DFN packaging, and adjustable output rails for local power supplies. For engineers reviewing the LT1939IDD#PBF datasheet, LT1939IDD#PBF pinout, LT1939IDD#PBF application, or LT1939IDD#PBF equivalent, this device is widely used in automotive electronics, industrial modules, distributed power regulation, communication boards, portable instruments, and compact dual-rail embedded systems.
Technical Context
In embedded power systems, LT1939IDD#PBF operates as a dual buck regulator that generates two lower-voltage rails from a common input. This is useful when one board requires separate logic, analog, memory, I/O, or peripheral supplies.
The integrated switch architecture reduces external component count compared with controller-based solutions. Independent channel control allows sequencing or selective shutdown of rail groups according to system power state.
LT1939IDD#PBF is commonly used where compact DFN packaging, high-frequency switching, dual-output conversion, and Linear Technology current-mode regulation are needed for local power-tree design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Device Type | Dual step-down switching regulator with integrated power switches. |
| Output Count | Two independent buck regulator outputs. |
| Control | Independent shutdown/control behavior supports rail management. |
| Output Voltage | Adjustable buck outputs support local logic and auxiliary rails. |
| Package | IDD suffix indicates compact DFN package option. |
| Applications | Automotive, industrial, communication, portable, and distributed power systems. |
| Design Value | Combines two buck regulators in one IC to reduce footprint. |
| Topology | Current-mode step-down regulator architecture. |
Pinout & Package
The LT1939IDD#PBF pinout includes input supply pins, two switch nodes, feedback pins, boost pins, enable/shutdown pins, compensation nodes, and ground/thermal connections.
For PCB design, each buck switch loop should be compact, feedback nodes should be routed away from switching copper, and the DFN exposed pad should connect to a solid thermal ground plane.
| Pin / Function | PCB Design and Circuit Role |
|---|---|
| VIN | Input supply for both buck regulator channels. |
| SW1 / SW2 | Switching nodes for the two buck regulators. |
| BOOST Pins | Bootstrap drive nodes for internal switches. |
| FB1 / FB2 | Feedback inputs setting each output voltage. |
| VC / COMP | Compensation pins for loop stability. |
| SHDN / RUN | Shutdown or enable controls for channel management. |
| GND / Exposed Pad | Ground and thermal return path. |
Key Features
- Two buck regulators reduce separate IC count.
- Integrated power switches simplify compact layouts.
- Independent channel control supports sequencing.
- Adjustable outputs support multiple rail requirements.
- DFN package saves board area.
- Suitable for distributed and local dual-rail supplies.
Applications
| Distributed Power | Industrial Modules |
|---|---|
|
Use Scenario: Used near local loads on embedded boards. IC Role: Generates two buck rails from one input. Use Value: Improves board-level power density. |
Use Scenario: Used in controllers and instruments. IC Role: Supplies logic and auxiliary rails. Use Value: Reduces regulator count. |
| Communication Boards | Automotive Electronics |
|
Use Scenario: Used in networking and interface electronics. IC Role: Creates separate digital and analog rails. Use Value: Supports compact dual-output power. |
Use Scenario: Used in vehicle embedded modules. IC Role: Provides two local step-down outputs. Use Value: Supports robust compact power conversion. |
Equivalent & Alternatives
When evaluating a LT1939IDD#PBF equivalent, engineers should compare input range, dual-output current capability, switching frequency, package, independent shutdown behavior, and compensation requirements.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3507IUHF#PBF | Analog Devices triple buck regulator with three outputs instead of two. | Used when a design needs an additional buck rail. | Compare output count, current, package, and sequencing needs. |
| TPS542941 | Texas Instruments dual synchronous buck converter family with different current ratings and package options. | Used in embedded systems requiring two integrated buck outputs. | Compare input range, output current, package, and compensation. |
Compared with LT3507IUHF#PBF, LT1939IDD#PBF is a simpler dual-output solution for two buck rails. LT1939IDD#PBF vs TPS542941 selection depends on current requirements, package, switching behavior, control pins, and existing PCB layout.
Quality
LT1939IDD#PBF should be sourced as original Analog Devices components through traceable channels. Quality checks may include DFN package inspection, top-mark validation, solderability testing, and dual-output electrical verification.
Production validation should include both buck outputs, startup sequencing, load transients, thermal performance, compensation stability, and switch-node layout behavior.
Availability
LT1939IDD#PBF available at Aetrix Electronics and is suitable for automotive, industrial, communication, portable, and distributed dual-rail power systems.
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, rail current, output voltage, lifecycle status, 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 LT1939 product family is an Analog Devices dual step-down regulator series integrating two switching regulators for compact two-rail embedded power systems.
FAQ
What is LT1939IDD#PBF used for?
LT1939IDD#PBF is used for automotive, industrial, communication, portable, and distributed systems requiring two buck regulator outputs.
Where can I find the LT1939IDD#PBF datasheet download?
The LT1939IDD#PBF datasheet is available from Analog Devices and includes electrical ratings, package information, pin descriptions, and application guidance.
What should be considered in LT1939IDD#PBF pinout design?
Designers should keep both buck switching loops compact, route feedback away from switch nodes, and use the exposed pad for thermal grounding.
Does LT1939IDD#PBF include two regulators?
Yes. It integrates two step-down switching regulator channels.
What are common LT1939IDD#PBF equivalent solutions?
Common candidates include LT3507IUHF#PBF and TPS542941 depending on output count, current, package, and control requirements.
LT1939IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 500kHz ~ 2.4MHz
- Voltage/Current - Output 1:
- 0.8V ~ 24.25V, 2A
- Voltage/Current - Output 2:
- 0.8V ~ 24.25V, 1A
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3V ~ 25V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
LT1939IDD#PBF FAQ
1.How can I place an order for LT1939IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1939IDD#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 LT1939IDD#PBF reliable?
The price and inventory of LT1939IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1939IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1939IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1939IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1939IDD#PBF?
LT1939IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1939IDD#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 LT1939IDD#PBF?
For technical support, including LT1939IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1939IDD#PBF requirements.
6.How does Aetrix verify that LT1939IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1939IDD#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 LT1939IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1939IDD#PBF?
All LT1939IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1939IDD#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 LT1939IDD#PBF part is unused and in its original packaging.
Return procedure for LT1939IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1939IDD#PBF Tags
-
TPS6521905RHBR
Texas Instruments
-
MIC3385YHL-TR
Microchip Technology
-
A4402ELPTR-T
Allegro MicroSystems
-
LM26480SQ-AA/NOPB
Texas Instruments
-
A4402KLPTR-T
Allegro MicroSystems
-
BD71847AMWV-E2
ROHM Semiconductor
-
ADP5040ACPZ-1-R7
Analog Devices Inc.
-
LT3048IDC#TRPBF
Analog Devices Inc.
-
ADP5037ACPZ-R7
Analog Devices Inc.
-
XRP7714ILB-F
MaxLinear, Inc.
-
LTC3260EDE#TRPBF
Analog Devices Inc.
-
LTC3260EMSE#PBF
Analog Devices Inc.
Tech Hub
Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…
Machine vision system guide covering components, inspection workflow, camera and lens selection, FOV, pixel resolution, motion blur, strobe lighting, bandwidth, 2D/3D vision, integration, troubleshooti…
Electronic devices and circuits guide covering passive components, semiconductors, analog and digital circuits, circuit theory, practical calculations, troubleshooting, datasheet selection, and learnin…
Oil pressure sensor diagnosis covering symptoms, location, testing, replacement, socket access, common failure cases, and the electronic signal path between the pressure sensor, wiring, ECU and gauge s…
MLCC ESR, impedance and self-resonant frequency in decoupling networks. Covers PDN behavior, frequency response, measurement methods, failure cases and practical capacitor selection for power integrity…
An actuator converts a control signal and energy source into mechanical motion. This guide explains actuator types, working principles, electric and linear actuators, automotive use cases, troubleshoot…
A potentiometer is a three-terminal adjustable resistor used for voltage division, analog control, calibration and signal adjustment. This guide explains wiring, symbols, types, 10k values, digital pot…
An FPGA is reconfigurable digital hardware used for custom logic, parallel processing, low-latency I/O and interface control. This guide explains FPGA meaning, architecture, boards, programming flow, a…
A logic gate is a basic digital circuit that uses Boolean logic to convert binary inputs into one output. This guide explains AND, OR, NOT, NAND, NOR, XOR, truth tables, universal gates, logic ICs and …
A mass air flow sensor, often called a MAF sensor, measures the amount of air entering an engine.
