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Analog Devices Inc. LT3493EDCB-3#TRMPBF
- Part No.:
- LT3493EDCB-3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT3493EDCB-3#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:644
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Product details
Overview
LT3493EDCB-3#TRMPBF from Analog Devices (formerly Linear Technology) is a 750kHz, current-mode PWM step-down DC/DC converter with integrated 1.75A bipolar NPN power switch, operating from 6.8V to 36V input and delivering up to 1.2A output at adjustable VOUT ≥ 780mV. It features cycle-by-cycle current limiting, soft-start, <2µA shutdown current, and thermally enhanced 2mm × 3mm DFN-6 package - ideal for automotive battery regulation and industrial control supplies.
For engineers reviewing the LT3493EDCB-3#TRMPBF datasheet, LT3493EDCB-3#TRMPBF pinout, LT3493EDCB-3#TRMPBF application, or LT3493EDCB-3#TRMPBF equivalent, key selection criteria include its fixed 750kHz switching frequency, 780mV feedback reference, 330mV VCE(SAT) at 1A, –40°C to 85°C operating range, and DFN-6 thermal pad grounding requirement.
Technical Context
The LT3493EDCB-3#TRMPBF employs constant-frequency current-mode control with slope compensation, enabling stable operation across wide duty cycles (up to 95%) and inherent pulse-by-pulse overcurrent protection. Its internal bipolar NPN switch requires external BOOST capacitor/diode to achieve full saturation, with minimum BOOST-to-SW voltage of 1.85V.
Frequency foldback activates when FB voltage drops below 0.7V, reducing switching frequency to ~36kHz during startup or overload - a deliberate design feature to limit inductor current and improve fault tolerance without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.8V to 36V operating; 40V absolute max - supports unregulated 24V industrial rails and automotive cold-crank transients. |
| Output Current | 1.2A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switching Frequency | 750kHz typical - enables use of compact 10µH inductors and ceramic output capacitors for low-profile designs. |
| Feedback Reference | 780mV ±15mV - sets precise output voltage via resistor divider; enables 3.3V, 5V, or custom outputs down to 780mV. |
| Shutdown Current | <2µA - ensures minimal battery drain in always-on portable equipment with enable-controlled power sequencing. |
| Thermal Package | 2mm × 3mm DFN-6 with exposed GND pad - requires PCB soldering to thermal vias for junction temperature ≤125°C at 1.2A load. |
| Operating Temperature | –40°C to +85°C - qualified for under-hood automotive and industrial environments without derating. |
Pinout & Package
LT3493EDCB-3#TRMPBF uses a thermally enhanced 6-lead plastic DFN package (2mm × 3mm), with Pin 7 as exposed GND pad that must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback input | Regulated to 780mV; connects to resistor divider tap to set output voltage - bias current ≤150nA minimizes divider error. |
| GND (Pin 2) | Power and signal ground | Reference node for FB, SHDN, and internal regulator; must tie to local ground plane beneath IC and components. |
| BOOST (Pin 3) | Bootstrap drive supply | Provides >VIN voltage to fully saturate internal NPN switch; requires external diode + 0.1µF capacitor referenced to SW. |
| SW (Pin 4) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor - carries high di/dt switching current; layout critical for EMI. |
| VIN (Pin 5) | Main power input | Supplies internal regulator and switch; requires local 1µF X7R/X5R ceramic bypass within 3mm of pin. |
| SHDN (Pin 6) | Enable/shutdown control | Logic-high ≥2.3V enables operation; logic-low ≤0.3V disables with <2µA quiescent current and soft-start ramp. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates need for external loop compensation components - reduces BOM count and layout sensitivity. |
| Cycle-by-cycle current limit | 1.4A to 2.2A threshold (typ. 1.75A) - provides robust short-circuit protection without external sensing resistors. |
| Soft-start via SHDN pin | RC-ramped enable voltage limits inrush current during power-up - prevents input rail collapse in multi-rail systems. |
| Low VCE(SAT) switch | 330mV at 1A - improves efficiency at medium loads versus MOSFET-based alternatives with RDS(on) drift. |
| Thermally enhanced DFN | θJA = 64°C/W - enables 1.2A operation at +85°C ambient with minimal copper area, unlike SO-8 equivalents. |
Applications
| Automotive Battery Regulation | Industrial Control Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V or 5V for infotainment MCU and CAN transceivers under cold-crank (6.8V) and load-dump (40V) conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled power domain with undervoltage lockout and thermal shutdown. Use Value: Withstands 40V transients and operates down to 6.8V input - eliminates need for upstream TVS or pre-regulator in cost-sensitive automotive modules. |
Use Scenario: Powering PLC I/O modules and fieldbus interface ICs from 24V industrial rails subject to brownouts and EMI. IC Role / Device Role / Timing Role: Fixed-frequency step-down regulator delivering clean, regulated 5V/3.3V with predictable EMI spectrum for EMC compliance. Use Value: 750kHz operation allows small 10µH inductors and ceramic caps - reduces board space by >40% vs. 250kHz alternatives while maintaining >85% efficiency at 1A. |
| Wall Transformer Regulation | Battery-Powered Equipment |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter output to stable 3.3V for IoT sensor nodes and gateways. IC Role / Device Role / Timing Role: High-input-range buck converter handling variable adapter output with no external LDO post-regulation required. Use Value: Wide 6.8–36V input range accepts low-cost, loosely regulated adapters - reduces system BOM and improves supply chain flexibility. |
Use Scenario: Power management in handheld test equipment with Li-ion battery (8.4–12.6V) supplying 3.3V to FPGA and ADC subsystems. IC Role / Device Role / Timing Role: Enable-controlled buck converter enabling deep-sleep mode with <2µA shutdown current to extend battery life. Use Value: Ultra-low shutdown current preserves battery charge during idle periods - critical for devices requiring >1-year shelf life without maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SD-3.3/NOPB | 500kHz fixed frequency, 5A switch, SO-8 package, 3.3V fixed output (non-adjustable) | Higher current but larger footprint; no adjustable VOUT or soft-start; requires external compensation | Select for higher-output-current, fixed-VOUT designs where board area is less constrained than thermal performance. |
| TPS54331DR | 3.5–28V input, 3A MOSFET, 570kHz, SO-8, adjustable VOUT, 28µA quiescent current | Lower IQ than LT3493EDCB-3#TRMPBF in active mode but higher shutdown current (1.8µA vs. <2µA); no integrated bipolar switch | Select for higher-efficiency, higher-current applications where MOSFET gate drive and external bootstrap are acceptable trade-offs. |
Compared with LM2678SD-3.3/NOPB and TPS54331DR, LT3493EDCB-3#TRMPBF delivers superior thermal performance in ultra-compact DFN-6, lower shutdown current for battery longevity, and built-in soft-start - making it optimal for space-constrained, low-quiescent-power industrial and automotive point-of-load designs.
Availability
LT3493EDCB-3#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and wall transformer regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3493EDCB-3#TRMPBF 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 full product support, documentation, and manufacturing continuity for the LT® family of high-performance analog ICs.
The LT3493EDCB-3#TRMPBF belongs to Linear's legacy high-voltage buck regulator product line, designed specifically for ruggedized power conversion in automotive, industrial, and telecom infrastructure where input transients and thermal constraints dominate design requirements.
FAQ
What is the maximum input voltage rating for LT3493EDCB-3#TRMPBF?
The LT3493EDCB-3#TRMPBF has an absolute maximum input voltage rating of 40V on the VIN pin, with recommended continuous operation from 6.8V to 36V. Exceeding 40V risks permanent damage, even momentarily - transient suppression is advised in automotive or industrial environments with load dump or inductive kickback.
Does LT3493EDCB-3#TRMPBF require external compensation components?
No, the LT3493EDCB-3#TRMPBF is internally compensated and does not require external compensation components. Its current-mode architecture and built-in slope compensation ensure stability with standard ceramic output capacitors, eliminating the need for ESR-dependent networks or loop compensation resistors/capacitors.
How is soft-start implemented on LT3493EDCB-3#TRMPBF?
Soft-start on the LT3493EDCB-3#TRMPBF is implemented via the SHDN pin: applying an RC ramp (e.g., 15kΩ + 0.1µF) to SHDN generates a controlled voltage rise that limits inrush current during startup. This avoids input rail collapse and output overshoot without requiring additional ICs or complex timing circuits.
What is the function of the BOOST pin on LT3493EDCB-3#TRMPBF?
The BOOST pin on LT3493EDCB-3#TRMPBF supplies a boosted gate drive voltage (>VIN) to fully saturate the internal bipolar NPN power switch. It requires an external diode and capacitor (e.g., 0.1µF) connected between BOOST and SW - ensuring low 330mV VCE(SAT) at 1A and maximizing efficiency across the input range.
Can LT3493EDCB-3#TRMPBF operate with ceramic output capacitors only?
Yes, LT3493EDCB-3#TRMPBF is explicitly designed for ceramic output capacitors - its current-mode control and internal compensation eliminate ESR dependency. A typical design uses 10µF X7R ceramic (e.g., 33µF for 3.3V output per COUT = 65/VOUT rule), optionally augmented with a 22pF phase-lead capacitor from VOUT to FB for light-load stability.
LT3493EDCB-3#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN 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):
- 6.8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.78V
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 750kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LT3493EDCB-3#TRMPBF FAQ
1.How can I place an order for LT3493EDCB-3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3493EDCB-3#TRMPBF 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 LT3493EDCB-3#TRMPBF reliable?
The price and inventory of LT3493EDCB-3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3493EDCB-3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3493EDCB-3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3493EDCB-3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3493EDCB-3#TRMPBF?
LT3493EDCB-3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3493EDCB-3#TRMPBF 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 LT3493EDCB-3#TRMPBF?
For technical support, including LT3493EDCB-3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3493EDCB-3#TRMPBF requirements.
6.How does Aetrix verify that LT3493EDCB-3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3493EDCB-3#TRMPBF 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 LT3493EDCB-3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3493EDCB-3#TRMPBF?
All LT3493EDCB-3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3493EDCB-3#TRMPBF, 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 LT3493EDCB-3#TRMPBF part is unused and in its original packaging.
Return procedure for LT3493EDCB-3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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