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Analog Devices Inc. LT3493EDCB-3#TRPBF
- Part No.:
- LT3493EDCB-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT3493EDCB-3#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,797
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Product details
Overview
LT3493EDCB-3#TRPBF 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 at adjustable output down to 780mV. It features cycle-by-cycle current limiting, soft-start, <2µA shutdown current, and thermally enhanced 2mm × 3mm DFN-6 package. It is used in automotive battery regulation and industrial control supplies.
For engineers reviewing the LT3493EDCB-3#TRPBF datasheet, LT3493EDCB-3#TRPBF pinout, LT3493EDCB-3#TRPBF application, or LT3493EDCB-3#TRPBF equivalent, key selection criteria include input voltage range (6.8–36V), fixed 750kHz switching frequency, internal compensation, 780mV feedback reference, and robust short-circuit protection without external components.
Technical Context
The LT3493EDCB-3#TRPBF employs constant-frequency current-mode control with a 750kHz oscillator and slope-compensated current sensing. Its internal bipolar NPN switch requires BOOST pin voltage ≥2.3V above SW for full saturation, enabling efficient operation across wide input ranges.
It integrates undervoltage lockout (6.8V), frequency foldback below 36kHz under low FB voltage, and active VC-node clamping for current limit and soft-start via SHDN pin ramping - all without requiring external loop compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.8V to 36V operating; supports unregulated 24V industrial rails and automotive batteries. |
| Switching Frequency | 750kHz typical; enables use of small 10µH inductors and ceramic output capacitors. |
| Output Current | 1.2A continuous; limited by thermal performance in DFN-6 package at TA ≤ 85°C. |
| Feedback Reference | 780mV ±15mV; sets output voltage via resistor divider (e.g., 3.3V = 0.78V × (1 + R1/R2)). |
| Shutdown Current | <2µA; enables true output disconnect for battery-powered system power management. |
| Switch VCE(SAT) | 330mV at 1A; minimizes conduction loss and improves efficiency at medium load currents. |
| Operating Temp | –40°C to +85°C (E-grade); qualified for automotive and industrial ambient environments. |
Pinout & Package
LT3493EDCB-3#TRPBF is housed in a thermally enhanced, lead-free, 6-lead (2mm × 3mm) plastic DFN package with exposed pad (Pin 7) that must be soldered to PCB ground 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. |
| GND (Pin 2) | Power and signal ground | Reference node for FB divider and internal regulator; must connect to local ground plane. |
| BOOST (Pin 3) | Bootstrap drive supply | Provides >VIN voltage to fully saturate internal NPN switch; requires external diode + capacitor. |
| SW (Pin 4) | Switch node | Connects to inductor, catch diode cathode, and boost capacitor anode; carries high di/dt switching current. |
| VIN (Pin 5) | Main input supply | Powers internal regulator and switch; requires local 1µF ceramic bypass close to pin. |
| SHDN (Pin 6) | Enable/soft-start control | Logic-high (≥2.3V) enables operation; grounded disables output and reduces IQ to <2µA; RC ramp enables controlled start-up. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network - simplifies layout and reduces BOM count. |
| Cycle-by-cycle current limit | Protects against shorted outputs without external sensing; limits peak switch current to 1.75A typ. |
| Thermally enhanced DFN | θJA = 64°C/W; exposed pad soldered to GND enables reliable 1.2A operation at +85°C ambient. |
| Soft-start via SHDN pin | RC-filtered SHDN ramp controls inrush current during startup - prevents input surge and output overshoot. |
| Low shutdown current | <2µA quiescent draw in shutdown; critical for long battery life in portable or always-on systems. |
Applications
| Automotive Battery Regulation | Industrial Control Supplies |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery rail to 3.3V or 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter providing stable, noise-immune power under wide input transients (load dump, cold crank). Use Value: Withstands 40V absolute max input and operates down to 6.8V, ensuring functionality during cranking; 750kHz switching avoids AM band interference. | Use Scenario: Powering PLC I/O modules and sensor interfaces from 24V factory bus with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Compact, self-contained step-down regulator replacing discrete switcher designs on space-limited DIN-rail boards. Use Value: DFN-6 footprint saves board area; internal compensation and current limit reduce design risk and qualification time. |
| Wall Transformer Regulation | Battery-Powered Equipment |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter output to clean 3.3V for embedded gateways and IoT edge nodes. IC Role / Device Role / Timing Role: Input-tolerant buck controller handling variable, noisy, and poorly regulated inputs without external LDO post-regulation. Use Value: Wide 6.8–36V input range accepts legacy adapters; 780mV reference allows precise low-voltage outputs without trimming. | Use Scenario: Supplying 3.3V to ARM Cortex-M microcontrollers and BLE radios in portable medical monitors with multi-year battery life. IC Role / Device Role / Timing Role: High-efficiency primary regulator with ultra-low shutdown current and programmable soft-start. Use Value: <2µA shutdown current extends shelf life; soft-start prevents brownout during wake-up; 750kHz enables tiny passive components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | Higher 3MHz switching frequency; 1.5A output; requires external compensation; different pinout. | Better suited for ultra-compact designs needing smaller inductors; not drop-in compatible. | Select LTC3605EDE#TRPBF only when board redesign permits higher frequency layout and added compensation components. |
| TPS54202DRCT | 4.5–28V input; 2A output; integrated MOSFETs; 500kHz–2.2MHz adjustable frequency; different package (SON-10). | Wider VIN range at lower end but narrower upper limit; higher current capability; requires external soft-start timing. | Choose TPS54202DRCT for cost-sensitive industrial designs where 28V max input suffices and higher output current is needed. |
Compared with LTC3605EDE#TRPBF and TPS54202DRCT, the LT3493EDCB-3#TRPBF offers superior high-input-voltage resilience (up to 36V), simpler implementation (internal compensation, fixed 750kHz), and proven robustness in automotive transients - making it optimal for 24V+ systems where layout simplicity and reliability outweigh raw current or frequency specs.
Availability
LT3493EDCB-3#TRPBF 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 and input voltage ranges.
Supply support for LT3493EDCB-3#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 maintains full product support, datasheets, and application engineering for legacy Linear regulators including the LT3493 series.
The LT3493 family was designed for rugged, high-input-voltage DC/DC conversion in automotive, industrial, and telecom infrastructure - emphasizing fault tolerance, minimal external components, and thermal efficiency in compact packages.
FAQ
What is the maximum input voltage rating for LT3493EDCB-3#TRPBF?
The absolute maximum input voltage for LT3493EDCB-3#TRPBF is 40V, but its specified operating range is 6.8V to 36V. Operation at 40V is permissible only as a transient condition while the output remains in regulation; sustained operation above 36V may trigger pulse-skipping mode and increase output ripple. The device's undervoltage lockout activates below 6.8V, and the BOOST pin must remain ≤50V and ≥2.3V above SW.
Does LT3493EDCB-3#TRPBF require external compensation components?
No, LT3493EDCB-3#TRPBF is internally compensated and does not require external compensation components. Its current-mode architecture and built-in slope compensation eliminate the need for type-II or type-III compensation networks - reducing bill-of-materials count and layout complexity. Stability is ensured across all recommended output capacitor types, including low-ESR ceramics.
What is the purpose of the BOOST pin on LT3493EDCB-3#TRPBF?
The BOOST pin on LT3493EDCB-3#TRPBF provides a boosted gate drive voltage (≥2.3V above SW) to fully saturate the internal bipolar NPN power switch, minimizing VCE(SAT) and conduction losses. It requires an external flying capacitor and fast diode (e.g., 1N4148 or BAT54) connected between VIN and BOOST, with the diode cathode tied to BOOST and anode to SW. Proper BOOST voltage ensures >90% duty cycle capability and high efficiency across the input range.
Can LT3493EDCB-3#TRPBF be used in automotive applications?
Yes, LT3493EDCB-3#TRPBF is qualified for –40°C to +85°C operation (E-grade) and supports automotive battery regulation per ISO 7637-2 pulse requirements. Its 6.8–36V input range covers cold-crank (down to ~6.5V) and load-dump (up to 36V sustained, 40V transient) conditions. Combined with cycle-by-cycle current limiting and thermal shutdown, it delivers robust performance in engine control units, body electronics, and ADAS power domains.
How does soft-start work on LT3493EDCB-3#TRPBF?
Soft-start on LT3493EDCB-3#TRPBF is implemented by applying a controlled voltage ramp to the SHDN pin using an external resistor and capacitor. When SHDN rises from 0V to ≥2.3V, the internal VC node is clamped to this ramp, gradually increasing peak switch current and preventing input surge. A typical 15kΩ resistor and 0.1µF capacitor yields ~1.5ms ramp time - sufficient to limit inrush while maintaining fast system wake-up. No additional circuitry is required beyond the RC network.
LT3493EDCB-3#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3493EDCB-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3493EDCB-3#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 LT3493EDCB-3#TRPBF reliable?
The price and inventory of LT3493EDCB-3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3493EDCB-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3493EDCB-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3493EDCB-3#TRPBF?
LT3493EDCB-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3493EDCB-3#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 LT3493EDCB-3#TRPBF?
For technical support, including LT3493EDCB-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3493EDCB-3#TRPBF requirements.
6.How does Aetrix verify that LT3493EDCB-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3493EDCB-3#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 LT3493EDCB-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3493EDCB-3#TRPBF?
All LT3493EDCB-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3493EDCB-3#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 LT3493EDCB-3#TRPBF part is unused and in its original packaging.
Return procedure for LT3493EDCB-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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