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Analog Devices Inc. LT3493IDCB#TRMPBF
- Part No.:
- LT3493IDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT3493IDCB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:948
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Product details
Overview
LT3493IDCB#TRMPBF from Analog Devices (formerly Linear Technology) is a current-mode PWM step-down DC/DC converter with an integrated 1.75A bipolar NPN power switch, designed for automotive battery regulation and industrial control supplies. It operates from 3.6V to 36V input, delivers up to 1.2A output at fixed 750kHz switching frequency, regulates output down to 780mV via feedback pin, and features short-circuit robustness and soft-start in a thermally enhanced 2mm × 3mm DFN package.
For engineers reviewing the LT3493IDCB#TRMPBF datasheet, LT3493IDCB#TRMPBF pinout, LT3493IDCB#TRMPBF application, or LT3493IDCB#TRMPBF equivalent, key selection considerations include its –40°C to 125°C operating temperature range, internal compensation, <2μA shutdown current, 330mV VCE(SAT) at 1A, and compatibility with ceramic input/output capacitors and small inductors for compact power designs.
Technical Context
The LT3493IDCB#TRMPBF implements constant-frequency current-mode control using an RS flip-flop driven by a 750kHz oscillator and slope-compensated current sensing. Its internal bipolar NPN switch requires BOOST voltage ≥2.3V above SW for full saturation, enabling efficient operation across wide input ranges.
Undervoltage lockout (~3.4V) prevents startup below minimum operating voltage; frequency foldback reduces switching frequency under low FB voltage to limit output current during overload or start-up; and active VC-node clamping provides cycle-by-cycle current limiting up to 1.75A with thermal derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V operating; 40V absolute max - supports unregulated wall transformers, 24V industrial rails, and automotive batteries. |
| Output Current | 1.2A continuous (VIN > 12V, VOUT = 3.3V); derates with input/output conditions - sufficient for microcontroller cores and sensor subsystems. |
| Switching Frequency | 750kHz typical - enables use of small 10μH inductors and ceramic capacitors, minimizing board area and EMI filter size. |
| Feedback Voltage | 780mV ±15mV - sets output via resistor divider; allows adjustable outputs down to 780mV with external R1/R2 network. |
| Shutdown Current | <2μA - enables true output disconnect and ultra-low power management in battery-powered equipment. |
| VCE(SAT) | 330mV at 1A - low conduction loss improves efficiency at medium load currents and reduces thermal stress. |
| Max Duty Cycle | 91% over temperature - supports high step-down ratios (e.g., 12V → 3.3V) while maintaining regulation at low input voltages. |
Pinout & Package
LT3493IDCB#TRMPBF uses a thermally enhanced 6-lead (2mm × 3mm) plastic DFN package with exposed pad (Pin 7) that must be soldered to PCB ground for thermal and electrical performance. The package is rated for –40°C to 125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback reference node | Regulated to 780mV; connects to resistor divider tap to set output voltage per VOUT = 0.78V × (1 + R1/R2). |
| GND (Pin 2) | Power and signal ground | Return path for internal regulator, feedback divider, and power stage; must connect to local ground plane. |
| BOOST (Pin 3) | Switch driver supply boost | Provides elevated gate drive voltage (> VIN) to saturate internal bipolar NPN switch; requires external diode/capacitor network. |
| SW (Pin 4) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt switching current. |
| VIN (Pin 5) | Main power input | Supplies internal regulator and power switch; requires local 1μF ceramic bypass capacitor. |
| SHDN (Pin 6) | Enable/shutdown control | Logic-high (≥2.3V) enables operation; grounded disables output and reduces quiescent current to <2μA; also provides soft-start when ramped. |
| Exposed Pad (Pin 7) | Thermal & electrical ground | Must be soldered to PCB ground plane with thermal vias; critical for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation components - simplifies layout and reduces BOM count for stable loop response. |
| Short-circuit robust | Withstands sustained output shorts via cycle-by-cycle current limiting and thermal protection - enhances reliability in harsh environments. |
| Soft-start via SHDN pin | External RC network on SHDN pin controls startup dV/dt and limits inrush current - prevents input rail collapse during power-up. |
| Low VCE(SAT) switch | 330mV drop at 1A reduces conduction losses and junction temperature rise - extends safe operating area at full load. |
| Wide input range | 3.6V–36V operation accommodates fluctuating sources like automotive batteries (cold crank, load dump) and industrial 24V supplies. |
Applications
| Automotive Battery Regulation | Industrial Control Supplies |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery rail to 3.3V or 5V for infotainment MCU, CAN transceiver, or sensor interface. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, regulated low-voltage domain with high input transient tolerance. Use Value: Survives cold-crank (down to ~3.6V) and load-dump (up to 40V) events without latch-off; 125°C rating ensures operation near engine bay heat sources. | Use Scenario: Powering PLC I/O modules, fieldbus interfaces, or industrial HMIs from 24V DC distribution bus. IC Role / Device Role / Timing Role: Point-of-load regulator delivering clean, stable 3.3V/5V to noise-sensitive analog and digital circuitry. Use Value: Internal compensation and 750kHz switching enable compact, low-noise design; short-circuit robustness prevents system failure during wiring faults. |
| Wall Transformer Regulation | Battery-Powered Equipment |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter output to 3.3V for embedded networking devices or IoT gateways. IC Role / Device Role / Timing Role: Efficient step-down regulator bridging variable-input off-line adapters to fixed-output logic rails. Use Value: Wide input range eliminates need for pre-regulator; ceramic capacitor compatibility reduces solution size and cost vs. electrolytic-based alternatives. | Use Scenario: Supplying 3.3V to portable medical monitors, handheld test equipment, or wireless sensors powered by Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Main system regulator managing battery-to-load conversion with ultra-low shutdown current. Use Value: <2μA shutdown current preserves battery life during standby; soft-start prevents brownout during wake-up from deep sleep modes. |
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 | 4MHz synchronous buck, 3A output, 2.5V–5.5V input - higher frequency, lower current, narrower input range. | Targeted at low-voltage, high-density applications (e.g., FPGA core rails), not wide-input industrial/automotive use. | Select LTC3605EDE#TRPBF only if input is tightly regulated ≤5.5V and 4MHz switching is required for minimal inductor size. |
| TPS54202DRCT | 2A synchronous buck, 4.5V–28V input, 500kHz–2.5MHz programmable frequency - wider output current, no BOOST pin dependency. | Requires external compensation; lacks integrated bipolar switch and BOOST architecture - simpler layout but less robust at high VIN/VOUT ratios. | Choose TPS54202DRCT for cost-sensitive, non-automotive applications where 28V max input suffices and synchronous rectification improves light-load efficiency. |
Compared with LTC3605EDE#TRPBF and TPS54202DRCT, the LT3493IDCB#TRMPBF uniquely combines wide 3.6V–36V input, bipolar switch with BOOST-driven saturation, and guaranteed 125°C operation - making it irreplaceable for automotive and industrial environments demanding ruggedness over raw efficiency or integration density.
Availability
LT3493IDCB#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and battery-powered equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3493IDCB#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, Inc. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and automotive safety markets.
The LT3493IDCB#TRMPBF belongs to Linear's high-voltage monolithic buck regulator product line, engineered specifically for reliable DC/DC conversion in electrically noisy, thermally demanding environments where input transients and extended temperature operation are critical.
FAQ
What is the maximum input voltage rating for the LT3493IDCB#TRMPBF?
The LT3493IDCB#TRMPBF has an absolute maximum input voltage rating of 40V, with a recommended operating range of 3.6V to 36V. Exceeding 36V may cause increased output ripple due to minimum on-time limitations (~120ns), though the device remains functional and undamaged up to 40V if inductor current stays below 2.2A and components are properly rated.
Does the LT3493IDCB#TRMPBF require external compensation components?
No, the LT3493IDCB#TRMPBF is internally compensated. Its control loop is factory-tuned for stability with standard external components (e.g., 10μH inductor, 10μF output capacitor), eliminating the need for external compensation networks and reducing design complexity and BOM count.
What is the purpose of the BOOST pin on the LT3493IDCB#TRMPBF?
The BOOST pin on the LT3493IDCB#TRMPBF supplies elevated voltage to fully saturate the internal bipolar NPN power switch. It must be ≥2.3V above the SW pin voltage, typically generated using an external diode and capacitor (e.g., 0.1μF + 1N4148). This architecture enables high efficiency across wide input/output voltage ratios.
Can the LT3493IDCB#TRMPBF operate in shutdown mode with zero output current?
Yes - when the SHDN pin is pulled to GND, the LT3493IDCB#TRMPBF enters shutdown mode with input current reduced to <2μA and output disconnected. This enables true zero-power standby in battery-powered systems, preserving charge during extended idle periods without external load switches.
What package type and thermal characteristics does the LT3493IDCB#TRMPBF use?
The LT3493IDCB#TRMPBF uses a 6-lead 2mm × 3mm plastic DFN package with exposed thermal pad (Pin 7), rated for –40°C to 125°C operation. Its θJA is 64°C/W; optimal thermal performance requires soldering the exposed pad to a PCB ground plane with multiple thermal vias.
LT3493IDCB#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):
- 3.6V
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LT3493IDCB#TRMPBF FAQ
1.How can I place an order for LT3493IDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3493IDCB#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 LT3493IDCB#TRMPBF reliable?
The price and inventory of LT3493IDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3493IDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3493IDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3493IDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3493IDCB#TRMPBF?
LT3493IDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3493IDCB#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 LT3493IDCB#TRMPBF?
For technical support, including LT3493IDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3493IDCB#TRMPBF requirements.
6.How does Aetrix verify that LT3493IDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3493IDCB#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 LT3493IDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3493IDCB#TRMPBF?
All LT3493IDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3493IDCB#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 LT3493IDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3493IDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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