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Analog Devices Inc. LT3493IDCB#TRPBF
- Part No.:
- LT3493IDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT3493IDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,702
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Product details
Overview
LT3493IDCB#TRPBF 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 3.3V or adjustable down to 780mV, and switches at 750kHz in a thermally enhanced 2mm × 3mm DFN package.
For engineers reviewing the LT3493IDCB#TRPBF datasheet, LT3493IDCB#TRPBF pinout, LT3493IDCB#TRPBF application, or LT3493IDCB#TRPBF equivalent, key selection criteria include its –40°C to 125°C operating temperature range, 330mV VCE(SAT) at 1A, <2μA shutdown current, internal compensation, and robust short-circuit protection in compact DFN packaging.
Technical Context
The LT3493IDCB#TRPBF uses constant-frequency current-mode control with cycle-by-cycle current limiting and frequency foldback during overload. Its internal bipolar NPN switch requires external BOOST capacitor and diode to achieve full saturation, enabling efficient operation across wide input ranges.
Undervoltage lockout (~3.4V) prevents switching below minimum operating voltage, while soft-start is implemented via voltage ramping on the SHDN pin. The FB pin regulates to 780mV with ±15mV tolerance over temperature, supporting precise output adjustment using external resistor dividers.
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 at VOUT ≥ 5V with 10μH inductor - sufficient for powering microcontrollers, sensors, and interface ICs. |
| Switching Frequency | 750kHz typical - enables use of small ceramic capacitors and low-profile inductors for space-constrained designs. |
| Feedback Voltage | 780mV ±15mV over –40°C to 125°C - sets output accuracy and stability for adjustable configurations. |
| VCE(SAT) | 330mV at 1A - minimizes conduction loss and improves efficiency at high load currents. |
| Shutdown Current | <2μA - enables ultra-low-power management in battery-powered equipment during sleep modes. |
| Max Duty Cycle | 91% at TA = 25°C - determines minimum input voltage required for regulation at given output voltage. |
Pinout & Package
LT3493IDCB#TRPBF is housed in 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.
| 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 | Reference for feedback network and internal circuitry; must connect to local ground plane with low-inductance path. |
| BOOST (Pin 3) | Switch driver supply boost | Provides >VIN voltage to fully saturate internal bipolar NPN switch; requires external capacitor and fast diode. |
| SW (Pin 4) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high dI/dt switching current. |
| VIN (Pin 5) | Main input supply | Powers internal regulator and switch; requires local 1μF ceramic bypass capacitor placed near pin. |
| SHDN (Pin 6) | Enable and soft-start control | Logic-high (>2.3V) enables operation; grounded disables device and reduces IQ to <2μA; RC ramp enables controlled start-up. |
| Exposed Pad (Pin 7) | Thermal and electrical ground | Mandatory solder connection to PCB ground plane with thermal vias for junction temperature control up to 125°C. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation components, reducing BOM count and layout complexity. |
| Short-circuit robust | Cycle-by-cycle current limit and frequency foldback protect against sustained output shorts without latch-off. |
| Soft-start via SHDN pin | External RC network on SHDN controls inrush current and prevents output overshoot during power-up. |
| Low VCE(SAT) switch | 330mV drop at 1A reduces conduction losses and improves full-load efficiency by ~2–3% vs. higher-VCE alternatives. |
| Thermally enhanced DFN | θJA = 64°C/W with proper pad soldering - enables 1.2A operation in ambient up to 85°C without heatsink. |
Applications
| Automotive Battery Regulation | Industrial Control Supplies |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery rail to stable 3.3V or 5V for infotainment ECUs and ADAS sensor modules. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled power domain with fault resilience. Use Value: Withstands load dump transients up to 40V and operates reliably from –40°C to 125°C junction temperature. | Use Scenario: Powering PLC I/O modules and fieldbus interface ICs from 24V industrial supply with tight EMI constraints. IC Role / Device Role / Timing Role: High-frequency step-down regulator minimizing filter component size while maintaining EN 55022 Class B compliance. Use Value: 750kHz switching allows ceramic input/output caps and sub-5mm inductors, reducing board area by >30% vs. 100–300kHz solutions. |
| Wall Transformer Regulation | Battery-Powered Equipment |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter outputs to clean 3.3V for embedded gateways and smart meters. IC Role / Device Role / Timing Role: Input-tolerant buck controller delivering regulated output despite poor line regulation and wide input variance. Use Value: Wide 3.6–36V input range eliminates need for pre-regulator stages, simplifying power architecture and improving system efficiency. | Use Scenario: Supplying portable medical monitors or handheld test instruments powered by Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Main system regulator with ultra-low shutdown current and programmable soft-start for battery life extension. Use Value: <2μA shutdown current preserves battery charge during standby; adjustable VOUT supports multiple subsystem voltages from single cell. |
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 | Monolithic synchronous buck; 3MHz switching; 2.25V–5.5V input; 0.6V–VIN output; 1.2A rated. | Requires lower input voltage; better suited for point-of-load near FPGA/CPU; no external diode needed. | Select when input is ≤5.5V and synchronous rectification is preferred for >90% efficiency at light loads. |
| TPS54202DRCT | TI synchronous buck; 4.5–28V input; 0.6–17V output; 2A rated; integrated MOSFETs; 500kHz–2.2MHz programmable frequency. | Wider output adjustability; higher current capability; different pinout and compensation scheme. | Select when needing >1.2A output or flexible frequency tuning; verify PCB layout compatibility due to different thermal pad and pin mapping. |
Compared with LTC3605EDE#TRPBF and TPS54202DRCT, LT3493IDCB#TRPBF offers superior high-input-voltage resilience (up to 36V), bipolar switch ruggedness for short-circuit events, and guaranteed operation to 125°C - making it uniquely suitable for under-hood automotive and harsh industrial environments where input transients and ambient heat are critical constraints.
Availability
LT3493IDCB#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 ranges.
Supply support for LT3493IDCB#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, documentation, and manufacturing continuity for all LT® parts.
The LT3493 belongs to Linear's high-voltage monolithic buck regulator family, engineered for reliability in demanding environments including automotive, industrial, and telecom infrastructure where input transients, wide temperature swings, and long service life are design imperatives.
FAQ
What is the maximum operating temperature range for the LT3493IDCB#TRPBF?
The LT3493IDCB#TRPBF is specified for operation from –40°C to +125°C ambient temperature. This industrial-grade rating is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, where all guaranteed parameters apply across this full range. The 'I' grade designation in the part number explicitly denotes this extended temperature capability, distinguishing it from the 'E' grade (–40°C to +85°C). Thermal derating begins above 85°C ambient depending on PCB copper area and airflow.
Does the LT3493IDCB#TRPBF require an external catch diode?
Yes, the LT3493IDCB#TRPBF requires an external Schottky catch diode connected between SW and GND. Unlike synchronous buck converters, the LT3493IDCB#TRPBF uses an internal bipolar NPN switch and relies on this external diode for inductor current freewheeling during the off-time. Recommended devices include ON Semiconductor MBRM140 (40V, 1A) or similar 1A–2A Schottky diodes with reverse voltage rating ≥ maximum input voltage. Omitting the diode will cause catastrophic failure.
What is the purpose of the BOOST pin on the LT3493IDCB#TRPBF?
The BOOST pin on the LT3493IDCB#TRPBF provides a boosted gate drive voltage (typically VIN + VOUT) to fully saturate the internal bipolar NPN power switch, minimizing VCE(SAT) and conduction losses. It requires an external 0.1μF capacitor and fast-switching diode (e.g., 1N4148) connected between VIN and BOOST, with the diode cathode tied to BOOST and anode to SW. Proper BOOST voltage (>2.3V above SW) is essential for achieving the specified 330mV VCE(SAT) and 1.2A output current.
Can the LT3493IDCB#TRPBF be used for adjustable output voltages?
Yes, the LT3493IDCB#TRPBF supports adjustable output voltages down to 780mV using an external resistor divider connected to the FB pin. The feedback voltage is precisely regulated to 780mV (±15mV over temperature), so VOUT = 0.78V × (1 + R1/R2). R2 should be ≤20kΩ to minimize bias current error, and a 22pF phase-lead capacitor from VOUT to FB is recommended for stability at light loads. Fixed-output variants (e.g., LT3493-3.3) exist but LT3493IDCB#TRPBF is the base adjustable version.
How does the LT3493IDCB#TRPBF handle short-circuit conditions?
The LT3493IDCB#TRPBF handles short-circuit conditions through cycle-by-cycle current limiting and frequency foldback. When output current exceeds the 1.75A typical switch current limit, the controller reduces switching frequency to limit average output current and prevent thermal runaway. This robust protection allows indefinite short-circuit operation without damage, provided the inductor does not saturate and external components (diode, capacitor) are appropriately rated. No external current-sense resistor or protection IC is required.
LT3493IDCB#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):
- 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#TRPBF FAQ
1.How can I place an order for LT3493IDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3493IDCB#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 LT3493IDCB#TRPBF reliable?
The price and inventory of LT3493IDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3493IDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3493IDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3493IDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3493IDCB#TRPBF?
LT3493IDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3493IDCB#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 LT3493IDCB#TRPBF?
For technical support, including LT3493IDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3493IDCB#TRPBF requirements.
6.How does Aetrix verify that LT3493IDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3493IDCB#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 LT3493IDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3493IDCB#TRPBF?
All LT3493IDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3493IDCB#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 LT3493IDCB#TRPBF part is unused and in its original packaging.
Return procedure for LT3493IDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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