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Analog Devices Inc. LT3493EDCB#TRPBF
- Part No.:
- LT3493EDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT3493EDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,385
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Product details
Overview
LT3493EDCB#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, industrial control supplies, and wall transformer-derived power. 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 soft-start, internal compensation, and <2μA shutdown current.
For engineers reviewing the LT3493EDCB#TRPBF datasheet, LT3493EDCB#TRPBF pinout, LT3493EDCB#TRPBF application, or LT3493EDCB#TRPBF equivalent, this page provides verified technical context, package-validated pin functions, efficiency curves across VIN/VOUT/load conditions, thermal design guidance for the exposed-pad DFN, and two confirmed alternative regulators with documented functional trade-offs.
Technical Context
The LT3493EDCB#TRPBF 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 saturation, enabled by external diode-capacitor charge pump.
Undervoltage lockout (~3.4V) prevents operation below minimum input; frequency foldback activates when FB voltage drops low, limiting output current during startup or overload. The VC node serves as error amplifier output and current limit clamp point, directly tied to SHDN for soft-start ramping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V operating; 40V absolute max - supports unregulated 24V industrial rails and automotive transients. |
| Output Current | 1.2A continuous at VOUT ≥3.3V with VIN >12V - sufficient for powering microcontrollers, sensors, and interface ICs. |
| Switching Frequency | 750kHz typical - enables use of compact 10μH inductors and ceramic capacitors without audible noise. |
| Feedback Voltage | 780mV ±15mV - sets precise output via resistor divider; allows adjustable outputs down to 780mV. |
| Shutdown Current | <2μA - ensures minimal battery drain in always-on systems requiring long-term standby. |
| Switch VCE(SAT) | 330mV at 1A - reduces conduction loss and improves efficiency at medium load currents. |
| Max Duty Cycle | 91% over temperature - supports high step-down ratios (e.g., 24V→3.3V) while maintaining regulation. |
Pinout & Package
LT3493EDCB#TRPBF 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. Pin pitch is 0.5mm; recommended reflow profile follows JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback reference input | Regulated to 780mV; connects to resistor divider tap to set VOUT = 0.78V × (1 + R1/R2). |
| GND (Pin 2) | Power and signal ground | Return path for internal regulator, feedback network, and exposed pad; must connect to local ground plane. |
| BOOST (Pin 3) | Switch driver supply boost | 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; carries high di/dt switching current. |
| VIN (Pin 5) | Main power input | Supplies 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; RC network enables controlled start-up. |
| Exposed Pad (Pin 7) | Thermal & electrical ground | Must be soldered to PCB ground plane with thermal vias; critical for junction temperature management. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation components - simplifies layout and reduces BOM count. |
| Short-circuit robust | Cycle-by-cycle current limit and thermal shutdown protect against sustained output shorts without latch-up. |
| Uses tiny passive components | 750kHz operation enables 10μH inductors and 10μF ceramic output caps - saves board space and cost. |
| Low VCE(SAT) switch | 330mV drop at 1A reduces conduction loss - improves full-load efficiency by ~2–3% vs. comparable MOSFET-based parts. |
| Soft-start via SHDN pin | RC ramp on SHDN limits inrush current - prevents input rail sag and avoids tripping upstream current limits. |
Applications
| Automotive Battery Regulation | Industrial Control Supplies |
|---|---|
|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.3V or 5V for infotainment MCU, CAN transceiver, or sensor hub under cold-crank (4.2V) and load-dump (40V) conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled power domain with UVLO and overvoltage tolerance. Use Value: Maintains regulation across wide input range (4.2V–36V), survives 40V transients, and draws <2μA in shutdown during key-off. |
Use Scenario: Powering PLC I/O modules, fieldbus interfaces (RS-485, Profibus), or analog sensor front-ends from 24V industrial bus with high EMI immunity. IC Role / Device Role / Timing Role: Fixed-frequency current-mode regulator delivering clean, predictable 3.3V/5V rails with minimal external components. Use Value: 750kHz switching avoids AM radio band; internal compensation ensures stability with ceramic caps; exposed pad enables conduction cooling in sealed enclosures. |
| Wall Transformer Regulation | Battery-Powered Equipment |
|
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter output to regulated 3.3V for embedded gateways, smart meters, or IoT edge nodes. IC Role / Device Role / Timing Role: High-efficiency step-down converter handling variable input impedance and line regulation demands of off-line adapters. Use Value: Wide 3.6V–36V input accommodates brownout and overvoltage; 91% max duty cycle supports low-VIN start-up; soft-start prevents adapter overload. |
Use Scenario: Supplying portable medical monitors, handheld test equipment, or wireless sensors from single Li-ion (3.0–4.2V) or multi-cell alkaline packs. IC Role / Device Role / Timing Role: Low-quiescent buck regulator enabling extended runtime and graceful shutdown during battery depletion. Use Value: <2μA shutdown current preserves battery life; 780mV feedback allows direct 1.8V/2.5V generation; DFN package minimizes footprint in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EMSE#PBF | MOSFET-based synchronous buck; 3.5V–36V input; 2A output; 500kHz–4MHz programmable frequency; requires external compensation. | Higher efficiency at light loads due to synchronous rectification; better suited for battery-powered apps needing >85% efficiency below 100mA. | Select LTC3605EMSE#PBF when higher light-load efficiency, programmable frequency, or synchronous operation is required - accepts layout changes and added compensation components. |
| TPS54202DRCT | CMOS-based synchronous buck; 4.5V–28V input; 2A output; 500kHz fixed frequency; integrated FETs; requires external compensation. | Lower quiescent current (24μA) but no sub-μA shutdown; no BOOST pin dependency; simpler external component count than LT3493EDCB#TRPBF. | Select TPS54202DRCT when input range is limited to 4.5V–28V and ultra-low shutdown current is not required - offers pin-compatible replacement only in non-automotive temp grades. |
Compared with LT3493EDCB#TRPBF, LTC3605EMSE#PBF delivers higher efficiency at light loads via synchronous rectification but requires external compensation and lacks sub-μA shutdown; TPS54202DRCT simplifies design with integrated MOSFETs and no BOOST circuit but sacrifices automotive-grade temperature range and ultra-low shutdown current.
Availability
LT3493EDCB#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and wall transformer-derived power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3493EDCB#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 support for legacy Linear power products, including reliability testing, documentation, and long-term manufacturing commitments.
The LT3493 product line was designed for rugged, wide-input DC/DC conversion in harsh environments - specifically targeting automotive, industrial, and distributed power applications where input transients, thermal constraints, and long-term reliability are critical.
FAQ
What is the operating temperature range for LT3493EDCB#TRPBF?
The LT3493EDCB#TRPBF is specified for operation from –40°C to +85°C ambient temperature. This grade is validated per Linear Technology's characterization and statistical process controls across the full range, with maximum junction temperature limited to 125°C. Derating is required above 85°C ambient depending on PCB thermal design and load conditions.
Does LT3493EDCB#TRPBF require an external BOOST capacitor and diode?
Yes, LT3493EDCB#TRPBF requires an external BOOST capacitor (typically 0.1μF) and fast-switching diode (e.g., 1N4148) to generate a voltage ≥2.3V above the SW pin. This is essential to fully saturate the internal bipolar NPN switch and achieve specified 330mV VCE(SAT) and efficiency. Omitting or undersizing these components causes excessive switch dissipation and potential thermal shutdown.
Can LT3493EDCB#TRPBF regulate output voltages below 1V?
Yes, LT3493EDCB#TRPBF can regulate down to 780mV, as its feedback reference is precisely 780mV ±15mV. Output voltages below 1V are achievable using standard resistor dividers - for example, a 10kΩ R2 and 12.1kΩ R1 yields 1.75V, while scaling R1 lower achieves sub-1V outputs. Layout care is needed to minimize FB pin noise at low VOUT.
How does LT3493EDCB#TRPBF handle short-circuit conditions?
LT3493EDCB#TRPBF employs cycle-by-cycle current limiting with a typical switch current limit of 1.75A, plus thermal shutdown at 125°C junction temperature. During sustained short circuits, it enters hiccup mode - alternating between brief conduction and shutdown - preventing damage while limiting average power dissipation. Recovery is automatic once fault clears.
Is LT3493EDCB#TRPBF RoHS-compliant and lead-free?
Yes, LT3493EDCB#TRPBF carries the #TRPBF suffix indicating lead-free (Pb-free) finish and RoHS compliance. The device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is qualified for standard reflow soldering profiles. Part marking "LCGG" identifies the 6-lead DFN package variant.
LT3493EDCB#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LT3493EDCB#TRPBF FAQ
1.How can I place an order for LT3493EDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3493EDCB#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#TRPBF reliable?
The price and inventory of LT3493EDCB#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3493EDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3493EDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3493EDCB#TRPBF?
LT3493EDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3493EDCB#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#TRPBF?
For technical support, including LT3493EDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3493EDCB#TRPBF requirements.
6.How does Aetrix verify that LT3493EDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3493EDCB#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3493EDCB#TRPBF?
All LT3493EDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3493EDCB#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3493EDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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