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Analog Devices Inc. LT3693EDD#TRPBF
- Part No.:
- LT3693EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3693EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,008
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Product details
Overview
LT3693EDD#TRPBF from Analog Devices (formerly Linear Technology) is a 36V, 3.5A, 2.4MHz monolithic step-down switching regulator with integrated 95mΩ NPN switch and boost Schottky diode. It features current-mode control, programmable frequency (200kHz–2.4MHz), power good flag, soft-start, and thermal protection - designed for automotive battery regulation, industrial supplies, and wall transformer applications requiring wide input range and high efficiency.
For engineers reviewing the LT3693EDD#TRPBF datasheet, LT3693EDD#TRPBF pinout, LT3693EDD#TRPBF application, or LT3693EDD#TRPBF equivalent, key selection considerations include its 3.6V–36V input range, 0.790V feedback reference, 3.5A output capability, exposed-pad DFN-10 package, and synchronization support up to 2MHz.
Technical Context
The LT3693EDD#TRPBF employs constant-frequency current-mode PWM control with internal oscillator set by RT resistor (200kHz–2.4MHz). Its bipolar NPN switch is driven via BOOST pin using external capacitor/diode to achieve full saturation at high VIN, enabling efficient operation across 3.6V–36V inputs.
It integrates an error amplifier (525 μ℧ gm), VC clamp, active current limiting (4.6–6.0A), and a power-good comparator that asserts when FB reaches 91% of 0.790V. Shutdown draws <1μA, and RUN/SS enables soft-start via external RC ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports automotive cold-crank (≥4.5V) and industrial 24V bus with margin |
| Max Output Current | 3.5A continuous - limited by thermal resistance (θJA = 45°C/W) and internal 4.6–6.0A switch current limit |
| Switching Frequency | 200kHz to 2.4MHz - adjustable via RT pin; synchronizable 250kHz–2MHz for EMI reduction |
| Feedback Reference | 0.790V ±15mV - sets output voltage accuracy; enables 0.79V–30V programmable VOUT |
| Quiescent Current | <1μA in shutdown - ensures ultra-low system standby power in battery-powered devices |
| On-Resistance | 95mΩ typical - minimizes conduction loss at 3.5A, supporting >90% efficiency at mid-load |
| Thermal Protection | Internal junction shutdown - disables switching above 165°C to prevent damage during overload or poor heatsinking |
Pinout & Package
LT3693EDD#TRPBF uses a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11) soldered to PCB ground for low θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost Diode Anode Supply | Provides bias current to internal regulator; connects to cathode of external Schottky diode |
| BOOST (Pin 2) | Bootstrap Drive Voltage | Drives NPN switch base above VIN; requires external capacitor to enable full saturation |
| SW (Pin 3) | Switch Node | Connects to inductor, catch diode, and boost capacitor; carries high di/dt switching current |
| VIN (Pin 4) | Main Input Supply | Supplies internal regulator and switch; must be locally bypassed with ≥10μF ceramic capacitor |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Pull ≥2.5V for operation; RC network here controls output voltage ramp rate during startup |
| SYNC (Pin 6) | External Clock Input | Accepts TTL/CMOS clock edges (rise/fall <1μs); grounds when unused to avoid floating |
| PG (Pin 7) | Power Good Open-Collector | Sinks current when VOUT ≥91% of target; requires external pull-up for system monitoring |
| FB (Pin 8) | Feedback Input | Regulated to 0.790V; connects to resistor divider tap for precise output voltage setting |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC network here sets loop compensation and stability |
| RT (Pin 10) | Oscillator Frequency Set | Resistor to GND programs switching frequency (e.g., 8.66kΩ → 2.2MHz) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates need for external bootstrap diode; reduces BOM count and layout area in DFN package |
| Power Good Flag (PG) | Open-collector output signals valid regulation at 91% of target VOUT; enables sequencing and fault detection |
| Saturating Switch Design | 95mΩ on-resistance at 3.5A ensures low conduction loss and minimal thermal rise in compact DFN |
| Adjustable Soft-Start | RUN/SS pin accepts external RC to control output voltage ramp time - prevents inrush current and overshoot |
| Thermally Enhanced DFN | 3mm × 3mm package with exposed GND pad achieves θJA = 45°C/W - suitable for high-power density designs |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery rail (with cold-crank down to 3.6V) to 3.3V or 5V for infotainment ECUs. IC Role / Device Role / Timing Role: Primary buck converter delivering stable 3.5A output under wide temperature (−40°C to 125°C) and transient conditions. Use Value: Wide 3.6V–36V input handles load-dump spikes and start-stop cycles without external protection circuitry. |
Use Scenario: Distributed 24V-to-5V conversion in PLC I/O modules with space-constrained PCB layouts. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with programmable frequency to avoid noise-sensitive bands. Use Value: 2.4MHz max switching enables use of 1.0μH inductors, reducing solution size by >40% vs. 500kHz alternatives. |
| Wall Transformer Regulation | Portable Product Power |
Use Scenario: Converting unregulated 9–36V AC/DC adapter output to clean 5V for USB peripherals or IoT gateways. IC Role / Device Role / Timing Role: Primary DC-DC stage with PG flag for system power sequencing and brown-out detection. Use Value: <1μA shutdown current extends standby life; integrated boost diode simplifies adapter design certification. |
Use Scenario: Powering FPGA core or DSP in handheld test equipment with variable battery input (7–30V). IC Role / Device Role / Timing Role: Adjustable-frequency buck regulator synchronized to system clock to minimize conducted EMI. Use Value: SYNC pin allows deterministic noise placement; soft-start prevents battery voltage sag during power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#TRPBF | 42V input, 3.5A, 2MHz, synchronous rectification; no integrated boost diode; requires external bootstrap cap | Better efficiency at light loads due to synchronous FETs; higher VIN rating suits 48V systems | Select when >95% efficiency at 10mA–1A is critical and board space allows extra components |
| MPQ4420AGL-A-Z | 36V input, 2A, 2.2MHz, integrated MOSFETs; smaller 3x4mm QFN; no PG or SYNC pins | Limited output current and missing PG/SYNC restricts use in safety-critical or synchronized systems | Choose for cost-sensitive, lower-current applications where feature count can be reduced |
Compared with LT3693EDD#TRPBF, LT8610EMSE#TRPBF offers higher efficiency and wider input range but requires external bootstrap components, while MPQ4420AGL-A-Z provides smaller footprint and lower cost at the expense of current capability and monitoring features.
Availability
LT3693EDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and wall transformer regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3693EDD#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, industrial automation, and automotive markets.
The LT3693EDD#TRPBF belongs to Linear's monolithic buck regulator product line, engineered for rugged wide-input applications including automotive, industrial, and telecom power systems where reliability under voltage transients is essential.
FAQ
What is the maximum input voltage rating for LT3693EDD#TRPBF?
The absolute maximum input voltage at the VIN pin is 36V. During normal regulation, transients up to 36V are acceptable regardless of switching frequency. However, under startup, short-circuit, or overload, the safe maximum depends on frequency and minimum on-time - e.g., at 2.4MHz, max VIN drops to ~24V to avoid violating tON(MIN) ≈ 150ns. Always verify against the VIN vs. fSW derating curves in the LT3693EDD#TRPBF datasheet.
Does LT3693EDD#TRPBF require an external bootstrap diode?
No. The LT3693EDD#TRPBF integrates a boost Schottky diode connected to the BD pin, eliminating the need for an external bootstrap diode. The BD pin supplies bias current to the internal regulator and connects directly to the cathode of the external boost capacitor - simplifying layout and reducing component count versus discrete bootstrap solutions.
What is the function of the VC pin on LT3693EDD#TRPBF?
VC is the error amplifier output pin that controls peak switch current. Its voltage determines the current limit threshold and serves as the control node for loop compensation. An RC network from VC to GND sets dominant pole/zero locations; adding a small capacitor (CF) in parallel filters switching noise. The LT3693EDD#TRPBF's transconductance error amp (525 μ℧) drives this node to maintain regulation.
Can LT3693EDD#TRPBF synchronize to an external clock?
Yes. The SYNC pin (Pin 6) accepts external TTL/CMOS clock signals from 250kHz to 2MHz. Clock edges must have rise/fall times faster than 1μs. When not used, SYNC must be grounded - leaving it floating may cause erratic operation. Synchronization enables noise spectral spreading and coordinated multi-rail power sequencing in complex systems using LT3693EDD#TRPBF.
What package type and thermal characteristics does LT3693EDD#TRPBF use?
LT3693EDD#TRPBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11, GND). Its thermal resistance is θJA = 45°C/W and θJC = 10°C/W when the exposed pad is properly soldered to a ≥1cm² copper pour. This enables 3.5A operation at ambient up to 85°C with minimal heatsinking - verified per the LT3693EDD#TRPBF thermal performance graphs.
LT3693EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-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):
- 0.79V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 230kHz ~ 2.45MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT3693EDD#TRPBF FAQ
1.How can I place an order for LT3693EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3693EDD#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 LT3693EDD#TRPBF reliable?
The price and inventory of LT3693EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3693EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3693EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3693EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3693EDD#TRPBF?
LT3693EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3693EDD#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 LT3693EDD#TRPBF?
For technical support, including LT3693EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3693EDD#TRPBF requirements.
6.How does Aetrix verify that LT3693EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3693EDD#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 LT3693EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3693EDD#TRPBF?
All LT3693EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3693EDD#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 LT3693EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3693EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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