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Analog Devices Inc. LT3693IDD#TRPBF
- Part No.:
- LT3693IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3693IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,098
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Product details
Overview
LT3693IDD#TRPBF from Analog Devices (formerly Linear Technology) is a 36V, 3.5A, 2.4MHz adjustable-frequency monolithic buck switching regulator with integrated 95mΩ NPN switch and boost Schottky diode. It delivers regulated 0.79V–30V output in automotive battery regulation and industrial supply applications, featuring current-mode control for fast transient response and thermal protection.
For engineers reviewing the LT3693IDD#TRPBF datasheet, LT3693IDD#TRPBF pinout, LT3693IDD#TRPBF application, or LT3693IDD#TRPBF equivalent, key selection criteria include its 200kHz–2.4MHz programmable frequency via RT resistor, 0.790V feedback reference, power good flag, soft-start capability, and thermally enhanced 3mm × 3mm DFN-10 package with exposed GND pad.
Technical Context
The LT3693IDD#TRPBF employs constant-frequency current-mode PWM control with an internal oscillator set by an external RT resistor. Its bipolar NPN switch is driven via BOOST pin voltage-generated by an external capacitor-diode network-to ensure saturation and low conduction loss (335mV at 3.5A).
It integrates a transconductance error amplifier (525 μ℧), VC pin-based peak-current control, active VC clamping for current limiting, and a dedicated open-collector PG flag that asserts when FB reaches 91% of regulation. Shutdown draws <1μA from VIN, 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 wide-range industrial and automotive inputs without pre-regulation |
| Max Output Current | 3.5A continuous - limited by thermal design and switch current rating (4.6–6.0A typical limit) |
| Switching Frequency | 200kHz to 2.4MHz - adjustable via RT resistor; enables optimization of size vs. efficiency |
| Feedback Reference | 0.790V ±10mV - precise reference enabling accurate output programming from 0.79V to 30V |
| Power Good Flag | Open-collector PG with 65mV threshold offset - signals valid regulation at 91% of target VOUT |
| Shutdown Current | <1μA - ensures ultra-low system standby power in battery-powered applications |
| On-Resistance | 95mΩ - low RDS(on) equivalent for NPN switch reduces conduction loss and thermal stress |
| Package Thermal Resistance | θJA = 45°C/W, θJC = 10°C/W - exposed pad enables efficient heat transfer to PCB ground plane |
Pinout & Package
LT3693IDD#TRPBF is housed in a 10-lead, 3mm × 3mm plastic DFN package with exposed pad (Pin 11), which must be soldered to PCB ground for thermal and electrical integrity. The package supports high-power density designs in space-constrained environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Bias Diode Anode Input | Connects to boost Schottky anode; supplies bias current to internal regulator for improved efficiency |
| BOOST (Pin 2) | Boost Drive Voltage | Provides >VIN voltage to saturate internal NPN switch; requires external capacitor-diode network |
| SW (Pin 3) | Switch Node | High-side switch output; connects to inductor, catch diode, and boost capacitor |
| VIN (Pin 4) | Main Power Input | Supplies internal regulator and switch; requires local ceramic bypass (≥10μF X7R) |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Logic-level enable (≥2.5V); external RC sets controlled VOUT ramp during startup |
| SYNC (Pin 6) | External Clock Input | Accepts 250kHz–2MHz clock for synchronization; must not float; rise/fall <1μs |
| PG (Pin 7) | Power Good Output | Open-collector flag; pulled low until VOUT reaches 91% of regulation; valid only if VIN >3.6V |
| FB (Pin 8) | Feedback Input | Regulated to 0.790V; connects to resistor divider for output voltage programming |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC network to ground provides loop compensation |
| RT (Pin 10) | Oscillator Frequency Set | Resistor-to-ground sets switching frequency (200kHz–2.4MHz); tolerance affects accuracy |
| Exposed Pad (Pin 11) | Thermal & Electrical Ground | Must be soldered to PCB GND plane; critical for thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates need for external boost diode; reduces BOM count and layout area |
| Synchronizable Switching | Accepts external clock (250kHz–2MHz) to eliminate beat frequencies in multi-rail systems |
| Current-Mode Control | Enables inherent cycle-by-cycle current limiting and stable operation across wide duty cycles |
| Thermal Shutdown Protection | Automatically disables switching above safe junction temperature; resumes after cooldown |
| Adjustable Minimum On/Off Time | Configurable via RT to maintain stable operation across input/output voltage ratios (e.g., 36V→3.3V) |
| Frequency Foldback | Reduces switching frequency during startup or overload to limit peak inductor current |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery rails to 3.3V/5V for infotainment ECUs and ADAS sensors under cold-crank (4.5V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Primary buck regulator with wide VIN range, thermal robustness, and PG flag for system health monitoring. Use Value: Maintains regulation across automotive transients without external TVS or pre-regulator; 3.5A output supports multi-rail SoC power domains. |
Use Scenario: Providing isolated 12V/15V intermediate rails in PLC backplanes and motor drive I/O modules where input varies from 18V–36V DC. IC Role / Device Role / Timing Role: High-efficiency step-down converter with programmable frequency to avoid EMI-sensitive bands in noisy factory environments. Use Value: 2.4MHz max frequency enables use of compact 2.2μH inductors; exposed-pad DFN ensures reliable operation at 85°C ambient. |
| Portable Product Power | Wall Transformer Regulation |
Use Scenario: Converting 9–24V adapter outputs to 1.2V/1.8V for FPGA core logic and DDR memory in handheld test equipment. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with soft-start to prevent inrush into large output capacitance banks. Use Value: RUN/SS-controlled soft-start eliminates input rail sag; 0.790V reference enables tight tolerance on low-voltage rails. |
Use Scenario: Replacing linear regulators in universal-input wall adapters (90–264VAC rectified to ~12–36VDC bus) powering IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: High-input-voltage buck controller delivering 5V/3A with minimal heatsink requirement. Use Value: 36V absolute max VIN and integrated boost diode simplify front-end design; PG flag enables adapter status reporting to host MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE#PBF | 40V input, 3A output, 3mm × 4mm MSOP; no integrated boost diode; requires external bootstrap cap | Lower current rating; better suited for lower-power industrial sensors where board space allows MSOP | Select when lower quiescent current (12μA) and higher VIN margin (40V) outweigh need for integrated boost diode |
| MP2451DT-LF-Z | 36V input, 0.6A output, 8-pin SOIC; fixed 2.2MHz frequency; no PG flag or SYNC | Not suitable for 3.5A loads; used in cost-sensitive consumer accessories with simpler power trees | Choose only for sub-1A applications where footprint and BOM cost dominate over feature set and thermal performance |
Compared with LTC3630EMSE#PBF and MP2451DT-LF-Z, the LT3693IDD#TRPBF uniquely combines 3.5A capability, integrated boost diode, PG flag, and 2.4MHz programmability in a thermally optimized 3mm × 3mm DFN-making it optimal for high-density, high-reliability industrial and automotive DC/DC stages.
Availability
LT3693IDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and portable product power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3693IDD#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3693IDD#TRPBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for rugged, wide-input industrial and automotive power conversion where reliability, thermal efficiency, and integration reduce system complexity.
FAQ
What is the maximum input voltage rating for LT3693IDD#TRPBF?
The LT3693IDD#TRPBF has an absolute maximum VIN rating of 36V. During normal regulation, it tolerates input transients up to this level. However, under startup or overload, the safe operating VIN depends on switching frequency and minimum on-time constraints-lower frequencies extend the usable input range. Always verify against the VIN(MAX) equation in the datasheet for your specific fSW and VOUT.
Does LT3693IDD#TRPBF require an external boost diode?
No, the LT3693IDD#TRPBF integrates a boost Schottky diode internally. Pin BD connects directly to the anode of this diode, eliminating the need for an external component. This integration reduces bill-of-materials count and PCB area while maintaining high efficiency across the full 3.6V–36V input range.
How is the switching frequency set on LT3693IDD#TRPBF?
The switching frequency of LT3693IDD#TRPBF is set by connecting a resistor from the RT pin (Pin 10) to ground. Values from 9.09kΩ (2.4MHz) to 215kΩ (200kHz) configure the oscillator. For example, 34.0kΩ yields ~1.0MHz. Frequency accuracy depends on resistor tolerance and temperature drift, and the device supports synchronization to external clocks between 250kHz and 2MHz.
What is the function of the VC pin on LT3693IDD#TRPBF?
The VC pin (Pin 9) on LT3693IDD#TRPBF is the output of the internal transconductance error amplifier (525 μ℧). Its voltage controls peak switch current and serves as the primary loop compensation node. An RC network from VC to ground sets dominant pole-zero placement, enabling stable operation with ceramic output capacitors-no ESR dependency required.
Can LT3693IDD#TRPBF operate in dropout mode?
No, the LT3693IDD#TRPBF is a non-synchronous buck regulator and cannot operate in dropout (100% duty cycle). Its minimum off-time (~150ns) and maximum duty cycle are frequency-dependent. At 2.4MHz, the practical maximum duty cycle is ~75%, limiting minimum VIN to ~1.3×VOUT. For low-VIN/VOUT ratios, select a lower switching frequency to increase achievable duty cycle.
LT3693IDD#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)
LT3693IDD#TRPBF FAQ
1.How can I place an order for LT3693IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3693IDD#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 LT3693IDD#TRPBF reliable?
The price and inventory of LT3693IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3693IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3693IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3693IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3693IDD#TRPBF?
LT3693IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3693IDD#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 LT3693IDD#TRPBF?
For technical support, including LT3693IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3693IDD#TRPBF requirements.
6.How does Aetrix verify that LT3693IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3693IDD#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 LT3693IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3693IDD#TRPBF?
All LT3693IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3693IDD#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 LT3693IDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3693IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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