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Analog Devices Inc. LT3693EDD#PBF
- Part No.:
- LT3693EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3693EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,860
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Product details
Overview
LT3693EDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic 36V, 3.5A, 2.4MHz current-mode step-down switching regulator with integrated 95mΩ NPN switch and boost Schottky diode. It delivers regulated 0.79V–30V output in automotive battery regulation and industrial distributed power systems, featuring soft-start, power good flag, and thermal protection.
For engineers reviewing the LT3693EDD#PBF datasheet, LT3693EDD#PBF pinout, LT3693EDD#PBF application, or LT3693EDD#PBF equivalent, this page provides verified package mapping (3mm × 3mm DFN-10), confirmed 200kHz–2.4MHz frequency adjustability via RT pin, validated 0.790V feedback reference, and real-world efficiency curves at 5V/3.3V outputs under 12V–34V input conditions.
Technical Context
The LT3693EDD#PBF implements constant-frequency current-mode control with internal oscillator (RT-programmable), slope compensation, and VC-pin-based error amplifier servoing. Its bipolar NPN switch is driven by a BOOST-supplied voltage higher than VIN to ensure saturation, enabling high efficiency across 3.6V–36V input range.
It integrates a power-good comparator (91% VFB threshold, 10mV hysteresis), RUN/SS-controlled shutdown (<1μA IQ), and thermal shutdown. Frequency foldback during startup/overload and minimum on/off times (~150ns) define practical VIN/VOUT operating boundaries per application design constraints.
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 transients without derating. |
| Max Output Current | 3.5A continuous - limited by internal 4.6–6.0A switch current threshold and thermal resistance (θJA = 45°C/W). |
| Switching Frequency | 200kHz to 2.4MHz - set by RT resistor; enables compact 4.7μH inductors at 600kHz or <2.2μH at 2.4MHz. |
| Feedback Reference | 0.790V ±15mV - sets output accuracy; allows precise 3.3V/5V/12V regulation with standard 1% resistors. |
| Power Good Flag | Open-collector PG output active when VOUT ≥ 91% of target - provides system-level power sequencing confirmation. |
| Shutdown Current | <1μA - achieved by pulling RUN/SS ≤0.2V; enables ultra-low-power standby in portable applications. |
| On-Resistance | 95mΩ typical - reduces conduction loss at full load; contributes to >90% peak efficiency at 12V→5V/3.5A. |
Pinout & Package
LT3693EDD#PBF uses a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11) soldered to PCB for low θJC = 10°C/W. Pin numbering follows top-view layout with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Bias Diode Anode | Connects to external Schottky anode; supplies bias current to internal regulator-improves efficiency when tied to VOUT. |
| BOOST (Pin 2) | Boost Drive Voltage | Provides >VIN voltage to saturate internal NPN switch; requires external capacitor/diode network. |
| SW (Pin 3) | Switch Node | Drives inductor and catch diode; high dV/dt node requiring tight layout and ground plane coupling. |
| VIN (Pin 4) | Main Input Supply | Supplies internal regulator and switch; must be locally bypassed with ≥10μF X7R ceramic capacitor. |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Pull ≤0.2V for shutdown (<1μA IQ); ramp with RC network for controlled VOUT rise time. |
| SYNC (Pin 6) | External Clock Input | Accepts 250kHz–2MHz square wave for EMI reduction; must not float-tie to GND if unused. |
| PG (Pin 7) | Power Good Output | Open-collector flag pulled high externally; asserts when VFB ≥ 91% of 0.790V (i.e., VOUT ≥ 0.719V). |
| FB (Pin 8) | Feedback Input | Regulated to 0.790V; connects to resistor divider tap-determines output voltage with ±1.9% tolerance. |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC network to GND sets loop compensation-no ESR dependency for stability. |
| RT (Pin 10) | Frequency Set Resistor | Resistor to GND sets fSW; e.g., 63.4kΩ → 600kHz, 9.09kΩ → 2.4MHz per datasheet Figure 1. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external boost diode-reduces BOM count and board area while maintaining >90% efficiency at 5V/3.5A. |
| Synchronizable Switching | Accepts external clock (250kHz–2MHz) to align switching edges-critical for noise-sensitive imaging or RF subsystems. |
| Thermally Enhanced DFN | 3mm × 3mm footprint with exposed GND pad-enables 3.5A operation at +85°C ambient without heatsink. |
| Current-Mode Control | Provides inherent cycle-by-cycle current limiting and fast transient response-supports <10μs recovery from 1A→3A load steps. |
| Adjustable Soft-Start | RC network on RUN/SS pin controls VOUT ramp rate-prevents inrush current and stabilizes upstream supplies. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery (with cold-crank dips to 4.5V and load-dump spikes to 36V) to stable 5V/3.3V for infotainment ECUs. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-cleaned DC supply with PG signaling for microcontroller boot sequencing. Use Value: 36V absolute max rating and 3.6V min start-up enable reliable operation across automotive transients; PG flag ensures safe MCU initialization. |
Use Scenario: Point-of-load conversion in programmable logic controllers (PLCs) where 24V field bus powers multiple 3.3V/5V sensor interfaces and communication ICs. IC Role / Device Role / Timing Role: Local DC-DC regulator delivering 3.5A at 3.3V with thermal shutdown and soft-start to prevent brownouts during hot-swap module insertion. Use Value: 95mΩ switch and integrated boost diode sustain >88% efficiency at full load; DFN package fits dense industrial PCB layouts. |
| Portable Product Power | Wall Transformer Regulation |
Use Scenario: Powering handheld test equipment with Li-ion battery (3.0–4.2V) and 12V wall adapter inputs, requiring dual-input 5V/3.3V rails. IC Role / Device Role / Timing Role: Wide-input buck regulator supporting both battery and adapter modes; RUN/SS enables seamless input source handoff. Use Value: <1μA shutdown current extends battery life; 2.4MHz operation allows use of 1.5μH inductor for minimal solution size. |
Use Scenario: Replacing linear regulators in AC/DC wall adapters to improve efficiency and reduce heat in compact enclosures. IC Role / Device Role / Timing Role: High-efficiency step-down stage converting unregulated 12–36V DC from bridge rectifier to stable 5V USB output. Use Value: Integrated switch and boost diode eliminate 2 external components; thermal protection prevents failure during sustained overload. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | 42V input, 3.5A, 2MHz synchronous buck; no integrated boost diode; requires external bootstrap capacitor. | Higher input voltage rating (42V vs 36V); better suited for 48V industrial systems; lacks BD pin for bias optimization. | Choose LT8610EMSE#PBF for 48V input compatibility and synchronous rectification; avoid if BD-driven efficiency gain is critical. |
| TPS54360DGQR | 60V input, 3.5A, 100kHz–2.5MHz adjustable; external MOSFET driver; no integrated switch or boost diode. | Wider frequency range but requires external high-side FET and bootstrap circuit; higher BOM cost and layout complexity. | Choose TPS54360DGQR for ultra-high input voltage (60V) or custom FET selection; LT3693EDD#PBF offers lower component count for 36V-class designs. |
Compared with LT8610EMSE#PBF and TPS54360DGQR, the LT3693EDD#PBF delivers optimal integration for 36V-input, 3.5A applications-its monolithic switch, integrated boost diode, and BD pin enable simpler, more efficient designs where 42V+ rating is unnecessary.
Availability
LT3693EDD#PBF 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 LT3693EDD#PBF 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 precision instrumentation, industrial automation, and automotive markets.
The LT3693EDD#PBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for robust 36V-input power conversion in harsh environments like automotive and industrial control systems.
FAQ
What is the maximum input voltage rating for LT3693EDD#PBF?
The LT3693EDD#PBF has an absolute maximum input voltage of 36V on the VIN pin and 56V on the BOOST pin. For continuous operation, the recommended maximum input is 36V. During regulated operation with no overload, it tolerates 36V transients; during startup or overload, the safe VIN limit depends on switching frequency and minimum on-time-e.g., at 2.4MHz, max VIN drops to ~28V per datasheet Equation 1.
Does LT3693EDD#PBF require an external boost diode?
No, the LT3693EDD#PBF integrates a boost Schottky diode on-die, eliminating the need for an external component. The BD pin connects to the anode of this internal diode and also supplies bias current to the internal regulator-when tied to VOUT, it improves efficiency by reducing VIN-supplied quiescent current.
How is the switching frequency set on LT3693EDD#PBF?
The switching frequency of LT3693EDD#PBF is set by a resistor (RT) connected from Pin 10 (RT) to ground. Values range from 9.09kΩ (2.4MHz) to 215kΩ (200kHz). For example, 63.4kΩ yields 600kHz. The relationship is non-linear and documented in Figure 1 of the datasheet; frequency foldback occurs automatically during startup or overload.
What is the function of the RUN/SS pin on LT3693EDD#PBF?
The RUN/SS pin (Pin 5) serves dual functions: applying ≤0.2V places LT3693EDD#PBF in shutdown (<1μA IQ), while applying ≥2.5V enables operation. When used with an external resistor-capacitor network, it provides soft-start-ramping the VC pin voltage to control output voltage rise time and limit inrush current.
Can LT3693EDD#PBF synchronize to an external clock?
Yes, LT3693EDD#PBF supports external synchronization via the SYNC pin (Pin 6), accepting TTL/CMOS clock signals from 250kHz to 2MHz. Clock edges must have rise/fall times <1μs. If unused, SYNC must be grounded-leaving it floating may cause erratic operation or increased EMI.
LT3693EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3693EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3693EDD#PBF 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#PBF reliable?
The price and inventory of LT3693EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3693EDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3693EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3693EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3693EDD#PBF?
LT3693EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3693EDD#PBF 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#PBF?
For technical support, including LT3693EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3693EDD#PBF requirements.
6.How does Aetrix verify that LT3693EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3693EDD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3693EDD#PBF?
All LT3693EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3693EDD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3693EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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