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Analog Devices Inc. LT3693EMSE#PBF
- Part No.:
- LT3693EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3693EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:489
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Product details
Overview
LT3693EMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode step-down switching regulator supporting 3.6V–36V input, delivering up to 3.5A output with adjustable switching frequency from 200kHz to 2.4MHz. It integrates a 95mΩ NPN power switch, boost Schottky diode, soft-start, power-good flag, and thermal protection-designed for automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT3693EMSE#PBF datasheet, LT3693EMSE#PBF pinout, LT3693EMSE#PBF application, or LT3693EMSE#PBF equivalent, key selection considerations include its 0.790V feedback reference, synchronizable operation (250kHz–2MHz), integrated boost diode, 1μA shutdown current, and thermally enhanced 10-pin MSOP package with exposed GND pad.
Technical Context
The LT3693EMSE#PBF employs constant-frequency current-mode control with internal slope compensation, enabling fast transient response and stable loop behavior across wide duty-cycle ranges. Its oscillator is resistor-programmable via the RT pin and supports external synchronization between 250kHz and 2MHz.
Operation relies on a bipolar NPN switch driven by a BOOST pin voltage elevated above VIN via an external capacitor-diode network; the BD pin supplies bias current to the internal regulator. The VC pin serves as the error amplifier output, directly controlling peak switch current and providing active current limiting at 4.6–6.0A depending on duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports direct connection to 12V/24V automotive and industrial rails without pre-regulation. |
| Max Output Current | 3.5A continuous - limited by thermal design and inductor saturation; switch current limit is 4.6–6.0A depending on duty cycle. |
| Switching Frequency | 200kHz to 2.4MHz - set by RT resistor; enables optimization of inductor size vs. efficiency and dropout performance. |
| Feedback Reference | 0.790V ±10mV - precise reference enables accurate output programming from 0.79V to 30V using external resistive divider. |
| Shutdown Current | <1μA - ensures ultra-low system standby power when RUN/SS is pulled low. |
| Power Good Threshold | 91% of regulated VOUT - open-collector PG flag asserts high when output reaches regulation tolerance, enabling system sequencing. |
| On-Resistance (SW) | 335mV at 3.5A - corresponds to ~95mΩ typical RCE(SAT), defining conduction loss and thermal dissipation under full load. |
Pinout & Package
LT3693EMSE#PBF is housed in a thermally enhanced 10-lead plastic MSOP package (MSE) with exposed pad (Pin 11) soldered to PCB ground for low θJA = 45°C/W and θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Bias Diode Anode Input | Connects to anode of external Schottky diode; supplies current to internal bias regulator - improves efficiency when tied to regulated output. |
| BOOST (Pin 2) | Boost Drive Voltage | Provides elevated gate drive voltage (>VIN) to fully saturate internal NPN switch; requires external capacitor-diode network. |
| SW (Pin 3) | Switch Node | Output of internal NPN power switch; connects to inductor, catch diode cathode, and boost capacitor - high dV/dt node requiring careful layout. |
| VIN (Pin 4) | Main Power Input | Supplies current to internal regulator and power switch; must be locally bypassed with ≥10μF ceramic capacitor near the pin. |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Pull ≤0.2V to shut down (IQ <1μA); apply RC ramp for controlled VOUT rise; also clamps VC during startup. |
| SYNC (Pin 6) | External Clock Input | Accepts TTL/CMOS clock edges (rise/fall <1μs) for synchronization between 250kHz–2MHz; tie to GND if unused. |
| PG (Pin 7) | Power Good Flag | Open-collector output; pulls low until FB reaches 91% of target - requires external pull-up for system monitoring/sequencing. |
| FB (Pin 8) | Feedback Input | Regulated to 0.790V; connects to resistor divider tap - sets output voltage per VOUT = 0.79 × (1 + R1/R2). |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; used for loop compensation via RC network to GND - determines stability and transient response. |
| RT (Pin 10) | Oscillator Frequency Set | Resistor-to-GND sets switching frequency (200kHz–2.4MHz); value selected per manufacturer's RT vs. fSW table. |
| Exposed Pad (Pin 11) | Thermal & Electrical Ground | Must be soldered to PCB ground plane - primary thermal path and low-impedance return for high-current paths. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates need for external boost diode - reduces BOM count and layout area while maintaining efficient NPN switch saturation. |
| Synchronizable Switching | Enables noise-sensitive systems to align switching edges with master clock (250kHz–2MHz), minimizing EMI and beat frequencies. |
| Programmable Soft-Start | RC network on RUN/SS pin controls output voltage ramp rate - prevents inrush current and stabilizes upstream supplies during power-up. |
| Thermal Shutdown Protection | Halts switching when junction temperature exceeds safe limit - prevents damage during overload or poor heatsinking conditions. |
| Frequency Foldback | Reduces switching frequency during startup or overload - limits peak inductor current and maintains control under low-VIN or short-circuit conditions. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
|
Use Scenario: Regulating 12V/24V vehicle battery rail to stable 3.3V or 5V for infotainment, ADAS sensors, and body control modules. IC Role / Device Role / Timing Role: Primary buck converter handling wide input transients (load dump, cold crank) and meeting AEC-Q200 stress requirements. Use Value: 36V absolute max rating and thermal robustness ensure reliable operation across automotive temperature range (–40°C to 125°C). |
Use Scenario: Local point-of-load conversion in PLC I/O modules, motor drives, and factory automation controllers. IC Role / Device Role / Timing Role: High-current DC-DC stage converting 24V industrial bus to isolated or non-isolated logic supply rails. Use Value: 3.5A output and integrated switch enable compact, high-efficiency designs without external MOSFET drivers or discrete switches. |
| Portable Product Power | Wall Transformer Regulation |
|
Use Scenario: Powering FPGA, DSP, or microcontroller subsystems in handheld test equipment and portable medical devices. IC Role / Device Role / Timing Role: Main system regulator accepting wide-input unregulated wall adapters or Li-ion battery packs (8.4V–30V). Use Value: Adjustable frequency allows trade-off between small inductor size (high fSW) and high efficiency (low fSW) based on battery life requirements. |
Use Scenario: Replacing linear regulators in AC-DC adapter secondary-side regulation for consumer electronics and IoT gateways. IC Role / Device Role / Timing Role: Efficient step-down stage replacing inefficient 78xx-style regulators after bridge rectification and bulk capacitance. Use Value: 95mΩ switch and integrated boost diode deliver >90% efficiency at 2A–3A loads, reducing heat sink requirements and improving no-load standby performance. |
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#PBF | 42V input, 3.5A, silent switcher architecture; 2.2MHz max fSW; lower EMI, higher quiescent current (2.5μA). | Better suited for noise-sensitive RF or audio systems; less ideal for ultra-low-IQ battery backup scenarios. | Choose LT8610EMSE#PBF when EMI compliance (CISPR 25 Class 5) is mandatory and board space permits larger package. |
| TPS54360DGQR | 36V input, 3.5A, current-mode control; 100kHz–2.5MHz fSW; no integrated boost diode; higher RDS(on) (~120mΩ). | Requires external bootstrap diode; better thermal performance at high ambient due to SOIC-8 package; lacks PG flag. | Choose TPS54360DGQR when cost sensitivity outweighs layout simplicity, and power-good signaling is not required. |
Compared with LT3693EMSE#PBF, LT8610EMSE#PBF offers superior EMI performance but higher standby current, while TPS54360DGQR reduces BOM cost at the expense of added external components and missing fault signaling - making LT3693EMSE#PBF optimal for thermally constrained, feature-complete industrial and automotive buck designs.
Availability
LT3693EMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supply, and portable product power applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LT3693EMSE#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 ICs, serving precision instrumentation, industrial automation, and automotive markets.
The LT3693 belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for rugged, wide-input industrial and automotive power conversion where integration, thermal performance, and reliability are critical.
FAQ
What is the maximum input voltage rating for LT3693EMSE#PBF?
The LT3693EMSE#PBF has an absolute maximum input voltage rating of 36V on the VIN pin and 56V on the BOOST pin. For continuous operation, the recommended maximum input is 36V. During transient events like load dump, the device may tolerate brief excursions up to 36V only if the output is already in regulation - otherwise, frequency foldback and minimum on/off time constraints require derating based on fSW and VOUT.
Does LT3693EMSE#PBF require an external boost diode?
No - the LT3693EMSE#PBF integrates a boost Schottky diode internally, eliminating the need for an external diode in the bootstrap circuit. The BD pin connects directly to the anode of this internal diode and supplies bias current to the internal regulator. This integration reduces component count, PCB area, and potential failure points in high-reliability designs.
How is the switching frequency set on LT3693EMSE#PBF?
The switching frequency of LT3693EMSE#PBF is set by connecting a resistor from the RT pin (Pin 10) to ground. The value determines fSW across 200kHz–2.4MHz per the manufacturer's RT vs. fSW lookup table. For example, 34.0kΩ yields ~1.0MHz. The RT pin also accepts external clock signals via the SYNC pin for synchronization within 250kHz–2MHz.
What is the function of the VC pin on LT3693EMSE#PBF?
On the LT3693EMSE#PBF, the VC pin is the output of the internal transconductance error amplifier. Its voltage directly controls peak switch current and thus regulates output voltage. Loop compensation is implemented via an RC network from VC to ground, and the pin features active clamping for current limiting and soft-start control - making it central to both stability and protection behavior.
Can LT3693EMSE#PBF operate with a 3.3V output at 3.5A?
Yes - the LT3693EMSE#PBF supports output voltages from 0.79V to 30V, including 3.3V at full 3.5A load. Achieving this requires proper inductor selection (e.g., 3.3μH for 600kHz operation), low-ESR output capacitance (≥47μF ceramic), and thermal management via the exposed pad. Efficiency exceeds 90% at 12VIN/3.3VOUT/2A per typical performance curves.
LT3693EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT3693EMSE#PBF FAQ
1.How can I place an order for LT3693EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3693EMSE#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 LT3693EMSE#PBF reliable?
The price and inventory of LT3693EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3693EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3693EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3693EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3693EMSE#PBF?
LT3693EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3693EMSE#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 LT3693EMSE#PBF?
For technical support, including LT3693EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3693EMSE#PBF requirements.
6.How does Aetrix verify that LT3693EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3693EMSE#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 LT3693EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3693EMSE#PBF?
All LT3693EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3693EMSE#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 LT3693EMSE#PBF part is unused and in its original packaging.
Return procedure for LT3693EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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