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Analog Devices Inc. LT3693EMSE#TRPBF
- Part No.:
- LT3693EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3693EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,850
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Product details
Overview
LT3693EMSE#TRPBF 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, on-chip 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#TRPBF datasheet, LT3693EMSE#TRPBF pinout, LT3693EMSE#TRPBF application, or LT3693EMSE#TRPBF equivalent, key selection considerations include its 0.790V feedback reference, synchronizable operation (250kHz–2MHz), 1μA shutdown current, exposed-pad MSOP-10 thermal performance, and integrated bias regulation via BD pin.
Technical Context
The LT3693EMSE#TRPBF employs constant-frequency current-mode control with an internal oscillator set by an external RT resistor. Its error amplifier drives the VC pin to regulate peak switch current, while slope compensation ensures stability across duty cycles. The BD pin enables external bias sourcing above 3V to improve efficiency.
Power-good signaling occurs when FB reaches 91% of 0.790V (i.e., ~720mV), with open-collector PG output valid only when VIN > 3.6V and RUN/SS is high. Frequency foldback reduces switching frequency during startup or overload to limit inductor current, and minimum on/off times (~150ns each) constrain usable duty cycle range per selected fSW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports wide-range industrial and automotive battery inputs without pre-regulation |
| Max Output Current | 3.5A - sustained delivery into load with thermal derating per MSOP-10 θJA = 45°C/W |
| Switch RDS(on) | 95mΩ - low conduction loss enabling high efficiency at full load |
| Feedback Reference | 0.790V ±15mV - precise setting point for output voltage programming via resistor divider |
| Shutdown Current | <1μA - enables ultra-low-power system sleep modes |
| Switching Frequency | 200kHz to 2.4MHz - adjustable via RT pin; synchronizable 250kHz–2MHz for EMI reduction |
| Power Good Threshold | 91% of VFB (≈720mV) - provides reliable output regulation monitoring with 65mV hysteresis |
Pinout & Package
LT3693EMSE#TRPBF is housed in a thermally enhanced 10-lead plastic MSOP package with exposed pad (Pin 11) soldered to PCB ground for low thermal resistance (θJA = 45°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost Diode Anode Supply | Connects to external Schottky anode; also powers internal bias regulator when >3V |
| BOOST (Pin 2) | Bootstrap Drive Voltage | Provides elevated gate drive for internal NPN switch via external capacitor/diode network |
| SW (Pin 3) | Switch Node | Output of internal power switch; connects to inductor, catch diode, and boost capacitor |
| VIN (Pin 4) | Main Input Supply | Primary power source for internal regulator and switch; requires local ceramic bypass |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Logic-level enable (≥2.5V = on); RC ramp here controls output voltage slew rate |
| SYNC (Pin 6) | External Clock Input | Accepts TTL/CMOS clock edges (rise/fall <1μs) for synchronization; must not float |
| PG (Pin 7) | Power Good Flag | Open-collector output active low until VOUT reaches 91% of target; requires pull-up |
| FB (Pin 8) | Feedback Input | Sense node regulated to 0.790V; connects to resistor divider tap for output voltage setting |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC network here sets loop compensation |
| RT (Pin 10) | Oscillator Frequency Set | Resistor-to-ground sets switching frequency from 200kHz to 2.4MHz |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external diode, reducing BOM count and board area in compact designs |
| Thermally Enhanced MSOP-10 | Exposed pad improves heat dissipation-critical for 3.5A continuous operation in space-constrained layouts |
| Current-Mode Control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sensing |
| Adjustable Soft-Start | RC network on RUN/SS pin prevents inrush current and output overshoot during power-up |
| Frequency Foldback | Automatically lowers fSW during startup or overload to maintain safe peak inductor current |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery rails to stable 3.3V or 5V for infotainment ECUs and ADAS sensors. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled power with cold-crank tolerance down to 3.6V. Use Value: Maintains regulation during engine cranking transients (down to 3.6V) and handles load dump spikes up to 36V without external protection. | Use Scenario: Powering PLC I/O modules and fieldbus interfaces in factory automation systems with unregulated 24V DC supplies. IC Role / Device Role / Timing Role: Local point-of-load regulator converting noisy industrial 24V bus to clean 5V/12V for analog front-ends and microcontrollers. Use Value: Integrated boost diode and current-mode control suppress noise coupling; PG flag enables system-level fault reporting. |
| Portable Product Power | Wall Transformer Regulation |
Use Scenario: Step-down conversion in handheld test equipment powered by multi-cell Li-ion packs (up to 16.8V) or 24V adapters. IC Role / Device Role / Timing Role: High-efficiency main supply delivering 3.5A to FPGA or ARM SoC subsystems with programmable fSW for EMI tuning. Use Value: 2.4MHz max switching enables use of sub-2.2μH inductors, minimizing solution size and weight. | Use Scenario: Replacing linear regulators in AC/DC wall adapters requiring 5V/3A output from 9–36V DC intermediate bus. IC Role / Device Role / Timing Role: Efficient primary DC-DC stage replacing inefficient LDOs or discrete buck controllers in compact adapter PCBs. Use Value: 95mΩ switch and integrated bias path via BD pin achieve >90% efficiency at full load, reducing thermal stress in enclosed housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#TRPBF | 40V input, 3A output, 3mm × 3mm DFN-16; no integrated boost diode; requires external bootstrap capacitor | Better suited for higher input voltage margin (40V vs. 36V) but needs extra components and layout area | Select when input transients exceed 36V or when DFN thermal performance is preferred over MSOP |
| MP2451DT-LF-Z | 36V input, 2A output, SOIC-8; no PG flag, no SYNC, fixed 550kHz fSW; lower cost, smaller footprint | Limited to ≤2A loads; lacks system-monitoring features (PG) and EMI control (SYNC) | Select for cost-sensitive, lower-current applications where soft-start and power sequencing are non-critical |
Compared with LTC3631EMSE#TRPBF and MP2451DT-LF-Z, the LT3693EMSE#TRPBF uniquely combines 3.5A capability, integrated boost diode, PG flag, and 200kHz–2.4MHz adjustability in a thermally optimized MSOP-10-making it optimal for space-constrained, feature-rich industrial and automotive designs requiring robust regulation and diagnostics.
Availability
LT3693EMSE#TRPBF 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 traceable sourcing.
Supply support for LT3693EMSE#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.
The LT3693EMSE#TRPBF belongs to Linear's high-voltage monolithic buck regulator family, engineered for rugged industrial and automotive environments demanding wide input range, integrated functionality, and thermal reliability.
FAQ
What is the maximum input voltage rating for LT3693EMSE#TRPBF?
The absolute maximum input voltage (VIN) for LT3693EMSE#TRPBF is 36V, as specified in the Absolute Maximum Ratings table. Operation up to this level is supported continuously when the device is in regulation; during startup or overload, the practical maximum depends on selected switching frequency and minimum on-time constraints. The BOOST pin has a higher 56V absolute maximum rating, but VIN must remain ≤36V.
Does LT3693EMSE#TRPBF require an external Schottky diode?
No, LT3693EMSE#TRPBF integrates a boost Schottky diode on-die, eliminating the need for an external diode in the bootstrap circuit. The BD pin connects directly to the anode of this internal diode, simplifying design and reducing component count-though an external Schottky may still be used on the catch path if higher reverse voltage or thermal performance is required.
How is the output voltage programmed on LT3693EMSE#TRPBF?
The output voltage of LT3693EMSE#TRPBF is set using a resistor divider between VOUT and the FB pin, referenced to the internal 0.790V feedback voltage. For example, to set 5V output: R1 = R2 × ((5V / 0.790V) − 1). Standard 1% resistors are recommended, and the FB pin bias current is only 10–40nA, minimizing divider error.
What thermal considerations apply to LT3693EMSE#TRPBF in MSOP-10 package?
LT3693EMSE#TRPBF in the MSOP-10 package features an exposed pad (Pin 11) that must be soldered to a PCB ground plane to achieve θJA = 45°C/W and θJC = 10°C/W. Without proper pad connection, thermal resistance increases significantly, risking thermal shutdown at ≥3.5A loads. Layout guidelines recommend ≥200mm² copper area under the pad with multiple thermal vias to inner/ground layers.
Can LT3693EMSE#TRPBF synchronize to an external clock?
Yes, LT3693EMSE#TRPBF supports external clock synchronization via the SYNC pin (Pin 6), accepting TTL- or CMOS-compatible signals from 250kHz to 2MHz. Clock edges must have rise/fall times faster than 1μs, and the pin must never be left floating-tie to GND if unused. This capability enables EMI reduction through frequency dithering or alignment with system clocks.
LT3693EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT3693EMSE#TRPBF FAQ
1.How can I place an order for LT3693EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3693EMSE#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 LT3693EMSE#TRPBF reliable?
The price and inventory of LT3693EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3693EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3693EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3693EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3693EMSE#TRPBF?
LT3693EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3693EMSE#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 LT3693EMSE#TRPBF?
For technical support, including LT3693EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3693EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3693EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3693EMSE#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 LT3693EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3693EMSE#TRPBF?
All LT3693EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3693EMSE#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 LT3693EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3693EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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