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Analog Devices Inc. LT3693IMSE#PBF
- Part No.:
- LT3693IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3693IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:195
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Product details
Overview
LT3693IMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode step-down switching regulator with integrated 95mΩ NPN power switch and boost Schottky diode, supporting 3.6V to 36V input, 0.79V to 30V adjustable output, 3.5A max load, and 200kHz–2.4MHz programmable switching frequency. It delivers regulated power in automotive battery systems, industrial supplies, and portable product power rails.
For engineers reviewing the LT3693IMSE#PBF datasheet, LT3693IMSE#PBF pinout, LT3693IMSE#PBF application, or LT3693IMSE#PBF equivalent, key selection considerations include its 10-pin MSOP thermal-enhanced package, soft-start via RUN/SS pin, power-good flag (PG), integrated boost diode, and synchronization capability across 250kHz–2MHz.
Technical Context
The LT3693IMSE#PBF implements constant-frequency current-mode control with an internal transconductance error amplifier (525 μ℧), slope compensation, and RS flip-flop oscillator driven by the RT pin resistor. Its bipolar NPN switch is driven via BOOST pin voltage-generated externally using a Schottky diode and capacitor-to ensure saturation at high duty cycles.
It features active VC pin clamping for current limiting, frequency foldback during startup/overload, and a precision 0.790V feedback reference with ±10mV tolerance over temperature. The PG flag asserts when FB reaches 91% of regulation, and shutdown draws <1μA from VIN while maintaining valid PG behavior above 3.6V VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports wide-range industrial and automotive battery inputs without external pre-regulation. |
| Max Output Current | 3.5A - sustained continuous load capability with internal switch rated for 4.6–6.0A current limit depending on duty cycle. |
| Switching Frequency | 200kHz to 2.4MHz - set by RT pin resistor; enables tradeoffs between inductor size (higher fSW → smaller L) and efficiency/dropout (lower fSW → better high-VIN operation). |
| Feedback Reference | 0.790V ±10mV - precise, low-drift reference enabling accurate output programming from 0.79V to 30V using external resistive divider. |
| Power Good Threshold | 91% of VFB (≈720mV at 0.79V ref) with 10mV hysteresis - provides reliable output regulation monitoring for system sequencing. |
| Shutdown Quiescent Current | <1μA - enables ultra-low-power standby in battery-powered applications without external enable circuitry. |
| Thermal Package | 10-Lead MSOP with exposed pad - θJA = 45°C/W, θJC = 10°C/W; requires PCB soldering of exposed pad for thermal integrity. |
Pinout & Package
LT3693IMSE#PBF is housed in a thermally enhanced 10-lead plastic MSOP package with exposed pad (Pin 11) that must be soldered to PCB ground for thermal and electrical performance. Pin numbering follows standard MSOP top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost Diode Anode Supply | Connects to Schottky diode anode; supplies bias current to internal regulator - improves efficiency when tied to regulated output. |
| BOOST (Pin 2) | Switch Drive Boost Node | Provides >VIN voltage to saturate internal NPN switch; requires external boost capacitor and Schottky diode. |
| SW (Pin 3) | Switch Node | Output of internal power switch; connects to inductor, catch diode cathode, and boost capacitor. |
| VIN (Pin 4) | Main Input Supply | Primary power source for internal regulator and switch; requires local ceramic bypass (≥10μF X7R/X5R). |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Logic-level enable (≥2.5V = ON); resistor-capacitor network here sets controlled VOUT ramp rate during startup. |
| SYNC (Pin 6) | External Clock Input | Accepts TTL/CMOS clock (250kHz–2MHz) to synchronize switching; must not float - tie to GND if unused. |
| PG (Pin 7) | Power Good Flag | Open-collector output; pulled low until VOUT reaches 91% of target - used for system power sequencing. |
| FB (Pin 8) | Feedback Input | Sense node regulated to 0.790V; connects to resistor divider tap - determines output voltage accuracy and loop stability. |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC network to GND sets loop compensation - critical for transient response and stability. |
| RT (Pin 10) | Oscillator Frequency Set | Resistor-to-ground sets switching frequency (200kHz–2.4MHz); value selected per Figure 1 in datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates need for external boost diode - reduces BOM count and layout area while ensuring reliable switch drive under all load conditions. |
| Saturating NPN Switch (95mΩ) | Enables high-efficiency operation at high duty cycles (>75%) where MOSFET-based regulators suffer conduction loss penalties. |
| Programmable Soft-Start | Controlled output voltage ramp via RUN/SS pin RC network - prevents inrush current and stabilizes upstream supplies during power-up. |
| Thermal Shutdown Protection | Automatically disables switching and latches off when junction temperature exceeds safe operating limit - protects against sustained overload or poor heatsinking. |
| Current-Mode Control Architecture | Delivers fast transient response and inherent cycle-by-cycle current limiting - simplifies compensation and improves reliability under dynamic loads. |
Applications
| Automotive Battery Regulation | Industrial Power Supply |
|---|---|
|
Use Scenario: Regulating 12V/24V vehicle battery to stable 5V or 3.3V for infotainment ECUs and ADAS sensors under cold-crank (4.5V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated DC power with input transient tolerance and thermal robustness. Use Value: Wide 3.6V–36V input range handles automotive transients without external protection; PG flag enables safe microcontroller boot sequencing. |
Use Scenario: Generating 15V and 5V rails from 24V or 48V factory automation bus for PLC I/O modules and motor drivers. IC Role / Device Role / Timing Role: High-current, thermally efficient point-of-load regulator in DIN-rail mounted enclosures with limited airflow. Use Value: 3.5A output and exposed-pad MSOP package sustain full load at 85°C ambient; SYNC input allows noise-sensitive systems to avoid EMI bands. |
| Portable Product Power | Wall Adapter Regulation |
|
Use Scenario: Converting 9–20V USB PD or barrel-jack adapter output to 3.3V for handheld medical devices with strict battery life requirements. IC Role / Device Role / Timing Role: Main system power supply with ultra-low shutdown IQ (<1μA) and programmable frequency for optimal efficiency vs. size tradeoff. Use Value: Adjustable fSW allows use of compact 1.0μH inductors at 2.4MHz; soft-start prevents battery voltage sag during turn-on. |
Use Scenario: Replacing linear regulators in legacy wall adapters to improve efficiency and reduce heat in space-constrained consumer electronics. IC Role / Device Role / Timing Role: High-efficiency drop-in replacement for 78xx-style regulators in fixed-output configurations (e.g., 5V @ 2A). Use Value: Integrated switch and boost diode eliminate 3 external components; 0.79V reference enables accurate 5.0V output with 1% resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE#PBF | 40V input, 3A max, 1.2MHz fixed fSW, MOSFET-based, no integrated boost diode | Requires external bootstrap diode/capacitor; lower max current but higher efficiency at light loads due to MOSFET architecture | Prefer for designs prioritizing light-load efficiency and where board space allows external boost components. |
| MP2451DT-LF-Z | 36V input, 0.6A max, 2.2MHz fixed fSW, integrated MOSFET, no PG or SYNC | Lower current rating and missing PG/SYNC limits use in sequenced or noise-sensitive systems | Consider only for cost-sensitive, low-current applications where full feature set is unnecessary. |
Compared with LTC3630EMSE#PBF and MP2451DT-LF-Z, the LT3693IMSE#PBF uniquely combines 3.5A capability, integrated boost diode, PG flag, and wide-frequency programmability - making it optimal for mid-power industrial and automotive buck designs requiring robustness and design flexibility.
Availability
LT3693IMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supply, and portable product power applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant lead-free finish.
Supply support for LT3693IMSE#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 industrial, automotive, communications, and healthcare markets.
The LT3693IMSE#PBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for rugged, wide-input industrial and automotive power conversion where reliability, thermal performance, and integration of bias circuitry are critical.
FAQ
What is the maximum input voltage rating for LT3693IMSE#PBF?
The absolute maximum input voltage (VIN) for LT3693IMSE#PBF is 36V, and the BOOST pin withstands up to 56V. In normal regulation, input transients up to 36V are acceptable regardless of switching frequency. During startup or overload, maximum safe VIN depends on fSW and minimum on-time - e.g., at 2.4MHz, max VIN drops to ~24V to avoid violating tON(MIN) ≈ 150ns. Always verify with the VINMAX equation in the Applications Information section of the LT3693IMSE#PBF datasheet.
Does LT3693IMSE#PBF require an external boost diode?
No - the LT3693IMSE#PBF integrates a boost Schottky diode connected to the BD pin, eliminating the need for an external diode. However, an external boost capacitor (typically 10nF–100nF) must still be placed between BOOST and SW pins to generate the required gate-drive voltage above VIN for the internal NPN switch. This integration reduces component count and improves reliability in space-constrained layouts.
How is the output voltage programmed on LT3693IMSE#PBF?
The LT3693IMSE#PBF uses a precision 0.790V feedback reference at the FB pin. Output voltage is set via a resistive divider: R1 connects from VOUT to FB, and R2 connects from FB to GND. The formula is VOUT = 0.790V × (1 + R1/R2). For example, to achieve 5.0V output, use R2 = 10kΩ and R1 = 53.4kΩ (1% tolerance). Layout best practices require short, direct traces from FB to the divider and tight coupling to minimize noise injection.
What thermal considerations apply to LT3693IMSE#PBF in MSOP package?
The LT3693IMSE#PBF in 10-lead MSOP has an exposed pad (Pin 11) that must be soldered to a PCB copper pour tied to GND for effective thermal dissipation. With θJA = 45°C/W and θJC = 10°C/W, achieving full 3.5A output at 85°C ambient requires ≥2 cm² of 2-oz copper connected to the pad. Thermal shutdown activates at ~165°C junction temperature; derate output current if PCB copper area or airflow is insufficient to maintain TJ < 125°C under worst-case load.
Can LT3693IMSE#PBF synchronize to an external clock?
Yes - the LT3693IMSE#PBF supports external clock synchronization via the SYNC pin (Pin 6), accepting TTL/CMOS-compatible signals from 250kHz to 2MHz. This allows noise-sensitive systems (e.g., RF modules or audio circuits) to align switching edges outside critical frequency bands. When unused, SYNC must be tied to GND - leaving it floating may cause erratic operation. The internal oscillator remains active and defaults to RT-set frequency if SYNC is inactive or out-of-range.
LT3693IMSE#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
LT3693IMSE#PBF FAQ
1.How can I place an order for LT3693IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3693IMSE#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 LT3693IMSE#PBF reliable?
The price and inventory of LT3693IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3693IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3693IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3693IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3693IMSE#PBF?
LT3693IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3693IMSE#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 LT3693IMSE#PBF?
For technical support, including LT3693IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3693IMSE#PBF requirements.
6.How does Aetrix verify that LT3693IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3693IMSE#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 LT3693IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3693IMSE#PBF?
All LT3693IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3693IMSE#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 LT3693IMSE#PBF part is unused and in its original packaging.
Return procedure for LT3693IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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