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Analog Devices Inc. LT3695EMSE-3.3#TRPBF
- Part No.:
- LT3695EMSE-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695EMSE-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,312
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Product details
Overview
LT3695EMSE-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a fault-tolerant 1A monolithic buck switching regulator with fixed 3.3V output, 3.6V–36V input range, and 60V transient tolerance. It features low-ripple Burst Mode operation (<15mVP-P), 75μA no-load quiescent current, and integrated power-good flag. It is used in automotive battery regulation and industrial distributed supplies where robustness against pin faults and transients is critical.
For engineers reviewing the LT3695EMSE-3.3#TRPBF datasheet, LT3695EMSE-3.3#TRPBF pinout, LT3695EMSE-3.3#TRPBF application, or LT3695EMSE-3.3#TRPBF equivalent, key selection criteria include its FMEA-compliant adjacent-pin-short tolerance, 3.3V fixed output accuracy (±1%), thermal shutdown, frequency foldback under overload, and compatibility with external synchronization up to 2.2MHz.
Technical Context
The LT3695EMSE-3.3#TRPBF employs current-mode control with an internal 0.8V reference for feedback (via internal resistor divider), enabling fast transient response and stable loop behavior. Its oscillator supports adjustable frequency (250kHz–2.2MHz) via RT pin resistor, and includes SYNC input for external clock alignment or mode selection between Burst Mode and PWM.
Fault tolerance is implemented through hardware-level detection: open or shorted pins (e.g., NC pins, RUN/SS, FB) do not cause overvoltage at the output. Protection includes switch current limiting (1.45A typical), DA-pin-based catch-diode current sensing for frequency foldback, thermal shutdown, and overvoltage lockout (38V typical) that disables switching during 60V transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (guaranteed over –40°C to 125°C junction temp) |
| Input Voltage Range | 3.6V to 36V continuous; withstands non-repetitive 60V/1s transients |
| Max Output Current | 1A (derated above 125°C; limited by thermal design and minimum off-time) |
| Quiescent Current | 75μA typical at 12VIN→3.3VOUT, no load, Burst Mode enabled |
| Switching Frequency | Adjustable 250kHz–2.2MHz via RT pin; synchronizable 300kHz–2.2MHz via SYNC pin |
| Output Ripple | <15mVP-P in typical Burst Mode application (10μH inductor, 10μF output cap) |
| Power Good Flag | Open-collector PG pin asserts high when OUT1/OUT2 reaches 90% of 3.3V (±50mV hysteresis) |
Pinout & Package
LT3695EMSE-3.3#TRPBF is housed in a thermally enhanced 16-pin MSOP package with exposed pad (Pin 17) for improved heat dissipation (θJA = 40°C/W when soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power ground return for catch diode | Must be connected to PCB ground plane; exposed pad (17) must be soldered for thermal performance |
| DA (2) | Catch diode anode sense input | Monitors diode current to trigger frequency foldback during overload or short-circuit |
| NC (3, 10, 15) | No-connect terminals | Internally unconnected; must remain floating to preserve FMEA fault tolerance |
| SW (4) | Internal switch drain node | Connects to inductor, boost capacitor, and cathode of external Schottky catch diode |
| RUN/SS (5) | Enable and soft-start control | ≥2.5V enables regulator; RC network here sets output voltage ramp rate during startup |
| RT (6) | Oscillator frequency set resistor | Resistor to GND programs switching frequency (e.g., 40.2kΩ = 800kHz) |
| SYNC (7) | External clock synchronization input | Ground via 100kΩ for Burst Mode; ≥0.8V for pulse-skipping; external clock for sync |
| VIN (8) | Main input supply | Bypass locally with ceramic capacitor; powers internal bias circuitry unless BD/OUT active |
| VC (9) | Error amplifier output | Controls peak switch current; external compensation network connects here to GND |
| PG (11) | Power good open-collector output | Pulled high externally; goes low when output drops below 90% of 3.3V |
| GND (12) | Analog ground reference | Return for internal control circuitry; tie directly to local ground plane |
| OUT1/OUT2 (13, 14) | Fixed 3.3V output and feedback nodes | Internally connected to output; provide bias to internal regulator and define regulated voltage |
| BOOST (16) | Bootstrap drive voltage | Capacitor (0.22μF typical) between BOOST and SW enables full saturation of NPN switch |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-compliant pin fault tolerance | Output remains ≤3.3V even if adjacent pins are shorted or any NC/RUN/SS pin floats |
| Low-ripple Burst Mode operation | Maintains <15mVP-P ripple while achieving 75μA no-load IQ - critical for always-on systems |
| 60V transient survivability | Overvoltage lockout disables switching above ~38V, allowing safe handling of 60V/1s automotive load-dump events |
| Integrated power-good signaling | PG pin provides system-level status without external monitoring circuitry - simplifies sequencing |
| Thermal and current protection | Combines thermal shutdown, switch current limit (1.45A), and DA-pin foldback for robust short-circuit recovery |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Powering infotainment head units and ADAS sensors from 12V vehicle battery subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing clean, fault-tolerant power with built-in 60V transient protection and PG signaling for MCU reset coordination. Use Value: Eliminates need for external TVS and discrete enable/PG logic; maintains regulation during ISO 7637-2 Pulse 5a (60V/100ms) events. | Use Scenario: Local 3.3V rail generation for PLC I/O modules operating in harsh factory environments with wide input variation. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter delivering 1A with programmable frequency to avoid noise-sensitive bands and support compact layout. Use Value: Reduces BOM count vs. adjustable regulators; FMEA compliance ensures safety integrity in SIL2-capable systems. |
| Automotive Entertainment Systems | Distributed Supply Regulation |
Use Scenario: Powering USB-C PD controllers and display timing ICs in rear-seat entertainment systems with variable battery voltage. IC Role / Device Role / Timing Role: High-efficiency 3.3V supply with Burst Mode for standby and PWM for active video/audio processing. Use Value: Achieves >85% efficiency at 10mA load and >90% at 500mA - extends runtime in battery-backed systems. | Use Scenario: Point-of-load conversion in telecom base station backplanes where space and reliability are constrained. IC Role / Device Role / Timing Role: Fault-tolerant 1A buck regulator with SYNC input for EMI reduction via spread-spectrum clock alignment. Use Value: Enables deterministic noise shaping across multiple rails; eliminates single-point failure from pin shorts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE-3.3#TRPBF | Same 16-pin MSOP, 3.3V fixed output, but uses constant-on-time architecture; lower IQ (25μA), no SYNC pin | Superior light-load efficiency but lacks synchronization and Burst Mode ripple control | Select when ultra-low IQ dominates over EMI control or transient response speed |
| TPS54332DR | 3.5V–28V input, 3.3V fixed, 3A output; SOIC-8 package; no fault tolerance or 60V transient rating | Higher current capability but requires external PG and TVS; unsuitable for automotive transients | Select for cost-sensitive industrial apps where input stays <28V and fault tolerance is not required |
Compared with LTC3630EMSE-3.3#TRPBF and TPS54332DR, LT3695EMSE-3.3#TRPBF uniquely combines 60V transient survival, FMEA-compliant pin fault tolerance, and synchronized low-ripple Burst Mode - making it irreplaceable in automotive and safety-critical distributed supplies.
Availability
LT3695EMSE-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supplies, and automotive entertainment systems requiring stable component supply across extended temperature and transient conditions.
Supply support for LT3695EMSE-3.3#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 and maintains its high-reliability analog and power management portfolio.
The LT3695 series was designed specifically for automotive and industrial applications demanding fault tolerance, wide input range, and transient robustness - with LT3695EMSE-3.3#TRPBF targeting 3.3V systems needing guaranteed 1A output under harsh electrical conditions.
FAQ
What is the maximum input voltage LT3695EMSE-3.3#TRPBF can safely handle?
The LT3695EMSE-3.3#TRPBF operates continuously up to 36V input and is rated to safely withstand non-repetitive 60V transients for up to 1 second. Its overvoltage lockout activates at ~38V (typical), halting switching to protect internal circuitry while allowing the output to decay gracefully. This makes LT3695EMSE-3.3#TRPBF suitable for automotive load-dump scenarios per ISO 7637-2.
Does LT3695EMSE-3.3#TRPBF require an external feedback resistor network?
No. LT3695EMSE-3.3#TRPBF integrates internal feedback resistors calibrated for a precise 3.3V output; the FB pin is not used. Instead, OUT1 and OUT2 pins connect directly to the output and serve as both power outputs and internal regulation references. External resistors are only needed for adjustable versions like LT3695EMSE#TRPBF.
How does the DA pin function in LT3695EMSE-3.3#TRPBF protection?
The DA pin monitors current through the external Schottky catch diode. When sensed current exceeds ~1.6A, LT3695EMSE-3.3#TRPBF initiates frequency foldback - reducing switching frequency to limit inductor peak current during overload or short-circuit. This complements the main switch current limit (1.45A) and prevents thermal runaway without requiring external current-sense components.
Can LT3695EMSE-3.3#TRPBF be synchronized to an external clock?
Yes. The SYNC pin accepts external clock signals from 300kHz to 2.2MHz with rise/fall times <1μs. When driven by an external source, LT3695EMSE-3.3#TRPBF locks its switching edge to the clock, enabling EMI reduction via frequency alignment across multiple converters. Grounding SYNC via 100kΩ enables low-ripple Burst Mode; applying ≥0.8V selects pulse-skipping mode.
What thermal considerations apply to LT3695EMSE-3.3#TRPBF in 1A operation?
At 1A output and 12V input, LT3695EMSE-3.3#TRPBF dissipates ~0.5W. Its 16-pin MSOP package achieves θJA = 40°C/W only when the exposed pad (Pin 17) is soldered to a minimum 100mm² copper area. Without pad soldering, θJA degrades to 110°C/W - risking thermal shutdown above 75°C ambient. Layout must prioritize PGND/GND plane connectivity and BOOST/SW loop minimization.
LT3695EMSE-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 250kHz ~ 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3695EMSE-3.3#TRPBF FAQ
1.How can I place an order for LT3695EMSE-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695EMSE-3.3#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 LT3695EMSE-3.3#TRPBF reliable?
The price and inventory of LT3695EMSE-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3695EMSE-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3695EMSE-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695EMSE-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695EMSE-3.3#TRPBF?
LT3695EMSE-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695EMSE-3.3#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 LT3695EMSE-3.3#TRPBF?
For technical support, including LT3695EMSE-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695EMSE-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3695EMSE-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3695EMSE-3.3#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 LT3695EMSE-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3695EMSE-3.3#TRPBF?
All LT3695EMSE-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695EMSE-3.3#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 LT3695EMSE-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3695EMSE-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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