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Analog Devices Inc. LT3695EMSE-3.3#PBF
- Part No.:
- LT3695EMSE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695EMSE-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,456
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Product details
Overview
LT3695EMSE-3.3#PBF 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 at 12VIN/3.3VOUT, 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#PBF datasheet, LT3695EMSE-3.3#PBF pinout, LT3695EMSE-3.3#PBF application, or LT3695EMSE-3.3#PBF equivalent, this page delivers verified specifications including FMEA-compliant fault tolerance, thermal shutdown, frequency foldback, soft-start via RUN/SS, and MSOP-16 package compatibility for high-reliability embedded power designs.
Technical Context
The LT3695EMSE-3.3#PBF implements current-mode control with internal error amplifier (gm = 430μS, gain = 1300 V/V), oscillator programmable from 250kHz to 2.2MHz via RT resistor, and VC pin-based peak-current regulation. Its architecture includes dedicated DA-pin current sensing for catch-diode-based frequency foldback and thermal shutdown protection.
It supports three operating modes: standard PWM (via SYNC ≥0.8V), low-ripple Burst Mode (SYNC grounded), and external clock synchronization (SYNC driven). The fixed 3.3V output is internally regulated via precision feedback resistors (FB voltage = 0.8V reference), eliminating external divider components while maintaining ±1% output accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (3.27V–3.33V) - eliminates external feedback resistors and improves accuracy vs. adjustable variants. |
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V/1s transients - enables direct connection to 12V/24V automotive and industrial rails without pre-regulation. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in compact systems. |
| Quiescent Current | 75μA typical at 12VIN/3.3VOUT in Burst Mode - extends battery life in always-on monitoring applications. |
| Switching Frequency | Adjustable 250kHz–2.2MHz via RT resistor - allows trade-off between inductor size (e.g., 10μH @ 800kHz) and efficiency. |
| Output Ripple | <15mVP-P in Burst Mode - meets noise-sensitive analog and RF supply requirements without additional filtering. |
| Power Good Flag | Open-collector PG pin asserting when output reaches 90% of 3.3V - provides system-level power sequencing and fault detection. |
Pinout & Package
LT3695EMSE-3.3#PBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (θJA = 40°C/W when soldered). Pin functions are validated per Linear Technology datasheet 3695fa (Rev. 2012).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power ground for catch diode return path | Must be connected to PCB ground plane; exposed pad soldering required for thermal performance. |
| DA (2) | Catch diode anode sense input | Enables frequency foldback during overload by monitoring diode current; protects against short-circuit conditions. |
| NC (3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to preserve FMEA fault tolerance (adjacent pin shorts do not raise VOUT). |
| SW (4) | Internal switch drain node | Connects to inductor, boost capacitor, and catch diode cathode; carries high di/dt switching current. |
| RUN/SS (5) | Enable and soft-start control | Logic-high (>2.5V) enables regulation; RC network here sets output voltage ramp rate during startup. |
| RT (6) | Oscillator frequency programming | Resistor to ground sets switching frequency (e.g., 40.2kΩ → 800kHz); determines inductor/capacitor sizing. |
| SYNC (7) | External clock synchronization input | Ground for Burst Mode; ≥0.8V for pulse-skipping; driven clock for EMI reduction and multi-rail coherence. |
| VIN (8) | Main input power supply | Accepts 3.6V–36V; includes overvoltage lockout (38V typ.) to survive 60V transients safely. |
| VC (9) | Error amplifier output | Controls peak switch current; external compensation network here stabilizes loop response. |
| PG (11) | Power good open-collector output | Asserts high (via external pull-up) when VOUT ≥ 2.97V; signals valid regulation to host controller. |
| GND (12) | Analog ground reference | Separate from PGND; connects to local ground plane for noise-sensitive internal circuitry. |
| OUT1 / OUT2 (13, 14) | Fixed 3.3V output and internal feedback tap | Delivers regulated 3.3V; also supplies bias to internal regulator when VOUT > 3V, improving light-load efficiency. |
| BOOST (16) | Bootstrap drive for NPN switch | Capacitor (0.22μF) between BOOST and SW generates >VIN voltage to fully saturate internal bipolar switch. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA fault tolerance | Output remains ≤3.3V during adjacent pin shorts or floating pins - eliminates risk of overvoltage damage to downstream loads. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while drawing only 75μA - avoids audible noise and meets strict analog supply specs. |
| 60V transient survival | Withstands non-repetitive 60V/1s input surges without latch-up or degradation - suitable for automotive cold-crank and load-dump environments. |
| Integrated power-good flag | PG pin asserts after VOUT reaches 90% of 3.3V with 50mV hysteresis - enables reliable system power sequencing and fault reporting. |
| Thermal shutdown & frequency foldback | Halts switching above safe junction temperature and reduces fSW during start-up/overload - prevents thermal runaway and limits inductor current. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
|
Use Scenario: Powering infotainment head units and ADAS sensors directly from 12V vehicle battery with cold-crank (4.5V) and load-dump (60V) immunity. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing stable, fault-tolerant power with transient suppression and power-good signaling. Use Value: Eliminates need for external TVS and pre-regulator stages; reduces BOM count and PCB area while meeting AEC-Q100 stress requirements. |
Use Scenario: Generating local 3.3V rails for PLC I/O modules and fieldbus gateways operating from 24V industrial supplies. IC Role / Device Role / Timing Role: Isolated point-of-load regulator delivering clean, sequenced power with thermal and short-circuit protection. Use Value: Enables compact, convection-cooled designs with no heatsink; supports long-term reliability in 85°C ambient environments. |
| Automotive Entertainment Systems | Distributed Sensor Networks |
|
Use Scenario: Supplying 3.3V to audio codecs and display controllers in rear-seat entertainment systems subject to vibration and EMI. IC Role / Device Role / Timing Role: Low-noise, synchronized buck converter supporting spread-spectrum mode via SYNC pin to reduce EMI peaks. Use Value: Meets CISPR-25 Class 5 radiated emissions limits without added shielding; Burst Mode ensures silent operation during standby. |
Use Scenario: Powering wireless sensor nodes (e.g., LoRaWAN, NB-IoT) deployed in remote locations with wide input voltage variation. IC Role / Device Role / Timing Role: High-efficiency, ultra-low-IQ DC-DC converter extending battery life in energy-constrained edge devices. Use Value: 75μA no-load current enables >10-year battery life in sleep-dominated duty cycles; 3.6V minimum VIN supports aging primary cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIV#PBF | 42V input, 2A output, Silent Switcher architecture; lower EMI but no FMEA pin-fault tolerance. | Lacks adjacent-pin-short immunity; requires external feedback for 3.3V; better for EMI-sensitive RF sections. | Select when ultra-low EMI is prioritized over fault tolerance; verify layout compliance with Silent Switcher guidelines. |
| TPS54332DDAR | 28V input, 3.5A output, 100% duty cycle capability; no 60V transient rating or integrated PG flag. | Higher current but less robust in automotive transients; requires external PG circuit and feedback divider. | Choose for cost-sensitive industrial supplies needing >1A; add external TVS and power-good comparator if needed. |
Compared with LT3695EMSE-3.3#PBF, LT8609SIV#PBF offers superior EMI performance but sacrifices FMEA-compliant fault tolerance, while TPS54332DDAR delivers higher current at lower cost but lacks transient survivability and integrated diagnostics-making LT3695EMSE-3.3#PBF optimal for safety-critical, transient-prone environments.
Availability
LT3695EMSE-3.3#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supply, and distributed sensor networks requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT3695EMSE-3.3#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 and maintains its high-reliability power management portfolio. Linear's legacy emphasizes precision, robustness, and application-specific integration for demanding analog and mixed-signal systems.
The LT3695 series was designed specifically for fault-tolerant, high-input-voltage DC-DC conversion in automotive and industrial settings-prioritizing transient resilience, pin-fault immunity, and seamless integration into safety-critical power architectures.
FAQ
What is the maximum input voltage transient that LT3695EMSE-3.3#PBF can safely withstand?
The LT3695EMSE-3.3#PBF is rated to safely withstand non-repetitive 60V transients for up to 1 second, per Absolute Maximum Ratings. During such events, its overvoltage lockout circuit disables switching to prevent damage, allowing the output to fall out of regulation temporarily while preserving device integrity. Continuous operation remains limited to 36V.
Does LT3695EMSE-3.3#PBF require external feedback resistors to set the 3.3V output?
No. The LT3695EMSE-3.3#PBF integrates precision internal feedback resistors calibrated for a fixed 3.3V output, eliminating external resistor dividers. This improves accuracy (±1%), reduces component count, and avoids drift from external resistor tolerances or temperature coefficients-unlike the adjustable LT3695 variant which uses the FB pin.
How does the FMEA fault tolerance of LT3695EMSE-3.3#PBF protect downstream circuits?
The LT3695EMSE-3.3#PBF guarantees that output voltage stays at or below 3.3V even during adjacent pin shorts (e.g., SW-to-GND) or floating pins (e.g., NC left unconnected). This behavior is verified in the datasheet and prevents overvoltage damage to sensitive loads like microcontrollers or communication ICs-critical for functional safety in automotive and industrial systems.
What is the purpose of the DA pin on LT3695EMSE-3.3#PBF, and how does it improve reliability?
The DA pin on LT3695EMSE-3.3#PBF senses current through the external catch diode. When valley current exceeds ~1.6A, it triggers frequency foldback-reducing switching frequency to limit inductor current during overload or short-circuit conditions. This complements thermal shutdown and switch current limiting, enhancing robustness in sustained fault scenarios without requiring external current-sense circuitry.
Can LT3695EMSE-3.3#PBF operate in Burst Mode with zero external components beyond the inductor and capacitors?
Yes. LT3695EMSE-3.3#PBF enters low-ripple Burst Mode automatically when the SYNC pin is grounded (e.g., via 100kΩ resistor), requiring no additional external components beyond the standard buck layout (inductor, input/output capacitors, boost capacitor, catch diode). This mode achieves 75μA no-load quiescent current and <15mVP-P ripple without extra control ICs or complex sequencing.
LT3695EMSE-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3695EMSE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695EMSE-3.3#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 LT3695EMSE-3.3#PBF reliable?
The price and inventory of LT3695EMSE-3.3#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LT3695EMSE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695EMSE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695EMSE-3.3#PBF?
LT3695EMSE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695EMSE-3.3#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 LT3695EMSE-3.3#PBF?
For technical support, including LT3695EMSE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695EMSE-3.3#PBF requirements.
6.How does Aetrix verify that LT3695EMSE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT3695EMSE-3.3#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 LT3695EMSE-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT3695EMSE-3.3#PBF?
All LT3695EMSE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695EMSE-3.3#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 LT3695EMSE-3.3#PBF part is unused and in its original packaging.
Return procedure for LT3695EMSE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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