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Analog Devices Inc. LT3695IMSE-3.3#TRPBF
- Part No.:
- LT3695IMSE-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695IMSE-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,512
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Product details
Overview
LT3695IMSE-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. Used in automotive battery regulation and industrial distributed supplies where robustness against pin faults and voltage transients is critical.
For engineers reviewing the LT3695IMSE-3.3#TRPBF datasheet, LT3695IMSE-3.3#TRPBF pinout, LT3695IMSE-3.3#TRPBF application, or LT3695IMSE-3.3#TRPBF equivalent, key selection criteria include its FMEA-compliant adjacent-pin-short tolerance, thermally enhanced 16-pin MSOP package with exposed pad, 3.3V ±1% output accuracy over –40°C to 125°C, and synchronization capability from 300kHz to 2.2MHz.
Technical Context
The LT3695IMSE-3.3#TRPBF employs current-mode control for fast transient response and loop stability, with internal slope compensation and frequency foldback during overload. Its bipolar NPN power switch is driven via an integrated boost circuit (BOOST/SW capacitor), enabling full saturation at high input voltages.
Fault tolerance is implemented through hardware-level detection of adjacent pin shorts or floating pins-ensuring output never exceeds 3.3V under such conditions. The device integrates soft-start via RUN/SS RC ramping, thermal shutdown, short-circuit protection via DA-pin current sensing, and overvoltage lockout (38V typical) for 60V transient survival.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (3.27V–3.33V) over full temperature and line/load range - ensures stable logic supply without external feedback resistors. |
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V non-repetitive transients - supports 12V/24V automotive and industrial rails with surge immunity. |
| Max Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Quiescent Current | 75μA at 12VIN→3.3VOUT, no load - enables always-on systems with multi-year battery life in low-power modes. |
| Switching Frequency | Adjustable 250kHz–2.2MHz via RT resistor - allows optimization of inductor size (e.g., 10μH @ 800kHz) vs. efficiency trade-offs. |
| Output Ripple | <15mVP-P in Burst Mode - meets noise-sensitive analog and RF subsystem requirements without additional filtering. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial control environments. |
Pinout & Package
LT3695IMSE-3.3#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17), offering θJA = 40°C/W when soldered to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power ground return for catch diode | Must be connected to low-impedance ground plane; exposed pad improves thermal performance and reduces EMI. |
| DA (2) | Catch diode anode sense input | Monitors diode current to trigger frequency foldback during overload or short-circuit - prevents inductor saturation. |
| NC (3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to preserve FMEA fault tolerance - bridging or grounding invalidates safety guarantee. |
| SW (4) | Internal switch node | Connects to inductor, catch diode cathode, and BOOST capacitor - high dv/dt node requiring tight layout and ground shielding. |
| RUN/SS (5) | Enable and soft-start control | Logic-high (>2.5V) enables regulation; RC network here sets controlled VOUT ramp rate - eliminates inrush current. |
| RT (6) | Oscillator frequency set resistor | Grounded resistor sets switching frequency (e.g., 40.2kΩ = 800kHz); open or short causes undefined operation. |
| SYNC (7) | External clock synchronization input | Accepts 300kHz–2.2MHz clock; grounded via 100kΩ enables low-ripple Burst Mode - critical for EMI-sensitive applications. |
| VIN (8) | Main input power supply | Supplies internal bias and switch driver; requires local 10μF ceramic bypass near pin - failure causes immediate shutdown. |
| VC (9) | Error amplifier output | Controls peak switch current; external compensation network (R+C) stabilizes loop - improper design causes instability or poor transient response. |
| FB (11) | Feedback reference (not used in -3.3 variant) | Not connected internally for LT3695IMSE-3.3#TRPBF - fixed-output version uses internal divider; leaving floating has no effect. |
| PG (13) | Open-collector power-good flag | Active-low signal asserts when VOUT reaches 90% of 3.3V - used for system sequencing and fault monitoring. |
| GND (14) | Analog ground reference | Reference for internal circuitry; separate from PGND but tied at single point - avoids noise coupling into error amplifier. |
| OUT1/OUT2 (13,14) | Output voltage and internal bias source | Deliver regulated 3.3V and supply internal regulator - must connect directly to output capacitor; routing affects load regulation. |
| BD (15) | Bias diode anode (not used in -3.3 variant) | Unused in fixed-output versions; must be left floating - connecting risks internal regulator conflict and reduced efficiency. |
| BOOST (16) | Boost capacitor connection | Connects to SW via 0.22μF capacitor - generates >VIN voltage to saturate bipolar switch; missing cap causes high conduction loss. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA fault tolerance | Guaranteed output ≤3.3V during adjacent pin shorts or floating NC pins - eliminates need for external fault-monitoring circuitry in safety-critical systems. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while drawing only 75μA - preserves signal integrity in sensor front-ends without sacrificing standby efficiency. |
| 60V transient survival | Withstands 60V/1s transients without latch-up or damage - meets ISO 7637-2 Pulse 1/2/5a requirements for automotive electronics. |
| Integrated power-good flag | PG pin asserts after VOUT stabilizes within 10% of 3.3V - enables reliable processor reset sequencing and system-level health monitoring. |
| Thermally enhanced MSOP | 16-pin MSOP with exposed pad achieves θJA = 40°C/W - supports 1A operation at +125°C ambient without heatsink in compact layouts. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Powering infotainment head units from 12V vehicle battery subject to load-dump transients up to 60V. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing clean, fault-tolerant power to SoC and audio codecs. Use Value: Eliminates need for external TVS and redundancy circuits due to built-in 60V transient tolerance and pin-fault immunity. | Use Scenario: Local 3.3V supply for PLC I/O modules operating in harsh factory environments with wide input voltage variation. IC Role / Device Role / Timing Role: Isolated point-of-load regulator delivering stable 3.3V to isolated RS-485 transceivers and ADCs. Use Value: Maintains regulation down to 3.6V input and survives brownouts common in industrial 24V systems. |
| Automotive Entertainment Systems | Distributed Supply Regulation |
Use Scenario: Powering rear-seat display controllers where space constraints prohibit large inductors and capacitors. IC Role / Device Role / Timing Role: Compact 3.3V supply enabling high-frequency switching (2MHz) to shrink magnetics by >50%. Use Value: Achieves 1A output in <100mm² PCB area using 4.7μH inductor - critical for slim-profile displays. | Use Scenario: Secondary 3.3V rail in telecom base station cards requiring low-noise, always-on power for clock buffers. IC Role / Device Role / Timing Role: Low-ripple Burst Mode regulator supplying jitter-sensitive timing ICs during sleep cycles. Use Value: Delivers <15mVP-P ripple at 100μA load - prevents phase noise degradation in PLL-based clock generators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIV#TRPBF | 42V input, 2A output, Silent Switcher architecture; higher cost, smaller solution size, lower EMI. | Preferred for ultra-low EMI environments (e.g., medical imaging); not pin-compatible. | Select when EMI compliance (CISPR 25 Class 5) is mandatory and board space is premium. |
| TPS54332DDAR | 28V input, 3A output, external compensation; lower quiescent current (14μA), no fault tolerance. | Suitable for cost-sensitive industrial supplies where transients <40V and pin faults are not safety-critical. | Choose for higher current needs and lower IQ where FMEA compliance is unnecessary. |
Compared with LT8609SIV#TRPBF and TPS54332DDAR, the LT3695IMSE-3.3#TRPBF uniquely delivers guaranteed 3.3V output fidelity under adjacent-pin faults and 60V transients - making it irreplaceable in ASIL-B automotive modules where functional safety is enforced at the component level.
Availability
LT3695IMSE-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 ranges and long production lifecycles.
Supply support for LT3695IMSE-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3695 series was designed specifically for fault-tolerant DC/DC conversion in automotive and industrial environments where reliability under electrical stress - including pin shorts, transients, and thermal extremes - is non-negotiable.
FAQ
What is the guaranteed output voltage accuracy of the LT3695IMSE-3.3#TRPBF over temperature and line/load conditions?
The LT3695IMSE-3.3#TRPBF delivers a fixed 3.3V output with ±1% accuracy (3.27V to 3.33V) across –40°C to +125°C junction temperature, 3.6V–36V input, and 0–1A load. This is achieved via laser-trimmed internal feedback resistors - eliminating drift from external component tolerances and ensuring consistent logic-level compatibility in demanding environments.
Does the LT3695IMSE-3.3#TRPBF require external feedback resistors to set the output voltage?
No. The LT3695IMSE-3.3#TRPBF is a fixed-output variant with internal resistor divider network calibrated for 3.3V. The FB pin is unused and must remain unconnected. External resistors are only required for adjustable versions like the base LT3695 - using them with LT3695IMSE-3.3#TRPBF would disrupt regulation and potentially damage the device.
How does the LT3695IMSE-3.3#TRPBF achieve fault tolerance during adjacent pin shorts?
The LT3695IMSE-3.3#TRPBF implements hardware-level fault detection that monitors pin states in real time. If an adjacent pin short occurs (e.g., SW-to-GND or VIN-to-PG), internal circuitry clamps the VC pin and forces the switch off - preventing any condition where the output could exceed 3.3V. This behavior is guaranteed per AEC-Q100 stress testing and requires no firmware or external supervision.
Can the LT3695IMSE-3.3#TRPBF synchronize to an external clock, and what is the supported frequency range?
Yes. The SYNC pin accepts external clock signals from 300kHz to 2.2MHz with rise/fall times <1μs. When synchronized, the LT3695IMSE-3.3#TRPBF maintains tight frequency alignment and phase coherence - essential for reducing beat frequencies in multi-rail systems. Grounding SYNC via 100kΩ enables low-ripple Burst Mode, while driving it above 0.8V selects pulse-skipping mode.
What thermal performance can be expected from the LT3695IMSE-3.3#TRPBF in a standard 2-layer PCB layout?
With the exposed pad (Pin 17) soldered to ≥2cm² of 1oz copper on a 2-layer board, the LT3695IMSE-3.3#TRPBF achieves θJA ≈ 40°C/W. At 1A load and 12VIN→3.3VOUT, power dissipation is ~1.5W, resulting in ~60°C junction rise above ambient - well within the –40°C to +125°C rating. Omitting the exposed pad increases θJA to 110°C/W, risking thermal shutdown above 60°C ambient.
LT3695IMSE-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
LT3695IMSE-3.3#TRPBF FAQ
1.How can I place an order for LT3695IMSE-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695IMSE-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 LT3695IMSE-3.3#TRPBF reliable?
The price and inventory of LT3695IMSE-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 LT3695IMSE-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3695IMSE-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695IMSE-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695IMSE-3.3#TRPBF?
LT3695IMSE-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695IMSE-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 LT3695IMSE-3.3#TRPBF?
For technical support, including LT3695IMSE-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695IMSE-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3695IMSE-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3695IMSE-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 LT3695IMSE-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3695IMSE-3.3#TRPBF?
All LT3695IMSE-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695IMSE-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 LT3695IMSE-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3695IMSE-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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