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Analog Devices Inc. LT3695IMSE-5#PBF
- Part No.:
- LT3695IMSE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695IMSE-5#PBF.pdf
- Description:
- IC REG BUCK 5V 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,295
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Product details
Overview
LT3695IMSE-5#PBF from Analog Devices (formerly Linear Technology) is a fault-tolerant 5V fixed-output monolithic buck switching regulator with 1A output current, 3.6V–36V input range, and 60V transient tolerance. It features low-ripple Burst Mode operation (<15mVP-P), adjustable frequency (250kHz–2.2MHz), power good flag, and thermal/short-circuit protection. Used in automotive battery regulation and industrial distributed supplies where robustness under voltage transients is critical.
For engineers reviewing the LT3695IMSE-5#PBF datasheet, LT3695IMSE-5#PBF pinout, LT3695IMSE-5#PBF application, or LT3695IMSE-5#PBF equivalent, key selection considerations include its FMEA-compliant fault tolerance (output remains ≤5V during adjacent pin shorts or floating pins), 75μA no-load quiescent current at 12VIN/5VOUT, and MSOP-16 thermally enhanced package with exposed pad.
Technical Context
The LT3695IMSE-5#PBF employs current-mode control for fast transient response and stable loop behavior across wide input ranges. Its internal bipolar NPN switch is driven via a BOOST capacitor to ensure full saturation, enabling high efficiency even at high duty cycles.
Fault tolerance is implemented through hardware-level pin-fault detection: open or shorted NC pins (3, 10, 12), floating RUN/SS, or adjacent pin shorts do not cause overvoltage at VOUT. Frequency foldback and DA-pin current sensing provide overload protection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% (guaranteed over –40°C to 125°C junction) |
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V/1s non-repetitive transients |
| Max Output Current | 1.0A (minimum guaranteed at TJ ≤ 125°C with proper thermal design) |
| Quiescent Current | 75μA typical at 12VIN/5VOUT in Burst Mode, <1μA in shutdown |
| Switching Frequency | Adjustable 250kHz–2.2MHz via RT resistor; supports external sync up to 2.2MHz |
| Output Ripple | <15mVP-P in Burst Mode (typical application, 10μH inductor, 10μF output cap) |
| Protection Features | Thermal shutdown, frequency foldback, short-circuit protection, overvoltage lockout (38V typ) |
Pinout & Package
LT3695IMSE-5#PBF is housed in a 16-lead plastic MSOP package with exposed thermal pad (Pin 17). The exposed pad must be soldered to PCB for θJA = 40°C/W; unsoldered pad yields θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power ground for catch diode return path | Must connect to local power ground plane; exposed pad (17) is electrically tied to PGND and critical for thermal performance |
| DA (2) | Catch diode anode sense input | Monitors diode current to trigger frequency foldback during overload; connects to Schottky diode anode |
| NC (3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to preserve FMEA fault tolerance |
| SW (4) | Internal switch 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 regulator; RC network here sets output voltage ramp rate during startup |
| RT (6) | Oscillator frequency setting | Resistor to ground programs switching frequency (e.g., 40.2kΩ = 800kHz) |
| SYNC (7) | External clock synchronization input | Accepts 300kHz–2.2MHz clock; grounding via 100kΩ enables low-ripple Burst Mode |
| VIN (8) | Main input supply | Supplies internal bias circuitry and power switch; requires local ceramic bypass capacitor |
| VC (9) | Error amplifier output | Controls peak switch current; external compensation network connects here for loop stability |
| PG (11) | Power good open-collector flag | Active-low signal asserts when output reaches 90% of 5V (4.5V); requires external pull-up |
| GND (14) | Analog ground reference | Reference for internal circuitry; tie directly to clean analog ground plane, separate from PGND if possible |
| OUT1/OUT2 (13, 14) | Fixed 5V output and feedback node | Internally connected to 5V regulation resistors; output load connects here; also supplies bias current to internal regulator |
| BOOST (16) | Bootstrap drive for NPN switch | Capacitor between BOOST and SW generates >VIN voltage to fully saturate internal switch |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-compliant fault tolerance | Output remains ≤5V during adjacent pin shorts or floating RUN/SS/NC pins-no external supervision required |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while achieving 75μA IQ, eliminating need for external LDO post-regulation |
| Transient-hardened input stage | Withstands 60V/1s transients and includes overvoltage lockout (38V typ) that halts switching without latch-up |
| Integrated bias management | Auto-selects power source: draws from VIN, BD, or OUT1/2 depending on highest available ≥3V supply-improves light-load efficiency |
| Robust short-circuit protection | Combines switch current limit (1.45A min), DA-pin foldback, and thermal shutdown-survives sustained output shorts |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Powering infotainment head units and ADAS sensors from 12V vehicle battery subject to load dump (60V) and cold-crank (3.6V) conditions. IC Role / Device Role / Timing Role: Primary 5V buck regulator providing stable, fault-tolerant rail with integrated power good signaling for system sequencing. Use Value: Eliminates need for external TVS and pre-regulator stages; maintains regulated 5V output during pin faults common in high-vibration harness environments. |
Use Scenario: Generating local 5V rails for PLC I/O modules and fieldbus gateways operating from 24V industrial supplies. IC Role / Device Role / Timing Role: Compact, thermally efficient DC-DC converter with programmable frequency to avoid noise-sensitive bands (e.g., CAN FD). Use Value: MSOP-16 package with exposed pad enables high-power density on space-constrained PCBs; SYNC pin allows EMI reduction via spread-spectrum clocking. |
| Point-of-Load Conversion | Harsh-Environment Telematics |
Use Scenario: Converting 12V/24V intermediate bus to 5V for microcontrollers and communication ICs in factory automation equipment. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with soft-start (via RUN/SS RC) preventing inrush into downstream capacitive loads. Use Value: 75μA Burst Mode IQ extends standby time in battery-backed systems; PG flag enables safe processor wake-up sequencing. |
Use Scenario: Powering GPS/GSM modules in fleet tracking devices mounted in engine compartments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Temperature-rated (–40°C to 125°C) 5V regulator with thermal shutdown and frequency foldback for reliable operation under thermal stress. Use Value: Guaranteed performance across full junction range eliminates derating calculations; fault tolerance prevents system resets due to connector contamination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3695EMSE-5#PBF | Same electrical specs but rated for 0°C to 125°C junction (vs. –40°C to 125°C for LT3695IMSE-5#PBF) | Not suitable for extended cold-temperature operation (e.g., outdoor telematics, automotive cabin) | Select LT3695IMSE-5#PBF for designs requiring guaranteed operation below 0°C ambient. |
| LT3695HMSE-5#PBF | Same electrical specs with extended junction rating (–40°C to 150°C) and higher thermal limits | Targeted at under-hood automotive or high-ambient industrial applications where board temperatures exceed 125°C | Choose LT3695HMSE-5#PBF only if thermal modeling confirms junction >125°C; otherwise LT3695IMSE-5#PBF offers optimal cost/performance. |
Compared with LT3695EMSE-5#PBF and LT3695HMSE-5#PBF, the LT3695IMSE-5#PBF uniquely balances extended low-temperature capability (–40°C) with standard industrial thermal margin (125°C), making it the default choice for automotive and industrial applications requiring guaranteed cold-start performance without over-specifying for extreme heat.
Availability
LT3695IMSE-5#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supply, and harsh-environment telematics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3695IMSE-5#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 portfolio of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LT3695 series was designed specifically for fault-tolerant DC-DC conversion in automotive and industrial systems where input transients, connector faults, and thermal extremes demand hardware-level reliability beyond standard buck regulators.
FAQ
What is the guaranteed operating temperature range for the LT3695IMSE-5#PBF?
The LT3695IMSE-5#PBF is guaranteed to operate over a junction temperature range of –40°C to 125°C. This specification is validated per Linear Technology's characterization and statistical process controls, ensuring reliable performance in automotive cabin and industrial control environments where ambient temperatures vary widely.
Does the LT3695IMSE-5#PBF require external feedback resistors to set the 5V output?
No, the LT3695IMSE-5#PBF integrates internal feedback resistors for its fixed 5V output. Unlike the adjustable LT3695 variant, it uses OUT1 and OUT2 pins as both output terminals and internal regulation nodes-no external resistor divider is needed or supported for this part number.
How does the LT3695IMSE-5#PBF achieve fault tolerance during adjacent pin shorts?
The LT3695IMSE-5#PBF achieves FMEA-compliant fault tolerance by hardwiring critical functions to dedicated pins and isolating NC pins. If pins 3, 10, or 12 are shorted to adjacent signals-or left floating-the internal regulation loop remains unaffected, guaranteeing the output stays at or below 5V without external supervision.
What is the minimum input voltage required for the LT3695IMSE-5#PBF to regulate 5V output?
The LT3695IMSE-5#PBF requires a minimum input voltage of 3.6V to maintain 5V regulation under all conditions. Below this threshold, internal bias circuitry cannot sustain regulation-this value is confirmed across the full –40°C to 125°C temperature range and is independent of switching frequency.
Can the LT3695IMSE-5#PBF synchronize to an external clock, and what is the supported frequency range?
Yes, the LT3695IMSE-5#PBF supports external clock synchronization via its SYNC pin across a range of 300kHz to 2.2MHz. Clock edges must have rise/fall times faster than 1μs. When synchronized, the device maintains its specified output accuracy and protection features without degradation.
LT3695IMSE-5#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):
- 5V
- 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-5#PBF FAQ
1.How can I place an order for LT3695IMSE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695IMSE-5#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 LT3695IMSE-5#PBF reliable?
The price and inventory of LT3695IMSE-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3695IMSE-5#PBF is usually 5 days.
3.What payment methods are accepted for LT3695IMSE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695IMSE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695IMSE-5#PBF?
LT3695IMSE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695IMSE-5#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 LT3695IMSE-5#PBF?
For technical support, including LT3695IMSE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695IMSE-5#PBF requirements.
6.How does Aetrix verify that LT3695IMSE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3695IMSE-5#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 LT3695IMSE-5#PBF meets industry standards.
7.What is the process for return or replacement of LT3695IMSE-5#PBF?
All LT3695IMSE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695IMSE-5#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 LT3695IMSE-5#PBF part is unused and in its original packaging.
Return procedure for LT3695IMSE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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