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Analog Devices Inc. LT3695IMSE#TRPBF
- Part No.:
- LT3695IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,904
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Product details
Overview
LT3695IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a fault-tolerant, 1A monolithic buck switching regulator with adjustable frequency (250kHz–2.2MHz), 3.6V–36V input range, and 0.8V–20V programmable output voltage. It integrates a bipolar NPN power switch, boost diode, current-mode controller, and protection circuitry, and is used in automotive battery regulation and industrial distributed supplies where transient robustness and low-noise light-load operation are critical.
For engineers reviewing the LT3695IMSE#TRPBF datasheet, LT3695IMSE#TRPBF pinout, LT3695IMSE#TRPBF application, or LT3695IMSE#TRPBF equivalent, key selection considerations include its 60V transient tolerance, FMEA-compliant adjacent-pin-short immunity, <15mVP-P Burst Mode ripple, 75μA no-load quiescent current, and thermally enhanced 16-pin MSOP package with exposed pad.
Technical Context
The LT3695IMSE#TRPBF employs constant-frequency current-mode control with slope compensation for loop stability and fast transient response. Its internal error amplifier drives the VC pin to regulate peak switch current, while frequency foldback and DA-pin-based catch-diode current sensing provide overload and short-circuit protection without external components.
It supports three operating modes via the SYNC pin: low-ripple Burst Mode (SYNC ≤ 0.3V), pulse-skipping (SYNC ≥ 0.8V), or external clock synchronization (0.3–2.2MHz). The RUN/SS pin enables shutdown (<1μA IQ) and soft-start via external RC ramping, and the BD pin allows bias sourcing from >3V external rail to improve efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V nonrepetitive transients - enables direct connection to 24V/36V automotive or industrial rails without pre-regulation. |
| Output Current | 1A continuous - sufficient to power microcontrollers, sensors, and interface ICs in compact embedded systems. |
| Switching Frequency | 250kHz to 2.2MHz, set by RT resistor - allows trade-off between small magnetics (high fSW) and high VIN/VOUT ratio support (low fSW). |
| Burst Mode Ripple | <15mVP-P - maintains clean output under light loads without requiring external LDO post-regulation. |
| Quiescent Current | 75μA at 12VIN/3.3VOUT, no load - extends battery life in always-on automotive or IoT edge nodes. |
| Fault Tolerance | Output remains ≤ programmed VOUT during adjacent pin shorts or floating pins - satisfies ASIL-B functional safety requirements without additional monitoring circuitry. |
| Power Good Flag | Open-collector PG asserts when FB or output reaches 90% of regulation - provides reliable system reset sequencing and supply monitoring. |
Pinout & Package
LT3695IMSE#TRPBF is housed in a thermally enhanced 16-pin plastic MSOP package with exposed pad (θJA = 40°C/W when soldered). The exposed pad must be connected to PCB ground for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1, Exposed Pad) | Power ground return for catch diode | Must be tied to low-impedance ground plane; exposed pad improves thermal dissipation and reduces ground bounce. |
| DA (Pin 2) | Catch diode anode sense input | Monitors diode current to trigger frequency foldback during overload; enables short-circuit protection without current-sense resistor. |
| NC (Pins 3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to preserve FMEA fault tolerance - bridging or grounding invalidates safety claim. |
| SW (Pin 4) | Switch node output | Connects to inductor, boost capacitor, and cathode of external Schottky catch diode - high dv/dt node requiring tight layout and guard ring. |
| RUN/SS (Pin 5) | Enable and soft-start control | Logic-high (>2.5V) enables regulation; RC network from this pin to GND sets output voltage ramp rate during startup. |
| RT (Pin 6) | Oscillator frequency setting | Resistor to GND programs switching frequency (250kHz–2.2MHz); value determines minimum on/off times and input voltage range. |
| SYNC (Pin 7) | External clock synchronization | Selects operating mode: grounded for Burst Mode, ≥0.8V for pulse-skipping, or AC-coupled clock for precise timing alignment across multiple rails. |
| VIN (Pin 8) | Main input power supply | Supplies internal bias regulator and power switch; requires local 10μF ceramic bypass capacitor close to pin. |
| VC (Pin 9) | Error amplifier output | Controls peak switch current; external RC compensation network stabilizes loop and sets bandwidth. |
| FB (Pin 11) | Feedback reference input | Regulated to 0.8V; connects to resistor divider from VOUT - sets output voltage per VOUT = 0.8V × (1 + R1/R2). |
| PG (Pin 13) | Power good open-collector flag | Sinks current when output is within 10% of target; requires external pull-up to monitored rail or logic supply. |
| GND (Pin 14) | Analog ground reference | Reference for internal circuitry; must be connected to clean analog ground plane, separate from high-current PGND paths. |
| BD (Pin 15) | Boost diode anode supply | Provides bias to internal regulator when >3V applied - improves efficiency by reducing VIN current draw during regulation. |
| BOOST (Pin 16) | Bootstrap drive voltage | Connected to SW via 0.22μF capacitor; generates >VIN voltage to fully saturate internal NPN switch and minimize conduction loss. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-compliant fault tolerance | Guaranteed output voltage stays at or below programmed level during adjacent pin shorts or floating pins - eliminates need for external watchdog or overvoltage clamps in safety-critical designs. |
| Low-ripple Burst Mode operation | Maintains <15mVP-P output ripple at light loads while drawing only 75μA from input - avoids audible noise and enables direct powering of noise-sensitive ADCs or RF sections. |
| 60V transient survivability | Withstands automotive load-dump transients up to 60V without latch-up or damage - eliminates requirement for upstream TVS diodes in 24V systems. |
| Integrated boost diode and driver | Reduces BOM count by integrating boost diode and bootstrap capacitor drive circuitry - simplifies layout and improves reliability versus discrete bootstrap solutions. |
| Programmable soft-start | Controlled output voltage ramp via RUN/SS pin RC network - prevents inrush current and ensures orderly power sequencing in multi-rail systems. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V/5V for infotainment head units and ADAS ECUs under cold-crank and load-dump conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, fault-tolerant, and transient-hardened DC/DC conversion. Use Value: 60V transient tolerance eliminates need for external TVS; FMEA compliance meets ISO 26262 ASIL-B requirements without added monitoring. | Use Scenario: Powering PLC I/O modules and sensor transmitters from 24V industrial bus with wide temperature variation and EMI constraints. IC Role / Device Role / Timing Role: Compact, high-efficiency point-of-load regulator delivering stable 3.3V/5V/12V outputs in space-constrained DIN-rail enclosures. Use Value: 16-pin MSOP with exposed pad enables thermal management in sealed housings; 75μA quiescent current supports low-power sleep modes. |
| Automotive Entertainment Systems | Distributed Supply Regulation |
Use Scenario: Supplying audio DSPs, display controllers, and USB hubs in rear-seat entertainment systems with strict EMC and ripple limits. IC Role / Device Role / Timing Role: Low-noise, high-PG-accuracy buck regulator supporting clean analog and digital domain separation. Use Value: <15mVP-P Burst Mode ripple avoids interference with sensitive audio paths; PG flag enables synchronized system wake-up. | Use Scenario: Providing auxiliary 5V/3.3V rails in telecom base station power shelves where board area and thermal density are constrained. IC Role / Device Role / Timing Role: High-frequency (up to 2.2MHz) buck regulator enabling use of 4.7μH inductors and minimizing footprint. Use Value: Adjustable frequency allows optimization for size vs. efficiency; SYNC pin enables phase interleaving across multiple converters to reduce input ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE#PBF | Higher 3A output current; fixed 3.3V/5V options only; no BD pin; 40V max input | Better suited for higher-current loads but lacks 60V transient tolerance and FMEA fault tolerance | Select when >1A output is required and transients are limited to ≤40V |
| MP2451DT-LF-Z | Lower 0.6A rating; 36V max input; no Burst Mode; no PG flag; no fault-tolerant pin architecture | Cost-optimized solution for non-safety-critical industrial supplies with benign input conditions | Select for cost-sensitive, non-automotive applications where fault tolerance and transient immunity are not required |
Compared with LTC3630EMSE#PBF and MP2451DT-LF-Z, the LT3695IMSE#TRPBF uniquely combines 60V transient survival, FMEA-compliant pin-fault behavior, and sub-15mV light-load ripple - making it the only choice for ASIL-B automotive subsystems and harsh industrial environments demanding guaranteed output voltage ceiling under fault conditions.
Availability
LT3695IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supply, and automotive entertainment systems requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT3695IMSE#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving automotive, industrial, communications, and aerospace markets.
The LT3695 series was designed specifically for fault-tolerant, high-input-voltage DC/DC conversion in automotive and industrial applications where reliability under electrical stress and functional safety compliance are mandatory.
FAQ
What is the maximum input voltage the LT3695IMSE#TRPBF can safely withstand?
The LT3695IMSE#TRPBF can safely sustain nonrepetitive input transients up to 60V for 1 second, while continuous operation is rated up to 36V. Its overvoltage lockout activates at ~38V (typical), halting switching to protect internal circuitry. This capability makes LT3695IMSE#TRPBF suitable for automotive 24V systems subject to load-dump events without external clamping components.
How does the LT3695IMSE#TRPBF achieve fault tolerance during adjacent pin shorts?
The LT3695IMSE#TRPBF uses proprietary internal circuitry that prevents output voltage from exceeding the programmed regulation level even if adjacent pins (e.g., SW and GND, or VIN and PGND) are shorted. This FMEA-compliant behavior is verified across temperature and process corners and is intrinsic to the LT3695IMSE#TRPBF silicon design - no external components or layout modifications are needed to maintain this guarantee.
Can the LT3695IMSE#TRPBF operate with a fixed 3.3V or 5V output without external resistors?
No - the LT3695IMSE#TRPBF is the adjustable version of the family and requires an external resistor divider connected to the FB pin to set output voltage (VOUT = 0.8V × (1 + R1/R2)). Fixed-output variants like LT3695IMSE-3.3#TRPBF or LT3695IMSE-5#TRPBF integrate internal feedback resistors and do not use the FB pin; LT3695IMSE#TRPBF must use external resistors for any output voltage.
What is the purpose of the BD pin on the LT3695IMSE#TRPBF?
The BD pin on the LT3695IMSE#TRPBF connects to the anode of the internal boost Schottky diode and supplies current to the internal bias regulator. When a voltage >3V is applied to BD, the LT3695IMSE#TRPBF draws bias power from BD instead of VIN, reducing input quiescent current and improving efficiency - especially beneficial in high-VIN, low-IOUT applications such as always-on automotive modules.
Does the LT3695IMSE#TRPBF require an external catch diode?
Yes - the LT3695IMSE#TRPBF requires an external Schottky catch diode connected between the DA pin (anode) and SW pin (cathode). The device monitors current through this diode via the DA pin to enable frequency foldback and short-circuit protection. Diode selection (e.g., Diodes Inc. B140) must meet reverse leakage and forward voltage specs per the LT3695IMSE#TRPBF datasheet to ensure proper protection behavior.
LT3695IMSE#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 20V
- 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#TRPBF FAQ
1.How can I place an order for LT3695IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695IMSE#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#TRPBF reliable?
The price and inventory of LT3695IMSE#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3695IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695IMSE#TRPBF?
LT3695IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695IMSE#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#TRPBF?
For technical support, including LT3695IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3695IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3695IMSE#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3695IMSE#TRPBF?
All LT3695IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695IMSE#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3695IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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