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Analog Devices Inc. LT3695EMSE#PBF
- Part No.:
- LT3695EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:369
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Product details
Overview
LT3695EMSE#PBF 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 60V transient tolerance. It integrates a bipolar NPN power switch, boost diode, current-mode controller, and power-good flag - designed for automotive battery regulation and industrial distributed supplies where reliability under pin-fault conditions is critical.
For engineers reviewing the LT3695EMSE#PBF datasheet, LT3695EMSE#PBF pinout, LT3695EMSE#PBF application, or LT3695EMSE#PBF equivalent, key selection criteria include its FMEA-compliant adjacent-pin-short immunity, low-ripple Burst Mode operation (<15mVP-P), 75μA no-load quiescent current, 0.8V feedback reference, and thermally enhanced 16-pin MSOP package with exposed pad.
Technical Context
The LT3695EMSE#PBF employs current-mode control with slope compensation for fast transient response and loop stability across wide duty cycles. Its oscillator supports programmable frequency via RT resistor and external synchronization (300kHz–2.2MHz) with selectable Burst Mode or PWM operation via SYNC pin logic level.
Fault tolerance is implemented through hardware-level detection of adjacent pin shorts or floating pins - ensuring output never exceeds programmed regulation voltage. Protection includes frequency foldback during overload, thermal shutdown, switch current limiting (1.45A typical), and overvoltage lockout at 38V (typical), enabling safe operation during 60V transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands non-repetitive 60V/1s transients - enables direct connection to automotive batteries and industrial 24V/36V rails. |
| Output Current | 1A continuous - supports mid-power point-of-load conversion without external current boosting. |
| Switching Frequency | 250kHz to 2.2MHz (RT-programmable) - allows trade-off between inductor size (e.g., 4.7μH at 2MHz) and efficiency/dropout performance. |
| Feedback Reference | 0.8V ±1% (over temperature) - enables precise output programming from 0.8V to 20V using external resistive divider. |
| Quiescent Current | 75μA at 12VIN→3.3VOUT (no load, Burst Mode) - extends battery life in always-on automotive or IoT edge nodes. |
| Output Ripple | <15mVP-P in Burst Mode - meets low-noise analog supply requirements without additional LDO post-regulation. |
| Power Good Flag | Open-collector PG with 90% VFB threshold and 12mV hysteresis - provides reliable system sequencing and fault indication. |
Pinout & Package
LT3695EMSE#PBF is housed in a thermally enhanced 16-pin 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 | Low-inductance path for high di/dt catch diode current; exposed pad improves thermal dissipation and reduces ground bounce. |
| DA (Pin 2) | Catch diode anode sense input | Monitors valley inductor current to trigger frequency foldback if >1.6A - prevents inductor saturation during short-circuit events. |
| NC (Pins 3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to preserve FMEA fault tolerance against adjacent-pin shorts. |
| SW (Pin 4) | Switch node | Drives external inductor and boost capacitor; high dv/dt node requiring tight layout and minimized trace area. |
| RUN/SS (Pin 5) | Enable + soft-start control | Logic-high (>2.5V) enables regulation; RC network here sets controlled output voltage ramp time - prevents inrush current. |
| RT (Pin 6) | Oscillator frequency set | Resistor-to-ground sets switching frequency (e.g., 40.2kΩ → 800kHz); determines minimum on/off times and input voltage range limits. |
| SYNC (Pin 7) | External clock input / mode select | Ground via 100kΩ for Burst Mode; ≥0.8V for pulse-skipping; external clock edges <1μs rise/fall enable deterministic timing sync. |
| VIN (Pin 8) | Main input supply | Supplies internal bias regulator and power switch; requires local 10μF ceramic bypass 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 input | Regulated to 0.8V; connects to resistor divider tap - defines output voltage with ±1% accuracy over temperature. |
| PG (Pin 13) | Power good open-collector output | Pulled low until FB reaches 90% of target; requires external pull-up for MCU reset or sequencing logic. |
| GND (Pin 14) | Analog ground reference | Reference for internal circuitry; must be tied directly to clean local ground plane - separate from PGND at single point. |
| BD (Pin 15) | Boost diode anode | Connects to Schottky anode; supplies bias current to internal regulator when >3V - improves light-load efficiency. |
| BOOST (Pin 16) | Bootstrap drive | Capacitor (0.22μF) between BOOST and SW generates >VIN voltage to fully saturate bipolar NPN switch - ensures low RCE(sat). |
Key Features
| Feature | Design Value |
|---|---|
| FMEA Fault Tolerance | Guaranteed output ≤ programmed voltage during adjacent pin shorts or floating NC pins - eliminates need for external fault monitoring in safety-critical systems. |
| Low-Ripple Burst Mode | Maintains <15mVP-P output ripple while drawing only 75μA from VIN at no load - avoids audible noise and preserves signal integrity in RF/analog subsystems. |
| 60V Transient Withstand | Withstands 60V/1s non-repetitive transients without latch-up or damage - meets ISO 7637-2 Pulse 5a requirements for automotive 12V systems. |
| Programmable Frequency & Sync | 250kHz–2.2MHz RT-set frequency with external clock synchronization - enables EMI spread-spectrum design and multi-rail timing coordination. |
| Integrated Power Good | Open-collector PG with 90% trip threshold and built-in hysteresis - simplifies system power sequencing without external comparators or timers. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V/5V for infotainment head units and ADAS sensors under cold-crank (4.5V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator with integrated fault protection and transient robustness - serves as front-end power converter before LDOs or PMICs. Use Value: Eliminates need for external TVS and discrete fault monitors; maintains regulated output during ISO 7637-2 pulses without system reset. | Use Scenario: Providing isolated 5V/12V rails to PLC I/O modules and fieldbus gateways operating from unregulated 24V industrial supplies. IC Role / Device Role / Timing Role: Standalone buck regulator with programmable frequency and soft-start - delivers stable power to microcontrollers, ADCs, and communication interfaces. Use Value: Reduces BOM count by integrating switch, diode, and controller; exposed-pad MSOP enables convection-cooled operation in sealed enclosures. |
| Automotive Entertainment Systems | Distributed Supply Regulation |
Use Scenario: Powering USB-C PD accessories, display backlight drivers, and audio amplifiers in center consoles subject to frequent ignition cycling and EMI-sensitive environments. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with Burst Mode for standby states - synchronizable to system clock to avoid beat frequencies. Use Value: Meets CISPR 25 Class 5 radiated emissions limits; 75μA IQ extends battery backup runtime during vehicle sleep modes. | Use Scenario: Generating auxiliary 3.3V supplies for FPGA configuration, sensor signal conditioning, and wireless SoCs in modular industrial equipment. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with 0.8V reference - supports flexible voltage scaling and dynamic power management. Use Value: Enables precise output setting from 0.8V to 20V using standard 1% resistors; FB accuracy ensures consistent ADC reference and logic rail stability. |
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, 2.5A, Silent Switcher architecture, lower EMI; fixed 3.3V/5V options only; no BD pin or FMEA fault tolerance. | Better for ultra-low EMI designs (e.g., medical imaging), but lacks pin-fault immunity and adjustable output. | Select LT8609SIV#PBF when EMI compliance is primary concern and output voltage is fixed; retain LT3695EMSE#PBF for fault-tolerant adjustable-output systems. |
| TPS54202HDDCR | 2.9V–60V input, 2A, integrated MOSFETs, 500kHz–2.2MHz sync; no 60V transient rating; no FMEA pin-fault protection. | Suitable for higher-current industrial supplies, but requires external fault monitoring for automotive-grade reliability. | Choose TPS54202HDDCR for cost-sensitive 2A applications where transient robustness is managed externally; LT3695EMSE#PBF remains preferred for intrinsic fault tolerance. |
Compared with LT8609SIV#PBF and TPS54202HDDCR, the LT3695EMSE#PBF uniquely combines 60V transient survival, FMEA-compliant pin-fault behavior, and adjustable 0.8V–20V output in a single 16-pin MSOP - making it irreplaceable in safety-critical automotive and industrial point-of-load designs where component-level fault containment is mandated.
Availability
LT3695EMSE#PBF 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 (–40°C to 125°C).
Supply support for LT3695EMSE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.
The LT3695 series belongs to ADI's high-reliability power management portfolio, engineered specifically for automotive and industrial applications demanding fault tolerance, wide input range, and transient robustness - not general-purpose DC/DC conversion.
FAQ
What is the maximum input voltage the LT3695EMSE#PBF can safely withstand?
The LT3695EMSE#PBF supports continuous operation up to 36V and can 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 maintaining safe bias conditions. This capability meets ISO 7637-2 Pulse 5a requirements for 12V automotive systems.
How does the LT3695EMSE#PBF achieve fault tolerance during adjacent pin shorts?
The LT3695EMSE#PBF implements hardware-level FMEA fault tolerance: if any pin (including NC pins) is shorted to an adjacent pin or left floating, internal circuitry ensures the output voltage never exceeds the programmed regulation value. This behavior is guaranteed by design and verified per JEDEC JESD78, eliminating risk of downstream component damage during assembly or field faults.
What is the purpose of the BD pin on the LT3695EMSE#PBF?
The BD (Boost Diode) pin on the LT3695EMSE#PBF connects to the anode of the external Schottky catch diode and supplies bias current to the internal regulator. When BD voltage exceeds 3V, the device draws bias power from BD instead of VIN - improving light-load efficiency by reducing quiescent current drawn from the main input rail.
Can the LT3695EMSE#PBF be synchronized to an external clock, and what are the valid frequency ranges?
Yes, the LT3695EMSE#PBF supports external clock synchronization via the SYNC pin. Valid input clock frequencies range from 300kHz to 2.2MHz, with rise/fall times faster than 1μs. Synchronization enables EMI reduction through frequency alignment and deterministic timing in multi-rail systems - critical for automotive and industrial noise-sensitive applications.
What thermal considerations apply to the LT3695EMSE#PBF's MSOP package?
The LT3695EMSE#PBF uses a 16-pin MSOP with exposed pad (Pin 17). Thermal resistance θJA is 40°C/W when the exposed pad is soldered to a minimum 100mm² copper area on the PCB; without soldering, θJA rises to 110°C/W. Proper pad connection is mandatory for operation at full 1A load across –40°C to 125°C ambient - failure to solder the pad risks thermal shutdown above 600mA.
LT3695EMSE#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:
- 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
LT3695EMSE#PBF FAQ
1.How can I place an order for LT3695EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695EMSE#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#PBF reliable?
The price and inventory of LT3695EMSE#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#PBF is usually 5 days.
3.What payment methods are accepted for LT3695EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695EMSE#PBF?
LT3695EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695EMSE#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#PBF?
For technical support, including LT3695EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695EMSE#PBF requirements.
6.How does Aetrix verify that LT3695EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3695EMSE#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#PBF meets industry standards.
7.What is the process for return or replacement of LT3695EMSE#PBF?
All LT3695EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695EMSE#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#PBF part is unused and in its original packaging.
Return procedure for LT3695EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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