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Analog Devices Inc. LT3695HMSE-5#TRPBF
- Part No.:
- LT3695HMSE-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695HMSE-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,996
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Product details
Overview
LT3695HMSE-5#TRPBF from Analog Devices (formerly Linear Technology) is a fault-tolerant 1A monolithic buck switching regulator with fixed 5V output, wide 3.6V–36V input range, and 60V transient survivability. It features adjustable-frequency PWM operation (250kHz–2.2MHz), low-ripple Burst Mode® (≤15mVP-P), power good flag, and thermal shutdown. Used in automotive battery regulation and industrial distributed supplies where robustness under voltage transients is critical.
For engineers reviewing the LT3695HMSE-5#TRPBF datasheet, LT3695HMSE-5#TRPBF pinout, LT3695HMSE-5#TRPBF application, or LT3695HMSE-5#TRPBF equivalent, key selection criteria include its H-grade 150°C junction rating, FMEA-compliant adjacent-pin-short tolerance, 75μA no-load quiescent current at 12VIN/5VOUT, and integrated boost diode/switch enabling compact 5V supply designs without external catch diode.
Technical Context
The LT3695HMSE-5#TRPBF employs current-mode control for fast transient response and loop stability, with internal slope compensation to maintain current limit accuracy across duty cycles. Its oscillator is resistor-programmable via the RT pin and supports synchronization to external clocks between 300kHz and 2.2MHz.
Fault tolerance is implemented through hardware-level FMEA design: open pins or adjacent pin shorts do not cause overvoltage at the output. Protection includes frequency foldback during overload, DA-pin-based catch diode current sensing, and overvoltage lockout that disables switching above 38V (typical) while sustaining 60V transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% (guaranteed over –40°C to 150°C junction) |
| Input Voltage Range | 3.6V to 36V continuous; survives 60V/1s nonrepetitive transients |
| Max Output Current | 1.0A (minimum guaranteed at full temperature range; derated above 125°C) |
| Quiescent Current | 75μA typical at 12VIN/5VOUT in Burst Mode with no load |
| Switching Frequency | Adjustable 250kHz–2.2MHz via RT resistor; synchronizable 300kHz–2.2MHz |
| Output Ripple | <15mVP-P in Burst Mode (typical application, 10μH inductor) |
| Thermal Rating | H-grade: –40°C to +150°C operating junction temperature (fully specified & guaranteed) |
Pinout & Package
LT3695HMSE-5#TRPBF is housed in a thermally enhanced 16-pin MSOP package with exposed pad (θJA = 40°C/W when pad soldered). Pin 17 is the exposed PGND pad, requiring PCB connection for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power ground return for catch diode | Must be connected to PCB ground plane; exposed pad (Pin 17) is electrically tied to Pin 1 and critical for thermal dissipation |
| DA (2) | Catch diode anode sense input | Monitors external Schottky diode current to trigger frequency foldback during overload or short-circuit |
| 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 cathode of external catch diode; 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 set resistor | Grounded resistor sets switching frequency (e.g., 40.2kΩ = 800kHz); determines inductor size and input voltage range trade-offs |
| SYNC (7) | External clock input | Accepts 300kHz–2.2MHz clock; grounding via 100kΩ enables low-ripple Burst Mode; >0.8V enables pulse-skipping |
| VIN (8) | Main input power supply | Supplies internal bias regulator and power switch; requires local ceramic bypass capacitance |
| VC (9) | Error amplifier output | Controls peak switch current; external RC compensation network stabilizes feedback loop |
| FB (11) | Feedback reference point | Not used in LT3695HMSE-5#TRPBF - internal 5V divider replaces external resistors |
| PG (13) | Power good open-collector flag | Active-low signal asserts when output reaches 90% of 5V (i.e., 4.5V); requires external pull-up |
| GND (14) | Analog ground reference | Reference for internal circuitry; separate from PGND but tied on PCB for low-noise layout |
| OUT1/OUT2 (13, 14) | Fixed-output voltage terminals | Directly connect to 5V output rail; also supply bias current to internal regulator when VOUT > 3V |
| BOOST (16) | Bootstrap drive voltage | Capacitor (0.22μF typical) between BOOST and SW generates >VIN voltage to fully saturate NPN switch |
Key Features
| Feature | Design Value |
|---|---|
| FMEA Fault Tolerance | Guaranteed output remains ≤5V during adjacent pin shorts or floating pins - eliminates need for external overvoltage clamping |
| Integrated Boost Diode | On-chip Schottky diode eliminates external boost diode, reducing BOM count and board space in 5V buck designs |
| H-Temperature Grade | Full electrical specification guaranteed from –40°C to +150°C junction - suitable for under-hood automotive and high-temp industrial use |
| Low-Ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while achieving 75μA quiescent current - ideal for always-on systems |
| Overvoltage Lockout | Disables switching above 38V (typical) to protect downstream circuitry, while surviving 60V transients without damage |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery rails to stable 5V for infotainment ECUs and ADAS sensors exposed to load dump (60V) and cold-crank (<3.6V) events. IC Role / Device Role / Timing Role: Primary 5V power supply IC with integrated transient protection and FMEA compliance for ASIL-B functional safety paths. Use Value: Eliminates need for external TVS and overvoltage crowbar circuits; H-grade rating ensures reliability in engine bay environments up to 150°C junction. | Use Scenario: Providing isolated 5V rails to PLC I/O modules and fieldbus gateways operating from unregulated 24V DC industrial supplies. IC Role / Device Role / Timing Role: Fault-tolerant buck converter delivering regulated 5V with power-good signaling for system supervision and brownout detection. Use Value: Adjacent-pin-short immunity prevents single-point failure from PCB contamination or mechanical damage; low 75μA quiescent current extends backup battery life. |
| Automotive Entertainment Systems | Distributed Supply Regulation |
Use Scenario: Powering USB-C PD controllers, display timing controllers, and audio codecs in head units subject to ISO 7637-2 pulse 5a (75V/100ms) transients. IC Role / Device Role / Timing Role: Secondary 5V regulator downstream of main DC/DC, providing clean, low-noise power with Burst Mode efficiency at standby. Use Value: Integrated low-ripple Burst Mode reduces EMI vs. traditional pulse-skipping, easing EMC compliance; 16-pin MSOP fits tight layout constraints. | Use Scenario: Generating local 5V supplies for FPGA configuration, microcontroller peripherals, and sensor interfaces in modular test equipment. IC Role / Device Role / Timing Role: Fixed-output buck regulator with programmable frequency and SYNC input for noise-sensitive mixed-signal subsystems. Use Value: Synchronization capability allows alignment with system clock to avoid beat frequencies; RT pin enables optimization for small inductors (e.g., 4.7μH @ 2MHz). |
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 |
|---|---|---|---|
| LTC3630EMSE-5#TRPBF | Same 5V fixed output, 1A rating, and MSOP-16 package; lower 3.1V min input; no 60V transient rating; uses MOSFET switch (not bipolar) | Lacks 60V transient survivability and FMEA fault tolerance; better suited for low-input-voltage, high-efficiency apps without harsh transients | Select LTC3630EMSE-5#TRPBF only if input never exceeds 40V and fault tolerance is not required; LT3695HMSE-5#TRPBF remains preferred for automotive/industrial ruggedness |
| TPS54302DDAR | 5V fixed output, 3A rating, SOIC-8; 2.7V–6V input range only; no overvoltage lockout; no 60V transient rating | Higher current but incompatible input range; lacks fault tolerance, PG flag, and thermal grade - unsuitable for direct replacement | TPS54302DDAR is not a functional alternative for LT3695HMSE-5#TRPBF due to fundamental input voltage and ruggedness mismatch; consider only for new low-voltage designs |
Compared with LTC3630EMSE-5#TRPBF and TPS54302DDAR, LT3695HMSE-5#TRPBF uniquely delivers guaranteed 60V transient survival, FMEA-compliant fault tolerance, and H-grade 150°C operation - making it the sole choice for automotive and high-reliability industrial 5V buck applications demanding robustness beyond basic regulation.
Availability
LT3695HMSE-5#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 and transient-voltage conditions.
Supply support for LT3695HMSE-5#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 and maintains full product support, documentation, and manufacturing continuity for the LT3695 series.
The LT3695 series was designed specifically for rugged, fault-tolerant step-down regulation in automotive and industrial environments where input transients, temperature extremes, and system-level reliability are primary constraints.
FAQ
What is the maximum input voltage the LT3695HMSE-5#TRPBF can handle continuously and during transients?
The LT3695HMSE-5#TRPBF operates continuously from 3.6V to 36V input. It is rated to safely withstand nonrepetitive input transients up to 60V for 1 second without damage or output overvoltage - a key feature enabled by its overvoltage lockout circuit that disables switching above ~38V (typical). This makes LT3695HMSE-5#TRPBF suitable for automotive load-dump scenarios.
Does the LT3695HMSE-5#TRPBF require external feedback resistors to set the 5V output?
No. The LT3695HMSE-5#TRPBF is a fixed-output variant with internal resistor dividers configured for 5.0V ±1%. The FB pin is unused and should be left unconnected. External resistors are only required for the adjustable LT3695 versions (e.g., LT3695HMSE#TRPBF), not for LT3695HMSE-5#TRPBF.
How does the LT3695HMSE-5#TRPBF achieve fault tolerance during adjacent pin shorts?
The LT3695HMSE-5#TRPBF implements hardware-level FMEA design: internal circuitry ensures the output voltage cannot exceed its programmed 5V value even if adjacent pins (e.g., VIN–SW or SW–GND) are shorted, or if pins like NC or RUN/SS are left floating. This behavior is guaranteed across the full –40°C to +150°C temperature range and eliminates need for external overvoltage protection in LT3695HMSE-5#TRPBF designs.
What is the purpose of the DA pin on the LT3695HMSE-5#TRPBF, and how is it used?
The DA (Diode Anode) pin on LT3695HMSE-5#TRPBF senses current through the external Schottky catch diode. When valley current exceeds ~1.6A, it triggers frequency foldback to limit inductor current during overload or short-circuit conditions. For LT3695HMSE-5#TRPBF, DA must be connected to the anode of the external catch diode - this is mandatory for protection and cannot be omitted.
Can the LT3695HMSE-5#TRPBF be synchronized to an external clock, and what is the supported frequency range?
Yes. The SYNC pin of LT3695HMSE-5#TRPBF accepts external clock signals from 300kHz to 2.2MHz. Clock edges must have rise/fall times faster than 1μs. Synchronizing allows noise-sensitive systems to avoid beat frequencies and align switching with other converters - a capability not available in many competing fixed-output regulators.
LT3695HMSE-5#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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 250kHz ~ 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3695HMSE-5#TRPBF FAQ
1.How can I place an order for LT3695HMSE-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695HMSE-5#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 LT3695HMSE-5#TRPBF reliable?
The price and inventory of LT3695HMSE-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3695HMSE-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3695HMSE-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695HMSE-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695HMSE-5#TRPBF?
LT3695HMSE-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695HMSE-5#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 LT3695HMSE-5#TRPBF?
For technical support, including LT3695HMSE-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695HMSE-5#TRPBF requirements.
6.How does Aetrix verify that LT3695HMSE-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3695HMSE-5#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 LT3695HMSE-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3695HMSE-5#TRPBF?
All LT3695HMSE-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695HMSE-5#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 LT3695HMSE-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3695HMSE-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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