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Analog Devices Inc. LT3695IMSE-5#TRPBF
- Part No.:
- LT3695IMSE-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695IMSE-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,850
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Product details
Overview
LT3695IMSE-5#TRPBF 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 survivability. It integrates power switch, boost diode, oscillator, and current-mode control circuitry, and is designed for automotive battery regulation and industrial distributed supplies where robustness under pin-fault conditions is critical.
For engineers reviewing the LT3695IMSE-5#TRPBF datasheet, LT3695IMSE-5#TRPBF pinout, LT3695IMSE-5#TRPBF application, or LT3695IMSE-5#TRPBF equivalent, key selection criteria include its FMEA-compliant adjacent-pin-short tolerance, low-ripple Burst Mode operation (<15mVP-P), 75μA no-load quiescent current at 12VIN/5VOUT, 250kHz–2.2MHz adjustable frequency, and integrated power-good flag with 90% VOUT threshold.
Technical Context
The LT3695IMSE-5#TRPBF employs current-mode PWM control with internal slope compensation and frequency foldback during overload or startup. Its VC pin directly controls peak switch current via error amplifier output, while RUN/SS enables soft-start and shutdown with <1μA supply current. The device uses an internal bipolar NPN switch driven by a BOOST capacitor to ensure full saturation across input voltage range.
Fault tolerance is implemented via dedicated sensing on DA and NC pins: open or shorted adjacent pins do not cause overvoltage at VOUT; NC pins (3, 10, 12) must remain floating. Protection includes thermal shutdown, switch current limit (1.45A typical, SYNC-grounded), and overvoltage lockout at 38V (typical), enabling safe operation during 60V transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% (guaranteed over –40°C to 125°C junction) |
| Input Voltage Range | 3.6V to 36V continuous; survives 60V/1s nonrepetitive transients |
| Max Output Current | 1.0A (minimum guaranteed at VIN > 12V; 0.9A at VIN > 6.9V) |
| Quiescent Current | 75μA typical at 12VIN/5VOUT, no load, in Burst Mode |
| Switching Frequency | Adjustable 250kHz–2.2MHz via RT resistor; synchronizable 300kHz–2.2MHz |
| Output Ripple | <15mVP-P in Burst Mode (typical application, 5V out) |
| Power Good Threshold | 90% of regulated output (4.5V), with 75mV hysteresis |
Pinout & Package
LT3695IMSE-5#TRPBF is housed in a thermally enhanced 16-pin MSOP package with exposed pad (Pin 17) for improved thermal dissipation (θJA = 40°C/W when soldered). Pin count, layout, and thermal design are optimized for high-reliability automotive and industrial PCBs requiring compact footprint and robust thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power ground for catch diode return path | Must be connected to low-impedance ground plane; exposed pad soldered for thermal performance |
| DA (2) | Catch diode anode sense input | Monitors diode current to trigger frequency foldback during overload or short-circuit |
| NC (3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to maintain FMEA fault tolerance |
| SW (4) | Internal switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt switching current |
| RUN/SS (5) | Enable and soft-start control | Logic-high (>2.5V) enables operation; RC network here sets output voltage ramp rate |
| RT (6) | Oscillator frequency programming | Resistor to ground sets switching frequency (e.g., 40.2kΩ → 800kHz) |
| SYNC (7) | External clock synchronization input | Accepts 300kHz–2.2MHz clock; selects Burst Mode (grounded) or PWM (≥0.8V) |
| VIN (8) | Main input power supply | Bypass locally with ceramic capacitor; supports up to 36V continuous, 60V transient |
| VC (9) | Error amplifier output | Controls peak switch current; external compensation network connects here |
| FB (11) | Feedback reference (not used in -5 version) | Not connected internally for LT3695IMSE-5#TRPBF; fixed 5V output uses internal divider |
| PG (13) | Open-collector power-good flag | Sinks ≥100μA when active; pulled high externally to indicate regulated output |
| GND (14) | Analog ground reference | Reference for internal circuitry; tie directly to local ground plane |
| OUT1/OUT2 (13, 14) | Fixed-output voltage terminals | Deliver regulated 5V; connect to output capacitor and feedback resistors (internal for -5 variant) |
| BD (15) | Boost diode anode connection | Supplies bias current to internal regulator when VOUT > 3V; improves light-load efficiency |
| BOOST (16) | Bootstrap drive voltage node | Capacitor between BOOST and SW provides >VIN gate drive for NPN switch saturation |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-compliant fault tolerance | Output remains ≤5V during adjacent pin shorts or floating NC pins-critical for automotive safety-critical rails |
| Low-ripple Burst Mode | Maintains <15mVP-P ripple at light loads while drawing only 75μA from VIN-enables always-on systems |
| 60V transient survivability | Withstands 60V/1s input spikes without latch-up or damage-meets ISO 7637-2 pulse 5a requirements |
| Integrated power-good flag | PG asserts when VOUT reaches 4.5V (90%) with 75mV hysteresis-enables sequenced system power-up |
| Thermally enhanced MSOP | 16-pin MSOP with exposed pad achieves θJA = 40°C/W-supports 1A continuous output 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 5V buck regulator providing stable rail for microcontrollers, displays, and audio codecs. Use Value: Survives ISO 7637-2 pulse 5a without external TVS; eliminates need for discrete overvoltage clamping. | Use Scenario: Generating 5V for PLC I/O modules operating from 24V industrial bus with wide temperature variation. IC Role / Device Role / Timing Role: Fault-tolerant point-of-load regulator ensuring uninterrupted operation despite connector faults or ESD events. Use Value: Adjacent-pin-short immunity prevents output overvoltage during field wiring errors-reduces field failure rate. |
| Automotive Entertainment Systems | Distributed Supply Regulation |
Use Scenario: Supplying 5V to rear-seat entertainment controllers in vehicles with stop-start systems and cold-crank down to 3.6V. IC Role / Device Role / Timing Role: High-efficiency buck converter maintaining regulation during engine cranking and battery voltage sag. Use Value: 3.6V minimum input and 75μA Burst Mode IQ enable reliable boot and standby operation. | Use Scenario: Providing isolated 5V rails for sensor interface boards in factory automation equipment. IC Role / Device Role / Timing Role: Compact, thermally efficient DC-DC stage replacing linear regulators to reduce heat buildup in enclosed enclosures. Use Value: 16-pin MSOP with exposed pad delivers 1A at 125°C ambient-eliminates heatsink requirement. |
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#TRPBF | 40V max input, 500mA output, no PG flag, no fault tolerance | Lacks adjacent-pin-short immunity and 1A capability; suited for lower-power auxiliary rails | Select only if output current ≤500mA and fault tolerance is not required |
| MP2451DT-LF-Z | 36V max input, 0.6A output, no Burst Mode ripple spec, no PG flag | Higher IQ (120μA), no integrated power-good, no FMEA compliance per datasheet | Consider only for cost-sensitive, non-safety-critical 5V rails with <600mA load |
Compared with LTC3630EMSE#TRPBF and MP2451DT-LF-Z, LT3695IMSE-5#TRPBF uniquely delivers 1A output with guaranteed 60V transient survival, FMEA-compliant pin-fault behavior, and <15mVP-P Burst Mode ripple-making it the only choice for automotive-grade 5V rails demanding functional safety and robustness.
Availability
LT3695IMSE-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 ranges and long production lifecycles.
Supply support for LT3695IMSE-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LT3695 series was developed by Linear Technology (acquired by ADI in 2017) specifically for automotive and industrial applications demanding fault-tolerant power conversion, wide input voltage range, and high reliability under harsh electrical environments.
FAQ
What is the guaranteed operating temperature range for LT3695IMSE-5#TRPBF?
The LT3695IMSE-5#TRPBF is guaranteed to operate over a junction temperature range of –40°C to 125°C. This "I-grade" rating is fully specified and tested across the entire range, making it suitable for under-hood automotive and industrial environments where ambient temperatures exceed 85°C.
Does LT3695IMSE-5#TRPBF require an external feedback resistor network?
No. LT3695IMSE-5#TRPBF features an internal resistor divider that fixes the output voltage at 5.0V. The FB pin is unused and must be left unconnected; external resistors are only required for the adjustable LT3695 variants (e.g., LT3695IMSE#TRPBF).
How does LT3695IMSE-5#TRPBF achieve fault tolerance during adjacent pin shorts?
LT3695IMSE-5#TRPBF implements FMEA-compliant design: NC pins (3, 10, 12) are unconnected internally, and protection circuitry ensures the output voltage cannot exceed its programmed 5V value even if any two adjacent pins are shorted or one pin is left floating-verified per datasheet Section "FMEA Fault Tolerant".
What is the maximum input voltage LT3695IMSE-5#TRPBF can sustain continuously versus transiently?
LT3695IMSE-5#TRPBF operates continuously up to 36V input. It safely withstands nonrepetitive 60V transients for up to 1 second due to integrated overvoltage lockout (OVLO) that disables switching above ~38V, preventing damage while allowing recovery once voltage returns within range.
Can LT3695IMSE-5#TRPBF be synchronized to an external clock, and what is the supported frequency range?
Yes. The SYNC pin of LT3695IMSE-5#TRPBF accepts external clock signals from 300kHz to 2.2MHz with rise/fall times faster than 1μs. When synchronized, the device maintains tight frequency alignment and avoids beat frequencies in multi-rail systems-critical for EMI-sensitive automotive designs.
LT3695IMSE-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3695IMSE-5#TRPBF FAQ
1.How can I place an order for LT3695IMSE-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695IMSE-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 LT3695IMSE-5#TRPBF reliable?
The price and inventory of LT3695IMSE-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 LT3695IMSE-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3695IMSE-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695IMSE-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695IMSE-5#TRPBF?
LT3695IMSE-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695IMSE-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 LT3695IMSE-5#TRPBF?
For technical support, including LT3695IMSE-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695IMSE-5#TRPBF requirements.
6.How does Aetrix verify that LT3695IMSE-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3695IMSE-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 LT3695IMSE-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3695IMSE-5#TRPBF?
All LT3695IMSE-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695IMSE-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 LT3695IMSE-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3695IMSE-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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