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Analog Devices Inc. LT3695EMSE#TRPBF
- Part No.:
- LT3695EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,447
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Product details
Overview
LT3695EMSE#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 features low-ripple Burst Mode operation (<15mVP-P), 75μA no-load quiescent current at 12VIN/3.3VOUT, and integrated protection including overvoltage lockout (60V transient tolerance), frequency foldback, and thermal shutdown. It is used in automotive battery regulation and industrial distributed supplies where high reliability under pin-fault conditions is required.
For engineers reviewing the LT3695EMSE#TRPBF datasheet, LT3695EMSE#TRPBF pinout, LT3695EMSE#TRPBF application, or LT3695EMSE#TRPBF equivalent, key selection criteria include its FMEA-compliant fault tolerance (output stays ≤ programmed VOUT during adjacent pin shorts or open pins), SYNC-controlled mode selection (Burst vs PWM), power good flag, and thermally enhanced 16-pin MSOP package with exposed pad.
Technical Context
The LT3695EMSE#TRPBF employs current-mode control for fast transient response and stable loop behavior across wide input/output ratios. Its internal bipolar NPN switch is driven via a BOOST capacitor to ensure full saturation, enabling efficient operation up to 36V continuous input.
It integrates fault detection circuitry tied to the DA pin for catch diode current monitoring, triggering frequency foldback during overload or short-circuit events. The RUN/SS pin provides both enable/disable control and soft-start via external RC ramping, while the VC pin serves as the error amplifier output with active clamping for precise current limit enforcement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V non-repetitive transients - enables direct connection to automotive batteries and industrial rails without external TVS. |
| Output Current | 1A continuous - supports mid-power point-of-load conversion for microcontrollers, sensors, and interface ICs. |
| Switching Frequency | 250kHz to 2.2MHz (adjustable via RT resistor) - allows optimization of inductor size (e.g., 4.7μH at 2MHz) versus efficiency and dropout. |
| Burst Mode Ripple | <15mVP-P - maintains tight output regulation during light-load sleep modes in always-on systems. |
| Quiescent Current | 75μA at 12VIN/3.3VOUT no load - extends battery life in automotive infotainment and telematics modules. |
| Fault Tolerance | Output remains ≤ programmed VOUT during adjacent pin shorts or floating pins - meets ASIL-B functional safety requirements for basic power rail integrity. |
| Power Good Flag | Open-collector PG output asserts when FB reaches 90% of regulation - enables sequenced power-up and system-level health monitoring. |
Pinout & Package
The LT3695EMSE#TRPBF is housed in a thermally enhanced 16-pin MSOP package with exposed pad (θJA = 40°C/W when soldered). Pin 17 is the exposed thermal pad, electrically connected to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1, Exposed Pad 17) | Power ground return for catch diode | Must be soldered to PCB thermal plane to achieve rated 40°C/W junction-to-ambient thermal resistance. |
| DA (Pin 2) | Catch diode anode sense node | Monitors diode current to trigger frequency foldback during overload; connects directly to Schottky diode anode. |
| NC (Pins 3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to preserve FMEA fault tolerance per ISO 26262. |
| SW (Pin 4) | Internal switch drain node | Connects to inductor, boost capacitor, and catch diode cathode; carries high di/dt switching current. |
| RUN/SS (Pin 5) | Enable + soft-start control | Pull ≥2.5V to enable; apply RC ramp to control output voltage slew rate during startup. |
| RT (Pin 6) | Oscillator frequency set | Resistor to GND sets switching frequency (e.g., 40.2kΩ = 800kHz); determines min/max duty cycle limits. |
| SYNC (Pin 7) | External clock input | Accepts 300kHz–2.2MHz clock; selects Burst Mode (grounded) or PWM (≥0.8V) operation. |
| VIN (Pin 8) | Main input supply | Supplies bias and switch driver; bypass with ≥10μF ceramic near pin to suppress ripple and EMI. |
| VC (Pin 9) | Error amplifier output | Controls peak switch current; external compensation network (R+C to GND) stabilizes feedback loop. |
| FB (Pin 11) | Feedback reference input | Regulated to 0.8V; connects to resistor divider tap for adjustable output voltage configuration. |
| PG (Pin 13) | Power good open-collector | Sinks current when output is within 10% of target; requires external pull-up to monitored rail. |
| GND (Pin 14) | Analog ground reference | Return for internal control circuitry; separate from PGND to minimize noise coupling into error amp. |
| BD (Pin 15) | Boost diode anode | Connects to Schottky diode anode; supplies bias to internal regulator when VBD > 3V, improving light-load efficiency. |
| BOOST (Pin 16) | Bootstrap drive voltage | Capacitor between BOOST and SW generates >VIN voltage to fully saturate internal NPN switch. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-compliant fault tolerance | Guaranteed output voltage ≤ programmed value during adjacent pin shorts or open pins - eliminates need for external watchdog or redundant supervision in safety-critical rails. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while drawing only 75μA - enables clean power for RF sections and precision ADCs during standby. |
| 60V transient survivability | Withstands automotive load-dump transients without latch-up or damage - removes requirement for upstream TVS diodes in 24V systems. |
| Integrated power good flag | Open-collector PG output valid only when VIN > min operating voltage and RUN/SS enabled - simplifies system power sequencing and fault logging. |
| Thermally enhanced MSOP | 16-pin MSOP with exposed pad achieves θJA = 40°C/W - supports 1A continuous operation at 85°C ambient without heatsink in compact layouts. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V or 5V for ECUs, ADAS cameras, and body control modules. IC Role / Device Role / Timing Role: Primary step-down DC/DC converter with fault-tolerant operation during jump-start or alternator surge events. Use Value: Survives 60V transients and maintains regulated output during adjacent pin faults - reduces BOM cost by eliminating external protection components. | Use Scenario: Providing isolated 5V/12V rails in PLC I/O modules, motor drives, and factory automation controllers. IC Role / Device Role / Timing Role: Mid-power point-of-load regulator with programmable frequency for EMI compliance in noisy industrial environments. Use Value: Adjustable 250kHz–2.2MHz switching frequency enables optimal trade-off between filter size and conducted emissions in space-constrained enclosures. |
| Automotive Entertainment Systems | Distributed Supply Regulation |
Use Scenario: Powering infotainment head units, digital dashboards, and rear-seat displays requiring low-noise, always-on 3.3V rails. IC Role / Device Role / Timing Role: Low-quiescent-current buck regulator supporting deep-sleep modes with controlled wake-up sequencing. Use Value: 75μA no-load IQ and soft-start via RUN/SS pin enable rapid, glitch-free power-up after ignition-on without brownout resets. | Use Scenario: Generating auxiliary 3.3V/5V supplies from 24V or 48V backplanes in telecom equipment and server management cards. IC Role / Device Role / Timing Role: High-input-voltage buck controller with SYNC input for synchronized switching across multiple rails. Use Value: External clock synchronization eliminates beat frequencies and reduces overall system EMI in multi-rail power architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIMSE#TRPBF | 42V max input, 2.5A output, Silent Switcher architecture; lower EMI but fixed 3.3V/5V options only | Requires redesign for adjustable output; superior EMI performance in sensitive RF environments | Select when ultra-low EMI is mandatory and output voltage is fixed; not suitable for programmable VOUT designs. |
| MPQ4420AGL-AEC1-Z | AEC-Q100 Grade 1, 36V/2A, integrated MOSFETs; higher current but no BD pin or FMEA fault tolerance | Lacks adjacent-pin-short immunity and 60V transient rating; requires external fault monitoring for ASIL-B | Select for higher current needs in AEC-Q100-compliant designs where fault tolerance is handled at system level. |
Compared with LT8609SIMSE#TRPBF and MPQ4420AGL-AEC1-Z, the LT3695EMSE#TRPBF uniquely delivers FMEA-compliant fault tolerance, 60V transient survival, and adjustable output in a single 16-pin MSOP - making it optimal for cost-sensitive, safety-aware automotive and industrial point-of-load applications where pin-level robustness is non-negotiable.
Availability
LT3695EMSE#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 LT3695EMSE#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 its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LT3695 series belongs to Linear's fault-tolerant monolithic buck regulator product line, designed specifically for automotive and industrial applications demanding operational integrity under electrical stress, pin faults, and harsh environmental conditions.
FAQ
What is the maximum input voltage the LT3695EMSE#TRPBF can safely withstand?
The LT3695EMSE#TRPBF supports continuous operation up to 36V and can safely withstand non-repetitive 60V transients for up to 1 second without damage or latch-up. Its overvoltage lockout activates at ~38V (typical), halting switching to protect internal circuitry while maintaining safe bias conditions. This makes LT3695EMSE#TRPBF suitable for 24V automotive systems subject to load-dump events.
How does the LT3695EMSE#TRPBF achieve fault tolerance during adjacent pin shorts?
The LT3695EMSE#TRPBF implements hardware-level FMEA design: its internal regulation loop ensures the output voltage never exceeds the programmed value-even if adjacent pins (e.g., SW and GND) are shorted or any pin is left floating. This behavior is guaranteed by internal current-limit clamping and independent feedback path integrity, not software or external circuitry. The LT3695EMSE#TRPBF data sheet explicitly confirms this for all variants in the series.
Can the LT3695EMSE#TRPBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LT3695EMSE#TRPBF supports external clock synchronization via the SYNC pin, accepting input frequencies from 300kHz to 2.2MHz with rise/fall times faster than 1μs. When synchronized, it operates in standard PWM mode; grounding SYNC enables low-ripple Burst Mode. The LT3695EMSE#TRPBF maintains full current capability and regulation accuracy across the entire sync range without phase shift or jitter degradation.
What is the purpose of the BD pin on the LT3695EMSE#TRPBF, and how should it be connected?
On the LT3695EMSE#TRPBF, the BD (Boost Diode) pin 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, reducing no-load input current and improving light-load efficiency. It must be connected directly to the diode anode - floating or misrouting BD compromises efficiency and fault tolerance.
Does the LT3695EMSE#TRPBF require an external catch diode, and what are the key selection criteria?
Yes, the LT3695EMSE#TRPBF requires an external Schottky catch diode connected between DA (anode) and SW (cathode). Key selection criteria include: forward voltage ≤900mV at 1A, reverse leakage ≤1μA at 10V, and thermal rating matching the 1A output. Diodes Inc. B140 is validated in the LT3695EMSE#TRPBF typical application circuit. Using a non-Schottky or high-VF diode increases losses and may trigger premature frequency foldback.
LT3695EMSE#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
LT3695EMSE#TRPBF FAQ
1.How can I place an order for LT3695EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695EMSE#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 LT3695EMSE#TRPBF reliable?
The price and inventory of LT3695EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3695EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3695EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695EMSE#TRPBF?
LT3695EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695EMSE#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 LT3695EMSE#TRPBF?
For technical support, including LT3695EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3695EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3695EMSE#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 LT3695EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3695EMSE#TRPBF?
All LT3695EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695EMSE#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 LT3695EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3695EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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