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Analog Devices Inc. LT3695HMSE#TRPBF
- Part No.:
- LT3695HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,270
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Product details
Overview
LT3695HMSE#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 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 supplies where reliability under pin-fault conditions is critical.
For engineers reviewing the LT3695HMSE#TRPBF datasheet, LT3695HMSE#TRPBF pinout, LT3695HMSE#TRPBF application, or LT3695HMSE#TRPBF equivalent, key selection criteria include its FMEA-compliant adjacent-pin-short immunity, low-ripple Burst Mode operation (<15mVP-P), 75μA no-load quiescent current at 12VIN/3.3VOUT, thermal shutdown, and 16-pin MSOP package with exposed pad for enhanced thermal performance.
Technical Context
The LT3695HMSE#TRPBF uses constant-frequency current-mode control with internal slope compensation, enabling fast transient response and stable loop behavior across wide duty-cycle ranges. Its oscillator is resistor-programmable via the RT pin and supports external synchronization (300kHz–2.2MHz) through the SYNC pin for EMI reduction.
Fault tolerance is implemented via hardware-level detection: output voltage remains at or below regulation during adjacent pin shorts or floating pins; DA pin monitors catch-diode current to trigger frequency foldback; and overvoltage lockout disables switching above 38V (typical), allowing safe 60V transients. The H-grade junction temperature rating (–40°C to +150°C) confirms suitability for under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands nonrepetitive 60V/1s transients - enables direct connection to 24V/36V automotive batteries without external TVS clamping. |
| Output Current | 1A continuous - sufficient to power microcontrollers, sensors, and interface ICs in distributed supply architectures. |
| 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). |
| Quiescent Current | 75μA typical at 12VIN/3.3VOUT in Burst Mode - extends battery life in always-on systems like telematics or ADAS modules. |
| Feedback Reference | 0.8V ±1% (LT3695 variant) - enables precise output programming from 0.8V to 20V using external resistive divider. |
| Thermal Rating | Junction temperature range –40°C to +150°C - qualified for engine compartment and industrial control cabinet deployment. |
| Protection Features | Short-circuit protection, thermal shutdown, frequency foldback, and overvoltage lockout - reduces need for external supervision circuitry. |
Pinout & Package
LT3695HMSE#TRPBF is housed in a thermally enhanced 16-pin MSOP package with exposed pad (Pin 17), offering θJA = 40°C/W when soldered to PCB copper. The exposed pad must be connected to PGND for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power ground return for catch diode | Primary current return path for power stage; exposed pad (17) must be soldered to thermal plane for thermal management. |
| DA (2) | Catch diode anode sense input | Monitors external Schottky diode current to enable frequency foldback during overload or short-circuit events. |
| NC (3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to preserve FMEA fault tolerance against adjacent-pin shorts. |
| SW (4) | Switch node | Drives external inductor and connects to BOOST capacitor; carries high dI/dt switching current - requires tight layout. |
| RUN/SS (5) | Enable and soft-start control | Logic-high (>2.5V) enables regulation; RC network here sets controlled output voltage ramp time. |
| RT (6) | Oscillator frequency setting | Resistor-to-ground sets switching frequency (250kHz–2.2MHz); value determines inductor size and input range. |
| SYNC (7) | External clock input | Accepts 300kHz–2.2MHz clock; selects between Burst Mode (grounded) and PWM (≥0.8V) or synchronizes to system clock. |
| VIN (8) | Main power input | Supplies internal bias regulator and power switch; must be locally bypassed with ≥10μF ceramic capacitor. |
| VC (9) | Error amplifier output | Controls peak switch current; external RC compensation network stabilizes control loop. |
| FB (11) | Feedback input | Regulated to 0.8V; connects to resistor divider tap for adjustable output voltage configuration. |
| PG (13) | Power good open-collector output | Active-low flag indicating output is within ±10% of target; requires external pull-up for system monitoring. |
| GND (14) | Analog ground reference | Reference for internal circuitry; must connect directly to local ground plane, separate from PGND if noise-sensitive. |
| BD (15) | Boost diode anode | Connects to anode of external Schottky diode; supplies bias current to internal regulator when VBD > 3V. |
| BOOST (16) | Bootstrap drive voltage | Capacitor (0.22μF) between BOOST and SW generates >VIN voltage to fully saturate internal NPN switch. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA fault tolerance | Output voltage remains ≤ programmed value during adjacent pin shorts or floating pins - eliminates risk of overvoltage damage to downstream loads. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while drawing only 75μA from input - ideal for always-on sensor nodes. |
| 60V transient survival | Withstands 60V/1s nonrepetitive transients without latch-up or degradation - meets ISO 7637-2 Pulse 5a requirements for 24V systems. |
| Integrated power-good flag | Open-collector PG pin asserts after output reaches 90% of regulation - enables sequenced power-up in multi-rail systems. |
| Thermally enhanced MSOP | 16-pin MSOP with exposed pad achieves θJA = 40°C/W - supports 1A continuous operation at +125°C ambient without heatsink. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 24V vehicle battery (with load dump transients up to 60V) to 3.3V/5V for infotainment head units and body control modules. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator with integrated fault protection and thermal robustness for under-dash mounting. Use Value: Eliminates need for external TVS and supervision ICs; H-grade rating ensures operation at +150°C junction temperature near engine bay. | Use Scenario: Providing isolated 5V rails to PLC I/O modules and fieldbus gateways operating from 24V industrial supplies. IC Role / Device Role / Timing Role: Fault-resilient point-of-load converter tolerant to wiring faults and connector misinsertion in factory automation cabinets. Use Value: Adjacent-pin-short immunity prevents catastrophic overvoltage during maintenance or field wiring errors. |
| Automotive Entertainment Systems | Distributed Supply Regulation |
Use Scenario: Powering camera modules, display drivers, and audio DSPs in rear-seat entertainment systems with variable input due to alternator ripple. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck regulator supporting Burst Mode for standby and PWM for active video/audio processing. Use Value: 75μA no-load IQ extends battery runtime in parked mode; SYNC pin enables spread-spectrum clocking to reduce EMI in RF-sensitive zones. | Use Scenario: Generating 3.3V for MCU, CAN transceivers, and analog front-ends in modular sensor nodes deployed across large machinery. IC Role / Device Role / Timing Role: Compact, thermally efficient regulator enabling dense board layouts in space-constrained enclosures. Use Value: 16-pin MSOP with exposed pad delivers 1A output in 2 footprint - reduces BOM count vs. discrete switcher solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#TRPBF | 40V max input, 1.2A output, 3mm × 4mm 16-pin MSOP, but lacks 60V transient tolerance and FMEA pin-fault immunity. | Targeted at industrial rather than automotive environments; no guaranteed 150°C operation. | Select when higher output current is needed and 60V transients are not present. |
| MPQ4420AGL-A-Z | 36V max input, 2A output, 8-pin SOIC-EP, no SYNC or PG pin, no FMEA fault tolerance, lower IQ (25μA). | Cost-optimized for consumer/industrial use; not AEC-Q200 qualified or rated for 150°C junction. | Select for cost-sensitive, non-automotive applications requiring higher current and smaller package. |
Compared with LTC3631EMSE#TRPBF and MPQ4420AGL-A-Z, the LT3695HMSE#TRPBF uniquely combines 60V transient survival, FMEA-compliant pin-fault tolerance, and –40°C to +150°C guaranteed operation - making it the only choice for safety-critical automotive under-hood power conversion where reliability under fault conditions is non-negotiable.
Availability
LT3695HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and automotive entertainment systems requiring stable component supply across extended temperature and transient-voltage conditions.
Supply support for LT3695HMSE#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, qualification, and manufacturing continuity for all Linear-branded power management ICs.
The LT3695 series belongs to Linear's fault-tolerant monolithic buck regulator product line, engineered specifically for automotive and industrial applications demanding resilience to wiring faults, voltage transients, and extreme ambient temperatures.
FAQ
What is the maximum input voltage transient the LT3695HMSE#TRPBF can survive?
The LT3695HMSE#TRPBF is rated to safely withstand nonrepetitive 60V transients for up to 1 second without damage or latch-up. During such events, its overvoltage lockout circuit disables switching when VIN exceeds ~38V (typical), allowing the output to fall out of regulation temporarily while protecting internal circuitry. Continuous operation remains limited to 36V.
Does the LT3695HMSE#TRPBF require an external catch diode?
Yes, the LT3695HMSE#TRPBF requires an external Schottky catch diode connected between the DA pin and PGND. The device monitors current through this diode via the DA pin to implement frequency foldback during overload or short-circuit conditions. Diode selection must consider forward voltage (~720–900mV at 50mA) and reverse leakage (<1μA at 10V).
How does the LT3695HMSE#TRPBF achieve fault tolerance on adjacent pins?
The LT3695HMSE#TRPBF implements hardware-level FMEA compliance: output voltage remains at or below the programmed regulation level even if any two adjacent pins are shorted or one pin is left floating. This is achieved through dedicated internal sensing and clamping circuitry - not software or external components - ensuring deterministic behavior under fault conditions per ISO 26262 ASIL-B requirements.
What is the purpose of the BD pin on the LT3695HMSE#TRPBF?
The BD (Boost Diode) pin on the LT3695HMSE#TRPBF connects to the anode of the external Schottky 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 efficiency at light loads. BD must be connected - leaving it open disables bias regulation and may cause startup failure.
Can the LT3695HMSE#TRPBF operate at 2.2MHz switching frequency?
Yes, the LT3695HMSE#TRPBF supports 2.2MHz operation using an 8.06kΩ resistor from RT to GND. However, at this frequency, minimum input voltage increases and maximum input voltage decreases due to fixed minimum on-time (150ns) and off-time (210ns). For 2.2MHz, ensure VIN stays within calculated limits - e.g., for 5V output, max VIN ≈ 14V - to avoid dropout or regulation loss.
LT3695HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3695HMSE#TRPBF FAQ
1.How can I place an order for LT3695HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695HMSE#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#TRPBF reliable?
The price and inventory of LT3695HMSE#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3695HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695HMSE#TRPBF?
LT3695HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695HMSE#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#TRPBF?
For technical support, including LT3695HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3695HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3695HMSE#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3695HMSE#TRPBF?
All LT3695HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695HMSE#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3695HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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