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Analog Devices Inc. LT3695HMSE-3.3#TRPBF
- Part No.:
- LT3695HMSE-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695HMSE-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,761
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Product details
Overview
LT3695HMSE-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a fault-tolerant 1A monolithic buck switching regulator with fixed 3.3V output, 36V max continuous input, 60V transient tolerance, and thermally enhanced 16-pin MSOP package rated for –40°C to 150°C junction temperature. It delivers low-ripple Burst Mode operation (<15mVP-P), 75μA no-load quiescent current (12VIN→3.3VOUT), and integrated power-good flag - deployed in automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT3695HMSE-3.3#TRPBF datasheet, LT3695HMSE-3.3#TRPBF pinout, LT3695HMSE-3.3#TRPBF application, or LT3695HMSE-3.3#TRPBF equivalent, key selection criteria include FMEA-compliant adjacent-pin-short immunity, adjustable frequency (250kHz–2.2MHz) via RT resistor, SYNC-controlled mode selection (Burst vs PWM), thermal grade H qualification, and fixed-output voltage stability across –40°C to 150°C.
Technical Context
The LT3695HMSE-3.3#TRPBF implements current-mode control with internal 0.8V reference and fixed-output feedback network tied to OUT1/OUT2 pins. Its bipolar NPN switch is driven by a BOOST-capacitor-based charge pump enabling full saturation at high VIN, while DA-pin sensing enables frequency foldback during overload and short-circuit events.
Fault tolerance is enforced via hardware-level design: open or shorted NC pins (3, 10, 12) do not raise VOUT above 3.3V; PG remains valid only when OUT1/OUT2 reaches 90% of regulation; and overvoltage lockout disables switching above ~38V (sustaining 60V transients). RUN/SS provides shutdown (<1μA IQ) and soft-start via external RC ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over –40°C to 150°C - eliminates external feedback resistors and ensures stable rail for MCU I/O or FPGA core logic. |
| Input Voltage Range | 3.6V to 36V continuous, 60V non-repetitive transient - supports 12V/24V automotive batteries and industrial 24V/36V rails with robust surge immunity. |
| Max Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and communication ICs without external current boosting. |
| Quiescent Current | 75μA at 12VIN → 3.3VOUT, no load - enables always-on subsystems in battery-backed applications with multi-year runtime. |
| Switching Frequency | 250kHz to 2.2MHz, set by RT resistor - allows optimization of inductor size (e.g., 4.7μH at 2MHz) versus efficiency (e.g., 10μH at 800kHz). |
| Thermal Grade | H-grade: –40°C to 150°C junction - qualified for under-hood automotive and high-ambient industrial environments without derating. |
| Power Good Flag | Open-collector PG asserts high when OUT1/OUT2 ≥ 90% of 3.3V - provides system-level reset sequencing and supply monitoring without external comparators. |
Pinout & Package
LT3695HMSE-3.3#TRPBF uses a 16-pin plastic MSOP package with exposed thermal pad (Pin 17), θJA = 40°C/W when pad is soldered. Package dimensions: 4.0mm × 3.0mm × 0.85mm, lead pitch 0.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power ground return for catch diode | Must be connected to low-impedance PCB ground plane; exposed pad soldering reduces thermal resistance by >65%. |
| DA (2) | Catch diode anode sense input | Monitors diode current to trigger frequency foldback during overload; requires Schottky diode anode connection. |
| NC (3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to preserve FMEA fault tolerance - no pull-up/down or routing. |
| SW (4) | Internal switch node | Connects to inductor, boost capacitor, and cathode of external Schottky catch diode - high dV/dt node requiring tight layout. |
| RUN/SS (5) | Enable and soft-start control | Tie ≥2.5V for operation; <0.2V for shutdown; RC network here sets output voltage ramp rate during startup. |
| RT (6) | Oscillator frequency programming | Resistor to GND sets switching frequency (e.g., 40.2kΩ = 800kHz); determines inductor/capacitor sizing trade-offs. |
| SYNC (7) | External clock synchronization input | Accepts 300kHz–2.2MHz clock; selects Burst Mode (low ripple) or PWM (low noise) based on logic level or edge timing. |
| VIN (8) | Main input power supply | Supplies internal bias regulator and switch driver; requires local 10μF ceramic bypass near pin. |
| VC (9) | Error amplifier output | Controls peak switch current; external compensation network (RC) stabilizes loop response and transient performance. |
| PG (11) | Power good open-collector output | Sinks current when OUT1/OUT2 < 90% of 3.3V; requires external pull-up to monitored rail or logic supply. |
| GND (12) | Analog ground reference | Reference for internal circuitry; tie directly to clean analog ground plane, separate from PGND if possible. |
| OUT1/OUT2 (13, 14) | Fixed 3.3V output and feedback nodes | Deliver regulated 3.3V; internally connected to precision divider - no external resistors needed. |
| BD (15) | Bias diode anode input | Optional external bias source (>3V) improves efficiency by powering internal regulator independently of VIN. |
| BOOST (16) | Charge pump drive for switch | Connect 0.22μF capacitor to SW; generates >VIN voltage to fully saturate bipolar NPN switch for low VCESAT. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA fault tolerance | Guaranteed VOUT ≤ 3.3V during adjacent-pin shorts or floating NC pins - eliminates risk of downstream overvoltage damage in safety-critical systems. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while holding IQ at 75μA - avoids audible noise and preserves efficiency in standby modes. |
| 60V transient survival | Withstands 60V/1s non-repetitive transients without latch-up or degradation - meets ISO 7637-2 Pulse 1/2/5a requirements for automotive electronics. |
| Thermal grade H qualification | Full electrical performance guaranteed from –40°C to 150°C junction - enables placement near engines, power converters, or enclosed enclosures without thermal derating. |
| Integrated power-good flag | PG output validates regulation status at OUT1/OUT2 with 50mV hysteresis - simplifies system power sequencing and eliminates need for discrete supervisor ICs. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.3V for infotainment head unit microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, fault-tolerant 3.3V rail with transient immunity against load dump and jump-start events. Use Value: Eliminates need for external TVS + LDO cascade; 60V transient rating and FMEA compliance reduce BOM count and improve ASIL-B readiness. | Use Scenario: Powering PLC I/O modules from 24V factory bus where space and thermal management are constrained. IC Role / Device Role / Timing Role: Compact, high-temp buck regulator delivering 1A at 3.3V with minimal external components and no heatsink. Use Value: 150°C junction rating allows direct mounting on dense PCBs; low IQ extends uptime in battery-buffered backup scenarios. |
| Automotive Entertainment Systems | Distributed Sensor Networks |
Use Scenario: Supplying 3.3V to camera module image signal processor (ISP) and MIPI interface in ADAS domain controller. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source synchronized to system clock via SYNC pin to avoid beat frequencies in video data paths. Use Value: SYNC-enabled Burst Mode suppresses switching artifacts in analog video signals; PG flag confirms rail stability before frame capture. | Use Scenario: Powering wireless sensor nodes (e.g., LoRaWAN temperature/humidity sensors) in remote industrial locations. IC Role / Device Role / Timing Role: Always-on 3.3V supply with ultra-low 75μA no-load IQ, enabling multi-year battery life using primary lithium cells. Use Value: No external feedback or compensation required - reduces footprint and assembly cost while maintaining ±1.5% output accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE#TRPBF | Same 16-pin MSOP package, 3.3V fixed output, but rated only to 125°C (E-grade); lacks BD pin and 60V transient rating. | Not suitable for under-hood automotive or high-ambient industrial use; lower thermal margin requires larger copper area or forced air. | Select only when ambient temperature stays below 85°C and 60V transients are absent. |
| MPQ4420AGL-AEC1-P | Automotive AEC-Q200 qualified, 36V input, but adjustable output (requires external resistors); no PG flag or SYNC pin. | Requires additional components for 3.3V setting and power monitoring; lacks Burst Mode control and FMEA fault tolerance. | Choose when AEC-Q200 certification is mandatory but fixed 3.3V and PG are handled externally. |
Compared with LTC3630EMSE#TRPBF and MPQ4420AGL-AEC1-P, LT3695HMSE-3.3#TRPBF uniquely combines H-grade 150°C operation, integrated 3.3V feedback, 60V transient survival, and FMEA-compliant pin-fault behavior - making it optimal for space-constrained, high-reliability automotive and industrial point-of-load designs.
Availability
LT3695HMSE-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supply, automotive entertainment systems, and distributed sensor networks requiring stable component supply across extended temperature ranges and harsh electrical environments.
Supply support for LT3695HMSE-3.3#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 high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LT3695 series was designed specifically for fault-tolerant, high-input-voltage DC/DC conversion in automotive and industrial environments where reliability under voltage transients and pin faults is critical.
FAQ
What is the maximum continuous input voltage rating for the LT3695HMSE-3.3#TRPBF?
The LT3695HMSE-3.3#TRPBF supports continuous input voltages up to 36V. It also safely withstands non-repetitive 60V transients for up to 1 second per Absolute Maximum Ratings - a key feature for automotive load-dump protection. Operation above 38V triggers overvoltage lockout, halting switching until VIN drops below threshold.
Does the LT3695HMSE-3.3#TRPBF require external feedback resistors to set the 3.3V output?
No. The LT3695HMSE-3.3#TRPBF integrates precision internal feedback resistors for its fixed 3.3V output, eliminating external resistor networks. This reduces component count, improves accuracy (±1.5% over temperature), and enhances long-term stability - unlike adjustable variants such as the base LT3695.
How does the LT3695HMSE-3.3#TRPBF achieve fault tolerance during adjacent pin shorts?
The LT3695HMSE-3.3#TRPBF achieves FMEA-compliant fault tolerance through hardware-level design: NC pins (3, 10, 12) are internally unconnected, and internal circuitry ensures VOUT cannot exceed the programmed 3.3V even if those pins short to VIN, GND, or each other - verified per manufacturer test conditions in the datasheet.
What is the purpose of the BD pin on the LT3695HMSE-3.3#TRPBF?
The BD pin on the LT3695HMSE-3.3#TRPBF accepts an external bias voltage >3V to power the internal regulator independently of VIN. When active, this reduces power dissipation in the bias chain and improves overall efficiency - especially beneficial in high-VIN, low-VOUT applications like 24V-to-3.3V conversion.
Can the LT3695HMSE-3.3#TRPBF be synchronized to an external clock, and what modes does SYNC enable?
Yes. The SYNC pin on the LT3695HMSE-3.3#TRPBF accepts external clocks from 300kHz to 2.2MHz. Grounding SYNC via 100kΩ enables low-ripple Burst Mode for light loads; applying ≥0.8V enables pulse-skipping mode; and driving with a clean clock synchronizes switching to avoid beat frequencies - all without changing the LT3695HMSE-3.3#TRPBF's fixed 3.3V output.
LT3695HMSE-3.3#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):
- 3.3V
- 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-3.3#TRPBF FAQ
1.How can I place an order for LT3695HMSE-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695HMSE-3.3#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-3.3#TRPBF reliable?
The price and inventory of LT3695HMSE-3.3#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-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3695HMSE-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695HMSE-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695HMSE-3.3#TRPBF?
LT3695HMSE-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695HMSE-3.3#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-3.3#TRPBF?
For technical support, including LT3695HMSE-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695HMSE-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3695HMSE-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3695HMSE-3.3#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-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3695HMSE-3.3#TRPBF?
All LT3695HMSE-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695HMSE-3.3#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-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3695HMSE-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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