My Inquiry
My Account
Analog Devices Inc. LT3695HMSE#PBF
- Part No.:
- LT3695HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,095
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3695HMSE#PBF 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 survivability. It integrates a bipolar NPN 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#PBF datasheet, LT3695HMSE#PBF pinout, LT3695HMSE#PBF application, or LT3695HMSE#PBF equivalent, key selection factors include its FMEA-compliant output voltage clamping during adjacent pin shorts, low-ripple Burst Mode operation (<15mVP-P), 75μA no-load quiescent current, thermal grade up to 150°C junction, and MSOP-16 package with exposed pad for enhanced thermal performance.
Technical Context
The LT3695HMSE#PBF uses current-mode control with slope compensation for fast transient response and loop stability across wide input/output ratios. Its oscillator supports programmable frequency via RT resistor and external synchronization (300kHz–2.2MHz), enabling EMI optimization and multi-rail coordination.
Fault tolerance is implemented through hardware-level detection of adjacent pin shorts or floating pins - preventing output overvoltage regardless of external circuit failure. Protection includes frequency foldback during overload, thermal shutdown, short-circuit limiting (1.45A min), and overvoltage lockout at 38V (typical), allowing safe operation during 60V transients.
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 24V/36V automotive and industrial buses. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in distributed supply architectures. |
| Switching Frequency | 250kHz to 2.2MHz (RT-programmable) - allows trade-off between inductor size (e.g., 4.7μH at 2MHz) and efficiency (e.g., >85% at 12V→5V/1A). |
| Feedback Reference | 0.8V ±12mV over –40°C to 150°C - ensures accurate output regulation (e.g., 3.3V ±1%) with standard resistor dividers. |
| Quiescent Current | 75μA typical (12VIN→3.3VOUT, no load) - supports always-on systems with ultra-low standby power budgets. |
| Thermal Grade | –40°C to 150°C junction - qualified for under-hood automotive and high-temperature industrial environments. |
| Package | 16-pin MSOP with exposed thermal pad (θJA = 40°C/W when soldered) - delivers robust thermal performance without heatsinks. |
Pinout & Package
LT3695HMSE#PBF is housed in a thermally enhanced 16-pin MSOP package (0.15mm exposed pad, pitch 0.5mm). The exposed pad must be soldered to PCB ground for optimal thermal dissipation (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power ground for catch diode return path | Must connect to low-impedance ground plane; exposed pad is electrically tied to PGND for thermal and electrical integrity. |
| DA (2) | Catch diode anode sense input | Monitors diode current to trigger frequency foldback during overload or short-circuit - prevents inductor saturation. |
| NC (3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to preserve FMEA fault tolerance - bridging or grounding violates safety design. |
| SW (4) | Switch node output | Drives external inductor and boost capacitor; high dv/dt node requiring tight layout and Kelvin connection to minimize ringing. |
| RUN/SS (5) | Enable and soft-start control | Logic-high (>2.5V) enables regulation; RC network here sets controlled output ramp rate - eliminates inrush current. |
| RT (6) | Oscillator frequency set resistor | Grounded resistor (e.g., 29.4kΩ → 1MHz) programs switching frequency - determines inductor/capacitor sizing and EMI profile. |
| SYNC (7) | External clock synchronization input | Accepts 300kHz–2.2MHz clock; selects between PWM (high sync) or low-ripple Burst Mode (grounded via 100kΩ). |
| VIN (8) | Main input power supply | Supplies internal bias and switch driver; requires local 10μF ceramic bypass close to pin to suppress ripple and transients. |
| VC (9) | Error amplifier output | Controls peak switch current; external RC compensation network stabilizes loop - critical for transient response tuning. |
| FB (11) | Feedback reference input | Regulated to 0.8V; connects to resistor divider from VOUT - sets output voltage per VOUT = 0.8V × (1 + R1/R2). |
| PG (13) | Open-collector power-good flag | Asserts high when VOUT reaches 90% of target (e.g., 4.5V for 5V output); requires external pull-up for system sequencing. |
| GND (14) | Analog ground reference | Reference for internal error amp and comparators; must tie directly to clean analog ground plane, separate from PGND if possible. |
| BD (15) | Boost diode anode supply | Provides bias current to internal regulator when >3V - improves light-load efficiency by reducing VIN current draw. |
| BOOST (16) | Bootstrap drive voltage | Connects to SW via 0.22μF capacitor; generates >VIN voltage to fully saturate bipolar NPN switch - minimizes conduction loss. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-compliant fault tolerance | Output remains ≤ programmed value during adjacent pin shorts or open pins - eliminates need for external crowbar circuits in safety-critical designs. |
| Low-ripple Burst Mode operation | Maintains <15mVP-P output ripple at light loads while drawing only 75μA from VIN - ideal for battery-powered always-on nodes. |
| 60V transient survivability | Withstands automotive load-dump events without latch-up or damage - no external TVS required for ISO 7637-2 Pulse 5a compliance. |
| Programmable frequency with sync | 250kHz–2.2MHz adjustment via RT resistor plus external clock input - enables EMI spread-spectrum and multi-converter phase alignment. |
| Integrated power-good flag | Open-drain PG asserts after VOUT stabilizes within 10% of target - provides reliable reset signaling for downstream processors and FPGAs. |
| Thermal grade up to 150°C | Guaranteed operation over full –40°C to 150°C junction range - suitable for engine control units, motor drives, and enclosed industrial enclosures. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V/5V for infotainment head units and ADAS camera modules. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator with integrated fault protection and transient immunity. Use Value: Eliminates need for external overvoltage clamping and enables single-chip solution compliant with ISO 16750-2 load dump requirements. |
Use Scenario: Providing isolated 5V rails to PLC I/O modules and sensor transmitters in factory automation cabinets. IC Role / Device Role / Timing Role: Local point-of-load regulator with programmable frequency to avoid noise coupling into analog signal paths. Use Value: Reduces BOM count by integrating switch, diode, and controller - simplifies layout and improves MTBF in harsh EMI environments. |
| Automotive Entertainment Systems | High-Temperature Industrial Supplies |
|
Use Scenario: Powering USB-C PD controllers and display timing ICs in rear-seat entertainment systems near HVAC ducts. IC Role / Device Role / Timing Role: Fault-tolerant buck converter with soft-start and power-good sequencing for multi-rail subsystems. Use Value: Ensures uninterrupted operation during cold-cranking (4.5V dips) and hot-cranking (60V spikes) without firmware intervention. |
Use Scenario: Supplying 3.3V to wireless sensor nodes mounted on motors or transformers operating above 100°C ambient. IC Role / Device Role / Timing Role: High-junction-temperature DC/DC regulator with thermal shutdown and derating-aware current limit. Use Value: Delivers full 1A output continuously at 150°C junction - avoids thermal throttling in sealed, fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | 42V input, 3.5A output, Silent Switcher architecture; higher efficiency but larger 16-pin MSE package (no exposed pad). | Preferred for noise-sensitive RF/analog systems due to integrated spread-spectrum and lower EMI; not fault-tolerant like LT3695HMSE#PBF. | Select LT8610EMSE#PBF when EMI is primary constraint and 3.5A output is needed; retain LT3695HMSE#PBF for FMEA-critical automotive functions. |
| TPS54360DGQ | 60V input, 3.5A output, integrated MOSFETs; no fault-tolerance features, 125°C max junction, different pinout. | Suitable for cost-sensitive industrial supplies without pin-fault requirements; lacks Burst Mode ripple control and PG flag. | Choose TPS54360DGQ for higher-current, non-safety-critical applications; LT3695HMSE#PBF remains optimal for ASIL-B–aligned designs. |
Compared with LT8610EMSE#PBF and TPS54360DGQ, the LT3695HMSE#PBF uniquely combines 60V transient survival, FMEA-compliant output clamping, and guaranteed 150°C operation - making it irreplaceable in under-hood automotive and high-reliability industrial power domains.
Availability
LT3695HMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, high-temperature embedded systems, and safety-critical power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3695HMSE#PBF 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 standards.
The LT3695HMSE#PBF belongs to Linear's fault-tolerant monolithic buck regulator family, engineered specifically for automotive and industrial applications demanding robustness against electrical faults, extreme transients, and high ambient temperatures.
FAQ
What is the maximum input voltage the LT3695HMSE#PBF can safely withstand?
The LT3695HMSE#PBF is rated for continuous operation up to 36V and can safely sustain non-repetitive input transients up to 60V for 1 second. During transients exceeding 38V (typical overvoltage lockout threshold), the device halts switching to protect internal circuitry while maintaining safe thermal behavior - a key feature for automotive load-dump immunity without external TVS diodes.
How does the LT3695HMSE#PBF achieve fault tolerance during pin shorts?
The LT3695HMSE#PBF implements hardware-level fault tolerance: if any two adjacent pins are shorted or a pin is left floating, internal circuitry ensures the output voltage never exceeds its programmed value. This behavior is guaranteed across –40°C to 150°C and eliminates reliance on external supervision circuits - a core requirement for ASIL-B functional safety compliance.
What is the purpose of the BD pin on the LT3695HMSE#PBF?
The BD (Boost Diode) pin on the LT3695HMSE#PBF 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, especially in systems with pre-biased outputs.
Can the LT3695HMSE#PBF be synchronized to an external clock?
Yes, the LT3695HMSE#PBF supports external clock synchronization via the SYNC pin, accepting frequencies from 300kHz to 2.2MHz with fast edge rates (<1μs rise/fall). Synchronizing multiple LT3695HMSE#PBF devices eliminates beat frequencies and reduces EMI peaks - essential for multi-rail power systems in automotive ECUs and industrial controllers.
What thermal performance can be expected from the LT3695HMSE#PBF in a standard PCB layout?
With the exposed thermal pad of the LT3695HMSE#PBF soldered to a 2-layer PCB with ≥2 cm² copper area, θJA is 40°C/W. At 1A load and 12V→5V conversion, junction temperature rise is ~40°C above ambient - enabling full-rated operation up to 110°C ambient while staying within the 150°C maximum junction limit.
LT3695HMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3695HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695HMSE#PBF 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#PBF reliable?
The price and inventory of LT3695HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3695HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3695HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695HMSE#PBF?
LT3695HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695HMSE#PBF 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#PBF?
For technical support, including LT3695HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695HMSE#PBF requirements.
6.How does Aetrix verify that LT3695HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3695HMSE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3695HMSE#PBF?
All LT3695HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695HMSE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3695HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3695HMSE#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
