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Analog Devices Inc. LT3695EMSE-5#PBF
- Part No.:
- LT3695EMSE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3695EMSE-5#PBF.pdf
- Description:
- IC REG BUCK 5V 1A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
LT3695EMSE-5#PBF from Analog Devices (formerly Linear Technology) is a fault-tolerant 1A monolithic buck switching regulator with fixed 5V output, wide 3.6V–36V input range, and 60V transient survivability. It features current-mode control, low-ripple Burst Mode operation (<15mVP-P), power-good flag, and adjustable frequency (250kHz–2.2MHz) via external RT resistor - used in automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT3695EMSE-5#PBF datasheet, LT3695EMSE-5#PBF pinout, LT3695EMSE-5#PBF application, or LT3695EMSE-5#PBF equivalent, key selection criteria include its FMEA-compliant adjacent-pin-short tolerance, 75μA no-load quiescent current at 12VIN/5VOUT, thermal shutdown, frequency foldback, and MSOP-16 package with exposed pad for enhanced thermal performance.
Technical Context
The LT3695EMSE-5#PBF implements constant-frequency current-mode PWM control with internal bipolar NPN switch, integrated boost diode, and error amplifier driving the VC pin to regulate output. Its oscillator supports synchronization (300kHz–2.2MHz) and mode selection (Burst vs. PWM) via SYNC pin voltage level.
Fault tolerance is achieved through hardware-level FMEA design: open pins or adjacent shorts do not cause overvoltage at VOUT; PG flag asserts when output reaches 90% of 5V; and DA-pin sensing enables frequency foldback during catch-diode overcurrent conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% (guaranteed over –40°C to 125°C) |
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V/1s transients without latch-up |
| Max Output Current | 1.0A (minimum guaranteed at VIN > 12V; 0.9A at VIN > 6.9V) |
| Quiescent Current | 75μA typical at 12VIN/5VOUT in Burst Mode, <1μA in shutdown |
| Switching Frequency | Adjustable 250kHz–2.2MHz via RT resistor; synchronizable to external clock |
| Output Ripple | <15mVP-P in Burst Mode (typical application, 5V out) |
| Protection Features | Thermal shutdown, frequency foldback, short-circuit protection, overvoltage lockout (38V typ) |
Pinout & Package
LT3695EMSE-5#PBF is housed in a thermally enhanced 16-pin MSOP package with exposed pad (θJA = 40°C/W when pad soldered). Pin 17 is the exposed PGND pad, electrically connected to Pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1, 17) | Power ground for catch diode return path | Must be soldered to PCB thermal plane; primary heat dissipation path |
| DA (2) | Catch diode anode sense input | Enables frequency foldback during high valley-current conditions (e.g., overload) |
| NC (3, 10, 12) | No-connect terminals | Internally unconnected; must remain floating to preserve fault tolerance |
| SW (4) | Internal switch drain node | Connects to inductor, boost capacitor, and catch diode cathode |
| RUN/SS (5) | Enable and soft-start control | Logic-high (>2.5V) enables operation; RC ramp on this pin controls output voltage slew rate |
| RT (6) | Oscillator timing resistor input | Resistor to GND sets switching frequency (e.g., 40.2kΩ → 800kHz) |
| SYNC (7) | External clock sync and mode select | Ground via 100kΩ for Burst Mode; ≥0.8V for PWM; external clock edges <1μs rise/fall |
| VIN (8) | Main input supply | Bypass locally with ceramic capacitor; powers internal bias circuitry unless BD/OUT sourced |
| VC (9) | Error amplifier output | Controls peak switch current; requires external compensation network to GND |
| FB (11) | Feedback reference (not used in -5 variant) | Not connected internally for LT3695EMSE-5#PBF; fixed-output version uses internal divider |
| PG (13) | Open-collector power-good flag | Pulls low until VOUT reaches 4.5V (90% of 5V); requires external pull-up |
| GND (14) | Analog ground reference | Return for internal control circuitry; separate from PGND for noise isolation |
| OUT1/OUT2 (13, 14) | Fixed-output voltage nodes | Internally tied to 5V output; connect to boost Schottky anode and feedback resistors (internal) |
| BD (15) | Bias diode input (not used in -5 variant) | Unused in LT3695EMSE-5#PBF; fixed-output versions derive bias from OUT1/OUT2 |
| BOOST (16) | Bootstrap drive for NPN switch | Capacitor between BOOST and SW generates >VIN gate drive for full saturation |
Key Features
| Feature | Design Value |
|---|---|
| FMEA Fault Tolerance | Output remains ≤5V even during adjacent-pin shorts or floating NC pins - critical for automotive safety compliance |
| Low-Ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while drawing only 75μA from input - extends battery life in always-on systems |
| Transient-Robust Input Stage | Sustains 60V/1s transients without damage or regulation loss - meets ISO 7637-2 Pulse 5a requirements |
| Integrated Power-Good Flag | PG asserts high only when VOUT is within ±10% of 5V and RUN/SS is active - enables system-level sequencing and monitoring |
| Thermally Optimized MSOP | Exposed pad reduces θJA to 40°C/W - supports 1A continuous load at 125°C ambient with minimal heatsinking |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery rail to stable 5V for infotainment head units under cold-crank (4.5V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator with overvoltage lockout and fault-tolerant pin architecture. Use Value: Eliminates need for external TVS and pre-regulator stages; ensures uninterrupted 5V supply during ISO 7637-2 transients. | Use Scenario: Providing isolated 5V logic supply in programmable logic controllers (PLCs) with wide-input industrial power rails (18–36V). IC Role / Device Role / Timing Role: Fixed-output buck converter with power-good signaling for FPGA and microcontroller domain sequencing. Use Value: Reduces BOM count by integrating soft-start, PG flag, and thermal protection - simplifies certification for IEC 61000-4 immunity. |
| Automotive Entertainment Systems | Distributed Supply Regulation |
Use Scenario: Powering USB-C host ports and display controllers in rear-seat entertainment modules where space and EMI are constrained. IC Role / Device Role / Timing Role: Compact, low-noise 5V source operating at 2MHz to minimize inductor size and conducted emissions. Use Value: Achieves <15mVP-P ripple in Burst Mode at 10mA load - avoids audible noise in audio subsystems. | Use Scenario: Generating local 5V rails for sensor signal conditioning and ADC reference in multi-node IoT edge devices. IC Role / Device Role / Timing Role: Micropower buck regulator enabling >10-year battery life in wireless sensor nodes. Use Value: 75μA no-load IQ and <1μA shutdown current extend coin-cell or energy-harvesting runtime significantly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE-5#PBF | Same manufacturer, pin-compatible, but uses CMOS switch (lower IQ: 25μA), no BD pin, no DA-based foldback | Lacks 60V transient tolerance (max VIN = 36V); optimized for ultra-low-power, not harsh environments | Select if lowest possible quiescent current is critical and transients are clamped externally |
| MP2451DT-LF-Z | Monolithic 2A buck, 4.5–36V input, fixed 5V, but no PG flag, no Burst Mode, no fault-tolerant pin design | Higher current capability but lacks FMEA compliance and precise light-load regulation | Select for cost-sensitive, non-safety-critical 5V supplies where 60V survival and PG signaling are unnecessary |
Compared with LTC3630EMSE-5#PBF and MP2451DT-LF-Z, the LT3695EMSE-5#PBF uniquely combines 60V transient robustness, hardware-enforced fault tolerance, and low-ripple Burst Mode - making it the only choice for automotive and industrial applications requiring functional safety assurance without external protection circuitry.
Availability
LT3695EMSE-5#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial PLCs, and distributed sensor node power supplies requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT3695EMSE-5#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 high-reliability analog and power management portfolio.
The LT3695 series was designed specifically for harsh-environment DC/DC conversion - emphasizing fault tolerance, transient survivability, and integrated protection for automotive and industrial applications.
FAQ
What is the maximum input voltage the LT3695EMSE-5#PBF can safely withstand?
The LT3695EMSE-5#PBF sustains non-repetitive 60V transients for up to 1 second without damage or regulation loss. Continuous operation is rated up to 36V. When input exceeds ~38V (overvoltage lockout threshold), switching halts to protect downstream circuitry - a key feature for automotive load-dump immunity. This behavior is fully specified in the Absolute Maximum Ratings table and verified across temperature.
Does the LT3695EMSE-5#PBF require external feedback resistors?
No. The LT3695EMSE-5#PBF is a fixed-output variant with internal resistor divider network tied to the OUT1/OUT2 pins, eliminating external FB resistors. The FB pin (Pin 11) is unused and left unconnected. This simplifies layout, improves accuracy (±1.5% over temperature), and reduces component count versus adjustable versions like the base LT3695.
How does the LT3695EMSE-5#PBF achieve fault tolerance on adjacent pins?
The LT3695EMSE-5#PBF implements hardware-level FMEA design: internal circuitry ensures that shorts between any two adjacent pins - including SW-GND, VIN-SW, or RUN/SS-NC - cannot drive the output above its programmed 5V. Similarly, leaving NC pins (3, 10, 12) unconnected does not affect regulation. This is validated per AEC-Q100 stress tests and documented in the "FMEA Fault Tolerant" feature section.
What is the purpose of the DA pin on the LT3695EMSE-5#PBF?
The DA (diode anode) pin monitors current through the external Schottky catch diode. When valley current exceeds ~1.6A, the LT3695EMSE-5#PBF initiates frequency foldback - delaying subsequent switch pulses to limit inductor current during overload or short-circuit events. This protects both the IC and external components without relying on external current-sense circuitry.
Can the LT3695EMSE-5#PBF be synchronized to an external clock?
Yes. The SYNC pin (Pin 7) accepts external clock signals from 300kHz to 2.2MHz with rise/fall times faster than 1μs. When driven by an external source, the LT3695EMSE-5#PBF locks its switching frequency and phase to that clock - reducing EMI in systems with multiple synchronized converters. This capability is confirmed in the Electrical Characteristics table and Typical Performance plots.
LT3695EMSE-5#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:
- 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
LT3695EMSE-5#PBF FAQ
1.How can I place an order for LT3695EMSE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3695EMSE-5#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 LT3695EMSE-5#PBF reliable?
The price and inventory of LT3695EMSE-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3695EMSE-5#PBF is usually 5 days.
3.What payment methods are accepted for LT3695EMSE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3695EMSE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3695EMSE-5#PBF?
LT3695EMSE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3695EMSE-5#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 LT3695EMSE-5#PBF?
For technical support, including LT3695EMSE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3695EMSE-5#PBF requirements.
6.How does Aetrix verify that LT3695EMSE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3695EMSE-5#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 LT3695EMSE-5#PBF meets industry standards.
7.What is the process for return or replacement of LT3695EMSE-5#PBF?
All LT3695EMSE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3695EMSE-5#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 LT3695EMSE-5#PBF part is unused and in its original packaging.
Return procedure for LT3695EMSE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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