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Analog Devices Inc. LT3995EMSE#TRPBF
- Part No.:
- LT3995EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3995EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:890
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Product details
Overview
LT3995EMSE#TRPBF from Analog Devices is a monolithic 60V, 3A synchronous step-down switching regulator with 2.7µA quiescent current, adjustable 200kHz–2MHz switching frequency, and low-ripple Burst Mode® operation. It features an internally compensated current-mode topology, 85mΩ integrated NPN switch, programmable undervoltage lockout (1.02V EN threshold), power good flag, and soft-start-designed for automotive cold-crank battery regulation and portable industrial supplies.
For engineers reviewing the LT3995EMSE#TRPBF datasheet, LT3995EMSE#TRPBF pinout, LT3995EMSE#TRPBF application, or LT3995EMSE#TRPBF equivalent, key selection criteria include ultralow IQ (2.7µA no-load), dropout performance (500mV min), AEC-Q100 qualification (E-grade), thermal derating limits, and RT-resistor–programmed frequency stability across temperature.
Technical Context
The LT3995EMSE#TRPBF implements a constant-frequency current-mode control architecture with internal slope compensation and VC-node clamping for fast transient response and loop stability. Its bipolar NPN power switch is driven via an external BOOST capacitor to ensure full saturation down to 500mV dropout, enabling reliable operation during automotive cold-crank events.
Burst Mode® operation reduces no-load supply current to 2.7µA while maintaining output ripple below 15mVP-P using synchronized sleep cycles; frequency foldback below 200kHz occurs when FB voltage drops during startup or overload, limiting inrush and short-circuit power dissipation via current limit foldback (3.1A at VFB = 0V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.3V to 60V - supports wide automotive and industrial input transients including cold-crank (≥4.3V min) |
| Max Output Current | 3A - sustained load capability with thermal shutdown and current limit foldback protection |
| Quiescent Current | 2.7µA at no load - enables >10-year battery life in always-on automotive modules |
| Switching Frequency | 200kHz to 2MHz - RT-resistor programmable; synchronizable 250kHz–2MHz for EMI control |
| Feedback Reference | 1.197V ±1.2% - high-accuracy reference enables ±1.5% output regulation over temp and line |
| Dropout Voltage | 500mV - enforced minimum VIN–VOUT differential maintains boost capacitor charge and switch saturation |
| Power Good Threshold | 91.6% of VOUT - open-drain PG flag asserts when FB reaches regulation within 8.4% hysteresis |
| Operating Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade E for under-hood automotive use |
Pinout & Package
LT3995EMSE#TRPBF is housed in a thermally enhanced 16-lead MSOP package with exposed pad (Pin 17 = GND), θJA = 40°C/W. The exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (1) | Feedback input | Regulates to 1.197V; connects to resistor divider tap; requires 10pF phase lead cap to VOUT for stability |
| SS (2) | Soft-start control | 1.8µA internal pull-up; external capacitor ramps peak current limit at startup; actively discharged during shutdown |
| OUT (3) | Output sense / bias source | Connects to output (≤16V); supplies internal regulator when VOUT > 3.2V; input to dropout comparator |
| BOOST (4) | Switch gate drive boost | Drives internal NPN switch; requires external capacitor referenced to SW; max 75V rating |
| SW (5,6,7) | Switch node | High-current output of internal NPN switch; connects to inductor, catch diode, and BOOST cap |
| NC (8,9) | No connect | Not bonded; must remain unconnected on PCB |
| VIN (10,11,12) | Main power input | Supplies internal circuitry and switch; local bypassing required; absolute max 60V |
| EN (13) | Enable input | Hysteretic threshold (1.02V fall / 1.08V rise); accurate UVLO programming; 700nA shutdown current |
| RT (14) | Frequency set | Resistor to GND sets fSW from 200kHz–2MHz; tolerance impacts frequency accuracy ±10% |
| PG (15) | Power good flag | Open-drain output; pulls low when FB < 91.6% of target; valid only if VIN > 2V |
| SYNC (16) | External clock sync | Ground for Burst Mode; tie to external clock (250kHz–2MHz) for pulse-skipping; do not float |
| GND (17) | Ground reference | Exposed pad; must be soldered to PCB ground plane for thermal and electrical performance |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.7µA no-load IQ enables multi-year operation from coin cells or vehicle batteries in standby |
| Low-ripple Burst Mode® | Maintains <15mVP-P ripple with two 47µF ceramic caps; eliminates audible noise and EMI spikes |
| Thermally robust MSOP-16EP | θJA = 40°C/W with exposed pad soldered; supports 3A continuous output at +85°C ambient |
| Automotive-grade reliability | AEC-Q100 Grade E qualified (–40°C to +125°C junction); controlled manufacturing for automotive applications |
| Programmable UVLO & soft-start | EN pin threshold (1.02V) allows precise system-level brownout detection; SS capacitor controls inrush current |
| Robust dropout performance | 500mV enforced dropout preserves boost voltage during cold-crank, ensuring switch saturation and regulation |
Applications
| Automotive Battery Regulation | Portable Industrial Sensors |
|---|---|
Use Scenario: Powering always-on telematics modules and CAN transceivers directly from 12V vehicle battery, surviving cold-crank (4.5V) and load-dump (60V) events. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3V/5V rail with ultralow IQ and guaranteed dropout behavior during cranking. Use Value: Eliminates need for external pre-regulator or LDO; extends battery life >10× vs conventional regulators due to 2.7µA IQ. | Use Scenario: Powering wireless sensor nodes (LoRaWAN, NB-IoT) deployed in remote infrastructure with 10+ year battery requirements. IC Role / Device Role / Timing Role: Main power converter delivering regulated 3.3V from primary lithium-thionyl chloride or alkaline cells. Use Value: Achieves >15-year shelf life by minimizing no-load current; Burst Mode® ensures clean wake-up without output droop. |
| Industrial Control I/O Modules | Railway Signaling Systems |
Use Scenario: Supplying isolated microcontrollers and analog front-ends in DIN-rail mounted PLC I/O modules powered from 24VDC industrial bus. IC Role / Device Role / Timing Role: High-reliability DC/DC stage converting 24V to 5V/3.3V with immunity to line surges and extended temperature operation. Use Value: AEC-Q100 qualification and –40°C to +125°C range ensure field reliability; 60V abs max withstands 48V transients. | Use Scenario: Powering safety-critical signaling logic in EN 50121-compliant railway electronics operating from 72V–110V nominal battery. IC Role / Device Role / Timing Role: Pre-regulator stepping 110V down to 12V for downstream isolated converters, handling wide input variation and long hold-up times. Use Value: 60V input rating and 500mV dropout enable direct connection to traction battery; RT-programmable fSW simplifies EMI filtering design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3639EMSE#TRPBF | 40V max input, 2A output, 3.5µA IQ, fixed 1.2V ref, no SYNC pin | Lower voltage/current capability; lacks frequency synchronization and programmable UVLO | Choose for cost-sensitive 24V systems where 2A suffices and sync is unnecessary |
| MPQ4420AGL-A-Z | 40V max input, 2A output, 20µA IQ, 0.8V ref, no PG or SS, QFN-10 | Higher IQ, no power good or soft-start; smaller package but higher thermal resistance | Choose for space-constrained non-automotive designs where PG and soft-start are optional |
Compared with LTC3639EMSE#TRPBF and MPQ4420AGL-A-Z, LT3995EMSE#TRPBF delivers superior automotive readiness (60V/3A/AEC-Q100), lowest IQ (2.7µA), and comprehensive protection (PG, SS, foldback, thermal shutdown), making it optimal for mission-critical battery-powered systems requiring long service life and cold-crank resilience.
Availability
LT3995EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable industrial sensors, and railway signaling systems requiring stable component supply, long-lifecycle support, and AEC-Q100 compliance.
Supply support for LT3995EMSE#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, industrial automation, and automotive markets.
The LT3995 product line was designed specifically for ultralow-power, high-input-voltage DC/DC conversion in automotive and industrial environments where cold-crank survival, long battery life, and AEC-Q100 reliability are mandatory.
FAQ
What is the maximum input voltage rating for LT3995EMSE#TRPBF?
The LT3995EMSE#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pins. It operates continuously from 4.3V to 60V, with guaranteed performance across the full range. During transients exceeding normal operating voltage (e.g., load dump), the part remains functional up to its absolute max rating, though pulse-skipping may occur above VIN(OP-MAX) to maintain regulation. Always observe layout best practices for high-voltage stress.
Does LT3995EMSE#TRPBF require an external catch diode?
No, the LT3995EMSE#TRPBF integrates a BOOST Schottky diode on-die and does not require an external catch diode. The internal diode is rated for 100mA forward current and exhibits 800mV typical forward voltage at 100mA. External diodes are unnecessary and would degrade efficiency and increase board area. The OUT pin connects directly to the cathode of this internal diode.
How is the switching frequency set on LT3995EMSE#TRPBF?
The switching frequency of LT3995EMSE#TRPBF is set by an external resistor (RT) connected between Pin 14 (RT) and GND. Values from 14.7kΩ (2.0MHz) to 294kΩ (200kHz) are supported, with a recommended tolerance ≤1%. The RT value determines oscillator frequency via internal current source; Table 1 in the datasheet provides exact RT values for target frequencies. Frequency is also synchronizable to an external clock (250kHz–2MHz) via the SYNC pin.
What is the purpose of the OUT pin on LT3995EMSE#TRPBF?
The OUT pin on LT3995EMSE#TRPBF serves three critical functions: (1) it connects to the anode of the internal BOOST Schottky diode, (2) it supplies bias current to the internal regulator when VOUT > 3.2V (improving efficiency), and (3) it feeds the dropout comparator that enforces a 500mV minimum VIN–VOUT differential. For all standard applications, OUT must be connected directly to the output node (≤16V).
Is LT3995EMSE#TRPBF pin-compatible with other Linear Technology buck regulators?
No, LT3995EMSE#TRPBF is not pin-compatible with other Linear Technology buck regulators. Its 16-pin MSOP package with unique pinout-including dual SW pins (5,6,7), dedicated BOOST (4), OUT (3), and exposed-pad GND (17)-is specific to the LT3995 family. Substitution requires full schematic and layout revision. Always verify pin mapping and thermal pad connection before replacement.
LT3995EMSE#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):
- 4.3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.197V
- Voltage - Output (Max):
- 55.8V
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz ~ 2.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3995EMSE#TRPBF FAQ
1.How can I place an order for LT3995EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3995EMSE#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 LT3995EMSE#TRPBF reliable?
The price and inventory of LT3995EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3995EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3995EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3995EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3995EMSE#TRPBF?
LT3995EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3995EMSE#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 LT3995EMSE#TRPBF?
For technical support, including LT3995EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3995EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3995EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3995EMSE#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 LT3995EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3995EMSE#TRPBF?
All LT3995EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3995EMSE#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 LT3995EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3995EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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