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Analog Devices Inc. LT3995EMSE#PBF
- Part No.:
- LT3995EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3995EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:12,005
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Product details
Overview
LT3995EMSE#PBF from Analog Devices is a 60V input, 3A monolithic synchronous step-down switching regulator with current-mode control, 2.7µA no-load quiescent current, adjustable 200kHz–2MHz switching frequency, and 500mV dropout voltage. It integrates an 85mΩ NPN switch, boost Schottky diode, soft-start, power-good flag, and AEC-Q100 qualification for automotive cold-crank battery regulation.
For engineers reviewing the LT3995EMSE#PBF datasheet, LT3995EMSE#PBF pinout, LT3995EMSE#PBF application, or LT3995EMSE#PBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, automotive-grade thermal performance data, and two confirmed alternative regulators with documented functional trade-offs.
Technical Context
The LT3995EMSE#PBF uses an internally compensated current-mode architecture with fast transient response and loop stability across 4.3V–60V input. Its bipolar NPN switch is driven by a charge-pumped BOOST rail enabling full saturation down to 500mV dropout, critical for automotive cold-crank operation.
Burst Mode® operation maintains <15mVP-P output ripple at light loads while sustaining 2.7µA quiescent current; frequency foldback and current limit foldback protect during startup and short-circuit events. The SS pin controls inrush via internal 1.8µA current source, and PG asserts when FB reaches 91.6% of regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.3V to 60V - supports wide automotive battery transients and industrial 48V systems without external pre-regulation. |
| Max Output Current | 3A - sustained delivery with thermal derating on 4-layer PCB (θJA = 40°C/W); foldback limits dissipation during overload. |
| No-Load Quiescent Current | 2.7µA - enables >10-year battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Switching Frequency Range | 200kHz to 2MHz - RT-resistor programmable; higher frequencies reduce inductor/capacitor size but constrain max VIN/VOUT ratio. |
| Feedback Reference Voltage | 1.197V ±1.2% - high-accuracy reference enables ±1.5% output regulation over temperature and line/load conditions. |
| Dropout Voltage | 500mV - enforced minimum (VIN – VOUT) ensures boost capacitor remains charged and switch stays saturated during cold-crank. |
| Power Good Threshold | 91.6% of VOUT - open-drain PG signal provides reliable system power sequencing with 8.4% hysteresis. |
| Shutdown Current | 700nA - ultra-low EN-off leakage preserves battery energy in deep sleep states. |
Pinout & Package
LT3995EMSE#PBF is housed in a thermally enhanced 16-lead MSOP package with exposed GND pad (Pin 17), requiring soldering to PCB for θJA = 40°C/W performance. Package dimensions: 4.0mm × 3.0mm × 0.85mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (1) | Feedback input | Regulated to 1.197V; sets output voltage via resistor divider; requires 10pF phase-lead cap for stability. |
| SS (2) | Soft-start control | Internal 1.8µA current source ramps peak current limit; actively discharged during shutdown/UVLO. |
| OUT (3) | Output sense & bias source | Connects to regulated output (≤16V); supplies internal bias when VOUT > 3.2V, improving efficiency. |
| BOOST (4) | Switch gate drive booster | Charged externally to >VIN; enables full saturation of internal NPN switch for low dropout and high efficiency. |
| SW (5,6,7) | Switch node | High-current output to inductor/catch diode/boost cap; multiple pins reduce parasitic inductance and thermal resistance. |
| NC (8,9) | No connect | Not bonded; must remain unconnected per datasheet to avoid latch-up or parametric shift. |
| VIN (10,11,12) | Main power input | Supplies internal circuitry and switch; local 10µF ceramic bypass required at each pin for EMI suppression. |
| EN (13) | Enable with UVLO | Hysteretic threshold (1.02V↓ / 1.08V↑); accurate programmable undervoltage lockout for battery monitoring. |
| RT (14) | Frequency set | Resistor to GND programs 200kHz–2MHz; tolerance directly impacts frequency accuracy (±10% typical). |
| PG (15) | Power good flag | Open-drain output active low until FB reaches 91.6% of target; valid only when VIN > 2V. |
| SYNC (16) | External clock sync | Ground for Burst Mode; tie to external clock (250kHz–2MHz) for pulse-skipping; floating prohibited. |
| GND (17) | Power ground | Exposed thermal pad; must be soldered to ≥1cm² copper pour for thermal reliability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.7µA at no load enables >10-year battery life in always-on automotive electronics without compromising regulation. |
| Low-ripple Burst Mode® | Maintains <15mVP-P output ripple with two 47µF ceramic caps-critical for noise-sensitive analog/RF subsystems. |
| AEC-Q100 qualified | Rated for –40°C to 125°C junction temperature (E-grade); validated for automotive battery regulation including cold-crank. |
| Saturating NPN switch | 85mΩ RCE(SAT) at 1A enables high efficiency (>90% at 1A, 12V→3.3V) and 500mV dropout under full load. |
| Integrated boost Schottky | On-die 800mV forward drop at 100mA eliminates external boost diode, reducing BOM count and layout area. |
| Thermal shutdown + foldback | Combines current limit foldback (3.1A at VFB=0V) and thermal shutdown to prevent damage during sustained overload. |
Applications
| Automotive Battery Regulation | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powering always-on telematics control units (TCUs) and ADAS cameras during vehicle ignition-off state with 12V lead-acid battery. IC Role / Device Role / Timing Role: Primary buck regulator maintaining 3.3V/5V rails through cold-crank (4.5V transients) and extended parking (10+ year battery life). Use Value: 2.7µA IQ extends lithium-thionyl chloride battery life beyond 10 years; 500mV dropout sustains regulation at 4.8V input. |
Use Scenario: Supplying ultra-low-power wearable ECG monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Main power converter delivering stable 3.3V from 3.6V Li-MnO₂ cell with dynamic load steps (10mA → 200mA). Use Value: Burst Mode® keeps output ripple <15mV while drawing only 2.7µA at standby-enabling weeks of continuous sensing. |
| Industrial IoT Edge Nodes | Railway Signaling Modules |
|
Use Scenario: Powering LoRaWAN gateways deployed in remote substations with 24V–48V DC distribution rails. IC Role / Device Role / Timing Role: Input-stage buck converting 48V to 5V for microcontroller and RF front-end, surviving 60V surges. Use Value: 60V absolute max input and robust thermal shutdown allow operation in unregulated industrial environments without derating. |
Use Scenario: Regulating 110VDC onboard signaling logic in rolling stock where input varies 70V–137V due to regenerative braking. IC Role / Device Role / Timing Role: Pre-regulator stepping 110V to 12V for downstream isolated DC/DC converters in safety-critical systems. Use Value: Adjustable frequency (200kHz–2MHz) enables optimal EMI filtering; AEC-Q100 grade validates reliability for railway certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3639EMSE#PBF | 40V max input, 2A output, 3.5µA IQ, fixed 1.2V ref; no SYNC or PG; smaller 12-lead MSOP. | Better suited for space-constrained 24V industrial sensors where 60V rating is unnecessary. | Select when lower cost and smaller footprint outweigh need for 60V rating, 3A capability, or PG signaling. |
| TPS54360BQDDAQ1 | 60V max input, 3.5A output, 14µA IQ, integrated FETs, 100% duty cycle; no Burst Mode, no PG, automotive AEC-Q100. | Higher IQ limits battery life; preferred for high-temp engine bay applications needing 100% duty cycle. | Select when 100% duty cycle (VIN ≈ VOUT) is mandatory and ultralow IQ is secondary to thermal robustness. |
Compared with LTC3639EMSE#PBF and TPS54360BQDDAQ1, LT3995EMSE#PBF uniquely combines 60V/3A capability, 2.7µA IQ, Burst Mode® ripple control, and PG flag in a single AEC-Q100-qualified package-making it optimal for automotive and long-life battery-powered systems demanding both performance and reliability.
Availability
LT3995EMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical sensors, industrial IoT edge nodes, and railway signaling modules requiring stable component supply with guaranteed long-term availability.
Supply support for LT3995EMSE#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 (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3995EMSE#PBF belongs to ADI's Power by Linear™ family of high-voltage DC/DC regulators, engineered specifically for automotive cold-crank resilience, ultralow IQ battery longevity, and robust operation in harsh industrial environments.
FAQ
What is the maximum input voltage supported by the LT3995EMSE#PBF?
The LT3995EMSE#PBF supports up to 60V input continuously, with absolute maximum ratings allowing brief transients to 60V on VIN and 75V on BOOST. Operation above 60V violates specifications and risks permanent damage. For sustained 60V operation, thermal design must ensure junction temperature remains ≤125°C using the exposed pad and proper PCB copper area.
How does the LT3995EMSE#PBF achieve 2.7µA quiescent current?
The LT3995EMSE#PBF achieves 2.7µA quiescent current via low-ripple Burst Mode® operation: it delivers discrete current pulses to the output capacitor, then enters deep sleep consuming only 1.7µA between bursts. Total no-load IQ is 2.7µA in typical applications due to minimal feedback divider current and Schottky diode leakage-both must be minimized (MΩ-level resistors, µA-level diode leakage) to reach spec.
Can the LT3995EMSE#PBF operate in 100% duty cycle mode?
No-the LT3995EMSE#PBF cannot operate in true 100% duty cycle. When VIN drops near VOUT, it enforces a minimum 500mV dropout (VIN – VOUT ≥ 500mV) and reduces switching frequency to maintain regulation. This prevents full pass-through but ensures the internal boost capacitor remains charged for switch saturation, distinguishing it from 100% duty-cycle regulators like the TPS54360BQDDAQ1.
What is the purpose of the OUT pin on the LT3995EMSE#PBF?
The OUT pin on the LT3995EMSE#PBF serves three roles: (1) input to the dropout comparator enforcing 500mV minimum (VIN – VOUT), (2) anode connection for the internal boost Schottky diode, and (3) bias power source for internal circuitry when VOUT > 3.2V-improving efficiency by reducing VIN current draw during regulation.
Is the LT3995EMSE#PBF pin-compatible with other members of the LT3995 family?
Yes-LT3995EMSE#PBF shares identical pinout and package (16-lead MSOP) with LT3995IMSE#PBF and LT3995HMSE#PBF. Differences are limited to temperature grade (–40°C to 125°C for E-grade) and AEC-Q100 qualification status; all share identical electrical characteristics, timing, and layout requirements.
LT3995EMSE#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):
- 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#PBF FAQ
1.How can I place an order for LT3995EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3995EMSE#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 LT3995EMSE#PBF reliable?
The price and inventory of LT3995EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3995EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3995EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3995EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3995EMSE#PBF?
LT3995EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3995EMSE#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 LT3995EMSE#PBF?
For technical support, including LT3995EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3995EMSE#PBF requirements.
6.How does Aetrix verify that LT3995EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3995EMSE#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 LT3995EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3995EMSE#PBF?
All LT3995EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3995EMSE#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 LT3995EMSE#PBF part is unused and in its original packaging.
Return procedure for LT3995EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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