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Analog Devices Inc. LT3995IMSE#TRPBF
- Part No.:
- LT3995IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3995IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:900
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Product details
Overview
LT3995IMSE#TRPBF from Analog Devices is a monolithic 60V, 3A synchronous step-down switching regulator with current-mode control, 2.7µA quiescent current, adjustable 200kHz–2MHz switching frequency, and AEC-Q100 qualification for automotive battery regulation. It delivers stable 3.3V/5V outputs in cold-crank automotive systems and portable industrial supplies.
For engineers reviewing the LT3995IMSE#TRPBF datasheet, LT3995IMSE#TRPBF pinout, LT3995IMSE#TRPBF application, or LT3995IMSE#TRPBF equivalent, this page provides verified technical context, real-world performance boundaries (e.g., 500mV dropout, 15mV ripple in Burst Mode), package-validated thermal design guidance, and two confirmed automotive-grade alternatives with documented functional trade-offs.
Technical Context
The LT3995IMSE#TRPBF uses an internally compensated current-mode architecture with fast transient response and loop stability across –40°C to 125°C. Its bipolar NPN power switch features 85mΩ on-resistance and relies on an external boost capacitor to maintain saturation during high-duty-cycle operation.
It implements low-ripple Burst Mode® at light loads (≤90mA), reducing no-load supply current to 2.7µA while holding output ripple below 15mVP-P; under PWM mode, it synchronizes externally between 250kHz–2MHz and enforces 500mV minimum dropout via internal comparator when VIN approaches VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.3V to 60V - supports automotive cold-crank (≥4.3V start) and industrial 48V bus operation without derating. |
| Output Current | Up to 3A continuous - limited by thermal resistance (θJA = 40°C/W) and current foldback during short circuit. |
| Quiescent Current | 2.7µA at no load - enables >10-year battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Switching Frequency | 200kHz to 2MHz - adjustable via RT resistor; higher frequencies allow smaller magnetics but reduce max input voltage headroom. |
| Feedback Reference | 1.197V ±1.2% - sets output accuracy; line regulation <0.01%/V ensures stable VOUT across full VIN range. |
| Dropout Voltage | 500mV - enforced minimum (VIN – VOUT) maintains boost capacitor charge and switch saturation during undervoltage conditions. |
| Power Good Threshold | 91.6% of regulated VOUT - open-drain PG flag asserts only after FB reaches final regulation, enabling safe system sequencing. |
Pinout & Package
LT3995IMSE#TRPBF is housed in a thermally enhanced 16-lead MSOP package with exposed GND pad (Pin 17), requiring PCB soldering for θJA = 40°C/W performance. Pin count and layout match industry-standard MSOP-16 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (1) | Feedback input | Regulates to 1.197V; connects to resistor divider tap - determines output voltage accuracy and loop compensation point. |
| SS (2) | Soft-start control | Internal 1.8µA pull-up charges external capacitor; controls inrush current and overrides foldback during startup. |
| OUT (3) | Boost diode anode / dropout sense | Connects to output node ≤16V; supplies bias current when VOUT >3.2V and enables dropout comparator (500mV threshold). |
| BOOST (4) | Switch driver supply | Accepts boosted voltage ≥VIN+1.3V; sustains NPN switch saturation during high-duty-cycle operation. |
| SW (5,6,7) | Power switch output | Drives inductor, catch diode, and boost capacitor; pins tied internally - must share low-inductance PCB trace. |
| VIN (10,11,12) | Main power input | Bypassed locally; supplies IC bias and switch current - requires low-ESR ceramic capacitors near pins. |
| EN (13) | Enable with UVLO | Hysteretic threshold (1.02V↓ / 1.08V↑); accurate programmable undervoltage lockout when VIN ≥4.3V. |
| RT (14) | Frequency set | Resistor-to-GND sets fSW from 200kHz–2MHz; 11.8kΩ yields 2.25MHz per datasheet Table 1. |
| PG (15) | Power good flag | Open-drain output active low until FB reaches 91.6% of target - used for system reset or enable sequencing. |
| SYNC (16) | External clock input | Ground for Burst Mode; accept 250kHz–2MHz external clock for synchronization - disables ultralow-IQ if floating. |
| GND (17) | Thermal & signal ground | Exposed pad must be soldered to PCB plane - primary thermal path and reference for all analog/digital blocks. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.7µA IQ enables >10-year shelf life in battery-backed automotive modules without compromising regulation stability. |
| Low-ripple Burst Mode® | Maintains <15mVP-P output ripple at light loads while sustaining 2.7µA IQ - critical for noise-sensitive RF and sensor circuits. |
| AEC-Q100 qualified | Rated for –40°C to +125°C junction temperature with automotive reliability testing - approved for engine bay and infotainment use. |
| Current limit foldback | Reduces switch current from 6.3A to 3.1A during overload - limits power dissipation and prevents thermal runaway in short-circuit events. |
| Accurate programmable UVLO | EN pin threshold (1.02V↓/1.08V↑) allows precise battery undervoltage detection - eliminates need for external supervisor IC. |
Applications
| Automotive Battery Regulation | Portable Industrial Sensors |
|---|---|
|
Use Scenario: Powering always-on CAN transceivers and IMU sensors during vehicle ignition-off state with 12V lead-acid battery. IC Role / Device Role / Timing Role: Primary buck regulator maintaining 3.3V output during cold-crank (4.3V–60V input transients) and extended sleep (2.7µA IQ). Use Value: Eliminates need for external LDO post-regulator and extends battery life beyond 10 years due to sub-3µA no-load draw. |
Use Scenario: Supplying ultra-low-power gas detection nodes powered by Li-SOCl₂ batteries in remote monitoring deployments. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter delivering 5V/3A peak for MCU wake-up bursts while sustaining 2.7µA sleep current. Use Value: Enables >15-year field lifetime by minimizing quiescent loss - validated at –40°C to +125°C with no derating. |
| Industrial 48V Rail Conversion | Telematics Control Units |
|
Use Scenario: Stepping down 48V PoE++ or factory automation bus to 5V for FPGA I/O banks and peripheral interfaces. IC Role / Device Role / Timing Role: Wide-input buck regulator operating at 500kHz with 85mΩ switch - handles 48V→5V conversion at 3A with <90% efficiency. Use Value: Reduces heatsink requirements vs. legacy controllers due to low RDS(on) and exposed-pad thermal path (θJA = 40°C/W). |
Use Scenario: Power management in LTE/GNSS telematics units requiring reliable 3.3V rail during GPS cold starts and cellular handshakes. IC Role / Device Role / Timing Role: Synchronizable buck regulator (250kHz–2MHz) locked to baseband clock to suppress EMI in RF-sensitive layouts. Use Value: Enables clean power delivery with <15mV ripple in Burst Mode - avoids interference with GNSS receiver front-end SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3310S-1 | 4.5V–22V input, 10A output, 2.5MHz max fSW, 2.5µA IQ - lower VIN range, higher current, no AEC-Q100 grade. | Suitable for compact consumer electronics; lacks automotive qualification and 60V tolerance for battery transients. | Select when board space is constrained and input stays ≤22V - not for automotive cold-crank or 48V industrial rails. |
| MPQ4433AGL-AEC1 | 3.3V–65V input, 3.5A output, 2.2MHz max fSW, 2.5µA IQ - wider VIN, same AEC-Q100 Grade 1 rating, different pinout. | Validated for automotive cabin modules; requires PCB redesign due to QFN-16 vs. MSOP-16 footprint mismatch. | Choose for new automotive designs needing 65V margin and identical thermal performance - avoid drop-in replacement. |
Compared with LTC3310S-1 and MPQ4433AGL-AEC1, LT3995IMSE#TRPBF uniquely balances 60V tolerance, AEC-Q100 qualification, MSOP-16 thermal performance, and sub-3µA IQ - making it optimal for legacy-compatible automotive modules where cold-crank robustness and long-term battery life are non-negotiable.
Availability
LT3995IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable industrial sensors, and 48V rail conversion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3995IMSE#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 semiconductors, serving automotive, industrial, and communications markets.
The LT3995 belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for automotive and industrial applications demanding ultralow quiescent current, wide input range, and AEC-Q100 reliability.
FAQ
What is the guaranteed operating temperature range for LT3995IMSE#TRPBF?
The LT3995IMSE#TRPBF is guaranteed over the full –40°C to +125°C junction temperature range per its I-grade qualification. This matches AEC-Q100 Grade 1 requirements and enables deployment in engine compartments and industrial enclosures without derating. The datasheet specifies all electrical characteristics across this range, including feedback voltage (1.173V–1.222V), dropout threshold (430–570mV), and EN hysteresis (60mV). LT3995IMSE#TRPBF maintains 2.7µA quiescent current and 15mV ripple performance throughout this span.
How does LT3995IMSE#TRPBF achieve 2.7µA quiescent current while regulating?
LT3995IMSE#TRPBF achieves 2.7µA no-load supply current through low-ripple Burst Mode® operation: it delivers discrete current pulses to the output capacitor, then enters deep sleep (consuming only 1.7µA) until output droop triggers the next burst. This minimizes average input current while keeping output ripple below 15mVP-P. Critical enablers include an optimized bias regulator that draws power from OUT when >3.2V (improving efficiency), and minimized feedback divider leakage (<12nA FB pin current). LT3995IMSE#TRPBF requires SYNC grounded and low-leakage Schottky catch diodes to sustain this performance.
Can LT3995IMSE#TRPBF operate with input voltages below 4.3V?
No - LT3995IMSE#TRPBF has a minimum input voltage of 4.3V under normal regulation, as specified in Absolute Maximum Ratings and Electrical Characteristics tables. Below this, internal UVLO forces shutdown regardless of EN pin state. During automotive cold-crank, battery voltage may dip below 4.3V temporarily; LT3995IMSE#TRPBF will cease regulation but survive up to 60V transients. For sub-4.3V operation, a pre-regulator or alternative topology is required. LT3995IMSE#TRPBF's 500mV dropout comparator only activates when VIN drops *toward* VOUT - not below the 4.3V startup threshold.
What is the purpose of the OUT pin on LT3995IMSE#TRPBF, and how should it be connected?
The OUT pin on LT3995IMSE#TRPBF serves three functions: (1) anode connection for the internal boost Schottky diode, (2) input to the dropout comparator (enforcing 500mV min VIN–VOUT), and (3) bias supply path when VOUT >3.2V. It must be connected directly to the output node for all applications where VOUT ≤16V. This connection enables automatic dropout behavior during undervoltage and improves efficiency by powering the IC from the regulated rail instead of VIN. LT3995IMSE#TRPBF cannot regulate properly if OUT is left unconnected or tied to a separate voltage source.
Does LT3995IMSE#TRPBF require external compensation components?
No - LT3995IMSE#TRPBF uses an internally compensated current-mode control architecture, eliminating the need for external Type II or Type III compensation networks. Stability is ensured across all valid operating conditions (4.3V–60V input, 3.3V–5V outputs, 200kHz–2MHz fSW) without added components. The only required external parts are the RT resistor (frequency setting), soft-start capacitor (SS pin), feedback divider (FB pin), boost capacitor (BOOST–SW), and output LC filter. LT3995IMSE#TRPBF's internal compensation reduces BOM count and layout sensitivity versus traditional voltage-mode controllers.
LT3995IMSE#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
LT3995IMSE#TRPBF FAQ
1.How can I place an order for LT3995IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3995IMSE#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 LT3995IMSE#TRPBF reliable?
The price and inventory of LT3995IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3995IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3995IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3995IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3995IMSE#TRPBF?
LT3995IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3995IMSE#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 LT3995IMSE#TRPBF?
For technical support, including LT3995IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3995IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3995IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3995IMSE#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 LT3995IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3995IMSE#TRPBF?
All LT3995IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3995IMSE#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 LT3995IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3995IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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