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Analog Devices Inc. LT3995HMSE#PBF
- Part No.:
- LT3995HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3995HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:441
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Product details
Overview
LT3995HMSE#PBF from Analog Devices is a 60V, 3A, 2MHz monolithic step-down switching regulator with 2.7µA quiescent current, internal 85mΩ NPN switch, and 500mV dropout voltage. It features adjustable frequency (200kHz–2MHz), Burst Mode® operation (<15mV ripple), power good flag, soft-start, and AEC-Q100 H-grade qualification for automotive cold-crank battery regulation.
For engineers reviewing the LT3995HMSE#PBF datasheet, LT3995HMSE#PBF pinout, LT3995HMSE#PBF application, or LT3995HMSE#PBF equivalent, key selection considerations include ultralow IQ at no load, thermal performance up to 150°C junction, dropout behavior under VIN < VOUT, and synchronization capability across 250kHz–2MHz.
Technical Context
The LT3995HMSE#PBF uses a current-mode architecture with internal compensation, enabling fast transient response and stable loop behavior across wide input (4.3V–60V) and output (adjustable down to ~1.2V) ranges. Its bipolar NPN switch is driven by an integrated boost charge pump, requiring external BOOST capacitor to sustain saturation during high-duty-cycle or dropout conditions.
It implements dual-stage light-load optimization: low-ripple Burst Mode® (IQ = 2.7µA, VOUT ripple <15mVP-P) when SYNC is grounded, and pulse-skipping mode (IQ ≈ 11µA) when synchronized externally. Frequency foldback below 200kHz occurs during startup or overload to limit inrush and maintain control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.3V to 60V - supports automotive battery transients including cold-crank (down to 4.3V) and load-dump immunity. |
| Output Current | Up to 3A continuous - limited by thermal design; current foldback reduces peak limit to 3.1A 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 - programmable via RT resistor; synchronizable externally from 250kHz to 2MHz. |
| Dropout Voltage | 500mV - enforced minimum (VIN – VOUT) ensures boost capacitor remains charged and switch stays saturated during dropout. |
| Feedback Reference | 1.197V ±1.2% - enables precise output programming; line regulation <0.01%/V improves stability across input range. |
| Junction Temp Range | –40°C to +150°C - H-grade qualification meets AEC-Q100 Grade 0 requirements for under-hood applications. |
Pinout & Package
LT3995HMSE#PBF is housed in a thermally enhanced 16-lead MSOP package with exposed GND pad (Pin 17), 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 | Regulated to 1.197V; connects to resistor divider tap for output voltage setting and phase compensation. |
| SS (2) | Soft-start control | Internal 1.8µA pull-up ramps current limit; capacitor to GND controls inrush; actively discharged during shutdown. |
| OUT (3) | Boost diode anode / dropout sense | Connects to output node ≤16V; supplies bias when VOUT > 3.2V; enables dropout comparator (500mV threshold). |
| BOOST (4) | Charge pump drive | Drives external capacitor to generate voltage > VIN for full NPN switch saturation; max 75V rating. |
| SW (5,6,7) | Power switch output | Three paralleled pins connect to inductor, catch diode, and BOOST capacitor; handles full 3A peak current. |
| NC (8,9) | No connect | Not bonded internally; must remain unconnected per datasheet. |
| VIN (10,11,12) | Main power input | Supplies internal circuitry and switch; requires local ceramic bypass (≥1µF); rated to 60V absolute max. |
| EN (13) | Enable with UVLO | Hysteretic threshold (1.02V fall / 1.08V rise); accurate undervoltage lockout; draws only 700nA in shutdown. |
| RT (14) | Frequency set | Resistor to GND programs switching frequency from 200kHz to 2MHz; tolerance affects accuracy ±10%. |
| PG (15) | Power good flag | Open-drain output asserts high when VOUT reaches 91.6% of target; valid only when VIN > 2V. |
| SYNC (16) | External clock input | Accepts TTL/CMOS clock 250kHz–2MHz; grounding enables Burst Mode; floating prohibited. |
| GND (17) | Ground reference | Exposed thermal pad; must be soldered to PCB plane for thermal conduction and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.7µA IQ enables multi-year operation from coin cells or automotive standby batteries without recharge. |
| Burst Mode® operation | Maintains <15mVP-P output ripple at light loads while preserving >85% efficiency down to 100µA output current. |
| Thermally robust H-grade | Guaranteed operation to +150°C junction temperature supports placement near engines or powertrain ECUs. |
| Integrated boost Schottky | On-die 800mV VF Schottky eliminates external diode, reducing BOM count and PCB area in compact designs. |
| Current limit foldback | Reduces switch current limit from 6.3A to 3.1A during overload, limiting power dissipation and preventing thermal runaway. |
| Accurate programmable UVLO | EN pin threshold (1.02V/1.08V) allows precise system-level brownout detection without external comparators. |
Applications
| Automotive Battery Regulation | Industrial Power Supply |
|---|---|
|
Use Scenario: Regulating 12V/24V/48V vehicle battery to 3.3V/5V for always-on ADAS camera modules during engine-off periods. IC Role / Device Role / Timing Role: Primary buck converter providing stable, low-noise, ultralow-IQ power under cold-crank (4.3V) and load-dump (60V) conditions. Use Value: Enables >10-year battery backup life and reliable start-up after extended parking; H-grade ensures operation at under-hood temperatures up to 150°C. |
Use Scenario: Powering isolated microcontrollers and analog front-ends in factory automation I/O modules with wide-input industrial rails. IC Role / Device Role / Timing Role: Main DC-DC stage converting 18–60V field bus to 3.3V logic supply with high PSRR and low EMI due to fixed-frequency PWM/Burst Mode hybrid operation. Use Value: Eliminates need for external UVLO or thermal monitoring circuits; 500mV dropout maintains regulation during brownouts common in long cable runs. |
| Portable Medical Instrumentation | Avionics Sensor Interface |
|
Use Scenario: Powering low-power ECG or pulse oximeter subsystems from single Li-ion or two AA cells with minimal self-discharge impact. IC Role / Device Role / Timing Role: Efficient step-down regulator delivering 3.3V at up to 3A peak for intermittent sensor bursts while drawing only 2.7µA between measurements. Use Value: Extends battery runtime beyond 5 years in implantable-adjacent devices; soft-start prevents inrush-induced reset of connected MCU. |
Use Scenario: Supplying precision ADCs and MEMS inertial sensors in UAV flight controllers where EMI and thermal reliability are critical. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source synchronized to system clock to avoid beat frequencies in sensitive analog signal chains. Use Value: SYNC pin enables deterministic timing alignment; 15mV ripple meets MIL-STD-461E conducted emission limits without added filtering. |
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, no SYNC, no PG, same MSOP-16 package. | Lacks synchronization, power good flag, and 60V rating; unsuitable for automotive cold-crank or noise-sensitive sync-critical systems. | Choose LTC3639EMSE#PBF only for cost-sensitive 40V industrial apps where sync and PG are unnecessary. |
| MPQ4420AGL-A-Z | 60V input, 2A output, 20µA IQ, no Burst Mode, no PG, QFN-10 package, no exposed pad. | Higher IQ degrades battery life; lacks soft-start, PG, and thermal pad - limits use in automotive or high-reliability contexts. | MPQ4420AGL-A-Z fits space-constrained non-automotive apps but cannot replace LT3995HMSE#PBF in AEC-Q100 or ultralow-IQ designs. |
Compared with LTC3639EMSE#PBF and MPQ4420AGL-A-Z, LT3995HMSE#PBF uniquely delivers 60V/3A/2.7µA operation with PG, SYNC, and H-grade thermal rating - making it the only qualified option for automotive cold-crank and long-life portable systems requiring all four attributes.
Availability
LT3995HMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, portable medical instrumentation, and avionics sensor interface applications requiring stable component supply across extended temperature and lifetime requirements.
Supply support for LT3995HMSE#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving automotive, industrial, communications, and healthcare markets.
The LT3995 product line was designed specifically for ultralow-quiescent-current, high-voltage buck conversion in automotive and battery-powered systems - emphasizing cold-crank resilience, thermal robustness, and EMI-controlled light-load operation.
FAQ
What is the maximum junction temperature specification for LT3995HMSE#PBF?
The LT3995HMSE#PBF is guaranteed over the full operating junction temperature range of –40°C to +150°C, meeting AEC-Q100 Grade 0 requirements. This H-grade rating enables direct placement in high-temperature automotive locations such as engine control units or transmission modules, where ambient temperatures exceed 125°C.
How does LT3995HMSE#PBF achieve 2.7µA quiescent current in regulation?
The LT3995HMSE#PBF achieves 2.7µA IQ through low-ripple Burst Mode® operation: it delivers discrete current pulses to the output capacitor, then enters deep sleep (consuming only 1.7µA), minimizing average supply current. This behavior is active only when the SYNC pin is grounded - external synchronization increases IQ to ~11µA.
Can LT3995HMSE#PBF operate with input voltage below the programmed output voltage?
Yes. When VIN drops below VOUT, the LT3995HMSE#PBF enters dropout mode and regulates VOUT to VIN – 500mV, maintaining output stability during automotive cold-crank events. This is enabled by the internal dropout comparator and sustained boost capacitor voltage, ensuring the NPN switch remains saturated even at 4.3V input.
What is the function of the OUT pin on LT3995HMSE#PBF?
The OUT pin on LT3995HMSE#PBF serves three roles: (1) it connects to the anode of the internal boost Schottky diode, (2) it feeds the internal bias regulator when VOUT > 3.2V (improving efficiency), and (3) it provides the sense input for the dropout comparator that enforces the 500mV minimum (VIN – VOUT) difference.
Is LT3995HMSE#PBF pin-compatible with other grades like LT3995EMSE#PBF?
Yes. LT3995HMSE#PBF shares identical pinout, footprint, and electrical functionality with LT3995EMSE#PBF and LT3995IMSE#PBF - all use the same 16-lead MSOP package with exposed pad. The only difference is the guaranteed junction temperature range: H-grade extends to +150°C, while E/I grades are rated to +125°C.
LT3995HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3995HMSE#PBF FAQ
1.How can I place an order for LT3995HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3995HMSE#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 LT3995HMSE#PBF reliable?
The price and inventory of LT3995HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3995HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3995HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3995HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3995HMSE#PBF?
LT3995HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3995HMSE#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 LT3995HMSE#PBF?
For technical support, including LT3995HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3995HMSE#PBF requirements.
6.How does Aetrix verify that LT3995HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3995HMSE#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 LT3995HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3995HMSE#PBF?
All LT3995HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3995HMSE#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 LT3995HMSE#PBF part is unused and in its original packaging.
Return procedure for LT3995HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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