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Analog Devices Inc. LT3990EMSE#TRPBF
- Part No.:
- LT3990EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,296
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Product details
Overview
LT3990EMSE#TRPBF from Analog Devices is a 62V, 350mA monolithic step-down regulator with integrated boost and catch diodes, 2.5µA quiescent current at 12VIN to 3.3VOUT, low-ripple Burst Mode operation (<5mVP-P), and programmable undervoltage lockout (1.19V threshold). It delivers regulated 5V output in MSOP-16 package and is used in automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3990EMSE#TRPBF datasheet, LT3990EMSE#TRPBF pinout, LT3990EMSE#TRPBF application, or LT3990EMSE#TRPBF equivalent, key selection criteria include input voltage range (4.2V–62V), fixed 5V output, thermal performance (θJA = 40°C/W), AEC-Q100 qualification, and integrated diode architecture eliminating external components.
Technical Context
The LT3990EMSE#TRPBF implements constant-frequency current-mode control with adjustable switching frequency (200kHz–2.2MHz) set by an external RT resistor. Its internal bipolar NPN switch is driven via a BOOST capacitor to ensure full saturation, enabling high efficiency across wide input ranges.
Burst Mode operation reduces quiescent current to 1.8µA at light loads while maintaining output ripple below 5mVP-P; the power good (PG) flag asserts when VOUT reaches 90% of regulation, and catch diode current limiting (450mA typical) provides fault protection during short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 62V - supports direct connection to 48V industrial rails and automotive batteries without pre-regulation. |
| Output Voltage | Fixed 5V ±1.2% - eliminates external feedback resistors and simplifies layout for stable 5V system rail generation. |
| Max Output Current | 350mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT - enables always-on functionality in battery-backed systems with multi-year standby life. |
| Switching Frequency | 200kHz to 2.2MHz - allows optimization of inductor size (e.g., 33µH at 400kHz) and EMI profile per application requirements. |
| Thermal Resistance | θJA = 40°C/W - enables 350mA continuous operation at ambient up to 85°C with standard PCB copper area. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial environments without derating. |
Pinout & Package
LT3990EMSE#TRPBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND). The package features FMEA fault tolerance: open or shorted adjacent pins do not cause overvoltage at VOUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pins 1,2) | Feedback reference input | Internally tied; regulates to 1.21V - redundant connection improves noise immunity and reliability in noisy environments. |
| EN/UVLO (Pin 4) | Enable / undervoltage lockout input | 1.19V threshold with 35mV hysteresis - enables precise brown-in/brown-out control and zero-current shutdown (0.7µA). |
| VIN (Pin 6) | Main power input | Supplies internal circuitry and switch - requires local 1µF ceramic bypass to minimize high-frequency ripple and EMI. |
| GND (Pins 8,17) | Power and signal ground | Exposed pad (Pin 17) must be soldered to PCB - primary thermal path and low-impedance return for switch current. |
| SW (Pin 9) | Switch node | Connects to inductor - carries pulsed current up to 700mA peak; layout must minimize loop area to reduce EMI. |
| BOOST (Pin 11) | Bootstrap drive supply | Requires external capacitor to generate >VIN voltage - ensures full saturation of internal bipolar NPN switch for low VCE(SAT). |
| BD (Pin 13) | Boost diode anode | Connects to external boost diode anode - also powers internal bias regulator when >3.2V, improving light-load efficiency. |
| PG (Pin 14) | Power good open-drain flag | Asserts high when VOUT ≥90% of target - enables sequencing and fault monitoring without additional supervisor ICs. |
| RT (Pin 16) | Frequency programming | Resistor-to-ground sets switching frequency - enables trade-off between component size (higher fSW) and efficiency (lower fSW). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates 2 external Schottky diodes - reduces BOM count, PCB area, and assembly cost in compact 5V supply designs. |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while drawing only 1.8µA - critical for noise-sensitive analog and RF subsystems. |
| FMEA fault-tolerant pinout | Output remains at or below regulation voltage during adjacent pin shorts or floating pins - meets ASIL-B functional safety requirements. |
| AEC-Q100 qualified | Rated for automotive applications (Grade 1: –40°C to +125°C) - supports deployment in engine control, ADAS, and infotainment without additional qualification. |
| Accurate programmable UVLO | 1.19V enable threshold with 35mV hysteresis - enables clean power-up sequencing and prevents erratic operation near battery depletion. |
Applications
| Automotive Battery Regulation | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Regulating raw 12V–48V vehicle battery to stable 5V for CAN transceivers and microcontrollers in engine control modules. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, low-noise 5V rail with fault protection against load dump and cold-crank transients. Use Value: Integrated diodes and 62V rating eliminate external TVS and pre-regulator stages; AEC-Q100 qualification ensures compliance with automotive reliability standards. | Use Scenario: Powering 4–20mA loop-powered sensors and precision ADCs in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Fixed-output buck regulator delivering low-ripple 5V from unregulated 24V industrial bus with minimal external components. Use Value: 2.5µA quiescent current extends battery backup duration; thermal-enhanced MSOP package sustains 350mA output at 85°C ambient. |
| Portable Medical Device Power | Smart Building Controller Rail |
Use Scenario: Generating 5V for Bluetooth LE modules and low-power MCUs in handheld diagnostic tools powered by Li-ion batteries. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating across battery discharge range (3.5V–4.2V) and maintaining regulation down to 4.2VIN. Use Value: Burst Mode efficiency preserves battery life; small MSOP-16 footprint fits tight enclosures; no external diodes reduce bill-of-materials. | Use Scenario: Providing 5V logic rail for Zigbee/Wi-Fi SoCs and environmental sensors in HVAC controllers mounted inside ductwork. IC Role / Device Role / Timing Role: Robust DC/DC converter handling wide temperature swings (–40°C to +85°C) and long-term operation on building mains-derived 24V DC. Use Value: –40°C to +125°C operation margin ensures reliability in enclosed, thermally stressed locations; PG flag enables firmware health monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMS#TRPBF | 40V max input, 300mA output, 1.2µA IQ, no integrated diodes | Requires external Schottky diodes; lower voltage rating limits use in 48V systems | Select when ultra-low IQ dominates over integration and 48V support is unnecessary. |
| TPS54302DDAR | 28V max input, 3A output, 26µA IQ, integrated MOSFETs only (no diodes) | Higher current but higher IQ and narrower VIN range; needs external catch diode | Select when >350mA load current is required and 62V input is not needed. |
Compared with LTC3630EMS#TRPBF and TPS54302DDAR, the LT3990EMSE#TRPBF uniquely combines 62V input capability, integrated diodes, sub-3µA quiescent current, and AEC-Q100 qualification - making it optimal for space- and reliability-constrained 5V automotive and industrial supplies where external diode omission is critical.
Availability
LT3990EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor power supplies, and portable medical device power requiring stable component supply with long lifecycle assurance.
Supply support for LT3990EMSE#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.
The LT3990 product line delivers high-voltage, low-quiescent-current buck regulators with integrated diodes for automotive, industrial, and portable applications demanding reliability, small size, and extended battery life.
FAQ
What is the maximum input voltage supported by the LT3990EMSE#TRPBF?
The LT3990EMSE#TRPBF supports a maximum continuous input voltage of 62V, with absolute maximum ratings of 62V on VIN and 75V on the BOOST pin. This enables direct connection to 48V industrial buses and automotive battery systems including load dump transients, provided external clamping is applied per design guidelines in the datasheet.
Does the LT3990EMSE#TRPBF require external diodes?
No, the LT3990EMSE#TRPBF integrates both the boost diode and catch diode on-die. This eliminates the need for two external Schottky diodes, reducing component count, PCB area, and potential failure points - a key differentiator versus most competing high-voltage buck regulators.
What output voltage does the LT3990EMSE#TRPBF deliver?
The LT3990EMSE#TRPBF delivers a fixed 5V output with ±1.2% accuracy over temperature and line. It belongs to the LT3990-5 variant family; unlike the adjustable LT3990 or LT3990-3.3 versions, it requires no external feedback resistors and regulates directly to 5V at the VOUT pins.
How does the LT3990EMSE#TRPBF achieve low quiescent current?
The LT3990EMSE#TRPBF achieves 2.5µA quiescent current at 12VIN→5VOUT through optimized internal biasing, low-leakage process technology, and intelligent Burst Mode operation that shuts down non-essential circuitry between switching bursts - enabling multi-year battery life in always-on applications.
Is the LT3990EMSE#TRPBF qualified for automotive applications?
Yes, the LT3990EMSE#TRPBF is AEC-Q100 qualified (Grade 1: –40°C to +125°C) and features FMEA-compliant pinout design. Its MSOP-16 package with exposed thermal pad and robust fault protection (catch diode current limit, accurate UVLO, PG flag) make it suitable for engine control, body electronics, and ADAS subsystems.
LT3990EMSE#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):
- 4.2V
- Voltage - Input (Max):
- 62V
- Voltage - Output (Min/Fixed):
- 1.21V
- Voltage - Output (Max):
- 25V
- Current - Output:
- 350mA
- Frequency - Switching:
- 210kHz ~ 2.3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3990EMSE#TRPBF FAQ
1.How can I place an order for LT3990EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990EMSE#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 LT3990EMSE#TRPBF reliable?
The price and inventory of LT3990EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3990EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3990EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990EMSE#TRPBF?
LT3990EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990EMSE#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 LT3990EMSE#TRPBF?
For technical support, including LT3990EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3990EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3990EMSE#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 LT3990EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3990EMSE#TRPBF?
All LT3990EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990EMSE#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 LT3990EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3990EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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