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Analog Devices Inc. LT3990EMSE-3.3#PBF
- Part No.:
- LT3990EMSE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990EMSE-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,003
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Product details
Overview
LT3990EMSE-3.3#PBF from Analog Devices is a 62V input, 350mA fixed-output 3.3V monolithic buck regulator with integrated boost and catch diodes, 2.5µA quiescent current at 12VIN, low-ripple Burst Mode operation (<5mVP-P), and power good flag. It serves as a primary DC/DC step-down stage in automotive battery-supplied systems requiring high input voltage tolerance and ultra-low standby power.
For engineers reviewing the LT3990EMSE-3.3#PBF datasheet, LT3990EMSE-3.3#PBF pinout, LT3990EMSE-3.3#PBF application, or LT3990EMSE-3.3#PBF equivalent, key selection criteria include its 3.3V fixed output, 16-pin MSOP thermal performance (θJA = 40°C/W), AEC-Q100 qualification, programmable UVLO, and integrated diode architecture eliminating external Schottky requirements.
Technical Context
The LT3990EMSE-3.3#PBF implements constant-frequency current-mode control with adjustable switching frequency (200kHz–2.2MHz) set via RT-to-ground resistor. Its internal bipolar NPN switch is driven by a bootstrap circuit referenced to the BOOST pin, enabling full saturation across wide input ranges up to 62V.
Fault protection includes catch diode current limiting (450mA typical), accurate undervoltage lockout (1.19V threshold, 35mV hysteresis), and FMEA-tolerant MSOP packaging where adjacent pin shorts or floating NC pins do not cause overvoltage at VOUT. Power good (PG) asserts when FB reaches 90% of regulation, valid only when VIN > 4.2V and EN/UVLO is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.2% over –40°C to 125°C; eliminates external feedback resistors and associated layout sensitivity. |
| Input Voltage Range | 4.2V to 62V operating; supports direct connection to 12V/24V/48V automotive and industrial rails without pre-regulation. |
| Quiescent Current | 2.5µA at 12VIN → 3.3VOUT; enables >10-year battery life in always-on telematics or sensor nodes. |
| Switching Frequency | Programmable 200kHz–2.2MHz via RT pin; allows optimization of inductor size (e.g., 33µH @ 400kHz) vs. efficiency trade-offs. |
| Output Current | 350mA continuous; limited by both switch peak current (700mA typ.) and catch diode valley current (450mA typ.). |
| Package | 16-lead plastic MSOP with exposed thermal pad; θJA = 40°C/W enables 1.5W dissipation at 125°C ambient without heatsink. |
| Power Good Flag | Open-drain PG output signals VOUT ≥ 90% of 3.3V; provides system-level power sequencing and fault detection. |
Pinout & Package
LT3990EMSE-3.3#PBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND). The package supports high-power density designs with low thermal resistance (θJA = 40°C/W) and requires soldering of the exposed pad to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 & 2 (VOUT) | Fixed-output voltage reference node | Internally connected to precision 3.3V regulator; redundant pins reduce trace impedance and improve noise immunity. |
| Pin 4 (EN/UVLO) | Enable and undervoltage lockout input | Active-high enable with 1.19V threshold and 35mV hysteresis; ties directly to VIN if shutdown not required. |
| Pin 6 (VIN) | Main power input | Supplies internal bias and switch driver; must be locally bypassed with ≥1µF X7R ceramic capacitor. |
| Pin 8, 17 (GND) | Power and signal ground | Exposed pad (Pin 17) is GND and mandatory for thermal conduction; multiple GND pins minimize ground bounce. |
| Pin 9 (SW) | Switch node | Connects to inductor; carries high di/dt switching current; requires short, low-inductance PCB routing. |
| Pin 11 (BOOST) | Bootstrap drive supply | Provides >VIN voltage to fully saturate internal NPN switch; requires external 0.22µF ceramic capacitor to SW. |
| Pin 13 (BD) | Boost diode anode | Connects to external boost diode anode; supplies bias current to internal regulator when BD > 3.2V, improving light-load efficiency. |
| Pin 14 (PG) | Power good open-drain output | Sinks current when VOUT < 2.97V; requires external pull-up to monitor system power health. |
| Pin 16 (RT) | Frequency setting | Resistor from RT to GND sets switching frequency; 374kΩ yields 400kHz per datasheet Table 1. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates 2 external Schottky diodes, reducing BOM count, board area, and forward voltage losses in compact layouts. |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while achieving 2.5µA IQ, critical for battery-backed systems. |
| FMEA-tolerant MSOP packaging | Guarantees VOUT stays at or below 3.3V during adjacent pin shorts or floating NC pins-required for ASIL-B automotive compliance. |
| AEC-Q100 qualified (Grade E) | Validated for –40°C to +125°C operation with extended reliability testing; suitable for under-hood and infotainment applications. |
| Accurate programmable UVLO | 1.19V enable threshold with 35mV hysteresis enables precise brown-out recovery and prevents cycling near minimum input voltage. |
Applications
| Automotive Battery Regulation | Industrial Sensor Node Power |
|---|---|
Use Scenario: Regulating 12V–48V vehicle battery rail to stable 3.3V for CAN transceivers and microcontrollers in ADAS ECUs. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, low-noise 3.3V domain with fast transient response to load steps from CAN bus activity. Use Value: 62V input rating withstands load dump transients; 2.5µA quiescent current extends battery life during sleep mode; AEC-Q100 qualification ensures field reliability. | Use Scenario: Powering wireless IoT sensors in factory automation systems with 24V DC distribution buses. IC Role / Device Role / Timing Role: Standby-optimized DC/DC converter delivering regulated 3.3V to ultra-low-power MCUs and RF modules during periodic wake cycles. Use Value: Low-ripple Burst Mode maintains <5mV ripple during 10µA–100mA load transitions; integrated diodes simplify layout in space-constrained DIN-rail enclosures. |
| Portable Medical Device Supply | Ruggedized Telematics Module |
Use Scenario: Converting dual-cell Li-ion (6V–8.4V) or 9V alkaline to clean 3.3V for patient monitoring ASICs and Bluetooth LE radios. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with tight output tolerance ensuring ADC reference stability and RF transmit consistency. Use Value: 3.3V fixed output eliminates resistor divider drift; 40°C/W thermal resistance enables passive cooling in sealed handheld housings. | Use Scenario: Providing robust 3.3V power to GPS/GNSS receivers and cellular modems in fleet tracking units exposed to wide temperature swings. IC Role / Device Role / Timing Role: Fault-resilient power stage maintaining regulation during cold-crank (4.2V) and load-dump (62V) events per ISO 16750-2. Use Value: Catch diode current limit protects against shorted outputs; PG flag enables firmware-controlled power sequencing and diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMS8E-3.3#PBF | 40V max input, 150mA output, no integrated catch diode, requires external Schottky. | Lower power, lower voltage systems; lacks 62V capability and integrated diodes. | Select when cost-sensitive, low-current (<150mA) designs prioritize smaller 8-lead MSOP footprint over input range. |
| MPQ4420AGL-AEC1-Z | 60V max input, 2A output, synchronous rectification, no integrated boost diode, requires external bootstrap cap. | Higher current, higher efficiency needs; lacks FMEA-tolerant pinout and AEC-Q100 Grade E validation. | Select when >350mA load current or >95% efficiency at full load is required, accepting larger solution size and additional external components. |
Compared with LTC3631EMS8E-3.3#PBF, LT3990EMSE-3.3#PBF delivers 2.3× higher output current and full 62V input support with integrated diodes; versus MPQ4420AGL-AEC1-Z, it offers superior fault tolerance and automotive qualification but trades off peak current capability for ultra-low IQ and simplified bill-of-materials.
Availability
LT3990EMSE-3.3#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor node power, portable medical device supply, and ruggedized telematics modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3990EMSE-3.3#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3990 product line delivers high-voltage, low-quiescent-current buck regulators with integrated power devices for harsh-environment applications where reliability, small size, and wide input range are critical design constraints.
FAQ
What is the maximum input voltage rating for LT3990EMSE-3.3#PBF?
The absolute maximum input voltage for LT3990EMSE-3.3#PBF is 62V on the VIN pin and 75V on the BOOST pin. Operation above 62V on VIN is not recommended, as it exceeds the specified operating range and may compromise long-term reliability. Transient overvoltage events up to the absolute maximum ratings are tolerated, but sustained operation beyond 62V violates the datasheet specifications and voids AEC-Q100 qualification guarantees for LT3990EMSE-3.3#PBF.
Does LT3990EMSE-3.3#PBF require external diodes?
No, LT3990EMSE-3.3#PBF integrates both the boost diode and catch diode on-die, eliminating the need for external Schottky diodes. This integration reduces component count, PCB area, and forward voltage losses. The internal catch diode is rated for 450mA valley current, and the boost diode supports the internal switch drive; no external diodes are required in standard applications using LT3990EMSE-3.3#PBF.
What is the purpose of the BD pin on LT3990EMSE-3.3#PBF?
On LT3990EMSE-3.3#PBF, the BD (Boost Diode) pin connects to the anode of the external boost diode and also supplies bias current to the internal regulator when BD voltage exceeds 3.2V. When powered from the regulated 3.3V output, this feature improves light-load efficiency by reducing reliance on VIN for internal circuitry. BD must be connected to the boost diode anode; leaving it unconnected disables this efficiency enhancement but does not prevent basic operation of LT3990EMSE-3.3#PBF.
How is the switching frequency set for LT3990EMSE-3.3#PBF?
The switching frequency of LT3990EMSE-3.3#PBF is set by connecting a resistor between the RT pin (Pin 16) and GND. For example, a 374kΩ resistor yields 400kHz per the datasheet's Table 1. The supported range is 200kHz to 2.2MHz. Values outside this range result in undefined frequency behavior. RT resistor tolerance directly affects frequency accuracy; 1% metal-film resistors are recommended for stable operation of LT3990EMSE-3.3#PBF.
Is LT3990EMSE-3.3#PBF pin-compatible with other variants in the LT3990 family?
Yes, LT3990EMSE-3.3#PBF shares identical pinout and package (16-lead MSOP) with LT3990EMSE#PBF, LT3990EMSE-5#PBF, and all temperature-grade variants (I/H grades) in the EMSE suffix family. Pin functions-including dual VOUT pins (1 & 2), NC pins (3, 5, 7, 10, 12, 15), and PG/BOOST/SW assignments-are identical. This allows drop-in replacement between fixed 3.3V, fixed 5V, and adjustable versions without PCB redesign when using LT3990EMSE-3.3#PBF.
LT3990EMSE-3.3#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 62V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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-3.3#PBF FAQ
1.How can I place an order for LT3990EMSE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990EMSE-3.3#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 LT3990EMSE-3.3#PBF reliable?
The price and inventory of LT3990EMSE-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3990EMSE-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT3990EMSE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990EMSE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990EMSE-3.3#PBF?
LT3990EMSE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990EMSE-3.3#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 LT3990EMSE-3.3#PBF?
For technical support, including LT3990EMSE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990EMSE-3.3#PBF requirements.
6.How does Aetrix verify that LT3990EMSE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT3990EMSE-3.3#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 LT3990EMSE-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT3990EMSE-3.3#PBF?
All LT3990EMSE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990EMSE-3.3#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 LT3990EMSE-3.3#PBF part is unused and in its original packaging.
Return procedure for LT3990EMSE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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