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Analog Devices Inc. LT3990IMSE-5#PBF
- Part No.:
- LT3990IMSE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990IMSE-5#PBF.pdf
- Description:
- IC REG BUCK 5V 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,330
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Product details
Overview
LT3990IMSE-5#PBF from Analog Devices is a 62V input, 350mA fixed-output buck regulator with integrated boost and catch diodes, 2.5µA quiescent current at 12VIN→5VOUT, low-ripple Burst Mode operation (<5mVP-P), and power good flag. It delivers regulated 5V output in automotive battery regulation and industrial power supply applications.
For engineers reviewing the LT3990IMSE-5#PBF datasheet, LT3990IMSE-5#PBF pinout, LT3990IMSE-5#PBF application, or LT3990IMSE-5#PBF equivalent, key selection criteria include its 5V fixed output, 16-pin MSOP thermal performance (θJA = 40°C/W), AEC-Q100 qualification, and FMEA fault-tolerant pin behavior during adjacent short or floating conditions.
Technical Context
The LT3990IMSE-5#PBF implements constant-frequency current-mode control with programmable switching frequency (200kHz–2.2MHz) via RT resistor. Its internal bipolar NPN switch and integrated Schottky diodes enable high-efficiency step-down conversion without external diodes.
It features dual current limiting-switch peak limit (700mA typ) and catch diode valley limit (450mA typ)-plus accurate undervoltage lockout (1.19V threshold, 35mV hysteresis) and power good monitoring (90% VOUT trip point). The device operates across –40°C to 125°C junction temperature and supports hot-plug-safe startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2%, tightly regulated for stable microcontroller or sensor rail |
| Input Voltage Range | 4.2V to 62V - supports wide-range industrial and automotive battery inputs |
| Quiescent Current | 2.5µA at 12VIN→5VOUT - enables always-on systems with multi-year battery life |
| Switching Frequency | 200kHz–2.2MHz, set by RT resistor - allows optimization of inductor size vs. efficiency |
| Output Current | 350mA continuous - sufficient for powering small processors, sensors, or interface ICs |
| Package Thermal Resistance | θJA = 40°C/W (MSOP) - enables reliable operation at full load without forced air |
| Power Good Flag | Open-drain PG asserts when VOUT reaches 90% of 5V - provides system-level power sequencing signal |
Pinout & Package
LT3990IMSE-5#PBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND), rated for –40°C to 125°C operation. Pin count, layout, and thermal design support high-density PCB integration in space-constrained automotive and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/VOUT (Pins 1,2) | Fixed-output feedback node | Internally connected to 5V regulation reference; redundant pins improve layout robustness and noise immunity |
| EN/UVLO (Pin 4) | Enable and undervoltage lockout input | Active-high enable with 1.19V threshold and 35mV hysteresis; disables regulator below 4.2V VIN |
| VIN (Pin 6) | Main power input | Supplies internal circuitry and switch; requires local ceramic bypass (≥1µF X7R) |
| GND (Pins 8,17) | Ground reference and thermal path | Exposed pad (Pin 17) must be soldered to PCB copper for thermal and electrical integrity |
| SW (Pin 9) | Switch node | Connects to inductor; carries high di/dt switching current - requires tight loop layout |
| BOOST (Pin 11) | Bootstrap drive voltage source | Drives internal NPN switch base above VIN; requires external 0.22µF ceramic capacitor to SW |
| BD (Pin 13) | Boost diode anode connection | Provides bias power to internal regulator when >3.2V; improves light-load efficiency |
| PG (Pin 14) | Power good open-drain output | Sinks current when VOUT < 4.5V; requires external pull-up for system reset or sequencing |
| RT (Pin 16) | Frequency programming input | Resistor to GND sets switching frequency; 374kΩ yields 400kHz per typical application |
Key Features
| Feature | Design Value |
|---|---|
| Low-ripple Burst Mode | Maintains <5mVP-P output ripple at light loads while reducing IQ to 1.8µA - eliminates need for post-regulation LDO in low-power systems |
| FMEA Fault Tolerance | Output remains at or below regulation voltage during adjacent pin shorts or floating NC pins - meets ASIL-B functional safety requirements |
| Integrated Diodes | On-die boost and catch Schottky diodes eliminate 2 external components and reduce board area by ~12mm² |
| AEC-Q100 Qualified | Rated for automotive applications (Grade I, –40°C to 125°C) with full reliability testing - suitable for under-hood and infotainment power rails |
| Accurate UVLO | Programmable 1.19V EN/UVLO threshold with 35mV hysteresis - prevents brownout oscillation during battery sag |
Applications
| Automotive Battery Regulation | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to clean 5V rail for CAN transceivers and microcontrollers in ADAS ECUs. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, fault-tolerant 5V supply with power sequencing via PG flag. Use Value: AEC-Q100 qualification and FMEA behavior ensure compliance with ISO 26262 ASIL-B requirements without additional safety circuitry. | Use Scenario: Powering 4–20mA loop-powered sensors and analog front-ends in factory automation PLC modules. IC Role / Device Role / Timing Role: Fixed-output buck regulator delivering stable 5V from wide-input industrial supplies (18–60V DC). Use Value: 62V max input and 2.5µA quiescent current enable direct connection to unregulated field wiring with minimal standby loss. |
| Portable Medical Device Power | Smart Building Controller Rail |
Use Scenario: Generating 5V from dual-cell Li-ion (6–8.4V) or 9V alkaline batteries in handheld diagnostic tools. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with ultra-low IQ extending battery life in intermittent-use devices. Use Value: Burst Mode operation maintains <5mV ripple and 2.5µA IQ - eliminates audible noise and enables >3-year shelf life on primary cells. | Use Scenario: Providing 5V logic rail for Zigbee/BLE SoCs and environmental sensors in battery-backed smart thermostats. IC Role / Device Role / Timing Role: Always-on power management IC with PG flag enabling precise wake-up and brownout detection. Use Value: 0.7µA shutdown current and accurate UVLO prevent deep discharge of backup coin cells during mains failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3990EMSE-5#PBF | Same electrical specs and pinout; rated for –40°C to 125°C (E-grade vs. I-grade) | Lower temperature guarantee; not qualified for extended automotive ambient conditions | Select when full I-grade reliability is unnecessary and cost sensitivity is higher |
| LT3990HMSE-5#PBF | Same electrical specs and pinout; rated for –40°C to 150°C (H-grade) | Higher junction temperature rating for under-hood or high-ambient industrial use | Select when operating junction temperature exceeds 125°C or AEC-Q100 H-grade validation required |
Compared with LT3990EMSE-5#PBF, the LT3990IMSE-5#PBF offers guaranteed performance over the full –40°C to 125°C range and automotive qualification, while LT3990HMSE-5#PBF extends thermal capability to 150°C - making the I-grade optimal for cost-sensitive automotive modules requiring full temperature coverage.
Availability
LT3990IMSE-5#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor power supplies, portable medical devices, and smart building controller rails requiring stable component supply and long-term lifecycle support.
Supply support for LT3990IMSE-5#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) designs precision analog, mixed-signal, and power management ICs for high-reliability applications.
The LT3990 product line delivers high-voltage, low-quiescent-current buck regulators with integrated diodes and FMEA-compliant behavior - engineered specifically for automotive, industrial, and portable systems demanding robustness and long service life.
FAQ
What is the output voltage tolerance of the LT3990IMSE-5#PBF?
The LT3990IMSE-5#PBF provides a fixed 5V output with guaranteed tolerance of ±1.2% over the full –40°C to 125°C operating junction temperature range. This specification is verified per Electrical Characteristics table (VOUT MIN/MAX = 4.94V/5.06V at 25°C; 4.90V/5.10V over full temp range), ensuring compatibility with 5V-tolerant microcontrollers and interface ICs without external trimming.
Does the LT3990IMSE-5#PBF require external diodes?
No, the LT3990IMSE-5#PBF integrates both the boost diode and catch Schottky diode on-die. This eliminates two external components, reduces PCB area, and removes associated layout sensitivity - confirmed in the Features list ("Integrated Boost and Catch Diodes") and Block Diagram. External diodes are neither recommended nor required for standard operation.
What is the minimum input voltage required for the LT3990IMSE-5#PBF to regulate 5V output?
The LT3990IMSE-5#PBF requires a minimum input voltage of 4.2V to operate, as specified in Absolute Maximum Ratings and Electrical Characteristics. However, to sustain 5V output under load, the practical minimum depends on duty cycle limits: at 400kHz switching frequency, VIN(MIN) ≈ 6.5V (per Typical Performance Figure 20). Below this, dropout occurs due to finite minimum on-time.
How does the power good (PG) flag behave on the LT3990IMSE-5#PBF?
The PG pin on the LT3990IMSE-5#PBF is an open-drain output that remains low until the FB/VOUT pin reaches 90% of 5V (i.e., 4.5V), then transitions high via external pull-up. It is valid only when VIN > 4.2V and EN/UVLO is high. This behavior is documented in the Pin Functions section and Electrical Characteristics (PG Threshold Offset = 6.5–13.5% of VOUT).
Is the LT3990IMSE-5#PBF pin-compatible with other LT3990 variants?
Yes, the LT3990IMSE-5#PBF shares identical pinout, footprint, and electrical interface with all LT3990-X MSE-package variants (e.g., LT3990IMSE#PBF, LT3990IMSE-3.3#PBF), including shared FB/VOUT pins, EN/UVLO, SW, BOOST, BD, PG, and RT assignments. This allows drop-in replacement within the same package family when adjusting output voltage or grade.
LT3990IMSE-5#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):
- 5V
- 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
LT3990IMSE-5#PBF FAQ
1.How can I place an order for LT3990IMSE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990IMSE-5#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 LT3990IMSE-5#PBF reliable?
The price and inventory of LT3990IMSE-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3990IMSE-5#PBF is usually 5 days.
3.What payment methods are accepted for LT3990IMSE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990IMSE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990IMSE-5#PBF?
LT3990IMSE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990IMSE-5#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 LT3990IMSE-5#PBF?
For technical support, including LT3990IMSE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990IMSE-5#PBF requirements.
6.How does Aetrix verify that LT3990IMSE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3990IMSE-5#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 LT3990IMSE-5#PBF meets industry standards.
7.What is the process for return or replacement of LT3990IMSE-5#PBF?
All LT3990IMSE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990IMSE-5#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 LT3990IMSE-5#PBF part is unused and in its original packaging.
Return procedure for LT3990IMSE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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