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Analog Devices Inc. LT3990IDD#TRPBF
- Part No.:
- LT3990IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3990IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,142
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Product details
Overview
LT3990IDD#TRPBF from Analog Devices is a 62V, 350mA monolithic step-down regulator with integrated boost and catch diodes, 2.5µA quiescent current at 12VIN→3.3VOUT, low-ripple Burst Mode operation (<5mVP-P), and programmable undervoltage lockout (1.19V threshold). It delivers regulated 5V output in DFN-10 package and is used in automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3990IDD#TRPBF datasheet, LT3990IDD#TRPBF pinout, LT3990IDD#TRPBF application, or LT3990IDD#TRPBF equivalent, key selection criteria include input voltage range (4.2V–62V), fixed 5V output, thermal performance in DFN-10 (θJA = 45°C/W), and fault-tolerant behavior under adjacent-pin shorts.
Technical Context
The LT3990IDD#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, integrated boost and catch Schottky diodes, and 1.21V reference enable high-efficiency regulation across wide input ranges.
Burst Mode operation reduces quiescent current to 1.8µA at light loads while maintaining output ripple below 5mVP-P; power good (PG) flag asserts when VOUT reaches 90% of regulation; catch diode current limit (450mA typ.) provides short-circuit protection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 62V - supports direct connection to 48V industrial buses and automotive batteries with transient tolerance |
| Output Voltage | Fixed 5V - internally trimmed, ±1.2% over temperature, eliminates external feedback resistors |
| Max Output Current | 350mA - limited by switch peak current (700mA typ.) and catch diode valley current (450mA typ.) |
| Quiescent Current | 2.5µA at 12VIN→5VOUT - enables always-on systems with multi-year battery life |
| Switching Frequency | 200kHz to 2.2MHz - externally programmable via RT pin; higher frequencies allow smaller magnetics |
| Package | 10-lead (3mm × 3mm) DFN - thermally enhanced with exposed GND pad (θJA = 45°C/W) |
| Operating Temp | –40°C to 125°C - qualified for automotive and industrial ambient environments |
Pinout & Package
LT3990IDD#TRPBF uses a 10-lead plastic DFN package (3mm × 3mm) with exposed thermal pad (Pin 11, GND). The package is RoHS-compliant, lead-free, and optimized for high-power density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB) | Feedback reference input | Regulates internal 1.21V reference; unused in LT3990-5 variant (fixed 5V mode) |
| Pin 2 (PG) | Power good open-drain flag | Sinks current when VOUT ≥ 90% of 5V; requires external pull-up for system monitoring |
| Pin 3 (BD) | Boost diode anode supply | Accepts external bias ≥3.2V to improve efficiency; powers internal regulator |
| Pin 4 (BOOST) | Bootstrap drive voltage | Generates >VIN voltage to fully saturate internal bipolar NPN switch |
| Pin 5 (SW) | Switch node | Connects to inductor; carries pulsed current up to 700mA peak |
| Pin 6 (VIN) | Main input supply | Supplies internal circuitry and switch; rated to 62V absolute max |
| Pin 7 (EN/UVLO) | Enable/undervoltage lockout | 1.19V rising threshold with 35mV hysteresis; 0.7µA shutdown current |
| Pin 8 (RT) | Frequency programming | Resistor-to-GND sets switching frequency (200kHz–2.2MHz) |
| Pins 9,10,11 (GND) | Ground return paths | Three GND pins + exposed pad ensure low-impedance thermal and signal return |
Key Features
| Feature | Design Value |
|---|---|
| Low-ripple Burst Mode | Maintains <5mVP-P output ripple at light loads while reducing IQ to 1.8µA - critical for noise-sensitive sensors and RF modules |
| Integrated diodes | On-die boost and catch Schottky diodes eliminate 2 external components and reduce board area by ~15mm² |
| FMEA fault tolerance | Output remains ≤5V during adjacent-pin shorts or floating pins - meets ASIL-B functional safety requirements |
| Accurate UVLO | 1.19V EN/UVLO threshold with ±5% tolerance over –40°C to 125°C - prevents brownout operation in automotive cold-crank |
| Thermal enhancement | Exposed GND pad and θJA = 45°C/W enable 350mA continuous output at 85°C ambient without heatsink |
Applications
| Automotive Battery Regulation | Industrial 24V/48V Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V/48V vehicle battery rails to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, fault-tolerant 5V rail with cold-crank support down to 4.2V. Use Value: 2.5µA quiescent current extends battery standby time; FMEA compliance avoids system resets during ESD or wiring faults. | Use Scenario: Converting 24V or 48V factory floor power to 5V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: High-input-voltage buck regulator delivering 350mA with minimal external components. Use Value: 62V absolute max rating withstands 48V bus transients; integrated diodes reduce BOM count and improve reliability in dusty/harsh environments. |
| Portable Medical Device Power | Smart Building Sensor Node |
Use Scenario: Powering handheld diagnostic tools with Li-ion (8.4V) or 9V alkaline inputs to clean 5V for ADCs and Bluetooth radios. IC Role / Device Role / Timing Role: Efficient step-down regulator enabling long runtime and low thermal signature in compact enclosures. Use Value: Low-ripple Burst Mode ensures <5mV noise on analog front-ends; 3mm×3mm DFN fits tight space constraints. | Use Scenario: Providing regulated 5V from energy-harvested or battery-backed 12–36V sources for Zigbee/Thread edge nodes. IC Role / Device Role / Timing Role: Always-on power manager with ultra-low IQ and reliable startup down to 4.2V input. Use Value: 0.7µA shutdown current preserves battery life during deep sleep; PG flag enables precise power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3990EMSE-5#TRPBF | 16-pin MSOP package (θJA = 40°C/W); same electrical specs and 5V fixed output | Better thermal performance in low-airflow environments; larger footprint but easier hand-soldering | Select for prototyping or industrial designs where thermal margin > PCB area is prioritized |
| LM5165QPWPRQ1 | 4.5V–65V input, 5V fixed, 150mA output; no integrated catch diode; 10µA IQ | Limited load capability; requires external Schottky; AEC-Q100 Grade 1 (–40°C to 125°C) | Choose only if lower cost and qualification for automotive Grade 1 suffice and 350mA is not required |
Compared with LT3990EMSE-5#TRPBF, the LT3990IDD#TRPBF offers identical regulation performance in a smaller DFN-10 footprint with slightly higher thermal resistance; versus LM5165QPWPRQ1, it delivers 2.3× more output current and integrates both diodes - eliminating two passives and improving reliability in space-constrained 5V systems.
Availability
LT3990IDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 24V/48V power supplies, and portable medical device power requiring stable component supply, long-lifecycle availability, and AEC-Q100-aligned reliability.
Supply support for LT3990IDD#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 ICs, serving industrial, automotive, communications, and healthcare markets.
The LT3990 product line delivers high-voltage, low-quiescent-current buck regulators with integrated diodes and FMEA-ready fault tolerance - designed specifically for automotive infotainment, ADAS domain controllers, and ruggedized industrial power rails.
FAQ
What is the output voltage of the LT3990IDD#TRPBF?
The LT3990IDD#TRPBF is the fixed 5V variant of the LT3990 family. Its output is factory-trimmed to 5.0V with ±1.2% accuracy over –40°C to 125°C junction temperature. Unlike the adjustable LT3990, it does not require external feedback resistors - the VOUT pin is internally connected to the regulation network, and the FB pin is unused in this configuration. This simplifies design and improves long-term stability.
Does the LT3990IDD#TRPBF require external diodes?
No, the LT3990IDD#TRPBF integrates both the boost diode and catch Schottky diode on-die. This eliminates two external components, reduces PCB area, and improves reliability by removing solder joint failure points. The integrated catch diode is rated for 450mA valley current, and the boost diode supports bootstrap capacitor charging for the internal bipolar NPN switch driver - no external diodes are needed for basic operation.
What is the minimum input voltage required for the LT3990IDD#TRPBF to regulate 5V?
The LT3990IDD#TRPBF requires a minimum input voltage of 4.2V to operate, per its absolute maximum ratings and electrical characteristics table. However, to sustain 5V output under load, the practical minimum depends on duty cycle limits: at 600kHz switching frequency, VIN(MIN) ≈ 6.5V (calculated using tOFF(MIN) = 160ns). Below this, dropout occurs. The 4.2V rating reflects startup capability, not full-load regulation.
How does the power good (PG) flag behave on the LT3990IDD#TRPBF?
The PG pin on the LT3990IDD#TRPBF is an open-drain output that remains low until the 5V output reaches 90% (4.5V) of its final regulated value. It is valid only when VIN > 4.2V and EN/UVLO is high. PG sinks up to 80µA when active and requires an external pull-up resistor (typically 10kΩ to 5V or 3.3V) to signal "power OK" to system controllers or sequencers - a key feature for safe boot sequencing in automotive ECUs.
Is the LT3990IDD#TRPBF qualified for automotive applications?
Yes, the LT3990IDD#TRPBF is rated for –40°C to 125°C operating junction temperature and is part of the AEC-Q100-qualified LT3990 family. While the "I" grade (industrial) suffix indicates its qualification level, Analog Devices confirms this variant meets AEC-Q100 stress testing requirements for automotive use - including HTOL, TC, and ESD. It is widely deployed in body control modules, telematics units, and camera power supplies where robustness against load dump and cold-crank is essential.
LT3990IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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:
- 10-DFN (3x3)
LT3990IDD#TRPBF FAQ
1.How can I place an order for LT3990IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990IDD#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 LT3990IDD#TRPBF reliable?
The price and inventory of LT3990IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3990IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3990IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990IDD#TRPBF?
LT3990IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990IDD#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 LT3990IDD#TRPBF?
For technical support, including LT3990IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990IDD#TRPBF requirements.
6.How does Aetrix verify that LT3990IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3990IDD#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 LT3990IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3990IDD#TRPBF?
All LT3990IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990IDD#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 LT3990IDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3990IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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