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Analog Devices Inc. LT3990EDD#TRPBF
- Part No.:
- LT3990EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3990EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,661
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Product details
Overview
LT3990EDD#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 power in automotive battery systems, industrial supplies, and portable electronics where wide input range and ultra-low IQ are critical.
For engineers reviewing the LT3990EDD#TRPBF datasheet, LT3990EDD#TRPBF pinout, LT3990EDD#TRPBF application, or LT3990EDD#TRPBF equivalent, key selection criteria include its 10-lead DFN (3mm × 3mm) thermal performance (θJA = 45°C/W), fixed 5V output variant, 0.7µA shutdown current, and FMEA-tolerant design for adjacent-pin fault resilience.
Technical Context
The LT3990EDD#TRPBF implements constant-frequency current-mode control with internal bipolar NPN switch, integrated Schottky boost and catch diodes, and an error amplifier servoing the VC node via FB feedback. Its oscillator frequency is resistor-programmable from 200kHz to 2.2MHz using the RT pin.
Burst Mode operation reduces quiescent current to 1.8µA at light loads while maintaining <5mVP-P output ripple; the power good (PG) flag asserts when VFB reaches 90% of regulation, and catch diode current limiting (450mA typical) protects against shorted outputs under high-VIN 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 Current | 350mA - maximum continuous load capability with thermal derating per θJA = 45°C/W in DFN package. |
| Quiescent Current | 2.5µA at 12VIN/3.3VOUT - enables >10-year battery life in always-on sensor nodes. |
| Switching Frequency | 200kHz–2.2MHz - adjustable via RT-to-GND resistor; higher frequencies allow smaller magnetics (e.g., 33µH at 400kHz). |
| Output Ripple | <5mVP-P in Burst Mode - meets noise-sensitive analog supply requirements without additional LDO post-regulation. |
| Shutdown Current | 0.7µA - ensures minimal drain during system sleep states. |
| Feedback Voltage | 1.21V ±1.25% - sets precision output regulation; used with external divider for adjustable versions or internal for fixed 5V (LT3990-5). |
Pinout & Package
LT3990EDD#TRPBF uses a 10-lead (3mm × 3mm) plastic DFN package with exposed thermal pad (Pin 11) soldered to PCB ground for optimal thermal performance (θJA = 45°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB) | Feedback reference input | Regulated to 1.21V; connects to resistor divider tap for output voltage setting (not used in fixed 5V variant). |
| Pin 2 (PG) | Power good open-drain flag | Asserts high (via external pull-up) when VOUT reaches 90% of target; valid only if VIN > 4.2V and EN/UVLO high. |
| Pin 3 (BD) | Boost diode anode | Connects to external boost diode anode; also powers internal bias regulator when >3.2V (e.g., tied to VOUT for efficiency gain). |
| Pin 4 (BOOST) | Bootstrap drive voltage | Supplies elevated gate drive to internal bipolar NPN switch; requires external capacitor to generate ~VIN + 5V. |
| Pin 5 (SW) | Switch node | Internal power switch output; connects directly to inductor; carries high di/dt switching current. |
| Pin 6 (FB/VOUT) | Feedback or fixed-output sense | In LT3990-5 variants like LT3990EDD#TRPBF, this pin is internally connected to the 5V regulation node (VOUT), not FB. |
| Pin 7 (EN/UVLO) | Enable and undervoltage lockout | Active-high enable with 1.19V rising threshold and 35mV hysteresis; disables regulator below 4.2V VIN unless grounded. |
| Pin 8 (VIN) | Main power input | Supplies internal circuitry and switch; must be locally bypassed with ≥1µF X7R ceramic capacitor. |
| Pins 9, 10, 11 (GND) | Ground return paths | Three GND terminals including exposed thermal pad (Pin 11); all must connect to low-impedance PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diodes | Eliminates need for two external diodes (boost and catch), reducing BOM count and layout area by ~30%. |
| FMEA-tolerant pinout | NC pins (3,5,7,10) and redundant FB/VOUT pins ensure safe operation during adjacent-pin shorts or floating pins. |
| Low-ripple Burst Mode | Maintains <5mVP-P output ripple at µA-level loads-critical for powering RF ICs and precision ADCs without added filtering. |
| Programmable UVLO | EN/UVLO threshold (1.19V) and hysteresis (35mV) allow custom brown-out behavior without external comparators. |
| Thermally enhanced DFN | 3mm × 3mm footprint with exposed pad achieves 45°C/W junction-to-ambient, enabling 350mA continuous output at +85°C ambient. |
Applications
| Automotive Battery Regulation | Industrial Power Supply |
|---|---|
Use Scenario: Regulating raw 12V–48V vehicle battery rail to stable 5V for infotainment MCU and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter delivering 350mA at 5V with AEC-Q100-compliant reliability and fault tolerance. Use Value: Withstands cold-crank (4.2V) and load-dump (62V) transients while maintaining 0.7µA shutdown current for ECU sleep mode compliance. | Use Scenario: Providing isolated 5V logic supply from unregulated 24V factory floor power in PLC I/O modules. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator replacing discrete buck controllers + MOSFET + diodes in space-constrained DIN-rail enclosures. Use Value: Integrated diodes and 3mm × 3mm DFN reduce solution size by 40% vs. controller+external FET designs; 2.5µA IQ extends backup battery runtime. |
| Portable Medical Sensor Node | Smart Building Controller |
Use Scenario: Powering ultra-low-power ECG front-end ASIC and BLE radio from coin-cell or Li-ion battery. IC Role / Device Role / Timing Role: Always-on buck regulator operating in Burst Mode to sustain multi-year battery life. Use Value: 1.8µA no-load IQ and <5mV ripple eliminate need for secondary LDO, preserving battery energy and minimizing noise-induced measurement errors. | Use Scenario: Generating 5V for HVAC zone controllers powered by 24VAC rectified supply with high line ripple. IC Role / Device Role / Timing Role: Input-robust buck converter handling 4.2–62V input swings caused by transformer regulation and rectifier drop variations. Use Value: Wide VIN range and 450mA catch diode current limit prevent latch-up during AC line surges; PG flag enables firmware-controlled 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 |
|---|---|---|---|
| LTC3630EMSE#TRPBF | 40V max VIN, 300mA output, 17µA IQ, MSOP-16 package | Lower voltage rating and higher IQ make it unsuitable for 48V industrial or automotive use; better for cost-sensitive 24V-only systems. | Select only if input never exceeds 40V and thermal budget allows larger MSOP package. |
| TPS54332DR | 28V max VIN, 3.5A output, 4.5µA IQ, SOIC-8 package | Higher current but narrower VIN range; lacks integrated diodes and PG flag; requires external catch diode. | Choose when >350mA load is needed at ≤28V input and board space permits SOIC-8 + external diode. |
Compared with LTC3630EMSE#TRPBF and TPS54332DR, LT3990EDD#TRPBF uniquely combines 62V operation, 350mA output, integrated diodes, sub-3µA IQ, and FMEA-safe DFN packaging-making it the only option for compact, high-reliability 48V-to-5V conversion in harsh environments.
Availability
LT3990EDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and portable medical sensor nodes requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT3990EDD#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, serving industrial, automotive, communications, and healthcare markets.
The LT3990 product line was designed specifically for high-input-voltage, low-quiescent-current DC/DC conversion in automotive and industrial applications where reliability, fault tolerance, and small solution size are mandatory.
FAQ
What is the output voltage configuration of LT3990EDD#TRPBF?
The LT3990EDD#TRPBF is the fixed 5V output variant of the LT3990 family. Unlike the adjustable LT3990, it does not require external feedback resistors-the internal VOUT pin (Pin 6) is pre-configured to regulate precisely to 5V (4.94V to 5.06V over temperature). This eliminates resistor placement errors and saves PCB area in cost-sensitive designs.
Does LT3990EDD#TRPBF require an external boost capacitor?
Yes, LT3990EDD#TRPBF requires an external ceramic capacitor (typically 0.1µF X7R) between BOOST and SW pins to generate the elevated gate drive voltage needed for full saturation of the internal bipolar NPN switch. Without this capacitor, the switch cannot turn on fully, causing excessive conduction loss and potential thermal shutdown.
How does the power good (PG) flag behave on LT3990EDD#TRPBF?
The PG pin on LT3990EDD#TRPBF is an open-drain output that remains low until the regulated 5V output reaches 90% (4.5V) of its final value. It becomes valid only when both VIN exceeds 4.2V and EN/UVLO is high. An external pull-up resistor (e.g., 10kΩ to 5V) is required to assert the high state, enabling reliable power sequencing in multi-rail systems.
Can LT3990EDD#TRPBF operate safely during automotive cold-crank conditions?
Yes, LT3990EDD#TRPBF is rated for minimum input voltage of 4.2V and operates continuously down to this level-fully supporting automotive cold-crank events (typically 4.0–4.5V). Its accurate programmable undervoltage lockout (1.19V EN/UVLO threshold) prevents erratic startup, and the 0.7µA shutdown current minimizes battery drain during cranking-induced brownouts.
What thermal considerations apply to LT3990EDD#TRPBF in its DFN package?
LT3990EDD#TRPBF uses a 10-lead 3mm × 3mm DFN with exposed thermal pad (Pin 11). To achieve the specified θJA = 45°C/W, the pad must be soldered to a minimum 200mm² copper pour connected to 2+ internal ground planes via ≥6 thermal vias (0.3mm diameter). Insufficient copper area or missing vias will cause junction temperatures to exceed 125°C at full 350mA load.
LT3990EDD#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)
LT3990EDD#TRPBF FAQ
1.How can I place an order for LT3990EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990EDD#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 LT3990EDD#TRPBF reliable?
The price and inventory of LT3990EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3990EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3990EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990EDD#TRPBF?
LT3990EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990EDD#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 LT3990EDD#TRPBF?
For technical support, including LT3990EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990EDD#TRPBF requirements.
6.How does Aetrix verify that LT3990EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3990EDD#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 LT3990EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3990EDD#TRPBF?
All LT3990EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990EDD#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 LT3990EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3990EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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