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Analog Devices Inc. LT3990HMSE#TRPBF
- Part No.:
- LT3990HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,258
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Product details
Overview
LT3990HMSE#TRPBF from Analog Devices is a 62V, 350mA monolithic step-down regulator with integrated boost and catch Schottky diodes, 2.5µA quiescent current at 12VIN→3.3VOUT, low-ripple Burst Mode operation (<5mVP-P), and programmable undervoltage lockout (UVLO). It delivers regulated 5V output in automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3990HMSE#TRPBF datasheet, LT3990HMSE#TRPBF pinout, LT3990HMSE#TRPBF application, or LT3990HMSE#TRPBF equivalent, key selection criteria include its H-grade 150°C junction rating, integrated diode architecture eliminating external diodes, 200kHz–2.2MHz adjustable switching frequency, and FMEA-fault-tolerant MSOP package for safety-critical systems.
Technical Context
The LT3990HMSE#TRPBF uses current-mode control with internal slope compensation for fast transient response and loop stability across wide input ranges. Its bipolar NPN power switch is driven by an on-chip charge pump via the BOOST pin, enabling full saturation even at high input voltages up to 62V.
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 protects against shorted outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 62V - supports direct connection to automotive batteries and industrial 48V rails without pre-regulation. |
| Output Current | 350mA - maximum continuous load with thermal derating above 125°C junction temperature. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables always-on operation in battery-powered systems with multi-year standby life. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT-to-GND resistor; higher frequencies allow smaller magnetics but reduce max VIN/VOUT ratio. |
| Feedback Voltage | 1.21V ±1.25% - precise reference enabling accurate output regulation across –40°C to 150°C junction range. |
| Shutdown Current | 0.7µA - ultra-low leakage during disable, critical for energy harvesting and low-power wake-up circuits. |
| Operating Junction Temp | –40°C to +150°C - H-grade qualification ensures reliability in under-hood automotive and high-ambient industrial environments. |
Pinout & Package
LT3990HMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17 = GND), θJA = 40°C/W, θJC = 10°C/W. The exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | FB / VOUT | Feedback sense (LT3990) or fixed-output tap (LT3990-5); dual pins provide redundant path and improved noise immunity. |
| 4 | EN/UVLO | Enable/shutdown control with 1.19V rising threshold and 35mV hysteresis; tied to VIN for always-on operation. |
| 6 | VIN | Main power input (4.2V–62V); requires local ceramic bypassing to suppress high-frequency switching noise. |
| 8 | GND | Power ground; connects to exposed pad (Pin 17) - mandatory soldering required for thermal performance. |
| 9 | SW | Switch node output; connects directly to inductor; high dv/dt node requiring tight layout and minimal trace length. |
| 11 | BOOST | Charge-pump drive voltage source; must exceed SW by ≥30V to fully saturate internal bipolar NPN switch. |
| 13 | BD | Boost diode anode connection; also powers internal bias regulator when >3.2V, improving efficiency at light loads. |
| 14 | PG | Open-drain power-good flag; pulls low until FB reaches 90% of regulation; valid only when VIN > 4.2V and EN high. |
| 16 | RT | Frequency programming node; resistor to GND sets switching frequency from 200kHz to 2.2MHz per datasheet table. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost & Catch Diodes | Eliminates 2 external Schottky diodes, reducing BOM count, board area, and thermal hotspots in compact designs. |
| FMEA-Fault-Tolerant MSOP | Output remains at or below regulation voltage during adjacent-pin shorts or floating pins - certified for ASIL-B automotive systems. |
| Low-Ripple Burst Mode | Maintains <5mVP-P output ripple at light loads while drawing only 1.8µA, enabling clean power for RF and precision analog circuits. |
| Accurate Programmable UVLO | EN/UVLO threshold (1.19V ±5%) with 35mV hysteresis enables precise brown-out protection and system-level power sequencing. |
| AEC-Q100 Qualified (H Grade) | Qualified to AEC-Q100 Rev G Grade 0 (–40°C to +150°C) for engine control, ADAS, and other under-hood applications. |
Applications
| Automotive Battery Regulation | Industrial 24V/48V Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V/48V vehicle battery rail to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V with fault protection and thermal robustness in under-hood environments. Use Value: Eliminates need for external diodes and supports cold-crank (4.2V) to load-dump (62V) transients without external clamping. |
Use Scenario: Powering PLC I/O modules and fieldbus gateways from unregulated 24V or 48V industrial DC rails. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator with integrated protection, enabling single-stage conversion without pre-regulators. Use Value: 150°C H-grade operation ensures reliability in sealed enclosures with ambient temperatures up to 85°C. |
| Portable Medical Instrumentation | Railway Signaling Power |
Use Scenario: Providing ultra-low-quiescent 5V supply for battery-operated ECG monitors and portable ultrasound units. IC Role / Device Role / Timing Role: Always-on power management IC maintaining long shelf life via 2.5µA IQ and 0.7µA shutdown current. Use Value: Low-noise Burst Mode operation prevents audible capacitor squeal and preserves signal integrity in analog front-ends. |
Use Scenario: Converting 72V/110V railway traction battery to 5V for signaling logic and sensor interfaces in rolling stock. IC Role / Device Role / Timing Role: Wide-input buck regulator with robust overvoltage tolerance and fault-limited current delivery. Use Value: Integrated catch diode current limit (450mA valley) prevents thermal runaway during sustained short-circuit events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3639EMSE#PBF | 40V max input, 150mA output, no integrated diodes, 3.5µA IQ - lower voltage/current capability, requires external diodes. | Suitable for space-constrained 24V systems where 62V tolerance is unnecessary; lacks automotive qualification. | Select when cost-sensitive design accepts external diodes and reduced input range; not drop-in for LT3990HMSE#TRPBF. |
| LM5164QDDARQ1 | 100V max input, 350mA output, integrated MOSFETs (no diodes), 15µA IQ - higher voltage rating but higher quiescent current. | Preferred for 72V+ railway or telecom applications; lacks integrated diodes and FMEA fault tolerance. | Choose for >62V input requirements; requires redesign for diode placement and thermal management due to different topology. |
Compared with LTC3639EMSE#PBF and LM5164QDDARQ1, the LT3990HMSE#TRPBF uniquely combines 62V input, integrated Schottky diodes, 2.5µA IQ, and AEC-Q100 H-grade qualification - making it optimal for automotive and high-reliability industrial buck conversion where diode integration and ultra-low IQ are critical.
Availability
LT3990HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 48V power supplies, and portable medical instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for LT3990HMSE#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 buck conversion in harsh environments - emphasizing integrated diodes, FMEA compliance, and extended temperature operation for automotive and industrial applications.
FAQ
What is the maximum input voltage rating for LT3990HMSE#TRPBF?
The LT3990HMSE#TRPBF has an absolute maximum input voltage rating of 62V on the VIN pin and 75V on the BOOST pin. It operates continuously from 4.2V to 62V, supporting automotive cold-crank and load-dump conditions without external protection circuitry. This rating is validated across its full –40°C to +150°C junction temperature range.
Does LT3990HMSE#TRPBF require external diodes?
No, the LT3990HMSE#TRPBF integrates both the boost Schottky diode and catch Schottky diode on-die. This eliminates two external components, reduces board area, improves thermal performance, and simplifies layout - confirmed in the device's block diagram, pin functions, and typical application schematics.
What is the purpose of the BD pin on LT3990HMSE#TRPBF?
The BD pin on LT3990HMSE#TRPBF serves two roles: it connects to the anode of the internal boost diode, and - when biased above 3.2V - supplies power to the internal bias regulator, improving light-load efficiency. This dual function is explicitly documented in the Pin Functions section and Applications Information.
How does LT3990HMSE#TRPBF achieve low output ripple in Burst Mode?
The LT3990HMSE#TRPBF achieves <5mVP-P output ripple in Burst Mode through optimized control-loop dynamics and minimized burst energy per cycle. Its low-ripple Burst Mode architecture is characterized in Typical Performance Graphs G26–G27 and specified in the Features list - distinct from standard Burst Mode regulators that exhibit higher ripple.
Is LT3990HMSE#TRPBF pin-compatible with other LT3990 variants?
Yes, all LT3990 variants in the 16-lead MSOP package - including LT3990EMSE#TRPBF, LT3990IMSE#TRPBF, and LT3990HMSE#TRPBF - share identical pinout, footprint, and thermal pad configuration. Only the temperature grade and output voltage option (e.g., -5 suffix) differ; the LT3990HMSE#TRPBF is the H-grade (–40°C to +150°C) version.
LT3990HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3990HMSE#TRPBF FAQ
1.How can I place an order for LT3990HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990HMSE#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 LT3990HMSE#TRPBF reliable?
The price and inventory of LT3990HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3990HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3990HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990HMSE#TRPBF?
LT3990HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990HMSE#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 LT3990HMSE#TRPBF?
For technical support, including LT3990HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3990HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3990HMSE#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 LT3990HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3990HMSE#TRPBF?
All LT3990HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990HMSE#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 LT3990HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3990HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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