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Analog Devices Inc. LT3990HMSE-3.3#TRPBF
- Part No.:
- LT3990HMSE-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990HMSE-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,607
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Product details
Overview
LT3990HMSE-3.3#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, fixed 3.3V output, and low-ripple Burst Mode operation delivering <5mVP-P output ripple. It serves as a primary DC/DC power stage in automotive battery-supplied systems requiring high input voltage tolerance and ultra-low standby power.
For engineers reviewing the LT3990HMSE-3.3#TRPBF datasheet, LT3990HMSE-3.3#TRPBF pinout, LT3990HMSE-3.3#TRPBF application, or LT3990HMSE-3.3#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, –40°C to 150°C junction temperature rating, integrated diode architecture eliminating external diode BOM, and programmable UVLO with 35mV hysteresis for robust cold-crank operation.
Technical Context
The LT3990HMSE-3.3#TRPBF implements a constant-frequency current-mode control architecture with internal bipolar NPN switch, enabling fast transient response and stable loop behavior across wide input ranges. Its integrated boost diode supplies gate drive above VIN to fully saturate the switch, while the catch diode current limit (450mA typical) provides fault protection during shorted-output conditions.
Burst Mode operation reduces quiescent current to 1.8µA at light loads while maintaining output regulation and limiting ripple to <5mVP-P; the power-good flag asserts when VOUT reaches 90% of nominal, and the EN/UVLO threshold (1.19V rising, 35mV hysteresis) ensures reliable startup under automotive battery droop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 62V - supports direct connection to 12V/24V/48V automotive batteries including cold-crank transients. |
| Output Voltage | Fixed 3.3V ±1.2% - factory-trimmed for precision without external feedback resistors. |
| Max Output Current | 350mA - limited by internal switch peak current (700mA typ) and catch diode valley current (450mA typ). |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >1-year battery runtime in always-on vehicle modules. |
| Switching Frequency | 200kHz to 2.2MHz - set externally via RT resistor; higher frequencies allow smaller magnetics but reduce max duty cycle. |
| Output Ripple | <5mVP-P in Burst Mode - meets noise-sensitive MCU and sensor supply requirements without additional LDO post-regulation. |
| Operating Temp | –40°C to +150°C junction - H-grade MSOP package qualified for under-hood automotive placement. |
Pinout & Package
LT3990HMSE-3.3#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17 = GND), θJA = 40°C/W. The exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 & 2 (VOUT) | Fixed-output feedback node | Internally connected to precision 3.3V reference divider; tie both pins directly to output capacitor for redundancy and noise immunity. |
| Pin 4 (EN/UVLO) | Enable and undervoltage lockout input | Active-high enable with 1.19V threshold and 35mV hysteresis; ensures shutdown below battery brownout thresholds. |
| Pin 6 (VIN) | Main power input | Supplies internal circuitry and switch; requires local 1µF–4.7µF ceramic bypass close to pin. |
| Pin 8 (GND) | Signal ground | One of multiple GND connections; used with exposed pad (Pin 17) for low-impedance return path. |
| Pin 9 (SW) | Switch node | Drives external inductor; carries high di/dt switching current - layout critical for EMI control. |
| Pin 11 (BOOST) | Bootstrap drive supply | Connects to external capacitor charged above VIN to fully saturate internal bipolar switch; max 75V rating. |
| Pin 13 (BD) | Boost diode anode | Accepts external boost diode anode; also powers internal bias regulator when >3.2V, improving light-load efficiency. |
| Pin 14 (PG) | Power good open-drain flag | Asserts high (via external pull-up) when VOUT ≥ 90% of 3.3V; valid only when VIN > 4.2V and EN high. |
| Pin 16 (RT) | Frequency programming | Resistor-to-ground sets switching frequency from 200kHz to 2.2MHz; determines inductor size and efficiency trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost & catch Schottky diodes | Eliminates two external diodes, reducing BOM count, board area, and forward-drop losses in compact automotive modules. |
| AEC-Q100 qualified (H-grade) | Guaranteed operation from –40°C to +150°C junction temperature with full parametric validation for automotive safety-critical systems. |
| FMEA fault-tolerant pinout | Output remains regulated or safely clamped if adjacent pins short or any NC pin floats - critical for ASIL-B/C system compliance. |
| Low-ripple Burst Mode | Maintains <5mVP-P output ripple at µA-level loads while achieving 1.8µA shutdown current, enabling always-on telematics and alarm circuits. |
| Accurate programmable UVLO | EN/UVLO threshold (1.19V ±50mV) with 35mV hysteresis allows precise cold-crank detection and prevents erratic restart during battery recovery. |
Applications
| Automotive Body Control Module (BCM) | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and door-lock actuators from 12V battery with cold-crank resilience. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing clean, regulated supply with UVLO tracking battery voltage sag. Use Value: 2.5µA quiescent current extends battery life during vehicle sleep mode; integrated diodes reduce footprint by 25% vs discrete solutions. | Use Scenario: Remote environmental monitoring unit powered by 24V industrial rail with long-term unattended operation. IC Role / Device Role / Timing Role: Main DC/DC converter delivering stable 3.3V to ultra-low-power MCU and wireless SoC. Use Value: 62V input rating accommodates 24V system surges; <5mV ripple avoids ADC measurement errors in precision sensor front-ends. |
| ADAS Camera Power Supply | Railway Onboard Telematics |
Use Scenario: Powering image sensor and ISP in automotive camera module mounted near engine compartment. IC Role / Device Role / Timing Role: High-temp-rated 3.3V regulator operating continuously at 125°C ambient with thermal derating. Use Value: H-grade MSOP package rated to 150°C junction enables direct mounting on camera PCB without heatsink; FMEA design prevents single-point failure. | Use Scenario: Power conversion for train-mounted GPS tracker and cellular modem operating from 72V–110V railway supply. IC Role / Device Role / Timing Role: Input-stage buck converter stepping down high-voltage rail to intermediate 12V or 5V bus. Use Value: 62V absolute max input withstands 110V transients per EN 50155; low IQ minimizes parasitic drain on backup battery during depot storage. |
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-3.3#TRPBF | Same 3.3V fixed output, but lower 40V max input and no integrated catch diode; requires external Schottky. | Suitable for non-automotive industrial use where input voltage stays ≤40V and thermal margin allows external diode. | Select when cost sensitivity outweighs integration benefit and input range is constrained. |
| TPS54332DR | 3.3V adjustable via feedback resistors; 28V max input; no integrated diodes; 4.5µA IQ - double LT3990HMSE-3.3#TRPBF's quiescent current. | Targeted at consumer electronics with stable 12V inputs; lacks AEC-Q100 and high-temp qualification. | Choose only for non-automotive, non-mission-critical designs where BOM cost is prioritized over reliability and thermal performance. |
Compared with LTC3639EMSE-3.3#TRPBF and TPS54332DR, LT3990HMSE-3.3#TRPBF delivers superior automotive readiness through its 62V input, integrated diodes, AEC-Q100 H-grade rating, and sub-3µA quiescent current - making it the sole option for under-hood deployment with cold-crank support and zero external diode count.
Availability
LT3990HMSE-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial IoT sensor nodes, and ADAS camera power supplies requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LT3990HMSE-3.3#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 automotive, industrial, and communications markets with rigorously tested, application-optimized components.
The LT3990 product line was designed specifically for automotive and harsh-environment DC/DC conversion, emphasizing ultra-low IQ, wide VIN tolerance, integrated power devices, and AEC-Q100 reliability - targeting battery-powered systems where efficiency, space, and fault resilience are critical.
FAQ
What is the maximum input voltage rating for LT3990HMSE-3.3#TRPBF?
The LT3990HMSE-3.3#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, making it suitable for 12V, 24V, and 48V automotive and industrial rails including cold-crank and load-dump transients. Exceeding 62V on VIN risks permanent damage per Absolute Maximum Ratings.
Does LT3990HMSE-3.3#TRPBF require external diodes?
No, LT3990HMSE-3.3#TRPBF integrates both the boost Schottky diode and catch Schottky diode on-die. This eliminates the need for two external diodes typically required in buck converters, reducing bill-of-materials count, PCB area, and forward-voltage losses. The BD pin connects to the anode of the internal boost diode, and SW connects directly to the inductor without external rectification.
What is the purpose of the dual VOUT pins (Pins 1 and 2) on LT3990HMSE-3.3#TRPBF?
The dual VOUT pins on LT3990HMSE-3.3#TRPBF are internally connected and provide redundant feedback paths to the fixed 3.3V output divider. Both pins must be tied directly to the output capacitor's positive terminal to ensure signal integrity, reduce noise coupling, and improve fault tolerance - a design feature supporting AEC-Q100 FMEA requirements for automotive applications.
How does the power-good (PG) flag behave on LT3990HMSE-3.3#TRPBF?
The PG pin on LT3990HMSE-3.3#TRPBF is an open-drain output that remains low until the regulated 3.3V output reaches 90% (2.97V) of its nominal value. It becomes valid only when VIN exceeds 4.2V and EN/UVLO is high. An external pull-up resistor is required; PG asserts high to signal system readiness, enabling safe processor boot sequencing in automotive and industrial controllers.
Is LT3990HMSE-3.3#TRPBF pin-compatible with other LT3990 variants?
Yes, LT3990HMSE-3.3#TRPBF shares identical pinout and package (16-lead MSOP) with all other LT3990-XMSE variants, including LT3990HMSE-5#TRPBF and LT3990EMSE-3.3#TRPBF. Differences are limited to output voltage (3.3V vs 5V), temperature grade (H vs E/I), and packaging (TRPBF tape-and-reel). No PCB layout change is needed when substituting within the same MSOP package family.
LT3990HMSE-3.3#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:
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3990HMSE-3.3#TRPBF FAQ
1.How can I place an order for LT3990HMSE-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990HMSE-3.3#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-3.3#TRPBF reliable?
The price and inventory of LT3990HMSE-3.3#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-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3990HMSE-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990HMSE-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990HMSE-3.3#TRPBF?
LT3990HMSE-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990HMSE-3.3#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-3.3#TRPBF?
For technical support, including LT3990HMSE-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990HMSE-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3990HMSE-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3990HMSE-3.3#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-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3990HMSE-3.3#TRPBF?
All LT3990HMSE-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990HMSE-3.3#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-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3990HMSE-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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