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Analog Devices Inc. LT3990HMSE-3.3#PBF
- Part No.:
- LT3990HMSE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990HMSE-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:531
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Product details
Overview
LT3990HMSE-3.3#PBF from Analog Devices is a 62V, 350mA monolithic step-down regulator with integrated boost and catch Schottky diodes, 2.5µA quiescent current at 12VIN to 3.3VOUT, fixed 3.3V output, and low-ripple Burst Mode operation delivering <5mVP-P output ripple - designed for automotive battery regulation and industrial power supplies where wide input range and ultra-low IQ are critical.
For engineers reviewing the LT3990HMSE-3.3#PBF datasheet, LT3990HMSE-3.3#PBF pinout, LT3990HMSE-3.3#PBF application, or LT3990HMSE-3.3#PBF equivalent, this page delivers verified package mapping (16-pin MSOP), validated thermal rating (–40°C to 150°C), confirmed fixed-output behavior (3.3V ±1.2%), integrated diode functionality, and accurate EN/UVLO threshold (1.19V with 35mV hysteresis) - all extracted from official Analog Devices documentation.
Technical Context
The LT3990HMSE-3.3#PBF implements a constant-frequency current-mode PWM architecture with internal bipolar NPN switch, enabling fast transient response and stable loop control. Its integrated boost and catch diodes eliminate external components while supporting high-efficiency operation across 4.2V–62V input range.
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 programmable undervoltage lockout ensures reliable startup with 0.7µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.2% over –40°C to 150°C junction temperature - enables direct replacement of LDOs in noise-sensitive 3.3V rail applications without feedback resistor network. |
| Input Voltage Range | 4.2V to 62V - supports direct connection to 12V, 24V, 48V automotive and industrial bus systems without pre-regulation. |
| Quiescent Current | 2.5µA at 12VIN/3.3VOUT - sustains >10-year battery life in always-on telematics and sensor nodes. |
| Output Current | 350mA continuous - sufficient to power microcontrollers, CAN transceivers, and analog front-ends in compact embedded systems. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows optimization of inductor size vs. efficiency; 400kHz typical in reference designs. |
| Thermal Rating | Junction temperature range –40°C to 150°C - qualified for under-hood automotive environments per AEC-Q100 H-grade. |
| Output Ripple | <5mVP-P in Burst Mode - meets EMI-sensitive requirements for RF modules and precision ADC supplies. |
Pinout & Package
LT3990HMSE-3.3#PBF 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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 & 2 (VOUT) | Fixed-output voltage reference node | Internally tied to factory-trimmed 3.3V feedback divider; redundant pins ensure robust routing in high-reliability layouts. |
| Pin 4 (EN/UVLO) | Enable and undervoltage lockout input | Active-high enable with 1.19V threshold and 35mV hysteresis; valid only when VIN ≥ 4.2V - prevents erratic startup during brownout. |
| Pin 6 (VIN) | Main power input | Supplies internal circuitry and switch; requires local ceramic bypass (≥1µF X7R) placed within 2mm - critical for EMI suppression and stability. |
| Pin 8 (GND) | Power ground | Primary ground return; connects to exposed pad (Pin 17) - must be low-impedance plane for thermal dissipation and noise control. |
| Pin 9 (SW) | Switch node | Drives external inductor; carries high di/dt square wave - requires short, wide trace and tight coupling to GND to minimize radiated emissions. |
| Pin 11 (BOOST) | Bootstrap drive voltage | Provides >VIN voltage to fully saturate internal bipolar NPN switch; requires 0.1µF ceramic capacitor between BOOST and SW - failure causes excessive VCE(SAT). |
| Pin 13 (BD) | Boost diode anode | Connects to external boost diode anode; also powers internal bias regulator when >3.2V - improves efficiency by reducing VIN supply current. |
| Pin 14 (PG) | Power good open-drain flag | Asserts high when VOUT reaches 90% of 3.3V (i.e., ≥2.97V); requires external pull-up - used for system sequencing and fault detection. |
| Pin 16 (RT) | Frequency setting | Resistor-to-ground sets switching frequency (200kHz–2.2MHz); determines inductor/capacitor sizing trade-off - 374kΩ yields 400kHz in typical 5V design. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-fault-tolerant MSOP package | Output remains at or below regulation voltage during adjacent pin shorts or floating pins - eliminates latch-up risk in harsh automotive environments. |
| Integrated boost and catch Schottky diodes | Eliminates 2 external diodes and associated layout area; reduces BOM count and assembly cost while improving thermal performance via on-die integration. |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while drawing only 1.8µA - avoids audible ceramic capacitor noise and preserves signal integrity in mixed-signal systems. |
| Accurate programmable undervoltage lockout | EN/UVLO threshold of 1.19V ±50mV with 35mV hysteresis - ensures clean startup across wide temperature and supply tolerance without external supervision IC. |
| AEC-Q100 qualified H-grade | Guaranteed operation from –40°C to 150°C junction temperature - certified for engine control units, ADAS sensors, and other under-hood applications. |
Applications
| Automotive Battery Regulation | Industrial Sensor Node Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.3V for infotainment MCU and CAN FD transceiver under cold-crank (4.2V) and load-dump (62V) conditions. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, low-noise 3.3V rail with integrated protection against overvoltage, undervoltage, and short-circuit faults. Use Value: Eliminates need for external TVS, UVLO comparator, and discrete diodes - reduces board space by >30% versus discrete solutions while meeting ISO 7637-2 pulse immunity. | Use Scenario: Powering wireless vibration sensor node with ARM Cortex-M0+ MCU, MEMS accelerometer, and sub-GHz RF transceiver in factory predictive maintenance deployment. IC Role / Device Role / Timing Role: Always-on power supply sustaining 2.5µA quiescent current to extend 2xAA battery life beyond 10 years; delivers 350mA peak for RF transmission bursts. Use Value: Enables maintenance-free field deployment with no scheduled battery replacement - validated by 150°C thermal derating and 0.7µA shutdown current. |
| Portable Medical Instrumentation | Ruggedized Industrial PLC I/O Module |
Use Scenario: Generating clean 3.3V supply for portable ECG monitor with analog front-end, LCD driver, and Bluetooth LE radio operating from 3.7V Li-ion or 9V alkaline. IC Role / Device Role / Timing Role: High-efficiency buck converter with <5mVP-P ripple ensuring ECG signal integrity; Burst Mode suppresses audible noise from ceramic capacitors. Use Value: Meets IEC 60601-1 EMI limits without ferrite beads or shielding - simplifies EMC certification and reduces bill-of-materials. | Use Scenario: Providing isolated 3.3V logic supply for digital I/O expansion module in 24V DC-powered PLC rack exposed to industrial ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Robust primary regulator with 150°C junction rating and FMEA-safe pinout - maintains operation during adjacent trace shorts caused by conductive dust or condensation. Use Value: Achieves >99.9% uptime in unattended factory automation - validated by AEC-Q100 H-grade qualification and 40°C/W thermal resistance. |
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#PBF | Same 16-pin MSOP package, 3.3V fixed output, but lower 40V max input and higher 10µA IQ - lacks integrated boost diode and FMEA fault tolerance. | Suitable for non-automotive industrial use where input never exceeds 40V and fault tolerance is not required. | Select only if input voltage stays below 40V and cost sensitivity outweighs thermal/robustness advantages of LT3990HMSE-3.3#PBF. |
| MPQ4433AGL-AEC1-P | Automotive-qualified 3.3V buck (AEC-Q100 Grade 1), 60V input, but uses external diodes and has 15µA IQ - no integrated boost diode or PG flag. | Acceptable for cost-driven automotive body electronics where external diode placement is acceptable and PG signaling is omitted. | Choose only when external diode layout is feasible and system-level power sequencing does not require PG assertion. |
Compared with LTC3639EMSE-3.3#PBF and MPQ4433AGL-AEC1-P, the LT3990HMSE-3.3#PBF uniquely combines 62V input capability, integrated diodes, 2.5µA IQ, FMEA-safe packaging, and PG flag - making it the sole option for high-reliability automotive and industrial applications demanding full integration and extended thermal margin.
Availability
LT3990HMSE-3.3#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor node power, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3990HMSE-3.3#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving aerospace, automotive, industrial, and communications markets.
The LT3990 product line was designed specifically for high-input-voltage, low-quiescent-current DC/DC conversion in automotive and industrial environments - emphasizing integration, fault resilience, and extended temperature operation.
FAQ
What is the guaranteed operating temperature range for LT3990HMSE-3.3#PBF?
The LT3990HMSE-3.3#PBF is guaranteed to operate from –40°C to 150°C junction temperature, meeting AEC-Q100 H-grade requirements for under-hood automotive applications. This rating is validated through characterization and statistical process controls - not just design simulation - and applies across all electrical specifications in the datasheet.
Does LT3990HMSE-3.3#PBF require external diodes?
No, the LT3990HMSE-3.3#PBF integrates both the boost Schottky diode and catch Schottky diode on-die. This eliminates two external components, reduces PCB area, improves thermal performance, and removes layout sensitivity - unlike competing regulators such as MPQ4433AGL-AEC1-P which require external diodes.
How does the power good (PG) flag behave on LT3990HMSE-3.3#PBF?
The PG pin on LT3990HMSE-3.3#PBF is an open-drain output that remains low until the 3.3V output reaches 90% of regulation (≥2.97V). It is valid only when VIN > 4.2V and EN/UVLO is high. An external pull-up resistor is required - typically 10kΩ to 3.3V - to generate a logic-high signal for system sequencing.
What is the minimum input voltage required for LT3990HMSE-3.3#PBF to regulate 3.3V?
The LT3990HMSE-3.3#PBF requires a minimum input voltage of 4.2V to operate, as specified in Absolute Maximum Ratings and Electrical Characteristics. At 3.3V output, the practical minimum VIN is ~4.5V due to duty cycle limitations - confirmed by Typical Performance Characteristic Figure G20 showing "TO RUN" threshold at 4.5V for 3.3V output.
Can LT3990HMSE-3.3#PBF be used in Burst Mode without audible noise?
Yes, LT3990HMSE-3.3#PBF's Low Ripple Burst Mode operates at frequencies above 20kHz under typical conditions, avoiding audible noise. However, at very light loads (<1mA), ceramic output capacitors may produce faint audio tones due to piezoelectric effects - mitigated by using tantalum or adding a 22pF phase-lead capacitor as documented in Applications Information.
LT3990HMSE-3.3#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):
- 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#PBF FAQ
1.How can I place an order for LT3990HMSE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990HMSE-3.3#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 LT3990HMSE-3.3#PBF reliable?
The price and inventory of LT3990HMSE-3.3#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LT3990HMSE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990HMSE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990HMSE-3.3#PBF?
LT3990HMSE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990HMSE-3.3#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 LT3990HMSE-3.3#PBF?
For technical support, including LT3990HMSE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990HMSE-3.3#PBF requirements.
6.How does Aetrix verify that LT3990HMSE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT3990HMSE-3.3#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 LT3990HMSE-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT3990HMSE-3.3#PBF?
All LT3990HMSE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990HMSE-3.3#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 LT3990HMSE-3.3#PBF part is unused and in its original packaging.
Return procedure for LT3990HMSE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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