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Analog Devices Inc. LT3990HMSE#PBF
- Part No.:
- LT3990HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:243
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Product details
Overview
LT3990HMSE#PBF 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 (UVLO). It delivers regulated 5V output in automotive battery regulation and industrial power supply applications.
For engineers reviewing the LT3990HMSE#PBF datasheet, LT3990HMSE#PBF pinout, LT3990HMSE#PBF application, or LT3990HMSE#PBF equivalent, key selection criteria include its AEC-Q100 qualification, 150°C junction-rated MSOP package, integrated diode architecture eliminating external Schottky requirements, and FMEA-fault-tolerant pin behavior during adjacent short or floating conditions.
Technical Context
The LT3990HMSE#PBF implements constant-frequency current-mode control with adjustable switching frequency (200kHz–2.2MHz) set by an external RT resistor. Its internal bipolar NPN switch is driven via a BOOST capacitor to ensure full saturation, enabling high efficiency across wide input ranges (4.2V–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 (450mA typical) provides fault protection during shorted-output conditions.
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 without pre-regulation. |
| Output Current | 350mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables multi-year battery life in always-on monitoring devices. |
| Switching Frequency | 200kHz to 2.2MHz - allows optimization of inductor size (e.g., 33µH at 400kHz) and EMI profile per application needs. |
| Output Ripple | <5mVP-P in Burst Mode - meets noise-sensitive analog and RF subsystem requirements without additional filtering. |
| Junction Temperature | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| UVLO Threshold | 1.19V with 35mV hysteresis - provides precise, stable startup and shutdown control independent of input rail droop. |
Pinout & Package
LT3990HMSE#PBF uses 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 |
|---|---|---|
| FB (Pins 1,2) | Feedback reference input | Regulates to 1.21V; dual pins provide redundant path for reliability-critical feedback divider routing. |
| EN/UVLO (Pin 4) | Enable and UVLO control | Active-high enable with 1.19V threshold; accurate only when VIN ≥ 4.2V; ties directly to VIN if shutdown not required. |
| VIN (Pin 6) | Main power input | Supplies internal circuitry and switch; requires local ceramic bypass (1–4.7µF X7R/X5R) placed adjacent to pin. |
| GND (Pins 8,17) | Power and signal ground | Exposed pad (Pin 17) is GND and mandatory for thermal performance and noise immunity. |
| SW (Pin 9) | Switch node output | Connects to inductor; carries high di/dt switching current - requires short, low-inductance PCB trace. |
| BOOST (Pin 11) | Bootstrap drive voltage | Drives internal NPN switch; requires external capacitor between BOOST and SW to generate >VIN voltage. |
| BD (Pin 13) | Boost diode anode | Connects to external boost diode anode; supplies bias current to internal regulator when BD > 3.2V. |
| PG (Pin 14) | Power good open-drain flag | Asserts high when FB reaches 90% of regulation; valid only when VIN > 4.2V and EN/UVLO is high. |
| RT (Pin 16) | Frequency programming | Resistor to GND sets switching frequency (200kHz–2.2MHz); value selected per Table 1 in datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost & Catch Diodes | Eliminates need for two external Schottky diodes, reducing BOM count, board area, and thermal hotspots. |
| FMEA-Fault-Tolerant MSOP Package | Output remains at or below regulation voltage during adjacent-pin shorts or floating pins - critical for ASIL-B/C automotive safety compliance. |
| AEC-Q100 Qualified (H-grade) | Guaranteed operation from –40°C to +150°C junction temperature with automotive-reliability screening and traceability. |
| Low-Ripple Burst Mode | Maintains <5mVP-P output ripple at light loads while achieving 1.8µA no-load supply current - ideal for always-on sensor nodes. |
| Accurate Programmable UVLO | 1.19V threshold with 35mV hysteresis enables precise system-level brown-out detection without external comparators. |
Applications
| Automotive Battery Regulation | Industrial 24V/48V Power Supply |
|---|---|
Use Scenario: Regulating raw vehicle battery (9V–60V) to stable 5V for infotainment MCU and CAN transceivers in engine bay or under-seat locations. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V with AEC-Q100 H-grade thermal robustness and fault-tolerant pin behavior. Use Value: Enables single-stage conversion without pre-regulator, reducing component count and improving system efficiency over wide input transients. | Use Scenario: Powering PLC I/O modules and fieldbus gateways from unregulated 24V or 48V industrial rails subject to load dump and surge events. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator providing 5V for isolated RS-485 transceivers and ARM-based controllers. Use Value: Withstands 62V max input and includes catch diode current limiting to survive sustained overloads and short circuits. |
| Portable Medical Sensor Hub | Smart Building Controller |
Use Scenario: Long-life battery-powered wearable sensor node requiring ultra-low quiescent current and clean 3.3V for BLE SoC and analog front-end. IC Role / Device Role / Timing Role: Efficient 3.3V buck regulator operating in Burst Mode to extend coin-cell or Li-SOCl₂ battery life beyond 5 years. Use Value: 2.5µA IQ at 12VIN→3.3VOUT and <5mV ripple ensure reliable low-power wireless communication and precision ADC operation. | Use Scenario: Distributed HVAC controller powered from PoE-derived 48V or building-supplied 24V, needing compact, thermally efficient 5V for microcontroller and Zigbee module. IC Role / Device Role / Timing Role: Space-constrained buck regulator with integrated diodes and 3mm×3mm-equivalent footprint in MSOP package. Use Value: Reduces total solution size by eliminating two external diodes and simplifies layout with single-exposed-pad thermal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | Lower max input (42V), lower IQ (1.2µA), no integrated catch diode, requires external Schottky. | Suitable for lower-voltage industrial rails where 62V capability is unnecessary and lowest possible IQ is prioritized. | Select LTC3631EMSE#PBF only if input stays ≤42V and external diode placement is acceptable for layout constraints. |
| MAX20004AATE+T | 42V max input, 2.2µA IQ, integrated diodes, AEC-Q100 Grade 1 (–40°C to +125°C), no FMEA fault tolerance. | Applicable in cabin electronics where 150°C junction rating is not required and fault-tolerant pin behavior is non-critical. | Choose MAX20004AATE+T for cost-sensitive automotive interior modules where full H-grade thermal range is unnecessary. |
Compared with LTC3631EMSE#PBF and MAX20004AATE+T, LT3990HMSE#PBF uniquely combines 62V input capability, integrated diodes, AEC-Q100 H-grade qualification, and FMEA-fault-tolerant packaging - making it the only option for under-hood automotive and high-reliability 48V industrial applications demanding all four attributes.
Availability
LT3990HMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 48V power supplies, and portable medical sensor hubs requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LT3990HMSE#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 industrial, automotive, communications, and healthcare markets.
The LT3990 product line delivers high-input-voltage, low-quiescent-current buck regulators with integrated diodes and automotive qualification - designed specifically for harsh-environment power conversion where reliability, thermal robustness, and fault tolerance are non-negotiable.
FAQ
What is the maximum junction temperature specification for LT3990HMSE#PBF?
The LT3990HMSE#PBF is guaranteed over the full operating junction temperature range of –40°C to +150°C, with thermal derating applied above 125°C to maintain lifetime reliability. This H-grade rating is validated per AEC-Q100 stress test requirements and enables use in under-hood automotive and high-ambient industrial environments where standard E- or I-grade parts would fail.
Does LT3990HMSE#PBF require external diodes for operation?
No, LT3990HMSE#PBF integrates both the boost diode and catch diode on-die, eliminating the need for external Schottky diodes. This integration reduces bill-of-materials count, PCB area, thermal hotspots, and layout complexity - confirmed in the device's "Integrated Boost and Catch Diodes" feature and block diagram.
How does the power good (PG) flag behave on LT3990HMSE#PBF?
The PG pin on LT3990HMSE#PBF is an open-drain output that remains low until the FB pin reaches 90% of its regulated voltage (1.089V for standard LT3990, or 90% of fixed 3.3V/5V for variants). PG is valid only when VIN > 4.2V and EN/UVLO is high, and requires an external pull-up resistor to indicate power-good status to system controllers.
What package type and thermal characteristics define LT3990HMSE#PBF?
LT3990HMSE#PBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND). Its thermal resistance is θJA = 40°C/W and θJC = 10°C/W, requiring the exposed pad to be soldered to a thermal plane on the PCB for optimal heat dissipation and long-term reliability at 150°C junction temperature.
Can LT3990HMSE#PBF operate in Burst Mode with less than 5mV output ripple?
Yes, LT3990HMSE#PBF maintains output ripple below 5mVP-P in low-ripple Burst Mode operation across the full load range in typical applications - a key specification verified in the "Low Ripple Burst Mode® Operation" feature and confirmed in Figure 1 (Worst-Case Output Ripple) of the datasheet.
LT3990HMSE#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:
- 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#PBF FAQ
1.How can I place an order for LT3990HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990HMSE#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#PBF reliable?
The price and inventory of LT3990HMSE#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#PBF is usually 5 days.
3.What payment methods are accepted for LT3990HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990HMSE#PBF?
LT3990HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990HMSE#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#PBF?
For technical support, including LT3990HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990HMSE#PBF requirements.
6.How does Aetrix verify that LT3990HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3990HMSE#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#PBF meets industry standards.
7.What is the process for return or replacement of LT3990HMSE#PBF?
All LT3990HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990HMSE#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#PBF part is unused and in its original packaging.
Return procedure for LT3990HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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