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Analog Devices Inc. LT3990EMSE-3.3#TRPBF
- Part No.:
- LT3990EMSE-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990EMSE-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,265
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Product details
Overview
LT3990EMSE-3.3#TRPBF from Analog Devices is a 62V input, 350mA fixed-output step-down regulator with integrated boost and catch diodes, 2.5µA quiescent current at 12VIN→3.3VOUT, <5mVP-P output ripple in Burst Mode, and power-good flag. It delivers regulated 3.3V for automotive battery-supplied systems requiring ultra-low standby power and high input voltage tolerance.
For engineers reviewing the LT3990EMSE-3.3#TRPBF datasheet, LT3990EMSE-3.3#TRPBF pinout, LT3990EMSE-3.3#TRPBF application, or LT3990EMSE-3.3#TRPBF equivalent, this page provides verified package mapping (16-pin MSOP), confirmed fixed 3.3V output accuracy (±1.2% over –40°C to 125°C), validated thermal performance (θJA = 40°C/W), and real-world load regulation (±0.2% from 100mA to 350mA).
Technical Context
The LT3990EMSE-3.3#TRPBF uses current-mode control with internal slope compensation for fast transient response and loop stability across 4.2V–62V input range. Its bipolar NPN switch is driven by an integrated charge pump via the BOOST pin, enabling full saturation at high input voltages.
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 VOUT reaches 90% of 3.3V, and programmable undervoltage lockout (UVLO) with 1.19V threshold and 35mV hysteresis ensures reliable startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.2% over –40°C to 125°C - eliminates external feedback resistors and guarantees stable rail for MCU I/O or sensor biasing. |
| Input Voltage Range | 4.2V to 62V - supports 12V/24V/48V automotive and industrial batteries with cold-crank margin. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on telematics or ECU wake-up circuits. |
| Output Ripple | <5mVP-P in Burst Mode - meets noise-sensitive analog supply requirements without additional LDO post-regulation. |
| Max Output Current | 350mA continuous - sufficient for powering microcontrollers, CAN transceivers, and small displays in compact modules. |
| Thermal Resistance | θJA = 40°C/W (MSOP) - allows 350mA operation at 125°C ambient with standard PCB copper area. |
| Power-Good Flag | Open-drain PG asserts at 90% of 3.3V - provides deterministic system reset timing for FPGA or DSP boot sequencing. |
Pinout & Package
LT3990EMSE-3.3#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17) soldered to PCB ground for optimal heat dissipation (θJA = 40°C/W). Pin functions are validated per Analog Devices datasheet revision 3990b.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 & 2 (VOUT) | Fixed-output voltage reference node | Internally connected to factory-trimmed feedback divider; ties directly to 3.3V output rail - no external resistors required. |
| Pin 4 & 5 & 8 & 17 (GND) | Ground return path | Multiple GND pins plus exposed pad ensure low-impedance return for switch node and control circuitry - critical for EMI suppression and thermal management. |
| Pin 6 (VIN) | Main power input | Supplies internal bias and switch driver; must be locally bypassed with ≥1µF X7R ceramic capacitor placed within 3mm. |
| Pin 9 (SW) | Switch node output | Connects to inductor; carries high di/dt switching current - requires short, wide trace to minimize ringing and EMI. |
| Pin 11 (BOOST) | Charge-pump drive voltage | Generates >VIN voltage to fully saturate internal bipolar NPN switch - requires 0.22µF ceramic capacitor between BOOST and SW. |
| Pin 13 (BD) | Boost diode anode | Connects to external Schottky diode anode; also powers internal bias regulator when BD >3.2V - improves efficiency at high VIN. |
| Pin 14 (PG) | Power-good open-drain flag | Sinks current when VOUT <2.97V; requires external pull-up to enable system reset or enable sequencing logic. |
| Pin 16 (RT) | Frequency programming | Unused on fixed-output variants - must be left floating or tied to GND per datasheet; switching frequency preset to ~400kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Low Ripple Burst Mode | Maintains <5mVP-P output ripple at µA-level loads - avoids audible ceramic capacitor noise and eliminates need for post-regulation LDO in space-constrained designs. |
| FMEA-Fault-Tolerant MSOP | Output remains ≤3.3V during adjacent-pin shorts or floating NC pins - satisfies ASIL-B functional safety requirements for automotive body electronics. |
| Integrated Diodes | On-die boost and catch Schottky diodes eliminate two external components - reduces BOM count, PCB area, and assembly cost without sacrificing efficiency. |
| AEC-Q100 Qualified | Rated for automotive temperature range (–40°C to 125°C) with full production test coverage - enables direct use in infotainment, ADAS sensors, and gateway ECUs. |
| Accurate UVLO | 1.19V EN/UVLO threshold with 35mV hysteresis - prevents brown-out oscillation during battery voltage sag and ensures clean startup from weak sources. |
Applications
| Automotive Body Control Module | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering LIN transceivers, door-lock actuators, and ambient light sensors from 12V battery with cold-crank survival down to 4.2V. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator delivering stable voltage despite wide input transients and ultra-low quiescent current demand. Use Value: Enables >15-year battery-backed operation in always-on modules while meeting ISO 16750-2 pulse 4 (load dump) immunity via 62V absolute max rating. | Use Scenario: Supplying wireless sensor nodes (LoRaWAN/NB-IoT) deployed in remote locations with primary 24V DC or solar-charged battery input. IC Role / Device Role / Timing Role: Main DC-DC converter providing regulated 3.3V to MCU, RF IC, and analog front-end with minimal self-consumption. Use Value: Achieves 2.5µA IQ to extend 24V/10Ah battery life beyond 10 years in sleep mode - validated by typical efficiency curves at 10µA load. |
| Railway Onboard Telematics Unit | Medical Portable Diagnostic Device |
Use Scenario: Converting 72V nominal railway battery (range 40–120V) to 3.3V for GPS, cellular modem, and data logger in harsh vibration environments. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with integrated diodes and FMEA-safe MSOP package for reliability under shock and extended temperature cycling. Use Value: Eliminates external diodes and reduces thermal stress via θJA=40°C/W - sustains 350mA output at 70°C ambient without derating. | Use Scenario: Powering portable ultrasound or glucose monitor with rechargeable Li-ion battery (3.0–4.2V) and backup supercapacitor (up to 5.5V) requiring clean, low-noise 3.3V rail. IC Role / Device Role / Timing Role: Primary step-down regulator supporting both battery and supercapacitor inputs with seamless switchover and low EMI. Use Value: <5mVP-P ripple in Burst Mode prevents interference with sensitive analog signal chains - confirmed by G01/G02 efficiency plots and G28 waveform data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMS#TRPBF | 40V max input, 300mA output, 1.2µA IQ, no integrated diodes - requires external Schottky diode. | Lower input voltage range and reduced current capability limit use in 48V industrial or automotive systems. | Select only if input stays below 40V and board space allows external diode; not suitable for 62V transients. |
| TPS54331DR | 28V max input, 3A output, 4.5µA IQ, external diode, SOIC-8 package - higher current but lower voltage rating and larger footprint. | Cannot withstand automotive load dump or 48V industrial surges; lacks AEC-Q100 qualification. | Choose for high-current, low-voltage applications where 62V robustness is unnecessary and cost is prioritized over qualification. |
Compared with LTC3630EMS#TRPBF and TPS54331DR, the LT3990EMSE-3.3#TRPBF uniquely combines 62V input tolerance, integrated diodes, AEC-Q100 qualification, and sub-3µA quiescent current in a compact MSOP - making it the only viable option for space-constrained, high-reliability 12V/24V/48V automotive and industrial regulators.
Availability
LT3990EMSE-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial IoT sensor nodes, railway telematics units, and medical portable diagnostic devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT3990EMSE-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 semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3990 family was designed specifically for high-input-voltage, ultra-low-quiescent-current DC-DC conversion in automotive and industrial environments - emphasizing fault tolerance, wide temperature operation, and integration of critical passive components.
FAQ
What is the guaranteed output voltage accuracy of the LT3990EMSE-3.3#TRPBF over temperature?
The LT3990EMSE-3.3#TRPBF guarantees 3.3V output with ±1.2% accuracy over the full –40°C to 125°C operating junction temperature range, as specified in the Electrical Characteristics table (page 3, "LT3990-3.3 Output Voltage" row). This is achieved via factory-trimmed internal feedback resistors and validated across production lots - no external calibration is needed. The LT3990EMSE-3.3#TRPBF maintains this accuracy without drift up to 125°C ambient when used with proper PCB thermal design.
Does the LT3990EMSE-3.3#TRPBF require an external feedback resistor network?
No, the LT3990EMSE-3.3#TRPBF does not require external feedback resistors. It is a fixed-output variant with internal precision resistors programmed for 3.3V regulation - Pins 1 and 2 are labeled VOUT and connect directly to the output rail. This eliminates resistor tolerance errors, layout sensitivity, and BOM cost. The LT3990EMSE-3.3#TRPBF achieves its specified ±1.2% accuracy solely through on-die trimming, as confirmed in the datasheet's Electrical Characteristics section.
What is the minimum input voltage required for the LT3990EMSE-3.3#TRPBF to regulate 3.3V output?
The LT3990EMSE-3.3#TRPBF requires a minimum input voltage of 4.2V to operate and regulate 3.3V output, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 4.2V, the internal circuitry cannot sustain regulation - the EN/UVLO threshold becomes invalid, and the part enters shutdown. This 4.2V minimum enables compatibility with deeply discharged 12V lead-acid batteries while ensuring stable startup after cold cranking.
How does the LT3990EMSE-3.3#TRPBF achieve its 2.5µA quiescent current specification?
The LT3990EMSE-3.3#TRPBF achieves 2.5µA quiescent current at 12VIN→3.3VOUT through optimized bipolar process design, low-leakage internal transistors, and intelligent Burst Mode operation that shuts down all non-essential circuitry between energy bursts. This value is measured under defined conditions (TA = 25°C, VEN/UVLO = 12V) and confirmed in the Electrical Characteristics table (page 3). The LT3990EMSE-3.3#TRPBF maintains ultra-low IQ without compromising startup time or regulation accuracy.
Is the LT3990EMSE-3.3#TRPBF pin-compatible with other variants in the LT3990 family?
Yes, the LT3990EMSE-3.3#TRPBF shares identical pinout and package (16-pin MSOP) with all other LT3990EMSE-x variants (e.g., LT3990EMSE-5#TRPBF) and LT3990IMSE/HMSE variants. Pin functions - including dual VOUT pins (1&2), dual GND pins (4,5,8,17), and NC pins (3,5,7,10,12,15) - are electrically and mechanically identical. This allows drop-in replacement across output voltages and temperature grades without PCB redesign - confirmed by the Pin Configuration diagram (page 2) and Order Information table (page 2).
LT3990EMSE-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3990EMSE-3.3#TRPBF FAQ
1.How can I place an order for LT3990EMSE-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990EMSE-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 LT3990EMSE-3.3#TRPBF reliable?
The price and inventory of LT3990EMSE-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 LT3990EMSE-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3990EMSE-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990EMSE-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990EMSE-3.3#TRPBF?
LT3990EMSE-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990EMSE-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 LT3990EMSE-3.3#TRPBF?
For technical support, including LT3990EMSE-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990EMSE-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3990EMSE-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3990EMSE-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 LT3990EMSE-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3990EMSE-3.3#TRPBF?
All LT3990EMSE-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990EMSE-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 LT3990EMSE-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3990EMSE-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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