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Analog Devices Inc. LT3990EMSE#PBF
- Part No.:
- LT3990EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,241
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Product details
Overview
LT3990EMSE#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 (1.19V threshold). It serves as a primary DC/DC power stage in automotive battery regulation and industrial supplies where wide input range and ultra-low IQ are critical.
For engineers reviewing the LT3990EMSE#PBF datasheet, LT3990EMSE#PBF pinout, LT3990EMSE#PBF application, or LT3990EMSE#PBF equivalent, key selection criteria include its 16-pin MSOP thermal performance (θJA = 40°C/W), FMEA-fault-tolerant pin architecture, 200kHz–2.2MHz adjustable switching frequency, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3990EMSE#PBF implements constant-frequency current-mode control with internal bipolar NPN switch, integrated Schottky boost and catch diodes, and dual current limiting (switch peak: 700mA typ; catch valley: 450mA typ). Its error amplifier regulates FB to 1.21V (or VOUT directly for fixed-output variants) and drives VC to modulate duty cycle via slope compensation.
Burst Mode operation disables non-essential circuitry between switching bursts to achieve 1.8µA no-load IQ, while maintaining output ripple <5mVP-P. The power good (PG) flag asserts when FB reaches 90% of regulation voltage, and EN/UVLO provides accurate 1.19V rising threshold with 35mV hysteresis-valid only when VIN ≥ 4.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 62V - supports direct connection to 48V industrial buses and 12V/24V automotive batteries with headroom for transients. |
| Output Current | 350mA - maximum continuous load capability limited by thermal design and internal current limits (switch: 700mA peak, catch diode: 450mA valley). |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables always-on systems like telematics and sensor nodes with multi-year battery life. |
| Switching Frequency | 200kHz to 2.2MHz - set by external RT resistor; higher frequencies allow smaller magnetics but reduce max VIN/VOUT ratio due to min on-time constraints. |
| Feedback Voltage | 1.21V ±1.25% - precise reference enabling accurate output regulation across temperature (–40°C to 125°C). |
| Power Good Threshold | 90% of regulated output - open-drain PG signal confirms stable regulation before system enable, with 10% hysteresis. |
| Shutdown Current | 0.7µA - ultra-low leakage during disable, critical for energy harvesting and backup power applications. |
Pinout & Package
LT3990EMSE#PBF uses a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17) soldered to PCB for optimal thermal performance (θJA = 40°C/W, θJC = 10°C/W). Pin functions are validated per Analog Devices datasheet revision 3990b.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pins 1, 2) | Feedback input | Regulates to 1.21V; dual pins provide redundant path for feedback divider-tie both to divider tap for robustness. |
| EN/UVLO (Pin 4) | Enable / UVLO input | Active-high enable with 1.19V rising threshold and 35mV hysteresis; must be ≥4.2V on VIN to guarantee accuracy. |
| 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) | Ground reference | Exposed pad (Pin 17) is GND and must be soldered to PCB copper for thermal and electrical integrity. |
| SW (Pin 9) | Switch node | Connects to inductor; carries high dI/dt switching current-requires short, low-inductance trace to minimize EMI. |
| BOOST (Pin 11) | Bootstrap drive | Drives internal NPN switch base above VIN; requires external capacitor from BOOST to SW for proper saturation. |
| BD (Pin 13) | Boost diode anode | Connects to external boost diode anode; also powers internal bias regulator when >3.2V (e.g., tied to VOUT). |
| PG (Pin 14) | Power good flag | Open-drain output active-low until FB reaches 90% of regulation; requires external pull-up for logic-level signaling. |
| RT (Pin 16) | Frequency set | Resistor to GND sets switching frequency (200kHz–2.2MHz); value selected per Table 1 in datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA Fault Tolerance | MSOP package maintains output ≤ regulation voltage during adjacent pin shorts or floating pins-critical for automotive safety-critical subsystems. |
| Low Ripple Burst Mode | Maintains <5mVP-P output ripple at light loads while reducing IQ to 1.8µA-enables clean power for RF and precision analog circuits. |
| Integrated Diodes | On-die boost and catch Schottky diodes eliminate 2 external components, reduce board area, and improve reliability over discrete solutions. |
| AEC-Q100 Qualified | Rated for automotive applications (Grade E, –40°C to +125°C junction)-qualified per stress test requirements for automotive electronics. |
| Accurate Programmable UVLO | 1.19V ±50mV EN/UVLO threshold with 35mV hysteresis enables precise brown-out protection without external comparators. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12V/24V/48V vehicle battery rails to 3.3V or 5V for infotainment, ADAS sensors, and body control modules. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, low-noise, fault-tolerant power with AEC-Q100 compliance. Use Value: Withstands cold-crank (4.2V) and load-dump (62V) transients while maintaining 2.5µA quiescent current for always-on functionality. | Use Scenario: Powering PLC I/O modules, field transmitters, and industrial HMIs operating from unregulated 24V DC or 48V PoE-derived supplies. IC Role / Device Role / Timing Role: High-input-voltage DC/DC front-end delivering stable 3.3V/5V outputs in space-constrained enclosures. Use Value: Integrated diodes and 16-pin MSOP reduce BOM count and footprint; thermal performance supports convection-cooled designs up to 125°C ambient. |
| Portable Product Power | Connected Device Power |
Use Scenario: Power management in handheld test equipment, portable medical monitors, and ruggedized data loggers using Li-ion or alkaline battery packs. IC Role / Device Role / Timing Role: Efficient step-down regulator extending battery life via ultra-low IQ and Burst Mode operation. Use Value: 2.5µA IQ at 12V→3.3V enables multi-year operation on coin cells; programmable UVLO prevents deep discharge damage. | Use Scenario: Powering Wi-Fi/BLE modules, cellular IoT gateways, and smart sensors in edge infrastructure requiring long-term reliability. IC Role / Device Role / Timing Role: Robust, low-EMI DC/DC converter supporting always-on connectivity with fast transient response. Use Value: Current-mode control delivers <10µs load transient recovery; low-ripple Burst Mode avoids audible ceramic capacitor noise in sensitive RF environments. |
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 | 40V max input, 150mA output, 17µA IQ, no integrated diodes - requires external Schottky diodes. | Lower power, lower voltage systems; lacks AEC-Q100 rating and FMEA fault tolerance. | Select when input voltage ≤40V and cost-sensitive designs prioritize smaller package (10-lead MSOP) over integration. |
| LM5164QPWPRQ1 | 100V max input, 350mA output, 13µA IQ, integrated high-side MOSFET only - requires external bootstrap and catch diodes. | Higher input voltage capability; not qualified to AEC-Q100 Grade 1 (–40°C to +125°C) - rated Grade 0 (–40°C to +150°C). | Select for 60–100V industrial inputs where extended temperature range outweighs need for integrated diodes and ultra-low IQ. |
Compared with LTC3631EMSE#PBF and LM5164QPWPRQ1, LT3990EMSE#PBF uniquely combines 62V input, integrated boost/catch diodes, 2.5µA IQ, AEC-Q100 qualification, and FMEA fault tolerance in a single 16-pin MSOP-making it optimal for automotive and high-reliability industrial buck conversion where component count, efficiency, and safety are jointly constrained.
Availability
LT3990EMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and portable product power requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3990EMSE#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 ICs, serving industrial, automotive, communications, and healthcare markets.
The LT3990 product line was designed specifically for high-input-voltage, low-quiescent-current DC/DC conversion in automotive and industrial environments-emphasizing fault tolerance, wide VIN range, and integrated power stages.
FAQ
What is the absolute maximum input voltage rating for LT3990EMSE#PBF?
The absolute maximum input voltage for LT3990EMSE#PBF is 62V on the VIN pin and 75V on the BOOST pin. Exceeding these ratings may cause permanent damage. During normal operation, the maximum functional input voltage depends on switching frequency and minimum on-time constraints-calculated as VIN(OP-MAX) = (VOUT + VD)/(fSW × tON(MIN)) − VD + VSW, where VD ≈ 0.7V and VSW ≈ 0.5V.
Does LT3990EMSE#PBF require external diodes for operation?
No, LT3990EMSE#PBF integrates both the boost diode and catch diode on-die, eliminating the need for external diodes. This reduces BOM count, PCB area, and potential failure points. The internal Schottky diodes are characterized with forward voltages of 900mV (boost) and 725mV (catch) at specified currents, and reverse leakage <2µA.
How does the power good (PG) flag behave on LT3990EMSE#PBF?
The PG pin on LT3990EMSE#PBF is an open-drain output that remains low until the FB pin reaches 90% of its regulated voltage (e.g., 1.089V for 1.21V reference). PG is valid only when VIN > 4.2V and EN/UVLO is high. It sinks up to 80µA when active and requires an external pull-up resistor to generate a logic-high signal for system monitoring.
Can LT3990EMSE#PBF operate in Burst Mode with fixed output voltage variants like LT3990EMSE-5#PBF?
Yes, LT3990EMSE#PBF and all fixed-output variants (e.g., LT3990EMSE-5#PBF) support Low Ripple Burst Mode operation across the full load range. In this mode, the regulator delivers energy in controlled bursts to maintain output regulation while reducing quiescent current to 1.8µA and keeping output ripple below 5mVP-P-regardless of whether feedback is taken from FB or the internal VOUT pin.
What thermal considerations apply to LT3990EMSE#PBF in the 16-pin MSOP package?
LT3990EMSE#PBF in the 16-pin MSOP package has θJA = 40°C/W and θJC = 10°C/W. The exposed pad (Pin 17) must be soldered to a thermal pad on the PCB to achieve these ratings. For continuous 350mA output at high ambient temperatures, a minimum 200mm² copper pour connected to the exposed pad is recommended to maintain junction temperature ≤125°C.
LT3990EMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3990EMSE#PBF FAQ
1.How can I place an order for LT3990EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990EMSE#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 LT3990EMSE#PBF reliable?
The price and inventory of LT3990EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3990EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3990EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990EMSE#PBF?
LT3990EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990EMSE#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 LT3990EMSE#PBF?
For technical support, including LT3990EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990EMSE#PBF requirements.
6.How does Aetrix verify that LT3990EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3990EMSE#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 LT3990EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3990EMSE#PBF?
All LT3990EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990EMSE#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 LT3990EMSE#PBF part is unused and in its original packaging.
Return procedure for LT3990EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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