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Analog Devices Inc. LT3990IMSE#TRPBF
- Part No.:
- LT3990IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,280
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Product details
Overview
LT3990IMSE#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 to 3.3VOUT, low-ripple Burst Mode operation (<5mVP-P), and programmable undervoltage lockout (1.19V threshold). It delivers regulated 5V output in fixed-voltage configuration and is used in automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3990IMSE#TRPBF datasheet, LT3990IMSE#TRPBF pinout, LT3990IMSE#TRPBF application, or LT3990IMSE#TRPBF equivalent, key selection criteria include its 16-pin MSOP thermal performance (θJA = 40°C/W), FMEA fault-tolerant pin behavior during adjacent short or floating conditions, and compatibility with 200kHz–2.2MHz external frequency programming via RT resistor.
Technical Context
The LT3990IMSE#TRPBF implements constant-frequency current-mode control with internal slope compensation, enabling fast transient response and stable loop behavior across wide input ranges. Its bipolar NPN main switch is driven by an integrated charge pump (BOOST pin), requiring external capacitor biasing to exceed VIN by ≥30V for full saturation.
Burst Mode operation reduces quiescent current to 1.8µA at light loads while maintaining <5mVP-P output ripple; the power-good flag (PG) asserts when FB reaches 90% of regulation voltage, and catch diode current limiting (450mA typical) provides fault protection during shorted-output events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 62V - supports direct connection to 48V industrial rails and automotive batteries without pre-regulation. |
| Output Current | 350mA - maximum continuous load under thermal limits in MSOP package at TJ ≤ 125°C. |
| Quiescent Current | 2.5µA at 12VIN/3.3VOUT - enables always-on systems with multi-year battery life in portable applications. |
| Switching Frequency | 200kHz to 2.2MHz - set externally via RT-to-GND resistor; higher frequencies allow smaller magnetics but reduce max VIN/VOUT ratio. |
| Feedback Voltage | 1.21V ±1.25% - precise internal reference enabling accurate output regulation across temperature (–40°C to 125°C). |
| Power Good Threshold | 90% of regulated output - open-drain PG pin signals valid regulation only when EN/UVLO is high and VIN > 4.2V. |
| Catch Diode Limit | 450mA valley current - protects against overcurrent faults without external sensing components. |
Pinout & Package
LT3990IMSE#TRPBF uses a 16-lead plastic MSOP package with exposed thermal 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 input | Regulates to 1.21V; dual pins provide redundant path for feedback divider-tie both to divider tap. |
| EN/UVLO (Pin 4) | Enable / UVLO input | Active-high enable with 1.19V threshold and 35mV hysteresis; shutdown draws only 0.7µA. |
| VIN (Pin 6) | Main power input | Supplies internal circuitry and switch; requires local ceramic bypass (≥1µF X7R). |
| GND (Pins 8,17) | Ground reference | Multiple ground connections including exposed thermal pad-must be soldered to PCB plane. |
| SW (Pin 9) | Switch node | Connects to inductor; carries high di/dt switching current-requires tight layout to minimize EMI. |
| BOOST (Pin 11) | Charge pump drive | Bias voltage ≥30V above SW required to fully saturate internal bipolar NPN switch. |
| BD (Pin 13) | Boost diode anode | Supplies internal regulator when >3.2V; improves efficiency by sourcing bias from VOUT instead of VIN. |
| PG (Pin 14) | Power good flag | Open-drain output active-low until FB reaches 90% of target; valid only if VIN > 4.2V and EN high. |
| RT (Pin 16) | Frequency programming | Resistor to GND sets switching frequency from 200kHz to 2.2MHz per documented RT table. |
Key Features
| Feature | Design Value |
|---|---|
| Low Ripple Burst Mode | Maintains <5mVP-P output ripple at light loads while reducing IQ to 1.8µA-critical for battery-powered instrumentation. |
| FMEA Fault Tolerance | Output remains at or below regulation voltage during adjacent pin shorts or floating NC pins-meets automotive functional safety expectations. |
| Integrated Diodes | On-die boost and catch Schottky diodes eliminate four external components and reduce board area by >30% vs discrete solutions. |
| AEC-Q100 Qualified | Rated for –40°C to 125°C operation with guaranteed performance-validated for automotive battery regulation and ADAS power domains. |
| Accurate UVLO | Programmable 1.19V EN/UVLO threshold with 35mV hysteresis ensures clean startup and brownout recovery in noisy vehicle electrical systems. |
Applications
| Automotive Battery Regulation | Industrial 24V/48V Power Supply |
|---|---|
Use Scenario: Regulating raw vehicle battery (9V–62V transients) to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, fault-protected 5V rail with power-good signaling for system sequencing. Use Value: Eliminates need for external TVS and pre-regulator stages; FMEA tolerance prevents latch-up during jump-start or load-dump events. | Use Scenario: Converting 48V factory automation bus to 5V for PLC I/O modules and sensor interfaces operating in harsh EMI environments. IC Role / Device Role / Timing Role: High-input-voltage DC/DC controller delivering regulated 5V with low-noise Burst Mode operation for analog front-ends. Use Value: 2.5µA quiescent current enables energy harvesting-compatible standby modes; integrated diodes reduce BOM count and thermal stress. |
| Portable Medical Instrumentation | Ruggedized IoT Edge Node |
Use Scenario: Powering handheld ultrasound or glucose meters from single Li-ion (3.0V–4.2V) or two-cell packs (6V–8.4V) with ultra-low standby drain. IC Role / Device Role / Timing Role: Efficient step-down regulator supporting always-on monitoring functions with precise 5V output for ADC references and RF ICs. Use Value: 1.8µA Burst Mode IQ extends battery life beyond 5 years in sleep mode; small MSOP footprint fits compact enclosures. | Use Scenario: Providing 5V to LoRaWAN gateways deployed in remote infrastructure with wide ambient temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade buck converter delivering robust 5V supply with thermal derating up to 125°C junction temperature. Use Value: AEC-Q100 qualification ensures reliability in uncontrolled environments; PG flag enables firmware-controlled power sequencing and fault logging. |
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#PBF | 40V max input, 500mA output, no integrated catch diode, 12µA IQ | Lower voltage range; requires external Schottky; better for space-constrained 24V-only systems | Select when input never exceeds 40V and higher output current justifies added diode BOM cost. |
| MAX20004AATP+T | 65V max input, 350mA, 2.5µA IQ, no integrated boost diode, different pinout | Same input range and IQ; lacks BOOST diode integration-requires external bootstrap circuit | Choose when design already includes external high-side driver and needs pin-compatible upgrade path from legacy MAX parts. |
Compared with LTC3639EMSE#PBF and MAX20004AATP+T, LT3990IMSE#TRPBF uniquely integrates both boost and catch diodes in a thermally enhanced MSOP, enabling lowest component count and highest reliability in 48V/automotive applications where board space and fault resilience are critical.
Availability
LT3990IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 48V power supplies, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3990IMSE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, 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 where reliability under voltage transients and thermal stress is mandatory.
FAQ
What is the maximum input voltage rating for LT3990IMSE#TRPBF?
The absolute maximum input voltage for LT3990IMSE#TRPBF is 62V on the VIN pin and 75V on the BOOST pin. Operation above 62V on VIN risks permanent damage, though brief transients up to the absolute maximum may be tolerated if within energy limits defined by external clamping. The device regulates correctly across its full 4.2V–62V operating range, with minimum input determined by duty cycle constraints at high switching frequencies.
Does LT3990IMSE#TRPBF require external diodes?
No, LT3990IMSE#TRPBF integrates both the boost diode and catch Schottky diode on-die, eliminating four external components typically needed in discrete buck designs. This integration reduces PCB area, improves thermal performance, and enhances reliability by removing solder joint failure points-confirmed in the datasheet's "Integrated Boost and Catch Diodes" feature list and block diagram.
What is the purpose of the BD pin on LT3990IMSE#TRPBF?
The BD pin on LT3990IMSE#TRPBF connects to the anode of the internal boost diode and serves a dual role: it supplies current to the internal bias regulator when held above 3.2V (e.g., tied to VOUT), improving efficiency by offloading bias current from VIN; and it enables the internal regulator to operate independently of VIN during startup or brownout. This functionality is explicitly detailed in the Pin Functions section and Applications Information.
How does LT3990IMSE#TRPBF achieve low output ripple in Burst Mode?
LT3990IMSE#TRPBF achieves <5mVP-P output ripple in Burst Mode by delivering precisely timed, low-energy switching bursts that replenish output capacitor charge without sustaining continuous oscillation. The control architecture minimizes switching losses between bursts and maintains tight regulation via the 1.21V reference and error amplifier-verified in Typical Performance Characteristics Figure G01–G02 and the Low Ripple Burst Mode section of the datasheet.
Is LT3990IMSE#TRPBF pin-compatible with other variants in the LT3990 family?
Yes, LT3990IMSE#TRPBF shares identical pinout and package (16-lead MSOP) with all other LT3990-X IMSE variants (e.g., LT3990IMSE-3.3#TRPBF, LT3990IMSE-5#TRPBF), differing only in internal feedback network configuration. The FB/VOUT pin assignment and NC pin locations are consistent across the family, enabling drop-in replacement for different output voltages without PCB redesign-confirmed in the Pin Configuration diagram and Order Information table.
LT3990IMSE#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:
- 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
LT3990IMSE#TRPBF FAQ
1.How can I place an order for LT3990IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990IMSE#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 LT3990IMSE#TRPBF reliable?
The price and inventory of LT3990IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3990IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3990IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990IMSE#TRPBF?
LT3990IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990IMSE#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 LT3990IMSE#TRPBF?
For technical support, including LT3990IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3990IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3990IMSE#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 LT3990IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3990IMSE#TRPBF?
All LT3990IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990IMSE#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 LT3990IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3990IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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