My Inquiry
My Account
Analog Devices Inc. LT3990IMSE-5#TRPBF
- Part No.:
- LT3990IMSE-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990IMSE-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,617
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3990IMSE-5#TRPBF from Analog Devices is a 62V input, 350mA fixed 5V output monolithic buck regulator with integrated boost and catch diodes, 2.5µA quiescent current in Burst Mode, <5mVP-P output ripple, and FMEA-fault-tolerant 16-pin MSOP package-designed for automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3990IMSE-5#TRPBF datasheet, LT3990IMSE-5#TRPBF pinout, LT3990IMSE-5#TRPBF application, or LT3990IMSE-5#TRPBF equivalent, key selection criteria include its 5V fixed output, 4.2V–62V input range, 0.7µA shutdown current, AEC-Q100 qualification, and thermally enhanced MSOP package with exposed ground pad.
Technical Context
The LT3990IMSE-5#TRPBF implements constant-frequency current-mode control with programmable switching frequency (200kHz–2.2MHz via RT resistor), internal bipolar NPN switch with 210mV VCE(SAT) at 200mA, and dual current limiting: 700mA peak switch limit and 450mA valley catch diode limit. It uses low-ripple Burst Mode operation to maintain regulation while holding IQ ≤ 2.5µA at light loads.
Its fault-tolerant architecture includes accurate programmable undervoltage lockout (1.19V threshold, 35mV hysteresis), open-drain power good flag (90% VOUT threshold), and internal sense-based catch diode current protection-ensuring safe operation during shorted outputs or adjacent pin shorts in the MSOP package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 62V - supports wide automotive and industrial supply rails without external pre-regulation |
| Output Voltage | Fixed 5.00V ±1.2% - factory-trimmed; no external feedback resistors required |
| Max Output Current | 350mA continuous - limited by thermal design and 450mA catch diode valley current clamp |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT - enables always-on systems with multi-year battery life |
| Switching Frequency | 200kHz to 2.2MHz - set externally via RT-to-GND resistor; enables optimization of size vs. efficiency |
| Shutdown Current | 0.7µA - ensures minimal drain during system sleep or disable states |
| Power Good Threshold | 90% of VOUT (i.e., 4.5V) - provides reliable enable signaling for downstream logic or sequencing |
Pinout & Package
LT3990IMSE-5#TRPBF is housed in a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND), θJA = 40°C/W, θJC = 10°C/W. The package supports AEC-Q100 Grade I (–40°C to +125°C) operation and features FMEA-compliant pin layout with redundant FB/VOUT pins and NC pins for fault tolerance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 & 2 (VOUT) | Fixed-output voltage reference node | Internally connected; ties to internal 5V feedback divider-must connect both to output for redundancy and fault tolerance |
| Pin 4 (EN/UVLO) | Enable and undervoltage lockout input | Active-high enable with 1.19V rising threshold and 35mV hysteresis; disables regulator below 4.2V VIN |
| Pin 6 (VIN) | Main power input | Supplies internal circuitry and switch; requires local ceramic bypass (≥1µF X7R) |
| Pin 8 & 17 (GND) | Power and signal ground | Exposed pad (Pin 17) must be soldered to PCB ground plane for thermal and electrical integrity |
| Pin 9 (SW) | Switch node | Drives external inductor; connects to internal bipolar NPN switch collector |
| Pin 11 (BOOST) | Bootstrap drive voltage source | Provides >VIN voltage to fully saturate internal switch; requires external capacitor to SW |
| Pin 13 (BD) | Boost diode anode connection | Connects to external boost diode anode; also powers internal bias regulator when >3.2V |
| Pin 14 (PG) | Open-drain power good flag | Asserts high (via external pull-up) when VOUT reaches 90% of 5V; valid only if VIN > 4.2V and EN high |
| Pin 16 (RT) | Frequency programming input | Resistor to GND sets switching frequency from 200kHz to 2.2MHz per Table 1 in datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Low-ripple Burst Mode® operation | Maintains <5mVP-P output ripple at light loads while reducing IQ to 2.5µA-critical for battery-powered instrumentation |
| FMEA-fault-tolerant MSOP package | NC pins (3,5,7,10,12,15) are unconnected internally; floating them prevents malfunction during adjacent pin shorts or open-circuit faults |
| Integrated boost and catch diodes | Eliminates 2 external Schottky diodes-reducing BOM count, board area, and thermal stress in compact designs |
| AEC-Q100 qualified (Grade I) | Validated for automotive applications including engine control modules and body electronics requiring –40°C to +125°C operation |
| Accurate programmable UVLO | 1.19V threshold with 35mV hysteresis enables precise brown-out detection and clean system reset sequencing |
Applications
| Automotive Battery Regulation | Industrial Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V/48V vehicle battery rails to stable 5V for infotainment microcontrollers and CAN transceivers under cold-crank (4.2V) and load-dump (62V) conditions. IC Role / Device Role / Timing Role: Primary step-down DC/DC converter providing isolated, regulated 5V power with fault protection and low IQ. Use Value: Enables direct battery connection without pre-regulator stages, reduces component count by integrating diodes, and meets AEC-Q100 requirements for automotive reliability. | Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus controllers in factory automation where input voltage varies from 12V to 48V DC with high EMI immunity needs. IC Role / Device Role / Timing Role: Fixed-output buck regulator delivering clean 5V at up to 350mA with robust thermal performance in confined enclosures. Use Value: Delivers <5mVP-P ripple in Burst Mode for noise-sensitive analog front-ends, and maintains regulation across wide temperature ranges without derating. |
| Portable Medical Instrumentation | Remote IoT Sensor Node |
Use Scenario: Powering handheld diagnostic devices (e.g., pulse oximeters, glucose meters) operating from single-cell Li-ion (3.0–4.2V) or dual-cell alkaline (2.4–3.6V) with boost-capable input staging. IC Role / Device Role / Timing Role: Input-flexible buck regulator accepting ≥4.2V input (e.g., via charge-pump pre-stage) to deliver precise 5V for MCU and display drivers. Use Value: 0.7µA shutdown current extends battery life in standby; 2.5µA operating IQ enables multi-week runtime on coin cells when paired with low-power MCU sleep modes. | Use Scenario: Supplying 5V to ultra-low-power wireless SoCs (e.g., Nordic nRF52, Silicon Labs EFM32) in solar- or energy-harvesting–powered environmental sensors deployed outdoors. IC Role / Device Role / Timing Role: Primary power conversion stage converting variable harvested voltage (e.g., 8–60V from PV panel or thermoelectric generator) to regulated 5V. Use Value: Wide 4.2–62V input range accommodates fluctuating harvest sources; integrated diodes reduce leakage paths and improve cold-start capability at low input voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE-5#PBF | Same 5V fixed output, but lower 40V max input, higher 10µA IQ, no integrated catch diode, requires external Schottky | Suitable for space-constrained non-automotive apps where 62V rating is unnecessary and external diode layout is acceptable | Select LTC3630EMSE-5#PBF only if input never exceeds 40V and thermal budget allows higher IQ |
| TPS54302DDAR | 5V fixed output, 5.5–28V input, 3A output, no integrated diodes, 25µA IQ, no AEC-Q100 grade | Targeted at higher-current industrial or telecom apps where 350mA is insufficient and external diodes are preferred | Choose TPS54302DDAR only when >1A output is needed and automotive qualification is not required |
Compared with LTC3630EMSE-5#PBF and TPS54302DDAR, LT3990IMSE-5#TRPBF uniquely combines 62V input tolerance, integrated diodes, sub-3µA quiescent current, and AEC-Q100 qualification-making it the only drop-in solution for automotive and harsh-environment 5V point-of-load regulation.
Availability
LT3990IMSE-5#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT3990IMSE-5#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 ICs, serving precision instrumentation, automotive, industrial, and communications markets.
The LT3990 product line delivers high-voltage monolithic buck regulators with integrated diodes and ultra-low quiescent current-designed specifically for automotive, industrial, and battery-powered systems demanding reliability across extreme input voltage transients.
FAQ
What is the maximum input voltage rating for LT3990IMSE-5#TRPBF?
The absolute maximum input voltage for LT3990IMSE-5#TRPBF is 62V on the VIN pin and 75V on the BOOST pin. Operation above 62V on VIN risks permanent damage. During transient overvoltage events (e.g., automotive load dump), the device reduces switching frequency to maintain regulation-but sustained operation beyond 62V violates Absolute Maximum Ratings and voids warranty. Always use input clamping or TVS protection for systems exposed to >62V transients.
Does LT3990IMSE-5#TRPBF require external feedback resistors to set the output voltage?
No, LT3990IMSE-5#TRPBF does not require external feedback resistors. It is a fixed 5V output variant-the internal feedback divider is factory-trimmed to deliver 5.00V ±1.2% across temperature and load. Pins 1 and 2 are labeled VOUT and internally connected to this fixed-ratio network. External resistors would disrupt regulation and are neither needed nor recommended for LT3990IMSE-5#TRPBF.
How does the power good (PG) flag behave on LT3990IMSE-5#TRPBF?
The PG pin on LT3990IMSE-5#TRPBF is an open-drain output that remains low until the VOUT pin reaches 90% of its nominal 5V output (i.e., 4.5V). It becomes valid only when VIN > 4.2V and EN/UVLO is high. An external pull-up resistor (typically 10kΩ to 5V) is required. PG asserts high to signal proper regulation-enabling safe sequencing of downstream processors or peripherals in automotive and industrial systems using LT3990IMSE-5#TRPBF.
Can LT3990IMSE-5#TRPBF operate with input voltages below 4.2V?
No, LT3990IMSE-5#TRPBF cannot regulate with input voltages below 4.2V. Its minimum operating input voltage is 4.2V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Below this, the internal bias circuit fails to start, EN/UVLO threshold becomes invalid, and the device remains in shutdown-even if EN/UVLO is pulled high. For sub-4.2V inputs, a boost pre-regulator stage is required before feeding power to LT3990IMSE-5#TRPBF.
What thermal considerations apply to LT3990IMSE-5#TRPBF in the MSOP package?
LT3990IMSE-5#TRPBF in the 16-lead MSOP package has θJA = 40°C/W and θJC = 10°C/W. To ensure reliable operation at full 350mA load, the exposed thermal pad (Pin 17) must be soldered to a minimum 100mm² copper pour connected to internal/external ground planes. Without adequate thermal relief, junction temperature can exceed 125°C at ambient >85°C-triggering thermal shutdown. Derate output current linearly above 85°C ambient per the thermal curves in the LT3990 datasheet.
LT3990IMSE-5#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):
- 5V
- 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
LT3990IMSE-5#TRPBF FAQ
1.How can I place an order for LT3990IMSE-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990IMSE-5#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-5#TRPBF reliable?
The price and inventory of LT3990IMSE-5#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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3990IMSE-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990IMSE-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990IMSE-5#TRPBF?
LT3990IMSE-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990IMSE-5#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-5#TRPBF?
For technical support, including LT3990IMSE-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990IMSE-5#TRPBF requirements.
6.How does Aetrix verify that LT3990IMSE-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3990IMSE-5#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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3990IMSE-5#TRPBF?
All LT3990IMSE-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990IMSE-5#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-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3990IMSE-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3990IMSE-5#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
