My Inquiry
My Account
Analog Devices Inc. LT3990EMSE-5#PBF
- Part No.:
- LT3990EMSE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990EMSE-5#PBF.pdf
- Description:
- IC REG BUCK 5V 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,839
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3990EMSE-5#PBF from Analog Devices is a 62V input, 350mA fixed-output 5V monolithic buck switching regulator with integrated boost and catch diodes, 2.5µA quiescent current at 12VIN, low-ripple Burst Mode operation (<5mVP-P), and programmable undervoltage lockout. It delivers regulated 5V power in automotive battery regulation and industrial supply applications where wide VIN range and ultra-low IQ are critical.
For engineers reviewing the LT3990EMSE-5#PBF datasheet, LT3990EMSE-5#PBF pinout, LT3990EMSE-5#PBF application, or LT3990EMSE-5#PBF equivalent, key selection criteria include its 5V fixed output, 16-pin MSOP thermal performance (θJA = 40°C/W), FMEA fault-tolerant pin architecture, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3990EMSE-5#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, integrated boost and catch Schottky diodes, and 1.21V reference enable stable 5V regulation across 4.2V–62V input while maintaining fast transient response and loop stability.
Burst Mode operation reduces input current to 1.8µA at light loads while limiting output ripple to <5mVP-P; the power good (PG) flag asserts when VOUT reaches 90% of 5V, and the EN/UVLO pin provides accurate 1.19V threshold with 35mV hysteresis for reliable startup control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% over –40°C to 125°C; enables direct replacement of LDOs in 5V rail generation without feedback divider. |
| Input Voltage Range | 4.2V to 62V operating; supports 12V/24V/48V automotive and industrial bus inputs with margin for transients. |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT; sustains >1-year battery life in always-on vehicle modules. |
| Switching Frequency | Programmable 200kHz–2.2MHz via RT pin; allows optimization of inductor size (e.g., 33µH at 400kHz) vs. efficiency trade-off. |
| Output Current | 350mA continuous; limited by 450mA catch diode valley current and 700mA switch peak current. |
| Thermal Package | 16-pin MSOP with exposed pad (θJA = 40°C/W); enables 350mA operation at 125°C ambient with minimal heatsinking. |
| Power Good Flag | Open-drain PG asserts high when VOUT ≥ 4.5V; provides system-level power sequencing and fault detection. |
Pinout & Package
LT3990EMSE-5#PBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND). The package is thermally enhanced (θJA = 40°C/W) and supports AEC-Q100 automotive reliability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 / Pin 2 (FB/VOUT) | Fixed-output feedback node | Internally connected to 5V regulation reference; redundant pins ensure robust connection to output capacitor. |
| Pin 4 (EN/UVLO) | Enable and undervoltage lockout input | Active-high enable with 1.19V threshold and 35mV hysteresis; ties directly to VIN if shutdown not required. |
| Pin 6 (VIN) | Main power input | Supplies internal circuitry and switch; requires local 1–4.7µF ceramic bypass near pin. |
| Pin 8 (GND) | Signal ground | One of multiple GND connections; exposed pad (Pin 17) must be soldered to PCB for thermal and electrical integrity. |
| Pin 9 (SW) | Switch node | Connects to inductor; carries pulsed current up to 700mA peak; layout critical for EMI control. |
| Pin 11 (BOOST) | Bootstrap drive voltage | Requires external capacitor to generate >VIN voltage for full NPN switch saturation; max 75V rating. |
| Pin 13 (BD) | Boost diode anode | Connects to boost diode cathode; supplies bias current to internal regulator when >3.2V (e.g., from VOUT). |
| Pin 14 (PG) | Power good open-drain output | Sinks current when VOUT < 4.5V; requires external pull-up for system monitoring. |
| Pin 16 (RT) | Frequency setting | Resistor to GND sets switching frequency; e.g., 374kΩ yields 400kHz per datasheet Table 1. |
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 telematics. |
| FMEA Fault Tolerance | Output remains ≤5V during adjacent pin shorts or floating NC pins (Pins 3/5/7/10/12/15), meeting ASIL-B functional safety requirements. |
| Integrated Diodes | On-die boost and catch Schottky diodes eliminate 2 external components, reduce board area by >30%, and improve reliability. |
| AEC-Q100 Qualified | Rated for –40°C to 125°C operation with automotive-grade process controls; qualified per Grade 1 temperature requirements. |
| Accurate UVLO | Programmable 1.19V EN/UVLO threshold with 35mV hysteresis ensures clean startup across battery voltage sag and cold-crank conditions. |
Applications
| Automotive Battery Regulation | Industrial Power Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery 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 regulator providing isolated 5V rail with fault-tolerant operation and power-good signaling. Use Value: Eliminates need for external TVS and discrete diodes; 2.5µA IQ extends battery backup time during ignition-off states. | Use Scenario: Generating 5V from unregulated 24V or 48V factory automation DC bus for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Fixed-output buck controller delivering 350mA with integrated diodes and thermal robustness in convection-cooled enclosures. Use Value: Reduces BOM count by two diodes and simplifies layout; MSOP package enables compact 2-layer PCB designs. |
| Portable Medical Device Power | Smart Sensor Node Supply |
Use Scenario: Powering handheld ultrasound or glucose monitors from single-cell Li-ion (3.0–4.2V) or dual-cell packs (6–8.4V) with tight ripple and long standby life. IC Role / Device Role / Timing Role: Efficient 5V converter operating in Burst Mode during sleep cycles, with PG flag enabling wake-up coordination. Use Value: 1.8µA light-load IQ extends battery life beyond 12 months; integrated diodes prevent reverse-current leakage. | Use Scenario: Providing regulated 5V to LoRaWAN or NB-IoT sensor nodes powered by energy harvesters or coin cells with highly variable input voltage. IC Role / Device Role / Timing Role: Wide-input buck regulator supporting intermittent 5–60V input bursts while maintaining precise 5V output for RF ICs and ADCs. Use Value: 62V absolute max rating tolerates energy-harvester voltage spikes; low dropout capability enables operation down to 4.2V input. |
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 |
|---|---|---|---|
| LT8609SIV#PBF | 42V max VIN, 2.5A output, synchronous rectification, 2.5µA IQ; no integrated catch diode (external required). | Higher current, lower IQ at light loads, but requires external diode and larger inductor for same 5V/350mA output. | Select LT8609SIV#PBF only if >500mA output or synchronous efficiency >95% is required; LT3990EMSE-5#PBF offers simpler BOM and smaller footprint. |
| TPS54302DDAR | 28V max VIN, 3A output, 28µA IQ, external diode; no FMEA fault tolerance or AEC-Q100 qualification. | Not suitable for automotive or 48V industrial inputs; higher IQ reduces battery life in always-on systems. | Choose TPS54302DDAR for cost-sensitive non-automotive 24V systems where 28µA IQ is acceptable and external diode placement is feasible. |
Compared with LT8609SIV#PBF and TPS54302DDAR, the LT3990EMSE-5#PBF uniquely combines 62V input, integrated diodes, AEC-Q100 qualification, and sub-3µA IQ in a 3×4mm MSOP-making it optimal for space-constrained, high-reliability 5V rails where BOM reduction and automotive compliance are mandatory.
Availability
LT3990EMSE-5#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and portable medical device applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3990EMSE-5#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 automotive, industrial, and communications markets with precision, reliability, and innovation.
The LT3990 product line was designed specifically for high-input-voltage, low-quiescent-current DC/DC conversion in harsh environments-emphasizing integrated diodes, FMEA-safe operation, and AEC-Q100 qualification for automotive and industrial edge applications.
FAQ
What is the output voltage tolerance of the LT3990EMSE-5#PBF over temperature?
The LT3990EMSE-5#PBF delivers 5.0V output with ±1.2% tolerance across the full –40°C to 125°C junction temperature range, as specified in the Electrical Characteristics table (min 4.94V, max 5.06V at 25°C; min 4.90V, max 5.10V over full range). This stability is achieved via laser-trimmed internal feedback resistors and a 1.21V reference with <±10ppm/°C drift.
Does the LT3990EMSE-5#PBF require an external feedback resistor divider?
No, the LT3990EMSE-5#PBF does not require an external feedback resistor divider. As a fixed-output variant, it internally connects Pins 1 and 2 to a precision 5V regulation network; these pins serve as redundant VOUT terminals and must be tied directly to the output capacitor.
What is the maximum achievable switching frequency for the LT3990EMSE-5#PBF at 62V input?
The LT3990EMSE-5#PBF supports up to 2.2MHz switching frequency via the RT pin, but at 62V input the practical maximum is limited by minimum on-time constraints. At 125°C junction temperature, tON(MIN) ≈ 225ns (per Fig. G15), yielding fSW(MAX) ≈ 1.8MHz for reliable operation-higher frequencies risk pulse skipping or regulation loss.
How does the LT3990EMSE-5#PBF handle short-circuit protection?
The LT3990EMSE-5#PBF employs dual-foldback protection: the internal switch current limit (700mA typical) and catch diode valley current limit (450mA typical) both activate during output shorts. This reduces switching frequency and limits average output current to ~200mA, preventing thermal runaway while maintaining regulation during recovery.
Is the LT3990EMSE-5#PBF pin-compatible with other LT3990 variants like LT3990EMSE-3.3#PBF?
Yes, the LT3990EMSE-5#PBF is pin-compatible with LT3990EMSE-3.3#PBF and LT3990EMSE#PBF in the same 16-pin MSOP package. All share identical pinout, thermal pad, and electrical interface; only the internal feedback network differs-requiring no PCB changes when swapping between 3.3V, 5V, or adjustable versions.
LT3990EMSE-5#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:
- 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
LT3990EMSE-5#PBF FAQ
1.How can I place an order for LT3990EMSE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990EMSE-5#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-5#PBF reliable?
The price and inventory of LT3990EMSE-5#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-5#PBF is usually 5 days.
3.What payment methods are accepted for LT3990EMSE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990EMSE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990EMSE-5#PBF?
LT3990EMSE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990EMSE-5#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-5#PBF?
For technical support, including LT3990EMSE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990EMSE-5#PBF requirements.
6.How does Aetrix verify that LT3990EMSE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3990EMSE-5#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-5#PBF meets industry standards.
7.What is the process for return or replacement of LT3990EMSE-5#PBF?
All LT3990EMSE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990EMSE-5#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-5#PBF part is unused and in its original packaging.
Return procedure for LT3990EMSE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3990EMSE-5#PBF 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…
