My Inquiry
My Account
Analog Devices Inc. LT3990EDD#PBF
- Part No.:
- LT3990EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3990EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:461
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3990EDD#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 delivers regulated 5V output in a thermally enhanced 10-lead (3mm × 3mm) DFN package for automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3990EDD#PBF datasheet, LT3990EDD#PBF pinout, LT3990EDD#PBF application, or LT3990EDD#PBF equivalent, key selection criteria include its 4.2V–62V input range, 350mA output capability, integrated diode architecture, 0.7µA shutdown current, and AEC-Q100 qualification for automotive use.
Technical Context
The LT3990EDD#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 high-efficiency regulation across wide input ranges.
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 VFB reaches 90% of regulation, and the EN/UVLO pin provides accurate 1.19V threshold with 35mV hysteresis.
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 - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables multi-year battery life in always-on monitoring systems. |
| Switching Frequency | 200kHz to 2.2MHz - allows optimization of inductor size (e.g., 33µH at 400kHz) and EMI profile per application requirements. |
| Output Ripple | <5mVP-P in Burst Mode - meets noise-sensitive analog supply requirements without additional LDO post-regulation. |
| Shutdown Current | 0.7µA - ensures minimal system leakage during deep sleep or fault conditions. |
| Feedback Voltage | 1.21V ±1.25% - enables precise output programming via external resistor divider (e.g., 3.3V or 5V fixed variants). |
Pinout & Package
LT3990EDD#PBF uses a 10-lead (3mm × 3mm) plastic DFN package with exposed thermal pad (Pin 11 = GND). The package supports high-power density and efficient PCB heat dissipation when the exposed pad is soldered to a thermal plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB) | Feedback input | Regulates output by sensing voltage at 1.21V reference; connects to resistor divider tap for adjustable outputs. |
| Pin 2 (PG) | Power good open-drain output | Signals valid regulation (VFB ≥ 90% of target); requires external pull-up for system sequencing or fault detection. |
| Pin 3 (BD) | Boost diode anode | Supplies bias current to internal regulator when >3.2V; improves efficiency by sourcing control power from VOUT. |
| Pin 4 (BOOST) | Bootstrap drive node | Provides >VIN voltage to fully saturate internal bipolar NPN switch; requires external capacitor to SW. |
| Pin 5 (SW) | Switch node | Connects directly to inductor; carries pulsed high-current switching waveform and must be routed with minimal loop area. |
| Pin 6 (FB/VOUT) | Feedback or fixed-output sense | For LT3990EDD#PBF (adjustable version), functions as FB; redundant pin for improved layout robustness. |
| Pin 7 (EN/UVLO) | Enable and undervoltage lockout | Active-high enable with 1.19V threshold and 35mV hysteresis; ties to VIN for always-on operation. |
| Pin 8 (VIN) | Main power input | Supplies internal circuitry and switch driver; requires local 1–4.7µF ceramic bypass capacitor. |
| Pins 9,10,11 (GND) | Ground return paths | Three GND connections including exposed thermal pad (Pin 11); all must be low-impedance and tied to common ground plane. |
| Pin 10 (RT) | Frequency setting | Resistor-to-ground sets switching frequency (e.g., 374kΩ = 400kHz); enables trade-off between size, efficiency, and dropout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates four external components, reduces BOM count and board area, and improves reliability over discrete diode solutions. |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while achieving 1.8µA quiescent current-critical for battery-powered IoT sensors. |
| FMEA-fault-tolerant design | Ensures output remains at or below regulation voltage during adjacent pin shorts or floating pins-required for ASIL-B automotive compliance. |
| AEC-Q100 qualified (Grade E) | Guaranteed operation from –40°C to +125°C junction temperature with full electrical characterization-validates use in engine bay and ADAS modules. |
| Accurate programmable UVLO | 1.19V enable threshold with 35mV hysteresis enables clean start-up sequencing and brown-out protection in noisy vehicle electrical systems. |
Applications
| Automotive Battery Regulation | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Regulating 12V–48V vehicle battery rail to stable 5V for camera modules and radar processors in ADAS systems. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, low-noise 5V supply with PG signaling for safe boot sequencing. Use Value: 62V absolute max rating withstands load dump transients; 0.7µA shutdown current minimizes parasitic drain during vehicle off-state. | Use Scenario: Powering MEMS accelerometers and wireless transceivers in factory-floor condition monitoring nodes. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter enabling multi-year operation from primary lithium thionyl chloride cells. Use Value: 2.5µA quiescent current extends battery life; integrated diodes reduce footprint in compact IP67-rated enclosures. |
| Portable Medical Device Power | Ruggedized Communication Module |
Use Scenario: Generating 3.3V from 9V alkaline or Li-ion sources for handheld pulse oximeters and glucose meters. IC Role / Device Role / Timing Role: Adjustable-output buck regulator delivering low-noise analog supply with tight line/load regulation. Use Value: 1.21V feedback reference enables ±1% output accuracy; <5mVP-P ripple avoids interference with sensitive ADC measurements. | Use Scenario: Providing 5V rail for LTE-M modems and CAN transceivers deployed in outdoor utility metering infrastructure. IC Role / Device Role / Timing Role: Robust front-end regulator handling wide-input industrial power (18–60V DC) with fault protection. Use Value: Catch diode current limit protects against short-circuit faults; thermal DFN package sustains operation at 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE#PBF | 40V max input, 150mA output, no integrated catch diode, higher 12µA IQ | Suitable for lower-power, cost-sensitive industrial controls where 62V rating and 350mA are unnecessary | Select when input voltage ≤40V and load current <150mA; requires external catch diode and increases layout complexity |
| MPQ4420AGL-A-Z | 40V max input, 2A output, integrated MOSFETs, 22µA IQ, no PG or UVLO precision | Better for high-current motor drivers or PLC I/O modules needing >350mA but not automotive qualification | Choose for higher output current and lower RDS(on); lacks AEC-Q100 grade and accurate PG/UVLO needed for safety-critical automotive use |
Compared with LTC3630EMSE#PBF and MPQ4420AGL-A-Z, LT3990EDD#PBF uniquely combines 62V input tolerance, integrated diodes, sub-3µA quiescent current, AEC-Q100 qualification, and precise PG/UVLO-making it optimal for automotive and long-life industrial power where reliability and low standby loss are mandatory.
Availability
LT3990EDD#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor power supplies, and portable medical device power requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3990EDD#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 industrial, automotive, communications, and healthcare markets.
The LT3990 product line was designed specifically for high-input-voltage, low-quiescent-current DC-DC conversion in harsh environments-including automotive infotainment, ADAS, and industrial control systems requiring AEC-Q100 compliance and FMEA-safe operation.
FAQ
What is the maximum input voltage rating for LT3990EDD#PBF?
The LT3990EDD#PBF has an absolute maximum input voltage rating of 62V on the VIN pin and 75V on the BOOST pin. It operates continuously from 4.2V to 62V, making it suitable for 48V industrial systems and 12V/24V automotive applications with load dump protection. Exceeding 62V on VIN may cause permanent damage even if within transient limits specified elsewhere.
Does LT3990EDD#PBF support fixed 5V output without external resistors?
No, LT3990EDD#PBF is the adjustable version of the family and requires an external resistor divider on the FB pin to set output voltage. Fixed 5V variants exist (e.g., LT3990EMSE-5#PBF) but LT3990EDD#PBF itself is not internally trimmed to 5V; its feedback reference is 1.21V, so R1/R2 selection determines VOUT.
How does the power good (PG) signal behave on LT3990EDD#PBF?
The PG pin on LT3990EDD#PBF is an open-drain output that remains low until the FB voltage reaches 90% of the programmed regulation point. It becomes valid only when VIN > 4.2V and EN/UVLO is high. An external pull-up resistor is required; typical use includes MCU reset assertion or system power sequencing confirmation before enabling downstream loads.
Can LT3990EDD#PBF operate in Burst Mode at full 350mA load?
No, LT3990EDD#PBF automatically exits Burst Mode above ~10–20mA load and enters continuous conduction mode (CCM) to sustain 350mA output. Burst Mode is active only at light loads (typically <10mA), where it reduces quiescent current to 1.8µA while maintaining <5mVP-P ripple. At full load, PWM operation ensures fast transient response and stable regulation.
Is LT3990EDD#PBF pin-compatible with other packages in the LT3990 family?
No, LT3990EDD#PBF uses a 10-lead DFN package, while MSOP variants (e.g., LT3990EMSE#PBF) use a 16-lead MSOP with different pin count, layout, and NC pin assignments. Pin functions are not interchangeable; PCB redesign is required when migrating between DFN and MSOP packages-even for identical part numbers with different suffixes.
LT3990EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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:
- 10-DFN (3x3)
LT3990EDD#PBF FAQ
1.How can I place an order for LT3990EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990EDD#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 LT3990EDD#PBF reliable?
The price and inventory of LT3990EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3990EDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3990EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990EDD#PBF?
LT3990EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990EDD#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 LT3990EDD#PBF?
For technical support, including LT3990EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990EDD#PBF requirements.
6.How does Aetrix verify that LT3990EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3990EDD#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 LT3990EDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3990EDD#PBF?
All LT3990EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990EDD#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 LT3990EDD#PBF part is unused and in its original packaging.
Return procedure for LT3990EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3990EDD#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…
