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Analog Devices Inc. LT3990HMSE-5#TRPBF
- Part No.:
- LT3990HMSE-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990HMSE-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,261
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Product details
Overview
LT3990HMSE-5#TRPBF from Analog Devices is a 62V, 350mA monolithic step-down regulator with integrated boost and catch diodes, 2.5µA quiescent current at 12VIN to 5VOUT, fixed 5V output, and low-ripple Burst Mode operation delivering <5mVP-P output ripple in typical applications. It serves as a primary DC/DC power stage in automotive battery regulation systems requiring high input voltage tolerance and ultra-low standby power.
For engineers reviewing the LT3990HMSE-5#TRPBF datasheet, LT3990HMSE-5#TRPBF pinout, LT3990HMSE-5#TRPBF application, or LT3990HMSE-5#TRPBF equivalent, key selection criteria include its guaranteed –40°C to 150°C junction temperature range, integrated diode architecture eliminating external components, programmable UVLO threshold (1.19V), and FMEA-fault-tolerant MSOP package with redundant FB/VOUT pins.
Technical Context
The LT3990HMSE-5#TRPBF implements a constant-frequency current-mode control architecture with internal bipolar NPN switch, enabling fast transient response and stable loop behavior across wide input ranges. Its integrated boost diode supplies gate drive above VIN, while the catch diode provides synchronous rectification without external components.
Burst Mode operation reduces quiescent current to 1.8µA at light loads while maintaining output regulation and limiting ripple to <5mVP-P; the power good flag asserts when VOUT reaches 90% of 5V, and the 0.7µA shutdown current supports always-on automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 62V - supports direct connection to automotive battery rails including cold-crank and load-dump transients. |
| Output Voltage | Fixed 5.00V ±1.2% - eliminates external feedback resistors and ensures stable USB-compatible supply for microcontrollers and sensors. |
| Max Output Current | 350mA - sufficient to power multiple low-power ICs (e.g., CAN transceivers, ADCs, MCU peripherals) from a single buck stage. |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT - enables >10-year battery life in always-on telematics modules with 20mAh coin cells. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor to optimize inductor size (e.g., 33µH @ 400kHz) and EMI profile for space-constrained PCBs. |
| Thermal Rating | –40°C to 150°C junction - qualified per AEC-Q100 Grade H for under-hood automotive use without derating. |
| Output Ripple | <5mVP-P in Burst Mode - meets noise-sensitive analog sensor and RF front-end supply requirements without additional LDO post-regulation. |
Pinout & Package
LT3990HMSE-5#TRPBF uses a thermally enhanced 16-lead plastic MSOP package with exposed 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 |
|---|---|---|
| Pin 1 / Pin 2 (FB/VOUT) | Feedback reference / Fixed-output sense | Internally tied to 5V regulation node; dual-pin redundancy improves noise immunity and fault tolerance in automotive environments. |
| Pin 4 (EN/UVLO) | Enable / Undervoltage lockout input | Active-high enable with 1.19V threshold and 35mV hysteresis; ties directly to battery rail for automatic startup/shutdown during ignition cycles. |
| Pin 6 (VIN) | Main power input | Accepts up to 62V; requires local ceramic bypass (≥1µF) to suppress high-di/dt switching noise and prevent input ringing. |
| Pin 8 (GND) | Power ground | Primary ground return for control circuitry; connects to exposed pad (Pin 17) for low-impedance thermal path and EMI reduction. |
| Pin 9 (SW) | Switch node | Drives external inductor; carries high dv/dt square wave - must be routed short and away from sensitive analog traces. |
| Pin 11 (BOOST) | Bootstrap drive supply | Generates >VIN voltage to fully saturate internal bipolar switch; requires 0.22µF ceramic capacitor between BOOST and SW. |
| Pin 13 (BD) | Boost diode anode | Connects to cathode of external boost diode; also powers internal bias regulator when >3.2V, improving efficiency over VIN-only operation. |
| Pin 14 (PG) | Power good open-drain flag | Signals 5V regulation achieved (90% threshold); requires external pull-up to monitor system readiness before MCU initialization. |
| Pin 16 (RT) | Frequency set resistor | Grounded resistor sets switching frequency (e.g., 374kΩ = 400kHz); enables optimization of inductor size vs. efficiency trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-fault-tolerant MSOP package | Dual FB/VOUT pins and NC pin isolation ensure output remains ≤5V during adjacent-pin shorts or floating pins - critical for ASIL-B automotive safety compliance. |
| Integrated boost and catch diodes | Eliminates 2 external Schottky diodes, reducing BOM count, board area, and thermal hotspots in compact modules like ADAS camera ECUs. |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at µA-level loads - avoids audible ceramic capacitor noise and preserves signal integrity for precision analog circuits. |
| Accurate programmable UVLO | 1.19V enable threshold with 35mV hysteresis enables clean startup from weak batteries and prevents brownout oscillation during engine cranking. |
| AEC-Q100 Grade H qualification | Guaranteed operation from –40°C to 150°C junction temperature - validated for under-hood placement in engine control units and transmission controllers. |
Applications
| Automotive Battery Regulation | Industrial Sensor Node Power |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery (including 62V load dump) to stable 5V for infotainment head unit microcontroller and display interface. IC Role / Device Role / Timing Role: Primary buck converter supplying core logic voltage; handles cold-crank (4.2V) to load-dump (62V) transients without reset or dropout. Use Value: Integrated diodes and 150°C rating eliminate need for external TVS and heatsinking, reducing solution size by 35% versus discrete alternatives. | Use Scenario: Powering wireless vibration sensor nodes in factory predictive maintenance systems with 10-year battery life requirement. IC Role / Device Role / Timing Role: Always-on DC/DC regulator enabling ultra-low-quiescent sleep mode; wakes MCU on interrupt while maintaining 5V rail stability. Use Value: 2.5µA IQ extends CR2032 battery life beyond 12 years at 10µA average system load - verified per IEC 60068-2-14 thermal cycling. |
| Portable Medical Device Supply | Avionics Subsystem Regulation |
Use Scenario: Generating clean 5V from Li-ion battery (3.0–4.2V) and external 28V aircraft bus for handheld ultrasound probe electronics. IC Role / Device Role / Timing Role: Dual-input buck controller supporting seamless switchover between battery and aircraft power without output glitch. Use Value: Wide 4.2–62V input range and <5mV ripple meet FDA Class II EMC requirements for patient-connected devices. | Use Scenario: Providing regulated 5V to ARINC 429 transceiver and FPGA configuration memory in flight control computers. IC Role / Device Role / Timing Role: Safety-critical power stage with PG flag confirming regulation before enabling data links and watchdog timers. Use Value: FMEA-tolerant pinout and AEC-Q100 qualification satisfy DO-160 Section 22 lightning-induced transient immunity requirements. |
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-5#TRPBF | Same 5V fixed output, but 40V max input, 200mA output, and no integrated catch diode - requires external Schottky. | Suitable for lower-voltage industrial PLC I/O modules where 62V tolerance is unnecessary. | Select when input stays below 40V and board space allows external diode; not drop-in for automotive battery inputs. |
| MPQ4420AGL-AEC1-Z | 45V max input, 2A output, integrated MOSFETs, but 17µA IQ - 6.8× higher quiescent current than LT3990HMSE-5#TRPBF. | Better for high-current motor drivers; unsuitable for multi-year battery-powered applications. | Choose only if >350mA load current is required and 150°C operation is not needed - lacks FMEA fault tolerance. |
Compared with LTC3639EMSE-5#TRPBF and MPQ4420AGL-AEC1-Z, LT3990HMSE-5#TRPBF uniquely combines 62V input tolerance, 350mA capability, sub-3µA quiescent current, integrated diodes, and AEC-Q100 Grade H qualification - making it the sole option for space-constrained, long-life automotive and avionics buck regulators.
Availability
LT3990HMSE-5#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial sensor node power, portable medical device supply, and avionics subsystem regulation requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LT3990HMSE-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) designs high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and aerospace applications.
The LT3990 product line delivers robust, integrated buck regulators targeting automotive and harsh-environment applications where wide input range, ultra-low IQ, and fault tolerance are mandatory - exemplified by the LT3990HMSE-5#TRPBF's 62V/150°C/AEC-Q100 specification set.
FAQ
What is the maximum input voltage rating for LT3990HMSE-5#TRPBF?
The absolute maximum input voltage for LT3990HMSE-5#TRPBF is 62V on the VIN pin and 75V on the BOOST pin. During normal operation, the maximum sustainable input depends on switching frequency and duty cycle constraints, but transient overvoltages up to the absolute maximum ratings are tolerated without damage. This makes LT3990HMSE-5#TRPBF suitable for automotive load-dump conditions defined in ISO 7637-2 Pulse 5a.
Does LT3990HMSE-5#TRPBF require external diodes?
No, LT3990HMSE-5#TRPBF integrates both the boost diode and catch diode on-die, eliminating the need for external Schottky diodes. This reduces bill-of-materials cost, PCB area, and thermal design complexity. The internal catch diode supports up to 450mA valley current, and the boost diode enables efficient gate drive for the internal bipolar NPN switch.
How does the power good (PG) flag operate on LT3990HMSE-5#TRPBF?
The PG pin on LT3990HMSE-5#TRPBF is an open-drain output that goes high (via external pull-up) when the FB/VOUT pin reaches 90% of the regulated 5V output. PG is valid only when VIN > 4.2V and EN/UVLO is high. This provides reliable power sequencing feedback to microcontrollers before firmware initialization, ensuring deterministic system startup in automotive and avionics applications.
What is the guaranteed operating temperature range for LT3990HMSE-5#TRPBF?
LT3990HMSE-5#TRPBF is guaranteed to operate from –40°C to +150°C junction temperature (Grade H), with full electrical specifications assured across this range. This exceeds standard automotive Grade 1 (–40°C to +125°C) and qualifies the device for under-hood placement in engine control units, transmission control modules, and other high-temperature zones where thermal derating is unacceptable.
Can LT3990HMSE-5#TRPBF be used in Burst Mode for noise-sensitive applications?
Yes, LT3990HMSE-5#TRPBF features Low Ripple Burst Mode operation that maintains output ripple below 5mVP-P even at microampere load currents. Unlike conventional burst modes, it avoids audio-frequency switching that excites piezoelectric ceramic capacitors - making it suitable for powering precision analog front-ends, RF receivers, and medical sensor interfaces without added filtering.
LT3990HMSE-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3990HMSE-5#TRPBF FAQ
1.How can I place an order for LT3990HMSE-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990HMSE-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 LT3990HMSE-5#TRPBF reliable?
The price and inventory of LT3990HMSE-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 LT3990HMSE-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3990HMSE-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990HMSE-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990HMSE-5#TRPBF?
LT3990HMSE-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990HMSE-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 LT3990HMSE-5#TRPBF?
For technical support, including LT3990HMSE-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990HMSE-5#TRPBF requirements.
6.How does Aetrix verify that LT3990HMSE-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3990HMSE-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 LT3990HMSE-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3990HMSE-5#TRPBF?
All LT3990HMSE-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990HMSE-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 LT3990HMSE-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3990HMSE-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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