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Analog Devices Inc. LT3990HMSE-5#PBF
- Part No.:
- LT3990HMSE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3990HMSE-5#PBF.pdf
- Description:
- IC REG BUCK 5V 350MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:496
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Product details
Overview
LT3990HMSE-5#PBF from Analog Devices is a 62V input, 350mA fixed 5V monolithic buck regulator with integrated boost and catch diodes, 2.5µA quiescent current, low-ripple Burst Mode operation, and power-good flag - designed for automotive battery regulation and industrial supplies where high input voltage tolerance and ultra-low standby power are critical.
For engineers reviewing the LT3990HMSE-5#PBF datasheet, LT3990HMSE-5#PBF pinout, LT3990HMSE-5#PBF application, or LT3990HMSE-5#PBF equivalent, key selection criteria include its 5V fixed output, –40°C to 150°C junction temperature rating, 16-pin MSOP thermal performance (θJA = 40°C/W), AEC-Q100 qualification, and integrated diode architecture eliminating external Schottky requirements.
Technical Context
The LT3990HMSE-5#PBF implements constant-frequency current-mode control with programmable switching frequency (200kHz–2.2MHz via RT resistor), internal bipolar NPN switch with 210mV VCE(SAT), and dual current limiting: 700mA peak switch limit and 450mA valley catch diode limit. Its feedback loop regulates VOUT to 5.00V ±1.2% over temperature using an internal 1.21V reference and redundant VOUT pins.
Burst Mode operation reduces input supply current to 1.8µA at light loads while maintaining <5mVP-P output ripple; the power-good (PG) open-drain flag asserts when VOUT reaches 90% of regulation, and EN/UVLO provides accurate 1.19V threshold with 35mV hysteresis for reliable startup under varying battery conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±1.2% over –40°C to 150°C; eliminates external feedback resistors and improves accuracy vs. adjustable variants. |
| Input Voltage Range | 4.2V to 62V operating; supports wide automotive battery transients (cold crank, load dump) without external protection. |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT; enables >10-year battery life in always-on vehicle modules. |
| Switching Frequency | Programmable 200kHz–2.2MHz via RT-to-GND resistor; allows optimization of inductor size vs. efficiency for space-constrained designs. |
| Output Current | 350mA continuous; limited by thermal design (θJA = 40°C/W) and catch diode valley current (450mA min). |
| Package | 16-lead plastic MSOP with exposed thermal pad; delivers 40°C/W junction-to-ambient, enabling high-power density in automotive PCB layouts. |
| AEC-Q100 Grade | H-grade (–40°C to 150°C TJ); qualified per AEC-Q100 Rev G for automotive powertrain and body electronics applications. |
Pinout & Package
LT3990HMSE-5#PBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND), optimized for automotive thermal reliability. Pin functions are validated per Analog Devices datasheet DS3990b.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pins 1, 2) | Fixed-output voltage sense and regulation node | Internally connected; ties to output capacitor to close feedback loop for 5V regulation without external divider. |
| EN/UVLO (Pin 4) | Enable and undervoltage lockout input | 1.19V threshold with 35mV hysteresis; ensures clean startup above battery brownout thresholds. |
| VIN (Pin 6) | Main power input | Supplies internal circuitry and switch; rated to 62V absolute max; requires local ceramic bypass. |
| GND (Pins 8, 17) | Power and signal ground | Exposed pad (Pin 17) must be soldered to PCB copper for thermal and electrical integrity. |
| SW (Pin 9) | Internal switch output | Connects to inductor; carries pulsed current up to 700mA peak; requires low-inductance layout. |
| BOOST (Pin 11) | Bootstrap drive voltage source | Drives internal NPN switch base; requires external capacitor between BOOST and SW. |
| BD (Pin 13) | Boost diode anode connection | Provides bias power to internal regulator when >3.2V; improves efficiency by sourcing from regulated output. |
| PG (Pin 14) | Power-good open-drain flag | Signals valid 5V output (≥4.5V); requires external pull-up; valid only when VIN >4.2V and EN high. |
| RT (Pin 16) | Frequency setting input | Resistor to GND sets switching frequency; enables precise EMI control and inductor sizing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost and catch diodes | Eliminates two external Schottky diodes, reducing BOM count, board area, and thermal hotspots in automotive modules. |
| Low-ripple Burst Mode operation | Maintains <5mVP-P output ripple at light loads while drawing only 1.8µA input current - critical for always-on telematics systems. |
| FMEA fault-tolerant pinout | NC pins (3,5,7,10,12,15) remain unconnected internally; prevents malfunction during adjacent-pin shorts or floating pins in harsh environments. |
| Accurate programmable UVLO | 1.19V EN/UVLO threshold with 35mV hysteresis ensures robust start-up across battery voltage sag and recovery cycles. |
| Thermally enhanced MSOP package | θJA = 40°C/W and θJC = 10°C/W enable 350mA output at 150°C junction temperature without heatsinks. |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery rails (with 62V transient tolerance) for infotainment head units and ADAS camera modules. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying microcontroller, CAN transceiver, and image sensor logic rails. Use Value: AEC-Q100 H-grade rating and 150°C operation ensure reliability in engine bay and dashboard locations; integrated diodes reduce component count by two. | Use Scenario: Providing stable 5V power in DIN-rail mounted PLC I/O modules exposed to 48V industrial bus transients. IC Role / Device Role / Timing Role: Input-stage DC-DC converter converting wide-range industrial supply to isolated 5V logic rail. Use Value: 62V input capability eliminates need for upstream TVS clamping; 2.5µA quiescent current extends backup battery runtime during AC loss. |
| Portable Medical Devices | Ruggedized IoT Gateways |
Use Scenario: Powering handheld ultrasound or glucose monitors powered by single-cell Li-ion (4.2V) or multi-cell packs (up to 25.2V). IC Role / Device Role / Timing Role: Main system regulator delivering 5V to ARM Cortex-M MCU and BLE radio subsystem. Use Value: Low-ripple Burst Mode maintains <5mV ripple during sleep mode, preventing RF interference with sensitive analog front-ends. | Use Scenario: Supplying 5V to cellular modem, Ethernet PHY, and security MCU in outdoor wireless gateways operating from solar-charged 24V batteries. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator bridging variable solar input to fixed 5V system rail. Use Value: 350mA output and 150°C rating support full-power LTE transmission in sealed enclosures; PG flag enables firmware-controlled power sequencing. |
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 | 40V max input, 300mA output, no integrated catch diode, higher 15µA IQ | Lacks 62V transient handling and automotive temp grade; suitable for non-automotive 5V point-of-load | Select if lower cost and 40V input suffices; requires external catch diode and heatsinking for 300mA. |
| MPQ4420AGL-A-Z | 40V max input, 2A output, integrated MOSFETs, 25µA IQ, no PG flag | Higher current but lacks AEC-Q100, PG, and Burst Mode ripple control; not qualified for automotive safety-critical use | Choose for industrial 2A applications needing higher output; avoid where <5mV ripple or automotive qualification is mandatory. |
Compared with LTC3630EMSE-5#PBF and MPQ4420AGL-A-Z, the LT3990HMSE-5#PBF uniquely combines 62V input, AEC-Q100 H-grade, integrated diodes, <5mV ripple Burst Mode, and PG flag - making it the only drop-in solution for automotive 5V regulation requiring zero external diodes and guaranteed 150°C operation.
Availability
LT3990HMSE-5#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3990HMSE-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 ICs, serving automotive, industrial, and communications markets with precision, reliability, and longevity.
The LT3990 product line delivers high-voltage monolithic buck regulators with integrated diodes and ultra-low IQ for automotive and industrial applications where input transients, thermal stress, and long-term reliability are primary design constraints.
FAQ
What is the maximum input voltage rating for LT3990HMSE-5#PBF?
The LT3990HMSE-5#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 automotive battery systems subject to load-dump transients. Exceeding 62V on VIN may cause permanent damage, even briefly.
Does LT3990HMSE-5#PBF require external diodes?
No, the LT3990HMSE-5#PBF 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 - a key differentiator versus discrete-diode buck controllers.
What is the purpose of the BD pin on LT3990HMSE-5#PBF?
The BD (Boost Diode) pin on LT3990HMSE-5#PBF connects to the anode of the internal boost diode and also supplies bias current to the internal regulator when held above 3.2V - typically tied to the 5V output. This improves conversion efficiency by powering control circuitry from the regulated output instead of VIN.
How does the power-good (PG) flag function on LT3990HMSE-5#PBF?
The PG pin on LT3990HMSE-5#PBF is an open-drain output that remains low until the 5V output reaches 90% (4.5V) of regulation. It is valid only when VIN > 4.2V and EN/UVLO is high. An external pull-up resistor is required to generate a logic-high signal for system power sequencing.
Is LT3990HMSE-5#PBF qualified for automotive applications?
Yes, the LT3990HMSE-5#PBF is AEC-Q100 qualified (Grade H, –40°C to 150°C junction temperature) and manufactured with controlled processes for automotive use. It meets stringent reliability, ESD, and thermal cycling requirements for powertrain, body, and chassis electronics.
LT3990HMSE-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3990HMSE-5#PBF FAQ
1.How can I place an order for LT3990HMSE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3990HMSE-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 LT3990HMSE-5#PBF reliable?
The price and inventory of LT3990HMSE-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 LT3990HMSE-5#PBF is usually 5 days.
3.What payment methods are accepted for LT3990HMSE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3990HMSE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3990HMSE-5#PBF?
LT3990HMSE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3990HMSE-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 LT3990HMSE-5#PBF?
For technical support, including LT3990HMSE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3990HMSE-5#PBF requirements.
6.How does Aetrix verify that LT3990HMSE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3990HMSE-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 LT3990HMSE-5#PBF meets industry standards.
7.What is the process for return or replacement of LT3990HMSE-5#PBF?
All LT3990HMSE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3990HMSE-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 LT3990HMSE-5#PBF part is unused and in its original packaging.
Return procedure for LT3990HMSE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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