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Analog Devices Inc. LT8631IFE#TRPBF
- Part No.:
- LT8631IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LT8631IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,721
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Product details
Overview
LT8631IFE#TRPBF from Analog Devices is a 100V input, 1A synchronous step-down DC/DC regulator with internal MOSFETs, peak current mode control, and low-ripple Burst Mode operation enabling 16µA quiescent current at 12VIN→5VOUT. It supports 3V–100V input, 0.8V–60V output, and operates from –40°C to 125°C in automotive and telecom power systems.
For engineers reviewing the LT8631IFE#TRPBF datasheet, LT8631IFE#TRPBF pinout, LT8631IFE#TRPBF application, or LT8631IFE#TRPBF equivalent, key selection criteria include ultrawide VIN tolerance, programmable UVLO via EN/UV, power-good flag with ±7.5% threshold, soft-start/tracking capability, and thermal-enhanced 20-lead TSSOP packaging with exposed GND pad.
Technical Context
The LT8631IFE#TRPBF implements constant-frequency peak current mode control with internal top (775mΩ) and bottom (550mΩ) synchronous switches. Its VC node regulates peak inductor current up to 2.1A typical, while minimum on-time (120ns) and off-time (190ns) support high VIN/VOUT ratios and dropout operation down to 99% duty cycle.
Burst Mode activation is controlled by the SYNC/MODE pin: grounded for low-ripple (<10mVP-P) light-load operation at ~16µA IQ, or pulled high for pulse-skipping mode. Frequency is resistor-programmable (100kHz–1MHz) via RT pin or externally synchronized within 100kHz–1MHz range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - supports direct connection to 24V/48V/72V telecom rails and automotive battery transients without pre-regulation. |
| Output Current | 1A continuous - delivers full rated load at VOUT = 5V with VIN ≥ 7.5V and proper thermal layout. |
| Quiescent Current | 16µA at 12VIN→5VOUT in Burst Mode - enables >10-year battery life in always-on industrial sensors. |
| Feedback Reference | 0.808V ±12mV - sets precise output regulation; used with external resistor divider to program VOUT from 0.8V to 60V. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT pin (e.g., 25.5kΩ = 400kHz); enables trade-off between efficiency and magnetics size. |
| Power Good Flag | ±7.5% VFBREF threshold with 1.9% hysteresis - provides reliable system power sequencing and fault detection. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial control cabinet environments. |
Pinout & Package
The LT8631IFE#TRPBF is housed in a thermally enhanced 20-lead plastic TSSOP package (FE20) with exposed GND pad (Pin 21), 40°C/W θJA, and high-voltage lead spacing compliant with 100V operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main power input and switch drain | Accepts 3V–100V; must be decoupled locally to GND; supplies internal bias and drives top switch. |
| EN/UV (3) | Enable and undervoltage lockout input | Active-high enable (1.19V threshold); programmable UVLO using external resistive divider from VIN. |
| PG (5) | Open-drain power-good flag | Sinks current when VOUT deviates >±7.5% from regulation; 1.9% hysteresis prevents chatter during marginal conditions. |
| SYNC/MODE (7) | Mode selection and synchronization input | GND = Burst Mode; >1.5V = pulse-skipping; external clock (100–1000kHz, 20–80% duty) forces sync operation. |
| RT (8) | Frequency programming input | Resistor to GND sets switching frequency (100kHz–1MHz); 19.6kΩ yields 500kHz typical. |
| TR/SS (10) | Soft-start and tracking control | Capacitor to GND controls VOUT ramp rate; also accepts external voltage for output tracking during startup. |
| FB (11) | Feedback input | Inverting input of error amplifier; regulated to 0.808V; connects to resistor divider from VOUT. |
| VOUT (12) | Output sense and current sensing | Connects to output capacitor; internal current sense point for peak current mode control. |
| IND (14) | Inductor connection | High-side connection point for external inductor; carries full switched current. |
| INTVCC (16) | Internal LDO bypass | Bypassed with 2.2µF ceramic capacitor to GND; powers internal circuitry when VOUT ≥ 3.5V. |
| BST (18) | Bootstrap supply for top switch | 0.1µF capacitor to SW generates gate drive voltage >VIN; critical for top FET turn-on. |
| SW (20) | Switch node | Drives external inductor; high dI/dt node requiring short PCB trace and local BST cap placement. |
| GND (21) | Power and signal ground | Exposed pad - sole ground reference; must be soldered to large copper area for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrawide 3V–100V input range | Eliminates need for front-end pre-regulators in 24V/48V industrial and automotive battery-fed systems. |
| Low-ripple Burst Mode operation | Maintains <10mVP-P output ripple at no-load while achieving 16µA IQ, extending battery runtime. |
| Programmable undervoltage lockout | EN/UV pin allows custom start-up voltage threshold (e.g., 12V system start at 9V) using two external resistors. |
| Flexible soft-start and tracking | TR/SS pin supports both controlled VOUT ramp-up and coordinated sequencing with other rails via external voltage source. |
| Thermally robust TSSOP-20 package | Exposed GND pad reduces θJC to 10°C/W, enabling 1A operation at 125°C ambient with minimal heatsinking. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 5V microcontroller, CAN transceiver, and display backlight from vehicle battery (9V–16V nominal, up to 100V load dump). IC Role / Device Role / Timing Role: Primary 1A buck regulator providing stable 5V rail with fast transient response to handle ignition pulses and load dumps. Use Value: 100V absolute max rating withstands ISO 7637-2 Pulse 5a (100V/100ms); 16µA IQ minimizes parasitic drain during vehicle sleep mode. | Use Scenario: Generating isolated 3.3V/5V rails for digital I/O and analog sensor interfaces in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Input-stage DC/DC converter accepting wide-range 24V/48V field power and delivering tightly regulated low-noise outputs. Use Value: 3V–100V input range accommodates brownouts and surges per IEC 61000-4-5; ±7.5% PG flag ensures deterministic system reset on rail collapse. |
| Telecom Distributed Supply | Medical Diagnostic Equipment |
Use Scenario: Local point-of-load conversion from 48V telecom backplane to 3.3V core logic and 12V analog subsystems. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck converter operating at 400kHz to minimize EMI in dense board layouts. Use Value: 400kHz fixed frequency (via 25.5kΩ RT) enables predictable filter design; <10mVP-P ripple avoids noise coupling into sensitive ADC references. | Use Scenario: Powering FPGA, ADC, and precision op-amps in portable ultrasound or patient monitor units with long battery life requirements. IC Role / Device Role / Timing Role: Primary battery-fed buck regulator delivering ultra-low-quiescent 3.3V/5V rails with soft-start for controlled system wake-up. Use Value: 16µA IQ extends lithium-ion battery life beyond 10 years in standby; TR/SS tracking synchronizes rail ramp-up with FPGA configuration sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640SIFE#TRPBF | Higher 4A output, 3.4V–65V input, integrated compensation, lower 2.5µA IQ in Silent Switcher mode | Requires larger solution size; better suited for multi-rail systems needing higher current and lower EMI | Select when >1A load or stricter EMI compliance (CISPR 22 Class B) is required; not pin-compatible. |
| LM5164QPWPRQ1 | 40V max input, 1A output, 3.5µA IQ, integrated soft-start, AEC-Q100 Grade 1 | Limited to automotive 12V/24V systems; lacks 100V capability and programmable UVLO | Choose for cost-sensitive automotive body electronics where 100V rating is unnecessary and AEC-Q100 qualification is mandatory. |
Compared with LT8631IFE#TRPBF, LT8640SIFE#TRPBF offers higher current and lower EMI but requires PCB redesign, while LM5164QPWPRQ1 provides automotive qualification and lower IQ but sacrifices ultrawide input range and flexible UVLO programming-making LT8631IFE#TRPBF optimal for 3V–100V industrial and telecom applications demanding proven reliability and design flexibility.
Availability
LT8631IFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and telecom distributed supply applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT8631IFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8631IFE#TRPBF belongs to the Power by Linear™ family of high-voltage monolithic DC/DC regulators, designed specifically for ultrawide-input industrial and automotive power conversion where reliability, low quiescent current, and robust fault protection are critical.
FAQ
What is the maximum input voltage rating for the LT8631IFE#TRPBF?
The LT8631IFE#TRPBF has an absolute maximum input voltage rating of 100V on the VIN pin, with guaranteed operation across 3V to 100V. This enables direct connection to harsh automotive and telecom power buses without external protection circuitry, provided layout maintains adequate creepage and clearance per IPC-2221.
How does the LT8631IFE#TRPBF achieve 16µA quiescent current?
The LT8631IFE#TRPBF achieves 16µA quiescent current through low-ripple Burst Mode operation, where internal control circuitry shuts down between energy pulses to the output capacitor. At no load, this results in ~16µA total input current at 12VIN→5VOUT, confirmed in the Electrical Characteristics table and Typical Performance curves.
Can the LT8631IFE#TRPBF be synchronized to an external clock?
Yes, the LT8631IFE#TRPBF can be synchronized to an external clock applied to the SYNC/MODE pin. The device accepts external signals from 100kHz to 1000kHz with 20–80% duty cycle, and automatically enters pulse-skipping mode during synchronization-enabling deterministic EMI reduction in noise-sensitive systems.
What is the purpose of the TR/SS pin on the LT8631IFE#TRPBF?
The TR/SS pin on the LT8631IFE#TRPBF serves dual functions: soft-start control (via capacitor to GND) and output voltage tracking. When driven by an external voltage source, it forces the LT8631IFE#TRPBF output to follow that reference during startup, enabling precise power sequencing in multi-rail systems without additional ICs.
Does the LT8631IFE#TRPBF include overtemperature protection?
Yes, the LT8631IFE#TRPBF includes internal overtemperature protection that disables switching and places the device in thermal shutdown when junction temperature exceeds safe limits. Recovery occurs automatically once temperature falls below the hysteresis threshold, ensuring robust operation in sealed enclosures or high-ambient environments.
LT8631IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 60V
- Current - Output:
- 1A
- Frequency - Switching:
- 100kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8631IFE#TRPBF FAQ
1.How can I place an order for LT8631IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8631IFE#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 LT8631IFE#TRPBF reliable?
The price and inventory of LT8631IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8631IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8631IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8631IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8631IFE#TRPBF?
LT8631IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8631IFE#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 LT8631IFE#TRPBF?
For technical support, including LT8631IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8631IFE#TRPBF requirements.
6.How does Aetrix verify that LT8631IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8631IFE#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 LT8631IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8631IFE#TRPBF?
All LT8631IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8631IFE#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 LT8631IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8631IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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