LT8631
RECOMMENDED FOR NEW DESIGNS100V, 1A Synchronous Micropower Step-Down Regulator
- Part Models
- 6
- 1ku List Price
- Starting From $5.46
Overview
- Ultrawide Input Voltage Range: 3V to 100V
- Output Voltage Range: 0.8V to 60V
- Internal Synchronous Switches
- Low Ripple Burst Mode® Operation:
- 16μA IQ at 12VIN to 5VOUT Output Ripple <10mVP-P
- 7μA IQ at 48VIN to 5VOUT Output Ripple <10mVP-P
- Low Dropout: 99% Maximum Duty Cycle
- Peak Current Mode Control
- Fixed Frequency Operation: 100kHz to 1MHz
- Synchronization Input
- Programmable Undervoltage Lockout
- Power Good Flag
- Flexible Output Voltage Tracking
- Short-Circuit Protection
- Low Shutdown Current: 5μA
- Tolerates Pin Open/Short Faults
- Thermally Enhanced 20-Lead TSSOP with High Voltage Lead Spacing
The LT8631 is a current mode PWM step-down DC/DC converter with internal synchronous switches that provide current for output loads up to 1A. The wide input range of 3V to 100V makes the LT8631 suitable for regulating power from a wide variety of sources, including automotive and industrial systems and 36V to 72V telecom supplies. Low ripple Burst Mode operation enables high efficiency operation down to very low output currents while keeping the output ripple below 10mVP-P. Resistor programmable 100kHz to 1MHz frequency range and synchronization capability enable optimization between efficiency and external component size. The soft-start feature controls the ramp rate of the output voltage, eliminating input current surge during start-up, while also providing output tracking. A power good flag signals when the output voltage is within ±7.5% of the regulated output. Undervoltage lockout can be programmed using the EN/UV pin. Shutdown mode reduces the total quiescent current to < 5μA. The LT8631 is available in a 20-lead TSSOP package with exposed pad for low thermal resistance and high voltage lead spacing.
APPLICATIONS
- Telecom Supplies
- Distributed Supply Regulation
Documentation
Data Sheet 1
User Guide 1
Technical Articles 2
Product Selector Card 2
Analog Dialogue 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT8631EFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT8631EFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT8631HFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT8631HFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT8631IFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT8631IFE#TRPBF | 20-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT8631EFE#PBF | PRODUCTION | |
| LT8631EFE#TRPBF | PRODUCTION | |
| LT8631HFE#PBF | PRODUCTION | |
| LT8631HFE#TRPBF | PRODUCTION | |
| LT8631IFE#PBF | PRODUCTION | |
| LT8631IFE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Overvoltage & Overcurrent Protectors 1 | ||
| LTC4366 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT8631
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LT8631
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
