LMS1585AISX-3.3/NO Texas Instruments Integrated Circuit (Other) In Stock
Texas Instruments LMS1585AISX-3.3/NO is a high-current 5 A fixed 3.3 V LDO linear regulator with 1.2 V typical dropout voltage, 4.75 V to 13 V input range, and a surface-mount power package for demanding processor and FPGA power supply designs.
- Manufacturer
- Texas Instruments
- Package
- Other
- Pin Count
- 4
- Lifecycle
- ACTIVE
- Datasheet
- LMS1585AISX-3.3/NO Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.5700(MOQ 1000)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- High 5 A output current fixed 3.3 V LDO linear regulator with 1.2 V typical dropout voltage
- Wide 4.75 V to 13 V input voltage range supporting 5 V and 12 V power supply rails
- Fast transient response for powering DSPs, FPGAs, and high-current microprocessor core rails
- RoHS-compliant surface-mount package with thermal pad for efficient heat dissipation at high load currents
Applications
The LMS1585AISX-3.3/NO is designed for powering high-current digital loads such as FPGAs, DSPs, microprocessors, and memory banks in networking equipment, industrial computers, and embedded processing boards from 5 V or 12 V supply rails. Its 5 A current capability and 1.2 V dropout allow stable 3.3 V regulation even under heavy transient loads typical of FPGA I/O toggling and memory burst transfers. The surface-mount power package with thermal pad ensures efficient junction cooling for sustained high-current operation in density-constrained rack-mount and board-level systems.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Not Compliant |
| Date Of Intro | 2017-02-17 |
| YTEOL | 15 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 1.4V |
| Dropout Voltage1-Nom | 1.2V |
| Input Voltage Absolute-Max | 13V |
| Input Voltage-Max | 13V |
| Input Voltage-Min | 4.75V |
| JESD-30 Code | R-PSSO-G3 |
| JESD-609 Code | e3 |
| Line Regulation-Max | 0.0066% |
| Load Regulation-Max | 0.0165% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Output Current1-Max | 5A |
| Output Voltage1-Max | 3.365V |
| Output Voltage1-Min | 3.235V |
| Output Voltage1-Nom | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SMSIP3H,.55TB |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 245 |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 2.54mm |
| Terminal Position | SINGLE |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 2% |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the maximum output current and dropout voltage specification of the LMS1585AISX-3.3/NO?
The LMS1585AISX-3.3/NO delivers up to 5 A continuous output current at a fixed 3.3 V output, with a typical dropout voltage of 1.2 V and a maximum of 1.4 V. This means the device maintains a stable 3.3 V output as long as the input voltage remains above 4.5 V, making it compatible with 5 V regulated bus rails commonly used in industrial computing and networking boards.
Can the LMS1585AISX-3.3/NO regulate from a 12 V input, and what thermal considerations apply at high current?
The LMS1585AISX-3.3/NO accepts input voltages up to 13 V absolute maximum, so a 12 V input is within specification. However, operating at 5 A output with a 12 V input creates a power dissipation of approximately 43.5 W, which requires substantial heatsinking or forced-air cooling. For 12 V to 3.3 V conversion at high currents, a switching pre-regulator followed by the LMS1585 for final precision regulation is strongly recommended to reduce thermal stress and improve overall efficiency.
Which high-current digital load applications are best served by the LMS1585AISX-3.3/NO?
The LMS1585AISX-3.3/NO is best suited for FPGA core and I/O power rails at 3.3 V drawing 2 A to 5 A, DDR memory power supplies, and multi-processor board power trees where multiple 3.3 V loads share a common regulated rail. Its low-noise linear regulation is preferred over switching regulators for RF-sensitive boards, measurement instruments, and audio processing hardware where switching noise at hundreds of kilohertz would degrade signal integrity on the 3.3 V analog and mixed-signal rails.
How does the LMS1585AISX-3.3/NO compare to a switching buck regulator for a 5 V to 3.3 V conversion?
The LMS1585AISX-3.3/NO linear regulator offers zero switching noise, simpler design with no inductor or high-frequency capacitor, and inherently faster transient response compared to a buck switching regulator at the same 5 A load. The trade-off is efficiency: at 5 A from 5 V input, the LMS1585 dissipates approximately 8.5 W as heat versus under 1 W for a 90%-efficient buck. For noise-critical applications or where the 5 V to 3.3 V voltage difference keeps power loss acceptable, the linear approach is preferred; for high-power or thermally constrained designs, a buck regulator is more practical.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1000+ | $1.6600 | $1660.00 |
| 2500+ | $1.6000 | $4000.00 |
| 5000+ | $1.5700 | $7850.00 |
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