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Texas Instruments LMS1585AISX-3.3/NO
- Part No.:
- LMS1585AISX-3.3/NO
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LMS1585AISX-3.3/NO.pdf
- Description:
- IC REG LIN 3.3V 5A DDPAK/TO263-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,982
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Product details
Overview
LMS1585AISX-3.3/NO from Texas Instruments is a 3.3V, 5A low-dropout linear regulator in TO-263 (KTT) package, designed for high-current microprocessor core and I/O supplies where fast transient response and tight load regulation are critical. It delivers stable 3.3V output with dropout voltage as low as 1.2V at 5A, line regulation of 0.005% (typ), and operates across −40°C to 125°C.
For engineers reviewing the LMS1585AISX-3.3/NO datasheet, LMS1585AISX-3.3/NO pinout, LMS1585AISX-3.3/NO application, or LMS1585AISX-3.3/NO equivalent, key selection considerations include industrial-grade temperature range, fixed 3.3V output, 5A continuous current capability, thermal shutdown protection, and compatibility with standard TO-263 PCB footprints and thermal pads.
Technical Context
The LMS1585AISX-3.3/NO integrates a zener-trimmed bandgap reference, internal current limiting, and thermal shutdown circuitry. Its architecture supports fast transient response due to low output impedance and optimized internal compensation, enabling stable operation with only 10µF output capacitance.
It features a fixed 3.3V output set by internal resistor divider, eliminating external feedback components. Dropout voltage remains ≤1.4V across full 0–5A load range at −40°C to 125°C, and ripple rejection reaches 72dB at 120Hz with 25µF tantalum output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.0% over full load and temperature range - ensures reliable logic-level compliance for 3.3V systems. |
| Max Output Current | 5A continuous - supports high-power microprocessor cores and FPGA I/O banks without external current boosting. |
| Dropout Voltage | 1.2V (typ) at 5A - enables operation from 4.75V input, minimizing power loss in low-VIN applications. |
| Line Regulation | 0.005% (typ) - maintains output stability despite input rail variations, critical for noise-sensitive digital loads. |
| Load Regulation | 0.05% (typ) - holds output within ±1.65mV from no-load to full 5A, preserving voltage margin in dynamic workloads. |
| Ripple Rejection | 72dB at 120Hz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Operating Temp | −40°C to 125°C junction - qualified for industrial and extended-temperature embedded control and communications equipment. |
Pinout & Package
Package: TO-263 (KTT), 3-pin surface-mount, with exposed thermal pad for enhanced heat dissipation. Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = GND (tab connected internally to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 1) | Regulator input supply connection | Accepts 4.75V–7V input; requires local 10µF ceramic or tantalum bypass capacitor for stability. |
| OUTPUT (Pin 2) | Regulated 3.3V output node | Delivers up to 5A; connects directly to load and output capacitor; low-impedance path minimizes IR drop. |
| GND (Pin 3 + Tab) | Reference and thermal return | Internally tied to exposed metal tab; must be soldered to large PCB copper area for thermal management and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Stabilizes within microseconds after 1A load step - prevents brownout during CPU burst activity. |
| Thermal shutdown protection | Activates at ~150°C junction temperature - prevents permanent damage under overload or poor heatsinking. |
| Current limiting | 5.0A minimum current limit - provides controlled foldback during short-circuit events without latch-up. |
| Low quiescent current | 7.0–13.0mA - reduces standby power loss in always-on subsystems without compromising regulation speed. |
| Industrial temp grade | −40°C to 125°C operation - eliminates derating for harsh-environment applications like motor drives and base stations. |
Applications
| Pentium® Processor Core Supply | PowerPC® I/O Rail |
|---|---|
Use Scenario: Powers the core voltage domain of legacy Pentium-class CPUs requiring tightly regulated 3.3V at up to 5A peak current. IC Role / Device Role / Timing Role: Primary low-noise post-regulator delivering clean, fast-response 3.3V to CPU VCC core pins. Use Value: Maintains <±1.65mV load regulation across 0–5A steps, preventing timing violations during instruction fetch bursts. | Use Scenario: Supplies 3.3V I/O banks for PowerPC-based communication controllers in industrial gateways. IC Role / Device Role / Timing Role: Fixed-output LDO providing ESD-robust, thermally stable interface voltage for multi-drop bus drivers. Use Value: 72dB ripple rejection isolates sensitive I/O logic from noisy 12V-to-3.3V DC/DC converter output. |
| Industrial PLC Backplane Logic | Medical Imaging Sensor Interface |
Use Scenario: Generates 3.3V for FPGA configuration and peripheral logic on ruggedized programmable logic controller backplanes. IC Role / Device Role / Timing Role: High-current, wide-temp LDO ensuring uninterrupted operation in uncooled enclosures. Use Value: −40°C to 125°C rating and thermal shutdown enable reliable 24/7 operation without forced air cooling. | Use Scenario: Powers analog front-end sensor interfaces in portable ultrasound units where low noise and compact size are essential. IC Role / Device Role / Timing Role: Low-noise, low-dropout regulator supplying precision ADC reference and signal chain bias rails. Use Value: RMS output noise of 0.003% of VOUT minimizes quantization error in 16-bit medical data acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS75533 | 5A, 3.3V fixed, 250mV dropout (at 3A), 1.2V min input, 16-pin HTSSOP | Lower dropout but requires external capacitors and layout space for larger package; lacks integrated thermal pad | Select when ultra-low dropout (<300mV) is mandatory and board space allows multi-pin package. |
| LMS1587ISX-3.3/NOPB | 3A max output, same TO-263 package, identical −40°C to 125°C range, 1.2V dropout (at 3A) | Lower current rating limits use to mid-power logic rails; shares pinout and footprint but not 5A capable | Select when system load stays below 3A and cost optimization is prioritized over headroom. |
Compared with TPS75533 and LMS1587ISX-3.3/NOPB, the LMS1585AISX-3.3/NO uniquely balances 5A capability, industrial temperature range, TO-263 thermal performance, and fixed 3.3V simplicity-making it optimal for space-constrained, high-reliability 3.3V microprocessor supplies.
Availability
LMS1585AISX-3.3/NO is available at Aetrix Electronics and suitable for industrial automation, medical imaging subsystems, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-exempt Pb-free manufacturing compliance.
Supply support for LMS1585AISX-3.3/NO 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The LMS1585A series was developed to address high-current, low-dropout regulation needs in microprocessor and FPGA power domains, emphasizing fast transient response, thermal robustness, and simplified fixed-voltage implementation.
FAQ
What is the minimum input voltage required for stable operation of the LMS1585AISX-3.3/NO?
The LMS1585AISX-3.3/NO requires a minimum input voltage of 4.75V to maintain 3.3V output regulation at full 5A load, based on its 1.2V typical dropout voltage. Below this threshold, output voltage drops linearly with input; operation below 4.75V is not guaranteed per datasheet specifications. The LMS1585AISX-3.3/NO is rated for inputs up to 7V maximum.
Does the LMS1585AISX-3.3/NO require external capacitors, and if so, what values are recommended?
Yes, the LMS1585AISX-3.3/NO requires a minimum 10µF output capacitor (tantalum or ceramic) for stability, as specified in the datasheet's "Required for Stability" note. An additional 10µF input capacitor is recommended near the INPUT pin. The LMS1585AISX-3.3/NO does not require an adjust capacitor since it is a fixed-output device with internal feedback.
Is the LMS1585AISX-3.3/NO pin-compatible with other devices in the LMS1585A/LMS1587 family?
Yes, the LMS1585AISX-3.3/NO shares the same 3-pin TO-263 (KTT) pinout - INPUT, OUTPUT, GND - with all LMS1585A and LMS1587 variants in KTT package, including LMS1585ACSX-3.3/NOPB and LMS1587ISX-3.3/NOPB. However, current capability (5A vs 3A) and temperature grade differ, so electrical validation is required before substitution. The LMS1585AISX-3.3/NO itself is not pin-compatible with TO-220 (NDE) variants due to different leadframe geometry.
What thermal management guidance applies to the LMS1585AISX-3.3/NO in high-power applications?
The LMS1585AISX-3.3/NO uses a TO-263 package with an exposed GND tab that must be soldered to a minimum 1000mm² copper pour for effective heat dissipation. Junction-to-case thermal resistance is 0.65°C/W (control section); at 5A and 1.4V dropout, power dissipation reaches ~7W, requiring careful PCB layout. The LMS1585AISX-3.3/NO includes thermal shutdown at ~150°C to prevent damage during transient overload.
How does the LMS1585AISX-3.3/NO compare to Linear Technology LT1585A-3.3 in terms of replacement feasibility?
The LMS1585AISX-3.3/NO is explicitly cited in TI's datasheet as a direct replacement for LT1585A/87 regulators, matching pinout, electrical specs, and thermal behavior. Both offer 3.3V/5A output, TO-263 packaging, and −40°C to 125°C operation. The LMS1585AISX-3.3/NO maintains identical dropout, line/load regulation, and protection features - enabling drop-in replacement without redesign, provided LT1585A-3.3 was used in the same package variant.
LMS1585AISX-3.3/NO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 13V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.4V @ 5A
- Current - Output:
- 5A
- Current - Quiescent (Iq):
- 13 mA
- Current - Supply (Max):
- -
- PSRR:
- 72dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-3)
LMS1585AISX-3.3/NO FAQ
1.How can I place an order for LMS1585AISX-3.3/NO through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS1585AISX-3.3/NO 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 LMS1585AISX-3.3/NO reliable?
The price and inventory of LMS1585AISX-3.3/NO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS1585AISX-3.3/NO is usually 5 days.
3.What payment methods are accepted for LMS1585AISX-3.3/NO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS1585AISX-3.3/NO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS1585AISX-3.3/NO?
LMS1585AISX-3.3/NO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS1585AISX-3.3/NO 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 LMS1585AISX-3.3/NO?
For technical support, including LMS1585AISX-3.3/NO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS1585AISX-3.3/NO requirements.
6.How does Aetrix verify that LMS1585AISX-3.3/NO is sourced from the original manufacturer or authorized distributors?
All LMS1585AISX-3.3/NO 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 LMS1585AISX-3.3/NO meets industry standards.
7.What is the process for return or replacement of LMS1585AISX-3.3/NO?
All LMS1585AISX-3.3/NO units undergo pre-shipment inspection (PSI). If there is an issue with LMS1585AISX-3.3/NO, 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 LMS1585AISX-3.3/NO part is unused and in its original packaging.
Return procedure for LMS1585AISX-3.3/NO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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