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Texas Instruments LM1572MTCX-3.3/NOPB
- Part No.:
- LM1572MTCX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM1572MTCX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
LM1572MTCX-3.3/NOPB from Texas Instruments (formerly National Semiconductor) is a fixed-output 3.3V, 1.5A, 500kHz synchronous step-down DC/DC regulator in TSSOP-16 package, featuring current-mode control, 150mΩ internal MOSFET, programmable soft-start, and 26µA shutdown current-designed for compact local power conversion in LCD monitors and set-top boxes.
For engineers reviewing the LM1572MTCX-3.3/NOPB datasheet, LM1572MTCX-3.3/NOPB pinout, LM1572MTCX-3.3/NOPB application, or LM1572MTCX-3.3/NOPB equivalent, key selection criteria include guaranteed 1.5A load capability, ±3% output voltage accuracy at 3.3V, 400–570kHz switching frequency range, thermal shutdown, and cycle-by-cycle current limiting under transient overload.
Technical Context
The LM1572MTCX-3.3/NOPB implements peak current-mode control with internally compensated slope compensation to prevent subharmonic oscillation at duty cycles above 50%. Its fixed 3.3V output is achieved via internal resistor divider tied to FB pin, eliminating external feedback components.
It integrates a 150mΩ N-channel MOSFET switch and bootstrap circuitry, supports input voltage range of 8.5V to 16V, and employs frequency foldback during startup or overload to limit inrush current-enabling stable operation without external timing capacitors or compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (VFB_3.3 = 3.3V nominal, min/max 3.16V/3.44V) |
| Max Output Current | 1.5A continuous (guaranteed over −40°C to +125°C junction temp) |
| Switching Frequency | 400–570kHz (typical 500kHz; enables use of small 2.2–4.7µH inductors) |
| Input Voltage Range | 8.5V to 16V (supports 12V rail down-conversion with margin) |
| Shutdown Current | 26µA max (enables low-power system sequencing) |
| Thermal Resistance | 130°C/W (θJA, TSSOP-16 on 1in² copper) |
| Current Limit Threshold | 2.0–3.2A (cycle-by-cycle protection, independent of load and input) |
Pinout & Package
TSSOP-16 (NS Package Number MTC16), thermally enhanced with exposed pad (not electrically connected), 5mm × 4.4mm footprint, 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply (8.5–16V); connects to bulk capacitor and switch node via low-inductance path |
| GND | Power Ground | Common return for input cap, output cap, and IC substrate; ties to exposed pad |
| SW | Switch Node | Drain of internal high-side MOSFET; connects to inductor and catch diode/anode |
| BOOT | Bootstrap Supply | Provides gate drive voltage for high-side MOSFET via external 0.1µF ceramic capacitor |
| FB | Feedback Input | Monitors regulated 3.3V output via internal 3.3V reference divider; no external resistors required |
| SD | Shutdown Control | TTL-compatible active-low enable (0.75–1.28V threshold); pulls internal bias off when low |
| COMP | Error Amplifier Output | Internal transconductance amplifier output; used for loop compensation if needed (fixed version has internal compensation) |
| SS | Soft-Start Timing | Connects to external capacitor to program startup ramp time and limit inrush current |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ MOSFET | Enables >85% efficiency at 1.5A/3.3V with minimal external components and board area |
| Current-mode control | Delivers fast transient response (<10µs recovery) and inherent cycle-by-cycle current limiting |
| Programmable soft-start | Prevents input voltage droop and output overshoot via external SS capacitor (e.g., 1nF = ~2ms ramp) |
| Frequency foldback | Reduces switching frequency under overload or startup to limit peak inductor current and thermal stress |
| Thermal & short-circuit protection | Auto-recovery shutdown triggers at 150°C junction temp or sustained overcurrent (>3.2A) |
Applications
| LCD Monitor Power Supply | Set-Top Box Core Logic Rail |
|---|---|
Use Scenario: Local 3.3V rail generation from 12V main supply for display timing controller and interface logic. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V at up to 1.5A with tight line/load regulation. Use Value: Eliminates need for external feedback resistors and compensation network, reducing BOM count by 4–6 passives. | Use Scenario: Powering MPEG decoder SoC core logic and HDMI PHY interface in consumer STB designs. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with fast transient response to handle burst-mode CPU loads. Use Value: Maintains <±1.5% output deviation during 1A step load changes due to current-mode architecture and 500kHz switching. |
| Cable Modem Downconverter | Distributed 12V-to-3.3V Local Regulation |
Use Scenario: Generating clean 3.3V for DOCSIS-compliant RF front-end and upstream transmitter ICs. IC Role / Device Role / Timing Role: Isolated local regulator with low EMI profile and thermal robustness in dense RF layout. Use Value: Achieves <10mVpp output ripple with standard 22µF ceramic output capacitor, meeting RF subsystem noise floor requirements. | Use Scenario: Compact 3.3V rail in industrial I/O modules where space and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Fixed-output buck converter operating across −40°C to +125°C ambient with no derating. Use Value: Delivers full 1.5A output at 85°C ambient using only 1in² PCB copper area, validated per θJA = 130°C/W spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3.5A rated, 2.95–6V input, requires external feedback resistors for 3.3V output | Better suited for higher-current or lower-input-voltage systems; lacks integrated 3.3V reference | Choose when >1.5A load or <8.5V input is required; adds 2 resistors and compensation tuning |
| MP2315DJ-LF-Z | 1.5A, 4.5–28V input, fixed 3.3V option, but uses SOT-23-6 package (no exposed pad) | Smaller footprint but higher thermal resistance (θJA ≈ 200°C/W); limited to ≤1A continuous in same PCB area | Choose for ultra-compact layouts where thermal margin allows; not drop-in for TSSOP-16 thermal design |
Compared with TPS54332DR and MP2315DJ-LF-Z, the LM1572MTCX-3.3/NOPB provides guaranteed 1.5A output in TSSOP-16 with zero external feedback components and superior thermal performance on standard PCBs-making it optimal for cost-sensitive, space-constrained 12V-to-3.3V conversions.
Availability
LM1572MTCX-3.3/NOPB is available at Aetrix Electronics and suitable for LCD monitors, set-top boxes, and cable modems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM1572MTCX-3.3/NOPB 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 (TI) acquired National Semiconductor in 2011 and maintains legacy product support, quality assurance, and documentation for analog power ICs like the LM1572 series.
The LM1572 belongs to TI's legacy buck regulator portfolio targeting cost-effective, compact DC/DC conversion in consumer electronics-designed specifically for reliable 12V-to-3.3V/5V local regulation without external feedback or compensation.
FAQ
What is the input voltage range supported by the LM1572MTCX-3.3/NOPB?
The LM1572MTCX-3.3/NOPB operates with an input voltage range of 8.5V to 16V. This range ensures compatibility with standard 12V distributed power rails while maintaining sufficient headroom for regulation across temperature and load. Operation below 8.5V may cause undervoltage lockout activation, and exceeding 16V risks absolute maximum rating violation. The LM1572MTCX-3.3/NOPB is not rated for automotive 24V systems or unregulated wall adapters without pre-regulation.
Does the LM1572MTCX-3.3/NOPB require external feedback resistors to set its output voltage?
No, the LM1572MTCX-3.3/NOPB features a factory-trimmed internal resistor divider that fixes the output to 3.3V, so no external feedback resistors are needed. The FB pin is internally connected to this divider, simplifying layout and reducing BOM count. This differs from the adjustable LM1572 variant, which requires two external resistors. The LM1572MTCX-3.3/NOPB maintains ±3% output accuracy across temperature and load without user calibration.
How does the soft-start function work on the LM1572MTCX-3.3/NOPB?
The LM1572MTCX-3.3/NOPB implements programmable soft-start via the SS pin, which sources a constant 2.5–8µA current to charge an external capacitor. The resulting voltage ramp controls the COMP pin reference, gradually increasing duty cycle to limit inrush current. A typical 1nF capacitor yields ~2ms startup time. This prevents input rail sag and output overshoot during power-up. The LM1572MTCX-3.3/NOPB does not support disabling soft-start; it is always active on power application.
What thermal considerations apply to the LM1572MTCX-3.3/NOPB in continuous 1.5A operation?
At 1.5A output and 12V input, the LM1572MTCX-3.3/NOPB dissipates ~1.2W (calculated from RDS(on) and switching losses). With θJA = 130°C/W and 25°C ambient, junction temperature rises ~156°C-exceeding the 150°C absolute max. Therefore, full 1.5A load requires ≥1in² copper pour and airflow or derating above 60°C ambient. The LM1572MTCX-3.3/NOPB includes thermal shutdown at 150°C with auto-recovery, but sustained operation near limit reduces reliability.
Is the LM1572MTCX-3.3/NOPB pin-compatible with other fixed-output versions like the LM1572MTCX-5.0/NOPB?
Yes, the LM1572MTCX-3.3/NOPB and LM1572MTCX-5.0/NOPB share identical TSSOP-16 pinout, electrical interface, and package dimensions. Only the internal feedback divider differs-so they are direct drop-in replacements for different output voltages. No PCB layout change is needed when swapping between 3.3V and 5V fixed variants. The LM1572MTCX-3.3/NOPB retains identical shutdown, soft-start, and protection behavior regardless of output voltage option.
LM1572MTCX-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
LM1572MTCX-3.3/NOPB FAQ
1.How can I place an order for LM1572MTCX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM1572MTCX-3.3/NOPB 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 LM1572MTCX-3.3/NOPB reliable?
The price and inventory of LM1572MTCX-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM1572MTCX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM1572MTCX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM1572MTCX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM1572MTCX-3.3/NOPB?
LM1572MTCX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM1572MTCX-3.3/NOPB 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 LM1572MTCX-3.3/NOPB?
For technical support, including LM1572MTCX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM1572MTCX-3.3/NOPB requirements.
6.How does Aetrix verify that LM1572MTCX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM1572MTCX-3.3/NOPB 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 LM1572MTCX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM1572MTCX-3.3/NOPB?
All LM1572MTCX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM1572MTCX-3.3/NOPB, 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 LM1572MTCX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM1572MTCX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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