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Texas Instruments LM1572MTCX-ADJ/NOPB
- Part No.:
- LM1572MTCX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM1572MTCX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,397
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Product details
Overview
LM1572MTCX-ADJ/NOPB from Texas Instruments (formerly National Semiconductor) is a 500kHz current-mode synchronous buck regulator with integrated 150mΩ high-side MOSFET, delivering up to 1.5A output current, adjustable output voltage from 2.42V to 5V via external resistor divider, and 26µA shutdown supply current. It targets space-constrained local DC/DC conversion in LCD monitors and set-top boxes.
For engineers reviewing the LM1572MTCX-ADJ/NOPB datasheet, LM1572MTCX-ADJ/NOPB pinout, LM1572MTCX-ADJ/NOPB application, or LM1572MTCX-ADJ/NOPB equivalent, key selection criteria include its TSSOP-16 package footprint, programmable soft-start timing, frequency foldback behavior under overload, and feedback pin bias current of ≤1.5µA at regulation.
Technical Context
This regulator uses peak-current-mode control with internal slope compensation to ensure stability across wide duty-cycle and input-voltage ranges. Its 500kHz fixed switching frequency enables compact external LC filter design using standard 10–22µF ceramic output capacitors and 1–4.7µH shielded inductors.
The device integrates a high-side DMOS power switch with 0.15Ω typical RDS(on), operates from 8.5V to 16V input, and features undervoltage lockout (2.38V threshold), TTL-compatible shutdown (1.0V logic-high threshold), and cycle-by-cycle overcurrent protection triggering at 2.7A typical switch current limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1.5A continuous load capability with thermal derating above 85°C ambient |
| Switching Frequency | 500kHz nominal; ±14% variation over full temperature range supports predictable EMI filtering |
| Feedback Voltage | 2.42V nominal at FB pin; sets output via R1/R2 divider with ±2% tolerance over temp |
| Shutdown Current | 26µA max; enables ultra-low-power system sleep states without auxiliary LDO |
| RDS(on) | 0.15Ω typical; reduces conduction loss and thermal stress at 1.5A output |
| Input Voltage Range | 8.5V to 16V; compatible with 12V distributed rails in consumer AV equipment |
| Soft-Start Current | 4.5µA typical at SS pin; determines ramp time when paired with external capacitor |
Pinout & Package
TSSOP-16 (NS Package Number MTC16), thermally enhanced with exposed pad for PCB heat sinking; 5mm × 4.4mm footprint, 1.2mm height, 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to 8.5–16V source; bypass with ≥10µF ceramic capacitor near pin |
| GND | Power ground | Common return for power switch, control circuitry, and thermal pad connection |
| SW | Switch node | Drives external inductor; requires low-inductance layout to minimize ringing |
| FB | Feedback input | Senses output voltage via resistor divider; high-impedance (≤1.5µA bias) node |
| COMP | Error amplifier output | Provides transconductance-controlled signal (gm = 2000µ℧ typ) to PWM comparator |
| SD | Shutdown control | TTL-compatible digital input; <1.0V disables regulator, >1.28V enables operation |
| SS | Soft-start timing | Current-sink pin (4.5µA typ); sets output ramp time with external capacitor to ground |
| BOOT | Bootstrap supply | Connects to SW through 0.1µF ceramic; powers high-side gate driver during on-time |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response to load steps and inherent cycle-by-cycle overcurrent limiting |
| Programmable soft-start | Prevents input inrush and output overshoot by controlling startup dV/dt via external capacitor |
| Frequency foldback | Reduces switching frequency under overload to maintain regulation and limit power dissipation |
| Thermal shutdown | Activates at 150°C junction temperature and latches off until thermal recovery |
| Internal slope compensation | Eliminates subharmonic oscillation at duty cycles >50% without external components |
Applications
| LCD Monitor Power Supply | Set-Top Box Core Rail |
|---|---|
Use Scenario: Local 3.3V or 5V rail generation from 12V main supply in slim-panel LCD monitor designs. IC Role / Device Role / Timing Role: Primary step-down regulator supplying logic and interface ICs on display timing controller board. Use Value: 1.5A output and 500kHz switching enable compact 2-layer PCB layout with minimal external component count. | Use Scenario: Point-of-load conversion for MPEG decoder, demodulator, and memory subsystems in cable/satellite STBs. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 12V intermediate bus to generate stable 3.3V core voltage. Use Value: Adjustable output allows precise tuning to meet tight 3.3V ±3% tolerance requirements of SoC power domains. |
| Cable Modem Down Conversion | Distributed System Local Regulator |
Use Scenario: Generating 5V USB host port power and 3.3V PHY voltage from shared 12V input in DOCSIS-compliant modems. IC Role / Device Role / Timing Role: Dual-rail capable regulator supporting multiple downstream loads with independent sequencing via SD pin. Use Value: TTL-compatible shutdown enables coordinated power-up/down with upstream controller and USB enumeration logic. | Use Scenario: Local 2.42–5V adjustable rail in industrial I/O modules powered from 12V or 24V backplane. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC stage replacing linear regulators to improve efficiency and reduce heat buildup. Use Value: 130°C/W θJA and exposed thermal pad allow reliable 1.5A operation on standard FR-4 without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-ADJ/NOPB | 3.3A output, 260kHz switching, SO-8 package; higher current but larger inductors required | Better suited for higher-power applications where 500kHz EMI constraints are relaxed | Select when >1.5A load or lower switching loss dominates over size constraints |
| TPS5430DDAR | 3A output, 500kHz, SO-8; no integrated BOOT diode, requires external bootstrap capacitor | Requires additional external component but offers higher current and same frequency | Choose when needing 3A capability and willing to add one 0.1µF capacitor |
Compared with LM2678-ADJ/NOPB and TPS5430DDAR, the LM1572MTCX-ADJ/NOPB delivers optimal balance of 1.5A capability, 500kHz operation, and TSSOP-16 footprint-making it preferred for space-limited consumer AV systems where thermal management and EMI control are critical.
Availability
LM1572MTCX-ADJ/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-ADJ/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 acquired National Semiconductor in 2011 and maintains legacy analog power product lines including the LM1572 series.
The LM1572 belongs to TI's legacy integrated buck regulator family designed for cost-sensitive, space-constrained consumer electronics requiring high-frequency, high-efficiency local DC/DC conversion.
FAQ
What is the minimum input voltage required for LM1572MTCX-ADJ/NOPB to regulate a 3.3V output?
The LM1572MTCX-ADJ/NOPB requires ≥8.5V input to maintain regulation across temperature and load. At 3.3V output, the minimum practical input is determined by the maximum duty cycle limit (86%) and internal bias requirements-not just VOUT/DMAX. Below 8.5V, UVLO activates and disables switching. The device will not regulate at inputs below this threshold even with light load.
Does LM1572MTCX-ADJ/NOPB require an external bootstrap diode?
No, the LM1572MTCX-ADJ/NOPB integrates the bootstrap diode internally. Only a 0.1µF ceramic capacitor between BOOT and SW pins is required to charge the high-side gate driver. This eliminates discrete diode placement and associated parasitic inductance, improving reliability and reducing bill-of-materials count.
How does frequency foldback operate in LM1572MTCX-ADJ/NOPB during overload?
In LM1572MTCX-ADJ/NOPB, frequency foldback reduces switching frequency from 500kHz to as low as 400kHz when FB pin voltage drops below 0.8V-indicating severe overload or short-circuit condition. This action limits average switch current and power dissipation while maintaining regulation, preventing thermal runaway without immediate shutdown.
What is the recommended output capacitor ESR for stable operation of LM1572MTCX-ADJ/NOPB?
The LM1572MTCX-ADJ/NOPB is optimized for low-ESR ceramic output capacitors (e.g., X5R/X7R, 10–22µF). ESR should be ≤10mΩ to ensure phase margin >45° and avoid subharmonic oscillation. Higher ESR (e.g., tantalum or electrolytic) degrades transient response and may cause instability, especially at light loads.
Can LM1572MTCX-ADJ/NOPB be used with a 24V input?
No-LM1572MTCX-ADJ/NOPB has an absolute maximum input voltage rating of 17V and guaranteed operating range of 8.5V to 16V. Applying 24V exceeds both limits and risks permanent damage. For 24V input, consider TI's LM2678 or TPS5430 series, which support up to 40V input.
LM1572MTCX-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 5V
- 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-ADJ/NOPB FAQ
1.How can I place an order for LM1572MTCX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM1572MTCX-ADJ/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-ADJ/NOPB reliable?
The price and inventory of LM1572MTCX-ADJ/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-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM1572MTCX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM1572MTCX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM1572MTCX-ADJ/NOPB?
LM1572MTCX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM1572MTCX-ADJ/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-ADJ/NOPB?
For technical support, including LM1572MTCX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM1572MTCX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM1572MTCX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM1572MTCX-ADJ/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-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM1572MTCX-ADJ/NOPB?
All LM1572MTCX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM1572MTCX-ADJ/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-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM1572MTCX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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