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Texas Instruments LM1572MTC-5.0/NOPB
- Part No.:
- LM1572MTC-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM1572MTC-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,012
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Product details
Overview
LM1572MTC-5.0/NOPB from Texas Instruments (formerly National Semiconductor) is a fixed 5V, 500kHz synchronous step-down DC/DC regulator with integrated 150mΩ MOSFET switch, delivering up to 1.5A load current, operating from 8.5V–16V input, and featuring TTL-compatible shutdown and 26µA shutdown current - used in LCD monitor power rails.
For engineers reviewing the LM1572MTC-5.0/NOPB datasheet, LM1572MTC-5.0/NOPB pinout, LM1572MTC-5.0/NOPB application, or LM1572MTC-5.0/NOPB equivalent, key selection criteria include guaranteed 1.5A output, fixed 5V feedback voltage (4.85–5.2V), TSSOP-16 thermal resistance (130°C/W), soft-start programmability, and cycle-by-cycle current limiting for robust local regulation.
Technical Context
This buck controller uses current-mode control architecture with internal slope compensation and cycle-by-cycle peak current limiting, enabling stable operation across wide line/load transients. Its 500kHz switching frequency supports compact external LC filtering using standard 0805/1206 inductors and ceramic capacitors.
The device integrates a high-side N-channel MOSFET with 0.15Ω typical RDS(on), operates with undervoltage lockout (2.2–2.5V threshold), and features frequency foldback during overload - reducing switching losses when FB pin voltage drops below regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (VFB = 4.85–5.2V); no external resistor divider required |
| Max Output Current | 1.5A continuous; limited by thermal resistance (130°C/W) and RDS(on) (0.15Ω typ) |
| Switching Frequency | 400–570kHz (typ 500kHz); enables use of ≤2.2µH inductors and low-ESR ceramics |
| Input Voltage Range | 8.5V to 16V; supports 12V distributed bus with margin for ripple and drop |
| Shutdown Current | 26µA max; enables low-power standby in set-top box or cable modem sleep modes |
| Thermal Resistance | 130°C/W (Junction-to-Ambient, TSSOP-16 on 1in² copper); requires minimal heatsinking |
| Current Limit | 2.0–3.2A (cycle-by-cycle); protects against short-circuit while sustaining 1.5A nominal |
Pinout & Package
TSSOP-16 (NS Package Number MTC16), thermally enhanced with exposed pad; 5mm × 4.4mm footprint, 1.2mm height, 0.65mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply (8.5–16V); connects to bulk capacitor and feeds internal bias and switch |
| GND | Power Ground | Common return for switch, control logic, and thermal pad; must be low-impedance plane |
| SW | Switch Node | Drain of internal high-side MOSFET; connects directly to inductor and catch diode/capacitor |
| FB | Feedback Input | Monitors regulated 5V output via internal resistor divider; open for fixed 5V mode |
| COMP | Error Amplifier Output | Transconductance amplifier output driving PWM comparator; sets duty cycle dynamically |
| SD | Shutdown Control | TTL-compatible active-low enable; <1.28V disables regulator, drawing only 26µA |
| SS | Soft-Start Timing | Capacitor-connected pin controlling startup ramp rate; prevents inrush into downstream capacitance |
| BOOT | Bootstrap Supply | Provides gate drive voltage for high-side MOSFET; requires 0.1µF ceramic between BOOT and SW |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ MOSFET | Eliminates external high-side switch; reduces BOM count and layout area vs discrete controllers |
| Current-mode control | Enables fast transient response to load steps (e.g., LCD backlight dimming bursts) without external compensation |
| Programmable soft-start | Prevents input voltage sag and output overshoot during power-up via external SS capacitor timing |
| Frequency foldback | Reduces switching frequency under overload (e.g., shorted output), lowering power dissipation and thermal stress |
| TTL-compatible shutdown | Allows direct interfacing with microcontroller GPIOs without level-shifting; supports system-level sequencing |
Applications
| LCD Monitor Power Rail | Set-Top Box Core Logic Supply |
|---|---|
Use Scenario: Providing clean, regulated 5V to LCD panel timing controllers and interface ICs in 24/7 operation. IC Role / Device Role / Timing Role: Primary local DC/DC converter stepping down 12V bus to fixed 5V at up to 1.5A. Use Value: High efficiency (>88% at 1A) and thermal robustness (130°C/W) ensure reliability in enclosed chassis with limited airflow. | Use Scenario: Powering SoC I/O banks and USB PHYs in consumer STBs where standby current matters. IC Role / Device Role / Timing Role: Always-on 5V rail generator with 26µA shutdown current enabling quick wake-from-sleep. Use Value: TTL shutdown allows precise coordination with main processor reset sequence, avoiding brown-out during boot. |
| Cable Modem Downconverter | Distributed 12V-to-5V Local Regulation |
Use Scenario: Converting 12V front-panel supply to stable 5V for DOCSIS-compliant RF front-end ICs. IC Role / Device Role / Timing Role: Immune-to-noise buck regulator with cycle-by-cycle current limit protecting sensitive RF stages. Use Value: 500kHz switching avoids interference in 5–100MHz upstream bands; ESD tolerance (2kV HBM) withstands handling. | Use Scenario: Point-of-load conversion in industrial embedded systems with 12V backplane distribution. IC Role / Device Role / Timing Role: Compact, self-contained step-down stage replacing linear regulators to reduce heat and improve efficiency. Use Value: TSSOP-16 package fits tight board spaces; internal MOSFET removes need for external driver/layout tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS5430DDAR | 3A rated, 500kHz, adjustable output only; requires external feedback resistors; higher quiescent current (5.5mA) | Supports wider output range (1.22–30V); less suitable for fixed 5V space-constrained designs | Choose if higher current headroom or adjustable VOUT needed; avoid if pin compatibility or fixed 5V simplicity is critical |
| MP2307DN-LF-Z | 1.2A rated, 340kHz, fixed 5V; lower cost; no soft-start programming; 100µA shutdown current | Limited to lighter loads; lacks programmable soft-start and foldback protection | Acceptable for cost-sensitive, non-critical 5V rails where 1.2A suffices and thermal margin is ample |
Compared with TPS5430DDAR and MP2307DN-LF-Z, the LM1572MTC-5.0/NOPB delivers exact 5V output without external resistors, superior thermal performance (130°C/W vs ≥150°C/W), and tighter shutdown current (26µA), making it optimal for space- and efficiency-constrained 1.5A applications.
Availability
LM1572MTC-5.0/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 consistent parametric performance across production batches.
Supply support for LM1572MTC-5.0/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 its analog power portfolio with full datasheet, simulation model, and application note continuity.
The LM1572 series was designed specifically for compact, high-efficiency local DC/DC conversion in consumer video and broadband equipment - emphasizing small size, low standby loss, and robust overload behavior.
FAQ
What is the guaranteed output voltage tolerance of the LM1572MTC-5.0/NOPB?
The LM1572MTC-5.0/NOPB provides a fixed 5.0V output with guaranteed feedback voltage range of 4.85V to 5.2V (±2%) over temperature and line conditions. This specification is confirmed in the Electrical Characteristics table under VFB_5 parameter and applies across the full operating junction temperature range (−40°C to +125°C) and input voltage range (8.5V–16V).
Does the LM1572MTC-5.0/NOPB require external components for fixed 5V operation?
No, the LM1572MTC-5.0/NOPB does not require external feedback resistors for fixed 5V operation. Its internal resistor divider sets the reference, and the FB pin is left unconnected. Only input/output capacitors, an inductor, BOOT capacitor, and optional soft-start capacitor are needed - simplifying design versus adjustable variants like LM1572MTC/NOPB.
What thermal derating applies to the LM1572MTC-5.0/NOPB at 1.5A load?
At 1.5A continuous load, the LM1572MTC-5.0/NOPB dissipates approximately 0.34W (based on RDS(on) = 0.15Ω and duty cycle ~42%). With θJA = 130°C/W, junction temperature rise is ~44°C above ambient. Derating begins above 85°C ambient; full 1.5A is guaranteed only up to 85°C ambient with proper PCB copper area per datasheet layout guidelines.
Can the LM1572MTC-5.0/NOPB be synchronized to an external clock?
No, the LM1572MTC-5.0/NOPB does not support external synchronization. Its oscillator is internally fixed at 500kHz (400–570kHz over temp) with no SYNC pin or frequency adjustment capability. For synchronizable alternatives, consider TI's TPS54302 or MPS MP2451, which offer external clock input functionality.
Is the LM1572MTC-5.0/NOPB RoHS compliant and lead-free?
Yes, the LM1572MTC-5.0/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free packaging per JEDEC J-STD-609, and Texas Instruments' official product change notices confirm Pb-free matte tin lead finish on the TSSOP-16 package with NiPdAu underplate.
LM1572MTC-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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):
- 5V
- 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
LM1572MTC-5.0/NOPB FAQ
1.How can I place an order for LM1572MTC-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM1572MTC-5.0/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 LM1572MTC-5.0/NOPB reliable?
The price and inventory of LM1572MTC-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM1572MTC-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM1572MTC-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM1572MTC-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM1572MTC-5.0/NOPB?
LM1572MTC-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM1572MTC-5.0/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 LM1572MTC-5.0/NOPB?
For technical support, including LM1572MTC-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM1572MTC-5.0/NOPB requirements.
6.How does Aetrix verify that LM1572MTC-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM1572MTC-5.0/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 LM1572MTC-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM1572MTC-5.0/NOPB?
All LM1572MTC-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM1572MTC-5.0/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 LM1572MTC-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM1572MTC-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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