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Texas Instruments LM1572MTC-ADJ/NOPB
- Part No.:
- LM1572MTC-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM1572MTC-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,847
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Product details
Overview
LM1572MTC-ADJ/NOPB from Texas Instruments (formerly National Semiconductor) is a 500kHz current-mode synchronous buck regulator with internal 150mΩ MOSFET switch, delivering up to 1.5A output current, adjustable output voltage from 2.42V to 5V, and 26µA shutdown supply current - used in LCD monitor power rails and set-top box local DC/DC conversion.
For engineers reviewing the LM1572MTC-ADJ/NOPB datasheet, LM1572MTC-ADJ/NOPB pinout, LM1572MTC-ADJ/NOPB application, or LM1572MTC-ADJ/NOPB equivalent, key selection criteria include feedback voltage tolerance (±2.5% at 2.42V), cycle-by-cycle current limit (2.7A typ), thermal protection, TSSOP-16 package footprint, and soft-start programmability via external capacitor.
Technical Context
This IC implements fixed-frequency current-mode control with internal slope compensation and cycle-by-cycle peak current limiting. Its error amplifier features 350 V/V gain and 1100–3200 µ℧ transconductance, enabling stable regulation across line (8.5–16V input) and load (0–1.5A) variations.
The controller integrates undervoltage lockout (2.38V threshold), TTL-compatible shutdown (1.0V logic high), and frequency foldback during overcurrent events (20–160kHz shift). Output voltage is set via external resistor divider connected to FB pin, referenced to 2.42V nominal feedback voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5A continuous - supports mid-power digital subsystems without external boost stages |
| Switching Frequency | 500kHz typ - enables compact 1–2.2µH inductors and low-ESR ceramic output capacitors |
| Feedback Voltage | 2.42V ±2.5% - sets output range 2.42V–5V using standard resistor tolerances |
| Shutdown Current | 26µA max - meets low-power standby requirements in consumer electronics |
| Input Voltage Range | 8.5V to 16V - compatible with 12V distributed bus architectures |
| Current Limit | 2.7A typ - provides margin above 1.5A load for transient surges and startup |
| Thermal Resistance | 130°C/W (θJA) - requires ≥1in² copper pour for full 1.5A operation at +125°C ambient |
Pinout & Package
TSSOP-16 (NS Package Number MTC16), thermally enhanced with exposed die pad (pin 16 tied to GND for optimal heat dissipation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply | Accepts 8.5–16V; decoupling required within 5mm of pin |
| GND | Power and signal ground | Common return for switch, error amp, and FB network; connects to exposed pad |
| SW | Switch node | Drives external inductor; high di/dt path requiring tight layout |
| FB | Feedback input | Resistor-divider reference point; 0.5µA bias current affects high-R divider accuracy |
| COMP | Error amplifier output | Compensates loop stability; external RC network sets pole/zero placement |
| SD | Shutdown control | TTL-compatible active-low enable; 1.0V threshold ensures noise immunity |
| SS | Soft-start timing | Capacitor-connected pin; sets output ramp time and inrush current limit |
| BOOT | High-side gate drive | Requires 0.1µF ceramic capacitor between BOOT and SW for MOSFET gate charge |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sense resistor |
| Programmable soft-start | External capacitor on SS pin controls output voltage ramp rate, preventing input inrush and output overshoot |
| Internal slope compensation | Eliminates subharmonic oscillation at duty cycles >50%, ensuring stable operation across full load range |
| Thermal and short-circuit protection | Auto-recovery shutdown triggers at junction temperature >150°C or sustained overcurrent, protecting PCB and load |
| TTL-compatible shutdown | Direct interface with microcontroller GPIOs without level-shifting; 26µA shutdown current minimizes system leakage |
Applications
| LCD Monitor Power Supply | Set-Top Box Core Rail |
|---|---|
Use Scenario: Generating 3.3V or 5V from 12V input for LCD panel logic and timing controllers. IC Role / Device Role / Timing Role: Primary step-down regulator supplying main digital subsystem power. Use Value: 500kHz switching allows small 1.5µH inductors and reduces EMI filtering burden versus lower-frequency alternatives. | Use Scenario: Local DC/DC conversion for SoC I/O and memory interfaces in cable/satellite receivers. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting multiple voltage domains (e.g., 2.5V, 3.3V). Use Value: 2.42V feedback reference enables precise output setting with 1% resistors, reducing calibration overhead. |
| Cable Modem PHY Power | Distributed System Down-Conversion |
Use Scenario: Providing clean 5V rail for DOCSIS-compliant RF front-end and Ethernet PHY ICs. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator isolating noise-sensitive analog sections from digital switching noise. Use Value: 150mΩ internal MOSFET achieves >90% efficiency at 1A/5V, minimizing thermal load in sealed enclosures. | Use Scenario: Converting 12V bus to 3.3V/5V for remote sensor nodes or peripheral modules. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator eliminating need for external high-side switch and driver. Use Value: TSSOP-16 footprint (5mm × 4.4mm) saves board space versus discrete controller + MOSFET solutions. |
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, 5.5–36V input, no integrated BOOT capacitor requirement | Higher input voltage range and output current; larger SO-8 package | Preferred when input exceeds 16V or load exceeds 1.5A |
| MP2307DN-LF-Z | 2A rated, 340kHz, 4.75–23V input, 120mΩ RDS(on), no SS pin | Lower quiescent current (250µA), but lacks programmable soft-start and foldback | Selected for cost-sensitive, non-sequenced systems where inrush control is less critical |
Compared with TPS5430DDAR and MP2307DN-LF-Z, the LM1572MTC-ADJ/NOPB offers tighter feedback tolerance (±2.5% vs ±3%), integrated slope compensation, and dedicated soft-start control - making it preferable for noise-sensitive, multi-rail consumer displays requiring precise voltage sequencing.
Availability
LM1572MTC-ADJ/NOPB is available at Aetrix Electronics and suitable for LCD monitors, set-top boxes, and cable modems requiring stable component supply, long-term industrial availability, and RoHS-compliant packaging.
Supply support for LM1572MTC-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 its high-performance analog portfolio, including legacy power management ICs with proven reliability in consumer and industrial applications.
The LM1572 belongs to National's legacy buck regulator family designed for space-constrained, medium-current DC/DC conversion in display and broadband equipment - emphasizing integration, thermal robustness, and ease of loop compensation.
FAQ
What is the minimum recommended input voltage for stable operation of LM1572MTC-ADJ/NOPB?
The LM1572MTC-ADJ/NOPB requires a minimum input voltage of 8.5V to maintain internal bias regulation and stable oscillator operation. Below this, UVLO activates at 2.38V threshold, disabling switching. For 2.42V output, practical minimum VIN is ~4.5V due to duty cycle limits, but datasheet specifies 8.5V as guaranteed operating minimum under all conditions. Always verify duty cycle constraints per application using D = VOUT / (VIN × η).
How is output voltage set on LM1572MTC-ADJ/NOPB?
The LM1572MTC-ADJ/NOPB uses a resistor divider from output to FB pin and from FB to GND. With 2.42V nominal feedback voltage, VOUT = 2.42V × (1 + R1/R2). Standard 1% resistors yield ≤±3% total output error. Layout must minimize trace impedance to FB pin, as its 0.5µA bias current interacts with parasitic resistance.
Does LM1572MTC-ADJ/NOPB require an external bootstrap capacitor?
Yes, LM1572MTC-ADJ/NOPB requires a 0.1µF ceramic capacitor between BOOT and SW pins to sustain high-side MOSFET gate drive. This capacitor must be placed within 3mm of the pins with low-inductance routing. Omission causes erratic switching or failure to start, especially under heavy load or low input voltage.
What thermal derating applies to LM1572MTC-ADJ/NOPB at elevated ambient temperatures?
With θJA = 130°C/W and TJ(MAX) = 150°C, LM1572MTC-ADJ/NOPB delivers full 1.5A only up to ~70°C ambient on a 1in² copper board. At 100°C ambient, maximum continuous current drops to ~0.9A. Derating curves are provided in Figure 12 of the official datasheet; forced airflow or thermal vias improve performance.
Can LM1572MTC-ADJ/NOPB be synchronized to an external clock?
No, LM1572MTC-ADJ/NOPB operates at a fixed 500kHz internal oscillator frequency and does not support external synchronization. Frequency foldback occurs only during overcurrent events. For synchronizable alternatives, consider TI's TPS5430 or MPS MP2307, which offer SYNC pin functionality.
LM1572MTC-ADJ/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:
- 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
LM1572MTC-ADJ/NOPB FAQ
1.How can I place an order for LM1572MTC-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM1572MTC-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 LM1572MTC-ADJ/NOPB reliable?
The price and inventory of LM1572MTC-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 LM1572MTC-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM1572MTC-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM1572MTC-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM1572MTC-ADJ/NOPB?
LM1572MTC-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM1572MTC-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 LM1572MTC-ADJ/NOPB?
For technical support, including LM1572MTC-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM1572MTC-ADJ/NOPB requirements.
6.How does Aetrix verify that LM1572MTC-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM1572MTC-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 LM1572MTC-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM1572MTC-ADJ/NOPB?
All LM1572MTC-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM1572MTC-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 LM1572MTC-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM1572MTC-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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