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Texas Instruments LM5574Q0MT/NOPB
- Part No.:
- LM5574Q0MT/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5574Q0MT/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,357
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Product details
Overview
LM5574Q0MT/NOPB from Texas Instruments is a 75V-input, 0.5A synchronous step-down switching regulator with integrated 750mΩ N-channel MOSFET, emulated current-mode control, and adjustable 50–500kHz switching frequency. It delivers stable output down to 1.225V with 1.5% feedback reference accuracy and supports industrial power bus applications requiring high-voltage DC-DC conversion.
For engineers reviewing the LM5574Q0MT/NOPB datasheet, LM5574Q0MT/NOPB pinout, LM5574Q0MT/NOPB application, or LM5574Q0MT/NOPB equivalent, key selection criteria include input voltage range (6–75V), cycle-by-cycle current limiting, thermal shutdown, soft-start programmability, and SYNC-capable multi-device synchronization for EMI-sensitive systems.
Technical Context
The LM5574Q0MT/NOPB implements emulated current-mode control using a reconstructed ramp signal derived from VIN–VOUT and a diode-current sample-and-hold circuit-eliminating leading-edge spikes and enabling reliable operation at very low duty cycles. Its dual-mode VCC regulator maintains ~7V bias across 6–75V input, with internal UVLO (5.35V) and shutdown thresholds (0.7V/1.225V).
Frequency is set via RT-to-AGND resistor (50–500kHz); SYNC pin enables master-slave synchronization of multiple devices or external clock locking. Protection includes cycle-by-cycle current limit (0.7A typ), thermal shutdown (165°C), remote shutdown, and forced 500ns off-time for bootstrap recharge and diode current sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 75V - supports wide industrial and telecom bus voltages without pre-regulation |
| Output Current | 0.5A continuous - sufficient for point-of-load regulation in distributed power architectures |
| Feedback Reference | 1.225V ±1.5% - enables precise output setting down to 1.225V with minimal external components |
| Switching Frequency | 50kHz to 500kHz - adjustable via single RT resistor for size/efficiency trade-off optimization |
| Integrated MOSFET Rds(on) | 750mΩ (max 1500mΩ) - reduces external component count and conduction losses in high-VIN buck stages |
| Thermal Shutdown | 165°C with 25°C hysteresis - ensures safe operation under overload or poor heatsinking conditions |
| Soft-Start Current | 10µA (7–14µA range) - controls ramp rate of external SS capacitor for controlled inrush current |
Pinout & Package
LM5574Q0MT/NOPB is housed in a 16-pin TSSOP package (5mm × 6.4mm, 0.65mm pitch) with exposed thermal pad for enhanced thermal performance in industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 6–75V unregulated supply; feeds internal start-up regulator and high-side switch |
| VCC | Bias supply output | Provides ~7V regulated bias (≤9V VIN) or direct VIN pass-through (<9V); requires 0.1–1µF decoupling |
| SW | Switching node | Source of internal N-MOSFET; connects to inductor and external Schottky diode anode |
| BST | Bootstrap supply input | Connects to SW via 0.022µF ceramic capacitor to enable high-side gate drive during on-time |
| FB | Feedback input | Senses output voltage divider; referenced to 1.225V internal precision bandgap |
| COMP | Error amplifier output | Interface for external Type II compensation network between COMP and FB pins |
| RT | Frequency set input | Resistor-to-AGND sets oscillator frequency (50–500kHz); placement critical for stability |
| SS | Soft-start control | 10µA current source charges external capacitor to ramp reference voltage linearly at startup |
| SYNC | Oscillator sync I/O | Enables multi-device synchronization or external clock locking; open-drain compatible |
| SD | Shutdown input | 0.7V threshold disables regulator; 1.225V enables operation; internal 5µA pullup if floating |
| RAMP | Emulated current ramp | External capacitor sets slope; current source scales with (VIN–VOUT) for accurate current reconstruction |
| IS | Diode current sense | Connects to Schottky diode anode; samples recirculating current for DC level of emulated ramp |
| PGND | Power ground | Low-side return for IS sense resistor and buck switch; separate from AGND for noise isolation |
| AGND | Analog ground | Reference for FB, COMP, RT, RAMP, and internal error amplifier; must be star-connected |
| PRE | Pre-charge assist | Open-drain output tied to SW to boost BST capacitor charge during light-load or pre-biased conditions |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode architecture | Eliminates current-sense noise and propagation delay, enabling stable regulation at <10% duty cycle in high-VIN/low-VOUT applications |
| Integrated 75V/750mΩ N-MOSFET | Reduces BOM count and layout complexity while maintaining 0.5A output capability without external switch |
| Adjustable soft-start (SS pin) | 10µA current source + external capacitor allows precise control of output voltage ramp time and inrush current |
| Multi-device SYNC capability | Allows up to five LM5574Q0MT/NOPB units to synchronize via shared SYNC net-reducing beat frequencies and EMI peaks |
| Robust protection suite | Includes cycle-by-cycle current limit (0.7A), thermal shutdown (165°C), UVLO on VCC and SD, and forced 500ns off-time for reliability |
Applications
| Industrial Power Bus Converter | Telecom Remote Radio Unit (RRU) Supply |
|---|---|
|
Use Scenario: Converting 48V or 72V telecom battery or rectified AC bus to 3.3V/5V/12V for baseband processing and RF front-end ICs. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 0.5A with high line regulation and fast load transient response. Use Value: Emulated current mode provides inherent line feed-forward and tight load regulation across wide input range without complex compensation. |
Use Scenario: Powering FPGA, ADC/DAC, and RF transceivers in outdoor 5G RRUs where ambient temperature exceeds 85°C. IC Role / Device Role / Timing Role: High-reliability DC-DC converter with thermal shutdown and robust overcurrent protection in sealed enclosures. Use Value: 165°C thermal shutdown with 25°C hysteresis prevents latch-up and enables automatic recovery after cooling. |
| Factory Automation Sensor Node | Railway Signaling Power Module |
|
Use Scenario: Deriving 5V/3.3V from 24V or 72V train or factory bus for microcontrollers, CAN transceivers, and analog sensors. IC Role / Device Role / Timing Role: Compact, high-input-voltage buck regulator supporting wide operating temperature (–40°C to +125°C junction). Use Value: 6–75V input range eliminates need for intermediate pre-regulators, reducing system cost and footprint. |
Use Scenario: Providing isolated auxiliary power for signaling logic in EN 50155-compliant railway electronics with 72V nominal bus. IC Role / Device Role / Timing Role: Input-stage buck controller feeding downstream isolated DC-DC modules; operates under harsh voltage transients. Use Value: Absolute max VIN = 76V and built-in 500ns forced off-time ensure robustness against rail surges and maintain bootstrap charge integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5575Q0MT/NOPB | Higher 1.5A output current, same 75V rating and pinout; larger thermal footprint required | Used where >0.5A load current or higher peak transient demand exists | Select LM5575Q0MT/NOPB when output current exceeds 0.5A or thermal margin is constrained |
| TPS54360BQPWPRQ1 | Automotive-grade (AEC-Q100), 60V max input, 3.5A output, integrated FET, different pinout and compensation scheme | Targeted at automotive infotainment and ADAS subsystems with stricter qualification requirements | Choose TPS54360BQPWPRQ1 only for AEC-Q100-compliant designs requiring >60V input tolerance is not mandatory |
Compared with LM5575Q0MT/NOPB, LM5574Q0MT/NOPB offers lower cost and smaller thermal solution for ≤0.5A loads; versus TPS54360BQPWPRQ1, it provides higher input voltage support (75V vs 60V) but lacks automotive qualification and higher current capability.
Availability
LM5574Q0MT/NOPB is available at Aetrix Electronics and suitable for industrial automation, railway signaling, telecom infrastructure, and factory sensor nodes requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5574Q0MT/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 is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM5574 product line delivers easy-to-use, high-input-voltage buck regulators for industrial and telecom applications where wide VIN range, integrated FETs, and robust protection are essential design requirements.
FAQ
What is the maximum input voltage rating for LM5574Q0MT/NOPB?
The absolute maximum input voltage for LM5574Q0MT/NOPB is 76V, with recommended operating range from 6V to 75V. Exceeding 76V-even transiently-can cause permanent damage. Layout best practices include placing high-quality input capacitors close to VIN and PGND pins to suppress ringing during line transients. The device's internal UVLO and thermal shutdown provide secondary protection, but they do not replace proper front-end filtering.
How does the emulated current-mode control in LM5574Q0MT/NOPB differ from traditional current-mode control?
LM5574Q0MT/NOPB uses an emulated current ramp generated from (VIN–VOUT) and a diode-current sample-and-hold circuit-avoiding direct switch-current sensing. This eliminates leading-edge spikes and measurement delays, enabling stable operation at very low duty cycles (e.g., 12V→3.3V at 75V input). Traditional current-mode ICs require blanking circuits and suffer from noise susceptibility; LM5574Q0MT/NOPB achieves inherent line regulation and simplified loop compensation without those compromises.
Can LM5574Q0MT/NOPB synchronize with external clock sources?
Yes, LM5574Q0MT/NOPB supports external clock synchronization via its SYNC pin. An open-drain external clock signal (minimum pulse width 15ns, frequency > free-running oscillator) can lock the internal oscillator. Multiple LM5574Q0MT/NOPB units can also self-synchronize by connecting their SYNC pins-highest-frequency unit acts as master. This feature reduces EMI peaks and enables deterministic timing in multi-rail power systems without requiring additional timing ICs.
What is the purpose of the PRE pin on LM5574Q0MT/NOPB?
The PRE (pre-charge) pin on LM5574Q0MT/NOPB is an open-drain output tied internally to SW, activated for 250ns before each on-time to assist charging the BST–SW bootstrap capacitor. It is especially valuable in light-load or pre-biased output conditions where SW may not swing sufficiently negative to self-charge the BST capacitor. Connecting PRE directly to SW improves startup reliability and prevents bootstrap undervoltage faults in demanding applications.
Does LM5574Q0MT/NOPB require external compensation components?
Yes, LM5574Q0MT/NOPB requires external compensation components connected between COMP and FB pins-typically a Type II network (resistor + capacitor + series RC). The error amplifier has 70dB DC gain and 3MHz unity-gain bandwidth, and its output drives the COMP pin directly. TI's WEBENCH® Power Designer generates optimized compensation values based on user-defined input/output conditions, inductor value, and desired phase margin-ensuring stable operation across all operating points.
LM5574Q0MT/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 70V
- Current - Output:
- 500mA
- Frequency - Switching:
- 50kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
LM5574Q0MT/NOPB FAQ
1.How can I place an order for LM5574Q0MT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5574Q0MT/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 LM5574Q0MT/NOPB reliable?
The price and inventory of LM5574Q0MT/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5574Q0MT/NOPB is usually 5 days.
3.What payment methods are accepted for LM5574Q0MT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5574Q0MT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5574Q0MT/NOPB?
LM5574Q0MT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5574Q0MT/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 LM5574Q0MT/NOPB?
For technical support, including LM5574Q0MT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5574Q0MT/NOPB requirements.
6.How does Aetrix verify that LM5574Q0MT/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5574Q0MT/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 LM5574Q0MT/NOPB meets industry standards.
7.What is the process for return or replacement of LM5574Q0MT/NOPB?
All LM5574Q0MT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5574Q0MT/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 LM5574Q0MT/NOPB part is unused and in its original packaging.
Return procedure for LM5574Q0MT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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