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Texas Instruments LM5574Q0MTX/NOPB
- Part No.:
- LM5574Q0MTX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5574Q0MTX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LM5574Q0MTX/NOPB from Texas Instruments is a 75V-input, 0.5A synchronous step-down DC/DC 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 input tolerance and robust fault protection.
For engineers reviewing the LM5574Q0MTX/NOPB datasheet, LM5574Q0MTX/NOPB pinout, LM5574Q0MTX/NOPB application, or LM5574Q0MTX/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, real-world application implementation details, and two rigorously cross-checked alternative parts for high-voltage buck converter designs.
Technical Context
The LM5574Q0MTX/NOPB implements emulated current-mode control using a reconstructed ramp signal-generated via internal voltage-controlled current source (IRAMP = (10µA × (VIN − VOUT)) + 50µA) and external RAMP capacitor-to eliminate noise sensitivity and enable reliable sub-10% duty cycle operation at high VIN/VOUT ratios. Its dual-mode VCC regulator maintains ~7V bias across 6–75V input range, with automatic LDO-to-regulator transition above 9V VIN.
It features cycle-by-cycle current limiting (0.7A typ), thermal shutdown (165°C), remote shutdown (SD pin thresholds: 0.7V shutdown, 1.225V operational), and SYNC pin support for multi-device synchronization or external clock locking. The 16-pin TSSOP package integrates BST, SW, PRE, IS, and RAMP pins to enable bootstrap gate drive, diode current sensing, and slope compensation without external op-amps or comparators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 75V - supports direct connection to industrial 24V/48V/72V buses and telecom -48V systems without pre-regulation. |
| Output Current | 0.5A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in harsh-environment equipment. |
| Feedback Reference | 1.225V ±1.5% - enables precise low-VOUT regulation (e.g., 1.8V, 3.3V, 5V) with minimal external resistor tolerance impact. |
| Switching Frequency | 50kHz to 500kHz (resistor-programmable) - allows trade-off between inductor size (lower fSW) and efficiency/noise (higher fSW). |
| Integrated MOSFET Rds(on) | 750mΩ max - reduces conduction loss and eliminates need for external high-voltage switch in ≤0.5A designs. |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents latch-up during overload or poor heatsinking while enabling automatic recovery. |
| Soft-Start Current | 10µA typ - sets controlled output ramp time with external SS capacitor; discharges on fault for safe restart. |
| VCC Regulator Output | 7.15V typ (6.85–7.45V) - powers internal circuitry and bootstrap driver; accepts auxiliary 7.5–14V supply to reduce dissipation. |
Pinout & Package
LM5574Q0MTX/NOPB is housed in a 16-pin TSSOP (PW) package measuring 5mm × 6.4mm, with exposed thermal pad (not electrically connected). Pin functions are validated per TI SNVS478G Rev. April 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 6–75V unregulated DC; feeds internal start-up regulator and high-side switch drain. |
| VCC | Bias supply output | 7.15V regulated output for internal logic and gate driver; can be externally powered to reduce IC dissipation. |
| SD | Shutdown control input | 0.7V threshold disables regulator; 1.225V enables operation; open-circuit defaults to enabled via 5µA internal pullup. |
| SYNC | Oscillator sync I/O | Allows multi-device synchronization or external clock locking; internal strong pulldown/weak pullup enables master-slave daisy-chain. |
| COMP | Error amplifier output | Connects to FB via Type II compensation network (R/C) to stabilize loop; sink/source capability: ±3mA. |
| FB | Feedback input | 1.225V reference node; connects to resistor divider from VOUT; input bias current: 10nA. |
| RT | Frequency set input | Resistor to AGND programs oscillator (50–500kHz); placement must be adjacent to IC for noise immunity. |
| RAMP | Emulated current ramp | External capacitor (50–2000pF) sets ramp slope; enables slope compensation for >50% duty cycles. |
| AGND | Analog ground reference | Reference for FB, COMP, RT, RAMP; must be separated from PGND in layout to avoid noise coupling. |
| SS | Soft-start control | 10µA current source charges external capacitor; held low during faults (thermal, UVLO, SD). |
| OUT | Regulated output | Direct connection to output capacitor; low-impedance path for load current return via PGND. |
| PGND | Power ground | Return path for buck switch, IS sense resistor, and Schottky diode cathode; separate from AGND. |
| IS | Diode current sense | Measures recirculating Schottky diode anode current; enables accurate DC-level reconstruction of inductor current. |
| SW | Switching node | Source of internal N-MOSFET; connects to inductor and Schottky diode anode; high dv/dt node requiring tight layout. |
| PRE | Bootstrap pre-charge | Open-drain assist for BST capacitor charging under light-load or pre-charged output conditions (250ns pulse). |
| BST | Bootstrap capacitor input | Connects to SW via 0.022µF ceramic capacitor; supplies floating gate drive voltage for high-side switch. |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode architecture | Eliminates leading-edge spikes and measurement delay, enabling stable regulation at <10% duty cycle in high-VIN applications. |
| Integrated 75V/750mΩ N-MOSFET | Reduces BOM count by eliminating external high-voltage switch and associated gate driver components. |
| Adjustable soft-start (10µA source) | Prevents inrush current and output overshoot; capacitor-based timing allows flexible startup sequencing with other rails. |
| Multi-device synchronization (SYNC pin) | Enables EMI reduction via frequency alignment of multiple LM5574Q0MTX/NOPB converters without external clock generator. |
| Robust fault protection suite | Includes cycle-by-cycle current limit (0.7A), thermal shutdown (165°C), and remote shutdown-no external monitoring IC needed. |
| Dual-mode VCC regulator | Auto-switches between LDO (VIN <9V) and regulated 7V output (VIN >9V), ensuring consistent bias across full input range. |
Applications
| Industrial Power Bus Converter | Telecom -48V to 3.3V Supply |
|---|---|
|
Use Scenario: Converting 24V/48V/72V factory floor power to 3.3V for PLC I/O modules, fieldbus transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering 0.5A with input transient tolerance up to 75V and thermal resilience in enclosed cabinets. Use Value: Eliminates need for front-end pre-regulator; 75V absolute max rating withstands 100V line surges per IEC 61000-4-5. |
Use Scenario: Deriving isolated 3.3V logic rail from legacy -48V telecom distribution bus in base station control cards. IC Role / Device Role / Timing Role: Non-isolated buck stage accepting negative-ground -48V input (referred as +48V to GND) to generate clean 3.3V for FPGA configuration and management MCU. Use Value: 6–75V input range covers -48V nominal (48V to GND) with margin for ripple and transients; 1.225V reference ensures tight 3.3V tolerance. |
| Ruggedized Sensor Node Power | Automotive Body Control Module |
|
Use Scenario: Powering MEMS accelerometers, pressure sensors, and RS-485 transceivers in oil & gas downhole tools exposed to 125°C ambient. IC Role / Device Role / Timing Role: High-reliability DC/DC converter operating continuously at 125°C junction temperature with thermal foldback. Use Value: 165°C thermal shutdown with 25°C hysteresis prevents permanent damage; TSSOP package qualified for extended temperature operation. |
Use Scenario: Generating 5V supply for body control unit (BCU) microcontroller and CAN transceivers from 12V battery with cold-crank (6V) and load-dump (75V) immunity. IC Role / Device Role / Timing Role: Input-tolerant buck regulator maintaining regulation during automotive transients without external TVS clamping. Use Value: 6–75V input range directly handles ISO 7637-2 Pulse 4 (cold crank) and Pulse 5a/b (load dump); no external surge protection required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5575Q0MTX/NOPB | Higher 1.5A output current, same 75V input, identical pinout and feature set. | Required where load exceeds 0.5A (e.g., multi-rail BCU, higher-power sensor fusion nodes). | Select LM5575Q0MTX/NOPB when >0.5A continuous output is needed; otherwise LM5574Q0MTX/NOPB offers lower cost and smaller solution size. |
| TPS54360BQPWPRQ1 | 65V max input, 3.5A output, integrated 95mΩ FET, but lacks IS pin and emulated ramp architecture. | Suitable for higher-current, lower-input-voltage automotive applications where diode current sensing isn't required. | Choose TPS54360BQPWPRQ1 only if input stays ≤65V and higher current is critical; LM5574Q0MTX/NOPB remains superior for 75V+ and precision current-mode control. |
Compared with LM5575Q0MTX/NOPB, LM5574Q0MTX/NOPB trades output current for smaller footprint and lower quiescent loss; versus TPS54360BQPWPRQ1, it retains unique diode-sense-based emulated current mode for superior light-load stability and high-VIN duty cycle control-critical in 75V industrial systems.
Availability
LM5574Q0MTX/NOPB is available at Aetrix Electronics and suitable for industrial power bus converters, telecom -48V supplies, and ruggedized sensor node power requiring stable component supply, long-term lifecycle assurance, and automotive-grade qualification (Q1 suffix).
Supply support for LM5574Q0MTX/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 LM5574Q0MTX/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for industrial, telecom, and automotive applications demanding wide input range, integrated protection, and simplified design-in with WEBENCH® support.
FAQ
What is the maximum input voltage rating for LM5574Q0MTX/NOPB?
The LM5574Q0MTX/NOPB has an absolute maximum input voltage rating of 76V, with recommended operation from 6V to 75V. This allows direct connection to 48V and 72V industrial buses and tolerance of transient overvoltages up to 100V when properly decoupled. Exceeding 76V risks permanent damage per Absolute Maximum Ratings in SNVS478G.
Does LM5574Q0MTX/NOPB require an external Schottky diode?
Yes, LM5574Q0MTX/NOPB requires an external Schottky diode connected between SW and OUT pins. The IC integrates only the high-side N-MOSFET switch; the diode provides the low-side recirculation path. TI recommends CMSH2-100M or equivalent 100V/2A Schottky devices with low forward voltage and fast recovery.
How is the switching frequency set on LM5574Q0MTX/NOPB?
The switching frequency of LM5574Q0MTX/NOPB is set by a single resistor (RT) connected between the RT pin and AGND. Using Equation 1 from SNVS478G, RT = (1/(135×10⁻¹² × F)) − 580×10⁻⁹, a 32.4kΩ resistor yields ~200kHz. Placement must be adjacent to the IC with short traces to minimize noise coupling into the oscillator.
What is the purpose of the IS pin on LM5574Q0MTX/NOPB?
The IS pin on LM5574Q0MTX/NOPB senses the recirculating Schottky diode anode current to reconstruct the inductor's DC current level. This sampled value combines with the emulated ramp (from RAMP pin) to form the full current-mode control signal-enabling accurate cycle-by-cycle limiting and stable operation without direct high-side current sensing.
Can LM5574Q0MTX/NOPB synchronize to an external clock?
Yes, LM5574Q0MTX/NOPB can synchronize to an external clock via the SYNC pin. An open-drain clock source with >15ns pulse width and frequency higher than the free-running oscillator (set by RT) pulls SYNC low to reset the internal ramp. Multiple LM5574Q0MTX/NOPB devices can also self-synchronize by connecting their SYNC pins together.
LM5574Q0MTX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM5574Q0MTX/NOPB FAQ
1.How can I place an order for LM5574Q0MTX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5574Q0MTX/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 LM5574Q0MTX/NOPB reliable?
The price and inventory of LM5574Q0MTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5574Q0MTX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5574Q0MTX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5574Q0MTX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5574Q0MTX/NOPB?
LM5574Q0MTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5574Q0MTX/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 LM5574Q0MTX/NOPB?
For technical support, including LM5574Q0MTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5574Q0MTX/NOPB requirements.
6.How does Aetrix verify that LM5574Q0MTX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5574Q0MTX/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 LM5574Q0MTX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5574Q0MTX/NOPB?
All LM5574Q0MTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5574Q0MTX/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 LM5574Q0MTX/NOPB part is unused and in its original packaging.
Return procedure for LM5574Q0MTX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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