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Texas Instruments LM25574Q0MTX/NOPB
- Part No.:
- LM25574Q0MTX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25574Q0MTX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM25574Q0MTX/NOPB from Texas Instruments is a 42-V, 0.5-A synchronous step-down switching regulator with integrated 750-mΩ N-channel MOSFET, adjustable output down to 1.225 V, ±1.5% feedback reference accuracy, and emulated current-mode control architecture. It operates across 6–42 V input, delivers robust industrial power conversion in TSSOP-16, and supports frequency synchronization for EMI reduction.
For engineers reviewing the LM25574Q0MTX/NOPB datasheet, LM25574Q0MTX/NOPB pinout, LM25574Q0MTX/NOPB application, or LM25574Q0MTX/NOPB equivalent, key selection criteria include input voltage range (6–42 V), output current capability (0.5 A), soft-start adjustability, cycle-by-cycle current limiting, thermal shutdown, and master/slave sync capability for multi-rail systems.
Technical Context
The LM25574Q0MTX/NOPB implements emulated current-mode control using a reconstructed ramp signal-generated via internal voltage-controlled current source (IRAMP = (10 µA × (VIN − VOUT)) + 50 µA) and external RAMP capacitor-eliminating leading-edge spikes and enabling stable operation at low duty cycles. Its dual-mode VCC regulator maintains ~7 V bias above 9 V VIN while tracking VIN below that threshold.
It features programmable oscillator frequency (50 kHz–1 MHz via RT resistor), SYNC pin supporting both master/slave synchronization and external clock locking, and integrated protection including cycle-by-cycle current limit (0.7 A typ), thermal shutdown (165 °C), and remote shutdown with hysteresis (0.1 V). The IS pin enables diode-current-based DC level sampling for accurate current reconstruction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports wide industrial bus voltages including 12 V, 24 V, and 36 V nominal rails without pre-regulation. |
| Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Feedback Reference | 1.225 V ±1.5% - enables precise output regulation down to 1.225 V and simplifies resistor-divider design for common 3.3 V/5 V outputs. |
| Switch RDS(on) | 750 mΩ max - reduces conduction loss and thermal stress in high-input-voltage buck stages. |
| Operating Frequency | 50 kHz to 1 MHz - allows trade-off between inductor size (higher f = smaller L) and efficiency (lower f = lower switching loss). |
| Soft-Start Current | 10 µA typ - sets rise time of internal error amplifier reference via external SS capacitor; ensures controlled output ramp-up. |
| Thermal Shutdown | 165 °C with 25 °C hysteresis - prevents permanent damage during overload or poor heatsinking; automatic recovery after cooldown. |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm), thermally enhanced with exposed PGND pad; suitable for automated assembly and moderate-power density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply connection | Accepts 6–42 V unregulated input; absolute max 45 V; requires local ceramic bypassing near pin. |
| VCC | Bias regulator output | Supplies internal circuitry; regulated to ~7 V above 9 V VIN; accepts auxiliary 7.5–14 V supply to reduce dissipation. |
| SW | Switching node | Drives external Schottky diode and buck inductor; connects internally to N-MOSFET source; high dv/dt node requiring tight layout. |
| BST | Bootstrap capacitor input | Charges external 0.022 µF BST–SW capacitor via internal diode during SW off-time to drive high-side gate. |
| PRE | Pre-charge assist output | Open-drain pulse (250 ns/cycle) connected to SW to boost BST capacitor charge under light load or pre-biased output conditions. |
| PGND | Power ground return | Low-side reference for IS sense resistor and PRE/SW paths; must be routed separately from AGND to avoid noise coupling. |
| AGND | Analog ground reference | Reference for FB, COMP, RAMP, RT, SS; requires star-point connection to PGND at single point near IC. |
| FB | Feedback input | Connects to resistor divider from OUT; internal 1.225 V reference sets output voltage; bias current ≤17 nA minimizes divider error. |
| COMP | Error amplifier output | Interface for type-II compensation network (R/C between COMP and FB); sets loop stability and transient response. |
| RAMP | Emulated current ramp node | External capacitor (50–2000 pF) sets slope; current source scales with (VIN − VOUT); enables sub-50% duty cycle operation. |
| RT | Oscillator frequency set | Resistor to AGND programs frequency (50 kHz–1 MHz); value calculated per TI Equation 1; placement critical for noise immunity. |
| SYNC | Frequency synchronization I/O | Open-drain output / input; enables multi-device sync or external clock lock; sink impedance 110 Ω, threshold 1.3 V (falling). |
| SD | Shutdown control | Three-state logic: <0.7 V = shutdown (70 µA IQ), 0.7–1.225 V = standby, >1.225 V = active; internal 5 µA pull-up if floating. |
| SS | Soft-start timing | 10 µA current source charges external capacitor; holds COMP reference low until SS voltage reaches threshold; prevents inrush. |
| IS | Diode current sense | Connects to Schottky anode; internal 250 mΩ sense resistor + sample/hold captures re-circulating current for DC ramp level. |
| OUT | Regulated output | High-current path to load; connects directly to output capacitor; low-ESR ceramics recommended for stability and ripple suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode control | Eliminates current-sense spike filtering delays and enables stable regulation at <20% duty cycle in high-VIN/low-VOUT applications. |
| Integrated 42-V, 750-mΩ N-MOSFET | Reduces BOM count and layout complexity; eliminates need for external high-voltage switch and associated gate driver. |
| Adjustable soft-start (SS pin) | Prevents input inrush current and output overshoot by controlling error amplifier reference ramp rate via external capacitor. |
| Master/slave synchronization (SYNC pin) | Enables phase-aligned switching across multiple LM25574Q0MTX/NOPB regulators to reduce input ripple and system-level EMI. |
| Dual-mode VCC regulator | Tracks VIN below 9 V (reducing dropout), regulates to 7 V above 9 V (limiting internal dissipation); supports auxiliary bias up to 14 V. |
| Robust fault protection | Includes cycle-by-cycle current limit (0.7 A), thermal shutdown (165 °C), UVLO on VCC (5.35 V), and remote shutdown with hysteresis. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Powers 3.3 V MCU, CAN transceiver, and analog sensors from 24 V vehicle battery or 24 V industrial bus with load dump tolerance. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 3.3 V rail; handles input transients up to 42 V and maintains regulation during cold-crank (6 V). Use Value: Integrated 42-V switch and 0.5-A capability eliminate external HV FET and reduce solution size; SYNC enables synchronized switching with other rails to meet CISPR-25 Class 5 EMI limits. |
Use Scenario: Generates 5 V for infotainment display backlight drivers and USB peripherals from 12 V automotive battery with reverse-polarity protection. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating across 6–16 V battery range; soft-start prevents fuse blowing during ignition-on surge. Use Value: Adjustable frequency (100–500 kHz) allows optimization for lowest EMI in crowded cabin environment; thermal shutdown protects against enclosed enclosure overheating. |
| Telecom Remote Radio Unit | Factory Automation Sensor Node |
|
Use Scenario: Supplies 1.8 V FPGA core voltage and 3.3 V I/O from -48 V telecom rectified bus via intermediate 12 V stage. IC Role / Device Role / Timing Role: Secondary buck regulator stepping 12 V down to low-voltage rails; operates with high line regulation due to emulated current-mode architecture. Use Value: 1.225 V reference and ±1.5% accuracy enable tight FPGA core voltage tolerance; RAMP capacitor tuning ensures stability across temperature and load. |
Use Scenario: Powers wireless IoT sensor (BLE/Wi-Fi SoC + analog front-end) from 24 V factory bus with minimal external components. IC Role / Device Role / Timing Role: Compact, self-contained DC/DC converter delivering 0.5 A at 3.3 V; uses TSSOP-16 footprint compatible with automated SMT lines. Use Value: WEBENCH®-supported design flow accelerates qualification; built-in protection reduces field failure risk in unattended equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25011Q0MKX/NOPB | Higher 60-V input rating, 1.5-A output, but larger SO-PowerPAD-8 package; no SYNC or RAMP pins; fixed 1.225 V reference only. | Targets higher-power industrial supplies where 42 V input margin is insufficient; lacks frequency synchronization for multi-rail EMI control. | Select when input exceeds 42 V or >0.5 A output is required; avoid if soft-start adjustability, sync capability, or compact TSSOP layout is critical. |
| TPS54340QDGQRQ1 | 42-V input, 3.5-A output, integrated high-side FET, but uses current-sense resistor (not IS pin); no RAMP or PRE pins; 100% duty cycle capable. | Suited for higher-current automotive loads (e.g., ADAS cameras); requires external current-sense resistor and lacks diode-current sampling. | Choose for >0.5 A loads or where 100% duty cycle is needed; LM25574Q0MTX/NOPB remains preferred for precision low-current, low-EMI, or space-constrained designs. |
Compared with LM25011Q0MKX/NOPB and TPS54340QDGQRQ1, the LM25574Q0MTX/NOPB offers superior integration for 0.5-A applications-including RAMP-based emulated current sensing, PRE-assisted bootstrap, and dedicated SYNC-enabling smaller footprint, lower EMI, and simpler compensation than higher-current alternatives.
Availability
LM25574Q0MTX/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and telecom infrastructure requiring stable component supply, long-term manufacturability, and AEC-Q100-compliant design assurance.
Supply support for LM25574Q0MTX/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM25574Q0MTX/NOPB belongs to TI's high-voltage buck regulator product line, engineered specifically for robust, low-component-count DC/DC conversion in harsh industrial and automotive environments where input transients and thermal stress are common.
FAQ
What is the maximum input voltage rating for the LM25574Q0MTX/NOPB?
The LM25574Q0MTX/NOPB has an absolute maximum input voltage (VIN to GND) of 45 V, with recommended operating range from 6 V to 42 V. Exceeding 45 V risks permanent damage. Input transients-such as load dump in automotive systems-must be clamped externally to stay within this limit, and proper PCB layout with localized ceramic bypassing is essential to suppress ringing.
Does the LM25574Q0MTX/NOPB require an external current-sense resistor?
No, the LM25574Q0MTX/NOPB does not require an external current-sense resistor. It uses an internal 250-mΩ sense element between IS and PGND to sample the re-circulating diode current, combined with an emulated ramp generated via the RAMP pin and external capacitor. This architecture eliminates external sensing components while maintaining accurate current-mode control.
How is the switching frequency set on the LM25574Q0MTX/NOPB?
The switching frequency of the LM25574Q0MTX/NOPB is set by a single resistor (RT) connected between the RT pin and AGND. Frequency ranges from 50 kHz to 1 MHz depending on RT value, calculated using TI's Equation 1: RT = (1/F) − 580 ns. The resistor must be placed close to the IC with short traces to minimize noise coupling into the oscillator circuit.
Can the LM25574Q0MTX/NOPB synchronize to an external clock?
Yes, the LM25574Q0MTX/NOPB can synchronize to an external clock via the SYNC pin, which functions as an open-drain input. An external clock with frequency higher than the free-running oscillator frequency and pulse width ≥15 ns can be applied. The internal SYNC driver also allows multiple LM25574Q0MTX/NOPB devices to self-synchronize, with the highest-frequency unit acting as master.
What is the purpose of the PRE pin on the LM25574Q0MTX/NOPB?
The PRE (pre-charge) pin on the LM25574Q0MTX/NOPB is an open-drain output that pulses low for 250 ns each switching cycle just before the high-side switch turns on. It assists charging of the BST–SW bootstrap capacitor under light-load conditions or when the output is pre-biased, ensuring reliable gate drive for the internal N-MOSFET and preventing boot-strap under-voltage shutdown.
LM25574Q0MTX/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:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 500mA
- Frequency - Switching:
- 50kHz ~ 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
LM25574Q0MTX/NOPB FAQ
1.How can I place an order for LM25574Q0MTX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25574Q0MTX/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 LM25574Q0MTX/NOPB reliable?
The price and inventory of LM25574Q0MTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25574Q0MTX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25574Q0MTX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25574Q0MTX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25574Q0MTX/NOPB?
LM25574Q0MTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25574Q0MTX/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 LM25574Q0MTX/NOPB?
For technical support, including LM25574Q0MTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25574Q0MTX/NOPB requirements.
6.How does Aetrix verify that LM25574Q0MTX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25574Q0MTX/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 LM25574Q0MTX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25574Q0MTX/NOPB?
All LM25574Q0MTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25574Q0MTX/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 LM25574Q0MTX/NOPB part is unused and in its original packaging.
Return procedure for LM25574Q0MTX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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