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Texas Instruments LM25575Q0MH/NOPB
- Part No.:
- LM25575Q0MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25575Q0MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM25575Q0MH/NOPB from Texas Instruments is a 42V, 1.5A synchronous step-down DC/DC switching regulator with integrated 330mΩ N-channel MOSFET, emulated current-mode control, and adjustable 50kHz–1MHz switching frequency. It delivers precise 1.225V feedback reference (±1.5%) and supports industrial power conversion from 6V to 42V input, enabling robust 12V or 24V bus regulation in harsh environments.
For engineers reviewing the LM25575Q0MH/NOPB datasheet, LM25575Q0MH/NOPB pinout, LM25575Q0MH/NOPB application, or LM25575Q0MH/NOPB equivalent, this page provides verified package mapping (HTSSOP-16EP), confirmed thermal metrics (RθJA = 38.4°C/W), validated soft-start behavior (10µA current source), and real-world synchronization capability across multiple regulators via SYNC pin.
Technical Context
The LM25575Q0MH/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 stable operation at low duty cycles. Its dual-mode VCC regulator tracks VIN up to 9V then clamps at 7.15V, reducing internal dissipation in high-input applications.
It features cycle-by-cycle current limiting (2.1A typ), thermal shutdown at 165°C with 25°C hysteresis, and programmable soft-start via external capacitor on SS pin. The SYNC pin supports master-slave synchronization of multiple LM25575Q0MH/NOPB units without external logic, with 550kHz max sync frequency and 15ns minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 42V - supports direct connection to industrial 24V/36V/42V power buses without pre-regulation. |
| Output Current | 1.5A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or isolated gate drivers. |
| Feedback Reference | 1.225V ±1.5% - enables accurate output setting down to 1.225V with minimal external resistor tolerance impact. |
| Switching Frequency | 50kHz to 1MHz (resistor-programmable) - allows trade-off between inductor size (higher fSW) and conduction loss (lower fSW). |
| Integrated MOSFET Rds(on) | 330mΩ (typ) - reduces external component count and improves efficiency at 1A load vs discrete solutions. |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial temperature operation without derating. |
| Thermal Resistance | RθJA = 38.4°C/W - requires ≥250mm² exposed copper pad under EP for full 1.5A rating at 85°C ambient. |
Pinout & Package
LM25575Q0MH/NOPB uses the HTSSOP-16EP (PWP) package: 5.0mm × 4.4mm body with 0.65mm pitch and exposed thermal pad (EP) soldered to PCB ground plane for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 6–42V; powers internal bias regulator and buck switch; absolute max 45V. |
| VCC | Bias supply output | Regulated 7.15V output (or tracks VIN ≤9V); requires 0.1–1µF ceramic decoupling. |
| SW | Switch node | Drives external Schottky diode and buck inductor; connects to BST capacitor during off-time. |
| BST | Bootstrap supply input | Connects to SW via 0.022µF ceramic capacitor; enables high-side N-MOSFET gate drive. |
| FB | Feedback input | Connects to resistor divider from VOUT; 1.225V threshold sets regulated output voltage. |
| COMP | Error amplifier output | Interface for type-II compensation network (R/C between COMP and FB) to stabilize loop. |
| RT | Oscillator frequency set | Resistor to AGND sets fSW from 50kHz–1MHz; placement critical for noise immunity. |
| SYNC | Frequency synchronization | Open-drain input/output; enables multi-regulator phase alignment or external clock lock. |
| SD | Shutdown control | Three-state: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active; internal 5µA pull-up. |
| SS | Soft-start timing | 10µA current source charges external capacitor; controls output voltage ramp rate at startup. |
| RAMP | Emulated current ramp | External capacitor sets slope; internal current source scales with (VIN–VOUT) for accurate current sense. |
| IS | Diode current sense | Measures re-circulating Schottky diode current to reconstruct DC inductor current level. |
| AGND / PGND | Analog & power ground | Separate pins minimize noise coupling; AGND references control circuitry, PGND handles high di/dt return. |
| PRE | Pre-charge assist | Open-drain output tied to SW; aids BST capacitor charging during light-load or pre-biased start-up. |
| EP | Exposed thermal pad | Must be soldered to solid PCB ground plane; primary thermal path for junction-to-board conduction (RθJB = 15.6°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode architecture | Eliminates current-sense spike filtering delays, enabling stable regulation at <10% duty cycle in high-VIN/low-VOUT applications. |
| Programmable soft-start | 10µA precision current source on SS pin allows predictable output voltage ramp time and inrush current limiting. |
| Multi-device synchronization | SYNC pin supports daisy-chained or master-clock synchronized operation of multiple LM25575Q0MH/NOPB regulators. |
| Dual-mode VCC regulator | Tracks VIN up to 9V then regulates at 7.15V, reducing internal power loss and enabling direct 42V input operation. |
| Robust protection suite | Includes cycle-by-cycle current limit (2.1A), thermal shutdown (165°C), UVLO on VCC (5.35V), and remote shutdown via SD pin. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Converting 48V telecom rack voltage to 3.3V/5V for baseband processor and interface ICs. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.5A at 92% efficiency; operates at 500kHz to minimize EMI near sensitive RF sections. Use Value: Integrated MOSFET and emulated current mode eliminate external sense resistor and reduce layout sensitivity to noise. |
Use Scenario: Generating 12V intermediate rail from 24V industrial PLC backplane for I/O modules and sensors. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with thermal shutdown and wide input range to tolerate brownouts and surges. Use Value: 125°C junction rating and HTSSOP-16EP package ensure stable operation in sealed enclosures without forced air cooling. |
| Automotive Body Control | Test & Measurement Equipment |
|
Use Scenario: Powering MCU and CAN transceivers from 12V battery with cold-crank tolerance down to 6V. IC Role / Device Role / Timing Role: Input-robust buck controller maintaining regulation during engine cranking transients. Use Value: 6V min input and 42V max rating cover automotive load-dump and cold-crank conditions without external protection. |
Use Scenario: Providing clean, adjustable 1.225–24V output for benchtop power supplies and automated test fixtures. IC Role / Device Role / Timing Role: Programmable-frequency regulator supporting variable output voltage via FB divider and RT resistor. Use Value: Adjustable soft-start and SYNC capability enable precise sequencing and parallel operation for higher-current outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25574Q0MH/NOPB | Same pinout and feature set but rated for 40V max input (vs 42V) and 1.25A output (vs 1.5A); identical thermal metrics and SYNC capability. | Suitable for lower-power 24V systems where 1.25A suffices and 40V input margin is acceptable. | Select LM25574Q0MH/NOPB only if system input never exceeds 40V and peak load stays below 1.25A. |
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 100V input, 0.6A output, integrated high-side MOSFET, but no SYNC pin or emulated current mode. | Required for automotive safety-critical applications needing AEC-Q100 qualification and higher input voltage tolerance. | Choose LM5164QDDARQ1 when AEC-Q100 compliance or >42V input is mandatory, accepting reduced output current and no multi-device sync. |
Compared with LM25575Q0MH/NOPB, LM25574Q0MH/NOPB offers identical integration and layout compatibility at lower current/voltage ratings, while LM5164QDDARQ1 trades sync and current capability for automotive qualification and wider input range - neither is pin-compatible nor drop-in.
Availability
LM25575Q0MH/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control units, and test equipment requiring stable component supply with full production traceability.
Supply support for LM25575Q0MH/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 LM25575Q0MH/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for industrial and automotive applications demanding wide input range, integrated FETs, and robust fault protection without external complexity.
FAQ
What is the maximum input voltage rating for LM25575Q0MH/NOPB?
The LM25575Q0MH/NOPB has an absolute maximum input voltage rating of 45V, with recommended operating range from 6V to 42V. Exceeding 45V risks permanent damage. In practice, designs should maintain ≥3V margin below 45V to accommodate transient ringing - especially critical in 42V automotive or industrial bus applications where line spikes may occur.
Does LM25575Q0MH/NOPB require an external Schottky diode?
Yes, the LM25575Q0MH/NOPB requires an external Schottky diode connected between SW and OUT pins. It integrates only the high-side N-channel MOSFET switch, not the low-side rectifier. The diode conducts during the switch off-time and must handle peak currents up to 2.1A with low forward voltage (e.g., CMSH3-60) to maintain efficiency and thermal performance.
How is the switching frequency set on LM25575Q0MH/NOPB?
The switching frequency of LM25575Q0MH/NOPB is set by a single resistor (RT) connected between the RT pin and AGND. Using Equation 1 from the datasheet (RT = (1/F − 580×10⁻⁹)/135×10⁻¹²), a 32.4kΩ resistor yields ~200kHz. Resistor placement must be adjacent to the IC with short traces to minimize noise coupling into the oscillator timing node.
Can LM25575Q0MH/NOPB operate without connecting the BST capacitor?
No - the BST capacitor (0.022µF ceramic) between BST and SW pins is mandatory. It supplies gate drive voltage for the internal high-side MOSFET during on-time. Omitting it causes immediate failure of the switch, resulting in no output regulation and potential damage due to shoot-through or insufficient gate drive.
What thermal design guidance applies to LM25575Q0MH/NOPB in HTSSOP-16EP package?
For LM25575Q0MH/NOPB, the exposed pad (EP) must be soldered to a ≥250mm² internal or external PCB ground plane to achieve the specified RθJB = 15.6°C/W. Without proper thermal pad connection, junction temperature rise exceeds limits at 1A load. Thermal vias (≥6×0.3mm) under EP are strongly recommended to enhance heat transfer to inner layers.
LM25575Q0MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (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):
- 6V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 1.5A
- 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-HTSSOP
LM25575Q0MH/NOPB FAQ
1.How can I place an order for LM25575Q0MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25575Q0MH/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 LM25575Q0MH/NOPB reliable?
The price and inventory of LM25575Q0MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25575Q0MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM25575Q0MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25575Q0MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25575Q0MH/NOPB?
LM25575Q0MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25575Q0MH/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 LM25575Q0MH/NOPB?
For technical support, including LM25575Q0MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25575Q0MH/NOPB requirements.
6.How does Aetrix verify that LM25575Q0MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25575Q0MH/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 LM25575Q0MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM25575Q0MH/NOPB?
All LM25575Q0MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25575Q0MH/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 LM25575Q0MH/NOPB part is unused and in its original packaging.
Return procedure for LM25575Q0MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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