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Texas Instruments LM25575QMHX/NOPB
- Part No.:
- LM25575QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25575QMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,028
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Product details
Overview
LM25575QMHX/NOPB from Texas Instruments is a 42V, 1.5A synchronous step-down DC/DC switching regulator with integrated 330mΩ N-channel MOSFET, adjustable 1.225V output voltage, 1.5% feedback reference accuracy, and emulated current-mode control architecture. It operates across 6V–42V input, delivers continuous 1.5A output, and supports industrial power conversion in harsh voltage environments.
For engineers reviewing the LM25575QMHX/NOPB datasheet, LM25575QMHX/NOPB pinout, LM25575QMHX/NOPB application, or LM25575QMHX/NOPB equivalent, key selection criteria include input voltage range (6–42V), thermal performance in HTSSOP-16EP package, soft-start programmability, oscillator synchronization capability, and cycle-by-cycle current limiting for robust industrial bus regulation.
Technical Context
The LM25575QMHX/NOPB implements emulated current-mode control using a reconstructed ramp signal derived from VIN–VOUT and diode current sampling via the IS pin, eliminating leading-edge spikes and enabling stable operation at low duty cycles. Its dual-mode VCC regulator tracks VIN up to 9V then regulates to 7V, supporting wide-input operation while limiting internal dissipation.
Frequency is set by a single RT-to-AGND resistor (50kHz–1MHz range) and synchronized via the open-drain SYNC pin, allowing multi-device coordination without external clock generators. Protection includes cycle-by-cycle current limit (1.8–2.5A), thermal shutdown at 165°C, remote shutdown via SD pin with 0.7V/1.225V thresholds, and bootstrap UVLO (4V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 42V - supports direct connection to industrial 24V/36V/42V bus rails without pre-regulation |
| Output Current | 1.5A continuous - sufficient for powering FPGA I/O banks, PLC modules, or sensor signal chains |
| Feedback Reference | 1.225V ±1.5% - enables precise output setting down to 1.225V with minimal external resistor tolerance impact |
| Switch RDS(on) | 330mΩ typical - reduces conduction loss at full load, improving efficiency in high-current 12V→5V or 24V→3.3V conversions |
| Operating Frequency | 50kHz to 1MHz - allows trade-off between inductor size (higher f = smaller L) and switching loss (lower f = lower ESW) |
| Junction Temp Range | –40°C to +125°C - validated for extended operation in enclosed industrial enclosures without forced air |
| Thermal Resistance θJA | 38.4°C/W - requires exposed pad soldered to PCB ground plane to maintain safe junction temperature at full load |
Pinout & Package
LM25575QMHX/NOPB is housed in a thermally enhanced HTSSOP-16EP (PWP) package measuring 5mm × 4.4mm with an exposed die attach pad for direct thermal coupling to the PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 6–42V unregulated rail; connects to input capacitor bank and feeds internal VCC regulator |
| VCC | Bias supply output | Provides ~7V regulated bias for internal circuitry; requires 0.1–1µF ceramic decoupling to PGND |
| SW | Switching node | Drives external Schottky diode and buck inductor; high dv/dt node requiring tight layout and ground shielding |
| BST | Bootstrap supply input | Connects to SW via 0.022µF ceramic capacitor to enable high-side gate drive of internal N-MOSFET |
| FB | Feedback input | Connects to resistor divider from VOUT; sets output voltage via 1.225V internal reference |
| COMP | Error amplifier output | Interface point for type-II compensation network (R/C from COMP to FB) to stabilize loop response |
| RT | Oscillator frequency set | Resistor from RT to AGND programs switching frequency; value determines timing accuracy and EMI profile |
| SYNC | Frequency sync I/O | Open-drain pin enabling master-slave synchronization of multiple LM25575QMHX/NOPB devices |
| SD | Shutdown control | Three-state logic: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active; internal 5µA pull-up if floating |
| SS | Soft-start control | External capacitor sets startup ramp time; discharged during fault conditions (thermal, UVLO, SD low) |
| RAMP | Emulated current ramp | Connects to external capacitor (50–2000pF) that sets slope for current-mode PWM comparator |
| IS | Diode current sense | Measures re-circulating diode anode current to reconstruct DC level of inductor current for accurate current mode |
| PGND | Power ground | Low-side return for switch and current sense; must be separated from AGND and tied at single point near EXPOSED PAD |
| AGND | Analog ground | Reference for FB, COMP, RT, RAMP; kept separate from PGND to avoid noise coupling into error amplifier |
| OUT | Regulated output | Direct connection to output capacitor; routed with low-inductance path to minimize ripple and transient response degradation |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode control | Eliminates need for current-sense resistor and associated filtering; enables stable regulation at <10% duty cycle in high-VIN/low-VOUT applications |
| Integrated 42V/330mΩ N-MOSFET | Reduces BOM count and layout area; eliminates external high-voltage switch and gate driver complexity |
| Adjustable soft-start (SS pin) | Prevents inrush current and output overshoot during power-up; capacitor value directly sets ramp time without additional ICs |
| Controller synchronization (SYNC pin) | Enables deterministic interleaving or frequency locking across multiple regulators to reduce input/output ripple and EMI peaks |
| Wide-bandwidth error amplifier | 3MHz unity-gain bandwidth supports fast transient response to load steps common in industrial I/O and communication circuits |
| Thermal shutdown with hysteresis | 165°C trip with 25°C hysteresis prevents thermal cycling; forces full reset and soft-start recovery upon cooling |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Provides isolated 5V/3.3V rails for digital I/O, analog front-ends, and microcontroller cores inside programmable logic controllers operating on 24V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.5A continuous output with input transient immunity up to 42V and thermal resilience in sealed enclosures. Use Value: Eliminates need for external high-voltage pre-regulator; maintains regulation during 24V bus dips to 9V and surges to 40V per ISO 16750-2. | Use Scenario: Generates stable 5V supply for CAN transceivers, LIN interfaces, and microcontrollers in body electronics modules powered from 12V battery with load-dump transients. IC Role / Device Role / Timing Role: High-reliability buck converter with cycle-by-cycle current limiting and thermal shutdown to survive automotive cranking and jump-start events. Use Value: Withstands 42V load-dump pulses without latch-off; soft-start prevents fuse blowing during cold-cranking voltage recovery. |
| Telecom Remote Radio Unit | Factory Automation Sensor Hub |
Use Scenario: Powers FPGAs and RF front-end ICs in outdoor 48V-powered remote radio units where ambient temperature exceeds 85°C. IC Role / Device Role / Timing Role: Main DC/DC stage converting -48V (rectified) or +48V telecom bus to 12V/5V/3.3V with high efficiency and low thermal resistance. Use Value: Exposed-pad HTSSOP-16EP package achieves 1.5°C/W junction-to-board thermal resistance, enabling full 1.5A output at 85°C ambient. | Use Scenario: Supplies 3.3V to distributed IO-Link masters, pressure sensors, and RS-485 transceivers in modular factory automation nodes connected to 24V fieldbus. IC Role / Device Role / Timing Role: Compact, robust point-of-load regulator with programmable frequency to avoid noise coupling into sensitive analog measurement paths. Use Value: SYNC pin allows synchronization to system clock domain, eliminating beat frequencies between switching noise and ADC sampling clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QHPRQ1 | 42V, 1A, integrated 600mΩ FET; requires external compensation; no IS pin or emulated ramp | Lacks diode current sensing and emulated ramp - less accurate current-mode control at light loads | Choose when cost sensitivity outweighs need for tight transient response and sub-10% duty cycle stability |
| TPS54340QDDARQ1 | 42V, 3.5A, integrated 120mΩ FET; fixed 2.5V VREF; no SYNC or RAMP pins | Higher current rating but lacks frequency synchronization and programmable ramp slope compensation | Choose when higher output current is required and multi-device EMI reduction is not critical |
Compared with LM5164QHPRQ1 and TPS54340QDDARQ1, the LM25575QMHX/NOPB uniquely combines 1.5A capability with emulated current-mode architecture, SYNC pin for EMI control, and IS/RAMP pins for precision current reconstruction - making it optimal for industrial applications demanding both robustness and predictable transient behavior.
Availability
LM25575QMHX/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, telecom remote radio units, and factory automation sensor hubs requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM25575QMHX/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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and communications markets.
The LM25575QMHX/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for reliable DC/DC conversion in harsh industrial and automotive environments where input transients, thermal stress, and long-term reliability are critical.
FAQ
What is the maximum input voltage rating for LM25575QMHX/NOPB?
The absolute maximum input voltage for LM25575QMHX/NOPB is 45V, with recommended operation from 6V to 42V. Exceeding 45V risks permanent damage. During transients such as load dump or inductive kickback, external clamping or TVS protection is advised to keep VIN within specification, especially in automotive or industrial 24V/48V systems where ringing may exceed limits.
Does LM25575QMHX/NOPB require an external Schottky diode?
Yes, LM25575QMHX/NOPB requires an external Schottky diode connected between SW and OUT. The IC integrates only the high-side N-channel MOSFET; the diode provides the low-side recirculation path. TI recommends CMSH3-60 or equivalent 60V/3A Schottky diodes with low forward voltage and fast recovery to minimize conduction loss and improve efficiency at full load.
How is the switching frequency set on LM25575QMHX/NOPB?
The switching frequency of LM25575QMHX/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 ns) / 135 ps - a 32.4kΩ resistor yields ~200kHz. Frequency range spans 50kHz to 1MHz; values outside this range cause unstable operation or excessive jitter. RT must be placed adjacent to the IC with short traces to AGND.
What is the purpose of the IS pin on LM25575QMHX/NOPB?
The IS pin on LM25575QMHX/NOPB senses current through the external Schottky diode's anode to reconstruct the DC level of inductor current. This sampled-and-held value combines with the emulated ramp (from RAMP pin) to form the complete current-mode control signal. Connecting IS correctly is mandatory for accurate current limiting and stable regulation - failure causes overcurrent faults or erratic switching.
Can LM25575QMHX/NOPB operate without connecting the BST capacitor?
No, LM25575QMHX/NOPB cannot operate reliably without the BST capacitor. A 0.022µF ceramic capacitor must be placed between BST and SW pins to charge the internal bootstrap capacitor during the off-time. Omitting it prevents proper high-side gate drive, causing switch failure, excessive heating, or immediate shutdown. Short, low-inductance traces are essential - long traces degrade bootstrap recharge and cause intermittent operation.
LM25575QMHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (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):
- 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
LM25575QMHX/NOPB FAQ
1.How can I place an order for LM25575QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25575QMHX/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 LM25575QMHX/NOPB reliable?
The price and inventory of LM25575QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25575QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25575QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25575QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25575QMHX/NOPB?
LM25575QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25575QMHX/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 LM25575QMHX/NOPB?
For technical support, including LM25575QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25575QMHX/NOPB requirements.
6.How does Aetrix verify that LM25575QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25575QMHX/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 LM25575QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25575QMHX/NOPB?
All LM25575QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25575QMHX/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 LM25575QMHX/NOPB part is unused and in its original packaging.
Return procedure for LM25575QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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