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Texas Instruments LM25575MHX/NOPB
- Part No.:
- LM25575MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25575MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM25575MHX/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 from 6V to 42V input and delivers robust power conversion in industrial bus supplies and telecom front-ends.
For engineers reviewing the LM25575MHX/NOPB datasheet, LM25575MHX/NOPB pinout, LM25575MHX/NOPB application, or LM25575MHX/NOPB equivalent, key selection criteria include its HTSSOP-16EP package thermal performance (RθJC(bot) = 1.5°C/W), programmable 50kHz–1MHz switching frequency via RT resistor, cycle-by-cycle current limit (2.1A typ), and soft-start capacitor-controlled startup sequencing.
Technical Context
The LM25575MHX/NOPB implements emulated current-mode control using a sample-and-hold diode current measurement (via IS pin) and an externally set ramp slope (RAMP pin + capacitor), 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 synchronization (SYNC pin) allows multiple LM25575MHX/NOPB units to phase-lock or align with an external clock ≥550kHz, reducing EMI in multi-rail systems. Protection includes thermal shutdown (165°C), cycle-by-cycle current limiting, short-circuit protection, and remote shutdown via SD pin with 0.7V/1.225V thresholds and 5µA internal pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 42V - supports direct connection to 24V/36V/48V industrial and telecom bus rails without pre-regulation. |
| Output Current | 1.5A continuous - sufficient for powering FPGAs, DSPs, and analog signal chains in embedded controllers. |
| Feedback Reference | 1.225V ±1.5% - enables precise output regulation down to 1.225V with minimal external resistor tolerance impact. |
| Switch RDS(on) | 330mΩ (typ) - reduces conduction loss and thermal stress in high-current buck stages. |
| Switching Frequency | 50kHz to 1MHz (RT-programmable) - allows trade-off between inductor size (higher f) and efficiency (lower f). |
| Junction Temp Range | –40°C to 125°C - qualified for extended industrial temperature operation in harsh environments. |
| Thermal Resistance | RθJC(bot) = 1.5°C/W - exposed pad enables efficient heat transfer to PCB ground plane for sustained 1.5A loads. |
Pinout & Package
LM25575MHX/NOPB uses the HTSSOP-16EP (PWP) package: 5mm × 4.4mm body with 0.65mm pitch and exposed thermal pad on underside, requiring solder connection to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Accepts 6–42V unregulated input; powers internal bias regulator and high-side switch. |
| VCC | Bias regulator output | Provides 7V regulated supply for control circuitry; can be externally powered to reduce IC dissipation. |
| SW | Switch node | Connects to inductor and Schottky diode anode; carries high dv/dt switching waveform. |
| BST | Bootstrap capacitor input | Requires 0.022µF ceramic cap to SW for high-side gate drive; enables N-MOSFET use in buck topology. |
| FB | Feedback input | Senses output voltage divider; internal 1.225V reference sets regulation point. |
| COMP | Error amplifier output | Connects to type-II compensation network (R/C) between COMP and FB for loop stability. |
| RT | Oscillator frequency set | Single resistor to AGND programs switching frequency from 50kHz to 1MHz. |
| SYNC | Frequency sync I/O | Allows master-slave synchronization of multiple LM25575MHX/NOPB devices to reduce EMI. |
| SD | Shutdown control | 0.7V threshold disables regulator; 1.225V enables operation; 5µA internal pull-up enables default-on behavior. |
| SS | Soft-start control | 10µA current source charges external capacitor to ramp reference voltage and limit inrush current. |
| RAMP | Emulated current ramp | External capacitor sets slope; internal current source (10µA/VIN–VOUT + 50µA) reconstructs inductor current. |
| IS | Diode current sense | Measures re-circulating diode current to generate DC level of emulated current signal. |
| AGND | Analog ground | Reference for FB, COMP, RT, RAMP, SS; must be separated from PGND for noise immunity. |
| PGND | Power ground | Return path for SW, IS, and bootstrap diode; connects to power plane under exposed pad. |
| OUT | Output connection | Direct connection to regulated output rail; low-impedance path minimizes voltage drop. |
| EP | Exposed thermal pad | Must be soldered to PCB ground plane; primary thermal path for junction-to-board conduction (RθJB = 15.6°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode control | Eliminates leading-edge noise and propagation delay, enabling stable regulation at <10% duty cycle in high-VIN/low-VOUT applications. |
| Integrated 42V/330mΩ N-MOSFET | Reduces BOM count and layout complexity while maintaining 1.5A output capability without external switch. |
| Programmable soft-start | External capacitor on SS pin controls rise time of error amplifier reference, preventing output overshoot and inrush stress. |
| Thermal shutdown with hysteresis | 165°C trip with 25°C hysteresis ensures safe recovery after overtemperature events without oscillation. |
| Pre-charge assist (PRE pin) | 250ns open-drain pulse per cycle aids BST capacitor charging during light-load or pre-biased start-up conditions. |
Applications
| Industrial PLC Power Supply | Telecom Line Card Bias |
|---|---|
Use Scenario: Provides isolated 3.3V/5V rails from 24V or 48V backplane in programmable logic controllers with variable load profiles. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.5A continuous output with adjustable frequency to avoid noise coupling into analog I/O modules. Use Value: Emulated current mode ensures tight load transient response (<10µs recovery) and inherent line feed-forward for stable operation across 24V±20% input variation. | Use Scenario: Generates 12V intermediate rail for RF amplifiers and Ethernet PHYs on telecom line cards operating from -48V DC plant power. IC Role / Device Role / Timing Role: High-voltage buck converter stepping -48V (with appropriate polarity inversion) or +48V to 12V with SYNC pin enabling interleaved operation across multiple cards. Use Value: 42V absolute max rating and 6–42V operating range allow direct use with telecom bus voltages; HTSSOP-16EP package enables compact, thermally robust layout near heat-sensitive components. |
| Automotive Body Control Module | Test Equipment Auxiliary Rail |
Use Scenario: Supplies 5V/1.5A to microcontrollers and CAN transceivers in body control units exposed to 12V battery transients up to 40V. IC Role / Device Role / Timing Role: Input-transient-tolerant buck regulator with UVLO hysteresis (0.35V) and remote shutdown for system-level power sequencing. Use Value: Cycle-by-cycle current limit (2.1A typ) and thermal shutdown (165°C) protect against short-circuit faults during connector hot-plug events. | Use Scenario: Generates precision 1.8V or 2.5V auxiliary supply for ADC references and sensor biasing in automated test equipment with strict noise requirements. IC Role / Device Role / Timing Role: Low-noise buck regulator with external compensation (COMP/FB) and programmable frequency to avoid interference with sensitive measurement bands. Use Value: 1.5% reference accuracy and wide bandwidth error amplifier (3MHz GBW) support <0.1% output regulation stability over temperature and line variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25574MHX/NOPB | Same family, 42V/0.5A rating; lower current, identical pinout and feature set. | Suitable for lower-power subsystems where 1.5A headroom is unnecessary. | Select when output current demand is ≤500mA and board space or cost optimization is prioritized. |
| TPS54340DDAR | 42V/3.5A, current-mode control, SO-8 package; no RAMP/IS pins, different compensation scheme. | Better suited for higher-current, space-constrained designs where external diode is acceptable. | Choose when needing >1.5A output or SO-8 footprint compatibility, accepting trade-offs in emulated current-mode benefits. |
Compared with LM25574MHX/NOPB, the LM25575MHX/NOPB provides 3× higher output current in identical HTSSOP-16EP packaging; versus TPS54340DDAR, it offers superior noise-immune current sensing and easier loop compensation but requires more external components and larger layout area.
Availability
LM25575MHX/NOPB is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and automotive body electronics requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM25575MHX/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 LM25575MHX/NOPB belongs to TI's high-voltage buck regulator product line, engineered for robust DC/DC conversion in industrial, telecom, and automotive applications where wide input range, integrated FETs, and thermal resilience are critical.
FAQ
What is the maximum recommended output current for LM25575MHX/NOPB under continuous operation?
The LM25575MHX/NOPB is rated for 1.5A continuous output current across its full operating temperature range (–40°C to 125°C junction), assuming proper PCB thermal design with the exposed pad soldered to a minimum 1-in² copper area. Derating is required above 85°C ambient due to thermal limits; actual achievable current depends on input-output differential, switching frequency, and heatsinking.
Can LM25575MHX/NOPB operate with an input voltage below 6V?
No - the LM25575MHX/NOPB has a specified minimum input voltage of 6V per its Recommended Operating Conditions. Below this, the internal VCC regulator cannot sustain bias power, and the device will not start or remain operational. The VCC UVLO threshold is 5.35V (typ), confirming that reliable operation requires VIN ≥6V.
How does the RAMP pin function in LM25575MHX/NOPB, and what capacitor value should be used?
The RAMP pin in LM25575MHX/NOPB sources a voltage-controlled current (10µA/VIN–VOUT + 50µA) into an external capacitor to emulate the inductor current ramp. For stable operation, CRAMP ≈ L × 10⁻⁵ (L in henries); e.g., a 47µH inductor pairs with ~0.47nF. A 470pF ceramic capacitor is commonly used and placed adjacent to the RAMP and AGND pins.
Is LM25575MHX/NOPB pin-compatible with other devices in the LM2557x family?
Yes - LM25575MHX/NOPB shares identical HTSSOP-16EP pinout and functional mapping with LM25574MHX/NOPB and LM25576MHX/NOPB. This allows direct substitution within the same family for current-scaling purposes, provided external components (inductor, output capacitor, RT, RAMP) are re-evaluated for the new current/voltage requirements.
Does LM25575MHX/NOPB require an external Schottky diode, and why?
Yes - LM25575MHX/NOPB integrates only the high-side N-MOSFET switch and requires an external Schottky diode (e.g., CMSH3-60) connected from SW to PGND to provide the low-side conduction path during the switch off-time. This architecture avoids the complexity of synchronous rectification while maintaining efficiency at medium loads and simplifying thermal management.
LM25575MHX/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM25575MHX/NOPB FAQ
1.How can I place an order for LM25575MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25575MHX/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 LM25575MHX/NOPB reliable?
The price and inventory of LM25575MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25575MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25575MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25575MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25575MHX/NOPB?
LM25575MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25575MHX/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 LM25575MHX/NOPB?
For technical support, including LM25575MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25575MHX/NOPB requirements.
6.How does Aetrix verify that LM25575MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25575MHX/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 LM25575MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25575MHX/NOPB?
All LM25575MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25575MHX/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 LM25575MHX/NOPB part is unused and in its original packaging.
Return procedure for LM25575MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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