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Texas Instruments LM25576Q0MHX/NOPB
- Part No.:
- LM25576Q0MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25576Q0MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM25576Q0MHX/NOPB from Texas Instruments is a 42-V, 3-A synchronous step-down switching regulator with integrated 170-mΩ N-channel MOSFET, emulated current-mode control, adjustable 50 kHz–1 MHz switching frequency, and 1.225 V feedback reference. It delivers robust power conversion for industrial bus supplies requiring wide-input, high-efficiency DC/DC regulation.
For engineers reviewing the LM25576Q0MHX/NOPB datasheet, LM25576Q0MHX/NOPB pinout, LM25576Q0MHX/NOPB application, or LM25576Q0MHX/NOPB equivalent, key selection considerations include input voltage range (6–42 V), soft-start programmability, SYNC capability for multi-regulator coordination, thermal shutdown at 165°C, and HTSSOP-20EP package with exposed pad for thermal management.
Technical Context
The LM25576Q0MHX/NOPB implements emulated current-mode control using a reconstructed ramp signal derived from VIN–VOUT and a diode-current sample-and-hold DC level-eliminating leading-edge spikes and enabling stable operation at low duty cycles. Its dual-mode VCC regulator tracks VIN up to 9 V then regulates to 7 V, supporting 6–42 V input while minimizing internal dissipation.
Functional modes include three-level SD pin control (shutdown <0.7 V, standby 0.7–1.225 V, active >1.225 V), master/slave synchronization via open-drain SYNC pin, and cycle-by-cycle current limiting triggered at 2.1 A typical. The RAMP pin accepts an external capacitor (50–2000 pF) to set emulated ramp slope, with built-in 25 µA offset for subharmonic oscillation suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports wide industrial and telecom bus rails without pre-regulation |
| Output Current | 3 A continuous - enables single-chip solutions for mid-power point-of-load applications |
| Feedback Reference | 1.225 V ±1.5% - sets precise output voltage with external resistor divider |
| Switching Frequency | 50 kHz to 1 MHz - adjustable via RT-to-AGND resistor for size/efficiency trade-off |
| Current Limit Threshold | 2.1 A typical - provides cycle-by-cycle overcurrent protection with fast response |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents damage during overload or poor heatsinking |
| Soft-Start Current | 10 µA typical - controls output voltage ramp rate via external SS capacitor |
Pinout & Package
LM25576Q0MHX/NOPB uses the HTSSOP-20EP (exposed pad) package, 6.50 mm × 4.40 mm, with thermal pad soldered to PCB ground plane for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (3,4) | Power input | Accepts 6–42 V supply; connects to input bulk capacitor and internal VCC regulator |
| VCC (1) | Bias supply output | Provides 7 V regulated bias for control circuitry; requires 0.1–1 µF ceramic decoupling |
| SW (17,18) | Switch node | Drives external Schottky diode and buck inductor; high dv/dt node requiring tight layout |
| BST (20) | Bootstrap supply | Connects to SW via 0.022 µF ceramic capacitor to drive high-side gate of internal MOSFET |
| PGND (13,14) | Power ground return | Low-side reference for switch and IS sense resistor; separate from AGND for noise isolation |
| AGND (10) | Analog ground | Reference for FB, COMP, RT, RAMP, SS - must be star-connected to minimize noise coupling |
| FB (7) | Feedback input | Connects to resistor divider from OUT; regulates output when voltage = 1.225 V |
| COMP (6) | Error amplifier output | Interface for type-II compensation network between COMP and FB pins |
| RT (8) | Oscillator set | Resistor to AGND sets switching frequency; value determines timing accuracy and EMI profile |
| RAMP (9) | Emulated ramp control | External capacitor to AGND sets slope; enables stable current-mode control without sensing noise |
| SS (11) | Soft-start control | Capacitor to AGND sets output voltage rise time; held low during fault conditions |
| SYNC (5) | Frequency sync I/O | Open-drain pin for master/slave synchronization; accepts external clock or ties multiple ICs together |
| SD (2) | Shutdown control | Three-state logic: <0.7 V = shutdown, 0.7–1.225 V = standby, >1.225 V = active |
| IS (15,16) | Diode current sense | Measures re-circulating diode current for DC level of emulated ramp; connects to diode anode |
| PRE (19) | Bootstrap pre-charge | Open-drain assist for BST capacitor charging under light load or pre-biased output conditions |
| OUT (12) | Regulated output | Connects directly to output filter inductor and capacitor; high-current path requiring low-impedance routing |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode architecture | Eliminates current-sense noise and propagation delay, enabling stable regulation at <10% duty cycle in high-VIN/low-VOUT applications |
| Integrated 42-V, 170-mΩ N-channel MOSFET | Reduces BOM count and layout complexity while maintaining 3 A output capability without external switch |
| Adjustable soft-start via SS pin | Prevents inrush current and output overshoot by controlling reference ramp with external capacitor |
| Master/slave synchronization via SYNC pin | Enables phase-aligned operation of multiple regulators to reduce input ripple and EMI peak amplitude |
| Dual-mode VCC regulator | Tracks VIN ≤9 V for efficiency, regulates to 7 V above 9 V - minimizes internal power loss across full input range |
| Thermal shutdown with hysteresis | Shuts down at 165°C and restarts only after cooling to 140°C - prevents thermal runaway during sustained overload |
Applications
| Industrial Power Supply | Telecom Bus Converter |
|---|---|
Use Scenario: Converting 24 V or 48 V distribution rail to 3.3 V or 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck controller delivering regulated low-voltage rails with high line/load transient immunity. Use Value: Wide 6–42 V input accommodates brownout and surge conditions on factory floor power buses. | Use Scenario: Stepping down -48 V telecom battery backup to +12 V for optical transceiver modules. IC Role / Device Role / Timing Role: High-reliability DC/DC converter operating in harsh temperature environments with strict efficiency targets. Use Value: 165°C thermal shutdown and 1.225 V reference accuracy ensure stable operation across -40°C to +85°C ambient. |
| Automotive Body Control Module | Test Equipment Power Rail |
Use Scenario: Generating 5 V and 3.3 V from 12 V battery (with cold-crank tolerance down to 6 V). IC Role / Device Role / Timing Role: Main power supply IC managing multiple subsystem voltages with remote enable/disable. Use Value: Three-level SD pin allows coordinated startup/shutdown sequencing with microcontroller GPIO. | Use Scenario: Providing clean, adjustable 1.8–15 V outputs for benchtop DUT power in automated test systems. IC Role / Device Role / Timing Role: Programmable lab-grade supply core with SYNC for synchronized multi-rail testing. Use Value: RT-resistor tuning and SYNC capability enable precise frequency matching across parallel channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25575Q0MHX/NOPB | Same pinout and features but lacks SYNC pin; fixed 200 kHz frequency | Suitable for cost-sensitive single-regulator designs where synchronization is unnecessary | Select when multi-device coordination is not required and board space permits fixed-frequency design |
| LM5117QPWPRQ1 | 42 V, 5 A controller (external FETs); supports higher current and wider frequency range (100 kHz–1 MHz) | Used in automotive ADAS and infotainment systems requiring AEC-Q100 Grade 1 qualification | Choose for >3 A loads or AEC-Q100 compliance; requires external high-side/lower FETs and gate drivers |
Compared with LM25576Q0MHX/NOPB, LM25575Q0MHX/NOPB simplifies design at the cost of flexibility, while LM5117QPWPRQ1 trades integration for scalability and automotive qualification - making LM25576Q0MHX/NOPB optimal for balanced performance, integration, and industrial reliability.
Availability
LM25576Q0MHX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom bus converters, automotive body control modules, and test equipment power rails requiring stable component supply and long-term manufacturability.
Supply support for LM25576Q0MHX/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 specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive ICs.
The LM25576 product line delivers easy-to-use, high-voltage buck regulators targeting industrial automation, telecom infrastructure, and transportation systems where wide-input operation and robust protection are critical.
FAQ
What is the maximum input voltage rating for LM25576Q0MHX/NOPB?
The absolute maximum input voltage for LM25576Q0MHX/NOPB is 45 V, though recommended operating range is 6 V to 42 V. Exceeding 45 V risks permanent damage. During transients, input ringing must be suppressed with proper PCB layout and local bypass capacitors to prevent violation of this rating. The device's internal VCC regulator ensures stable bias operation across the full 6–42 V range.
How does the RAMP pin function in LM25576Q0MHX/NOPB?
The RAMP pin in LM25576Q0MHX/NOPB accepts an external capacitor to AGND that sets the slope of the emulated current ramp used in PWM comparison. The internal current source generates IRAMP = (5 µA × (VIN – VOUT)) + 25 µA, and CRAMP scales the ramp to match the 0.5 V/A DC level from the IS-sensed diode current. This eliminates noise-prone direct current sensing while enabling stable operation at very low duty cycles.
Can LM25576Q0MHX/NOPB synchronize with external clock sources?
Yes, LM25576Q0MHX/NOPB supports external clock synchronization via its SYNC pin, which operates as an open-drain input/output. An external clock with frequency higher than the free-running oscillator (set by RT) can drive the SYNC pin to align switching edges. Multiple LM25576Q0MHX/NOPB devices can also self-synchronize by connecting their SYNC pins - the highest-frequency unit acts as master.
What is the purpose of the PRE pin on LM25576Q0MHX/NOPB?
PRE (Pre-charge) is an open-drain output on LM25576Q0MHX/NOPB that assists bootstrap capacitor charging during light-load conditions or when the output is pre-biased before startup. It activates for 265 ns per cycle just before the main switch on-time, pulling SW low to charge the BST capacitor through the internal pre-charge MOSFET - ensuring reliable high-side gate drive even with minimal load current.
Does LM25576Q0MHX/NOPB require external components for basic operation?
Yes, LM25576Q0MHX/NOPB requires several external components for full functionality: input/output capacitors, buck inductor, Schottky diode, BST capacitor (0.022 µF), RT resistor (for frequency setting), SS capacitor (for soft-start), and FB resistor divider (to set output voltage). Optional components include RAMP capacitor, SYNC pull-up, and PRE-to-SW connection. No external gate driver or current-sense resistor is needed due to full integration.
LM25576Q0MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 20-PowerTSSOP (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:
- 3A
- 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:
- 20-HTSSOP
LM25576Q0MHX/NOPB FAQ
1.How can I place an order for LM25576Q0MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25576Q0MHX/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 LM25576Q0MHX/NOPB reliable?
The price and inventory of LM25576Q0MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25576Q0MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25576Q0MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25576Q0MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25576Q0MHX/NOPB?
LM25576Q0MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25576Q0MHX/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 LM25576Q0MHX/NOPB?
For technical support, including LM25576Q0MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25576Q0MHX/NOPB requirements.
6.How does Aetrix verify that LM25576Q0MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25576Q0MHX/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 LM25576Q0MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25576Q0MHX/NOPB?
All LM25576Q0MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25576Q0MHX/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 LM25576Q0MHX/NOPB part is unused and in its original packaging.
Return procedure for LM25576Q0MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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