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Texas Instruments LM5576QMHX/NOPB
- Part No.:
- LM5576QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5576QMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,715
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Product details
Overview
LM5576QMHX/NOPB from Texas Instruments is a 75V input, 3A synchronous step-down switching regulator with integrated 170mΩ N-channel MOSFET, emulated current-mode control, and adjustable 50–500kHz switching frequency. It delivers regulated output as low as 1.225V with 1.5% feedback reference accuracy and supports industrial power bus conversion in harsh environments.
For engineers reviewing the LM5576QMHX/NOPB datasheet, LM5576QMHX/NOPB pinout, LM5576QMHX/NOPB application, or LM5576QMHX/NOPB equivalent, key selection criteria include ultra-wide 6–75V input range, thermal shutdown at 165°C, cycle-by-cycle current limiting, soft-start programmability, and HTSSOP-20EP package with exposed thermal pad for high-power-density designs.
Technical Context
The LM5576QMHX/NOPB implements emulated current-mode control using a reconstructed ramp signal-generated via internal diode current sampling (IS pin) and voltage-controlled current source (RAMP pin)-to eliminate leading-edge spikes and enable stable regulation at very low duty cycles. Its dual-mode VCC regulator operates in LDO mode below 9V VIN and switches to 7V-regulated mode above 9V, enabling seamless operation across 6–75V input.
Frequency is set by a single RT resistor (50–500kHz), and synchronization is supported via open-drain SYNC pin that allows master-slave coordination of multiple LM5576QMHX/NOPB units or external clock locking. Protection includes cycle-by-cycle current limit, thermal shutdown (165°C), remote shutdown (SD pin with 0.7V/1.225V thresholds), and bootstrap UVLO (3.8V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 75 V - supports direct connection to industrial 24V/48V/72V buses without pre-regulation |
| Output Current | 3 A continuous - sufficient for powering FPGA I/O banks, PLC I/O modules, or motor control logic |
| Feedback Reference | 1.225 V ±1.5% - enables precise low-voltage rail generation (e.g., 1.2V, 1.8V, 3.3V) with minimal external divider error |
| Switching Frequency | 50 kHz to 500 kHz - adjustable via single RT resistor to balance efficiency vs. size (e.g., 200 kHz for 33 µH inductor) |
| MOSFET RDS(on) | 170 mΩ typical - reduces conduction loss at 3A, enabling >90% efficiency at 48V→12V conversion |
| Junction Temperature Range | −40°C to +125°C - qualified for extended industrial ambient conditions without derating |
| Thermal Resistance θJA | 40 °C/W - requires PCB thermal pad connection to ground plane for full 3A capability in sealed enclosures |
Pinout & Package
LM5576QMHX/NOPB uses a thermally enhanced HTSSOP-20EP (PWP) package measuring 6.5 mm × 4.4 mm with an exposed die attach pad (EP) soldered to PCB ground for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (pins 3,4) | Main power input | Accepts 6–75V unregulated supply; dual-mode VCC regulator derives bias from this rail |
| SW (pins 17,18) | Switch node | Connects to buck inductor and external Schottky diode anode; carries high dv/dt switching waveform |
| FB (pin 7) | Feedback input | Inverting input of error amplifier; tied to resistor divider on output to regulate at 1.225V reference |
| COMP (pin 6) | Error amplifier output | External type-II compensation network connects here to stabilize loop response |
| RT (pin 8) | Oscillator frequency set | Single resistor to AGND sets switching frequency; placement must be adjacent to IC |
| IS (pins 15,16) | Diode current sense | Measures re-circulating diode current to reconstruct DC level of inductor current for emulated ramp |
| RAMP (pin 9) | Emulated ramp generator | External capacitor sets slope; internal current source scales with (VIN − VOUT) for accurate current modeling |
| SD (pin 2) | Shutdown/standby control | Three-state logic: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active; internal 5µA pullup if floating |
| BST (pin 20) | Bootstrap supply | Connects to SW via 0.022µF ceramic capacitor to drive high-side MOSFET gate during on-time |
| PGND (pins 13,14) | Power ground return | Low-impedance return path for IS sense resistor and PRE switch; separate from AGND |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode control | Eliminates need for current-sense resistor and RC snubber; enables stable operation at <5% duty cycle in 72V→3.3V applications |
| Adjustable soft-start | 10 µA internal current source charges external SS capacitor to prevent inrush current and output overshoot during power-up |
| Controller synchronization | SYNC pin supports daisy-chained multi-phase operation or external clock lock to reduce EMI peak emissions |
| Integrated 75V/170mΩ MOSFET | Reduces BOM count by eliminating external high-voltage switch; rated for 3A continuous with thermal foldback |
| Exposed thermal pad (EP) | Enables 6.9°C/W junction-to-board thermal resistance when soldered to 4-layer PCB ground plane, supporting full 3A load at 85°C ambient |
Applications
| Industrial Power Supply | Telecom Line Card |
|---|---|
Use Scenario: Converting 48V telecom bus to 5V/3.3V for digital signal processors and interface ICs in base station line cards. IC Role / Device Role / Timing Role: Primary buck controller regulating intermediate rails with tight transient response and EMI-controlled switching. Use Value: Emulated current mode ensures stable regulation under rapid load steps (e.g., burst-mode DSP activity), while SYNC pin enables interleaving with other regulators to lower input ripple. | Use Scenario: Generating 12V auxiliary rail from 72V industrial battery backup system for PLC communication modules. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator with UVLO hysteresis and thermal protection for mission-critical infrastructure. Use Value: 6–75V input range accepts wide battery voltage swing; SD pin enables coordinated shutdown during brownout; 165°C thermal shutdown prevents field failure. |
| Motor Drive Logic Supply | Test Equipment Power Module |
Use Scenario: Providing isolated 15V gate drive and 5V logic supply from 24V factory automation bus for servo motor controllers. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter delivering clean, well-regulated auxiliary rails with minimal external components. Use Value: HTSSOP-20EP package fits dense motor control PCBs; RAMP/IS architecture rejects noise from nearby IGBT switching, improving regulation stability. | Use Scenario: Embedded power stage in automated test equipment requiring precise, programmable 3.3V/1.2V rails with fast turn-on sequencing. IC Role / Device Role / Timing Role: Programmable-frequency buck regulator supporting WEBENCH®-designed custom topologies with soft-start and fault reporting. Use Value: RT resistor tuning enables optimization for low-noise or high-efficiency modes; SS pin allows controlled power-up timing relative to FPGA configuration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5575QMHX/NOPB | Same family, 1.5A output rating; identical pinout, features, and 6–75V input range | Suitable where load current ≤1.5A; smaller inductor and output cap required | Select when full 3A capability is unnecessary-reduces solution size and cost without redesign |
| LM61460QPWRQ1 | Automotive-qualified 60V/6A buck; 2.1MHz fixed frequency; different pinout and control architecture | Requires layout change; supports higher frequency for smaller magnetics but lacks emulated current mode | Choose for AEC-Q100 compliance and higher current; not drop-in-requires new compensation and layout |
Compared with LM5575QMHX/NOPB, the LM5576QMHX/NOPB delivers double the output current in identical footprint; versus LM61460QPWRQ1, it offers superior low-duty-cycle stability and industrial temperature range but at lower switching frequency and without automotive qualification.
Availability
LM5576QMHX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, motor drive logic supplies, and test equipment power modules requiring stable component supply across long production lifecycles.
Supply support for LM5576QMHX/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 over 90 years of innovation in industrial and automotive electronics.
The LM5576QMHX/NOPB belongs to TI's high-voltage buck regulator product line, engineered specifically for robust, low-component-count DC/DC conversion in industrial automation, energy infrastructure, and transportation systems operating from 6V to 75V input rails.
FAQ
What is the maximum input voltage rating for LM5576QMHX/NOPB?
The absolute maximum input voltage for LM5576QMHX/NOPB is 76 V, with recommended continuous operation up to 75 V. Exceeding 76 V risks permanent damage due to internal transistor breakdown. During transients, proper input filtering and layout-especially placement of bulk and ceramic capacitors near VIN and GND pins-is essential to suppress ringing that could breach this limit. The device's dual-mode VCC regulator ensures reliable startup even at minimum 6 V input.
How does the emulated current-mode control in LM5576QMHX/NOPB differ from traditional current-mode control?
LM5576QMHX/NOPB avoids direct high-side switch current sensing by reconstructing the inductor current waveform: a sample-and-hold circuit captures diode current (via IS pin) for DC level, while an internal current source (RAMP pin) generates a voltage-controlled ramp proportional to (VIN − VOUT). This eliminates leading-edge spikes, measurement delays, and blanking requirements-enabling stable regulation at sub-5% duty cycles common in high-input, low-output applications like 72V→3.3V conversion.
Can LM5576QMHX/NOPB synchronize with external clock sources?
Yes, LM5576QMHX/NOPB supports external clock synchronization via its open-drain SYNC pin. An external clock with frequency higher than the LM5576QMHX/NOPB's free-running oscillator (set by RT) can be connected through a pulldown device. Pulse width must exceed 15 ns, and the SYNC pin tolerates up to 14 V. Multiple LM5576QMHX/NOPB units can also self-synchronize by tying their SYNC pins together-the highest-frequency unit acts as master, reducing EMI through deterministic phase alignment.
What thermal management is required for full 3A operation of LM5576QMHX/NOPB?
Full 3A continuous output from LM5576QMHX/NOPB requires connection of the exposed thermal pad (EP) to a multilayer PCB ground plane with ≥4 thermal vias (0.3mm diameter, filled or plated). With this, junction-to-board thermal resistance drops to 6.9°C/W, allowing operation at 125°C junction temperature in 85°C ambient. Without EP connection, θJA rises to 40°C/W, limiting practical output current to ~1.8A at same ambient. Thermal shutdown activates at 165°C with 25°C hysteresis.
Is LM5576QMHX/NOPB pin-compatible with other devices in the LM557x family?
Yes, LM5576QMHX/NOPB shares identical HTSSOP-20EP (PWP) pinout and functionality with LM5575QMHX/NOPB (1.5A version) and LM5574QMHX/NOPB (1A version), enabling scalable design reuse. All three support same RT, RAMP, SS, and SYNC configurations, and identical protection features. No PCB changes are required when upgrading from LM5575QMHX/NOPB to LM5576QMHX/NOPB-only inductor, output capacitor, and Schottky diode ratings need verification for 3A operation.
LM5576QMHX/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:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 70V
- Current - Output:
- 3A
- Frequency - Switching:
- 50kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM5576QMHX/NOPB FAQ
1.How can I place an order for LM5576QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5576QMHX/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 LM5576QMHX/NOPB reliable?
The price and inventory of LM5576QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5576QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5576QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5576QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5576QMHX/NOPB?
LM5576QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5576QMHX/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 LM5576QMHX/NOPB?
For technical support, including LM5576QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5576QMHX/NOPB requirements.
6.How does Aetrix verify that LM5576QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5576QMHX/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 LM5576QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5576QMHX/NOPB?
All LM5576QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5576QMHX/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 LM5576QMHX/NOPB part is unused and in its original packaging.
Return procedure for LM5576QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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