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Texas Instruments LM5576MH/NOPB
- Part No.:
- LM5576MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5576MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,279
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Product details
Overview
LM5576MH/NOPB from Texas Instruments is a 75V input, 3A synchronous step-down switching regulator controller with integrated 75V/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.
For engineers reviewing the LM5576MH/NOPB datasheet, LM5576MH/NOPB pinout, LM5576MH/NOPB application, or LM5576MH/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 thermal performance.
Technical Context
The LM5576MH/NOPB implements emulated current-mode control using a reconstructed ramp signal-generated via internal voltage-controlled current source (IRAMP = (5 µA × (VIN − VOUT)) + 25 µA) and external RAMP capacitor-to eliminate leading-edge spikes and enable stable operation at very low duty cycles. Its dual-mode VCC regulator maintains ~7V bias for VIN > 9V and tracks VIN directly below 9V.
It features synchronized oscillator architecture with programmable RT resistor interface, SYNC pin capable of master/slave multi-device synchronization, and integrated protection including cycle-by-cycle current limit, thermal shutdown (165°C), and remote shutdown via SD pin with 0.7V/1.225V thresholds and 0.1V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 75 V - supports direct connection to industrial 24V/48V/72V bus rails without pre-regulation |
| Output Current | 3 A continuous - enables single-chip solution for mid-power industrial loads |
| Feedback Reference | 1.225 V ±1.5% - sets minimum output voltage and defines regulation precision across temperature |
| Switching Frequency | 50 kHz to 500 kHz - adjustable via single RT resistor to optimize efficiency vs. size trade-off |
| MOSFET RDS(on) | 170 mΩ typical - limits conduction loss in high-voltage buck stage; max 340 mΩ over temp |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents permanent damage during overload or poor heatsinking |
| Soft-Start Current | 10 µA nominal - controls ramp rate of external SS capacitor to limit inrush current |
Pinout & Package
LM5576MH/NOPB uses a thermally enhanced HTSSOP-20EP (PWP) package measuring 6.5 mm × 4.4 mm with exposed die attach pad for PCB-level thermal dissipation. The exposed pad must be soldered to a solid ground plane per TI design guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (pins 3,4) | High-voltage input supply | Accepts 6–75V unregulated input; dual-mode VCC regulator derives bias from this rail |
| BST (pin 20) | Bootstrap capacitor connection | Connects to SW via 0.022 µF ceramic capacitor to drive high-side gate of internal MOSFET |
| SW (pins 17,18) | Switching node | Drives external Schottky diode and buck inductor; source terminal of internal N-MOSFET |
| FB (pin 7) | Feedback input | Connects to resistor divider from VOUT; comparator threshold is precisely 1.225 V |
| SS (pin 11) | Soft-start control | 10 µA current source charges external capacitor to ramp reference voltage gradually |
| RT (pin 8) | Oscillator frequency set | Single resistor to AGND programs switching frequency from 50–500 kHz |
| SYNC (pin 5) | Oscillator synchronization I/O | Enables multi-device synchronization or external clock locking; open-drain compatible |
| SD (pin 2) | Shutdown/standby control | Three-state logic: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active operation |
| IS (pins 15,16) | Diode current sense | Measures re-circulating diode current to reconstruct DC level of inductor current |
| RAMP (pin 9) | Emulated current ramp generator | External capacitor sets slope; internal current source scales with (VIN − VOUT) for accurate PWM timing |
| PGND (pins 13,14) | Power ground return | Low-impedance return path for IS sense resistor and PRE switch; separate from AGND |
| AGND (pin 10) | Analog ground reference | Reference for FB, COMP, RT, RAMP, SS; must be star-connected to minimize noise coupling |
| COMP (pin 6) | Error amplifier output | Connects to type-II compensation network between COMP and FB for loop stability |
| OUT (pin 12) | Regulated output connection | Direct tie to output capacitor; not a power output but voltage sensing reference point |
| VCC (pin 1) | Bias regulator output | Supplies internal circuitry; regulated to ~7 V for VIN > 9 V; requires 0.1–1 µF ceramic decoupling |
| PRE (pin 19) | Bootstrap pre-charge assist | Open-drain output pulsed 265 ns before switch-on to charge BST capacitor under light-load conditions |
| EP | Exposed thermal pad | Must be soldered to PCB ground plane; primary thermal path for 40°C/W junction-to-ambient dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode control | Eliminates current-sense noise and propagation delay, enabling stable regulation at sub-10% duty cycles in high-VIN applications |
| Programmable switching frequency | 50–500 kHz via single RT resistor allows optimization of magnetic size, efficiency, and EMI filtering requirements |
| Multi-device synchronization | SYNC pin supports daisy-chain or master-slave configuration of up to five LM5576MH/NOPB units without external clock generator |
| Integrated protection suite | Cycle-by-cycle current limit, thermal shutdown (165°C), and remote shutdown via SD pin ensure robust field operation |
| Thermally enhanced HTSSOP-20EP | Exposed pad reduces θJA to 40°C/W and θJB to 6.9°C/W, enabling 3A output without heatsink in properly laid-out PCBs |
Applications
| Industrial Power Supply | Telecom Line Card |
|---|---|
Use Scenario: Converting 48V telecom bus to 3.3V/5V for FPGA, DSP, and interface ICs on line cards. IC Role / Device Role / Timing Role: Primary buck controller regulating intermediate bus voltage with tight load transient response. Use Value: Emulated current mode ensures stable regulation during burst-mode traffic transients without compensation redesign. | Use Scenario: Generating 12V auxiliary rail from 72V industrial battery or PoE++ infrastructure. IC Role / Device Role / Timing Role: High-input-voltage step-down controller delivering 3A continuous current with minimal external components. Use Value: 75V rating and integrated 170mΩ MOSFET eliminate need for external HV FET and reduce BOM count by 3–5 parts. |
| Railway Signaling System | Test Equipment Power Module |
Use Scenario: Powering microcontrollers and sensors in EN50155-compliant signaling systems operating from 72V nominal traction supply. IC Role / Device Role / Timing Role: Main DC-DC converter handling wide input variation (40–100V) due to regenerative braking and cold-cranking events. Use Value: 6–75V input range and 165°C thermal shutdown ensure uninterrupted operation across railway environmental extremes. | Use Scenario: Programmable bench power supply channel supporting variable output from 1.225V to 30V at up to 3A. IC Role / Device Role / Timing Role: Adjustable-output buck controller with precise 1.225V reference and soft-start for controlled ramp-up. Use Value: 1.5% reference accuracy and external RT/RAMP tuning enable repeatable, calibrated output voltage across production units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5117MH/NOPB | Higher 100V input rating; external high-side FET drive; no integrated MOSFET | Suitable for >75V inputs or higher-current designs requiring discrete FETs | Select when input exceeds 75V or when thermal/power needs exceed 3A continuous |
| LM5164QDDARQ1 | Automotive-grade AEC-Q100; 65V max input; integrated 0.55Ω FET; lower 1A output | Designed for automotive infotainment and ADAS subsystems with strict qualification | Select only for automotive applications requiring AEC-Q100 qualification and lower power |
Compared with LM5576MH/NOPB, LM5117MH/NOPB offers extended input voltage and flexibility for higher-power discrete designs, while LM5164QDDARQ1 provides automotive qualification at reduced voltage and current capability-neither is pin-compatible, and both require layout and compensation changes.
Availability
LM5576MH/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, railway signaling systems, and test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5576MH/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 decades of leadership in high-reliability power conversion ICs.
The LM5576 product line targets high-input-voltage industrial and telecom DC-DC conversion, delivering robust, easy-to-design 3A buck controllers with integrated FETs and advanced emulated current-mode control.
FAQ
What is the maximum input voltage rating for LM5576MH/NOPB?
The LM5576MH/NOPB has an absolute maximum input voltage rating of 76 V, with recommended operating range from 6 V to 75 V. Operation above 75 V risks exceeding safe operating area limits and triggering overvoltage protection. Transient ringing on the VIN line must be suppressed with proper input capacitance and layout to avoid exceeding the 76 V absolute maximum, especially during hot-plug or load-dump events.
Does LM5576MH/NOPB include an integrated power MOSFET?
Yes, the LM5576MH/NOPB integrates a 75 V, 170 mΩ N-channel MOSFET rated for 3 A continuous output current. This eliminates the need for an external high-voltage switch and simplifies design for mid-power industrial buck converters. The MOSFET is used as the high-side switch in the buck topology, with SW pins connecting directly to the inductor and external Schottky diode.
How is the switching frequency set on LM5576MH/NOPB?
The switching frequency of LM5576MH/NOPB is set using a single external resistor connected between the RT pin and AGND. The relationship is defined by RT = (1/F − 580 ns) / 135 ps, yielding frequencies from 50 kHz to 500 kHz. For example, a 32.4 kΩ resistor sets ~200 kHz. The RT resistor must be placed adjacent to the IC with short traces to minimize noise coupling into the oscillator circuit.
What thermal management guidance applies to LM5576MH/NOPB?
LM5576MH/NOPB requires connection of its exposed thermal pad (EP) to a large PCB copper pour tied to PGND for effective heat dissipation. With proper layout, its junction-to-board thermal resistance is 6.9°C/W, enabling 3 A operation without a heatsink at ambient temperatures ≤85°C. Thermal shutdown activates at 165°C with 25°C hysteresis to protect against sustained overload or inadequate cooling.
Can multiple LM5576MH/NOPB devices be synchronized?
Yes, LM5576MH/NOPB supports synchronization of multiple units via the SYNC pin. Connecting SYNC pins together enables self-synchronization, where the highest-frequency device acts as master. Alternatively, an external clock can drive the SYNC pin to lock all devices to a common frequency-required pulse width is ≥15 ns, and interface should use open-drain drivers to avoid contention.
LM5576MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM5576MH/NOPB FAQ
1.How can I place an order for LM5576MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5576MH/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 LM5576MH/NOPB reliable?
The price and inventory of LM5576MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5576MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM5576MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5576MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5576MH/NOPB?
LM5576MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5576MH/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 LM5576MH/NOPB?
For technical support, including LM5576MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5576MH/NOPB requirements.
6.How does Aetrix verify that LM5576MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5576MH/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 LM5576MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM5576MH/NOPB?
All LM5576MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5576MH/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 LM5576MH/NOPB part is unused and in its original packaging.
Return procedure for LM5576MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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