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Texas Instruments LM5576MHX/NOPB
- Part No.:
- LM5576MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5576MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,620
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Product details
Overview
LM5576MHX/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 50–500 kHz switching frequency. It delivers regulated output down to 1.225 V with 1.5% feedback reference accuracy and supports industrial power bus conversion in harsh environments.
For engineers reviewing the LM5576MHX/NOPB datasheet, LM5576MHX/NOPB pinout, LM5576MHX/NOPB application, or LM5576MHX/NOPB equivalent, key selection considerations include ultra-wide 6–75 V input range, thermal shutdown at 165°C, cycle-by-cycle current limiting, soft-start programmability, and HTSSOP-20EP package thermal performance (RθJA = 40°C/W).
Technical Context
The LM5576MHX/NOPB implements emulated current-mode control using a reconstructed ramp signal-generated via internal voltage-controlled current source and external RAMP capacitor-to eliminate leading-edge spikes and enable stable operation at low duty cycles. Its dual-mode VCC regulator maintains 7 V bias supply for VIN > 9 V while directly passing VIN for inputs below 9 V.
Functional integration includes cycle-by-cycle current limit, remote shutdown via SD pin with 0.7 V/1.225 V thresholds, SYNC pin for multi-device synchronization or external clock locking, and pre-charge assist (PRE) for bootstrap capacitor reliability under light-load or pre-biased conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 75 V - supports direct connection to industrial 24/48/72 V DC buses without pre-regulation. |
| Output Current | 3 A continuous - enables single-chip conversion for mid-power subsystems without external MOSFETs. |
| 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 RT resistor to optimize inductor size, efficiency, and EMI profile. |
| Junction Temperature | −40°C to +125°C - specifies full operational range for industrial ambient conditions. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor heatsinking without latch-up. |
| Buck Switch RDS(on) | 170 mΩ typical - determines conduction loss and thermal rise at full load (≈1.5 W dissipation @ 3 A). |
Pinout & Package
LM5576MHX/NOPB uses the HTSSOP-20EP (PWP) package: 6.5 mm × 4.4 mm body with exposed thermal pad (EP) soldered to PCB ground plane for enhanced heat dissipation (RθJB = 6.9°C/W). Pin numbering follows top-view layout with EP as thermal ground terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Bias regulator output | Supplies internal circuitry; requires 0.1–1 µF ceramic decoupling; accepts external 7.5–14 V supply to reduce IC dissipation. |
| 2 SD | Shutdown/standby control | 0.7 V threshold disables operation; 1.225 V enables regulation; internal 5 µA pullup allows open-circuit enable. |
| 3,4 VIN | Main input supply | Accepts 6–75 V; dual-mode VCC regulator auto-selects pass-through (<9 V) or LDO mode (>9 V). |
| 5 SYNC | Oscillator sync I/O | Enables multi-device synchronization or external clock locking; sink impedance 110 Ω, threshold 1.4 V (falling). |
| 6 COMP | Error amplifier output | Connects to FB via type-II compensation network (R/C) to stabilize loop response and reject noise. |
| 7 FB | Feedback input | Compares output voltage divider to 1.225 V reference; 10 nA bias current minimizes divider error. |
| 8 RT | Frequency set input | Resistor to AGND sets oscillator frequency per F = 1/(580n + 135p·R); placement critical for stability. |
| 9 RAMP | Emulated current ramp node | External capacitor sets slope; internal current source scales with (VIN − VOUT) for accurate current reconstruction. |
| 10 AGND | Analog ground reference | Separate from PGND; provides low-noise reference for error amp, comparator, and sensing circuits. |
| 11 SS | Soft-start timing node | 10 µA internal current charges external capacitor to ramp reference voltage and prevent inrush stress. |
| 12 OUT | Regulated output connection | Direct tie to output filter capacitor; low-impedance path critical for transient response and ripple suppression. |
| 13,14 PGND | Power ground return | Low-side return for IS sense resistor and PRE switch; must be star-connected to minimize noise coupling. |
| 15,16 IS | Diode current sense input | Measures re-circulating Schottky diode current near off-time end to reconstruct DC inductor current level. |
| 17,18 SW | Switching node | Source of internal buck MOSFET; connects to inductor and external Schottky diode anode; high dv/dt node. |
| 19 PRE | Bootstrap pre-charge assist | Open-drain output pulsed 265 ns before on-time to charge BST capacitor during light-load or pre-biased startup. |
| 20 BST | Bootstrap capacitor input | Connects to SW via 0.022 µF ceramic capacitor; supplies gate drive for high-side switch during on-time. |
| EP | Exposed thermal pad | Must be soldered to solid PCB ground plane; primary thermal path for junction-to-board conduction (RθJB = 6.9°C/W). |
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 applications. |
| Integrated 75 V / 170 mΩ MOSFET | Reduces BOM count and layout complexity; eliminates external high-voltage switch and driver design effort. |
| Adjustable soft-start (SS pin) | Prevents inrush current and output overshoot by controlling error amplifier reference ramp rate via external capacitor. |
| SYNC pin for multi-device coordination | Allows up to five LM5576MHX/NOPB units to synchronize without external clock generator-reduces beat-frequency EMI. |
| Thermal shutdown with hysteresis | 165°C trip point + 25°C hysteresis ensures safe recovery after overload or cooling; prevents repeated cycling during fault. |
| Pre-charge assist (PRE pin) | Improves bootstrap capacitor charging reliability during very light loads or when output is pre-biased before enable. |
Applications
| Industrial Power Supply | Telecom Line Card |
|---|---|
|
Use Scenario: Converting 48 V telecom bus to 3.3 V or 5 V for FPGA, DSP, and interface ICs on line cards operating in NEBS-compliant cabinets. IC Role / Device Role / Timing Role: Primary buck controller delivering 3 A regulated output with tight load transient response and EMI-controlled switching. Use Value: Eliminates need for intermediate 12 V stage; achieves >90% efficiency at full load while meeting EN 55022 Class B conducted emissions with proper layout. |
Use Scenario: Providing 12 V auxiliary rail from 72 V DC plant battery backup in central office switching equipment. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with UVLO and remote shutdown for system-level power sequencing and brownout protection. Use Value: Withstands 100 V transients per Telcordia GR-1089; SD pin enables coordinated shutdown during battery depletion or maintenance mode. |
| Railway Signaling System | Factory Automation PLC |
|
Use Scenario: Generating 24 V logic supply from 110 V DC traction power bus in onboard signaling modules compliant with EN 50121-3-2. IC Role / Device Role / Timing Role: Robust DC-DC converter with wide input range, thermal protection, and low EMI for safety-critical infrastructure. Use Value: 75 V absolute max rating accommodates 110 V nominal bus with 20% tolerance and surge margins; exposed pad ensures reliable thermal management in sealed enclosures. |
Use Scenario: Powering I/O modules and microcontrollers from 24 V industrial bus subject to motor switching noise and long cable drops. IC Role / Device Role / Timing Role: Input-filter-tolerant buck regulator with cycle-by-cycle current limit and fast transient recovery for noisy factory environments. Use Value: Emulated current mode delivers <50 µs load-step response; RAMP capacitor tuning compensates for inductor tolerance and improves current limit accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164MHX/NOPB | 4.5–65 V input, 1 A output, 1.225 V reference, same HTSSOP-20EP package but lower current rating and no IS pin. | Suitable for lower-power industrial sensors or isolated bias rails where 3 A is unnecessary. | Select LM5164MHX/NOPB only if output current ≤1 A and input voltage ≤65 V; not drop-in due to missing IS functionality and reduced thermal margin. |
| LM5165MHX/NOPB | 3–65 V input, 150 mA output, 1.215 V reference, 12-pin WSON package; integrates LDO post-regulator but lacks buck switch. | Targeted at ultra-low-power always-on subsystems requiring <200 mA with tighter voltage tolerance. | LM5165MHX/NOPB cannot replace LM5576MHX/NOPB in 3 A applications; use only for auxiliary low-current rails where efficiency at light load matters more than peak current. |
Compared with LM5164MHX/NOPB and LM5165MHX/NOPB, LM5576MHX/NOPB uniquely supports 75 V input and 3 A output in the same HTSSOP-20EP footprint, making it the sole option for high-voltage industrial buck conversion requiring both robustness and power density.
Availability
LM5576MHX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, railway signaling systems, and factory automation PLCs requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5576MHX/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 50 years of innovation in high-reliability power conversion.
The LM5576MHX/NOPB belongs to TI's high-voltage buck regulator product line, designed specifically for industrial, telecom, and transportation applications demanding wide input range, integrated power stages, and robust fault protection.
FAQ
What is the maximum input voltage rating for LM5576MHX/NOPB?
The LM5576MHX/NOPB has an absolute maximum input voltage rating of 76 V across VIN pins. Its recommended operating range is 6 V to 75 V, enabling direct connection to 48 V and 72 V industrial DC buses. Exceeding 76 V risks permanent damage, especially during transients-designers must include appropriate input clamping or filtering.
Does LM5576MHX/NOPB require an external MOSFET for operation?
No, LM5576MHX/NOPB integrates a 75 V, 170 mΩ N-channel buck switch, eliminating the need for external high-voltage MOSFETs. This integration reduces bill-of-materials count, simplifies layout, and improves efficiency at 3 A output. External components required are inductor, output capacitor, bootstrap capacitor, and compensation network.
How does the emulated current-mode architecture in LM5576MHX/NOPB improve performance?
The LM5576MHX/NOPB uses emulated current-mode control by reconstructing the inductor current ramp via internal current source and external RAMP capacitor-avoiding noisy switch-node sensing. This enables stable operation at very low duty cycles (<10%), reduces EMI susceptibility, and simplifies loop compensation compared to traditional current-mode controllers.
Can LM5576MHX/NOPB synchronize its switching frequency with other devices?
Yes, LM5576MHX/NOPB features a dedicated SYNC pin that supports both master-slave synchronization and external clock locking. Multiple LM5576MHX/NOPB units can be interconnected to self-synchronize, or driven by an external clock >50 kHz. This capability reduces beat-frequency EMI and enables deterministic timing in multi-rail power systems.
What thermal management provisions does LM5576MHX/NOPB include?
LM5576MHX/NOPB incorporates thermal shutdown at 165°C with 25°C hysteresis and uses the HTSSOP-20EP package with exposed thermal pad (EP). When soldered to a 4-layer PCB with ≥2 in² copper pour, it achieves RθJB = 6.9°C/W. Proper thermal vias under EP and minimal trace resistance between EP and ground plane are essential for maintaining 125°C max junction temperature at full load.
LM5576MHX/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM5576MHX/NOPB FAQ
1.How can I place an order for LM5576MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5576MHX/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 LM5576MHX/NOPB reliable?
The price and inventory of LM5576MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5576MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5576MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5576MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5576MHX/NOPB?
LM5576MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5576MHX/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 LM5576MHX/NOPB?
For technical support, including LM5576MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5576MHX/NOPB requirements.
6.How does Aetrix verify that LM5576MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5576MHX/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 LM5576MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5576MHX/NOPB?
All LM5576MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5576MHX/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 LM5576MHX/NOPB part is unused and in its original packaging.
Return procedure for LM5576MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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