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Texas Instruments LM5576QMH/NOPB
- Part No.:
- LM5576QMH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5576QMH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,854
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Product details
Overview
LM5576QMH/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 LM5576QMH/NOPB datasheet, LM5576QMH/NOPB pinout, LM5576QMH/NOPB application, or LM5576QMH/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 (RθJA = 40°C/W).
Technical Context
The LM5576QMH/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 maintains ~7V bias supply for VIN > 9V and tracks VIN directly below 9V.
Frequency is set by a single RT-to-AGND resistor (50–500kHz), and synchronization is supported via open-drain SYNC pin capable of self-synchronizing multiple devices or locking to external clocks ≥15ns pulse width. Protection includes cycle-by-cycle current limit, thermal shutdown (165°C, 25°C hysteresis), and remote shutdown via SD pin with 0.7V/1.225V thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 75V - supports direct connection to industrial 24V/48V/72V buses without pre-regulation |
| Output Current | 3A continuous - enabled by integrated 170mΩ N-channel MOSFET and exposed-pad HTSSOP thermal design |
| Feedback Reference | 1.225V ±1.5% - sets minimum output voltage and defines regulation precision across –40°C to 125°C |
| Switching Frequency | 50kHz to 500kHz - adjustable via RT resistor; enables trade-off between inductor size and efficiency |
| Junction Temperature Range | –40°C to 125°C - validated operating range for industrial ambient conditions |
| Thermal Shutdown Threshold | 165°C - protects against sustained overload or poor PCB heatsinking; 25°C hysteresis prevents oscillation |
| Soft-Start Current | 10µA typical - controls rise time of external SS capacitor to limit inrush current during startup |
Pinout & Package
LM5576QMH/NOPB uses a thermally enhanced HTSSOP-20EP (PWP) package measuring 6.5mm × 4.4mm with an exposed die attach pad (EP) soldered to PCB ground plane for optimal thermal dissipation (RθJB = 6.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Bias regulator output | Supplies internal circuitry; regulated to ~7V for VIN > 9V; requires 0.1–1µF ceramic decoupling |
| 2 SD | Shutdown/standby control input | 0.7V threshold disables operation; 1.225V enables full regulation; internal 5µA pullup if left floating |
| 3,4 VIN | Main power input | Accepts 6–75V; dual-mode VCC regulator reduces dissipation at high input voltages |
| 5 SYNC | Oscillator sync I/O | Open-drain pin enabling multi-device synchronization or external clock locking (min 15ns pulse) |
| 6 COMP | Error amplifier output | Connects to FB via type-II compensation network to stabilize loop response |
| 7 FB | Feedback input | Senses output voltage divider; referenced to precise 1.225V internal bandgap |
| 8 RT | Frequency set input | Resistor to AGND programs oscillator frequency (50–500kHz) per TI Equation 1 |
| 9 RAMP | Emulated current ramp node | External capacitor sets slope; internal current source reconstructs inductor current without sensing noise |
| 10 AGND | Analog ground reference | Low-noise return for FB, COMP, RT, RAMP; must be separated from PGND in layout |
| 11 SS | Soft-start timing node | 10µA current source charges external capacitor to control output voltage ramp rate |
| 12 OUT | Regulated output connection | Direct connection point for output capacitor and load; not internally switched |
| 13,14 PGND | Power ground return | Low-side reference for IS sense resistor and PRE switch; ties to PCB ground plane under EP |
| 15,16 IS | Diode current sense input | Measures re-circulating Schottky diode current to generate DC level of emulated ramp |
| 17,18 SW | Switching node | Source of internal buck MOSFET; connects to external inductor and Schottky diode anode |
| 19 PRE | Bootstrap pre-charge assist | Open-drain output pulsed 265ns before each on-time to aid BST capacitor charging at light loads |
| 20 BST | Bootstrap capacitor input | Requires 0.022µF ceramic cap to SW; supplies gate drive for high-side switch during on-time |
| EP | Exposed thermal pad | Mandatory connection to PCB ground plane for thermal management; improves RθJB to 6.9°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode architecture | Eliminates need for current-sense resistor and associated noise filtering; enables stable operation at <10% duty cycle |
| Integrated 75V/170mΩ N-channel MOSFET | Reduces BOM count and layout complexity while delivering 3A continuous output with minimal conduction loss |
| Adjustable soft-start (SS pin) | 10µA current source + external capacitor allows precise control of output voltage ramp time to prevent inrush damage |
| Controller-level synchronization (SYNC pin) | Enables deterministic phase alignment of multiple LM5576QMH/NOPB regulators to reduce input ripple and EMI peaks |
| Wide-bandwidth error amplifier | 3MHz unity-gain bandwidth and 70dB DC gain support fast transient response and robust loop stability with standard type-II compensation |
| Robust protection suite | Includes cycle-by-cycle current limit, thermal shutdown (165°C), VCC UVLO (5.35V), and remote shutdown via SD pin |
Applications
| Industrial Power Supply | Telecom Line Card |
|---|---|
|
Use Scenario: Converting 48V telecom bus to 3.3V/5V for FPGA, DSP, or interface ICs in outdoor base stations. IC Role / Device Role / Timing Role: Primary buck controller managing high-efficiency, wide-input DC/DC conversion with EMI-controlled switching. Use Value: 50–500kHz frequency adjustability allows optimization for low-noise operation near sensitive RF sections while maintaining 3A capability. |
Use Scenario: Regulating 24V or 72V industrial fieldbus voltage to 12V for PLC I/O modules operating in temperature-varying enclosures. IC Role / Device Role / Timing Role: High-voltage step-down regulator with thermal shutdown and remote enable for ruggedized embedded systems. Use Value: 165°C thermal shutdown with 25°C hysteresis ensures reliable fault recovery in unventilated cabinets without derating. |
| Railway Signaling System | Energy Metering Hardware |
|
Use Scenario: Deriving 5V from 72V nominal railway traction battery for microcontroller and sensor subsystems subject to voltage transients. IC Role / Device Role / Timing Role: Input-transient-tolerant buck controller with 75V absolute max rating and cycle-by-cycle current limiting. Use Value: 76V absolute max VIN rating and internal VCC UVLO (5.35V) provide margin against line surges up to EN 50155 Level S2. |
Use Scenario: Powering metrology SoC and isolated communication interfaces from 24V building automation bus in smart electricity meters. IC Role / Device Role / Timing Role: Compact, thermally efficient DC/DC converter supporting long-life, maintenance-free deployment. Use Value: HTSSOP-20EP package with exposed pad achieves RθJB = 6.9°C/W, enabling 3A operation without heatsink in confined meter housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5575QMH/NOPB | Same family, 1.5A output rating; identical pinout and feature set except lower current capability and 100mΩ MOSFET | Suitable for lower-power industrial sensors or auxiliary rails where 3A is unnecessary | Select when output current demand is ≤1.5A and board space/layout reuse is prioritized |
| LM61460QWRNRRQ1 | Automotive-grade 60V/6A buck; uses true current-mode sensing, smaller 3mm × 3mm VQFN, no RAMP/IS pins | Designed for AEC-Q100 automotive applications with stricter qualification and different compensation methodology | Choose for automotive systems requiring PPAP documentation and higher current, but expect redesign of compensation and layout |
Compared with LM5575QMH/NOPB, the LM5576QMH/NOPB provides double the output current and higher MOSFET Rds(on) tolerance for same thermal footprint; versus LM61460QWRNRRQ1, it offers wider 75V input range and emulated ramp architecture better suited for ultra-low-duty-cycle industrial designs, albeit without automotive qualification.
Availability
LM5576QMH/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, railway signaling systems, telecom line cards, and energy metering hardware requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5576QMH/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 high-reliability power conversion solutions.
The LM5576QMH/NOPB belongs to TI's high-voltage buck regulator product line, engineered specifically for industrial and telecom applications demanding wide-input operation, robust protection, and simplified design with WEBENCH® integration.
FAQ
What is the maximum input voltage rating for LM5576QMH/NOPB?
The LM5576QMH/NOPB has an absolute maximum input voltage rating of 76V across VIN pins. Its recommended operating range is 6V to 75V, making it suitable for direct connection to industrial 24V, 48V, and 72V power buses. Exceeding 76V risks permanent damage, especially during transient events-careful input filtering and layout are essential.
Does LM5576QMH/NOPB require an external current-sense resistor?
No, the LM5576QMH/NOPB does not require an external current-sense resistor. It uses an internal 42mΩ sense element on the IS pin to sample re-circulating diode current, combined with an emulated ramp generator (RAMP pin) to reconstruct inductor current-eliminating noise-prone shunt resistors and enabling clean current-mode control.
How is switching frequency set on LM5576QMH/NOPB?
Switching frequency on the LM5576QMH/NOPB is set by a single resistor (RT) connected between the RT pin and AGND. The value is calculated using TI's Equation 1: RT = (1/F − 580 ns) / 135 ps. For example, 32.4kΩ yields ~200kHz. The RT resistor must be placed adjacent to the IC with short traces to minimize noise coupling.
Can LM5576QMH/NOPB synchronize to an external clock?
Yes, the LM5576QMH/NOPB supports external clock synchronization via its open-drain SYNC pin. An external clock with ≥15ns pulse width and frequency higher than the free-running oscillator can lock the internal timing. Multiple LM5576QMH/NOPB units can also self-synchronize by connecting their SYNC pins together, with the highest-frequency device acting as master.
What thermal management features does LM5576QMH/NOPB include?
The LM5576QMH/NOPB integrates thermal shutdown at 165°C with 25°C hysteresis and uses an HTSSOP-20EP package with exposed thermal pad (EP). When soldered to a PCB ground plane, it achieves RθJB = 6.9°C/W-enabling 3A operation without additional heatsinking in properly designed layouts. Thermal performance is further enhanced by the dual-mode VCC regulator reducing internal dissipation at high VIN.
LM5576QMH/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM5576QMH/NOPB FAQ
1.How can I place an order for LM5576QMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5576QMH/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 LM5576QMH/NOPB reliable?
The price and inventory of LM5576QMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5576QMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM5576QMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5576QMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5576QMH/NOPB?
LM5576QMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5576QMH/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 LM5576QMH/NOPB?
For technical support, including LM5576QMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5576QMH/NOPB requirements.
6.How does Aetrix verify that LM5576QMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5576QMH/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 LM5576QMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM5576QMH/NOPB?
All LM5576QMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5576QMH/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 LM5576QMH/NOPB part is unused and in its original packaging.
Return procedure for LM5576QMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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