My Inquiry
My Account
Texas Instruments LM5576Q0MHX/NOPB
- Part No.:
- LM5576Q0MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5576Q0MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,415
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM5576Q0MHX/NOPB from Texas Instruments is a 75V-input, 3A synchronous buck controller IC with integrated 170mΩ N-channel MOSFET, emulated current-mode control, and adjustable 50–500kHz switching frequency. It delivers regulated DC output as low as 1.225V and supports industrial power bus applications requiring high-voltage step-down with robust thermal and fault protection.
For engineers reviewing the LM5576Q0MHX/NOPB datasheet, LM5576Q0MHX/NOPB pinout, LM5576Q0MHX/NOPB application, or LM5576Q0MHX/NOPB equivalent, key selection criteria include input voltage range (6–75V), soft-start programmability, SYNC capability for multi-regulator coherence, BST/PRE bootstrap assist, and HTSSOP-20EP thermal performance.
Technical Context
The LM5576Q0MHX/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 operation at very low duty cycles. Its dual-mode VCC regulator maintains 7V bias across 6–75V VIN, with automatic LDO-to-HV switch at ~9V.
Functional modes include three-level SD pin control (shutdown/standby/active), cycle-by-cycle current limiting via IS-sense path, thermal shutdown at 165°C with 25°C hysteresis, and oscillator synchronization via open-drain SYNC pin supporting master-slave multi-device coordination without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 75 V - supports wide industrial bus rails including 24V, 48V, and 72V systems without pre-regulation. |
| Output Current | 3 A continuous - enables single-chip 36W+ conversion at 12V out from 48V input with proper layout and heatsinking. |
| Feedback Reference | 1.225 V ±1.5% - sets precise output regulation threshold; used directly with resistor divider for adjustable VOUT. |
| Switching Frequency | 50 kHz to 500 kHz - set by single RT resistor; allows trade-off between inductor size (lower f) and efficiency/noise (higher f). |
| Integrated MOSFET Rds(on) | 170 mΩ (typ) - reduces conduction loss and simplifies BOM vs. external-FET controllers; rated for 75V drain-source. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects die during overload or poor PCB thermal design; auto-recovery after cooldown. |
| Soft-Start Current | 10 µA (typ) - charges external SS capacitor linearly; controls inrush and output voltage ramp rate during startup. |
Pinout & Package
LM5576Q0MHX/NOPB uses the HTSSOP-20EP (PWP) package: 6.5 mm × 4.4 mm body with 0.65 mm pitch, featuring an exposed thermal pad (EP) soldered to PCB ground plane for enhanced heat dissipation (RθJB = 6.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (pins 3,4) | Main power input | Accepts 6–75V unregulated supply; powers internal HV start-up regulator and gate driver. |
| BST (pin 20) | Bootstrap supply input | Connects to SW via 0.022µF ceramic capacitor; provides gate drive voltage >VIN for high-side switch. |
| SW (pins 17,18) | Switch node | Drain of internal N-MOSFET; connects to inductor and external Schottky diode cathode. |
| PGND (pins 13,14) | Power ground return | Low-side reference for IS sense resistor and PRE switch; must be separate from AGND in layout. |
| IS (pins 15,16) | Diode current sense | Measures re-circulating diode anode current to reconstruct DC level of inductor current for emulated ramp. |
| FB (pin 7) | Feedback input | Connects to resistor divider from VOUT; compares against 1.225V reference to regulate output voltage. |
| COMP (pin 6) | Error amplifier output | Provides loop compensation node; requires external Type II network (R/C) between COMP and FB for stability. |
| RT (pin 8) | Oscillator frequency set | Resistor to AGND sets switching frequency; value calculated per TI Equation 1 for target fSW. |
| SYNC (pin 5) | Oscillator sync I/O | Open-drain pin enabling multi-device synchronization or external clock injection (min pulse width 15 ns). |
| SS (pin 11) | Soft-start control | 10µA current source charges external capacitor; clamped during fault conditions (thermal/VCC UVLO/SD). |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode architecture | Eliminates need for current-sense resistor and RC filter; enables stable regulation at <10% duty cycle in high-VIN/low-VOUT applications. |
| Pre-charge assist (PRE pin) | 265 ns open-drain pulse per cycle aids BST capacitor charging under light load or pre-biased output conditions. |
| Three-level shutdown control | SD pin thresholds (0.7V shutdown / 1.225V active) enable programmable undervoltage lockout and remote enable/disable sequencing. |
| Wide-bandwidth error amplifier | 3 MHz unity-gain bandwidth and 70 dB DC gain support fast transient response and flexible compensation network design. |
| Exposed thermal pad (EP) | Direct metal connection to PCB ground plane reduces junction-to-board thermal resistance to 6.9°C/W, critical for 3A continuous operation. |
Applications
| Industrial Power Supply | Telecom Line Card |
|---|---|
Use Scenario: Step-down 48V or 72V telecom bus to 3.3V/5V/12V for FPGA, DSP, or interface ICs on line cards. IC Role / Device Role / Timing Role: Primary buck controller managing high-efficiency, isolated or non-isolated point-of-load conversion with tight load regulation. Use Value: 75V rating avoids need for front-end pre-regulators; SYNC pin enables coherent switching across multiple rails to reduce EMI peaks. | Use Scenario: Distributed power architecture in base station cabinets where 24V/48V backplane feeds multiple board-level regulators. IC Role / Device Role / Timing Role: High-voltage buck controller delivering 3A at 5V for RF transceiver modules and clock distribution circuits. Use Value: Integrated 170mΩ MOSFET and emulated current mode ensure stable operation under rapid load transients typical of burst-mode RF transmission. |
| Railway Signaling System | Factory Automation Controller |
Use Scenario: Converting 72V nominal railway battery (77V max) to 15V for PLC I/O modules and sensor interfaces in harsh environments. IC Role / Device Role / Timing Role: Robust primary DC-DC converter with thermal shutdown, cycle-by-cycle current limit, and wide input tolerance for EN 50155 compliance. Use Value: 165°C thermal shutdown and 75V absolute max rating provide margin against voltage surges on rolling stock power lines. | Use Scenario: Powering motion control boards in CNC machines where 24V/48V factory bus supplies servo drivers and microcontrollers. IC Role / Device Role / Timing Role: High-current buck controller supplying 3A at 5V/3.3V to real-time processors and isolated communication interfaces (RS-485, CAN). Use Value: Adjustable soft-start prevents inrush into large downstream capacitors; HTSSOP-20EP package supports compact, thermally managed layouts on dense control boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164Q0MHX/NOPB | 4.5–65V input, 1A output, integrated FET, smaller HTSSOP-16 package; lacks IS pin and PRE function. | Suitable for lower-power industrial sensors or auxiliary rails; not rated for 72V bus or 3A loads. | Select when input ≤65V and output current ≤1A; offers lower quiescent current but reduced voltage/current headroom. |
| LM5145Q0MHX/NOPB | 4.5–65V input, 5A output, external FET drive, no integrated MOSFET; includes VSENSE for accurate current monitoring. | Used in higher-power motor drives or redundant power systems where external FETs improve thermal scalability. | Select when >3A output or discrete FET optimization is required; trades integration for flexibility and higher current capability. |
Compared with LM5576Q0MHX/NOPB, LM5164Q0MHX/NOPB offers lower system cost and footprint for sub-1A designs but sacrifices 75V tolerance and 3A capacity, while LM5145Q0MHX/NOPB provides greater current headroom and external FET control at the expense of added components and layout complexity.
Availability
LM5576Q0MHX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, railway signaling systems, and factory automation controllers requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5576Q0MHX/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 decades of expertise in high-reliability power conversion ICs.
The LM5576 product line delivers easy-to-use, high-voltage buck controllers for industrial, telecom, and transportation applications where wide input range, integrated power stage, and robust protection are essential.
FAQ
What is the maximum input voltage rating for LM5576Q0MHX/NOPB?
The LM5576Q0MHX/NOPB has an absolute maximum input voltage rating of 76 V across VIN pins, with recommended operating range from 6 V to 75 V. Exceeding 76 V-even transiently-risks permanent damage. Layout best practices include placing high-quality input bypass capacitors close to VIN and PGND pins to suppress ringing during line transients.
How does the emulated current-mode control in LM5576Q0MHX/NOPB differ from traditional peak current-mode control?
The LM5576Q0MHX/NOPB reconstructs the inductor current ramp using a sample-and-hold DC level (from IS pin diode current) and an emulated slope (via RAMP pin capacitor and voltage-controlled current source), avoiding direct switch-node sensing. This eliminates leading-edge spikes and propagation delays, enabling stable regulation at very low duty cycles (<10%) without blanking circuits-critical for high-VIN/low-VOUT applications.
Can LM5576Q0MHX/NOPB synchronize multiple converters, and how is it implemented?
Yes, LM5576Q0MHX/NOPB supports multi-device synchronization via its open-drain SYNC pin. Connecting SYNC pins of multiple LM5576Q0MHX/NOPB units causes the highest-frequency device to act as master, pulling the shared line low and resetting others' oscillator ramps. No external components are needed beyond pull-up resistors if driving from external clock; minimum pulse width is 15 ns.
What thermal management considerations apply to LM5576Q0MHX/NOPB in 3A continuous operation?
For 3A continuous output, LM5576Q0MHX/NOPB requires the exposed pad (EP) to be soldered to a minimum 250 mm² copper area tied to internal/external ground planes. With proper 2-layer PCB layout and 1 oz copper, junction-to-board thermal resistance is 6.9°C/W. At full load and 75°C ambient, junction temperature remains below 125°C if RθJA ≤ 40°C/W is maintained via adequate copper and airflow.
Is LM5576Q0MHX/NOPB qualified for automotive applications?
No, LM5576Q0MHX/NOPB is not AEC-Q100 qualified. It is specified for industrial temperature range (−40°C to +125°C) and intended for industrial, telecom, and railway applications. For automotive use, TI recommends the pin-compatible LM5576MQ0MHX/NOPB (Q1 grade) or LM5164Q0MHX/NOPB with appropriate qualification documentation.
LM5576Q0MHX/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
LM5576Q0MHX/NOPB FAQ
1.How can I place an order for LM5576Q0MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5576Q0MHX/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 LM5576Q0MHX/NOPB reliable?
The price and inventory of LM5576Q0MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5576Q0MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5576Q0MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5576Q0MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5576Q0MHX/NOPB?
LM5576Q0MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5576Q0MHX/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 LM5576Q0MHX/NOPB?
For technical support, including LM5576Q0MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5576Q0MHX/NOPB requirements.
6.How does Aetrix verify that LM5576Q0MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5576Q0MHX/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 LM5576Q0MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5576Q0MHX/NOPB?
All LM5576Q0MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5576Q0MHX/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 LM5576Q0MHX/NOPB part is unused and in its original packaging.
Return procedure for LM5576Q0MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5576Q0MHX/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
