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Texas Instruments LM5575MH/NOPB
- Part No.:
- LM5575MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5575MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,283
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Product details
Overview
LM5575MH/NOPB from Texas Instruments is a 75V input, 1.5A synchronous step-down DC/DC switching regulator with integrated 330mΩ N-channel MOSFET, emulated current-mode control, and adjustable 50–500kHz switching frequency. It delivers stable output down to 1.225V and supports automotive-grade operation (−40°C to +125°C) in HTSSOP-16EP package.
For engineers reviewing the LM5575MH/NOPB datasheet, LM5575MH/NOPB pinout, LM5575MH/NOPB application, or LM5575MH/NOPB equivalent, key selection criteria include its 75V max input rating, cycle-by-cycle current limiting at 2.1A typ, thermal shutdown at 165°C, soft-start programmability via external capacitor, and SYNC capability for multi-regulator synchronization.
Technical Context
The LM5575MH/NOPB implements emulated current-mode control using a reconstructed ramp signal derived from VIN–VOUT and a diode-current sample-and-hold DC level - eliminating leading-edge spikes and enabling reliable sub-100ns minimum on-time. Its dual-mode VCC regulator maintains ~7V bias above 9V VIN while tracking VIN below that threshold, supporting 6–75V operation without external bias supply.
It integrates a 75V, 330mΩ N-channel buck switch, pre-charge assist (PRE), bootstrap gate drive (BST/SW), and precision 1.225V feedback reference with 1.5% accuracy. Protection includes cycle-by-cycle current limit, thermal shutdown (165°C), remote shutdown (SD pin thresholds at 0.7V/1.225V), and forced 500ns off-time for IS sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 75V - enables direct connection to 24V/48V/72V industrial and automotive bus rails without pre-regulation. |
| Output Current | 1.5A continuous - sufficient for powering FPGAs, microcontrollers, and analog subsystems in harsh environments. |
| Feedback Reference | 1.225V ±1.5% - sets precise output voltage with external resistor divider; low drift supports stable regulation over temperature. |
| Switching Frequency | 50kHz to 500kHz - adjustable via single RT resistor; higher frequencies reduce inductor size but increase switching loss. |
| Current Limit Threshold | 2.1A typical - provides cycle-by-cycle protection against short-circuit and overload without external sensing components. |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Soft-Start Current | 10µA ±30% - controls ramp rate of external SS capacitor to limit inrush current during power-up. |
Pinout & Package
LM5575MH/NOPB is housed in a thermally enhanced HTSSOP-16EP package with exposed die attach pad (EP) for PCB ground connection, enabling efficient heat dissipation in high-power-density designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 6–75V unregulated input; absolute max 76V - requires local ceramic bypassing and transient suppression. |
| VCC | Bias regulator output | Internally regulated to ~7V above 9V VIN; supplies internal logic and gate driver - needs 0.1–1µF ceramic decoupling. |
| SW | Switching node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode - high dv/dt node requiring tight layout. |
| BST | Bootstrap capacitor connection | Connects to SW via 0.022µF ceramic capacitor to generate floating gate drive voltage for high-side switch. |
| FB | Feedback input | Inverting input of error amplifier; referenced to 1.225V - sets output voltage via resistive divider from OUT. |
| COMP | Error amplifier output | Provides access to compensation network (type II) between COMP and FB for loop stability tuning. |
| RT | Oscillator frequency set | Single resistor to AGND programs switching frequency from 50kHz to 500kHz - critical for EMI and efficiency trade-offs. |
| SS | Soft-start control | 10µA current source charges external capacitor to ramp reference voltage - prevents output overshoot and inrush stress. |
| SD | Shutdown/standby enable | Three-state logic: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active - supports undervoltage lockout via external divider. |
| SYNC | Frequency synchronization | Open-drain input/output - allows master-slave sync of multiple LM5575 devices or external clock injection for EMI reduction. |
| RAMP | Emulated current ramp | External capacitor sets slope; internal current source scales with (VIN–VOUT) - enables accurate current-mode control without noise-prone sense resistor. |
| IS | Diode current sense | Measures re-circulating Schottky diode current for DC level reconstruction - eliminates need for high-side current sense. |
| PRE | Pre-charge assist | Open-drain output tied to SW to boost BST capacitor charge under light-load or pre-biased conditions - prevents gate drive dropout. |
| AGND | Analog ground reference | Low-noise ground for internal references, error amp, and RAMP generator - must be separated from PGND in layout. |
| PGND | Power ground return | High-current return path for buck switch and IS sense resistor - connects to power plane under EP pad. |
Key Features
| Feature | Design Value |
|---|---|
| 75V Integrated N-Channel MOSFET | Eliminates external high-voltage switch and associated gate drive complexity for 48V/72V bus conversion. |
| Emulated Current-Mode Control | Reconstructs inductor current without noisy high-side sensing - enables stable operation at <10% duty cycle in high-VIN/low-VOUT applications. |
| Adjustable 50–500kHz Frequency | Single RT resistor sets frequency - allows optimization of magnetic size vs. efficiency vs. EMI compliance across diverse input/output conditions. |
| 1.225V ±1.5% Feedback Reference | Enables accurate output regulation across −40°C to +125°C - critical for automotive and industrial systems requiring tight voltage tolerance. |
| Thermal Shutdown with Hysteresis | 165°C trip with 25°C hysteresis ensures safe recovery after overheating - avoids thermal cycling damage during intermittent overload. |
| SYNC Pin for Multi-Regulator Coordination | Enables deterministic phase alignment of multiple LM5575 units - reduces input ripple and simplifies EMI filter design in multi-rail systems. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers DSP, display controller, and audio codec in head-unit systems supplied from 12V/24V battery with load dump transients up to 60V. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.3V/1.2V rails with fast transient response to handle burst-mode processing loads. Use Value: 75V input rating withstands ISO 7637-2 pulse 5a/b; 1.5A output supports multi-rail sequencing; SYNC enables coordinated switching with other regulators to minimize conducted EMI. | Use Scenario: Generates isolated 5V and 3.3V supplies for digital I/O and communication interfaces in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Main DC/DC converter stepping down 24V or 48V field bus to logic-level voltages with high reliability under wide ambient temperature swings. Use Value: −40°C to +125°C operating range ensures uptime in uncooled enclosures; HTSSOP-16EP package enables compact board area; soft-start prevents brownout during cold start. |
| Telecom Remote Radio Unit | Heavy-Duty Motor Drive Auxiliary Supply |
Use Scenario: Provides 5V bias for RF front-end ICs and FPGA configuration in outdoor base station radios powered from −48V telecom bus. IC Role / Device Role / Timing Role: High-input-voltage buck converter converting −48V (absolute 48V) to positive 5V with reverse-polarity protection implemented externally. Use Value: 6–75V input range accommodates −48V nominal with margin for ripple and surges; emulated current mode ensures stability despite long trace inductance in distributed power architectures. | Use Scenario: Supplies gate drivers, sensors, and MCU in variable-frequency drives where main DC bus operates at 300–600V and auxiliary rail is derived from tapped bus or dedicated winding. IC Role / Device Role / Timing Role: Secondary buck regulator fed from intermediate 24V or 48V auxiliary bus to deliver clean 15V/5V for isolated gate drive and control logic. Use Value: Robust current limiting (2.1A) protects against shorted gate driver outputs; thermal shutdown prevents latch-up during motor stall conditions; PRE pin ensures reliable startup even with pre-charged output caps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5576MH/NOPB | Same family, 3A output rating; larger 75V MOSFET with 150mΩ Rds(on); identical pinout and feature set. | Higher current delivery required; same PCB footprint usable with updated inductor/capacitor ratings. | Select when >1.5A continuous load or lower conduction loss is needed; no layout change required. |
| LM5164HPRR | 4.5–100V input, 0.6A output; smaller 10-pin WSON package; integrated high-side MOSFET only (asynchronous); no PRE/IS pins. | Lower power, space-constrained applications; lacks diode current sensing and pre-charge assist. | Choose for cost-sensitive, low-current designs where 75V+ input and minimal BOM count outweigh need for 1.5A+ output. |
Compared with LM5575MH/NOPB, LM5576MH/NOPB offers higher current capacity in identical packaging, while LM5164HPRR trades output current and advanced sensing for smaller size and wider input range - making LM5575MH/NOPB optimal for 1–1.5A industrial/automotive buck conversion where thermal performance and robust current monitoring are essential.
Availability
LM5575MH/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and telecom remote radio units requiring stable component supply across extended temperature ranges and high-reliability operation.
Supply support for LM5575MH/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 automotive and industrial qualification expertise.
The LM5575MH/NOPB belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for rugged, easy-to-use DC/DC conversion in harsh environments where input voltage can exceed 60V and reliability under thermal stress is non-negotiable.
FAQ
What is the maximum input voltage rating for LM5575MH/NOPB?
The LM5575MH/NOPB has an absolute maximum input voltage rating of 76V, with recommended continuous operation from 6V to 75V. Exceeding 76V risks permanent damage due to internal junction breakdown. In practice, system-level transient protection (e.g., TVS diodes) is advised for automotive or industrial applications where load dump or inductive kick can push VIN beyond nominal rails. The LM5575MH/NOPB itself does not include integrated overvoltage clamping.
Does LM5575MH/NOPB require an external Schottky diode?
Yes, the LM5575MH/NOPB requires an external Schottky diode connected between SW and PGND to provide the freewheeling path during the buck switch off-time. The device does not integrate a synchronous rectifier; instead, it uses the IS pin to sense diode current for emulated current-mode control. A CMSH3-100 or equivalent 100V/3A Schottky diode is commonly used. Layout must minimize loop area between SW, diode, and PGND to reduce EMI and voltage ringing.
How is the switching frequency set on LM5575MH/NOPB?
The switching frequency of LM5575MH/NOPB is set by a single resistor (RT) connected between the RT pin and AGND. Using the formula FSW ≈ 1 / (135 pF × RT), a 32.4kΩ resistor yields ~200kHz. Frequency ranges from 50kHz (RT = 148kΩ) to 500kHz (RT = 11kΩ). The RT resistor must be placed close to the IC with short traces to minimize noise coupling; values outside the 11kΩ–148kΩ range may cause instability or out-of-spec operation.
Can LM5575MH/NOPB operate with an output voltage lower than 1.225V?
No, the LM5575MH/NOPB cannot regulate below its internal 1.225V feedback reference voltage. The FB pin compares the divided output voltage to this fixed reference, so the minimum achievable output is 1.225V × (1 + R1/R2), where R1 and R2 form the external divider. To achieve lower outputs, an external reference or post-regulator (e.g., LDO) is required. Attempting to force lower output via divider mismatch results in loss of regulation and potential overvoltage on downstream circuitry.
What thermal considerations apply to LM5575MH/NOPB in HTSSOP-16EP package?
The LM5575MH/NOPB in HTSSOP-16EP has θJA = 50°C/W and θJC = 14°C/W. Effective thermal design requires soldering the exposed pad (EP) to a minimum 200mm² copper pour connected to internal/external ground planes. Without proper pad thermal relief, junction temperature can exceed 125°C at full 1.5A load even at 25°C ambient. Thermal shutdown activates at 165°C, but sustained operation above 125°C accelerates parametric drift and reduces lifetime - derating is recommended above 85°C ambient.
LM5575MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-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:
- 1.5A
- Frequency - Switching:
- 50kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM5575MH/NOPB FAQ
1.How can I place an order for LM5575MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5575MH/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 LM5575MH/NOPB reliable?
The price and inventory of LM5575MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5575MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM5575MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5575MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5575MH/NOPB?
LM5575MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5575MH/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 LM5575MH/NOPB?
For technical support, including LM5575MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5575MH/NOPB requirements.
6.How does Aetrix verify that LM5575MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5575MH/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 LM5575MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM5575MH/NOPB?
All LM5575MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5575MH/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 LM5575MH/NOPB part is unused and in its original packaging.
Return procedure for LM5575MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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