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Texas Instruments LM5575QMH/NOPB
- Part No.:
- LM5575QMH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5575QMH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:499
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Product details
Overview
LM5575QMH/NOPB from Texas Instruments is an AEC-Q100 Grade 1 automotive buck switching regulator integrating a 75V, 330mΩ N-channel MOSFET, delivering 1.5A continuous output current with input voltage range 6V–75V, 1.225V adjustable output, and ±1.65% feedback reference accuracy. It enables robust power conversion in high-voltage automotive subsystems such as infotainment power rails and ADAS camera modules.
For engineers reviewing the LM5575QMH/NOPB datasheet, LM5575QMH/NOPB pinout, LM5575QMH/NOPB application, or LM5575QMH/NOPB equivalent, key selection criteria include its emulated current-mode control architecture, programmable 50–500kHz switching frequency, cycle-by-cycle current limit, thermal shutdown at 165°C, and HTSSOP-16 exposed-pad thermal performance.
Technical Context
The LM5575QMH/NOPB implements emulated current-mode control using a reconstructed ramp signal-generated via internal voltage-controlled current source (IRAMP = (10 µA × (VIN – VOUT)) + 50 µA) and external RAMP capacitor-to eliminate noise sensitivity and enable stable operation at very low duty cycles. Its dual-mode VCC regulator tracks VIN ≤9V and regulates to 7V for VIN >9V, supporting wide-input operation without external bias supply.
Functional integration includes synchronous oscillator capability (via SYNC pin), adjustable soft-start (10 µA current source into SS pin), remote shutdown with three-state SD pin (shutdown/standby/operational thresholds at 0.7V/1.225V), and diode-current-based sample-and-hold for accurate DC current sensing. Protection features are cycle-by-cycle current limiting (2.1A typ), thermal shutdown (165°C), and VCC UVLO (5.35V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 75V - supports direct connection to automotive battery and 48V bus without pre-regulation |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in vehicle ECUs |
| Feedback Reference | 1.225V ±1.65% - enables precise output regulation down to 1.225V with minimal external resistor tolerance impact |
| Switching Frequency | 50kHz to 500kHz (resistor-programmable) - allows trade-off between inductor size, efficiency, and EMI filtering requirements |
| MOSFET RDS(on) | 330mΩ max - limits conduction loss at 1.5A, enabling >90% efficiency in typical 12V→3.3V designs |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up |
| Operating Junction Temp | –40°C to +150°C - meets AEC-Q100 Grade 1 requirement for under-hood automotive environments |
Pinout & Package
The LM5575QMH/NOPB is housed in a 16-pin HTSSOP (PWP) package with 5mm × 4.4mm footprint and exposed thermal pad (EP) for enhanced heat dissipation. The exposed pad must be soldered to PCB ground plane per TI layout guidelines to achieve RθJC(bot) = 1.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 6–75V unregulated input; powers internal high-voltage start-up regulator and buck switch |
| VCC | Bias regulator output | Provides 7V regulated supply for control circuitry; can accept external 7.5–14V auxiliary supply to reduce IC dissipation |
| SW | Switching node | Drives external Schottky diode and buck inductor; connects to internal 75V/330mΩ N-MOSFET drain |
| BST | Bootstrap capacitor input | Connects to SW via 0.022µF ceramic capacitor to generate gate drive voltage for internal high-side switch |
| FB | Feedback input | Connects to resistor divider from output; internal 1.225V reference sets output voltage (VOUT = 1.225V × (1 + R1/R2)) |
| COMP | Error amplifier output | Interface for type-II compensation network (R/C between COMP and FB) to stabilize loop response |
| RT | Oscillator frequency set | Single resistor to AGND programs switching frequency from 50kHz to 500kHz per TI Equation 1 |
| SS | Soft-start control | 10µA internal current source charges external capacitor to ramp up reference voltage and limit inrush current |
| SD | Shutdown/standby control | Three-state logic: <0.7V = shutdown, 0.7–1.225V = standby (VCC active, switch off), >1.225V = full operation |
| IS | Diode current sense | Connects to Schottky diode anode; internal 83mΩ sense resistor enables accurate DC current reconstruction |
| RAMP | Emulated current ramp | External capacitor to AGND sets slope of reconstructed ramp; eliminates leading-edge spikes and blanking delays |
| SYNC | Oscillator sync I/O | Open-drain capable; synchronizes multiple LM5575QMH/NOPB devices or accepts external clock ≥550kHz |
| PGND | Power ground | Low-side return for IS sense resistor and buck switch; separate from AGND to minimize noise coupling |
| AGND | Analog ground | Reference for FB, COMP, RT, RAMP, and error amplifier; must be connected to PGND at single point near device |
| PRE | Pre-charge assist | Open-drain output tied to SW to boost BST capacitor charge during light-load or pre-charged output conditions |
| EP | Exposed thermal pad | Must be soldered to solid copper ground plane; primary thermal path for junction-to-board conduction (RθJB = 15.6°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode control | Eliminates need for current-sense resistor and associated noise filtering; enables stable regulation at <5% duty cycle in 48V→3.3V applications |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ESD ≥±2000V - suitable for engine control, body electronics, and ADAS modules |
| Integrated 75V/330mΩ MOSFET | Reduces BOM count by eliminating external high-voltage switch; supports direct 75V transients without external clamping |
| Programmable soft-start | Adjustable rise time via external SS capacitor prevents inrush current damage to input capacitors and downstream loads |
| Thermal and fault protection | Combines cycle-by-cycle current limit (2.1A), thermal shutdown (165°C), VCC UVLO (5.35V), and remote shutdown - ensures fail-safe behavior in harsh environments |
| WEBENCH® Power Designer support | Enables complete schematic generation, efficiency simulation, thermal analysis, and bill-of-materials export directly from TI's online tool |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Powering 3.3V/1.8V rails for SoC, display driver, and audio codec in head-unit systems subject to load-dump transients. IC Role / Device Role / Timing Role: Primary buck regulator converting 9–16V battery to stable low-voltage outputs with fast transient response. Use Value: 75V input rating withstands ISO 7637-2 Pulse 5a (120V/50ms); emulated current mode delivers <10µs load-step recovery for video frame stability. |
Use Scenario: Generating 5V and 3.3V supplies for CMOS image sensor, ISP, and serial interface in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from 12V vehicle bus with low-noise output for analog sensor circuits. Use Value: ±1.65% reference accuracy ensures consistent sensor biasing; HTSSOP thermal pad maintains <85°C junction temp in sealed camera housing. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
|
Use Scenario: Providing 5V supply to microcontroller, CAN transceiver, and relay drivers in door module or lighting control unit. IC Role / Device Role / Timing Role: Robust DC/DC converter handling cold-crank (4.5V) and load-dump (60V) conditions per ISO 16750-2. Use Value: Dual-mode VCC regulator sustains operation down to 6V input; SD pin enables coordinated system-level power sequencing with MCU GPIO. |
Use Scenario: Delivering 12V auxiliary rail for motor gate drivers and position sensor interfaces in EPS ECU with stringent ASIL-B compliance. IC Role / Device Role / Timing Role: Safety-relevant power stage with built-in current limiting and thermal shutdown to prevent runaway faults. Use Value: Cycle-by-cycle current limit (2.1A) and 165°C thermal shutdown provide hardware-level fault containment independent of software monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5576QMH/NOPB | Higher 3A output current, same 75V input, identical pinout and feature set | Required where peak load exceeds 1.5A (e.g., multi-rail BCMs with solenoid drivers) | Select when higher output current is needed without redesigning layout or compensation |
| TPS54362-Q1 | 65V max input, 3.5A output, integrated FET, but uses traditional current-sense resistor instead of emulated ramp | Suitable for cost-sensitive 12V/24V systems where 75V rating is unnecessary and layout space permits external sense resistor | Choose for higher current and lower RDS(on) (110mΩ) where 65V input suffices and EMI filtering overhead is acceptable |
Compared with LM5575QMH/NOPB, LM5576QMH/NOPB offers 100% pin-compatible current upgrade, while TPS54362-Q1 trades 10V input headroom for higher current and conventional sensing-requiring different compensation and layout due to sense-resistor placement and noise sensitivity.
Availability
LM5575QMH/NOPB is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM5575QMH/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-grade product development and AEC-Q100 validation expertise.
The LM5575-Q1 product line delivers high-voltage buck regulators optimized for automotive power systems demanding reliability under extreme voltage transients, wide temperature operation, and functional safety readiness.
FAQ
What is the maximum input voltage rating for the LM5575QMH/NOPB?
The LM5575QMH/NOPB has an absolute maximum input voltage rating of 76V on the VIN pin, with recommended operating range from 6V to 75V. This rating enables direct connection to 48V and 60V automotive buses and survival through ISO 7637-2 load-dump transients up to 120V when used with appropriate input clamping. Exceeding 76V risks permanent damage to the internal 75V MOSFET and bias circuitry.
Does the LM5575QMH/NOPB require an external current-sense resistor?
No, the LM5575QMH/NOPB does not require an external current-sense resistor. It uses an internal 83mΩ sense element on the IS pin combined with a sample-and-hold circuit to reconstruct the diode current, and an emulated ramp generator referenced to VIN and VOUT. This eliminates external sensing components, reduces board area, and avoids noise pickup issues associated with shunt resistors.
How is the switching frequency programmed on the LM5575QMH/NOPB?
The switching frequency of the LM5575QMH/NOPB is programmed using a single resistor connected between the RT pin and AGND. The value is calculated using TI's Equation 1: RT = (1/(135×10⁻¹² × F)) − (580×10⁻⁹), where F is the desired frequency in Hz. For example, a 32.4kΩ resistor sets F ≈ 200kHz. The resistor must be placed close to the IC with short traces to minimize noise coupling.
What thermal performance can be expected from the LM5575QMH/NOPB in a standard 2-layer PCB?
In a standard 2-layer PCB with 1oz copper and the exposed thermal pad (EP) fully soldered to a 250mm² ground plane, the LM5575QMH/NOPB achieves RθJB = 15.6°C/W. At 1.5A output and 12V input, typical power dissipation is ~0.8W, resulting in ~12.5°C junction-to-board temperature rise above ambient-well within the +125°C max junction limit even at +85°C ambient.
Can multiple LM5575QMH/NOPB devices be synchronized to a common clock?
Yes, multiple LM5575QMH/NOPB devices can be synchronized using the SYNC pin. Connecting SYNC pins together allows automatic master-slave synchronization, where the device with the highest programmed frequency becomes the master. Alternatively, an external clock ≥550kHz can be applied via open-drain interface. Synchronization reduces beat frequencies and simplifies EMI filter design in multi-rail automotive systems.
LM5575QMH/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM5575QMH/NOPB FAQ
1.How can I place an order for LM5575QMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5575QMH/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 LM5575QMH/NOPB reliable?
The price and inventory of LM5575QMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5575QMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM5575QMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5575QMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5575QMH/NOPB?
LM5575QMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5575QMH/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 LM5575QMH/NOPB?
For technical support, including LM5575QMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5575QMH/NOPB requirements.
6.How does Aetrix verify that LM5575QMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5575QMH/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 LM5575QMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM5575QMH/NOPB?
All LM5575QMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5575QMH/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 LM5575QMH/NOPB part is unused and in its original packaging.
Return procedure for LM5575QMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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