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Texas Instruments LM25575Q0MHX/NOPB
- Part No.:
- LM25575Q0MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25575Q0MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,711
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Product details
Overview
LM25575Q0MHX/NOPB from Texas Instruments is a 42V, 1.5A synchronous step-down DC/DC switching regulator with integrated 330mΩ N-channel MOSFET, emulated current-mode control, and adjustable 50kHz–1MHz switching frequency. It delivers stable output down to 1.225V with 1.5% feedback reference accuracy and supports industrial power rails (e.g., 24V/36V bus conversion to 3.3V/5V for PLC I/O modules).
For engineers reviewing the LM25575Q0MHX/NOPB datasheet, LM25575Q0MHX/NOPB pinout, LM25575Q0MHX/NOPB application, or LM25575Q0MHX/NOPB equivalent, key selection criteria include input voltage range (6–42V), thermal performance in HTSSOP-16EP, cycle-by-cycle current limiting (2.1A typ), soft-start programmability, and SYNC capability for multi-regulator EMI reduction.
Technical Context
The LM25575Q0MHX/NOPB implements emulated current-mode control using a reconstructed ramp signal derived from VIN–VOUT and a diode-current sample-and-hold circuit - eliminating leading-edge spikes and enabling reliable sub-100ns minimum on-time operation. Its dual-mode VCC regulator maintains 7V bias at VIN > 9V while tracking VIN below 9V, supporting wide-input startup without external LDO.
Functional integration includes BST/SW bootstrap gate drive with pre-charge assist (PRE), IS-pin diode current sensing, RAMP-pin slope compensation tuning, and RT-pin resistor-programmable oscillator. Protection features are cycle-by-cycle current limit (2.1A), thermal shutdown (165°C), and UVLO on VCC (5.35V) and SD (0.7V/1.225V thresholds).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 42V - supports direct connection to industrial 24V/36V buses and automotive 12V/24V systems with transient margin. |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, FPGAs, and analog front-ends in embedded controllers. |
| Feedback Reference | 1.225V ±1.5% - enables precise output regulation down to 1.225V with minimal external resistor tolerance impact. |
| Switching Frequency | 50kHz to 1MHz (RT-programmable) - allows trade-off between inductor size (higher fSW → smaller L) and efficiency (lower fSW → lower switching loss). |
| Integrated MOSFET RDS(on) | 330mΩ (typ) - reduces conduction loss and eliminates need for external high-voltage switch in compact designs. |
| Thermal Resistance θJA | 38.4°C/W - requires exposed-pad PCB thermal vias to sustain full load at 125°C ambient without derating. |
| Soft-Start Current | 10µA (typ) - sets rise time of output voltage via external SS capacitor; discharges automatically during fault recovery. |
Pinout & Package
LM25575Q0MHX/NOPB uses the HTSSOP-16EP (PWP) package: 5mm × 4.4mm body with 0.65mm pitch and exposed thermal pad (EP) soldered to PCB ground plane for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Main power input (6–42V); connects to bulk capacitor and feeds internal VCC regulator and buck switch. |
| VCC | Bias supply output | 7V regulated output (for VIN > 9V) or VIN-tracked (for VIN < 9V); powers internal logic and gate driver; requires 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 supply | Connects to SW via 0.022µF ceramic capacitor; supplies floating gate drive voltage for high-side MOSFET. |
| FB | Feedback input | Inverting input of error amplifier; referenced to 1.225V; sets output voltage via resistive divider from VOUT. |
| COMP | Error amplifier output | Connects to FB via type-II compensation network (R/C) to stabilize loop response and reject line/load transients. |
| RT | Oscillator set | Resistor-to-AGND sets switching frequency (50kHz–1MHz); value calculated per TI Equation 1. |
| RAMP | Emulated current ramp | External capacitor-to-AGND sets ramp slope; current source scales with (VIN–VOUT) for accurate duty-cycle control. |
| SS | Soft-start control | 10µA current source charges external capacitor to ramp reference voltage; discharged during thermal/VCC/SD faults. |
| SD | Shutdown input | Three-state enable: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active; internal 5µA pull-up if left open. |
| SYNC | Frequency sync I/O | Allows multiple LM25575Q0MHX/NOPB units to synchronize to highest-frequency device or external clock (>550kHz). |
| IS | Diode current sense | Connects to Schottky diode anode; internal 83mΩ sense resistor + sample/hold provides DC level for emulated ramp. |
| OUT | Regulated output | High-current output node; connects directly to output capacitor and load; low-impedance path critical for stability. |
| PGND | Power ground | Return path for switch current and IS sense resistor; separate from AGND to avoid noise coupling into control loop. |
| AGND | Analog ground | Reference for FB, COMP, RT, RAMP, SS; must be star-connected to PGND at single point near IC for noise immunity. |
| PRE | Pre-charge assist | Open-drain output tied to SW; activates 250ns before each on-time to recharge BST capacitor under light-load/precharged conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode architecture | Eliminates current-sense spike filtering and blanking delays, enabling stable operation at <10% duty cycle (e.g., 42V→3.3V). |
| Integrated 42V/330mΩ N-MOSFET | Reduces BOM count by 1 active component and PCB area vs. controller-only solutions; supports 1.5A continuous without external heatsink. |
| Adjustable soft-start (SS pin) | Prevents inrush current and output overshoot during power-up; external capacitor value directly controls ramp time (e.g., 100nF ≈ 10ms). |
| SYNC pin for multi-device synchronization | Enables deterministic interleaving or common-frequency operation across multiple rails, reducing peak input current and conducted EMI. |
| Robust protection suite | Includes cycle-by-cycle current limit (2.1A), thermal shutdown (165°C), VCC UVLO (5.35V), and remote shutdown (SD pin) - no external protection needed. |
Applications
| Industrial Motor Drives | Programmable Logic Controllers (PLCs) |
|---|---|
|
Use Scenario: Powering isolated I/O modules, fieldbus interfaces (RS-485/CAN), and microcontroller cores from 24V DC bus. IC Role / Device Role / Timing Role: Primary 24V-to-5V/3.3V buck converter supplying logic and interface circuitry with high PSRR and fast load transient response. Use Value: 1.5A output sustains burst currents during digital I/O switching; HTSSOP-16EP package meets IPC-2221 creepage requirements for 24V industrial environments. |
Use Scenario: Generating auxiliary 12V/5V rails for analog sensor conditioning, relay drivers, and communication peripherals in modular PLC backplanes. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter operating from 36V or 48V distributed supply with SYNC-enabled parallel operation. Use Value: Adjustable frequency avoids noise-sensitive bands (e.g., 400kHz avoids AM radio band); 42V rating accommodates 36V nominal bus with 20% transients. |
| Automotive Body Control Modules (BCMs) | Telecom Remote Radio Units (RRUs) |
|
Use Scenario: Converting 12V battery rail to 5V/3.3V for MCU, CAN transceivers, and LED drivers in BCMs with cold-crank (6V) and load-dump (42V) resilience. IC Role / Device Role / Timing Role: Input-tolerant buck regulator providing stable output during cranking and alternator transients without external TVS or LDO. Use Value: 6–42V input range covers full automotive specification; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Use Scenario: Stepping down -48V telecom supply to +5V/+3.3V for FPGA configuration, ADC/DAC bias, and RF front-end control logic in outdoor RRUs. IC Role / Device Role / Timing Role: High-voltage buck regulator with SYNC capability to align switching edges across multiple power domains and reduce EMI in dense RF layouts. Use Value: Emulated current mode ensures stable regulation at 48V→3.3V (7% duty cycle); exposed pad enables forced-air cooling in fanless RRU housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25574Q0MHX/NOPB | Same pinout and feature set but rated for 45V max input and 1.25A output; slightly lower RDS(on) (300mΩ). | Lower output current limits use in higher-power industrial sensors or dual-rail systems where 1.5A headroom is unnecessary. | Select when 45V absolute max rating and tighter thermal margin are prioritized over 1.5A capability. |
| LM5164Q0MHX/NOPB | 42V input, 1A output, 1.5MHz max frequency, and integrated high-side MOSFET only (requires external low-side diode/FET). | Higher switching frequency enables smaller magnetics but lacks integrated low-side switch; requires additional components for synchronous rectification. | Choose for ultra-compact designs where board space outweighs BOM simplicity and efficiency at light loads. |
Compared with LM25575Q0MHX/NOPB, LM25574Q0MHX/NOPB trades 0.25A output current for marginally improved voltage rating and RDS(on), while LM5164Q0MHX/NOPB sacrifices integration and full-load efficiency for higher fSW and smaller passive size - making LM25575Q0MHX/NOPB optimal for balanced industrial power delivery.
Availability
LM25575Q0MHX/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers, automotive body control modules, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM25575Q0MHX/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 ICs.
The LM25575Q0MHX/NOPB belongs to TI's high-voltage buck regulator product line, engineered for robust industrial and automotive power supply design where wide input range, integrated FETs, and comprehensive protection are mandatory.
FAQ
What is the maximum junction temperature and thermal shutdown behavior of the LM25575Q0MHX/NOPB?
The LM25575Q0MHX/NOPB features thermal shutdown triggered at 165°C (typical), forcing the device into a low-power reset state that disables both the output switch and VCC regulator. Recovery occurs automatically once junction temperature falls below the hysteresis threshold (140°C). This protects against catastrophic failure during sustained overload or inadequate heatsinking. The HTSSOP-16EP package's 1.5°C/W θJC(bot) requires solid thermal vias under the exposed pad for reliable 1.5A operation at 125°C ambient.
How does the LM25575Q0MHX/NOPB achieve stable operation at very low duty cycles, such as 42V-to-3.3V conversion?
The LM25575Q0MHX/NOPB uses emulated current-mode control - reconstructing the inductor current ramp instead of measuring the noisy SW node - which eliminates blanking delays and leading-edge spikes. This enables clean PWM timing even at <10% duty cycle. Combined with a 500ns forced off-time and RAMP-pin slope compensation scaling with (VIN–VOUT), the LM25575Q0MHX/NOPB maintains stability and transient response without external filtering or complex compensation.
Can the LM25575Q0MHX/NOPB be synchronized to an external clock, and what are the electrical requirements?
Yes, the LM25575Q0MHX/NOPB SYNC pin supports external clock synchronization with a falling-edge threshold of 1.3V, sink impedance of 110Ω, and minimum pulse width of 15ns. An open-drain clock source is recommended. The external clock must exceed the free-running frequency set by the RT resistor (e.g., >485kHz for RT=11kΩ). Multiple LM25575Q0MHX/NOPB devices can be daisy-chained on one SYNC net, with the highest-frequency unit acting as master.
What is the role of the IS pin, and how must it be connected in a typical LM25575Q0MHX/NOPB application?
The IS pin on the LM25575Q0MHX/NOPB senses re-circulating diode current to generate the DC level of the emulated current ramp. It must be connected directly to the anode of the external Schottky diode (e.g., CMSH3-60), with the cathode tied to OUT and the diode's anode also routed to PGND through the internal 83mΩ sense resistor. Incorrect routing - such as connecting IS to SW or omitting the diode - disrupts current reconstruction and causes instability or overcurrent trips.
Does the LM25575Q0MHX/NOPB require an external bootstrap capacitor, and what is its recommended value?
Yes, the LM25575Q0MHX/NOPB requires a 0.022µF ceramic capacitor between BST and SW pins to supply gate drive voltage for the internal N-MOSFET. This capacitor must be placed with minimal trace length (<2mm) and use X7R/X5R dielectric for stable capacitance across temperature. Under light-load or precharged-output conditions, the PRE pin assists charging; however, the BST capacitor remains essential for all normal operation - omission causes immediate gate drive failure and switch dropout.
LM25575Q0MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 50kHz ~ 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM25575Q0MHX/NOPB FAQ
1.How can I place an order for LM25575Q0MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25575Q0MHX/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 LM25575Q0MHX/NOPB reliable?
The price and inventory of LM25575Q0MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25575Q0MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM25575Q0MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25575Q0MHX/NOPB transactions.
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4.How is shipping managed for LM25575Q0MHX/NOPB?
LM25575Q0MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25575Q0MHX/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 LM25575Q0MHX/NOPB?
For technical support, including LM25575Q0MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25575Q0MHX/NOPB requirements.
6.How does Aetrix verify that LM25575Q0MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25575Q0MHX/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 LM25575Q0MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM25575Q0MHX/NOPB?
All LM25575Q0MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25575Q0MHX/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 LM25575Q0MHX/NOPB part is unused and in its original packaging.
Return procedure for LM25575Q0MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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