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Texas Instruments LM25575QMH/NOPB
- Part No.:
- LM25575QMH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25575QMH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:276
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Product details
Overview
LM25575QMH/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 regulated output down to 1.225V with 1.5% feedback reference accuracy and supports industrial power supplies operating from 6V–42V input rails.
For engineers reviewing the LM25575QMH/NOPB datasheet, LM25575QMH/NOPB pinout, LM25575QMH/NOPB application, or LM25575QMH/NOPB equivalent, key selection criteria include input voltage range (6–42V), continuous output current (1.5A), thermal shutdown threshold (165°C), soft-start current source (10µA), and HTSSOP-16EP package compatibility with exposed-pad PCB thermal management.
Technical Context
The LM25575QMH/NOPB implements emulated current-mode control using an internal ramp generator and IS-pin diode-current sampling, enabling stable loop compensation and inherent line regulation without leading-edge spike filtering. Its dual-mode VCC regulator maintains 7V bias at VIN > 9V and tracks VIN below 9V, supporting wide-input operation while limiting internal dissipation.
Frequency is set via RT-to-AGND resistor (50–1000kHz range); SYNC pin enables multi-device synchronization or external clock locking. Protection includes cycle-by-cycle current limit (2.1A typ), thermal shutdown (165°C), and programmable UVLO via SD pin with 0.7V shutdown / 1.225V enable thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 42V - supports industrial bus voltages including 24V and 36V systems without pre-regulation |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in harsh environments |
| Feedback Reference | 1.225V ±1.5% - enables precise low-voltage outputs (e.g., 1.8V, 3.3V) with minimal external resistor tolerance impact |
| Switch RDS(on) | 330mΩ max - reduces conduction loss and thermal stress in high-current buck stages |
| Switching Frequency | 50kHz to 1MHz - allows trade-off between inductor size (higher f) and efficiency (lower f) |
| Thermal Shutdown | 165°C with 25°C hysteresis - prevents permanent damage during overload or poor heatsinking |
| Soft-Start Current | 10µA typical - sets controlled output ramp time with external SS capacitor, reducing inrush stress |
Pinout & Package
LM25575QMH/NOPB uses the HTSSOP-16EP (PWP) package: 5mm × 4.4mm body with 0.65mm pitch and exposed thermal pad (EP) on underside, requiring solder connection to PCB ground plane for optimal thermal performance (RθJC(bot) = 1.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply | Accepts 6–42V unregulated input; powers internal VCC regulator and switch driver |
| VCC | Bias regulator output | Provides 7V regulated supply for control circuitry; can accept external 7.5–14V auxiliary bias to reduce IC dissipation |
| SW | Switch node | Connects to inductor and Schottky diode anode; carries high dI/dt buck switching waveform |
| BST | Bootstrap capacitor input | Requires 0.022µF ceramic cap to SW; enables high-side N-MOSFET gate drive via charge pump |
| FB | Feedback input | Senses output voltage divider; internal 1.225V reference sets regulation point |
| COMP | Error amplifier output | Connects to FB via Type II compensation network; determines loop stability and transient response |
| RT | Oscillator frequency set | Resistor to AGND programs switching frequency from 50kHz to 1MHz |
| SYNC | Frequency sync I/O | Allows multi-device synchronization or external clock locking; sink impedance 110Ω, threshold 1.3V |
| SD | Shutdown control | 0.7V shutdown / 1.225V enable thresholds; internal 5µA pull-up enables default-on operation |
| SS | Soft-start control | 10µA current source charges external capacitor to ramp reference voltage and limit inrush |
| RAMP | Emulated current ramp | External capacitor sets slope; internal current source scales with (VIN – VOUT) for accurate duty-cycle control |
| IS | Diode current sense | Measures re-circulating Schottky diode current to reconstruct DC inductor current level |
| PGND | Power ground | Low-side return for switch and IS sense resistor; separate from AGND to minimize noise coupling |
| AGND | Analog ground | Reference for FB, COMP, RT, RAMP, and error amplifier; must be star-connected to PGND at single point |
| PRE | Pre-charge assist | Open-drain output tied to SW to boost bootstrap capacitor charge under light-load or pre-biased conditions |
| EP | Exposed thermal pad | Must be soldered to PCB ground plane; primary thermal path (RθJC(bot) = 1.5°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode control | Eliminates leading-edge current-sense spikes and propagation delays, enabling stable operation at very low duty cycles (e.g., 12V→3.3V) |
| Integrated 42V/330mΩ N-MOSFET | Reduces BOM count and layout complexity while maintaining 1.5A output capability without external switch |
| Adjustable soft-start (10µA source) | Enables precise control of output voltage ramp rate via external SS capacitor, preventing input rail sag and downstream reset issues |
| Multi-device synchronization (SYNC pin) | Supports phase-aligned operation of multiple LM25575QMH/NOPB regulators to reduce input ripple and EMI peak amplitude |
| Dual-mode VCC regulator | Tracks VIN below 9V and regulates to 7V above 9V - extends usable input range while minimizing internal power loss |
| Robust protection suite | Includes cycle-by-cycle current limit (2.1A typ), thermal shutdown (165°C), and UVLO on VCC and SD pins for system-level fault resilience |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Provides 5V/1.5A and 3.3V/1A rails from 24V vehicle battery or factory 24V/48V DC bus with load dump transients up to 42V. IC Role / Device Role / Timing Role: Primary buck regulator delivering isolated, regulated DC power to MCU, CAN transceivers, and analog front-ends. Use Value: Wide 6–42V input range withstands cold-crank (6.5V) and load-dump (42V) events; 1.5A output supports multiple subsystems without parallel regulators. | Use Scenario: Powers infotainment head-unit logic and display backlight drivers from 12V automotive battery with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency step-down converter with synchronized switching to meet CISPR-25 Class 5 conducted emissions requirements. Use Value: SYNC pin enables fixed-frequency operation locked to system clock, suppressing EMI peaks; HTSSOP-16EP package aids thermal management in confined enclosures. |
| Telecom Remote Radio Unit | Factory Automation Sensor Hub |
Use Scenario: Generates 3.3V/1.2A for FPGA, ADCs, and RF front-end from -48V telecom rectified bus via intermediate 12V stage. IC Role / Device Role / Timing Role: Secondary buck regulator in distributed power architecture, optimized for high line regulation and fast load transient response. Use Value: Emulated current-mode control provides inherent line feed-forward and tight load regulation (<1% deviation at 1.5A step); RAMP pin allows slope compensation tuning for stability across temperature. | Use Scenario: Supplies 1.8V/1A and 5V/0.8A to industrial IoT edge nodes with vibration, dust, and wide ambient temperature (-40°C to +85°C). IC Role / Device Role / Timing Role: Main power converter with thermal shutdown and remote enable (SD pin) for safe firmware-controlled power sequencing. Use Value: 165°C thermal shutdown with 25°C hysteresis prevents latch-up during overheating; SD pin supports brown-out detection and graceful shutdown via external resistor divider. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QHJKRQ1 | 42V, 1A, 1.5MHz max fSW, integrated high-side MOSFET only (requires external low-side diode/FET) | Higher switching frequency enables smaller magnetics but lower output current; lacks IS pin for diode-current sensing | Choose for space-constrained designs needing >1MHz operation; avoid if 1.5A continuous output or emulated current-mode stability is required |
| TPS54340QDDARQ1 | 42V, 3.5A, current-mode control with direct inductor current sensing (no emulation), 100kHz–2.5MHz fSW | Higher current rating and true current sensing improve transient response but increase sensitivity to layout noise and require careful compensation | Choose when >1.5A output or faster load-step response is critical; avoid if design must minimize EMI susceptibility or simplify compensation |
Compared with LM5164QHJKRQ1 and TPS54340QDDARQ1, the LM25575QMH/NOPB offers balanced 1.5A output, proven emulated current-mode stability across wide duty cycles, and integrated diode-current sensing-making it optimal for robust industrial and automotive power supplies where reliability trumps peak frequency or current headroom.
Availability
LM25575QMH/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, telecom remote radio units, and factory automation sensor hubs requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM25575QMH/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 LM25575 product line delivers easy-to-use, high-voltage buck regulators targeting industrial, automotive, and telecom applications where wide input range, integrated FETs, and robust protection are essential.
FAQ
What is the maximum continuous output current of the LM25575QMH/NOPB?
The LM25575QMH/NOPB delivers 1.5A of continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). This rating assumes use of the HTSSOP-16EP package with exposed pad soldered to a minimum 1-in² copper area on inner or outer PCB layer. Derating applies above 85°C ambient due to thermal limits.
Does the LM25575QMH/NOPB require an external Schottky diode?
Yes, the LM25575QMH/NOPB requires an external Schottky diode connected between the SW and OUT pins. The IC integrates only the high-side N-channel MOSFET; the diode provides the low-side conduction path during the switch off-time. Diode selection must consider reverse voltage rating (>42V), forward voltage drop (<0.5V), and thermal performance under 1.5A peak current.
How is the switching frequency set on the LM25575QMH/NOPB?
The switching frequency of the LM25575QMH/NOPB is set by a single resistor (RT) connected between the RT pin and AGND. Using Equation 1 from the datasheet (RT = 1/(135×10⁻¹² × F) − 580×10⁻⁹), a 32.4kΩ resistor yields ~200kHz. Frequency range is 50kHz to 1MHz; values outside this range cause unstable operation or excessive jitter.
What is the purpose of the IS pin on the LM25575QMH/NOPB?
The IS pin on the LM25575QMH/NOPB senses current through the external Schottky diode's anode to reconstruct the DC level of inductor current. This sampled-and-held value combines with the emulated ramp (from RAMP pin) to form the total current signal used in emulated current-mode control-enabling accurate duty-cycle calculation without direct high-side switch current measurement.
Can the LM25575QMH/NOPB operate with an input voltage below 6V?
No, the LM25575QMH/NOPB has a specified minimum input voltage of 6V per Recommended Operating Conditions. Below 6V, the internal VCC regulator cannot sustain bias for control circuitry, and startup may fail. The absolute minimum VIN is 6V; operation at 5.9V is not guaranteed and risks undervoltage lockout or erratic behavior.
LM25575QMH/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):
- 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
LM25575QMH/NOPB FAQ
1.How can I place an order for LM25575QMH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25575QMH/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 LM25575QMH/NOPB reliable?
The price and inventory of LM25575QMH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25575QMH/NOPB is usually 5 days.
3.What payment methods are accepted for LM25575QMH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25575QMH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25575QMH/NOPB?
LM25575QMH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25575QMH/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 LM25575QMH/NOPB?
For technical support, including LM25575QMH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25575QMH/NOPB requirements.
6.How does Aetrix verify that LM25575QMH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25575QMH/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 LM25575QMH/NOPB meets industry standards.
7.What is the process for return or replacement of LM25575QMH/NOPB?
All LM25575QMH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25575QMH/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 LM25575QMH/NOPB part is unused and in its original packaging.
Return procedure for LM25575QMH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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