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Texas Instruments LM25575MH/NOPB
- Part No.:
- LM25575MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25575MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,997
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Product details
Overview
LM25575MH/NOPB from Texas Instruments is a 42V, 1.5A synchronous step-down DC/DC switching regulator with integrated 330mΩ N-channel MOSFET, adjustable 1.225V output voltage, 1.5% feedback reference accuracy, and emulated current-mode control architecture. It operates from 6V to 42V input and delivers robust power conversion in industrial bus supplies and telecom front-ends.
For engineers reviewing the LM25575MH/NOPB datasheet, LM25575MH/NOPB pinout, LM25575MH/NOPB application, or LM25575MH/NOPB equivalent, key selection criteria include its wide 6–42V input range, programmable 50kHz–1MHz switching frequency, cycle-by-cycle current limiting, thermal shutdown, and HTSSOP-16EP package with exposed thermal pad for high-power-density designs.
Technical Context
The LM25575MH/NOPB implements emulated current-mode control using an internal ramp generator and IS-pin diode-current sampling, eliminating leading-edge spikes and enabling stable operation at low duty cycles. Its dual-mode VCC regulator tracks VIN up to 9V then regulates to 7V, supporting full 6–42V operation while minimizing internal dissipation.
Frequency is set via a single RT-to-AGND resistor (50kHz–1MHz), and synchronization is supported through the open-drain SYNC pin for multi-regulator coherence. Protection includes cycle-by-cycle current limit (2.1A typ), thermal shutdown at 165°C, remote shutdown via SD pin with 0.7V/1.225V thresholds, and soft-start controlled by external capacitor on SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 42V - supports unregulated industrial and automotive bus rails without pre-regulation |
| Output Current | 1.5A continuous - sufficient for powering FPGAs, DSPs, and analog subsystems from high-voltage sources |
| Feedback Reference | 1.225V ±1.5% - enables precise output regulation down to 1.225V with external resistor divider |
| Switch RDS(on) | 330mΩ (typ) - reduces conduction loss and improves efficiency at 1.5A load |
| Switching Frequency | 50kHz to 1MHz - adjustable via RT resistor to balance size (inductor/capacitor) vs. efficiency vs. EMI |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor heatsinking in enclosed systems |
| Soft-Start Current | 10µA (typ) - sets rise time of output voltage via external SS capacitor, limiting inrush into downstream capacitance |
Pinout & Package
LM25575MH/NOPB is housed in a thermally enhanced HTSSOP-16EP (PWP) package measuring 5mm × 4.4mm with an exposed die attach pad for direct PCB thermal coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary input supply connection (6–42V); feeds internal VCC regulator and buck switch |
| VCC | Bias Supply Output | Regulated 7V output (≤9V VIN) or tracked VIN (<9V); powers internal circuitry and bootstrap driver |
| SW | Switch Node | Drain of internal N-MOSFET; connects to inductor and external Schottky diode anode |
| BST | Bootstrap Supply | Connects to SW via 0.022µF ceramic capacitor; supplies 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 |
| COMP | Error Amplifier Output | Provides access to EA output for external Type II compensation network between COMP and FB |
| RT | Oscillator Set | Resistor-to-AGND sets switching frequency (50kHz–1MHz); requires short trace placement |
| SYNC | Frequency Sync I/O | Open-drain pin for synchronizing multiple LM25575MH/NOPB units or locking to external clock |
| SD | Shutdown Control | Three-state enable: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active; includes 5µA pull-up |
| SS | Soft-Start | 10µA current source charges external capacitor to ramp reference voltage and control startup slew rate |
| IS | Diode Current Sense | Connects to Schottky diode anode; samples recirculating current for DC level of emulated ramp |
| RAMP | Emulated Ramp Output | Drives external capacitor to generate slope-compensated current ramp; value depends on VIN–VOUT |
| AGND | Analog Ground | Reference for FB, COMP, RT, RAMP, SS; must be separated from PGND for noise immunity |
| PGND | Power Ground | Return path for buck switch, IS sense resistor, and output capacitor; ties to exposed pad |
| OUT | Output Connection | Direct connection point to regulated output voltage node and output filter capacitor |
| PRE | Pre-Charge Assist | Open-drain output tied to SW to aid BST capacitor charging during light-load or pre-biased start-up |
Key Features
| Feature | Design Value |
|---|---|
| Emulated Current-Mode Control | Eliminates current-sense spike filtering and blanking delays, enabling stable regulation at very low duty cycles (e.g., 12V→3.3V @ 1MHz) |
| Integrated 42V/330mΩ N-MOSFET | Reduces BOM count and layout area; eliminates need for external high-voltage switch and associated gate drive |
| Programmable Switching Frequency | Single RT resistor allows optimization across efficiency, EMI, and passive component size without changing IC |
| Multi-Device Synchronization | SYNC pin enables deterministic phase alignment of multiple LM25575MH/NOPB regulators to reduce input ripple and simplify EMI filtering |
| Robust Fault Protection | Cycle-by-cycle current limit, thermal shutdown, and UVLO on VCC and SD ensure safe operation under overload, short-circuit, and brownout conditions |
Applications
| Industrial PLC Power Supply | Telecom Line Card Bias |
|---|---|
Use Scenario: Powers FPGA, microcontroller, and I/O drivers in programmable logic controllers operating from 24V or 48V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering 3.3V/1.5A or 5V/1.5A with tight line/load regulation. Use Value: Wide 6–42V input accommodates bus transients; emulated current mode ensures fast transient response to varying I/O loads. | Use Scenario: Generates intermediate 5V or 12V rails from -48V telecom battery backup systems using isolated DC/DC + post-regulation. IC Role / Device Role / Timing Role: Post-regulator providing clean, low-noise bias for SERDES, PHYs, and clock buffers. Use Value: 1.5% reference accuracy and wide bandwidth error amplifier maintain stable output under dynamic packet traffic loads. |
| Automotive Body Control Module | Test Equipment Auxiliary Rail |
Use Scenario: Supplies 5V/1.5A to MCU and CAN transceivers in 12V/24V vehicle body electronics with cold-crank tolerance. IC Role / Device Role / Timing Role: High-input buck regulator handling 6V–42V transients including load dump and cranking dips. Use Value: Built-in 42V rating and thermal shutdown protect against sustained overvoltage; SD pin enables system-level sleep/wake sequencing. | Use Scenario: Provides user-configurable auxiliary voltage (e.g., 3.3V, 5V, 12V) in automated test equipment requiring rapid reconfiguration. IC Role / Device Role / Timing Role: Flexible, field-programmable power stage where RT and feedback resistors define operating point. Use Value: Adjustable frequency and soft-start allow tuning for minimal inrush and optimal noise performance across diverse DUT loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25574MH/NOPB | Same family, 42V input but 0.5A output current; smaller thermal footprint | Suitable only for lower-power loads; not drop-in for 1.5A requirements | Select when output current ≤0.5A and board space is constrained |
| LM5164HPRR | 42V, 1A buck with integrated high-side MOSFET; 1.5MHz max frequency; different pinout and compensation scheme | Lacks IS pin and emulated ramp; uses traditional current sensing; higher switching frequency enables smaller passives | Choose for compact designs prioritizing 1.5MHz operation and simpler current sensing, accepting 1A limit |
Compared with LM25574MH/NOPB and LM5164HPRR, the LM25575MH/NOPB uniquely delivers 1.5A output with emulated current-mode control and full 6–42V operation in HTSSOP-16EP-making it optimal for industrial and telecom applications demanding both current capability and transient robustness without external current-sense components.
Availability
LM25575MH/NOPB is available at Aetrix Electronics and suitable for industrial PLC power supplies, telecom line card biasing, and automotive body control modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LM25575MH/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 was designed specifically for high-input-voltage industrial and telecom applications requiring integrated, easy-to-use buck regulators with robust protection and thermal performance in compact packages.
FAQ
What is the maximum output current capability of the LM25575MH/NOPB?
The LM25575MH/NOPB delivers 1.5A of continuous output current under typical thermal conditions with adequate PCB copper and airflow. Its integrated 330mΩ N-channel MOSFET and HTSSOP-16EP package with exposed pad enable this rating. Peak current limit is specified at 2.1A (typ), but sustained operation above 1.5A requires careful thermal design per the RθJA = 38.4°C/W specification.
How does the LM25575MH/NOPB achieve stable operation at low duty cycles?
The LM25575MH/NOPB uses emulated current-mode control, reconstructing the inductor current ramp instead of measuring the noisy switch-node current directly. This eliminates leading-edge spikes and propagation delays, allowing reliable PWM at very small duty cycles-critical for high-input/low-output conversions like 42V→3.3V. The RAMP pin drives an external capacitor to generate the slope-compensated signal.
Can the LM25575MH/NOPB be synchronized to an external clock?
Yes, the LM25575MH/NOPB supports external synchronization via its open-drain SYNC pin. An external clock with frequency higher than the free-running oscillator (set by RT) can be applied, and multiple LM25575MH/NOPB devices can be synchronized together by connecting their SYNC pins. The highest-frequency device becomes the master, ensuring deterministic phase alignment and reduced input ripple.
What is the purpose of the IS pin on the LM25575MH/NOPB?
The IS pin on the LM25575MH/NOPB connects to the anode of the external Schottky freewheeling diode and senses recirculating diode current. An internal sense resistor and sample-and-hold circuit capture this current near the end of the off-time, providing the DC level for the emulated current ramp-enabling accurate current-mode control without a separate sense resistor or complex filtering.
Does the LM25575MH/NOPB require an external bootstrap capacitor?
Yes, the LM25575MH/NOPB requires a 0.022µF ceramic capacitor connected between the BST and SW pins. This bootstrap capacitor supplies gate drive voltage for the internal high-side N-MOSFET during its on-time. The PRE pin provides optional pre-charge assist during light-load or pre-biased conditions to ensure reliable BST capacitor charging across all operating modes.
LM25575MH/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM25575MH/NOPB FAQ
1.How can I place an order for LM25575MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25575MH/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 LM25575MH/NOPB reliable?
The price and inventory of LM25575MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25575MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM25575MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25575MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25575MH/NOPB?
LM25575MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25575MH/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 LM25575MH/NOPB?
For technical support, including LM25575MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25575MH/NOPB requirements.
6.How does Aetrix verify that LM25575MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25575MH/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 LM25575MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM25575MH/NOPB?
All LM25575MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25575MH/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 LM25575MH/NOPB part is unused and in its original packaging.
Return procedure for LM25575MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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