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Texas Instruments LM25005MH/NOPB
- Part No.:
- LM25005MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25005MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:816
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Product details
Overview
LM25005MH/NOPB from Texas Instruments is a 42V, 2.5A synchronous step-down DC/DC switching regulator with integrated 160mΩ N-channel MOSFET, current-mode control using emulated ramp, and programmable 50–500kHz oscillator. It delivers regulated output down to 1.225V and operates across 7–42V input for industrial point-of-load conversion.
For engineers reviewing the LM25005MH/NOPB datasheet, LM25005MH/NOPB pinout, LM25005MH/NOPB application, or LM25005MH/NOPB equivalent, key selection criteria include input voltage range (7–42V), output current capability (2.5A), thermal performance in HTSSOP-20 with exposed pad, soft-start programmability, and SYNC-capable multi-regulator synchronization.
Technical Context
The LM25005MH/NOPB implements peak current-mode control via an emulated inductor current ramp-generated by internal voltage-controlled current source and external RAMP capacitor-eliminating noise-sensitive current sensing and enabling stable operation at very small duty cycles. Its dual-mode VCC bias regulator tracks VIN up to 9V then regulates to 7V, supporting wide-input operation without external LDO.
Functional integration includes cycle-by-cycle current limiting (1.75V threshold), thermal shutdown at 165°C, programmable soft-start via SS pin (10µA current source), and bidirectional SYNC pin enabling master-slave synchronization of multiple regulators. The IS pin enables diode-current sampling for accurate DC-level reconstruction of inductor current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 42V - supports direct connection to industrial 24V/36V/42V bus rails without pre-regulation. |
| Output Current | 2.5A continuous - sufficient for mid-power point-of-load applications such as FPGA core supplies or telecom interface rails. |
| Feedback Reference | 1.225V ±1.5% - enables precise output regulation with minimal external resistor tolerance impact. |
| Switch RDS(on) | 170–340mΩ - low conduction loss at full load; optimized for efficiency in 12–24VIN/3.3–5VOUT configurations. |
| Oscillator Frequency | 50–500kHz - set by single RT resistor; allows layout-optimized trade-off between size (higher f) and efficiency (lower f). |
| Thermal Resistance θJA | 35.2°C/W - achievable with 2-layer PCB and proper thermal pad soldering; enables 2.5A operation at TA ≤ 85°C. |
| Soft-Start Current | 7–14µA - controls ramp rate of error amplifier reference; determines startup time with external SS capacitor. |
Pinout & Package
LM25005MH/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package measuring 6.5mm × 4.4mm with exposed die attach pad (EP) for PCB ground connection to improve heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (3,4) | Power input | Main high-voltage supply input (7–42V); connects to bulk capacitor and must be decoupled near pins. |
| SW (17,18) | Switch node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode; high dv/dt node requiring tight layout. |
| PGND (13,14) | Power ground | Low-side return for switch and IS sense resistor; separate from AGND to minimize noise coupling. |
| AGND (10) | Analog ground | Reference for FB, COMP, RAMP, and internal error amplifier; must be connected to quiet ground plane. |
| FB (7) | Feedback input | Inverting input of error amplifier; senses output via resistive divider; 1.225V reference sets VOUT = 1.225V × (1 + R1/R2). |
| COMP (6) | Error amp output | Connects to FB through type-II compensation network; loop stability depends on RC values here. |
| SS (11) | Soft-start control | Capacitor-connected node; internal 10µA current source ramps reference voltage to limit inrush current. |
| RT (8) | Oscillator set | Resistor-to-AGND sets switching frequency; value selected per f = 1/(RT × 135pF + 580ns). |
| SYNC (5) | Oscillator sync I/O | Bidirectional pin; accepts external clock or synchronizes multiple LM25005s; requires open-drain driver for external sync. |
| SD (2) | Shutdown/stby input | Three-state logic: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active; internal 5µA pull-up if floating. |
| BST (20) | Bootstrap supply | Connects to SW via 22nF ceramic capacitor; powers high-side gate driver during MOSFET on-time. |
| PRE (19) | Precharge assist | Open-drain output tied to SW; aids BST capacitor charging under light load or precharged output conditions. |
| RAMP (9) | Emulated ramp input | External capacitor to AGND sets slope; current source scales with (VIN − VOUT), enabling duty-cycle robustness. |
| IS (15,16) | Diode current sense | Connects to Schottky diode anode; samples freewheeling current to reconstruct DC inductor current level. |
| OUT (12) | Regulated output | High-current output node; connects directly to output capacitor and load; routed with low-inductance path. |
| VCC (1) | Bias regulator output | Internal LDO output (7V regulated above 9V VIN); powers control circuitry; requires 0.1–1µF ceramic decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Emulated current-mode control | Eliminates current-sense noise and propagation delay, enabling stable regulation at <10% duty cycle in 42V→3.3V conversion. |
| Integrated 42V/160mΩ N-MOSFET | Reduces BOM count and layout area; eliminates external high-voltage switch selection and gate drive design. |
| Programmable soft-start (SS pin) | 10µA current source enables precise control of output voltage ramp rate and inrush current limiting via external capacitor. |
| Synchronization capability (SYNC pin) | Allows deterministic phase alignment of multiple LM25005MH/NOPB regulators to reduce input ripple and EMI peaks. |
| Dual-mode VCC bias regulator | Tracks VIN below 9V and regulates to 7V above 9V-enabling seamless operation across wide input range without auxiliary supply. |
Applications
| Industrial Point-of-Load Regulation | Telecom Power Distribution |
|---|---|
|
Use Scenario: Converting 24V or 48V backplane voltage to 3.3V/5V for PLC I/O modules or motor drive logic. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, efficient, and thermally robust local power. Use Value: 2.5A output and 42V rating support direct connection to factory automation bus rails; HTSSOP thermal pad sustains full load at 85°C ambient. |
Use Scenario: Generating intermediate 12V rail from -48V telecom rectified bus for Ethernet PHY and management controllers. IC Role / Device Role / Timing Role: High-input-voltage step-down controller with UVLO and remote shutdown for system-level power sequencing. Use Value: 7–42V input range accommodates rectified -48V bus transients; SD pin enables centralized power-down during fault events. |
| Factory Automation Power | High-Voltage Embedded Systems |
|
Use Scenario: Supplying 5V to microcontroller, sensors, and CAN transceivers in industrial gateways operating from 24V DC supply. IC Role / Device Role / Timing Role: Main DC/DC converter delivering clean, regulated power with low EMI due to SYNC-capable fixed-frequency operation. Use Value: Programmable 50–500kHz frequency avoids sensitive bands; RAMP capacitor tuning suppresses sub-harmonic oscillation at high duty cycles. |
Use Scenario: Powering FPGA core voltage (1.0V–1.2V) from 12V or 24V board supply in test equipment or medical imaging subsystems. IC Role / Device Role / Timing Role: High-efficiency, high-PoL regulator with precision 1.225V reference and wide bandwidth error amplifier for fast transient response. Use Value: 1.5% feedback accuracy and 3MHz unity-gain bandwidth enable tight regulation under dynamic FPGA load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 42V input, 1A output, integrated FET, but uses constant-on-time (COT) control instead of emulated current mode. | Lower output current; better transient response in COT mode but less predictable frequency under line/load variation. | Select when 1A output suffices and deterministic frequency is not required; automotive-grade (AEC-Q100) variant available. |
| TPS54240DGQR | 42V input, 2.5A output, current-mode control, but no emulated ramp-uses direct high-side current sense with blanking. | Higher noise sensitivity at light load; requires careful layout to avoid false triggering; lacks SYNC pin. | Select when cost is prioritized over EMI robustness and multi-phase synchronization; smaller 10-pin MSOP package. |
Compared with LM5164QPWPRQ1 and TPS54240DGQR, the LM25005MH/NOPB uniquely combines 2.5A output, emulated current-mode control for noise immunity, and SYNC capability-making it optimal for industrial systems requiring stable frequency, high reliability, and coordinated multi-rail power delivery.
Availability
LM25005MH/NOPB is available at Aetrix Electronics and suitable for industrial point-of-load regulation, telecom infrastructure power distribution, and factory automation control systems requiring stable component supply across extended product lifecycles.
Supply support for LM25005MH/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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LM25005MH/NOPB belongs to TI's high-voltage buck regulator product line, engineered specifically for robust, high-efficiency DC/DC conversion in industrial, telecom, and transportation applications where wide input range and thermal resilience are critical.
FAQ
What is the maximum input voltage rating for the LM25005MH/NOPB?
The LM25005MH/NOPB has an absolute maximum input voltage rating of 45V, with recommended operating range from 7V to 42V. Exceeding 45V-even transiently-can cause permanent damage. Layout best practices include placing high-quality input capacitors close to VIN and PGND pins to suppress ringing during load transients.
How does the emulated current ramp in the LM25005MH/NOPB improve performance over traditional current sensing?
The LM25005MH/NOPB replaces noisy, delay-prone high-side current sensing with an emulated ramp generated from VIN−VOUT and a sampled diode current level. This eliminates leading-edge spikes and blanking delays, enabling reliable operation at very small duty cycles (e.g., 42V→3.3V) and reducing EMI susceptibility in noisy industrial environments.
Can the LM25005MH/NOPB synchronize with external clock sources?
Yes-the LM25005MH/NOPB features a bidirectional SYNC pin that accepts external clock signals (with >15ns pulse width) or enables self-synchronization among multiple devices. When multiple LM25005MH/NOPB units are connected, the highest-frequency unit acts as master, ensuring deterministic phase alignment and reduced input ripple in multi-rail systems.
What thermal performance can be expected from the LM25005MH/NOPB in a standard 2-layer PCB layout?
With proper thermal pad soldering to a 2-layer PCB (≥2 in² copper pour connected to EP), the LM25005MH/NOPB achieves θJA ≈ 35.2°C/W. At 2.5A output and 24V input, typical power dissipation is ~1.8W, resulting in ~63°C junction rise above ambient-well within the 125°C max operating temperature when ambient stays ≤ 62°C.
Is an external bootstrap capacitor required for the LM25005MH/NOPB, and what value is recommended?
Yes-an external ceramic capacitor between BST and SW is mandatory for high-side gate drive. Texas Instruments recommends a 22nF X7R or C0G capacitor placed adjacent to the BST and SW pins. This capacitor charges during SW low-time via the internal bootstrap diode and ensures sufficient gate voltage for the integrated N-MOSFET across the full duty cycle range.
LM25005MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-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):
- 7V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 50kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM25005MH/NOPB FAQ
1.How can I place an order for LM25005MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25005MH/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 LM25005MH/NOPB reliable?
The price and inventory of LM25005MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25005MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM25005MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25005MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25005MH/NOPB?
LM25005MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25005MH/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 LM25005MH/NOPB?
For technical support, including LM25005MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25005MH/NOPB requirements.
6.How does Aetrix verify that LM25005MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM25005MH/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 LM25005MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM25005MH/NOPB?
All LM25005MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM25005MH/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 LM25005MH/NOPB part is unused and in its original packaging.
Return procedure for LM25005MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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