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Texas Instruments LM25005MH
- Part No.:
- LM25005MH
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM25005MH.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,165
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Product details
Overview
LM25005MH from Texas Instruments is a 42V, 2.5A synchronous step-down DC/DC switching regulator with integrated 42V/160mΩ N-channel MOSFET, current-mode control using emulated ramp, and programmable 50–500kHz oscillator. It delivers precise 1.225V feedback reference (±1.5%) and supports industrial point-of-load conversion from 7V–42V input to low-voltage rails.
For engineers reviewing the LM25005MH datasheet, LM25005MH pinout, LM25005MH application, or LM25005MH equivalent, key selection considerations include its HTSSOP-20 exposed-pad thermal package, dual-level shutdown/standby control via SD pin, RAMP-based slope compensation for high-VIN duty cycles, and synchronization capability across multiple regulators.
Technical Context
The LM25005MH implements peak current-mode control using an emulated inductor current ramp-generated by internal voltage-controlled current source and external RAMP capacitor-to eliminate noise-sensitive current sensing and enable stable operation at very small duty cycles (e.g., 10VOUT/42VIN). Its error amplifier features 70dB DC gain and 3MHz unity-gain bandwidth, optimized for type-II compensation networks connected between COMP and FB pins.
Thermal management relies on the exposed die attach pad (EP) soldered to PCB ground plane, achieving RθJC(bot) = 1.2°C/W and RθJA = 35.2°C/W in HTSSOP-20. The dual-mode VCC regulator supplies 7V (regulated) or tracks VIN (LDO mode below 9V), reducing dissipation in high-input applications while maintaining bias for gate drivers and control circuitry.
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 - enables single-chip point-of-load regulation for FPGA I/O, DSP cores, or ASIC auxiliary rails. |
| Feedback Reference | 1.225V ±1.5% - sets minimum output voltage and defines accuracy of adjustable output (e.g., 3.3V, 5V, 12V). |
| Switch RDS(on) | 170–340mΩ (max) - determines conduction loss and thermal rise at full load; requires proper PCB copper pour under EP. |
| Oscillator Range | 50kHz to 500kHz - allows trade-off between efficiency (lower fSW) and component size (higher fSW); set by single RT resistor. |
| Soft-Start Current | 7–14µA - controls ramp rate of SS capacitor to limit inrush current during power-up and sequencing. |
| Thermal Shutdown | 165°C with 25°C hysteresis - protects against sustained overload or poor heatsinking; automatic recovery after cooldown. |
Pinout & Package
LM25005MH is housed in a thermally enhanced 20-pin HTSSOP (PWP) package measuring 6.5mm × 4.4mm with exposed die attach pad (EP) for direct thermal coupling to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (3,4) | Power Input | Primary high-voltage supply input (7–42V); requires local 10µF ceramic + bulk capacitance near pins. |
| SW (17,18) | Switch Node | Drain of internal N-MOSFET; connects to buck inductor and Schottky diode cathode; high dv/dt node requiring tight layout. |
| BST (20) | Bootstrap Supply | Charges bootstrap capacitor (22nF recommended) during SW low phase to drive high-side gate; must be routed short and low-inductance. |
| PGND (13,14) | Power Ground | Low-side return for MOSFET and IS sense resistor; separate from AGND to avoid noise coupling into control loop. |
| AGND (10) | Analog Ground | Reference for FB, COMP, RAMP, RT; must connect to clean ground plane and tie to PGND at single point near EP. |
| FB (7) | Feedback Input | Inverting input of error amplifier; connected to resistor divider from VOUT; 10nA bias current enables high-impedance dividers. |
| COMP (6) | Error Amp Output | Connects external type-II compensation network (R+C+C) to FB; open-loop stability depends on proper pole/zero placement. |
| RAMP (9) | Emulated Ramp Input | Accepts external capacitor (50pF–2nF) to set slope; slope current varies with (VIN−VOUT) to maintain consistent current-loop gain. |
| RT (8) | Oscillator Set | Single resistor to AGND programs switching frequency; tolerance directly impacts fSW accuracy (±10% typical). |
| SD (2) | Shutdown Control | Three-state logic: <0.7V = shutdown, 0.7–1.225V = standby, >1.225V = active; internal 5µA pull-up enables default-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 42V/160mΩ N-MOSFET | Eliminates external high-voltage switch and associated gate driver, reducing BOM count and layout complexity for 42V-input designs. |
| Emulated current ramp control | Removes need for current-sense resistor or transformer; avoids leading-edge spikes and propagation delay, enabling reliable sub-10% duty cycle operation. |
| Programmable soft-start (SS) | 10µA internal current source charges external capacitor to control output voltage ramp rate, preventing inrush-induced rail collapse or system reset. |
| Oscillator synchronization (SYNC) | Allows multiple LM25005MH units to lock to common clock or self-synchronize-critical for reducing beat frequencies and EMI in multi-rail systems. |
| Dual-mode VCC regulator | Tracks VIN below 9V and regulates to 7V above 9V, minimizing internal power loss and enabling efficient operation across wide input range. |
| Diode current sensing (IS pins 15,16) | Measures freewheeling diode current to reconstruct DC inductor current level-enables accurate cycle-by-cycle current limiting without saturation risk. |
Applications
| Industrial Point-of-Load Regulation | Telecom Power Shelf |
|---|---|
|
Use Scenario: Converting 24V or 48V telecom rack voltage to 3.3V/5V for line card processors and interface ICs. IC Role / Device Role / Timing Role: Primary buck controller managing transient response, efficiency, and thermal performance under dynamic load steps. Use Value: Delivers 2.5A at >90% efficiency (24V→5V) with minimal external components, reducing board area and qualification effort for NEBS-compliant systems. |
Use Scenario: Generating isolated 12V auxiliary rails from 48V backplane in base station RF modules. IC Role / Device Role / Timing Role: High-reliability DC/DC stage providing stable bias for GaN PA drivers and ADC/DAC power domains. Use Value: 42V absolute max rating and thermal shutdown protect against input transients; SYNC pin enables coherent switching with other rails to suppress conducted EMI. |
| Factory Automation I/O Module | High-Voltage Industrial Sensor Hub |
|
Use Scenario: Powering PLC digital I/O channels, analog front-ends, and CAN transceivers from 24V field bus. IC Role / Device Role / Timing Role: Central power manager delivering multiple regulated outputs with sequencing and fault reporting. Use Value: Standby/shutdown modes (via SD pin) support low-power sleep states; wide input range tolerates brownouts and cable drop in harsh environments. |
Use Scenario: Supplying 3.3V to MEMS pressure sensors and signal conditioners mounted directly on hydraulic manifolds (42V nominal). IC Role / Device Role / Timing Role: Robust primary regulator surviving vibration, temperature cycling, and ESD exposure per IEC 61000-4-2. Use Value: Exposed pad HTSSOP package ensures thermal reliability at 125°C junction; ±1.5% FB reference maintains sensor measurement accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5115MHX/NOPB | External MOSFET driver (no integrated FET); supports up to 75V input; requires external high-side/lower FETs. | Better suited for >42V inputs or higher current (>5A) where discrete FETs offer thermal flexibility. | Select LM5115MHX/NOPB when input exceeds 42V or when discrete FET optimization (e.g., SiC, GaN) is required. |
| LM25011MHX/NOPB | Same HTSSOP-20 package and pinout; integrates 42V/100mΩ FET; rated for 1A output (vs. 2.5A). | Limited to lower-current applications (e.g., bias rails, low-power microcontrollers); reduced thermal mass. | Choose LM25011MHX/NOPB only for space-constrained 1A designs where footprint compatibility matters more than current headroom. |
Compared with LM5115MHX/NOPB and LM25011MHX/NOPB, the LM25005MH provides optimal integration for 2.5A, 7–42V applications-balancing FET RDS(on), thermal capability, and feature set without requiring external gate drivers or sacrificing package compatibility.
Availability
LM25005MH is available at Aetrix Electronics and suitable for industrial point-of-load regulation, telecom power shelf design, and factory automation I/O modules requiring stable component supply across extended product lifecycles.
Supply support for LM25005MH 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, industrial, and communications design expertise.
The LM25005MH belongs to TI's high-voltage DC/DC controller family, engineered specifically for robust, high-efficiency buck conversion in industrial and telecom infrastructure where wide input range, thermal resilience, and EMI control are critical.
FAQ
What is the maximum input voltage rating for the LM25005MH?
The LM25005MH has an absolute maximum input voltage rating of 45V across VIN pins (3,4). Its recommended operating range is 7V to 42V. Exceeding 45V-even transiently-can cause permanent damage due to internal oxide breakdown. Layout best practices include placing low-ESR input capacitors within 5mm of VIN/PGND pins and using ferrite beads or TVS diodes for transient suppression in 42V bus applications. The LM25005MH itself does not include overvoltage clamping.
How does the RAMP pin function in the LM25005MH current-mode control architecture?
The RAMP pin in the LM25005MH accepts an external capacitor to generate an emulated current ramp signal used by the PWM comparator. Unlike traditional current-sense methods, this ramp is synthesized from (VIN − VOUT) via an internal current source (136–184µA typical), eliminating noise sensitivity and enabling stable operation at very small duty cycles. The RAMP capacitor value must be selected per CRAMP = L × 10⁻⁵ (L in henrys) to match the 0.5V/A scale factor of the diode-current-derived DC level. This architecture is intrinsic to the LM25005MH's ability to regulate 3.3V from 42V input without instability.
Can the LM25005MH synchronize its switching frequency with other regulators?
Yes, the LM25005MH supports oscillator synchronization via its bidirectional SYNC pin (pin 5). When multiple LM25005MH devices are connected together, the unit with the highest programmed frequency (set by RT resistor) acts as master and forces others to lock to its clock-eliminating beat frequencies and reducing EMI peaks. An external clock can also drive the SYNC pin if its frequency exceeds the free-running oscillator frequency and pulse width exceeds 15ns. This capability is confirmed in the LM25005MH datasheet Section 6.3.2 and Figure 6-4.
What thermal performance can be expected from the LM25005MH in its HTSSOP package?
The LM25005MH in HTSSOP-20 (PWP) achieves RθJC(bot) = 1.2°C/W and RθJA = 35.2°C/W when mounted on a 4-layer PCB with 1-in² 2-oz copper pour connected to the exposed pad (EP). At 2.5A output and 24V input, typical power dissipation is ~1.2W; with proper thermal land pattern and via stitching (≥6× 0.3mm vias to inner ground plane), junction temperature stays below 105°C at 70°C ambient. Thermal shutdown triggers at 165°C with 25°C hysteresis-verified in LM25005MH Electrical Characteristics Table 5.5.
Does the LM25005MH require an external bootstrap capacitor, and what value is recommended?
Yes, the LM25005MH requires an external ceramic bootstrap capacitor between BST (pin 20) and SW (pins 17,18). A 22nF X7R or C0G capacitor is explicitly recommended in the LM25005MH datasheet Section 4 Pin Functions. This capacitor supplies gate drive voltage for the internal high-side MOSFET during its on-time. Placement is critical: the capacitor must be located within 3mm of BST/SW pins with short, wide traces to minimize inductance. Failure to use the correct value or placement causes erratic switching or startup failure-especially at high duty cycles or elevated temperatures.
LM25005MH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM25005MH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM25005MH 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 reliable?
The price and inventory of LM25005MH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM25005MH is usually 5 days.
3.What payment methods are accepted for LM25005MH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM25005MH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM25005MH?
LM25005MH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM25005MH 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?
For technical support, including LM25005MH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM25005MH requirements.
6.How does Aetrix verify that LM25005MH is sourced from the original manufacturer or authorized distributors?
All LM25005MH 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 meets industry standards.
7.What is the process for return or replacement of LM25005MH?
All LM25005MH units undergo pre-shipment inspection (PSI). If there is an issue with LM25005MH, 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 part is unused and in its original packaging.
Return procedure for LM25005MH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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