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Texas Instruments LM5005MH/NOPB
- Part No.:
- LM5005MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5005MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:875
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Product details
Overview
LM5005MH/NOPB from Texas Instruments is a high-voltage, current-mode synchronous buck switching regulator IC integrating a 75V/160mΩ N-channel MOSFET, supporting 7V–75V input and delivering up to 2.5A output current with adjustable VOUT ≥1.225V. It operates across –40°C to 125°C junction temperature and meets EN55022/CISPR 22 EMI standards for telecom and industrial power supplies.
For engineers reviewing the LM5005MH/NOPB datasheet, LM5005MH/NOPB pinout, LM5005MH/NOPB application, or LM5005MH/NOPB equivalent, key selection considerations include its emulated peak current-mode control architecture, 80ns minimum on-time, resistor-programmable 50–500kHz switching frequency, and thermally enhanced HTSSOP-20 package with exposed pad for high-power-density DC-DC conversion.
Technical Context
The LM5005MH/NOPB implements emulated peak current-mode control using a sample-and-hold DC level (derived from IS pin diode current sensing) plus a voltage-controlled ramp generator (IRAMP = 5µA × |VIN − VOUT| + 25µA), eliminating leading-edge spikes and enabling reliable sub-100ns pulse-width control. Its dual-mode VCC bias regulator delivers ~7V regulated output above 9V VIN and tracks VIN below 9V, supporting wide-input operation without external bias winding.
It features programmable soft-start with tracking, monotonic startup into prebiased outputs, cycle-by-cycle overcurrent protection, thermal shutdown with 25°C hysteresis, and oscillator synchronization via open-drain SYNC pin - allowing multi-phase coordination or external clock locking without added timing ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 75V - supports direct connection to unregulated industrial, telecom, or automotive bus rails without pre-regulation. |
| Output Current | Up to 2.5A - sufficient for point-of-load regulation of FPGAs, DSPs, or ASICs in high-density systems. |
| Feedback Reference | 1.225V ±1.5% - enables precise output setting down to 1.225V with standard resistor dividers. |
| Switching Frequency | 50kHz to 500kHz (RT-programmable) - balances efficiency vs. size: lower frequencies improve light-load efficiency; higher frequencies reduce inductor/capacitor footprint. |
| Min On-Time | 80ns - allows stable 5V output from 75V input (6.7% duty cycle), critical for high-VIN-to-low-VOUT conversion. |
| Junction Temp Range | –40°C to 125°C - rated for under-hood automotive, factory automation, or outdoor telecom equipment. |
| EMI Compliance | Meets EN55022 Class B / CISPR 22 - reduces need for external filtering in emissions-sensitive deployments. |
Pinout & Package
LM5005MH/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package (6.50mm × 4.40mm) with an exposed pad soldered to PCB ground for low RθJB = 15.5°C/W junction-to-board thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (3,4) | Main power input | Accepts 7–75V supply; dual pins reduce trace inductance and improve current sharing in high-current paths. |
| SW (17,18) | Switch node | Drives external Schottky diode and buck inductor; connects internally to source of integrated 75V MOSFET. |
| FB (7) | Feedback input | Connects to resistor divider from VOUT; internal 1.225V reference enables accurate output regulation. |
| COMP (6) | Error amplifier output | Interface for type-II compensation network (R/C between COMP and FB) to stabilize control loop. |
| RT (8) | Oscillator set | Resistor to AGND sets switching frequency from 50–500kHz; placement near IC minimizes noise coupling. |
| SYNC (5) | Oscillator sync I/O | Bidirectional pin: self-synchronizes multiple LM5005MH/NOPB or locks to external clock ≥550kHz. |
| SS (11) | Soft-start control | External capacitor with 10µA internal current source controls startup ramp rate and enables output voltage tracking. |
| SD (2) | Shutdown/standby input | Three-state logic: <0.7V = shutdown, 0.7–1.225V = standby (VCC active, no switching), >1.225V = full operation. |
| RAMP (9) | Emulated ramp input | External capacitor (50pF–2nF) sets slope of reconstructed current ramp; eliminates need for current-sense resistor. |
| IS (15,16) | Diode current sense | Connects to freewheeling diode anode; internal sense resistor and sample-and-hold provide DC current level for ramp reconstruction. |
| BST (20) | Bootstrap supply | Connects to SW via 22nF ceramic capacitor; powers high-side gate driver during MOSFET conduction. |
| PRE (19) | Precharge assist | Open-drain output pulsed 250ns before each switch-on to boost BST capacitor charge under light load or prebiased conditions. |
| AGND (10) | Analog ground | Reference for error amplifier, feedback, and ramp circuitry; must be separated from PGND at single-point star ground. |
| PGND (13,14) | Power ground | Low-side return for MOSFET, diode sense resistor, and bootstrap diode; high-current path requiring wide copper pour. |
| VCC (1) | Bias regulator output | 7V regulated supply for internal logic and gate drivers; can accept auxiliary 7.5–14V input to reduce dissipation. |
| OUT (12) | Regulated output | Direct connection to output capacitor; low-ESR ceramic caps recommended for stability and transient response. |
| EP | Exposed pad | Thermal and electrical ground connection; must be soldered to large PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75V/160mΩ MOSFET | Eliminates external high-voltage switch, reducing BOM count and layout complexity while maintaining 2.5A capability. |
| Emulated current-mode control | Reconstructs inductor current without sensing resistor or blanking delay, enabling clean 80ns min-on-time and robust noise immunity. |
| Monotonic start-up into prebiased output | Prevents reverse current flow during hot-plug or system-level power sequencing, protecting downstream loads and capacitors. |
| Configurable soft-start with tracking | External CSS capacitor sets ramp time; tracking function allows coordinated startup with other regulators in multi-rail systems. |
| Thermal shutdown with hysteresis | Triggers at 165°C junction temperature and recovers only after cooling by 25°C, preventing thermal runaway in enclosed environments. |
| Controller synchronization capability | SYNC pin enables deterministic phase alignment of multiple LM5005MH/NOPB in parallel or multi-output designs, reducing input ripple current. |
Applications
| Telecom Point-of-Load | Industrial Control Power |
|---|---|
Use Scenario: Regulating 48V telecom backplane to 3.3V/2.5V for FPGA I/O banks and SERDES transceivers in base station radios. IC Role / Device Role / Timing Role: Primary buck controller providing isolated, low-noise, high-efficiency DC-DC conversion with fast transient response to handle bursty data traffic loads. Use Value: 80ns minimum on-time enables stable 3.3V output from 48V input (6.9% duty cycle); EN55022 compliance avoids costly EMI filter redesign. | Use Scenario: Converting 24V factory automation PLC bus to 5V for microcontroller, analog sensors, and digital I/O modules. IC Role / Device Role / Timing Role: High-reliability step-down regulator operating continuously at –40°C to 85°C ambient with thermal hysteresis protection. Use Value: –40°C to 125°C junction rating ensures operation in uncooled enclosures; integrated MOSFET simplifies design qualification for long-lifecycle industrial programs. |
| Automotive Body Control | High-Voltage LED Driver Supply |
Use Scenario: Deriving 5V/3.3V from 12V–60V automotive battery rail for body control modules (BCM) with cold-crank (6.5V) and load-dump (87V) tolerance. IC Role / Device Role / Timing Role: Input-tolerant buck controller with programmable UVLO hysteresis to maintain operation during cranking and suppress false shutdowns. Use Value: 7V–75V input range covers full automotive transient profile; SD pin hysteresis prevents oscillation during slow VIN ramps. | Use Scenario: Driving constant-current LED strings from 36V–72V industrial lighting bus, where output voltage varies with string count and temperature. IC Role / Device Role / Timing Role: Adjustable-output buck regulator supplying CV stage for external LED current controller ICs. Use Value: Adjustable VOUT ≥1.225V supports wide LED forward voltage range; 50–500kHz frequency tuning optimizes efficiency across dimming profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164MHX/NOPB | 4.5–100V input, 1.5A output, 2.5MHz max frequency, smaller 10-pin WSON package. | Better suited for space-constrained, high-frequency designs where 1.5A suffices and 100V input margin is required. | Select LM5164MHX/NOPB when board area is critical and output current ≤1.5A; LM5005MH/NOPB remains preferred for 2.5A+ or EMI-sensitive 50–500kHz operation. |
| TPS54260DGQR | 3.5–60V input, 2.5A output, integrated 100mΩ MOSFET, but lacks SYNC, PRE, and emulated ramp architecture. | Lower input voltage ceiling and no synchronization support limits use in multi-rail telecom or synchronized LED arrays. | Choose TPS54260DGQR for cost-sensitive 60V-max applications without synchronization needs; LM5005MH/NOPB adds EMI control and advanced timing features. |
Compared with LM5164MHX/NOPB and TPS54260DGQR, LM5005MH/NOPB uniquely combines 75V rating, 2.5A capability, emulated current-mode control for ultra-fast transients, and full synchronization-making it optimal for high-reliability, multi-regulator telecom and industrial systems where EMI, thermal management, and deterministic timing are critical.
Availability
LM5005MH/NOPB is available at Aetrix Electronics and suitable for telecommunications infrastructure, factory automation and control, and high-voltage LED driver power supplies requiring stable component supply across extended product lifecycles.
Supply support for LM5005MH/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 LM5005MH/NOPB belongs to TI's high-voltage DC-DC converter product line, engineered specifically for robust, efficient step-down regulation in harsh-input environments such as telecom rectified buses, industrial 24/48V systems, and automotive 12–60V applications.
FAQ
What is the absolute maximum input voltage rating for LM5005MH/NOPB?
The absolute maximum input voltage (VIN to GND) for LM5005MH/NOPB is 76V, as specified in Section 5.1 of the datasheet. Exceeding this rating-even momentarily during transients-can cause permanent damage. Designers must ensure input bus ringing stays within this limit using proper input capacitance and layout, especially in 75V nominal systems.
Does LM5005MH/NOPB require an external current-sense resistor?
No, LM5005MH/NOPB does not require an external current-sense resistor. It uses an internal diode current sense path (via IS pins) combined with an emulated ramp generator to reconstruct inductor current, eliminating the need for a discrete sense resistor and associated power loss or noise susceptibility.
How is the switching frequency set on LM5005MH/NOPB?
The switching frequency of LM5005MH/NOPB is set by a single external resistor (RT) connected between the RT pin and AGND. Using Equation 1 from the datasheet (RT = 7407/(FSW − 4.3)), a 32.4kΩ resistor yields ~200kHz. Frequency ranges from 50kHz to 500kHz, with tighter tolerance achieved using 1% metal-film resistors placed close to the IC.
Can LM5005MH/NOPB operate with a precharged output?
Yes, LM5005MH/NOPB supports monotonic start-up into prebiased outputs. When enabled, it prevents reverse current flow by controlling gate drive timing and leveraging its emulated current-mode architecture - a critical feature for hot-swap and multi-rail sequencing in telecom and server applications.
What thermal performance can be expected from LM5005MH/NOPB in a standard 2-layer PCB layout?
In a standard 2-layer PCB with the exposed pad fully soldered to a 1-in² copper pour, LM5005MH/NOPB achieves RθJB = 15.5°C/W. At 2.5A output and 48V input, typical power dissipation is ~1.8W; this yields ~28°C rise above ambient, keeping junction temperature well within the 125°C limit even at 85°C ambient.
LM5005MH/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):
- 75V
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- 70V
- 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
LM5005MH/NOPB FAQ
1.How can I place an order for LM5005MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5005MH/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 LM5005MH/NOPB reliable?
The price and inventory of LM5005MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5005MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM5005MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5005MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5005MH/NOPB?
LM5005MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5005MH/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 LM5005MH/NOPB?
For technical support, including LM5005MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5005MH/NOPB requirements.
6.How does Aetrix verify that LM5005MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5005MH/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 LM5005MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM5005MH/NOPB?
All LM5005MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5005MH/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 LM5005MH/NOPB part is unused and in its original packaging.
Return procedure for LM5005MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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