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Texas Instruments LM5005MHX/NOPB
- Part No.:
- LM5005MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5005MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,859
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Product details
Overview
LM5005MHX/NOPB from Texas Instruments is a high-voltage, synchronous step-down DC-DC switching regulator integrating a 75V/160mΩ N-channel buck MOSFET, delivering up to 2.5A output current with input voltage range 7V–75V and adjustable output as low as 1.225V. It employs emulated peak current-mode control for fast transient response and operates in thermally enhanced 20-pin HTSSOP package with exposed pad - widely used in telecom power supplies and industrial bus converters.
For engineers reviewing the LM5005MHX/NOPB datasheet, LM5005MHX/NOPB pinout, LM5005MHX/NOPB application, or LM5005MHX/NOPB equivalent, key selection considerations include its wide VIN range, integrated high-voltage switch, programmable 50–500kHz switching frequency, EMI-compliant operation per CISPR 22, and monotonic start-up into prebiased outputs.
Technical Context
The LM5005MHX/NOPB implements emulated peak current-mode control using a sample-and-hold DC level derived from freewheeling diode current (via IS pins) and an externally set voltage ramp (RAMP pin + CRAMP capacitor), eliminating noise-sensitive current sensing while enabling reliable <80ns minimum on-time. Its dual-mode VCC bias regulator autonomously tracks VIN ≤9V or regulates to ~7V for VIN >9V, supporting direct connection to 75V bus without external bias supply.
Protection architecture includes cycle-by-cycle overcurrent detection via internal sense resistor (42mΩ DSENSE), thermal shutdown at 165°C with 25°C hysteresis, VCC and gate-drive UVLO, and precision shutdown/standby thresholds (0.7V shutdown, 1.225V enable) with 0.1V hysteresis - all implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 75V - supports direct interface to industrial 24V/48V/60V buses and telecom -48V return-referenced systems. |
| Max Output Current | 2.5A - sustained delivery enabled by integrated 75V/160mΩ MOSFET and low RθJB = 15.5°C/W thermal path. |
| Feedback Reference | 1.225V ±1.5% - sets precise output regulation point; enables adjustable VOUT ≥1.225V using standard resistor dividers. |
| Switching Frequency | 50kHz to 500kHz - resistor-programmable (RT pin); allows optimization of size, efficiency, and EMI performance. |
| Min PWM On-Time | 80ns - enables stable regulation at high VIN/VOUT ratios (e.g., 75V→3.3V) without pulse skipping. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and extended-temperature embedded power applications. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B - achieved via synchronized switching, controlled slew rates, and layout-optimized HTSSOP package. |
Pinout & Package
LM5005MHX/NOPB is housed in a thermally enhanced 20-pin HTSSOP (PWP) package (6.50mm × 4.40mm) with exposed pad soldered to PCB ground plane for low junction-to-board thermal impedance (RθJB = 15.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (3,4) | High-voltage input supply | Accepts 7V–75V unregulated input; dual pins reduce trace inductance and improve current sharing. |
| SW (17,18) | Switching node | Drain connection of internal buck MOSFET; connects to inductor and external Schottky diode cathode. |
| PGND (13,14) | Power ground | Low-side reference for MOSFET source, IS sense resistor, and bootstrap circuit; separate from AGND for noise isolation. |
| FB (7) | Feedback input | Connects to resistor divider from VOUT; internal 1.225V reference compares against this node to regulate output. |
| COMP (6) | Error amplifier output | Provides access to control loop compensation network (type-II recommended between COMP and FB). |
| RT (8) | Oscillator frequency set | Resistor to AGND programs switching frequency from 50kHz to 500kHz per RT = 7407/(FSW − 4.3) kΩ. |
| SYNC (5) | Oscillator sync I/O | Enables master-slave synchronization of multiple LM5005MHX/NOPB units or external clock locking; open-drain compatible. |
| SD (2) | Shutdown/standby control | 0.7V threshold disables switching (shutdown), 1.225V enables operation; internal 5µA pullup allows default-on configuration. |
| SS (11) | Soft-start timing | External capacitor with internal 10µA current source controls output voltage ramp rate; holds low during fault conditions. |
| BST (20) | Bootstrap supply | Connects external 22nF ceramic capacitor to SW; powers high-side gate driver during MOSFET on-time. |
| PRE (19) | Precharge assist | Open-drain output tied to SW; injects charge into BST capacitor during light-load or prebiased start-up. |
| RAMP (9) | Emulated current ramp | External capacitor to AGND sets slope of reconstructed current signal; eliminates leading-edge spikes and blanking delays. |
| IS (15,16) | Diode current sense | Connects to anode of freewheeling Schottky; internal 42mΩ sense resistor enables accurate DC-level sampling for ramp generation. |
| VCC (1) | Bias regulator output | Internally regulated ~7V for VIN >9V; tracks VIN for VIN ≤9V; requires 0.1–1µF ceramic decoupling capacitor. |
| AGND (10) | Analog ground | Reference for error amplifier, feedback comparator, and internal references; must be star-connected to PGND at single point. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75V/160mΩ buck switch | Eliminates external high-voltage MOSFET and associated gate drive complexity; reduces BOM count and layout area. |
| Emulated peak current-mode control | Replaces noisy, spike-prone current-sense signals with clean, delay-free ramp generation - enabling stable 80ns min on-time. |
| Monotonic start-up into prebiased output | Prevents reverse current flow and output overshoot when enabling into existing VOUT; critical for hot-swap and redundant systems. |
| Configurable soft-start with tracking | SS pin supports external capacitor ramp and optional tracking of another supply; prevents inrush current and sequencing issues. |
| Controller synchronization capability | SYNC pin enables deterministic phase alignment across multiple LM5005MHX/NOPB regulators - reducing input ripple and EMI peaks. |
| Thermally enhanced HTSSOP with exposed pad | Exposed pad soldered to PCB ground achieves RθJB = 15.5°C/W - enabling 2.5A continuous output without heatsink in 1-in² layout. |
Applications
| Telecom Power Supply | Industrial Bus Converter |
|---|---|
|
Use Scenario: Step-down conversion from –48V telecom battery bus to isolated 5V/3.3V logic rails in base station line cards. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing point-of-load power with tight line/load regulation and fast transient recovery. Use Value: 75V absolute max rating accommodates –48V nominal with surge tolerance; 2.5A output supports multi-core DSP/FPGA loads. |
Use Scenario: Converting 24V/48V factory automation bus to 12V actuator or sensor interface rails in PLC modules. IC Role / Device Role / Timing Role: High-efficiency, rugged DC-DC stage operating continuously in harsh temperature environments (–40°C to +85°C ambient). Use Value: Wide input range eliminates need for intermediate 12V bus; thermal shutdown with hysteresis ensures safe derating under overload. |
| Automotive ECU Power | Test Equipment Power Module |
|
Use Scenario: Regulating 12V/24V vehicle battery (with load dump protection) to stable 5V for microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Input-stage buck converter handling cold-crank (6.5V) to load-dump (75V) transients without latch-up. Use Value: 7V–75V operating range covers full automotive voltage envelope; programmable UVLO on SD pin enables custom brown-out response. |
Use Scenario: Programmable bench power supply channel delivering 1.225–30V at up to 2.5A with remote enable and monitoring. IC Role / Device Role / Timing Role: Core regulation element in digitally controlled lab supply, leveraging SYNC for multi-rail coherence and SS for smooth voltage ramps. Use Value: Adjustable VOUT down to 1.225V and 50–500kHz frequency tuning support flexible output resolution and noise filtering. |
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 | 4.5V–100V input, 1.5A output, integrated 100V/300mΩ FET; uses constant-on-time control instead of emulated current mode. | Lacks monotonic start-up and prebias support; lower current rating limits use in high-power PoL. | Select when wider input range (100V) is required and 1.5A suffices; avoid where fast load transients or precharged outputs dominate. |
| TPS54260DGQR | 3.5V–60V input, 2.5A output, integrated 60V/240mΩ FET; uses current-mode control with physical current sense. | Requires external RC snubber for EMI compliance; no SYNC pin; max VIN 60V excludes 75V bus applications. | Choose for cost-sensitive 60V-max designs where TI's WEBENCH® support and footprint compatibility matter more than 75V margin. |
Compared with LM5005MHX/NOPB, LM5164MHX/NOPB extends input range but sacrifices current capability and prebias robustness, while TPS54260DGQR offers identical output current but lacks 75V rating and EMI-certified operation - making LM5005MHX/NOPB the only option meeting full CISPR 22 compliance at 75V input.
Availability
LM5005MHX/NOPB is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive ECU power supplies requiring stable component supply across extended temperature and high-input-voltage conditions.
Supply support for LM5005MHX/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM5005MHX/NOPB belongs to TI's high-voltage DC-DC regulator product line, engineered specifically for robust, low-component-count buck conversion in 24V–75V industrial and telecom power systems.
FAQ
What is the minimum input voltage supported by the LM5005MHX/NOPB?
The LM5005MHX/NOPB supports a minimum input voltage of 7V, verified across –40°C to +125°C junction temperature range per TI's SNVS397F datasheet Section 5.3. Below 7V, the internal VCC regulator cannot sustain bias, causing UVLO shutdown. This makes LM5005MHX/NOPB unsuitable for 5V or 3.3V input systems but ideal for 12V+ industrial and telecom buses.
Does the LM5005MHX/NOPB require an external bootstrap capacitor?
Yes, the LM5005MHX/NOPB requires an external 22nF ceramic capacitor between BST and SW pins, as specified in Pin Function Table 4-1 and Figure 4-1. This capacitor supplies gate drive energy for the internal high-side MOSFET during on-time. Omitting it causes immediate failure of the buck switch; placement must be within 3mm of the BST/SW pins per Layout Guidelines in Section 7.4.
Can the LM5005MHX/NOPB operate with a 75V input continuously?
Yes, the LM5005MHX/NOPB is rated for continuous operation at 75V input, confirmed by Absolute Maximum Rating (VIN to GND = 76V) and Recommended Operating Conditions (VIN max = 75V) in Sections 5.1 and 5.3 of the datasheet. Thermal design must ensure junction temperature remains ≤125°C - achievable using the exposed pad and proper copper area per RθJB = 15.5°C/W.
How does the LM5005MHX/NOPB achieve EMI compliance per CISPR 22?
The LM5005MHX/NOPB meets CISPR 22 Class B through integrated features: oscillator synchronization (SYNC pin) for deterministic spectral spreading, controlled gate drive slew rates, and optimized internal routing in the HTSSOP package. TI's typical application circuit (Figure 7-1) with recommended input filter (CIN1/CIN2), output LC filter, and layout guidelines (Section 7.4) is required to replicate certified performance.
Is the LM5005MHX/NOPB pin-compatible with other members of the LM50xx family?
No, the LM5005MHX/NOPB is not pin-compatible with other LM50xx devices such as LM5002 or LM5007. Its 20-pin HTSSOP layout, dual VIN/SW/PGND pins, and unique pin functions (e.g., IS, PRE, RAMP) differ significantly. Substitution requires full schematic and layout revision; only LM5005 variants (e.g., LM5005MHE/NOPB in HTSSOP-20 with different temp grade) share identical pinout.
LM5005MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM5005MHX/NOPB FAQ
1.How can I place an order for LM5005MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5005MHX/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 LM5005MHX/NOPB reliable?
The price and inventory of LM5005MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5005MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM5005MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5005MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5005MHX/NOPB?
LM5005MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5005MHX/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 LM5005MHX/NOPB?
For technical support, including LM5005MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5005MHX/NOPB requirements.
6.How does Aetrix verify that LM5005MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5005MHX/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 LM5005MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM5005MHX/NOPB?
All LM5005MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5005MHX/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 LM5005MHX/NOPB part is unused and in its original packaging.
Return procedure for LM5005MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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