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Texas Instruments LM5001SDX
- Part No.:
- LM5001SDX
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5001SDX.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,523
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Product details
Overview
LM5001SDX from Texas Instruments is a high-voltage current-mode PWM controller IC integrating a 75-V, 1-A peak-rated N-channel MOSFET for Boost, Flyback, SEPIC, and Forward converter topologies. It operates from 3.1 V to 75 V input, delivers 1.26 V ±1.5% internal reference, supports up to 1.5 MHz switching via RT resistor, and includes cycle-by-cycle current limiting and thermal shutdown at 165°C - used in industrial DC-DC power supplies requiring wide VIN range and compact high-voltage regulation.
For engineers reviewing the LM5001SDX datasheet, LM5001SDX pinout, LM5001SDX application, or LM5001SDX equivalent, key selection criteria include its integrated 75-V MOSFET RDS(on) (490–800 mΩ), adjustable frequency (50 kHz–1.5 MHz), 85% max duty cycle, EN/UVLO dual-threshold control (0.45 V / 1.26 V), and COMP-based loop compensation for stable isolated or non-isolated designs.
Technical Context
The LM5001SDX implements peak current-mode control with internal slope compensation (450 mV ramp) to prevent sub-harmonic oscillation above 50% duty cycle. Its oscillator uses a single RT-to-GND resistor or accepts external synchronization pulses (>2.6 V threshold, ≥15 ns width) while maintaining internal 1.5 V DC bias on RT.
It integrates a high-voltage VCC LDO regulator (6.55–7.15 V output, 20 mA limit) that tracks VIN up to 6.9 V then regulates; an enable circuit with three states (shutdown at VEN < 0.45 V, standby at 0.45–1.26 V, full operation above 1.26 V); and a 5-kΩ pull-up on COMP for opto-coupler interfacing in isolated flyback designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 75 V - enables direct regulation from 12 V, 24 V, 48 V, or PoE++/industrial bus rails without pre-regulation. |
| Integrated MOSFET | 75-V N-channel, 490–800 mΩ RDS(on), 1-A peak current limit - eliminates external high-voltage switch and reduces BOM count. |
| Feedback Reference | 1.241–1.279 V (±1.5%) - ensures tight output voltage accuracy across –40°C to +125°C for stable regulation. |
| Switching Frequency | 50 kHz to 1.5 MHz (RT-programmable) - allows optimization of magnetics size vs. efficiency and EMI performance. |
| Max Duty Cycle | 80–90% - supports high step-up ratios in boost/flyback while maintaining minimum off-time for reliable current sensing. |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects die during overload or poor heatsinking; VCC remains active in shutdown for controlled recovery. |
| EN Pin Thresholds | 0.25–0.65 V (shutdown), 1.2–1.32 V (standby enable) - enables precise UVLO programming and remote control via open-drain devices. |
Pinout & Package
LM5001SDX is packaged in SOIC-8 (4.9 mm × 3.91 mm) with exposed pad (EP) connected to GND for thermal enhancement. Pin functions are validated per TI SNVS484H datasheet Rev H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power MOSFET drain node | High-slew, high-voltage switching node - requires minimized trace length and loop area to reduce EMI and ringing. |
| 2 VIN | Main input supply | Accepts 3.1–75 V; powers internal circuits and MOSFET gate drive; must be decoupled near pin with ≥0.47 µF ceramic capacitor. |
| 3 VCC | Bias regulator output/input | Internally regulated to 6.9 V (max); can accept external 7–12 V supply to bypass internal LDO and improve efficiency at high VIN. |
| 4 GND | Analog/digital/power ground | Reference for FB, COMP, RT, EN; return path for MOSFET current sense; must connect to low-impedance PCB ground plane. |
| 5 RT | Oscillator timing/sync input | Resistor sets frequency (50 kHz–1.5 MHz); also accepts sync pulses >2.6 V (≥15 ns) - internal 1.5 V DC bias maintained. |
| 6 FB | Error amplifier inverting input | Compares output voltage (via resistive divider) against 1.26 V reference; 10 nA bias current enables high-impedance feedback networks. |
| 7 COMP | Error amplifier output | Open-drain output with 5-kΩ internal pull-up; drives external compensation network or opto-coupler LED in isolated topologies. |
| 8 EN | Enable/UVLO/shutdown control | Three-state logic: <0.45 V = shutdown (95 µA IQ), 0.45–1.26 V = standby (VCC active), >1.26 V = full operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75-V MOSFET | Reduces component count and layout complexity in high-input-voltage DC-DC converters - no external HV FET required. |
| Current-mode control with slope compensation | Enables stable operation at >50% duty cycle without sub-harmonic oscillation - critical for high-step-up flyback/boost designs. |
| Dual-threshold EN pin | Supports programmable UVLO and remote shutdown/standby using simple resistor dividers or open-drain logic - improves system-level power sequencing. |
| VCC LDO with external bias option | Allows auxiliary winding or external supply (7–12 V) to disable internal regulator - cuts quiescent loss and boosts efficiency at VIN > 24 V. |
| Internal 1.26 V precision reference | Provides ±1.5% output voltage accuracy over temperature - eliminates need for external reference in most applications. |
| Oscillator synchronization | Enables EMI reduction by locking switching frequency to system clock - avoids beat frequencies and simplifies filtering. |
Applications
| Industrial 48 V DC Power Supply | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Regulating 48 V battery or bus to 5 V/3.3 V for microcontrollers, sensors, and CAN transceivers in harsh environments. IC Role / Device Role / Timing Role: Primary PWM controller in non-isolated buck-derived or flyback topology; provides robust start-up, current limiting, and thermal protection. Use Value: Wide 3.1–75 V input range accommodates cold-crank (≈6 V) to load-dump (≈60 V) transients without external pre-regulator. |
Use Scenario: Generating isolated 12 V or 5 V from vehicle battery (9–16 V nominal, up to 40 V transient) for infotainment or ADAS subsystems. IC Role / Device Role / Timing Role: Flyback controller with opto-coupler feedback; COMP drives opto-LED while FB is grounded on primary side. Use Value: Integrated slope compensation and 85% max duty cycle ensure stable regulation across wide line/load variations and temperature. |
| Telecom PoE++ Midspan Power | Industrial IoT Sensor Node Power |
|
Use Scenario: Providing 57 V output from 54 V input in IEEE 802.3bt midspan PSE equipment, powering remote PDs over Ethernet. IC Role / Device Role / Timing Role: Boost controller with precise current limit and fast transient response; RT pin synchronized to system clock for EMI compliance. Use Value: 75-V MOSFET and 1-A peak current rating support high-efficiency boost conversion at >90% duty cycle without external components. |
Use Scenario: Step-up converter for energy harvesting (e.g., solar, vibration) to charge Li-ion or supercapacitors from low-voltage sources (3–12 V). IC Role / Device Role / Timing Role: SEPIC controller enabling bidirectional input/output capability and seamless transition between source and storage. Use Value: Ultra-low shutdown current (95 µA) and programmable EN thresholds extend battery life in intermittent-operation sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5122MH/NOPB | Wider 3–100 V input, dual-phase capable, no integrated MOSFET - requires external 100-V FET. | Used in higher-power (>100 W) synchronous boost or two-phase interleaved designs where layout control and efficiency are prioritized. | Select when needing >75 V input, higher output power, or synchronous rectification - LM5001SDX is simpler for ≤30 W single-FET designs. |
| UCC28C43DR | 3–30 V input only, no integrated MOSFET, lower 1-A current limit, no slope compensation - requires external compensation. | Suitable for cost-sensitive, lower-voltage industrial supplies where input stays below 24 V and external FET is acceptable. | Choose for sub-30 V systems with tight BOM cost targets; LM5001SDX is mandatory for 48 V+ inputs or integrated-FET simplicity. |
Compared with LM5122MH/NOPB and UCC28C43DR, the LM5001SDX uniquely combines 75-V integrated MOSFET, wide 3.1–75 V operation, and built-in slope compensation - making it optimal for compact, high-input-voltage, medium-power converters where integration and reliability outweigh multi-phase or ultra-low-cost requirements.
Availability
LM5001SDX is available at Aetrix Electronics and suitable for industrial DC-DC power supplies, automotive body electronics, and telecom midspan equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant variants (LM5001-Q1).
Supply support for LM5001SDX 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and automotive-grade qualification.
The LM5001SDX belongs to TI's high-voltage DC-DC controller product line, designed specifically for rugged, wide-input-voltage power conversion in industrial, automotive, and communications infrastructure - emphasizing integration, thermal robustness, and ease of use.
FAQ
What is the maximum input voltage rating for the LM5001SDX?
The LM5001SDX has an absolute maximum VIN rating of 76 V, with recommended operating range from 3.1 V to 75 V. Exceeding 76 V risks permanent damage due to internal junction breakdown. Input transients must be clamped externally - especially critical in 48 V systems experiencing load dump - using TVS diodes and proper PCB layout near the VIN and GND pins.
Does the LM5001SDX support external clock synchronization?
Yes, the LM5001SDX supports external oscillator synchronization via the RT pin. A rising-edge sync pulse >2.6 V with ≥15 ns width and frequency higher than the free-running oscillator will lock the internal clock. The RT pin maintains a 1.5 V DC bias, so coupling requires a 100 pF capacitor; the external resistor (RRT) must remain connected regardless of sync mode.
How does the EN pin function in shutdown and standby modes for the LM5001SDX?
The LM5001SDX EN pin implements three distinct states: below 0.45 V disables all circuitry (95 µA shutdown current), 0.45–1.26 V enables VCC regulation only (standby), and above 1.26 V enables full operation. Hysteresis (100 mV) prevents noise-induced toggling. An internal 6 µA pull-up allows default-enable behavior when left floating.
Can the LM5001SDX be used in isolated flyback designs?
Yes, the LM5001SDX is commonly used in isolated flyback converters. In such configurations, the FB pin is grounded on the primary side, and the COMP pin drives the LED of an opto-coupler referenced to secondary-side error amplification. The 5-kΩ internal pull-up on COMP eliminates need for external bias, simplifying isolated feedback implementation.
What is the purpose of slope compensation in the LM5001SDX?
Slope compensation in the LM5001SDX adds a 450 mV triangular ramp to the current sense signal before comparison with the COMP voltage. This prevents sub-harmonic oscillation in peak current-mode control when duty cycle exceeds 50%, ensuring stable regulation in high-step-up flyback or boost topologies without requiring complex external compensation.
LM5001SDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Boost, Flyback, Forward Converter, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- 76V (Switch)
- Current - Output:
- 800mA (Switch)
- Frequency - Switching:
- 50kHz ~ 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (4x4)
LM5001SDX FAQ
1.How can I place an order for LM5001SDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5001SDX 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 LM5001SDX reliable?
The price and inventory of LM5001SDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5001SDX is usually 5 days.
3.What payment methods are accepted for LM5001SDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5001SDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5001SDX?
LM5001SDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5001SDX 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 LM5001SDX?
For technical support, including LM5001SDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5001SDX requirements.
6.How does Aetrix verify that LM5001SDX is sourced from the original manufacturer or authorized distributors?
All LM5001SDX 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 LM5001SDX meets industry standards.
7.What is the process for return or replacement of LM5001SDX?
All LM5001SDX units undergo pre-shipment inspection (PSI). If there is an issue with LM5001SDX, 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 LM5001SDX part is unused and in its original packaging.
Return procedure for LM5001SDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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