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Texas Instruments LM5001SD
- Part No.:
- LM5001SD
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5001SD.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,870
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Product details
Overview
LM5001SD from Texas Instruments is a high-voltage current-mode PWM controller with integrated 75-V/1-A N-channel MOSFET, designed for boost, flyback, SEPIC, and forward converter topologies. It operates from 3.1 V to 75 V input, delivers 1.26 V ±1.5% reference accuracy, supports up to 1.5 MHz switching frequency via RT resistor, and includes cycle-by-cycle current limiting, thermal shutdown, and enable/UVLO functionality - used in industrial DC-DC power supplies requiring wide-input-range regulation.
For engineers reviewing the LM5001SD datasheet, LM5001SD pinout, LM5001SD application, or LM5001SD equivalent, key selection considerations include its 75-V internal MOSFET RDS(on) (490–800 mΩ), adjustable 50 kHz–1.5 MHz oscillator, 85% max duty cycle limit, integrated slope compensation, and dual-threshold EN pin enabling programmable UVLO and remote shutdown.
Technical Context
The LM5001SD implements peak current-mode control with internal 50 mΩ current-sense resistor amplified 30× to generate a 1.5 V/A signal for cycle-by-cycle limiting at 1 A. Slope compensation adds a fixed 450 mV ramp to prevent sub-harmonic oscillation above 50% duty cycle. The error amplifier provides 72 dB DC gain and 3 MHz unity-gain bandwidth, supporting Type II compensation networks connected between COMP and FB pins.
Its high-voltage VCC LDO regulator tracks VIN up to 6.9 V, then clamps at 6.9 V (±3%), delivering up to 20 mA. The EN pin features dual thresholds: 0.45 V shutdown and 1.26 V enable, each with 100 mV hysteresis. An internal 6 µA pull-up enables default operation when EN is open, while external voltage dividers allow precise input UVLO programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 75 V - supports direct connection to 48 V telecom, 24 V industrial, and battery-backed systems without pre-regulation. |
| Internal MOSFET | 75-V N-channel, 490–800 mΩ RDS(on) - eliminates external high-voltage switch, reduces BOM count and layout complexity. |
| Switching Frequency | 50 kHz to 1.5 MHz - set by single RT resistor; enables compact magnetics and EMI optimization via synchronization. |
| Reference Voltage | 1.260 V ±1.5% - high-accuracy feedback reference ensures stable output regulation across temperature and load. |
| Current Limit | 0.8–1.2 A cycle-by-cycle - protects MOSFET and inductor during overload or short-circuit conditions. |
| Max Duty Cycle | 80–90% - configurable via external components; supports high step-up ratios in boost/flyback designs. |
| Thermal Shutdown | 165°C with 20°C hysteresis - prevents permanent damage during sustained overloads or poor heatsinking. |
Pinout & Package
LM5001SD is packaged in an 8-pin SOIC (D) package measuring 4.9 mm × 3.91 mm, with exposed pad not present (WSON variant has EP; SOIC does not). Pin functions are validated per TI SNVS484H datasheet Rev H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Power MOSFET drain node | High dv/dt switching node; requires minimized loop area with GND to reduce EMI and voltage spikes. |
| 2 VIN | Main input supply | Accepts 3.1–75 V; powers internal circuitry and MOSFET gate driver; must be bypassed with ≥0.47 µF ceramic capacitor. |
| 3 VCC | Bias supply output/input | Internally regulated to 6.9 V (up to 20 mA); can accept external 7–12 V supply to improve efficiency at high VIN. |
| 4 GND | Analog/digital ground reference | Common return for current sense, error amplifier, and MOSFET source; must connect to low-impedance PCB ground plane. |
| 5 RT | Oscillator timing/sync input | Resistor-to-GND sets frequency; accepts external sync pulses >2.6 V peak, ≥15 ns width, coupled via 100 pF capacitor. |
| 6 FB | Feedback input | Connects to resistive divider from output; referenced to internal 1.26 V precision bandgap; bias current ≤10 nA. |
| 7 COMP | Error amplifier output | Open-drain output with 5 kΩ internal pull-up; connects to compensation network and opto-coupler in isolated designs. |
| 8 EN | Enable/UVLO input | 0.45 V shutdown / 1.26 V enable thresholds; internal 6 µA pull-up allows default-on operation; supports remote control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75-V/1-A MOSFET | Reduces external component count and PCB footprint; eliminates gate driver design effort and layout sensitivity. |
| Adjustable 50 kHz–1.5 MHz oscillator | Enables optimization of size vs. efficiency trade-offs; synchronization capability avoids beat frequencies in multi-rail systems. |
| 1.26 V ±1.5% internal reference | Ensures tight output voltage tolerance without external precision references; minimizes drift over –40°C to +125°C. |
| Programmable EN/UVLO thresholds | Allows custom input voltage turn-on/turn-off points using two resistors; hysteresis prevents chatter near threshold. |
| Integrated slope compensation | Eliminates need for external ramp generator; stabilizes current-mode control at duty cycles >50% in boost/flyback. |
| Thermal shutdown with hysteresis | Protects device under sustained overload or inadequate cooling; automatic recovery after die cools by ~20°C. |
Applications
| Industrial 48 V DC-DC Supply | Automotive LED Driver |
|---|---|
|
Use Scenario: Regulating unregulated 36–72 V battery or bus voltage to stable 12 V or 24 V for PLC I/O modules and sensors. IC Role / Device Role / Timing Role: Primary PWM controller implementing flyback topology with primary-side regulation; manages MOSFET switching, current sensing, and feedback loop stability. Use Value: Wide 3.1–75 V input range accommodates automotive transients and industrial brownouts; integrated MOSFET simplifies compliance with IEC 61000-4-5 surge immunity requirements. |
Use Scenario: Driving high-brightness LEDs from 12 V or 24 V vehicle battery with constant-current output and dimming interface. IC Role / Device Role / Timing Role: Boost controller operating in continuous conduction mode; regulates LED string current via FB pin feedback and COMP loop compensation. Use Value: 1.5% reference accuracy ensures consistent LED brightness across temperature; EN pin enables PWM dimming or ignition-controlled on/off sequencing. |
| Telecom AC-DC Adapter | Isolated Medical Power Module |
|
Use Scenario: Secondary-side regulated offline flyback converter delivering 5 V/3 A from rectified 375 V DC bus in telecom rectifiers. IC Role / Device Role / Timing Role: Primary-side controller with opto-coupler feedback; COMP drives opto-LED while FB is grounded; uses VCC winding for self-bias. Use Value: Integrated VCC LDO enables startup from high VIN; slope compensation ensures stable operation at high duty cycles required for high step-down ratios. |
Use Scenario: Reinforced-isolation 5 V/1 A auxiliary supply for patient-connected monitoring equipment meeting IEC 60601-1 creepage/clearance requirements. IC Role / Device Role / Timing Role: Flyback controller with transformer-isolated feedback; EN pin tied to system watchdog for fail-safe shutdown. Use Value: Thermal shutdown and cycle-by-cycle current limiting provide dual-layer protection critical for safety-critical applications; AEC-Q100 qualification indicates robust process and qualification rigor. |
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 |
|---|---|---|---|
| LM5002SD | Higher 100-V MOSFET rating; identical pinout and feature set; 1.2 A current limit. | Required for input voltages exceeding 75 V (e.g., 96 V battery systems); same PCB layout but higher voltage derating needed. | Select LM5002SD when input transient margin exceeds 75 V or long-term reliability at >70 V is critical. |
| UCC28C42DR | External MOSFET driver only; no integrated FET; 30 V max VDD; requires external HV bias supply. | Suitable for designs needing >1 A output or discrete MOSFET optimization (e.g., GaN/SiC); lacks integrated current sense. | Choose UCC28C42DR when higher power, custom switching characteristics, or lower RDS(on) than 490 mΩ is required. |
Compared with LM5001SD, LM5002SD extends input voltage headroom while maintaining full compatibility, whereas UCC28C42DR trades integration for flexibility and higher current capability - making LM5001SD optimal for cost-sensitive, medium-power (<25 W), wide-input industrial converters where BOM reduction is prioritized.
Availability
LM5001SD is available at Aetrix Electronics and suitable for industrial DC-DC power supplies, automotive LED drivers, and telecom AC-DC adapters requiring stable component supply, long-lifecycle support, and AEC-Q100 qualified assurance.
Supply support for LM5001SD 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 LM5001SD belongs to TI's high-voltage DC-DC controller product line, engineered for rugged industrial, automotive, and telecom power systems demanding wide input range, integrated protection, and minimal external components.
FAQ
What is the maximum input voltage rating for the LM5001SD?
The LM5001SD has an absolute maximum VIN rating of 76 V, with recommended operating range from 3.1 V to 75 V. Exceeding 75 V risks violating safe operating area limits, especially during line transients. Proper input filtering and layout - including low-inductance VIN/GND decoupling with ≥0.47 µF ceramic capacitors - are essential to prevent damage. The LM5001SD datasheet specifies that voltage ringing on VIN must remain below 76 V to avoid permanent failure.
Does the LM5001SD support external clock synchronization?
Yes, the LM5001SD supports external oscillator synchronization via the RT pin. A rising-edge sync pulse >2.6 V peak and ≥15 ns wide, capacitively coupled through a 100 pF capacitor, will lock the internal oscillator. The RT resistor remains mandatory whether free-running or synchronized. The LM5001SD's sync capability enables noise reduction in multi-converter systems and avoids beat frequencies - critical in tightly spaced power modules where EMI compliance is stringent.
How is the output voltage adjusted using the LM5001SD?
The LM5001SD uses resistive feedback from the regulated output to the FB pin, referenced to its internal 1.26 V precision bandgap. Output voltage is set by VOUT = 1.26 V × (1 + R1/R2), where R1 connects from output to FB and R2 from FB to GND. The LM5001SD's FB bias current is ≤10 nA, minimizing divider error. For isolated designs, FB is grounded and COMP is driven by an opto-coupler - enabling secondary-side regulation without compromising primary-side stability.
What protection features are built into the LM5001SD?
The LM5001SD integrates cycle-by-cycle current limiting (0.8–1.2 A), thermal shutdown at 165°C with 20°C hysteresis, undervoltage lockout on both VIN and EN pins, and leading-edge blanking to suppress MOSFET turn-on current spikes. These protections operate autonomously without external components. During current limit activation, the LM5001SD immediately disables the SW pin; thermal shutdown forces standby mode while preserving VCC regulation - allowing graceful recovery once conditions normalize.
Can the LM5001SD be used in flyback configurations with primary-side regulation?
Yes, the LM5001SD is commonly deployed in primary-side regulated flyback converters using auxiliary winding feedback. In this configuration, the VCC winding supplies bias after startup, and the FB pin connects to a Zener-based sampling circuit reflecting output voltage. The LM5001SD's high-accuracy 1.26 V reference and wide input range enable stable regulation across line and load without opto-couplers - reducing cost and improving reliability. TI provides reference designs (e.g., TIDA-00239) validating this approach for <25 W applications.
LM5001SD 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)
LM5001SD FAQ
1.How can I place an order for LM5001SD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5001SD 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 LM5001SD reliable?
The price and inventory of LM5001SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5001SD is usually 5 days.
3.What payment methods are accepted for LM5001SD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5001SD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5001SD?
LM5001SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5001SD 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 LM5001SD?
For technical support, including LM5001SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5001SD requirements.
6.How does Aetrix verify that LM5001SD is sourced from the original manufacturer or authorized distributors?
All LM5001SD 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 LM5001SD meets industry standards.
7.What is the process for return or replacement of LM5001SD?
All LM5001SD units undergo pre-shipment inspection (PSI). If there is an issue with LM5001SD, 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 LM5001SD part is unused and in its original packaging.
Return procedure for LM5001SD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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