My Inquiry
My Account
Texas Instruments LM5002SD
- Part No.:
- LM5002SD
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM5002SD.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,912
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM5002SD from Texas Instruments is a high-voltage current-mode PWM controller with integrated 75-V/0.5-A N-channel MOSFET, supporting boost, flyback, SEPIC, and forward topologies across 3.1 V to 75 V input. It delivers 1.26 V ±1.5% feedback reference, 85% max duty cycle, and programmable switching frequency up to 1.5 MHz for industrial DC-DC power supplies.
For engineers reviewing the LM5002SD datasheet, LM5002SD pinout, LM5002SD application, or LM5002SD equivalent, key selection criteria include input voltage range compatibility, internal MOSFET RDS(on) (850–1600 mΩ), thermal shutdown threshold (165°C), oscillator synchronization capability, and SOIC-8 package suitability for board-level thermal management in high-reliability converters.
Technical Context
The LM5002SD implements peak current-mode control with integrated slope compensation (450 mV ramp) to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier provides 72 dB DC gain and 3 MHz unity-gain bandwidth, enabling stable Type-II loop compensation between COMP and FB pins.
Functional protection includes cycle-by-cycle current limiting at 0.5 A (±20%), EN pin dual-threshold UVLO (0.45 V shutdown / 1.26 V enable), and thermal shutdown with 20°C hysteresis. The VCC regulator operates from 3.1 V to 75 V input, regulating to 6.9 V above VIN = 6.9 V, with 20 mA current limit and 2.8 V UVLO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1 V to 75 V - supports wide-range industrial and automotive battery inputs without external pre-regulation |
| Feedback Reference Voltage | 1.26 V ±1.5% - enables precise output regulation with minimal external resistor tolerance impact |
| Max Duty Cycle | 85% - allows high step-up ratio in boost/flyback designs while maintaining stability margin |
| Switching Frequency | 50 kHz to 1.5 MHz - set by single RT resistor; higher frequencies reduce magnetics size but increase switching loss |
| MOSFET RDS(on) | 850–1600 mΩ - defines conduction loss at 0.5 A peak current; impacts thermal design in continuous conduction mode |
| Thermal Shutdown | 165°C with 20°C hysteresis - protects die during overload; requires PCB copper area planning per SOIC-8 RθJA = 105.7°C/W |
| Oscillator Sync Input | RT pin accepts external clock > FSW - enables EMI reduction via spread-spectrum or multi-phase synchronization |
Pinout & Package
LM5002SD is housed in an 8-pin SOIC package (4.90 mm × 3.90 mm body) with exposed pad not present - thermal path relies on leads and PCB copper area. Pin functions are validated per TI SNVS496F Rev F (May 2021).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Power switch drain | Connects directly to transformer primary or boost inductor; requires minimized loop area to suppress ringing |
| VIN | Main power input | Accepts 3.1–75 V; must include local 10 µF ceramic + bulk capacitor to handle 76 V abs max transient |
| VCC | Bias supply output/input | Regulated 6.9 V output up to 20 mA; can accept 7–12 V external supply to disable internal LDO and improve efficiency |
| GND | Power and signal reference | Single-point connection point for current sense, FB divider, and decoupling caps; critical for noise immunity |
| RT | Oscillator programming | Resistor-to-GND sets frequency; also accepts AC-coupled sync pulses ≥2.6 V peak with 15 ns min width |
| FB | Feedback input | Connects to resistive divider from output; internal 1.26 V reference enables adjustable output voltage design |
| COMP | Error amplifier output | Open-drain node for Type-II compensation network; internal 5 kΩ pullup enables optocoupler bias in isolated designs |
| EN | Enable/UVLO input | Two-threshold control: <0.45 V = shutdown (95 µA IQ), >1.26 V = full operation; internal 6 µA pullup allows single-resistor UVLO |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 75-V MOSFET | Eliminates external high-voltage switch; reduces BOM count and layout complexity in 48 V+ systems |
| Current-mode control | Provides inherent line feed-forward and simplified loop compensation versus voltage-mode controllers |
| Programmable oscillator | Single RT resistor enables precise frequency setting from 50 kHz to 1.5 MHz without trimming |
| Thermal shutdown with hysteresis | 165°C trip + 20°C recovery prevents thermal cycling damage during sustained overload conditions |
| Isolated feedback support | COMP open-circuit voltage (4.8–6.2 V) and internal 5 kΩ pullup allow direct optocoupler collector drive |
Applications
| Industrial Power Supplies | Automotive DC-DC Converters |
|---|---|
Use Scenario: 24 V/48 V bus-powered PLC I/O modules requiring regulated 5 V/12 V outputs in harsh factory environments. IC Role / Device Role / Timing Role: Primary-side PWM controller implementing flyback topology with internal MOSFET handling 75 V transients. Use Value: 3.1–75 V input range accommodates brownouts and load-dump spikes without external protection circuitry. | Use Scenario: Start-stop system auxiliary power supply converting 9–16 V battery to 5 V for infotainment microcontrollers. IC Role / Device Role / Timing Role: Boost converter controller managing variable input during engine cranking and alternator regulation. Use Value: 85% max duty cycle enables high step-up ratio at low battery voltage while maintaining loop stability. |
| Telecom Remote Radio Units | LED Driver Power Stages |
Use Scenario: Outdoor 48 V PoE-powered remote radio unit needing isolated 3.3 V/5 V rails with EMI compliance. IC Role / Device Role / Timing Role: Flyback controller with synchronized RT pin enabling spread-spectrum operation to meet CISPR-32 Class B limits. Use Value: Oscillator sync capability allows deterministic EMI reduction without sacrificing regulation accuracy. | Use Scenario: High-brightness LED streetlight driver requiring constant-current output from 12–48 V input. IC Role / Device Role / Timing Role: SEPIC topology controller providing buck-boost capability with single inductor and no polarity reversal. Use Value: Integrated slope compensation ensures stable current regulation across full dimming range and temperature. |
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 | External MOSFET driver; wider 3–100 V input; no integrated FET; supports multiphase | Requires external 100 V FET; better suited for >10 A outputs and multi-rail systems | Select when higher output current or multiphase interleaving is required; LM5002SD preferred for compact <5 A designs |
| UCC28C42DR | Lower 12 V max VCC; no integrated FET; fixed 1 MHz oscillator; no sync input | Limited to ≤24 V input systems; requires external HV gate driver and bootstrap circuit | Choose for cost-sensitive, lower-voltage applications where integration level is secondary to BOM cost |
Compared with LM5002SD, LM5122MH offers higher input voltage headroom and multiphase capability but increases component count and layout complexity, while UCC28C42DR reduces integration and thermal performance for simpler, lower-power designs.
Availability
LM5002SD is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC converters, telecom remote radio units, and LED driver power stages requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM5002SD 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM5002SD belongs to TI's high-voltage DC-DC controller product line, designed specifically for efficient, compact non-isolated and isolated power conversion in systems with wide-input-voltage requirements.
FAQ
What is the maximum input voltage rating for the LM5002SD?
The LM5002SD has an absolute maximum input voltage rating of 76 V on the VIN pin. Operation must remain within the recommended 3.1 V to 75 V range. Exceeding 76 V risks permanent damage due to internal junction breakdown, especially during line transients. Proper input filtering and clamping - as shown in Figure 8-1 of the LM5002SD datasheet - are essential in high-voltage applications to protect the device.
Does the LM5002SD support synchronous rectification?
No, the LM5002SD does not support synchronous rectification. It is a controller-only IC with an integrated N-channel MOSFET used as the primary-side switch. Secondary-side rectification must be implemented using external diodes (e.g., Schottky) in flyback or boost configurations. The LM5002SD lacks gate drive outputs or timing control signals required to drive synchronous MOSFETs on the secondary side.
Can the LM5002SD operate without an external RT resistor?
No, the LM5002SD requires an external RT resistor connected between the RT pin and GND to set the oscillator frequency. Even when using external synchronization, the RT resistor remains mandatory to establish the base frequency and provide proper biasing. Omitting it results in undefined switching behavior and failure to initiate regulation. The resistor value determines frequency per Equation 1 in the LM5002SD datasheet (RT = 13.1×10⁹/FSW − 83 ns).
How does the EN pin function in undervoltage lockout (UVLO) mode for the LM5002SD?
The EN pin of the LM5002SD implements dual-threshold UVLO: below 0.45 V disables all circuitry (95 µA quiescent current), between 0.45 V and 1.26 V enables only the VCC regulator (standby), and above 1.26 V fully enables PWM operation. Hysteresis of 100 mV prevents chatter near thresholds. An external resistor divider from VIN to GND - accounting for the internal 6 µA pullup - sets the turn-on voltage, as detailed in Equation 2 and 3 of the LM5002SD datasheet.
What thermal considerations apply to the LM5002SD in SOIC-8 packaging?
The LM5002SD in SOIC-8 has a junction-to-ambient thermal resistance (RθJA) of 105.7°C/W. To maintain TJ ≤ 125°C at maximum load, PCB layout must include ≥2 cm² of 2-oz copper connected to GND pins, short traces for high-current paths (VIN, SW, GND), and adequate airflow. Thermal shutdown activates at 165°C with 20°C hysteresis, so derating and thermal simulation using the LM5002SD's power dissipation model are recommended before final design sign-off.
LM5002SD 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:
- 400mA (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)
LM5002SD FAQ
1.How can I place an order for LM5002SD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5002SD 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 LM5002SD reliable?
The price and inventory of LM5002SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5002SD is usually 5 days.
3.What payment methods are accepted for LM5002SD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5002SD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5002SD?
LM5002SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5002SD 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 LM5002SD?
For technical support, including LM5002SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5002SD requirements.
6.How does Aetrix verify that LM5002SD is sourced from the original manufacturer or authorized distributors?
All LM5002SD 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 LM5002SD meets industry standards.
7.What is the process for return or replacement of LM5002SD?
All LM5002SD units undergo pre-shipment inspection (PSI). If there is an issue with LM5002SD, 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 LM5002SD part is unused and in its original packaging.
Return procedure for LM5002SD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5002SD Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
